Compensation for optical distortion in Fourier transform spectrometers

Daniel N. Harres; Daniel R. Fuhrmann; William Hayden Smith

doi:10.1117/12.366276

27 October 1999 Compensation for optical distortion in Fourier transform spectrometers

Daniel N. Harres, Daniel R. Fuhrmann, William Hayden Smith

Proceedings Volume 3753, Imaging Spectrometry V; (1999) https://doi.org/10.1117/12.366276
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

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.

Citation Download Citation

Daniel N. Harres, Daniel R. Fuhrmann, and William Hayden Smith "Compensation for optical distortion in Fourier transform spectrometers", Proc. SPIE 3753, Imaging Spectrometry V, (27 October 1999); https://doi.org/10.1117/12.366276

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