激光相干法测量次表层海水温度的理论与实验研究

项目名称： 激光相干法测量次表层海水温度的理论与实验研究

项目编号： No.41306092

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 天文学、地球科学

项目作者： 任秀云

作者单位： 哈尔滨工业大学

项目金额： 25万元

中文摘要： 针对目前次表层海水温度测量技术中存在的问题，结合瑞利散射大气温度遥感技术的发展现状，提出了采用激光随机相干新方法，通过测量激光在海水中的瑞利散射光谱对海水温度进行遥感测量的研究课题。利用宽带高速光电探测器接收稳频的本振激光与随机瑞利散射光相干产生的差频信号，进行傅里叶变换分析可以快速获取瑞利散射光谱，反演海水温度。研究内容涉及海水瑞利散射的准弹性散射特性及其模型描述，连续本振激光与脉冲瑞利散射光随机相干过程的理论分析与计算机模拟，差频信号的傅里叶变换分析，海水温度反演算法和误差分析、校正算法以及瑞利散射海水温度检测模型的修正等理论和实验研究。本课题研究目的是准确描述海水瑞利散射特性，建立海水瑞利散射展宽谱模型，阐明其用于海水温度遥测的内在机理，探索一条采用激光随机相干方法测量瑞利散射光谱从而测量次表层海水温度的新途径，为实现次表层海水温度快速大面积测量的理论创新和实验探索贡献一份力量。

中文关键词： 海水温度；瑞利散射；相干；布理渊散射；拉曼散射

英文摘要： In view of the problems of current sub-surface seawater temperature telemetry, combined with the sensing technology development status of atmospheric temperature based on Rayleigh scattering, A random laser coherent method is proposed to measure the laser Rayleigh scattering spectra in seawater so as to remote sense seawater temperature. A broadband high-speed photodetector is used to receive the random beating signal produced by the frequency stabilized local oscillator light and the random Rayleigh scattering light, and Fourier transform analysis is used to get the Rayleigh Scattering spectra, and then obtain the seawater temperature. The theoretical and experimental study involve the quasi-elastic scattering properties of Rayleigh scattering of seawater and its model description, the theory analysis and computer simulation of the random coherent process of local oscillator light and random Rayleigh scattering light, the Fourier transform analysis of the beating signal, the inversion algorithm and error analysis of seawater temperature, as well as and the modification of the Rayleigh scattering temperature sensing model. Purposes of this study are accurate descripting the Rayleigh scattering properties of seawater, establishing the Rayleigh scattering broadening spectra model, clarifying the intrinsic mecha

英文关键词： seawater temperature；Rayleigh scattering；coherent；Brillouin scattering；Raman scattering