海水布里渊散射谱特征参数的测量  

Characteristics Measurement of the Ocean Brillouin Scattering Spectrum

作　　者：张念[1] 马泳[1] 梁琨[1] 余寅[1] 王元庆[1] 姚远[2] 

机构地区：[1]华中科技大学电子与信息工程系,武汉430074 [2]华中科技大学公共管理学院,武汉430074

出　　处：《光电工程》2014年第11期84-88,共5页Opto-Electronic Engineering

基　　金：国家自然科学基金项目(61108074);高等学校博士学科点专项科研基金(20100142120012)

摘　　要：为了去除布里渊雷达系统中Fabry-Perot标准具的谱线展宽对谱特征参数测量精度的影响,本文提出了一种双参数拟合结合单参数拟合的方法。该方法首先根据F-P标准具的谱线展宽原理,采用双参数L-M算法进行拟合,分析了拟合参数中拟合向量初始值和最大迭代次数对拟合精度的影响;然后针对其中一个拟合参数结果不稳定的问题,选择附加一个单参数拟合来提高测量精度。实验结果表明,该方法可以使谱特征参数测量精度稳定在MHz量级,保证了0.1℃的温度测量精度。In Brillouin lidar system based on the Rayleigh-Brillouin scattering（RBS） and Fabry-Perot（F-P） etalon, the spectral broadening of F-P etalon could produce measurement error of spectrum characteristics. A fitting procedure based on the combination of the dual-parameter fitting and single-parameter fitting for removing the broadening effect is proposed in this paper. Firstly, based on the analysis of the broadening effect of F-P etalon on the spectrum, a dual-parameter Levenberg-Marquardt（L-M） algorithm fitting is proposed and the effects of the initial values of the fitted parameters and the iteration steps in the fitting are analyzed. Then to deal with one parameter＇s floating, an extra single-parameter fitting procedure is proposed to improve the measurement accuracy. Experiments show that the fitted results can be stable in the magnitude of MHz and the measurement accuracy of temperature can be improved to 0.1 ℃.

关 键 词：海水布里渊散射 激光雷达 法布里-珀罗标准具 布里渊频移 布里渊线宽 

分 类 号：TN249[电子电信—物理电子学] O437.2[机械工程—光学工程]