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Electro-optical liquid level indicator

  • US 4,051,726 A
  • Filed: 04/06/1976
  • Issued: 10/04/1977
  • Est. Priority Date: 04/06/1976
  • Status: Expired due to Term
First Claim
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1. A liquid level indicating device comprising:

  • a transparent rod which is capable of being inserted into a container holding a liquida plurality of infrared emitters and photosensors within the transparent rod wherein a photosensor is placed sufficiently distant from the rod surface and an infrared emitter so as to collect a narrow band of infrared rays which are all totally reflected when the emitter-sensor pair is in air and to collect only rays which are not totally reflected when the emitter-sensor pair is immersed in a liquid;

    a substrate with conductive paths embedded within the transparent rod which provide for the means to drive the infrared emitters with electric current and provide the output path for sensing current from the photosensors; and

    a remote viewing device whereby the level of the liquid in the container is indicated by selective illumination of visible light emitting diodes in a remote viewing device.

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