Abstract

The present disclosure relates to the field of mechanical engineering. In particular, the present disclosure relates an apparatus for homogenized mixing of gases for use with a chemiluminescent detector (CLD) comprising an outer conduit (102), an inner conduit (104), passing through said outer conduit (102), a first passage (104) defined through said inner conduit (102) for passage of one fluid of said two fluids, an inner wall (102') of said outer conduit (102) being spaced apart from an outer wall (104') of said inner conduit (104) to define a second passage (102A) for passage of the second fluid of said two fluids, said outer conduit (102) defining a bottom end (102B), said inner conduit (104) defining a first outlet (104B) recessed from said bottom end ( 102B). A reaction zone ( 106) is defined in the recess between said first outlet (104B) and bottom end (102B) for introducing the two fluids from said first passage (104A) and said second passage (102A), for homogenization. The technical advancement of the homogenizing apparatus of the present disclosure is that it facilitates homogeneous mixing of the gases and allows the mixture travel at the center of the detector of the CLD to avoid any loss of photons caused due to improper mixing, short-circuiting flow of the gases and quenching of light in the CLD.

IPC Classes  ?

• G01N 21/76 - ChemiluminescenceBioluminescence
• G01N 1/38 - Diluting, dispersing or mixing samples
• G01N 33/00 - Investigating or analysing materials by specific methods not covered by groups

Abstract

A radiation detector for a non-dispersive infrared gas analyzer has two detector chambers, which are surrounded by a housing and separated by a separating element permeable to infrared radiation and impermeable to gas and which can be filled with a radiation-absorbing measurement gas. A receiving element, which has a measuring system fastened therein and including a flow- or pressure-sensitive sensor, can be attached to a contact surface on an outer face of the housing. Each detector chamber is pneumatically connected to the measuring system by a channel, which extends in the housing and is open to gas. The housing of the radiation detector is modularly constructed and includes a base element, which encloses the channel, the separating element, and the measuring system fastened in the receiving element, and a first and a second outer element, each of which can be connected to the base element and surrounds a detector chamber. The outer elements have openings, which lie in the beam path of the infrared radiation and are sealed in a gas-tight manner by a radiation-permeable window. The receiving element and the first and the second outer elements are joined to the base element.

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 21/61 - Non-dispersive gas analysers

Abstract

The invention relates to a radiation detector (2) for a non-dispersive infrared gas analyzer having two detector chambers (6), which are surrounded by a housing (1) and separated by a separating element (7) permeable to infrared radiation and impermeable to gas and which can be filled with a radiation-absorbing measurement gas. A receiving element (9), which has a measuring system (10) fastened therein and comprising a flow- or pressure-sensitive sensor, can be attached to a contact surface (8) on an outer face of the housing (1). Each detector chamber (6) is pneumatically connected to the measuring system (10) by means of a channel (11), which extends in the housing (1) and is open to gas. The housing (1) of the radiation detector (2) is modularly constructed and comprises a base element (3), which encloses the channel (11), the separating element (7), and the measuring system (1) fastened in the receiving element (9), and a first and a second outer element (4, 5), each of which can be connected to the base element (3) and surrounds a detector chamber (6). The outer elements (4, 5) have openings, which lie in the beam path of the infrared radiation and are sealed in a gas-tight manner by means of a radiation-permeable window (12). The receiving element (9) and the first and the second outer elements (4, 5) are joined to the base element (3).

IPC Classes  ?

• G01N 21/37 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using pneumatic detection
• 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 21/61 - Non-dispersive gas analysers

Abstract

In a method and apparatus for measuring the optical absorption of samples having a light source (1), a photoelectric converter (8), a measurement beam path extending between the light source (1) and the converter (8), in which path the sample to be examined is arranged, a reference beam path extending between the light source (1) and the converter (8), in which path a reference sample is arranged, and a motor-driven chopper disc (10), the chopper disc (10) is configured with a first number of first openings (15) unblocking only the measurement beam path and a second number of second openings (16) unblocking only the path for the reference beam. A lock-in amplifier (21) and a device (17) for synchronising the lock-in amplifier (21) with the chopper disc (10) is connected to the converter (8) and an evaluation circuit (26) establishes the quotient of the transmitted intensity of the reference beam path detected by the converter (8) and the transmitted intensity of the measurement beam path detected by the converter (8) as a measurement for the concentration of the sample in such a way that the decrease in the intensity of the beam by absorption leads to an increase in sensitivity.

IPC Classes  ?

• G01N 21/59 - Transmissivity

Abstract

In the case of a method and an apparatus for measuring the optical absorption of samples with a light source (1), a photoelectric transducer (8), a measurement beam path which runs between the light source (1) and the transducer (8) and in which the sample to be examined is arranged, a reference beam path which runs between the light source (1) and the transducer (8) and in which a reference sample is arranged, and a motor-driven chopper disc (10), the chopper disc (10) is formed with a first number of first openings (15) which enable only the measurement beam path and a second number of second openings (16) which enable only the reference beam path. A lock-in amplifier (21) and a device (17) for synchronizing the lock-in amplifier (21) with the chopper disc (10) are connected to the transducer (8) and an evaluation circuit (26) forms the quotient of the transmitted intensity of the reference beam path, which is detected by the transducer (8), and the transmitted intensity of the measurement beam path, which is detected by the transducer (8), as a measure of the concentration of the sample in such a manner that the reduction in the radiation intensity as a result of absorption leads to an increase in the sensitivity.

IPC Classes  ?

• 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

Goods & Services

Scientific, optical and measuring apparatus and instruments; gas testing instruments. Repair, in particular repair and maintenance of scientific, optical and measuring apparatus and instruments, in particular gas analysers. Technical consultancy, in particular in the field of gas analysis.

Goods & Services

Scientific, optical and measuring apparatus and instruments; gas testing instruments. Repair, in particular repair and maintenance of scientific, optical and measuring apparatus and instruments, in particular gas analysers. Technical consultancy, in particular in the field of gas analysis.