Substance detector device

Details Substance detector device Substance detector device

1986-04-23

1989-02-07

Evans, F. L.

Communications: electrical

Condition responsive indicating system

Specific condition

356136, G08B 1902

Patent

active

048034703

ABSTRACT:
The substance detection device comprises a transparent element and a light source for transmitting light through the transparent element onto a polished surface of the element. A pair of photodetectors are positioned for detecting intensity of light reflected from the polished surface and a circuit is provided for determining a difference in detected reflected light intensity on the photodetectors to determine a change in the critical angle of an optical interface at the polished surface.

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patent: 4379227 (1983-04-01), Kovacs
patent: 4422714 (1983-12-01), Benoit et al.
patent: 4538064 (1985-08-01), Kovacs

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