Servomex Group Limited

United Kingdom

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IPC Class
G01N 21/39 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers 9
G01N 21/3504 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis 8
G01J 3/02 - SpectrometrySpectrophotometryMonochromatorsMeasuring colours Details 3
G01J 3/42 - Absorption spectrometryDouble-beam spectrometryFlicker spectrometryReflection spectrometry 3
G01J 3/433 - Modulation spectrometryDerivative spectrometry 3
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Registered / In Force 19
Found results for  patents

1.

METHOD, APPARATUS AND SYSTEM FOR COMPACT OPTICAL GAS ABSORPTION MEASUREMENTS

      
Application Number 18619903
Status Pending
Filing Date 2024-03-28
First Publication Date 2024-10-17
Owner Servomex Group Limited (United Kingdom)
Inventor
  • Ratcliffe, Michael
  • Alizadeh, Bahram
  • Lopez, Martin
  • Lawson, Michael

Abstract

An apparatus comprising a compact, folded path cell for optical gas detection and/or measurement utilising gas absorption spectroscopy. The apparatus includes a source of electromagnetic radiation, a gas sample cell containing reflective elements, and a detector of electromagnetic radiation. The source and detector are arranged between the reflective elements in an arrangement that reflects the radiation away from the source and detector until the reflected radiation has an adequate optical path length, and then reflects the radiation towards the detector. A spectroscopic analysis can be used to determine the presence and/or to measure at least one parameter of at least one gas species within a gas sample.

IPC Classes  ?

  • G01N 21/3504 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
  • G01N 21/05 - Flow-through cuvettes
  • G01N 21/39 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers

2.

METHOD AND APPARATUS FOR USE IN OPTICAL GAS ABSORPTION MEASUREMENTS

      
Application Number 18619846
Status Pending
Filing Date 2024-03-28
First Publication Date 2024-10-03
Owner Servomex Group Limited (United Kingdom)
Inventor
  • Alizadeh, Bahram
  • Lopez, Martin
  • Lawson, Michael
  • Ratcliffe, Michael

Abstract

An apparatus for use in absorption spectroscopy, comprising: at least one source of electromagnetic radiation for transmitting electromagnetic radiation along an optical path that passes through a gas measurement volume, towards at least one detector; at least one detector to detect the transmitted electromagnetic radiation after passing through the gas measurement volume and to provide an output signal indicative of the detected electromagnetic radiation; and an analyser connected to the at least one detector to receive the output signal and analyse the effects of absorption by at least one gas species within the gas measurement volume for at least one wavelength range of the transmitted electromagnetic radiation, thereby to detect or measure a parameter of the at least one gas species; wherein at least one source or detector comprises a Chip-on-Board (COB) component comprising a solid-state source and/or detector of electromagnetic radiation mounted onto a substrate in a COB configuration.

IPC Classes  ?

  • G01N 21/31 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
  • G01N 33/00 - Investigating or analysing materials by specific methods not covered by groups

3.

APPARATUS FOR COMPACT OPTICAL GAS ABSORPTION MEASUREMENTS

      
Application Number GB2024050879
Publication Number 2024/201072
Status In Force
Filing Date 2024-03-28
Publication Date 2024-10-03
Owner SERVOMEX GROUP LIMITED (United Kingdom)
Inventor
  • Ratcliffe, Michael
  • Lopez, Martin
  • Lawson, Michael
  • Alizadeh, Bahram

Abstract

An apparatus comprising a compact, folded path cell for optical gas detection and/or measurement utilising gas absorption spectroscopy. The apparatus includes a source of electromagnetic radiation (1601), a gas sample cell (1606) containing reflective elements (1604, 1605), and a detector of electromagnetic radiation (1602). The source (1601) and detector (1602) are arranged between the reflective elements (1604, 1605) in an arrangement that reflects the radiation away from the source (1601) and detector (1602) until the reflected radiation has an adequate optical path length, and then reflects the radiation towards the detector (1602). A spectroscopic analysis can be used to determine the presence and/or to measure at least one parameter of at least one gas species within a gas sample.

IPC Classes  ?

  • G01N 21/03 - Cuvette constructions
  • G01N 21/05 - Flow-through cuvettes
  • G01N 21/3504 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
  • G01N 21/39 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
  • G01N 21/15 - Preventing contamination of the components of the optical system or obstruction of the light path

4.

