Tests and calibration on ultra violet imaging telescope (UVIT)

Amit Kumar; S. K. Ghosh; P. U. Kamath; Joe Postma; S. Kathiravan; P. K. Mahesh; S. Nagbhushana; K. H. Navalgund; N. Rajkumar; M. N. Rao; K. S. Sarma; S. Sriram; C. S. Stalin; S. N. Tandon

doi:10.1117/12.924147

17 September 2012 Tests and calibration on ultra violet imaging telescope (UVIT)

Amit Kumar, S. K. Ghosh, P. U. Kamath, Joe Postma, S. Kathiravan, P. K. Mahesh, S. Nagbhushana, K. H. Navalgund, N. Rajkumar, M. N. Rao, K. S. Sarma, S. Sriram, C. S. Stalin, S. N. Tandon

Author Affiliations +

Proceedings Volume 8443, Space Telescopes and Instrumentation 2012: Ultraviolet to Gamma Ray; 84434R (2012) https://doi.org/10.1117/12.924147
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

Abstract

Ultra Violet Imaging Telescope on ASTROSAT Satellite mission is a suite of Far Ultra Violet (FUV; 130 - 180 nm), Near Ultra Violet (NUV; 200 - 300 nm) and Visible band (VIS; 320-550nm) imagers. ASTROSAT is a first multi wavelength mission of INDIA. UVIT will image the selected regions of the sky simultaneously in three channels & observe young stars, galaxies, bright UV Sources. FOV in each of the 3 channels is ~ 28 arc-minute. Targeted angular resolution in the resulting UV images is better than 1.8 arc-second (better than 2.0 arc-second for the visible channel). Two identical co-aligned telescopes (T1, T2) of Ritchey-Chretien configuration (Primary mirror of ~375 mm diameter) collect the celestial radiation and feed to the detector system via a selectable filter on a filter wheel mechanism; gratings are available in the filter wheels of FUV and NUV channels for slit-less low resolution spectroscopy. The detector system for each of the 3 channels is generically identical. One telescope images in the FUV channel, and other images in NUV and VIS channels. One time open-able mechanical cover on each telescope also works as Sun-shield after deployment. We will present the optical tests and calibrations done on the two telescopes. Results on vibrations test and thermo-vacuum tests on the engineering model will also be presented.

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Amit Kumar, S. K. Ghosh, P. U. Kamath, Joe Postma, S. Kathiravan, P. K. Mahesh, S. Nagbhushana, K. H. Navalgund, N. Rajkumar, M. N. Rao, K. S. Sarma, S. Sriram, C. S. Stalin, and S. N. Tandon "Tests and calibration on ultra violet imaging telescope (UVIT)", Proc. SPIE 8443, Space Telescopes and Instrumentation 2012: Ultraviolet to Gamma Ray, 84434R (17 September 2012); https://doi.org/10.1117/12.924147

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