A modular Fabry-Perot interferometer system for imagery and spectrometry

Details A modular Fabry-Perot interferometer system for imagery and spectrometry A modular Fabry-Perot interferometer system for imagery and spectrometry

Oct 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jrasc..76..277r&link_type=abstract

Journal of the Royal Astronomical Society of Canada, vol. 76, Oct. 1982, p. 277-302. In French. Research supported by the Natur

Astronomy and Astrophysics

Astronomy

2

Astronomical Spectroscopy, Fabry-Perot Interferometers, Fabry-Perot Spectrometers, Design Analysis, H Ii Regions, Microcomputers, Radial Velocity, Spectral Line Width

Scientific paper

A portable microcomputer controlled Fabry-Perot interferometer system operating in the imaging and spectrophotometer modes has been built to obtain radial velocity field maps and photoelectric line profiles of galactic and extragalactic H II regions. Piezoscanning is achieved by using capacitance micrometry to detect deviations from parallelism and absolute spacing changes. A 183 mm focal length f/8 collimator is used in the imaging mode, and the reimaging of the field is accomplished using a 25 mm, f/0.95 fast lens. Design parameters in the spectrophotometer mode include an exit diaphragm which selects the central interference fringe of emission, and a Fabry lens which images the primary mirror of the telescope on the GaAs photocathode of the photomultiplier. Scanning and data acquisition are controlled with a HP-85 microcomputer. Observations reveal that radial velocity measurements rarely differ more than plus or minus 2 km/sec in relation to recorded values.

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