Study On UV-VUV Radiometric Standard And High Presion Radiometric Calibration For Space Remote Sensing Instrument

With the development of space technology in our country, more and more remote sensing instruments have been sent into space. Ultraviolet and vacuum ultraviolet remote sensing instruments, which play a key role in the field of environmental monitoring, go into a high speed growing period. The demand for high precision radiometric calibration also become higher and higher correspondingly.In chapter 1, it is reviewed the research work of establishing UV-VUV spectral radiometric standards both domestically and abroad. Combining with the practical needs of developing project, the research content and general scheme are determined.In chapter 2, according to Schwinger theory, the spectral radiant distribution of synchrotron radiation emitted by Hefei 800Mev electron storage ring is calculated. Based on the accurate measurement of relative parameters of storage ring, the transfer standard—deuterium lamp was calibrated in 115～300nm. And the obtained radiance values of the D2 lamp have been compared with the valves derived from BESSY II synchrotron radiation of German National Institute of Science and Technology for Metrology (PTB), from 164 to 300 nm, the D2 lamp absolute spectral radiance from different SR standards have a discrepancy within ±20%. A detailed analysis of the contributions to the calibration uncertainty points out that the major part of it is caused by the presently uncertain knowledge of the polarization properties of the radiometric instrumentation.In chapter 3, the radiometric characteristics of UV integrating sphere system is investigated. It has been proved that sphere illuminated by the Xenon lamp has good lambertian qualities, and can be used as large area radiance calibration source in UV range. In chapter 4, the integrating sphere calibration technique is employed to eliminate the influence of diffuser's BRDF measurement. The radiance calibration uncertainty is reduced from 4.6% previously to 2.8% currently; the high precision spectral radiance calibration is achieved.In 250～340nm, the discrepancy between the radiance responsivities obtained using sphere and flat diffuser techniques is less than ±3%. Utilizing the property of...