Terrestrial sensor device for satellite or the like
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United States of America Patent
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Dec 17, 1996
Grant Date -
N/A
app pub date -
Aug 14, 1995
filing date -
Aug 16, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The terrestrial sensor device is suitable for use on a satellite or spacecraft. It has a lens for forming an image of the Earth in a focal plane, and a sensor placed in the focal plane. The sensor is constituted by a two-dimensional array of pyroelectric detectors. The device also includes an actuator for oscillating the array in the focal plane, orthogonally to the optical axis of the image-formation lens, at a determined frequency and with an amplitude at least equal to the distribution spacing of the detectors and a processing circuit for acquisition of the output signals of the detectors at the oscillation frequency and for comparison of the output signals with a threshold.
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