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 3rd-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.
| Original language | English |
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| Pages (from-to) | 142-151 |
| Number of pages | 10 |
| Journal | Proceedings of SPIE - The International Society for Optical Engineering |
| Volume | 3753 |
| State | Published - 1999 |
| Event | Proceedings of the 1999 Imaging Spectrometry V - Denver, CO, USA Duration: Jul 19 1999 → Jul 21 1999 |