Electro-optical fluid detector

Communications: electrical – Condition responsive indicating system – Specific condition

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Details

250573, 340606, G08B 2100

Patent

active

046315292

ABSTRACT:
An electro-optical circuit for detecting fluid in a translucent or a transparent duct or tube, this circuit including an AC activated light emitting diode (LED) for transmitting a narrow beam of light through the tube and a photo transistor detection, sub-circuit activated by the LED light beam, the power to the LED being adjusted to operate the photo transistor of the detection circuit in its unsaturated, active region of operation.

REFERENCES:
patent: 4210138 (1980-07-01), Jess et al.
patent: 4213454 (1980-07-01), Shim
patent: 4280495 (1981-07-01), Lampert
patent: 4312341 (1982-01-01), Zissimopoulos et al.

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