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Inclination angle metering apparatus

  • US 5,392,112 A
  • Filed: 05/04/1994
  • Issued: 02/21/1995
  • Est. Priority Date: 03/11/1992
  • Status: Expired due to Term
First Claim
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1. An apparatus for metering an inclination angle with respect to a surface of a liquid, comprising:

  • a container for receiving said liquid;

    light projecting means for emitting a light beam;

    light receiving means;

    means for splitting said light beam from said projecting means into first and second beams, such that said first beam is incident on said light receiving means after being reflected by the surface of said liquid and said second beam is incident on said light receiving means without being reflected by the surface of said liquid; and

    means for determining said inclination angle based on an incident position of said first beam on said light receiving means and an incident position of said second beam thereon.

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