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Proceedings Paper

Basic and advanced Fourier telescope performance for imaging the sky in hard x rays
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Paper Abstract

Presently, a Fourier telescope design is flying on the Japanese Solar-A satellite providing hard x-ray images of the Sun. Fourier designs are presently being considered for the next generation of high energy observing instruments (e.g., HESP). Hard x-rays (10-500 ke V) are produced by solar flares and cosmic sources such as the Crab nebula. Imaging these x-rays will allow insight to be gained as to processes at work in these energetic sources. Hard xrays, while not imageable by conventional means, may be imaged by Fourier telescopes. In this paper, an advanced rotating modulation collimator (RMC) design using several spatial frequencies is numerically modeled and examined using an end-to-end photon counting simulation. It is then compared to two basic Fourier telescopes measuring only two spatial frequencies, a spatial modulation collimator (SMC) and a RMC. While the more advanced telescope provided better images, diminishing improvement with more spatial frequencies for simple sources is clearly indicated. In addition, a tradeoff was identified for low flux sources in that for simple sources the basic telescope required fewer photons to achieve a stable image than did the more advanced version.

Paper Details

Date Published: 19 November 1993
PDF: 18 pages
Proc. SPIE 2006, EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy IV, (19 November 1993); doi: 10.1117/12.162835
Show Author Affiliations
Jonathan W. Campbell, NASA Marshall Space Flight Ctr. (United States)


Published in SPIE Proceedings Vol. 2006:
EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy IV
Oswald H. W. Siegmund, Editor(s)

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