Thermal measuring and testing – Emissivity determination
Patent
1990-04-10
1992-10-13
Yasich, Daniel M.
Thermal measuring and testing
Emissivity determination
25022714, 374 32, 374126, 374129, 374131, 392416, G01J 510, G01N 2520, H05B 362
Patent
active
051545128
ABSTRACT:
A non-contact pyrometric technique is provided for measuring the temperature and/or emissivity of an object that is being heated by electromagnetic radiation within the optical range. The measurement is made at short wavelengths for the best results. The measurement may be made at wavelengths within those of the heating optical radiation, and the resulting potential error from detecting heating radiation reflected from the object is avoided by one of two specific techniques. A first technique utilizes a mirror positioned between the heating lamps and the object, the mirror reflecting a narrow wavelength band of radiation in which the optical pyrometer detector operates. The second technique is to independently measure the a.c. ripple of the heating lamp radiation and subtract the background optical noise from the detected object signal in order to determine temperature and emissivity of the object. Both of these techniques can be combined, if desired.
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Adams Bruce E.
Schietinger Charles W.
Luxtron Corporation
Yasich Daniel M.
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