Research on Spectral Calibration of ASD Spectrometer Using Atmospheric Absorption Profiles

ASD spectrometers have been well conducted field spectral calibration by using absorption features of atmospheric profile in this paper. First, set the spectral radiant spectrum which generated by MODTRAN5 radiative transfer model, a reference spectral line is produced by making the spectral radiant spectrum convolved with the spectral response function of each channel. Meanwhile, in the same atmospheric condition(the same observation target, the sun elevation angle, azimuth, aerosol distribution, composition and concentration distribution of atmosphere..etc), the white diffuser plate is measured by the ASD spectrometer and observed spectral line is acquired. The best spectral matching algorithm is used to compare the observed spectral line with the reference spectral one. Central wavelength of the ASD spectrometer is obtained by calculating the results of matching spectrum shifts within feature spectrum ranges. An accuracy analysis is put forward in the last of the paper.