转动拉曼测温激光雷达的双光栅单色仪研究

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的抑制比,能够很好抑制Rayleigh-Mie散射,得到纯度很高的转动拉曼谱,并且能够提高光的透过率,具有长期的稳定性.光纤、透镜、光栅参数的选择及焦板上光斑的精确定位是双光栅单色仪研制成败的关键.在合适的参数下计算出了双光栅单色仪的滤波函数,高低量子数回波信号强度比以及温度随高度的变化,计算出的温度与代入的温度相差约0.3 K,说明此双光栅单色仪的设计是合理的.

Double Grating Monochromator for a Atmospheric Temperature Measurement Pure Rotational Raman-lidar

The double grating monochromator for a pure rotational Raman-lidar can provide suppression of the spectral line better than 10~(-7) for unshifted Rayleigh-Mie scattering, with high-purity rotational Raman spectrum and improved transmission. The optical system has longer stability. The choices of fiber, lens, grating parameters and the position of facula in focal board are critical for a double grating monochromator development. In proper parameters, filter function of a double grating monochromator, the ratio of high- low quantum intensity and temperature were simulated. Simulated temperature is agreed with introduced temperature within 0.3 K.Therefore, the design of the double grating monochromator is reasonable.