METHOD AND APPARATUS FOR USE IN OPTICAL GAS ABSORPTION MEASUREMENTS

      
Application Number GB2024050884
Publication Number 2024/201074
Status In Force
Filing Date 2024-03-28
Publication Date 2024-10-03
Owner SERVOMEX GROUP LIMITED (United Kingdom)
Inventor
  • Alizadeh, Bahram
  • Lopez, Martin
  • Lawson, Michael
  • Ratcliffe, Michael

Abstract

An apparatus for use in absorption spectroscopy, comprising: at least one source of electromagnetic radiation (301) for transmitting electromagnetic radiation along an optical path that passes through a gas measurement volume, towards at least one detector (302); the at least one detector (302) to detect the transmitted electromagnetic radiation after passing through the gas measurement volume and to provide an output signal indicative of the detected electromagnetic radiation; and an analyser connected to the at least one detector to receive the output signal and analyse the effects of absorption by at least one gas species within the gas measurement volume for at least one wavelength range of the transmitted electromagnetic radiation, thereby to detect or measure a parameter of the at least one gas species; wherein at least one source or detector comprises a Chip-on-Board (COB) component comprising a solid-state source and/or detector of electromagnetic radiation mounted onto a substrate in a COB configuration.

IPC Classes  ?

  • G01N 21/03 - Cuvette constructions
  • G01N 21/3504 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
  • G01J 3/10 - Arrangements of light sources specially adapted for spectrometry or colorimetry
  • G01J 3/50 - Measurement of colourColour measuring devices, e.g. colorimeters using electric radiation detectors
  • G01N 21/39 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
  • G01N 21/15 - Preventing contamination of the components of the optical system or obstruction of the light path

5.

APPARATUS, SYSTEMS AND METHODS FOR USE IN OPTICAL GAS ABSORPTION MEASUREMENTS

      
Application Number 18619884
Status Pending
Filing Date 2024-03-28
First Publication Date 2024-10-03
Owner Servomex Group Limited (United Kingdom)
Inventor
  • Lawson, Michael
  • Alizadeh, Bahram
  • Lopez, Martin
  • Ratcliffe, Michael

Abstract

An apparatus for optical gas detection and/or measurement in an absorption spectroscopy system comprising: a gas cell for containing a gas sample or calibration gas with at least one gas exchange port and at least one optical element for allowing transmission of electromagnetic radiation of a desired wavelength range in and out of the gas cell; and at least one source of converging, diverging or collimated electromagnetic radiation for transmitting electromagnetic radiation through a gas sample contained within the gas cell and towards at least one detector; said detector to monitor absorption of electromagnetic radiation for at least one absorption wavelength or wavelength range associated with at least one gas species, by detecting transmitted electromagnetic radiation that is not absorbed; at least one analyser for analysing an output signal from the at least one detector to measure a parameter of at least one gas species within the gas sample, characterised in that at least one dead volume within the spectrometer is filled with a transmissive filler material that reduces or eliminates the presence of at least one undesired gas species.

IPC Classes  ?

  • G01N 21/3504 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
  • G01J 3/433 - Modulation spectrometryDerivative spectrometry
  • G01N 21/39 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers

6.

APPARATUS, SYSTEMS AND METHODS FOR USE IN OPTICAL GAS ABSORPTION MEASUREMENTS

      
Application Number GB2024050892
Publication Number 2024/201080
Status In Force
Filing Date 2024-03-28
Publication Date 2024-10-03
Owner SERVOMEX GROUP LIMITED (United Kingdom)
Inventor
  • Lawson, Michael
  • Alizadeh, Bahram
  • Ratcliffe, Michael
  • Lopez, Martin
  • Proctor, Michael James

Abstract

whereinwherein at least one dead volume within the spectrometer is filled with a transmissive filler material that reduces or eliminates the presence of at least one undesired gas species.

IPC Classes  ?

  • G01N 21/03 - Cuvette constructions
  • G01N 21/15 - Preventing contamination of the components of the optical system or obstruction of the light path
  • G01N 21/39 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
  • G01N 21/05 - Flow-through cuvettes
  • G01N 21/3504 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis

7.

