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Proceedings Paper

Compensation for optical distortion in Fourier transform spectrometers
Author(s): Daniel N. Harres; Daniel R. Fuhrmann; William Hayden Smith
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Paper Abstract

A calibration method for determining and correcting the optical distortion in the spectral axis of a Fourier Transform spectrometer is proposed. In our method, a narrowband optical calibration source is used, and the resulting interferogram is treated as a sinusoid which is phase-modulated as a result of the optical distortion. A discrete-time quadrature demodulator is used to determine the phase modulation, and the distortion is then characterized using a third-order polynomial fit to this estimated phase. Correction of interferogram data is accomplished by resampling the discrete data onto a uniform grid in the predistortion space. Our method has been applied to calibration data from the Digital Array Scanned Interferometer (DASI), with excellent results.

Paper Details

Date Published: 27 October 1999
PDF: 10 pages
Proc. SPIE 3753, Imaging Spectrometry V, (27 October 1999); doi: 10.1117/12.366276
Show Author Affiliations
Daniel N. Harres, Boeing North American, Inc. (United States)
Daniel R. Fuhrmann, Washington Univ. (United States)
William Hayden Smith, Washington Univ. (United States)

Published in SPIE Proceedings Vol. 3753:
Imaging Spectrometry V
Michael R. Descour; Sylvia S. Shen, Editor(s)

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