纯转动拉曼测温激光雷达滤光器参数设计

Filter parameters design of pure rotational Raman lidar for temperature measurement

以获得最高的温度测量精度为目的,设计了纯转动拉曼激光雷达的滤光器参数,包括两个接收通道滤光器的中心波长和半高全宽。进一步研究表明:当被探测大气的温度降低时,或当噪声增强时,二号通道中心波长的设计应向发射波长靠近。另外,反演过程中拟合式引入的误差非常小,可忽略不计。必须避免混入的弹性信号增大到一定程度后,而引起测量温度的漂移。

For the purpose of the highest measuring temperature precision, we have desigried filter parameters of the pure rotational Raman lidar, which comprises central wavelength and full width half maximum （FWHM） of two receiving channels. Further research indicates that, when the detected atmosphere temperature decrea- ses or the noise level increases, the designed central wavelength of channel 2 should be set closer to the emission wavelength. In addition, the error produced by simulation formula during retrieving is quite small and could be ignored. At last,＂ the elastic signal should be suppressed to a certain extent, which would induce excursion of retrieved temperature.