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海水水下温度的快速大范围测量是海洋监测的重要内容,在民用和军事领域都有着至关重要的意义,本文提出了采用相干瑞利散射方法测量海水水下温度的新方法:用宽带高速光电探测器接收本振激光和海水后向瑞利散射光相干产生的差频信号,进行傅里叶变换分析获取海水瑞利散射展宽谱,从而反演海水温度,首先从海水的热力学特性出发,对利用瑞利散射谱测量海水水下温度的基本原理进行了理论研究和软件模拟;然后对采用相干探测测量海水瑞利散射谱的测量方法进行了理论分析和软件模拟;在此基础上对瑞利散射海水水下温度测量精度进行了分析,得出当水体瑞利散射频谱半宽度测量精度为1 MHz时,测温精度约为0.35 K。
The rapid and large-scale measurement of seawater temperature is an important part of marine monitoring. It is of vital importance both in civil and military fields. In this paper, a new method of measuring underwater seawater temperature using coherent Rayleigh scattering is proposed. After the photodetector receives the laser beam and the seawater, the difference frequency signal generated by coherent Rayleigh scattering light is obtained, and the Fourier transform analysis is performed to acquire the sealer Rayleigh scattering broadening spectrum so that the seawater temperature can be inverted. Based on the thermodynamic characteristics of the seawater, The basic principle of using Rayleigh scattering spectrum to measure underwater temperature in seawater is theoretically studied and the software simulation is carried out. Then, the measurement method of seawater Rayleigh scattering spectrum by coherent detection is analyzed theoretically and software simulation. Based on this, The accuracy of the seawater temperature measurement is analyzed. It is concluded that the temperature measurement accuracy is about 0.35 K when the half-width of Rayleigh scattering spectrum is 1 MHz.