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Pyroelectric sensor

  • US 20070108385A1
  • Filed: 02/20/2004
  • Published: 05/17/2007
  • Est. Priority Date: 02/21/2003
  • Status: Active Grant
First Claim
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1. A pyroelectric sensor system comprising:

  • an alternating voltage source generating an alternating voltage at a predetermined frequency;

    a pyroelectric scene element responsive to the alternating voltage, said scene element generating a hysteresis loop charge output in response to the alternating voltages, said alternating voltage driving the scene element over at least a portion of the hysteresis loop output of the scene element, said scene element being constructed and arranged so that the alternating voltage causes a polarization reversal of dipoles in the scene element in response to positive and negative changes of the alternating voltage;

    a charge integration system responsive to the charge output from the scene element, said integration system determining the area within the hysteresis loop defined by the hysteresis loop output and generating a signal indicative of the charge output from the scene element; and

    a ferroelectric layer of the scene element being selected from a group consisting of strontium-bismuth-tantalate (SBT), barium-bismuth-tantalate, and lanthium-bismuth-tantalate.

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