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Proceedings Paper

Coded-aperture devices for viewing extended objects from space
Author(s): Charles C. Curtis; Ke Chiang Hsieh; Bill R. Sandel; Virginia Ann Drake
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Paper Abstract

In a comparison paper, one of us (Curtis) discusses the development of aperture codes appropriate for instruments viewing an extended object--in this case, the earth's magnetosphere. The magnetosphere becomes an extended object when viewed at close enough range to extend laterally beyond the field of view (FOV) of a sensor which is imaging it. The imaging particles are UV photons or energetic neutral atoms (ENA), the latter created from magnetospheric ions after charge-exchange interactions with exospheric gas. Here we describe coded aperture sensors for photons or ENA which incorporate FOV limiters and subdivide the object field into a number of elements which is smaller than the number of detector pixels. A least squares fit to the data is made in reconstructing the object field. To test the performance of a sensor, it is necessary to simulate an object of relatively large angular width which exhibits no parallax effects when seen by different elements of the detector. To evaluate the optics and reconstruction algorithms, two 'breadboard' sensors have been constructed, one based upon a film camera and the other upon a UV-light sensitive microchannel plate detector system. Laboratory tests of these sensors are described.

Paper Details

Date Published: 1 June 1992
PDF: 10 pages
Proc. SPIE 1744, Instrumentation for Magnetospheric Imagery, (1 June 1992); doi: 10.1117/12.60587
Show Author Affiliations
Charles C. Curtis, Univ. of Arizona (United States)
Ke Chiang Hsieh, Univ. of Arizona (United States)
Bill R. Sandel, Univ. of Arizona (United States)
Virginia Ann Drake, Univ. of Arizona (United States)

Published in SPIE Proceedings Vol. 1744:
Instrumentation for Magnetospheric Imagery
Supriya Chakrabarti, Editor(s)

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