Infrared sensor and imager with differential ferroelectric cells
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United States of America Patent
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May 2, 2006
Grant Date -
Apr 7, 2005
app pub date -
Oct 6, 2004
filing date -
Oct 6, 2003
priority date (Note) -
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Abstract
A pyrometer cell comprises a first ferroelectric capacitor, a second ferroelectric capacitor, and a difference circuit for determining the difference between the polarization charge, voltage, or current between the first and second ferroelectric capacitors. The cell is pulsed a plurality of times and an integrator circuit connected to the difference circuit provides an enhanced output signal representative of the integrated difference. An infrared imager is formed by an array of the pyrometer cells, with one ferroelectric capacitor in each cell exposed to an infrared source and the other ferroelectric capacitor not exposed to the infrared source.
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