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Title: Back focal component calibration of Ultraviolet Imaging Telescope (UVIT) on board ASTROSAT
Authors: Suresh Narra, Venkata
Issue Date: Aug-2010
Publisher: Indian Institute of Astrophysics
Citation: M. Tech. Thesis, University of Calcutta, Calcutta
Abstract: Ultraviolet Imaging Telescope (UVIT) is one of the five science payloads on ASTROSAT, UVIT observes simultaneously in Far Ultraviolet (FUV), Near Ultraviolet (NUV), and visible (VIS) bands. In addition to wide field high angular resolution imaging in UV, ASTROSAT aims to observe simultaneously in X-rays and UV well. UVIT is designed to achieve a sensitivity of 20 mag in FUV in 1000s observation, and a time resolution <1 s. The field of view of UVIT is nearly 29 arcmin. Images are made in FUV and NUV with a resolution better than 1.8"; whereas the resolution of images in VIS is nearly 2.2". UVIT has a total of three detector units, one for each band. They allow imaging in two dimensions. Each detector unit consists of a micro channel plate (MCP) system with CMOS image readout. Electronic gating is used to control the exposure time or void the over exposure. Both the FUV and NUV channels are operated in the photon counting (PC) mode and the VIS channel in integration mode. Attaining the design specifications during the operation of the mission depends upon the working of the individual components of the telescope as well as the coordination between various components. Also, it depends upon the calibration of the components on ground and in orbit. In-orbit calibrations should continue throughout the mission, time to time to maintain the design standards as well obtaining optimum performance of the mission. To get the optimum results from the mission it is necessary to well calibrate all the mission components especially the detector system. The calibration of the detector system involves many tests, among those the following tests were done as part of my M.Tech project. I. Calibration of both Engineering Model (EM) as well as Flight Model (PM) Gratings of UVIT. 2. Determination of Quantum Efficiency ofUVIT FM Detector Modules. 3. Determination of spatial sensitivity variations of EM Detector
Description: Restricted Access
Thesis Supervisor Dr. C. S. Stalin
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Appears in Collections:Integrated M.Tech-Ph.D (Tech.)

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