Compensation for optical distortion in Fourier transform spectrometers

Details Compensation for optical distortion in Fourier transform spectrometers Compensation for optical distortion in Fourier transform spectrometers

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999spie.3753..142h&link_type=abstract

Proc. SPIE Vol. 3753, p. 142-151, Imaging Spectrometry V, Michael R. Descour; Sylvia S. Shen; Eds.

Computer Science

1

Scientific paper

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.

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