Fibre optic sensor for liquid level and other parameters

Details Fibre optic sensor for liquid level and other parameters Fibre optic sensor for liquid level and other parameters

1988-03-15

1989-09-26

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250227, 73293, G01N 1506

Patent

active

048702927

ABSTRACT:
A fibre optic sensor, particularly for ascertaining fluid levels, utilizes at least two optical fibres having at least a portion thereof embedded in a transparent substrate material of similar refractive index. One of the fibres is coupled to a light source, the other to a light detector. The fibres are oriented in a plane relative to the interface between substrate and fluid so that light exiting the source fibre is coupled to the detector fibre when total internal reflection at the interface occurs in the presence of a first fluid. In the presence of a second fluid of higher refractive index than the first fluid there will be no coupling. Several different embodiments, to achieve discrete or continuous level sensing or the sensing of other parameters are disclosed.

REFERENCES:
patent: 3995168 (1976-11-01), Neuscheler et al.
patent: 4119860 (1978-10-01), Gooley
patent: 4246489 (1981-01-01), Yoshida
patent: 4354180 (1982-10-01), Harding
patent: 4440022 (1984-04-01), Masom
patent: 4727247 (1988-02-01), Johnston
patent: 4788444 (1988-11-01), Williams
"Innovations", Oct., 1987, vol. 2, No. 1, pp. 6-7.
Belkerdid et al.; "Fiber Optic Fluid Level Sensor", SPIE vol. 566, Fiber Optic and Laser Sensors III (1985), pp. 153-158.
K. Spenner et al.; "Experimental Investigations on Fiber Optic Liquid Level Sensors and Refractometers"; pp. 96-99.

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