Advanced phase correction approach to obtain radiometric calibrated spectra of the optically well-balanced balloonborne Fourier transform spectrometer MIPAS-B2

Details Advanced phase correction approach to obtain radiometric calibrated spectra of the optically well-balanced balloonborne Fourier transform spectrometer MIPAS-B2 Advanced phase correction approach to obtain radiometric calibrated spectra of the optically well-balanced balloonborne Fourier transform spectrometer MIPAS-B2

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999spie.3756...17t&link_type=abstract

Proc. SPIE Vol. 3756, p. 17-24, Optical Spectroscopic Techniques and Instrumentation for Atmospheric and Space Research III, All

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The balloon borne IR-Fourier transform spectrometer (FTS) MIPAS-B2 has been designed for a low self-emission from each of the instrument ports leading to low noise signals and a radiometrically balanced interferometer. The radiometric accuracy depends strongly on the quality of the phase correction of interferograms and of the calibration measurements and algorithms. It could be observed that the classically derived phases of the complex spectra are in correlation with line structures in the spectrum and cause disturbed calibrated spectra. These phase functions cannot be explained by the instrumental phase due to the beamsplitter nor by sampling shifts but by the emission of the beamsplitter itself. The determination of the instrumental phase function requires to invent an unconventional technique. According to the low radiance received from the stratosphere noise has also to be taken into account, especially in case of single non- coadded spectra. Therefore an advanced statistical method was investigated to derive the phase of the interferogram by minimizing the correlation of the real and imaginary part of the spectrum as well as the variance of the imaginary part (the beamsplitter spectrum). The complete processing and calibration scheme of the FTS-emission sounder will be presented focusing on a detailed description of phase behavior due to the beamsplitter emission and of the correction process.

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