element is a temperature dependent capacitor, the capacitance of which
changes in direct proportion to how much infrared radiation it senses. This is
termed an uncooled focal plane array (UFPA). An electrically heated element
maintains a temperature of 10°C inside the UFPA, enabling it to operate
between ambient temperatures of 40 and 85°C.
Between the lens and the bank of UFPA sensor elements there is a thin silicon
disc rotated by an electric motor at 1800 rpm. Helical swirls are etched on
some segments of the disc. Infrared radiation is blocked by the swirls but
passes straight through the plain segments. The UFPA elements respond ...
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