Telescope for X ray and gamma ray studies in astrophysics

Details Telescope for X ray and gamma ray studies in astrophysics Telescope for X ray and gamma ray studies in astrophysics

Oct 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993shsp.symp...33w&link_type=abstract

In its The 1993 Shuttle Small Payloads Symposium p 33-36 (SEE N94-19162 04-12)

Astronomy and Astrophysics

Astronomy

Gamma Ray Astronomy, Gamma Ray Telescopes, Scintillation Counters, X Ray Astronomy, X Ray Telescopes, Coders, Fresnel Lenses, Moire Fringes, Photodiodes, Radiation Sources, X Ray Sources

Scientific paper

Imaging of x-rays has been achieved by various methods in astrophysics, nuclear physics, medicine, and material science. A new method for imaging x-ray and gamma-ray sources avoids the limitations of previously used imaging devices. Images are formed in optical wavelengths by using mirrors or lenses to reflect and refract the incoming photons. High energy x-ray and gamma-ray photons cannot be reflected except at grazing angles and pass through lenses without being refracted. Therefore, different methods must be used to image x-ray and gamma-ray sources. Techniques using total absorption, or shadow casting, can provide images in x-rays and gamma-rays. This new method uses a coder made of a pair of Fresnel zone plates and a detector consisting of a matrix of CsI scintillators and photodiodes. The Fresnel zone plates produce Moire patterns when illuminated by an off-axis source. These Moire patterns are deconvolved using a stepped sine wave fitting or an inverse Fourier transform. This type of coder provides the capability of an instantaneous image with sub-arcminute resolution while using a detector with only a coarse position-sensitivity. A matrix of the CsI/photodiode detector elements provides the necessary coarse position-sensitivity. The CsI/photodiode detector also allows good energy resolution. This imaging system provides advantages over previously used imaging devices in both performance and efficiency.

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