MAGNETIC STABILIZATION METHOD AND SYSTEM IN INFRARED, VISIBLE AND ULTRAVIOLET SPECTROSCOPY

      
Application Number 18541744
Status Pending
Filing Date 2023-12-15
First Publication Date 2024-06-27
Owner Servomex Group Limited (United Kingdom)
Inventor
  • Buccino, Giuseppe
  • Lopez, Martin

Abstract

In a spectroscopic analysis system, a broadband light source emits infra-red, visible or ultra-violet light which is transmitted through a fluid in a sample cell to a broadband detector. Changes in transmitted intensity are related to measurand in the fluid. A rotatable optical modulator or chopper, driven by an electric motor and located in the optical path, has light-transmissive optical elements, and non-transmissive regions. A non-contact magnetic field generator applies a magnetic field to the modulator or chopper to damp or brake the rotation. In an aspect, the modulator is an electrically conductive, non-ferromagnetic wheel, disc or cylinder in which eddy currents are induced. Optical elements may be apertures, filters, cuvettes, etc. A Hall effect sensor, rotary encoder, optical switch, etc. may determine angular speed or position of the modulator, and a PID controller may be used to maintain rotation speed at a setpoint by modulating an electromagnetic field generator.

IPC Classes  ?

  • G01N 21/31 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry

8.

ELECTROMAGNETIC CONTROL OF ABSORPTION AND SUPPRESSION OF SPECTRAL ARTIFACTS

      
Application Number 17934300
Status Pending
Filing Date 2022-09-22
First Publication Date 2023-03-30
Owner Servomex Group Limited (United Kingdom)
Inventor
  • Lawson, Michael
  • Lopez, Martin
  • Alizadeh, Bahram

Abstract

A method and system for the suppression and/or modulation of absorption spectrum artifacts for the purpose of gas detection and concentration measurements using at least one magnetic, electric or electromagnetic field. A field applied selectively to at least one section of the system modulates absorption by influencing quantum energy state transitions of gas species.

IPC Classes  ?

  • G01N 21/25 - ColourSpectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
  • G01N 21/31 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
  • G01N 21/3504 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis

9.

Glow plasma gas measurement signal processing

      
Application Number 17223941
Grant Number 11948774
Status In Force
Filing Date 2021-04-06
First Publication Date 2021-10-07
Grant Date 2024-04-02
Owner Servomex Group Limited (United Kingdom)
Inventor
  • Alizadeh, Bahram
  • Lopez, Martin

Abstract

Methods and apparatus for determination of the gas composition of a sample gas using glow discharge optical emission spectroscopy, in which the method comprises: generating one or more oscillating electromagnetic fields within a plasma cell to excite particles within the cell, to produce a glow discharge plasma in the plasma cell, and controlling the operating conditions for the plasma cell while flowing a gas mixture through the plasma cell to maintain glow discharge optical emissions from the plasma within a desired operating range; and monitoring one or more glow discharge optical emissions from the plasma in the plasma cell by measuring the optical emissions, or measuring a signal that correlates with the optical emissions, at twice the plasma excitation frequency; and processing the signal during each excitation cycle of the electromagnetic excitation, to determine the concentration of a gas within a gas mixture flowing through the plasma cell.

IPC Classes  ?

  • H01J 37/32 - Gas-filled discharge tubes
  • G01J 3/443 - Emission spectrometry
  • G01N 21/67 - Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light electrically excited, e.g. electroluminescence using electric arcs or discharges
  • G01N 21/68 - Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light electrically excited, e.g. electroluminescence using high frequency electric fields
  • H05H 1/00 - Generating plasmaHandling plasma
  • H05H 1/24 - Generating plasma
  • H05H 1/46 - Generating plasma using applied electromagnetic fields, e.g. high frequency or microwave energy

10.

