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Pre-Launch Spectral Calibration of the Absorbed Aerosol Sensor
Version 1
: Received: 15 September 2023 / Approved: 15 September 2023 / Online: 15 September 2023 (08:57:25 CEST)
A peer-reviewed article of this Preprint also exists.
Mao, J.; Wang, Y.; Shi, E.; Wang, J. Pre-Launch Spectral Calibration of the Absorbed Aerosol Sensor. Sensors 2023, 23, 8590. Mao, J.; Wang, Y.; Shi, E.; Wang, J. Pre-Launch Spectral Calibration of the Absorbed Aerosol Sensor. Sensors 2023, 23, 8590.
Abstract
Spectral calibration consists of the calibration of wavelengths and the measurement of the instrument's spectral response function (SRF). Unlike conventional slits, the absorbed aerosol sensors (AAS) are used as a slit homogenizer, in which the spectral response function (SRF) is not a conventional Gaussian curve. To be more precise, the SRF is the convolution of the slit function of the spectrometer, the line spread function of the optical system, and the detector response function. The SRF of the slit homogenizer is a flat-topped multi-Gaussian function. Considering the convenience of fitting, a super-Gaussian function, which looks like a similar distribution to the flat-topped multi-Gaussian function, is used to fit the measured data in a spectral calibration. According to the results, the SRF’s shapes, due to the Earth port, resemble a Gaussian curve with a flatted top could be concluded, which contains an FWHM of 1.78–1.82 nm for the AAS. The results show that the correlation coefficients are about 0.99, which proves that the fitting function could better characterize the SRF of the instrument.
Keywords
Spectral calibration; spectral response function; absorbed aerosol sensors; slit homogenizer; slit function instrument
Subject
Environmental and Earth Sciences, Remote Sensing
Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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