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Proceedings Paper

Technique And Advantages Of Using Multiple Zone Apertures In Fabry-Perot Spectroscopy
Author(s): K. C. Sahu; J. N. Desai; M Srinivasan; R. Gupta
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Paper Abstract

This paper presents a novel technique developed to increase the throughput of a Fabry-Perot spectrometer using a multiple zone aperture -(MZA). The method can very advantageously be used for study of line profiles from faint, extended objects. The description includes the use of a centrally masked MZA which, apart from increasing the throughput of the spectrometer, can suppress the radiation from any continuum source that may be present at the center. Detection of nebulosity around stars is one important area which can greatly be benefitted by this technique. The main hindrances in the detection of nebulosity are: (i) the faintness of the nebulosity, (ii) the uncertainty in its location and (iii) the stellar continuum radiation. Since the use of a centrally masked MZA (i) increases the throughput of the spectrometer, (ii) makes the search area circularly symmetric and (iii) suppresses the stellar continuum radiation, this forms an ideal technique for the purpose. The method has successfully been tested in the laboratory and the results of the laboratory tests are also presented.

Paper Details

Date Published: 13 October 1986
PDF: 10 pages
Proc. SPIE 0627, Instrumentation in Astronomy VI, (13 October 1986); doi: 10.1117/12.968072
Show Author Affiliations
K. C. Sahu, Institut d'Astrophysique (France)
J. N. Desai, Physical Research Laboratory (India)
M Srinivasan, Physical Research Laboratory (India)
R. Gupta, Physical Research Laboratory (India)

Published in SPIE Proceedings Vol. 0627:
Instrumentation in Astronomy VI
David L. Crawford, Editor(s)

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