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Spatial heterodyne spectrometer and associated instrumentation for space and ground observatories a thesis submitted for the degree of doctor of philosophy (technology) department of applied optics and photonics, University college of technology, University of Calcutta

Nirmal, K

Spatial heterodyne spectrometer and associated instrumentation for space and ground observatories a thesis submitted for the degree of doctor of philosophy (technology) department of applied optics and photonics, University college of technology, University of Calcutta [Ph.D Thesis] K. Nirmal - Bangalore Indian Institute of Astrophysics 2018 - xxviii, 107p.

Ph.D. Thesis, University of Calcutta, Kolkata



We describe the development of compact, lightweight payloads suitable
for ground, space, and balloon-based observatories. The first instrument is
a compact high resolution (≥ 20000) tunable spatial heterodyne spectrom-
eter (TSHS). Spatial Heterodyne Spectroscopy (SHS) is a relatively novel

interferometric technique similar to the Fourier transform spectroscopy with
heritage from the Michelson Interferometer. An imaging detector is used at
the output of an SHS to record the spatially-heterodyned interference pat-
tern. The spectrum of the source is obtained by Fourier transforming the
recorded interferogram. Since these instruments do not have slits, the entire
incoming beam can be used to generate the spectrum. The small bandwidth

limitation of the SHS can be overcome by building it in a tunable config-
uration (TSHS). This instrument can be used to observe and study faint,
extended emission line targets by retrieving the high-resolution spectra from
the entire source.


Heterodyne Spectroscopy (SHS)
Instrumentation
Observatories

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