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Dynamically-activated optical instrument for producing control signals having a self-calibration means

  • US 5,442,168 A
  • Filed: 01/06/1993
  • Issued: 08/15/1995
  • Est. Priority Date: 10/15/1991
  • Status: Expired due to Term
First Claim
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1. A self-calibratable controller for controlling a device upon detecting an object in an environment, comprising:

  • a) activatable radiation means for sensing radiation in the environment and generating an output indicative of the sensed radiation; and

    b) control means responsive to the output of the activatable radiation means and having a regulatable sensitivity, said control means including;

    i) self-calibration means for calibrating the controller to operate in the environment, including means for activating the radiation means to sense radiation in the environment in a self-calibration state in which the object is absent from the environment;

    ii) means for determining a reference paramenter indicative of the radiation sensed in the self-calibration state;

    iii) operating means for maintaining the radiation means activated to sense radiation in the environment in an operating state in which the object is present in the environment;

    iv) said determining means being further operative for determining a sensing paramenter indicative of the radiation sensed in the operating state;

    v) means for comparing the reference and sensing parameters, and for responsively generating an output control signal to control the device; and

    vi) means for regulating the sensitivity of the control means to the output of the radiation means during the self-calibration state.

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