Thermal measuring and testing – Temperature measurement – In spaced noncontact relationship to specimen
Patent
1982-06-01
1984-08-21
Yasich, Daniel M.
Thermal measuring and testing
Temperature measurement
In spaced noncontact relationship to specimen
250353, 350 67, 356 46, G01J 552, G01J 554
Patent
active
044667485
ABSTRACT:
The radiometric measurement of the temperature of remote targets is usually done with a radiometer having a detector whose field of view is alternately switched between the target and a reference temperature source. The detector output is then used to change the reference source temperature to equal the target temperature. According to the invention the reference source temperature is not changed by the measuring apparatus. The difference in detector signals obtained from the target and reference source is used to calculate the target temperature from the known laws of thermal radiation and the known detectivity and spectral response of the detector. The invention can be incorporated in thermal imaging apparatus using the radiation detector scanned to form the thermal image as the radiometer detector. In such radiometric thermal imaging apparatus an array of detectors is scanned across the scene in a raster and a corresponding visual raster is produced. The output of one of the detectors is sampled at a point in the raster which is identified in the visual raster and which is aligned with the target. The output is also sampled when the detector is receiving radiation from the reference temperature source at a point between scans. The difference signal between these two samples is applied to a microprocessor, together with the reference source temperature, an estimate of target emissivity and the detector parameters. From these inputs the microprocessor is programmed to calculate the target temperature.
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Schechter Marc D.
U.S. Philips Corporation
Yasich Daniel M.
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