GLOW PLASMA GAS MEASUREMENT SIGNAL PROCESSING

      
Document Number 03114186
Status Pending
Filing Date 2021-04-06
Open to Public Date 2021-10-06
Owner SERVOMEX GROUP LIMITED (United Kingdom)
Inventor
  • Alizadeh, Bahram
  • Lopez, Martin

Abstract

Provided are methods, apparatuses and systems for enhanced determination of the gas composition of a sample gas using glow discharge optical emission spectroscopy (GD-OES) for gas analysis. A first method comprises: generating one or more oscillating electromagnetic fields within a plasma cell to excite particles within the cell, to produce a glow discharge plasma in the plasma cell, and controlling the operating conditions for the plasma cell while flowing a gas mixture through the plasma cell to maintain glow discharge optical emissions from the plasma within a desired operating range; and monitoring one or more glow discharge optical emissions from the plasma in the plasma cell; wherein said monitoring of the optical emissions comprises measuring the optical emissions, or measuring a signal that correlates with the optical emissions, at twice the plasma excitation frequency; and processing the signal during each excitation cycle of the electromagnetic excitation, to determine the concentration of a gas within a gas mixture flowing through the plasma cell.

IPC Classes  ?

  • G01N 21/68 - Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light electrically excited, e.g. electroluminescence using high frequency electric fields

11.

GLOW PLASMA STABILIZATION

      
Application Number 16841051
Status Pending
Filing Date 2020-04-06
First Publication Date 2020-10-29
Owner Servomex Group Limited (United Kingdom)
Inventor
  • Alizadeh, Bahram
  • Lopez, Martin
  • Ratcliffe, Michael Anthony
  • Batson, Nicky Jay

Abstract

Provided are methods, apparatus and systems for stabilization of a glow discharge from a plasma. Also provided are methods, apparatus and systems for processing optical signals from a stabilised glow plasma with enhanced signal to noise recovery. A first method comprises: generating an electric field within a plasma cell using an alternating excitation voltage to excite particles within the cell, to produce a glow discharge from a plasma in the plasma cell in a resonant condition; monitoring, in each excitation cycle of the alternating excitation voltage, one or more signals that correlate with glow discharge optical emissions from the plasma in the plasma cell; and, in response to said monitoring, controlling one or more operating conditions for the plasma cell to maintain the glow discharge emissions from the plasma within a desired operating range in each excitation cycle of the alternating excitation voltage. A relatively stable glow discharge optical emission is maintained via dynamic resonant feedback control of operating conditions such as the electric field that is used to excite particles within the plasma cell. The stabilization of the glow plasma can be used in glow discharge optical emission spectroscopy (GD-OES) for gas analysis and in other applications.

IPC Classes  ?

12.

Method and system for reduction of influence of baseline distortion in absorption spectroscopy measurements

      
Application Number 15355058
Grant Number 10234378
Status In Force
Filing Date 2016-11-18
First Publication Date 2017-05-18
Grant Date 2019-03-19
Owner Servomex Group Limited (United Kingdom)
Inventor
  • Alizadeh, Bahram
  • Hobby, James
  • Lopez, Martin
  • Gaskin, Ian

Abstract

A method and system for reducing the effect of distortions on the baseline signal in an absorption spectroscopy system used for the detection or measurement of chemical species in a medium, whereby one or more correlations or convolutions are performed on the signal using a kernel function. The shape of the kernel function is chosen to reduce the influence of the baseline distortions on the processed measurand determination. The kernel function may also be chosen to enhance the absorption signal.

IPC Classes  ?

  • G01N 21/3504 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
  • G01N 21/27 - ColourSpectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using photo-electric detection
  • G01N 21/39 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
  • G01J 3/28 - Investigating the spectrum
  • G01J 3/433 - Modulation spectrometryDerivative spectrometry

13.

Alignment device and transmitter/receiver system with two angular degrees of freedom

      
Application Number 14811937
Grant Number 11119290
Status In Force
Filing Date 2015-07-29
First Publication Date 2016-02-11
Grant Date 2021-09-14
Owner SERVOMEX GROUP LIMITED (USA)
Inventor
  • Gaskin, Ian C.
  • Hobby, James D.
  • Kovacich, Richard P.
  • Lopez, Martin
  • Terry, Graham R.

Abstract

An alignment device having two angular degrees of freedom is provided. The alignment device is adjustable such that it is suitable for aligning a first apparatus with respect to a second apparatus. The first apparatus may emit one or more of electromagnetic waves, acoustic waves and matter towards the second apparatus and for detection by the second apparatus. The first and second apparatuses may be disposed in a harsh environment such as is found in the vicinity of an industrial process stack. In some embodiments the first apparatus is a laser, preferably a tunable diode laser, and the second apparatus is a receiver incorporating a detector. In these embodiments the apparatuses may be used to perform laser absorption spectroscopy on a process gas flowing through an industrial process stack.

