Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986spie..627..482n&link_type=abstract
IN: Instrumentation in astronomy VI; Proceedings of the Meeting, Tucson, AZ, Mar. 4-8, 1986. Part 2 (A87-36376 15-35). Bellingha
Astronomy and Astrophysics
Astronomy
4
Electronic Equipment, Fourier Transformation, Infrared Astronomy, Infrared Spectrometers, Infrared Telescopes, Numerical Control, Computer Systems Programs, Convolution Integrals, Data Acquisition, Real Time Operation
Scientific paper
A high resolving power, mid-IR, astronomical Fourier transform spectrometer has been developed for use at ground based telescopes. The spectrometer is designed to operate over a broad wavelength range from 10 to 500 microns, the specific range being defined by the choice of beamsplitter, filters and detector. The spectrometer employs a folded optics configuration in which a double-sided mirror moves on a linear carriage to produce a factor of four multiplication of optical path difference. This results in a compact instrument in which an unapodised resolution of 0.01/cm is achieved with a mirror translation of only 12.5/cm, and which can easily be mounted at the f/35 Cassegrain foci of IR telescopes. A major feature of the system is the ability to compute, display and monitor any part of a 32,768-point spectrum of a phase-corrected, single-sided interferogram in real time. This is accomplished by efficient Fourier transform routines which exploit the inherent symmetry properties of the interferogram.
Clark Thomas A.
Naylor David A.
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