The detectors used in the cryogenic limb-emission sounder MIPAS-B2 (Michelson Interferometer for Passive Atmospheric Sounding) show a nonlinear response, which leads to radiometric errors in the calibrated spectra if the nonlinearity is not taken into account. In the case of emission measurements, the dominant error that arises from the nonlinearity is the changing detector responsivity as the incident photon load changes. The effect of the distortion of a single interferogram can be neglected. A method to characterize the variable responsivity and to correct for this effect is proposed. Furthermore, a detailed error estimation is presented.
© 2006 Optical Society of America
(040.3060) Detectors : Infrared
(120.6200) Instrumentation, measurement, and metrology : Spectrometers and spectroscopic instrumentation
(300.6300) Spectroscopy : Spectroscopy, Fourier transforms
Instrumentation, Measurement, and Metrology
Anne Kleinert, "Correction of detector nonlinearity for the balloonborne Michelson Interferometer for Passive Atmospheric Sounding," Appl. Opt. 45, 425-431 (2006)