System and method for optically controlled acoustic transmission

Details System and method for optically controlled acoustic transmission System and method for optically controlled acoustic transmission

1989-12-08

1990-08-28

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250577, G01N 1506

Patent

active

049527975

ABSTRACT:
The system and method provide an electrically passive optically controlled acoustic transceiver system which measures the quantity of a liquid, such as aircraft fuel, in a tank. Pulsed electromagnetic radiation, such as light or infrared radiation, is guided through an optical fiber and impinged upon a flexible member adapted to flex when heated and transmit acoustic pulses. An optical fiber detector, is used to monitor the acoustic pulses reflected from the liquid level in a fuel tank. The system is electrically passive and does not require or use electrical power at the sensing location.

REFERENCES:
patent: 4493996 (1985-01-01), Sterling
patent: 4567451 (1986-01-01), Greenwood
patent: 4677305 (1987-06-01), Ellinger
patent: 4772786 (1988-09-01), Langdon

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