Development of spectroscopic system for the measurements of stratospheric OClO and BrO

研制了一种自动光栅光谱仪，可应用天顶天空技术测量平流层中的OClO和BrO。单色仪具有F4.2的视野，使用68x68毫米，2400格罗夫/毫米光栅。探测器是一个9804光电倍增管，其增益通过改变高压在2x105的范围内调整。波长扫描是通过使用由步进电机驱动的正弦杆机构旋转光栅来实现的。当前测试覆盖的波长范围为430-502 nm。处理使用432到500nm的光谱。拟合的截面为NO_2， O_3, H_2O，环效应，瑞利散射和O_4， NO_2和O_3的柱量，精度为1%。从观测到的总吸收中减去后的剩余吸收小于0.1%。这满足了检测OClO和BrO的必要条件。

An automated grating spectrometer has been developed for possible measurements of OClO and BrO in the stratosphere by zenith sky technique. The monochromator has a field of view of F4.2 using a 68x68 mm, 2400 grove/mm grating. The detector is a 9804 photomultiplier and its gain is adjusted over a range of 2x105 by varying the high voltage. Wavelength is scanned by rotating the grating using a sine bar mechanism driven by a stepping moror. The wavelength region covered is 430-502 nm for the current tests. Processing uses 432 to 500 nm of this spectrum. The cross sections fitted are NO_2, O_3, H_2O, Ring effect, Rayleigh scattering and O_4, NO_2 and O_3 column amounts have been determined with 1 % precision. Residual absorption after subtraction from the observed total absorption is less than 0.1 %. This fulfillls necessary condition for the detection of OClO and BrO.