Abstract

Ingredients of a fluorescent material are selected and apportioned to yield a fluorescence lifetime that varies monotonically within a specified range of temperatures of the fluorescent material. The fluorescent material includes both inert ingredients and active tuning ingredients that monotonically influence the dependency of fluorescence lifetime on temperature. The invention provides a method of adjusting a selected fluorescence material to result in variation of fluorescence lifetime with temperature that closely adhere to a monotonic reference function, of fluorescence lifetime versus temperature, that is specific for a temperature-range of interest. The reference function may be monotone-decreasing or monotone-increasing. On a manufacturing scale, fluorescent materials, thus adjusted, can be used to produce temperature sensors that are backward compatible. A system implementing the method employs a chemical-processing facility, an apparatus for measuring fluorescence lifetime, and a computation module for determining requisite adjustments to be fed back to the chemical facility.

IPC Classes  ?

• G01K 11/20 - Measuring temperature based on physical or chemical changes not covered by group , , , or using thermoluminescent materials

Abstract

A method for detecting a partial discharge in electric power equipment is disclosed. Two or more narrowband signals corresponding to respective frequency bands of the partial discharge are obtained by two or more receivers, and a temporal coincidence of the two or more narrowband signals is detected, thereby indicating a possible presence of the partial discharge. Then a synchronous recurrence of the partial discharge over a plurality of power cycles is determined, thereby validating the possible presence of the partial discharge. A corresponding system is also provided.

IPC Classes  ?

• G01R 31/12 - Testing dielectric strength or breakdown voltage

Abstract

Method and system for identifying sources of partial discharge (PD), from a set of potential sources, in an alternating current three-phase high-voltage power-distribution system are disclosed. A timing signal is generated, phase-locked to a selected phase of three phases of the power-distribution system, having a measurable phase displacement from the selected phase. A cyclical timer is generated for indicating time within a power cycle based on a master clock phase-locked to the timing signal. A power-cycle period is partitioned into a number of dual observation windows, each dual observation window corresponding to a potential source and having two individual windows, π-radians apart, and a specified window width. From a PD-detection apparatus, using the timing signal and the timer, magnitudes and time instants of PD detection during successive power cycles are received. PD detection is associated with respective dual observation windows, hence respective PD sources based, on the time instants.

IPC Classes  ?

• G01R 31/12 - Testing dielectric strength or breakdown voltage

Abstract

A method for detecting a partial discharge in electric power equipment is disclosed. Two or more narrowband signals corresponding to respective frequency bands of the partial discharge are obtained by two or more receivers, and a temporal coincidence of the two or more narrowband signals is detected, thereby indicating a possible presence of the partial discharge. Then a synchronous recurrence of the partial discharge over a plurality of power cycles is determined, thereby validating the possible presence of the partial discharge. A corresponding system is also provided.

IPC Classes  ?

• G01R 31/16 - Construction of testing vesselsElectrodes therefor

Abstract

A fluorescence sensor for use in phosphor thermometry is provided, the sensor comprising: an optical light guide which includes a distal end; and a sensing element, the sensing element attached to the distal end or located proximate to the distal end and in alignment with the distal end, the sensing element including a polycrystalline nanocomposite which includes at least one host, at least one dopant and at least one filler.

IPC Classes  ?

• G01K 11/3213 - Measuring temperature based on physical or chemical changes not covered by group , , , or using changes in transmittance, scattering or luminescence in optical fibres at discrete locations in the fibre, e.g. using Bragg scattering using changes in luminescence, e.g. at the distal end of the fibres

Abstract

A fluorescence sensor for use in phosphor thermometry is provided, the sensor comprising: an optical light guide which includes a distal end; and a sensing element, the sensing element attached to the distal end or located proximate to the distal end and in alignment with the distal end, the sensing element including a polycrystalline nanocomposite which includes at least one host, at least one dopant and at least one filler.

IPC Classes  ?

• G01K 11/3213 - Measuring temperature based on physical or chemical changes not covered by group , , , or using changes in transmittance, scattering or luminescence in optical fibres at discrete locations in the fibre, e.g. using Bragg scattering using changes in luminescence, e.g. at the distal end of the fibres

Abstract

A fluorescence sensor for use in phosphor thermometry is provided, the sensor comprising: an optical light guide which includes a distal end; and a sensing element, the sensing element attached to the distal end or located proximate to the distal end and in alignment with the distal end, the sensing element including a polycrystalline nanocomposite which includes at least one host, at least one dopant and at least one filler.

IPC Classes  ?

• G01K 11/3213 - Measuring temperature based on physical or chemical changes not covered by group , , , or using changes in transmittance, scattering or luminescence in optical fibres at discrete locations in the fibre, e.g. using Bragg scattering using changes in luminescence, e.g. at the distal end of the fibres

Abstract

A receptacle is provided for releasably retaining an optical fiber, the receptacle including: a housing with one or more receiver units, each receiver unit comprising an optical fiber receiver, which terminates proximally in a mouth, a cavity which is continuous with the optical fiber receiver, includes an upper surface, a base, a proximal side therebetween, a distal side therebetween, and a backstop on the distal side, the backstop including an aperture which is continuous with the cavity; and a clip, which is housed in the cavity and biased between the upper surface and the base of the cavity, such that the mouth of the optical fiber receiver is occluded by the clip.

IPC Classes  ?

• G02B 6/26 - Optical coupling means
• G02B 6/36 - Mechanical coupling means
• H05K 1/18 - Printed circuits structurally associated with non-printed electric components