Optical fluid level sensor

Details Optical fluid level sensor Optical fluid level sensor

1987-11-02

1989-11-07

Cuchlinski, Jr., William A.

Measuring and testing

Liquid level or depth gauge

With illumination

G01F 2300

Patent

active

048783838

ABSTRACT:
The present invention is related to a sight glass(10) that utilizes both reflected light at a glass to air interface(40) as well as the light transmitted through a glass to fluid to glass interface(44) to form a light pattern that is indicative of the true fluid level. By requiring that light always appear in either an "air" or "fluid" channel(42,46), any absence of light is assumed due to film coated surfaces or to other abnormal conditions. An absence of light is a signal that maintenance is required.

REFERENCES:
patent: 2943530 (1960-07-01), Nagel
patent: 3543581 (1970-12-01), Ryder
patent: 4353252 (1982-10-01), Jeans

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