IPC Classes  ?

  • G01N 21/49 - Scattering, i.e. diffuse reflection within a body or fluid
  • G02B 7/00 - Mountings, adjusting means, or light-tight connections, for optical elements
  • G01J 3/02 - SpectrometrySpectrophotometryMonochromatorsMeasuring colours Details
  • G01J 3/42 - Absorption spectrometryDouble-beam spectrometryFlicker spectrometryReflection spectrometry
  • G01B 11/27 - Measuring arrangements characterised by the use of optical techniques for measuring angles or tapersMeasuring arrangements characterised by the use of optical techniques for testing the alignment of axes for testing the alignment of axes
  • G01N 21/39 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
  • G02B 27/00 - Optical systems or apparatus not provided for by any of the groups ,
  • G02B 27/62 - Optical apparatus specially adapted for adjusting optical elements during the assembly of optical systems
  • G02B 7/02 - Mountings, adjusting means, or light-tight connections, for optical elements for lenses

14.

Attachment and alignment device for optical sources, detectors and analysers, and modular analysis system

      
Application Number 14673941
Grant Number 09766124
Status In Force
Filing Date 2015-03-31
First Publication Date 2015-10-08
Grant Date 2017-09-19
Owner Servomex Group Limited (United Kingdom)
Inventor
  • Kasiutsich, Vasili
  • Lopez, Martin

Abstract

A device is provided for combining two or more separate components of an optical analysis system, to use common entrance and exit apertures for optical measurements across a measurement space such as a stack, combustion chamber, duct or pipeline, in such way that the optical paths from the respective light sources to detectors are substantially the same, enabling multiple optical measurements over a single optical path or closely aligned optical paths with equivalent ambient conditions such as temperature and pressure distribution and background substance concentrations. The device and a set of interconnectable devices forming a modular system are useful, for example, in absorption spectroscopy, such as for measuring the amount fraction of the chemical constituents of a fluid in a measurement volume.

IPC Classes  ?

  • G01J 3/02 - SpectrometrySpectrophotometryMonochromatorsMeasuring colours Details
  • G02B 27/10 - Beam splitting or combining systems
  • G01N 21/29 - ColourSpectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using visual detection
  • G01N 21/39 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
  • G01N 21/3504 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
  • G01J 3/42 - Absorption spectrometryDouble-beam spectrometryFlicker spectrometryReflection spectrometry

15.

Method and system for correcting incident light fluctuations in absorption spectroscopy

      
Application Number 14662307
Grant Number 09546902
Status In Force
Filing Date 2015-03-19
First Publication Date 2015-09-24
Grant Date 2017-01-17
Owner Servomex Group Limited (United Kingdom)
Inventor
  • Kovacich, Richard P.
  • Alizadeh, Bahram
  • Gaskin, Ian C.
  • Hobby, James D.
  • Lopez, Martin

Abstract

A method and system for correcting the effect of intensity fluctuations of the transmitted light in an absorption spectroscopy system used for the detection or measurement of chemical species in a medium, whereby one or more modulation bursts are imposed onto a light beam that passes through the medium. This burst signal may be obtained by modulating the bias current of a tunable diode laser, and the modulation burst signal may be optimally at the second harmonic of the modulation frequency of a wavelength modulated beam to allow usage of the same signal path processing used for the spectroscopic detection of the measurand for a second harmonic detection system. The burst signal can be controlled using a smooth window function to minimise the effects of non-linear perturbations that are inherent in tunable diode laser wavelength modulation spectroscopy systems, of optical interference fringes (etalons) and of the residual light absorption by background chemical species or the measurand at the wavelength coinciding with the modulation burst.

IPC Classes  ?

  • G01N 21/00 - Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
  • G01J 3/02 - SpectrometrySpectrophotometryMonochromatorsMeasuring colours Details
  • G01J 3/10 - Arrangements of light sources specially adapted for spectrometry or colorimetry
  • G01J 3/433 - Modulation spectrometryDerivative spectrometry
  • G01N 21/39 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
  • G01N 21/27 - ColourSpectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using photo-electric detection
  • G01J 3/42 - Absorption spectrometryDouble-beam spectrometryFlicker spectrometryReflection spectrometry

16.

