Design and calibration of the Fabry-Perot etalon in Rayleigh backscattering Doppler wind lidar
-
摘要: 为了精确观测平流层风场，采用F-P标准具作为瑞利散射测风激光雷达多普勒频率检测的核心器件，对F-P标准具多普勒频率检测原理进行了理论分析，从分析最大设计高度时的测量误差着手，优化选取标准具透过率曲线参量；介绍了透过率曲线参量的校准过程和校准方法，分析了导致透过率曲线的半峰全宽增大的原因、透过率曲线校准精度对速度灵敏度及系统探测误差的影响；并通过实验对设计和校准结果进行了验证。结果表明，由于透过率曲线的半峰全宽增大，导致速度灵敏度下降了0.118%/（m·s-1）；40km高度处，在测量信噪比大于10的条件下，径向速度测量精度增大2m/s。
-
关键词:
- 激光技术 /
- 激光雷达 /
- Fabry-Perot标准具 /
- 瑞利散射 /
- 多普勒频率
Abstract: The Fabry-Perot etalon was the key component of a Rayleigh Doppler wind lidar. In order to accurately determine the Doppler shift proportional to the wind velocity, the principle of Rayleigh Doppler frequency measurement was deeply analyzed, and the optimum parameters of the etalon were determined after analyzing the detection error at the maximum height designed. The calibration method and idea were introduced in detail. The factors making the full width at half maximum(FWHM) of the transmission curves broadened were analyzed, the calibration accuracy of the transmission curve affecting the velocity sensitivity and the system measuring error was also analyzed in detail. The design and calibration were verified in experiments. The result indicated that the velocity sensitivity of etalon decreased 0.118%/(m·s-1) due to the broadened FWHM of transmission curves and with the signal-to-noise ratio no less than 10, the accuracy of the line-of-sight velocity increased 2m/s at 40km altitude height.-
Keywords:
- laser technique /
- lidar /
- Fabry-Perot etalon /
- Rayleigh backscattering /
- Doppler frequency
-
-
[1] XU W J, SUN D S, SHU Z F, et al. Wind velocity inversion algo- rithm for triple-channel Rayleigh Doppler wind lidars[J]. Laser Technology, 2011, 35(4): 481-485 (in Chinese).
[2] LI C, SHU Zh F, XU W J, et al. Development of molecule wind lidar receiver based on Fabry-Perot[J]. Laser Technology, 2011, 35(2): 156-159 (in Chinese).
[3] KORB C L, GENTRY B M, LI S X, et al. Theory of the double-edge technique for Doppler lidar wind measurement[J]. Applied Optics, 1998, 37(15): 3097-3104.
[4] FLESIA C, KORB C L. Theory of the double-edge molecular technique for Doppler lidar wind measurement[J]. Applied Optics, 1999, 38(3): 432-440.
[5] KORB C L, GENTRY B M, WENG C Y. The edge technique: theory and application to the lidar measurement of atmospheric winds[J]. Applied Optics, 1992, 31(21): 4202-4213.
[6] KORB C L, GENTRY B M, LI S X. Edge technique Doppler lidar wind measurements with high vertical resolution[J]. Applied Optics, 1997, 36(24): 5976-5983.
[7] GENTRY B M, CHEN H. Tropospheric wind measurements obtained with the goddard lidar observatory for winds (GLOW): validation and performance[J]. Proceedings of IEEE, 2001, 4484:74-81.
[8] GENTRY B M, CHEN H L. Profiling tropospheric winds with the goddard lidar observatory for winds (GLOW) [C]//Proceedings of the 21st International Laser Radar Conference.Washington,D C,USA:NASA,2002:4p.
[9] GENTRY B M, CHEN H L, LI S X. Wind measurements with 355nm molecular Doppler lidar[J]. Optics Letters, 2000, 25(17): 1231-1233.
[10] FLESIA C, KORB C L, CHRISTINA H. Double-edge molecular measurement of lidar wind profiles at 355nm[J]. Optics Letters, 2000, 25(19): 1466-1468.
[11] SHEN F H, CHA H, SUN D S, et al. Low tropospheric wind measurement with Mie Doppler Lidar[J]. Optical Review, 2008, 15(4): 204-209.
[12] TANG L,WANG Y T, SHU Zh F, et al. Analysis of detectors and transmission curves correction of mobile rayleigh Doppler lidar[J]. Chinese Physics Letters, 2010, 27(11):114207.
计量
- 文章访问数: 9
- HTML全文浏览量: 0
- PDF下载量: 6
下载: