US PATENT SUBCLASS 374 / 129
.~.~.~ Comparison with radiation reference standard

Current as of: June, 1999
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374 /   HD   THERMAL MEASURING AND TESTING

100  DF  TEMPERATURE MEASUREMENT (E.G., THERMOMETER) {13}
120  DF  .~ In spaced noncontact relationship to specimen {3}
121  DF  .~.~ By thermally emitted radiation {11}
129.~.~.~ Comparison with radiation reference standard

DEFINITION

Classification: 374/129

Comparison with radiation reference standard:

(under subclass 121) Subject matter including an arrangement for comparing the thermally emitted radiation to be measured with radiation from a reference emitter the radiation from which has a predetermined relationship to the emitter temperature.

(1) Note. Such emitters often have a high emissivity factor (E1), and include blackened elements and blackbody cavity radiators.

(2) Note. Comparison arrangement may include choppers alternating the measured and reference radiation.

SEE OR SEARCH THIS CLASS, SUBCLASS:

2, for a reference radiating device which is not a part of a radiation thermometer.

126, for radiation temperature measuring with increasing the emissivity of the thermally emitting surface.