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Optical sensors and optical fibre networks for such sensors

  • US 5,062,686 A
  • Filed: 09/23/1988
  • Issued: 11/05/1991
  • Est. Priority Date: 11/27/1986
  • Status: Expired due to Fees
First Claim
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1. An optical sensor comprising:

  • elongate light transmission means;

    lens means of at least substantially half-pitch length, positioned with one of its focal planes substantially at a mouth of the light transmission means to receive and focus a diverging cone of light emergent therefrom;

    reflector means substantially at another focal plane of said lens means to reflect said focused light back to said mouth of the light transmission means; and

    detection means in the path of said light between said mouth and said reflector means, said detection means being responsive to an external condition to influence said diverging cone of light.

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