Liquid level indicator using laser beam

Details Liquid level indicator using laser beam Liquid level indicator using laser beam

1988-08-10

1990-07-03

Tarcza, Thomas H.

Optics: measuring and testing

Range or remote distance finding

With photodetection

356 4, 73 1H, 73293, 73305, 73306, G01C 308, G01F 2300, G01F 2330

Patent

active

049385909

ABSTRACT:
An fiber optic liquid level indicator with a floating reflector includes a reference scale provided with a reflector disposed in an upper space above the liquid level within a pressure vessel so that a reference distance usable to correct error due to pressure can be calculated on the basis of travel time of a laser beam pulse emitted from a laser generator and reflected from the reference scale reflector through an optical guide and lens. A beam change-over switch is used to selectively guide a laser beam pulse to either the floating reflector or to the reference scale reflector so that pulse travel time can be determined.

REFERENCES:
patent: 4037161 (1977-07-01), Westell
patent: 4269506 (1981-05-01), Johnson et al.
patent: 4732035 (1988-03-01), Lagergren et al.
patent: 4770526 (1988-09-01), Manhart et al.

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