Paramagnetic gas sensor apparatus and adjustment method

      
Application Number 13365814
Grant Number 09091658
Status In Force
Filing Date 2012-02-03
First Publication Date 2012-08-09
Grant Date 2015-07-28
Owner Servomex Group Limited (United Kingdom)
Inventor
  • Gaskin, Ian C.
  • Kovacich, Richard P.
  • Edwards, Christopher R.
  • Hobby, James D.
  • Lopez, Martin

Abstract

This present invention relates to a device for the measurement of the amount of oxygen in a gas mixture, or other gas with significantly different magnetic susceptibility than the background gas mixture, by the use of a suspended test body in a magnetic field that experiences force due to the magnetic susceptibility of the measurand gas. In order to enable a fast time response for the system with a change in oxygen concentration, a flow regime is presented which allows a fast sweep of the measurement volume combined with adjustable, balanced pressure drops via a flow balancing element (or elements) within the flow channels to independently minimise flow related uncertainties.

IPC Classes  ?

  • G06G 7/57 - Analogue computers for specific processes, systems, or devices, e.g. simulators for fluid flow
  • G01N 27/74 - Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables of fluids

17.

Apparatus and methods for imbalance compensation

      
Application Number 13012676
Grant Number 08485014
Status In Force
Filing Date 2011-01-24
First Publication Date 2012-02-09
Grant Date 2013-07-16
Owner Servomex Group Limited (United Kingdom)
Inventor
  • Stocks, Colin
  • Hobby, James
  • Lopez, Martin
  • Edwards, Chris

Abstract

Provided are apparatus and methods for compensation of mechanical imbalance in a measurement apparatus, that provides options for increased accuracy and/or less expensive manufacture of a torsion balance. Orientation measurements are taken and an imbalance torque about the torsion spring's axis of rotation is determined, and used to calculate a compensation. The measurement apparatus of one embodiment includes a test body and a set of magnets for generating a first disturbing force on the test body in response to a paramagnetic gas. A conductor element in the magnetic field receives an electrical current that generates a second opposing force to the test body, under feedback control that varies the current until the test body achieves a balanced null position. The control signal required to achieve the fixed null position is measured. Corrections are then made for an imbalance mass by measuring the orientation of the apparatus relative to an acceleration or gravitational field and determining the imbalance torque resulting from the imbalance mass. Use of the invention can improve accuracy or reduce the cost of manufacture of a torsion balance, by enabling compensation for imbalances.

IPC Classes  ?

  • G01N 27/74 - Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables of fluids
  • G01N 27/76 - Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables of fluids by investigating susceptibility
  • G01D 3/06 - Measuring arrangements with provision for the special purposes referred to in the subgroups of this group with provision for operation by a null method
  • G01L 25/00 - Testing or calibrating of apparatus for measuring force, torque, work, mechanical power, or mechanical efficiency
  • G01P 21/00 - Testing or calibrating of apparatus or devices covered by the other groups of this subclass

18.

Compact paramagnetic oxygen sensor

      
Application Number 13129934
Grant Number 08847579
Status In Force
Filing Date 2009-11-19
First Publication Date 2011-12-15
Grant Date 2014-09-30
Owner Servomex Group Limited (United Kingdom)
Inventor
  • Kovacich, Richard P.
  • Stocks, Colin G.
  • Edwards, Christopher R.
  • Hobby, James D.

Abstract

An apparatus for the measurement of the magnetic susceptibility of a gas mixture comprises: a gas sample chamber (8) adapted to receive the gas mixture; a test body (1) rotatably suspended within the gas sample chamber; magnets (10) within the gas sample chamber; a compact optical system for detecting rotation of the test body (1) including a light source (12), photodetectors (13) arranged to detect a light signal, and a mirror (5) attached to the test body (1). An actuation system is arranged to keep the test body (1) substantially at a null position. The optical system comprises at least one photodetector positioned on each side of the light source. The light source is arranged to emit a light beam towards the test body. The photo detectors are arranged to each detect an edge of a light beam reflected from the mirror.

IPC Classes  ?

  • G01N 27/76 - Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables of fluids by investigating susceptibility
  • G01N 33/00 - Investigating or analysing materials by specific methods not covered by groups

19.

