Rotational Modulation as an Alternative to Coded Aperture Imaging for Gamma Ray Astronomy

Details Rotational Modulation as an Alternative to Coded Aperture Imaging for Gamma Ray Astronomy Rotational Modulation as an Alternative to Coded Aperture Imaging for Gamma Ray Astronomy

Feb 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010head...11.4809c&link_type=abstract

American Astronomical Society, HEAD meeting #11, #48.09; Bulletin of the American Astronomical Society, Vol. 41, p.741

Computer Science

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Scientific paper

A rotational modulator (RM) gamma ray imager is capable of obtaining significantly better angular resolution than the fundamental geometric resolution defined by the ratio of detector dimension to mask-detector separation. An RM imager consisting of a single grid of absorbing slats rotating ahead of an array of a small number of non-imaging detectors has the advantage of fewer detector elements (i.e., detector plane pixels) than required by a coded aperture telescope with comparable angular resolution. A LaBr_3-based RM prototype developed in our laboratory at LSU uses the time profiles generated on the detector array by the rotating grid to image sources. A novel image reconstruction technique makes it possible to deconvolve the raw images, remove sidelobes, reduce the effects of noise, and provide resolving power a factor of 6-8 times better than the geometric resolution. We describe the technique, demonstrate the measured performance of the prototype instrument, and describe the prospects for applying the technique to a large-area hard x-ray/low energy gamma ray imaging mission.

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