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报道了一套适用于激光外差辐射计的高精度太阳跟踪仪,为激光外差辐射计提供用以反演大气成分的柱浓度和垂直廓线的太阳光。太阳跟踪系统采用太阳运行轨迹跟踪与光电跟踪相结合的跟踪方式,具有精度高、全时空特点。测量了该太阳跟踪仪的跟踪精度,X和Y轴方向跟踪精度分别达到0.068°和0.06°,能够满足激光外差辐射计在大气和天文领域中对太阳光收集的要求。进而把太阳跟踪仪与实验室研制的激光外差辐射计集合起来,测量了3.5μm附近的太阳光谱,得到了CH4在整层大气中的吸收情况,为下一步反演整层大气中CH4的柱浓度和垂直廓线奠定了基础。
A high-precision solar tracker for a laser heterodyne radiometer is reported to provide the laser heterodyne radiometer with sunlight in a column concentration and vertical profile to retrieve atmospheric composition. Solar tracking system uses the sun tracking and optical tracking combined with the tracking method, with high precision, full-time features. The tracking accuracy of the solar tracker was measured and the tracking accuracy in the X and Y axis directions was 0.068 ° and 0.06 °, respectively. It can meet the requirements of the laser heterodyne radiometer in the atmospheric and astronomical fields. And then the solar tracker and laboratory developed laser heterodyne radiometer to gather together to measure the solar spectrum near 3.5μm, get CH4 absorption in the whole atmosphere, for the next step to retrieve the whole atmosphere of CH4 Column concentration and vertical profile laid the foundation.