Apparatus for measuring the flow rate of a fluid

      
Application Number 13151644
Grant Number 08650947
Status In Force
Filing Date 2011-06-02
First Publication Date 2011-12-08
Grant Date 2014-02-18
Owner Servomex Group Limited (United Kingdom)
Inventor
  • Lopez, Martin
  • Hobby, James
  • Aylward, Gary Robert
  • Alizadeh, Bahram

Abstract

Provided is a compact apparatus for measuring the flow rate of a fluid. The apparatus includes a heated measure element and a heated reference element which are in substantially the same thermal environment within a measure cell, except that the measure element is situated in the path of the cooling fluid flow and the reference element is sheltered from this direct fluid flow. These elements are arranged as parallel and concentric planar elements that are essentially identical to each other with matching thermal characteristics. The elements are electrically connected in a Wheatstone bridge arrangement. Thermal exchange between the reference and measure elements is used to optimise noise rejection due to common mode background thermal effects. Measured parameters from the bridge can be used to derive the fluid flow rate.

IPC Classes  ?

  • G01F 1/68 - Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects

20.

COMPACT PARAMAGNETIC OXYGEN SENSOR

      
Application Number GB2009002702
Publication Number 2010/058168
Status In Force
Filing Date 2009-11-19
Publication Date 2010-05-27
Owner SERVOMEX GROUP LIMITED (United Kingdom)
Inventor
  • Kovacich, Richard Paul
  • Stocks, Colin Geoffrey
  • Edwards, Christopher Richard
  • Hobby, James David

Abstract

An apparatus for the measurement of the magnetic susceptibility of a gas mixture comprises: a gas sample chamber (8) adapted to receive the gas mixture, and a test body (1) rotatably suspended within the gas sample chamber; means (10) for creating an inhomogeneous magnetic field within the gas sample chamber; means for detecting rotational motion of the test (body 1), comprising a compact optical system including a light source (12) and photodetectors (13) arranged to detect a light signal indicative of the rotational motion; and an actuation system (4) arranged to keep the test body (1) substantially at a null position determined by said optical system, wherein the optical system comprises at least one photodetector (13) positioned on either side of the plane which is normal to the mirror and parallel with the rotation axis of the test body, having the light source (12) positioned in the plane. For enhanced performance, an optical element (16) is placed in front of the light source or photodetectors to modify properties of the light emitted by the light source or received by the photodetectors.

IPC Classes  ?

  • G01N 27/76 - Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables of fluids by investigating susceptibility

21.

Chromatographic systems and methods for eliminating interference from interfering agents

      
Application Number 12090717
Grant Number 07824471
Status In Force
Filing Date 2006-03-10
First Publication Date 2009-07-02
Grant Date 2010-11-02
Owner SERVOMEX GROUP LIMITED (United Kingdom)
Inventor
  • Gamache, Yves
  • Fortier, Andre

Abstract

The present invention provides a chromatographic method for eliminating interference from interfering agents, coming from the gas sample itself or from the system material used to perform the impurities measurements, on impurities to be quantified in a gas sample. The method advantageously relies on the use of an additional valve and an additional sample loop particularly arranged in a G. C. system, and also on an additional supporting gas inlet operatively connected to the system through the additional sample loop for providing the system with a supporting gas comprising at least a predetermined portion of a predetermined active gas that will react with the unwanted interfering impurities, if any, or with the column material to cancel out unwanted active sites. Thus, the method of the present invention can advantageously be used in gas chromatographic systems to improve sensitivity thereof by acting on column separation material.

IPC Classes  ?

  • B01D 53/02 - Separation of gases or vapoursRecovering vapours of volatile solvents from gasesChemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases or aerosols by adsorption, e.g. preparative gas chromatography

22.

System and method of eliminating interference for impurities measurement in noble gases

      
Application Number 12280712
Grant Number 08239171
Status In Force
Filing Date 2007-02-28
First Publication Date 2009-05-21
Grant Date 2012-08-07
Owner SERVOMEX GROUP LIMITED (United Kingdom)
Inventor
  • Gamache, Yves
  • Fortier, André

Abstract

The invention provides a system and a method of eliminating interference for impurities measurement in noble gases based on emission spectroscopy which provide very stable, sensitive and interference free results. The method mainly relies on the use of a combination of particularly designed means serially connected for cancelling interferences and proper means for correcting linearity issues. The proposed method is particularly advantageous since it offers long-term stability while providing very accurate and reliable results, even at sub-ppb and up to 10,000 ppm levels, whatever the surrounding conditions and the additional impurities that could be present in the gas under analysis.

