Fiber optic systems for sensing temperature and other physical v

Details Fiber optic systems for sensing temperature and other physical v Fiber optic systems for sensing temperature and other physical v

1990-04-30

1992-02-25

Shoap, Allan N.

Thermal measuring and testing

Temperature measurement

In spaced noncontact relationship to specimen

374161, 374142, 356 44, 25022718, 25022723, 2504581, G01K 1120, G01K 1300, G01J 508

Patent

active

050908189

ABSTRACT:
The invention is drawn to methods and devices which allow the simultaneous optical measurement of temperature and another physical parameter using a single probe, a single interrogating light source and a single photodetector. The invention also allows the use of a single probe for meausring temperature in two independent physical modes, using a single interrogating light source and a single photodetector. The single probe includes a photoluminescent material having luminescent centers which when excited with transient interrogating light of a wavelength within a predetermined spectral range emit luminescence light from two excited electronic energy levels, one of them being higher than the other and having a higher rate of luminescence decay than the other level, and wherein the relative intensities of the luminescence light emitted from each of the two excited energy levels vary as a function of the probe temperature. The temperature measured by the probe is determined by measuring the decay time of the luminescence emitted from the probe.

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