Coded-aperture devices for viewing extended objects from space

Charles C. Curtis; Ke Chiang Hsieh; Bill R. Sandel; Virginia Ann Drake

doi:10.1117/12.60587

1 June 1992 Coded-aperture devices for viewing extended objects from space

Charles C. Curtis, Ke Chiang Hsieh, Bill R. Sandel, Virginia Ann Drake

Proceedings Volume 1744, Instrumentation for Magnetospheric Imagery; (1992) https://doi.org/10.1117/12.60587
Event: San Diego '92, 1992, San Diego, CA, United States

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.

Citation Download Citation

Charles C. Curtis, Ke Chiang Hsieh, Bill R. Sandel, and Virginia Ann Drake "Coded-aperture devices for viewing extended objects from space", Proc. SPIE 1744, Instrumentation for Magnetospheric Imagery, (1 June 1992); https://doi.org/10.1117/12.60587

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available