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Programmable detection sensor with means to automatically adjust sensor operating characteristics to optimize performance for both high gain and low contrast applications

  • US 5,808,296 A
  • Filed: 03/22/1996
  • Issued: 09/15/1998
  • Est. Priority Date: 03/22/1996
  • Status: Expired due to Term
First Claim
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1. In a sensor including an emitter which emits a detection signal such that the detected signal can be blocked by or reflected from an object and a detection means having a variable gain amplifier for generating an electronic signal representing the presence, absence or condition of the object, the sensor being configured to perform a method for automatically adjusting the gain of the variable gain amplifier comprising the steps of:

  • determining the amplitude of said electronic signal in a first state at each of a plurality of gain settings;

    determining the amplitude of said electronic signal and a second state at the same plurality of gain settings;

    comparing the amplitude of said electronic signal and said first and second stage at each of said gain settings;

    and adjusting the gain of the variable gain amplifier to a gain setting based upon said comparison to maximize low contrast performance if the difference in amplitude in said first and second states is less than a predetermined value or maximize excess gain performance if said difference is equal to or greater than said predetermined value.

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