Liquid level indicator

Details Liquid level indicator Liquid level indicator

1977-10-07

1979-05-15

Segal, Robert

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

73293, G01N 2126, G01N 2148

Patent

active

041550137

ABSTRACT:
A liquid level monitor using the difference between the refraction of light by a prism in contact with air and by the same prism in contact with liquid being monitored to give warning of low liquid level. In preferred form for monitoring engine oil level, light is transmitted to a prism by an incoming fiber optic lead and returned from the prism by a return fiber optic lead. When the oil level is normal, the prism is in contact with the oil and the incoming light is transmitted into the oil and dissipated. When the oil level drops, the incoming light is reflected by the prism to the return lead and the reflected light is used to provide the indication of low oil level.

REFERENCES:
patent: 2350712 (1944-06-01), Barsties
patent: 3448616 (1969-06-01), Wostl et al.
patent: 3454759 (1969-07-01), Calhoun
patent: 3639770 (1972-02-01), Zizelmann
patent: 3995169 (1976-11-01), Oddon

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