【作者】 吴国清； 贾宁； 陈庚；

【Author】 WU Guoqing,JIA Ning,CHEN Geng (Institute of Acoustics,Chinese Academy of Sciences,Beijing 100080,China)

【机构】 中国科学院声学研究所；

【摘要】 用激光照射水面,接收从水面反射或散射回来的激光信号,根据多普勒测速的原理,获得水面运动速度随时间变化函数,从中提取到水下声信号。本文提出一种测量激光系统引入的干扰噪声强度的实用方法。保持发射换能器到水面激光照射点和到水听器的距离相同,换能器发射单频脉冲信号,分别用水听器系统和激光系统检测,两者接收到的单频信号强度相同,从而测量到干扰噪声的相对强度。消声水池实验结果显示激光检测的背景噪声高于水听器检测方法30dB。更多还原

【Abstract】 A measurement method of the interference noise intensity caused by laser system in the underwater acoustic detection is proposed in this paper.The distance of the sound source to the hydrophone is equal to the distance of the sound source to the water surface point lighted by the laser.The sound source emissions a pulse signal of the single frequency. Having equal intensity of the single frequency for the two received signals by Laser way and hydrophone way,therefore the intensity of the interference noise caused by Laser is obtained.A experiment shows that the intensity of the interference noise from Laser is 30dB higher than the noise by hydrophone way.更多还原