The Study On UV Panoramic Imaging System For Middle Atmosphere Sounding In Limb View

The earth is home for human survival, and the atmosphere is a barrier to protectthe earth. Space-based atmospheric remote sensing, which become the focus of theearth and space science, is the principal means of monitoring middle atmosphere.Through space-based atmospheric remote sensing on middle atmosphere to obtain thedistribution of trace gases on real-time, so the global atmospheric environment isgrasped and the environmental monitor of middle atmosphere be established. Limbviewing is a new viewing geometry which allows the vertical resolution similar tooccultation and the coverage similar to nadir viewing. Therefore limb viewingattracted intense attention of atmospheric researchers in the field of space-basedremote sensing.In this paper, according to the application requirement to monitor earth limbmiddle atmosphere on spatial platform, the three wavelength ultraviolet wavelengths(265nm,295nm,265nm) imaging analysis is realized by replacement of UV filters.So the ultraviolet band Omni-directional limb imaging detection in real time isachieved. Based on double reflective surface model and panoramic annular lensmodel, two types of UV panoramic limb imaging systems are designed. In addition,each optical surface is made of spherical surface, avoiding the use of aspheric surface,to reduce the difficulty of processing and alignment. The two systems realize the limb sounding of140.4°~144.8°vertical view and360°horizontal view. Theapplication results meet the requirements of various performances. Finally, the systemof panoramic annular lens model is chosen to be further developed in consideration ofits realization. Detector is selected by analyzing the earth limb atmosphere spectralradiation characteristics. Optical components requirements on processing areproposed, as well as the measurement method of the surface and curvature. Themechanical structure are designed and fabricated, and the date processing and the datecollecting software are programmed. Then the optical system, mechanical system andthe detector system are integrated to compose the UV panoramic limb imagingprototype. The methods of UV spatial resolution and UV high precision wavelengthcalibration are presented as well as the360°wide-field spectral radiance calibrationmethod. A field segmental spectral radiance calibration method is put forward to takeinto account such as the special waveband,360°annular field of view, and manyother factors. Study of the field segmental spectral radiance calibration method ismade using UV limb imager, the results shows that the method is feasible and reliable.Finally, the influencing factors and the value of spectral radiance calibrationuncertainty are analyzed.The development of the UV panoramic limb imaging for middle atmospheredetection break through the limitations that the field of previous limb viewing remotesensing instrument. It comes true that imaging the surrounding360°scene for middleatmospheric limb detection at one time without rotating the optical system. It enrichesthe information data of middle atmospheric limb detection and open up a new area forpanoramic imaging application. Besides, the development of the UV panoramic limbimaging provides technical foundations for the further engineering prototypedevelopment and applications of the limb imaging detection technology inspace-based atmosphere remote sensing in our country.