Fine optical focusing of 1610 nm channel of CO2spectrometer
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摘要:基于能量集中度的装调方法采用一套由可调谐 器、积分球、平行光管和数据采集处理软件等组成的精细定焦系统,以确定CO 2探测仪1 610 nm通道光谱仪的最佳焦面位置并完成探测器的精确安装,以像元光谱响应曲线(ILS)的全高半宽度(FWHM)作为聚焦评价函数,通过调整探测器方位遍历搜寻该函数最小值并作为正焦的最终评价依据,进而完成光谱仪的精细定焦任务。定焦结果显示:探测器获得的光谱响应曲线平均半宽度为0.128 1 nm,与理论值吻合良好。该系统不仅操作简单、结构紧凑且具有较高的定焦精度,也为光谱仪定标等后续工作提供了实验保障。Abstract:In order to establish the best focal plane for the 1610nm channel of CO 2spectrometer and install the HgCdTe detector accurately, the fine focusing system, which consists of tunable laser, integrating sphere, collimator and processing software, etc, is adopted in a assembly and adjusting method based on focus energy concentricity. The focusing evaluation function of the system is based on the full width at half maximum(FWHM) of instrument line shape(ILS). During the experiment, the orientation of the detector is adjusted search to the minimum value of the focusing evaluation function, and this minimum is as final evaluation basis of positive focal plane, and fine focusing works of the spectrometer is completed finally. The results show that the average value of FWHM of ILS is 0.128 1 nm, which coincides with the theoretical number. The focusing system is simple, compact and precise, which can provides experimental guarantee for the spectral calibration.
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Key words:
- CO2spectrometer/
- ILS/
- FWHM/
- precise alignment/
- focus evaluation function
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图 3不同狭缝像宽度下的光谱响应曲线
Figure 3.Spectral response curve under different width of slit image
图 5光谱仪定焦系统原理图
Figure 5.Schematic of system establishing best focal plane of spectrometer
图 6光谱仪定焦系统软件界面
Figure 6.Data interface of system for establishing best focal plane for spectrometer
图 7光谱仪定焦系统实物
Figure 7.Photo of system for establishing best focal plane for spectrometer
表 1光谱仪定焦系统主要技术参数
Table 1.Parameters of system for establishing best focal plane of spectrometer
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