Thermal measuring and testing – Temperature measurement – Nonelectrical – nonmagnetic – or nonmechanical temperature...
Patent
1984-05-14
1987-11-24
Yasich, Daniel M.
Thermal measuring and testing
Temperature measurement
Nonelectrical, nonmagnetic, or nonmechanical temperature...
250231R, 2504581, 25230133, G01J 0558, G01K 1112
Patent
active
047084944
ABSTRACT:
The present invention provides new methods and their associated materials and devices for the remote optical measurements of temperatures with luminescent sensors. These methods allow the use of a single sensor to measure temperatures over a wide range from the cryogenic regions to well above ambient temperatures, up to about 800 K depending on the sensor. Using fiber optic links a single, inexpensive light source, for example a light emitting diode, and a single photodetector are used to obtain normalized measurements from a sensor, only minimally affected by fluctuations in the intensity of the excitation light source, fiber and/or connector losses or detector drift. One preferred embodiment of this invention can be used with most luminescent materials and does not require a temperature-dependent change in the luminescence properties of the sensor within the temperature range being measured. Another preferreed embodiment uses temperature-dependent luminescence decay times as temperature indicators, using a class of materials the luminescence quantum efficiency of which does not degrade within the temperature range being measured. The invention permits the use of a single sensor in two independent operative modes, thus providing redundancy and a self-checking feature.
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