Laser radiometer

Details Laser radiometer Laser radiometer

1981-11-09

1983-11-29

Yasich, Daniel M.

Thermal measuring and testing

Temperature measurement

In spaced noncontact relationship to specimen

356 43, 356 45, 356349, 374126, 374130, G01J 552, G01J 562

Patent

active

044178220

ABSTRACT:
The present invention teaches a unique laser radiometer capable of accurately measuring the radiation temperature of a radiant surface and independently measuring the surface's emissivity. A narrow-band radiometer is combined with a laser reflectometer to measure concurrently radiance and emissivity of a remote, hot surface. Together, radiance and emissivity yield the true surface temperature of the remote target. A narrow receiver bandwidth is attained by one of two methods; (a) heterodyne detection or (b) optical filtering. A direct measurement of emissivity is used to adjust the value obtained for the thermal radiation signal to substantially enhance the accuracy of the temperature measurement for a given subject surface. The technique provides substantially high detection sensitivity over a very narrow spectral bandwidth.

REFERENCES:
patent: 2702494 (1955-02-01), Lieneweg et al.
patent: 3264931 (1966-08-01), Ackerman et al.
patent: 3462224 (1969-08-01), Woods et al.
patent: 3482448 (1969-12-01), Gaffard
patent: 3611806 (1971-10-01), Hishikari
patent: 3822098 (1974-07-01), Rudder et al.
patent: 4081215 (1978-03-01), Penny et al.
patent: 4225230 (1980-09-01), Dostoomion et al.
patent: 4305640 (1981-12-01), Cullis et al.
Publ., "Temperature Measurement by Optical Pyrometry with the Aid of Lazer Radiation", by Traverse et al., Ultra-Refractories Lab. (C.N.R.S.) (Translated, from French by The Language Center, Inc., C-4813, NJ, 19 pages).

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