Physics – Optics
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992spie.1744..138c&link_type=abstract
Proc. SPIE Vol. 1744, p. 138-147, Instrumentation for Magnetospheric Imagery, Supriya Chakrabarti; Ed.
Physics
Optics
1
Scientific paper
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.
Curtis Charles C.
Drake Virginia A.
Hsieh K. C.
Sandel Bill R.
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