Radiant energy – Calibration or standardization methods
Patent
1991-06-27
1992-06-16
Hannaher, Constantine
Radiant energy
Calibration or standardization methods
250341, 324421, G01D 1800, G01R 3102
Patent
active
051226618
ABSTRACT:
A unit for testing infrared radiation detection units which incorporate relay contacts that are readily rendered defective by increasing resistance through use, thereby rendering the infrared radiation detection unit defective or inaccurate. As an example, such radiation detection units which are tested include hot metal detectors, loop controllers or scanners, and optical barrier units used in steel manufacturing. The testing unit includes an infrared radiation source for radiating infrared rays to an infrared radiation detector on a detection unit to be tested, and the testing unit further includes a relay contact resistance tester for measuring resistance of the relay contacts which is comprised of a plurality of light emitting diode indicators connected in parallel with each other through a resistor current divider network which is connected in series with a power source and the relay contact in the unit to be tested. The resistance values in this network are selected and arranged such that the light emitting diode indicators progressively and successively extinguish as the electrical resistance of a serially connected relay contact to be tested increases.
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Glick Edward J.
Hannaher Constantine
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