Thermal measuring and testing – Temperature measurement – In spaced noncontact relationship to specimen
Patent
1988-11-14
1989-11-28
Cuchlinkski, Jr., William A.
Thermal measuring and testing
Temperature measurement
In spaced noncontact relationship to specimen
374 9, 374126, 374123, 356 43, G01J 506, G01J 512
Patent
active
048833649
ABSTRACT:
A temperature measuring apparatus is provided for determining the temperature of a target material to be measured as compared with the temperature of a spaced reference source which has a temperature control for controlling the temperature of the reference source. A differential radiation detector having a first detector exposed to the target material and a second detector which is shielded from the target material and exposed to the reference source provides a differential output or error signal which is used to control the temperature of the reference source. When the reference source temperature is the same as the target, the temperature of the reference source is read out which is the temperature of the target material regardless of the emissivity. The differential radiation detector is positioned in spaced relation to the target material and is focused onto the target and the reference material and the error signal generated is used for controlling the temperature of the reference source. The reference source is preferably a heated plate having a step in the center thereof with a hole therein through which the differential detector means views the target as well as the plate. Using a hole prevents reflection from the target back through the plate to areas of uncontrolled temperature.
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Kelsall, D., "An Automatic Emissivity-Compensated Radiation Pyrometer", Journal of Sci. Instrum., Jan. 1963.
Barnes Engineering Company
Cuchlinkski, Jr. William A.
Gutierrez Diego F. F.
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