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FILL LEVEL MEASURING DEVICE

  • US 3,741,656 A
  • Filed: 05/27/1971
  • Issued: 06/26/1973
  • Est. Priority Date: 05/27/1971
  • Status: Expired due to Term
First Claim
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1. Apparatus for measuring the level of a substance in a container, comprising:

  • means disposed above the container for emitting a light beam which strikes the substance;

    part of said light beam being specularly reflected from the surface of the substance, another part being scattered from an incident point on the surface of the substance and yet another part being transmitted through the substance and being scattered from an incident point on the bottom of the container;

    said last memtioned light being effective for providing a virtual image of the incident point on the bottom of the container; and

    means for determining the relative positions of the incident point on the surface of the substance, the incident point on the bottom of the container and the virtual image of said last mentioned point, said positions being a measure of the level of the substance in the container.

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