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US 4,880,971 AGranted
Fiber optic liquid level sensor
OwnerLee A. Danischinventor
Life of this patent
Estimating the term…
Abstract
A liquid level sensor comprises a probe containing closely spaced therein an elongate light emitter and an elongate light collector, the housing of the probe permitting light to issue from the interior from the emitter and to return to the collector. A light transmitting medium fills the probe housing. Means are provided for feeding light to the emitter and from the collector. An indicator can be provided, adapted to provide a level indication obtained form the light fed from the collector.
Claims14
A liquid level sensor comprising:
- an elongate housing having at least part of its periphery of light transmitting material;
- an elongate light emitter and an elongate light collector extending side-by-side in said housing;
- a light transmitting medium in the housing and surrounding said emitter and said collector;
- means for feeding light to the emitter and means for feeding light from the collector;
- the index of refraction of said light transmitting medium being less than the index of refraction of said light transmitting material of said housing;
- and
- the index of refraction of said light transmitting medium being one of less than or equal to the index of refraction of the liquid the level of which is being sensed.
4 more elements
Dependencies are inferred from the claim text.