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Wavelength calibration of a tunable spatial heterodyne spectrometer
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Paper Abstract

Spatial Heterodyne Spectroscopy (SHS) is a relatively novel interferometric technique similar to Fourier transform spectroscopy and shares design similarities with a Michelson Interferometer. An Imaging detector is used at the output of a SHS to record the spatially heterodyned interference pattern. The spectrum of the source is obtained by Fourier transforming the recorded interferogram. The merits of the SHS -its design, including the lack of moving parts, compactness, high throughput, high SNR and instantaneous spectral measurements - makes it suitable for space as well as ground observatories. The small bandwidth limitation of the SHS can be overcome by building it in tunable configuration (Tunable Spatial Heterodyne Spectrometer(TSHS)). In this paper, we describe the wavelength calibration of the tunable SHS using a Halogen lamp and Andor monochromator setup. We found a relation between the fringe frequency and the wavelength.

Paper Details

Date Published: 6 July 2018
PDF: 9 pages
Proc. SPIE 10702, Ground-based and Airborne Instrumentation for Astronomy VII, 107024V (6 July 2018); doi: 10.1117/12.2312454
Show Author Affiliations
K. Nirmal, Indian Institute of Astrophysics (India)
Univ. of Calcutta (India)
Sridharan R., Indian Institute of Astrophysics (India)
S. Sriram, Indian Institute of Astrophysics (India)
Suresh Ambily, Indian Institute of Astrophysics (India)
Joice Mathew, Indian Institute of Astrophysics (India)
Mayuresh Sarpotdar, Indian Institute of Astrophysics (India)
Jayant Murthy, Indian Institute of Astrophysics (India)
Binukumar Gopalakrishnan, Indian Institute of Astrophysics (India)
Margarita Safonova, M. P. Birla Institute of Fundamental Research (India)

Published in SPIE Proceedings Vol. 10702:
Ground-based and Airborne Instrumentation for Astronomy VII
Christopher J. Evans; Luc Simard; Hideki Takami, Editor(s)

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