该文分析外差激光雷达测量水体布里渊散射的可行性。借助测量水体布里渊散射的频移 ,可得到水体声速或温度。文中利用两条 12 7I2 吸收线锁定激光输出频率 ,产生稳定的频差约为7.5 GHz发射激光和激光本振。通过对 12 7I2 吸收线稳定度、激光频率稳定度、系统信噪比和反演精度的分析和计算机模拟 ,得出水体深度 2 5 m以内水体布里渊散射频移的测量误差可以控制在2 .5 MHz以内 ,达到水中声速 0 .6 m/ s或温度 0 .1℃的测量精度。 This paper analyzes the feasibility of heterodyne Lidar to measure Brillouin scattering in water. By measuring the frequency shift of the Brillouin scattering of the water body, the sound velocity or the temperature of the water body can be obtained. In this paper, two 12 7I2 absorption lines are used to lock the laser output frequency, resulting in a stable laser emission with a frequency difference of about 7.5 GHz and a laser local oscillator. Through the analysis of 1212 absorption line stability, laser frequency stability, signal to noise ratio and inversion accuracy and computer simulation, it is concluded that the measurement error of Brillouin scattering frequency shift within 25 m depth of water can be controlled at 2 Within 5 MHz, the measurement accuracy of 0. 6 m / s or 0,1 ° C in water is achieved.