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Proceedings Paper

Divided-mirror scanning technique for a small Michelson interferometer
Author(s): William A. Gault; Stoyan I. Sargoytchev; Gordon G. Shepherd
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Paper Abstract

A method is described for obtaining four simultaneous phase- stepped images from a Michelson interferometer in order to measure the Doppler shift of a spectral line. One of the Michelson mirrors is divided into quadrants and each quadrant coated separately, so the path difference varies by about (lambda) /4 from one quadrant to another. An image of the mirrors is formed outside the interferometer, where the light from the quadrants is diverted in different directions, and four separate images of the field of view are formed, one for each quadrant. For a given direction in the field of view, the fringe is sampled at four points on the interferogram separated by (lambda) /4 and from these four intensities, the phase of the fringe is calculated. Doppler shifts of the spectral line are seen as changes in the phase of the fringe. In earlier versions of the imaging Doppler Michelson technique, the sampling was done in sequence. Simultaneous sampling eliminates the errors caused by intensity variations during the measurement, making the technique useful for rapidly varying sources such as aurora.

Paper Details

Date Published: 31 October 1996
PDF: 4 pages
Proc. SPIE 2830, Optical Spectroscopic Techniques and Instrumentation for Atmospheric and Space Research II, (31 October 1996); doi: 10.1117/12.256111
Show Author Affiliations
William A. Gault, York Univ. (Canada)
Stoyan I. Sargoytchev, York Univ. (Canada)
Gordon G. Shepherd, York Univ. (Canada)

Published in SPIE Proceedings Vol. 2830:
Optical Spectroscopic Techniques and Instrumentation for Atmospheric and Space Research II
Paul B. Hays; Jinxue Wang, Editor(s)

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