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Electro-mechanical transducer

  • US 4,214,485 A
  • Filed: 06/07/1978
  • Issued: 07/29/1980
  • Est. Priority Date: 06/07/1978
  • Status: Expired
First Claim
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1. An electro-mechanical transducer comprising:

  • a container;

    a liquid partially filling said container thereby defining a liquid surface therewithin;

    a source of electromagnetic radiation mounted with respect to said container so as to illuminate at least a portion of the interior thereof;

    an electromagnetic radiation detection means responsive to said source, mounted with respect to said container so as to detect radiation after interaction with said liquid surface within said container, movement of said container causing the output of said detection means to vary as a result of the changing transmissive and refractive properties of said liquid surface; and

    means for directing the radiation from said source so that substantially all of the radiation passes at least once through said liquid surface before impinging on said detection means.

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