论文部分内容阅读
纯转动拉曼测温激光雷达中采用双光栅单色仪结构的优点是能提供优于10-7抑制比,能够很好地抑制瑞利-米氏散射,得到纯度很高的转动拉曼谱,并且能够提高光的透射率,具有长期稳定性,但双光栅单色仪的光路结构复杂一直是系统中的难点。首先对两种光栅光路结构进行讨论,得出光纤对称式光栅光路结构对于光栅效率的利用要优于光纤直线排列式光路结构,并通过对光栅公式和转动拉曼光谱公式结合,推导出光栅闪耀级次和衍射角关系方程。当光栅常数为600line/mm时,其第5级为最佳闪耀级次。
The advantage of double raster monochromator structure in purely rotating Raman temperature-measuring lidar is that it can provide better than 10-7 inhibition ratio, can well restrain Rayleigh-Mie scattering and obtain high purity Raman spectrum , And can improve the light transmittance, with long-term stability, but double grating monochromator optical structure of the complexity has been a system of difficulties. First of all, we discuss the optical structure of the two kinds of grating. The conclusion is drawn that the optical path structure of the optical fiber symmetrical grating is better for the grating efficiency than the optical fiber linear arrangement optical path structure and the combination of grating formula and rotational Raman spectrum formula Order and diffraction angle relationship equation. When the grating constant is 600line / mm, the fifth level is the best one.