Analysis of laser’s monochromatic and stable frequency indexes based on edge detecting technology
-
摘要: 基于边缘探测技术的激光雷达实际应用中,激光器在工作中发射光信号的中心频率会发生漂移,激光频率的漂移过大,会直接影响边缘探测系统的测量精度。采用仿真计算的方法得到碘分子吸收滤波器在470nm~550nm范围内的吸收光谱谱线,以基于边缘探测技术的激光雷达监测大气信道和海洋水下信道环境参数为例,得到适合大气和海洋探测吸收谱线并确定发射激光信号的中心频率。通过理论分析,给出了满足探测要求的激光发射信号单稳频指标,为实际探测系统的设计奠定基础。Abstract: In the application of the lidar system based on edge detecting technology,the laser's central frequency will drift.If the excursion of the central frequency is too big,it will influence the measuring precision of edge detecting system.Through simulation and calculation,the absorption spectrum of molecule iodine absorption filter from 470nm~550nm was obtained.Taking the atmospheric parameters and the underwater parameters as an example,based on the lidar system using edge detecting technology,the absorption spectrum of molecule iodine absorption filter,meeting the requirement of the detecting system' was obtained and the center emission frequency of laser emitter was determined.Based on the above results,the proper monochromatic and stable frequency,meeting the detecting system's demand,was determined and the results can be used as the guideline of laser emitter's choice in the practical systems.
-
-
[1] HICKMAN C D,KATTAWAR G W,FRY E S.Aircraft laser sensing of sound velocity in water:Brillouin scattering[J].Remote Sensing of Environment,1991,36(1):165～178.
[2] EMERY Y E,FRY E S.Laboratory development of a lidar for measurement of sound velocity in the ocean using Brillouin scattering[J].SPIE,1997,2963:210～215.
[3] LIU D H,KATZ J W.Edge technique for the measurements of Brillouin scattering in water[J].Chinese Journal of Lasers,1999,26(4):307～311(in Chinese).
[4] LIU Zh Sh,SONG X Q,LIU J T.Speed measuring system of non-coherent pulse Doppler lidar[J].Chinese Science Bulletin,2001,46(24):2080～2085(in Chinese).
[5] LI J,BAI X D,SHEN N Ch.The parameters optimization of Doppler-broadened iodine at 532nm Nd:YVO4 laser frequency stabilization[J].Laser Technology,2003,27(1):50～52(in Chinese).
[6] FLESIA C,LKORB C.Theory of the double edge molecula technique for Doppler lidar wind measurement[J].Appl Opt,1999,38(3):432～440.
[7] FORKEY J N,LEMPERT W R,MILES R B.Corrected and calibrated I2 absorption model at frequency-doubled Nd:YAG laser wavelengths[J].Appl Opt,1997,36(27):6729～6738.
[8] BREWER L,TELLINGHUISEN J.Quantum yield for unimolecular dissociation of I2 in visible absorption[J].Chem Phys,1972,56(8):3929～3928.
[9] WANG L L,REN G,ZHANG Y.Study of Brillouin scattering in atmosphere[J].Laser Technology,2003,27(4):365～367(in Chinese).
[10] HUANG Zh H,REN G,CAI B W.Calculation of detecting spatial object based on Brillouin scattering[J].Laser Technology,2004,27(4):518～520(in Chinese).
计量
- 文章访问数: 2
- HTML全文浏览量: 0
- PDF下载量: 10
下载: