Xue Qingsheng, Lu Fengqin, Duan Minzheng, Zheng Yuquan, Wang Xiaoheng, Cao Diansheng, Lin Guangyu, Tian Jiewen
Appl Opt. 2018 Aug 10;57(23):6823-6830. doi: 10.1364/AO.57.006823.
A new type of optical system comprising double-grating and double wave band spectrometers is designed for atmospheric detection. The optical system can bring oxygen A band (758-778 nm) and water vapor absorption band (758-880 nm) on a charge-coupled device (CCD) at the same time for ultrahigh resolution spectrum measurement. Each absorbed band with three observation directions of atmospheric radiation is imaged in different positions of a common CCD. The spectral resolution is less than 0.07 nm in oxygen A band (758-778 nm), and the spectral resolution is less than 0.28 nm in water vapor absorption band (758-880 nm). Three end faces of the optical fiber are on the slit plane for each wave band, and each end face corresponds to an observation angle. The optical fiber core diameter is 600 μm, the slit width is 25 μm, and the slit length is 18.4 mm. The principle of smile correction is analyzed. The smile of the Czerny-Turner double-grating spectrometer can be compensated by using the tilt field lens in front of the focal plane. The design results corroborate that the maximum smile of the double-grating spectrometer is 5 μm and that the approach of correcting smile is effective. The stray light is analyzed, and the approaches of suppressing the stray light are proposed.
设计了一种用于大气探测的新型光学系统，该系统由双光栅和双波段光谱仪组成。该光学系统可将氧气A波段（758 - 778纳米）和水汽吸收波段（758 - 880纳米）同时成像在电荷耦合器件（CCD）上，以进行超高分辨率光谱测量。每个吸收波段在大气辐射的三个观测方向下成像于同一个CCD的不同位置。在氧气A波段（758 - 778纳米），光谱分辨率小于0.07纳米；在水汽吸收波段（758 - 880纳米），光谱分辨率小于0.28纳米。每个波段的光纤的三个端面位于狭缝平面上，且每个端面对应一个观测角度。光纤芯径为600微米，狭缝宽度为25微米，狭缝长度为18.4毫米。分析了微笑校正原理。通过在焦平面之前使用倾斜场镜，可以补偿切尔尼 - 特纳双光栅光谱仪的微笑。设计结果证实双光栅光谱仪的最大微笑为5微米，且微笑校正方法有效。分析了杂散光，并提出了抑制杂散光的方法。
