Calibrating the HXMT collimators using diffuse illumination

Details Calibrating the HXMT collimators using diffuse illumination Calibrating the HXMT collimators using diffuse illumination

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010scchg..53s..36h&link_type=abstract

Science China Physics, Mechanics and Astronomy, Volume 53, Issue 1, pp.36-39

Astronomy and Astrophysics

Astronomy

Hxmt, Collimator, Point Spread Function, Monte Carlo Simulation, Diffuse Illumination

Scientific paper

We propose a new method to calibrate the HXMT collimators by measuring the optical point spread function (PSF) of the hard X-ray modulation telescope (HXMT). The light transmission of the collimator at different viewing angles with a camera and a diffuse backlight placed behind the collimator is measured. This method is much easier to accomplish than measuring the PSF with a parallel optical beam. The experimental results are very consistent with the simulations. The PSF of the collimator of the high energy X-ray telescope on HXMT is found to be in good agreement with the design, with accuracy better than 1 arcmin.

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