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Remote passive temperature sensor

  • US 4,762,426 A
  • Filed: 12/19/1986
  • Issued: 08/09/1988
  • Est. Priority Date: 12/19/1986
  • Status: Expired due to Fees
First Claim
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1. A non-electrical, optically read condition sensor apparatus for determining the condition at a remote location by transmitting a radiant energy beam to the remote location and measuring a reflected return beam, the apparatus comprising in combination:

  • a local ground instrument comprising;

    means for generating an interrogation beam of radiant energy;

    means directing said interrogation beam to a remotely located corner-cube sensor; and

    ,return radiation sensing means for sensing the intensity of the reflected returned beam;

    a passive, unpowered, remotely located corner cube sensor means comprising;

    a reflective corner cube having a plurality of adjoining reflective faces at right angles to each other;

    a condition sensing area on one of said reflective corner cube faces, said sensing area including condition responsive bi-level film cantilever member means forming a part of said condition sensing area, said bi-level film cantilever member means consisting of two different materials which have different expansion coefficients whereupon as the condition changes the bi-level film cantilever member means bends to a degree dependent on the amount of change of the condition sensed and thus deflects more or less of the return radiation away from the local ground instrument.

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