Chopper for staring infrared systems
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United States of America Patent
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-
Oct 23, 1990
Grant Date -
N/A
app pub date -
Jul 28, 1988
filing date -
Jul 28, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Incident infrared radiation is focussed through a rotatable disk of germam onto a detector array. The disk has a thickness many times the wavelengths of the incident radiation and is partly covered with a pattern of germanium one-half wavelength of some preselected wavelength of the incident radiation. The pattern is a regular array of mesas, and acts as a phase grating which diffracts incident radiation. The diffracted (or blurred) image on the detector array is used as a reference level for background suppression.
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