Abstract:The pure rotational Raman Lidar temperature measurement system usually retrieve atmospheric temperature according to the echo signal of high and low-level quantum numbers of N2 molecules. An effective method to detect the rotational Raman spectrum is taking a grating monochromator. In the present paper the detection principle and the structure of the echelle grating monochromator are described, the high order and lower order quantum number of the probe spectrum is resolved. The focal length of the collimating-focusing optical system is calculated by analyzing echelle grating’s spectroscopic principle and dispersion ability. Subsequently spectral effect is simulated with Zemax software. The simulation result indicates that under the condition of the probe laser wavelength of 532 nm and using echelle grating monochromator, Raman spectrums of 529.05, 530.40, 533.77, 535.13 nm can be separated well, at the same time, the SNR of the system is enhanced by summing the spectral signals of symmetric quantum number. The echelle grating monochromator is small in size, and can easily meet the requirements of the miniaturization of Raman Lidar temperature measurement system.
Key words:Raman spectra;Echelle grating;Lidar;Atmospheric temperature
[1] WANG Ying, REN Guo-yu(王 颖, 任国玉). Climatic and Environmental Research(气候与环境研究), 2005, 10(4): 780. [2] Balin Y S, Bairashin G S, Kokhanenko G P. Quantum Electronics, 2011, 41(10): 945. [3] Fraczek M, Behrendt A, Schmitt N. Applied Optics, 2012, 51(2): 148. [4] Muller D, Kolgotin A, Mattis I. Appl. Optics, 2011, 50(14): 2069. [5] Girolamo P D, Marchese R, Whiteman D N. Geophysical Research Letters, 2004, 31: 1. [6] WANG Shao-lin, SU Jia, ZHAO Pei-tao(汪少林,苏 嘉,赵培涛). Acta Physica Sinica(光学学报), 2008, 28(6): 3941. [7] LI Shi-chun, HUA Deng-xin, SONG Yue-hui(李仕春, 华灯鑫, 宋跃辉). Acta Physica Sinica(光学学报), 2011, 31(6): 1. [8] Chen S Y, Qiu Z J, Zhang Y C. Journal of Quantitative Spectroscopy & Radiative Transfer, 2011, 112: 304. [9] SHI Xiao-ding, ZHANG Yan, HOU Tian-jin(史哓丁, 张 艳, 侯天晋). Laser & Infrared(激光与红外), 2012, 42(5): 499. [10] Kim D, Cha H. Journal of the Korean Physical Society, 2001, 39(5): 838. [11] ZHANG Yin-chao, LIANG Ting , CHEN Si-ying(张寅超, 梁 婷, 陈思颖). Transactions of Beijing Institute of Technology(北京理工大学学报), 2009, 29(5): 451. [12] Nedeljkovic D, Hauchecorne A, Chanin M. IEEE Transactions on Geoscience and Remote Sensing, 1993, 31(1): 90. [13] Arshinov Y F, Bobrovnikov S M, Zuev V E. Applied Optics, 1983, 22(19): 2894. [14] HE Miao, TANG Yu-guo, CHEN Shao-jie, et al(何 淼, 唐玉国, 陈少杰,等). Spectroscopy and Spectral Analysis(光谱学与光谱分析), 2012, 32(3): 849.