IPC Classes  ?

  • H03F 1/26 - Modifications of amplifiers to reduce influence of noise generated by amplifying elements

23.

Probe

      
Application Number 11971955
Grant Number 08069738
Status In Force
Filing Date 2008-01-10
First Publication Date 2008-07-17
Grant Date 2011-12-06
Owner Servomex Group Limited (United Kingdom)
Inventor
  • Lopez, Martin
  • Hobby, James
  • Kovacich, Richard P.

Abstract

The present invention relates to a probe having an elongated main body with a proximal end for attachment to a wall of a duct or volume and a distal end that is disposed on the interior of the duct, such that the main body forms a measurement space through which the fluid is drawn for analysis.

IPC Classes  ?

  • G01N 1/14 - Suction devices, e.g. pumpsEjector devices

24.

Thermal conductivity sensor

      
Application Number 11687760
Grant Number 07753582
Status In Force
Filing Date 2007-03-19
First Publication Date 2007-09-27
Grant Date 2010-07-13
Owner Servomex Group Limited (United Kingdom)
Inventor
  • Lopez, Martin
  • Hobby, James
  • Alizadeh, Bahram
  • Kovacich, Richard P.

Abstract

A sensor for determining the thermal conductivity of a fluid comprising a sensing module located within a housing having inlet and outlet ports for a fluid under test, the sensing module comprising a reference base surface and a sensing element spaced therefrom and having measure and reference sections, and there being provided electrical power monitoring means for monitoring the power through the measure and reference sections in order to generate a signal indicative of the power difference due to thermal conductivity through the fluid. The sensing element is a thick film printed disc with measure and reference resistors printed on it. All changes in the fluid are common to both the measure and reference sections except for the thermal conductivity of the fluid itself.

IPC Classes  ?

  • G01N 25/18 - Investigating or analysing materials by the use of thermal means by investigating thermal conductivity
  • G01K 17/00 - Measuring quantity of heat
  • G01K 1/00 - Details of thermometers not specially adapted for particular types of thermometer
  • G01K 7/00 - Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat

25.

Method for cross interference correction for correlation spectroscopy

      
Application Number 11539962
Grant Number 07751051
Status In Force
Filing Date 2006-10-10
First Publication Date 2007-05-24
Grant Date 2010-07-06
Owner Servomex Group Limited (United Kingdom)
Inventor
  • Hobby, James
  • Lopez, Martin

Abstract

Correlation spectroscopy measure is improved by correcting for cross interference. This is achieved through applying different gains to the output signals whereby the effect of background interferent species can be calculated and an automatic correction factor applied.

IPC Classes  ?

  • G01N 21/00 - Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light

26.

Chromatographic methods for measuring impurities in a gas sample

      
Application Number 11361068
Grant Number 07451634
Status In Force
Filing Date 2006-02-22
First Publication Date 2006-09-07
Grant Date 2008-11-18
Owner SERVOMEX GROUP LIMITED (United Kingdom)
Inventor
  • Gamache, Yves
  • Fortier, André´

Abstract

An improved chromatographic method for measuring impurities in a gas sample that allows extraction of a peak of impurity masked by the sample background. An impurity peak is extracted from the sample background and put in a second sample loop and the second sample loop volume is injected into a second separation column. A “slice” is taken from the sample background to fill the second sample loop and the “slice”, whose width is preferably substantially equal to the impurities peak width, is injected into the second separation column. Another embodiment allows concentration of a predetermined impurity, thereby providing an improved precision on the results. The chromatographic method provides an improved measure of argon in oxygen, oxygen in argon and oxygen in hydrogen.

IPC Classes  ?

  • G01N 30/04 - Preparation or injection of sample to be analysed
  • G01N 30/46 - Flow patterns using more than one column
  • G01N 30/88 - Integrated analysis systems specially adapted therefor, not covered by a single one of groups