一种小平台剖面声呐的设计与实现

堤坝内部管涌、裂缝、空洞等安全隐患的检测是长期以来困扰水利部门的技术难题.针对水下堤坝安全检测,提出并设计实现了适合水下机器人等小平台为载体的高分辨率剖面声呐,系统采用大功率宽带水声发射机,产生线性调频脉冲,可以在信号发射后连续获取被测堤坝内部的回波信号,并通过DSP构成的水下信息处理单元进行实时相关信号处理,从而可获得坝体内介质不连续的信息.信号处理后的数据通过光纤传至水上单元,由PC机进行堤坝内部剖面图像的重建及显示.通过水池和外场水库试验,取得了良好的效果,验证了系统技术路线的可行性和性能的稳健性.该系统是为堤坝安全检测而设计,但是在海洋资源勘探和地质沉积层探测等领域同样具有广泛的应用价值.

Design and implementation of chirp sonar for small carrier

On underwater structures,it can be challenging to detect hidden problems such as conduits,cracks,and inanitions.To determine the safety of a dyke, a high-resolution chirp sonar was designed for an underwater robot.The system, which utilizes a high-power,wide-band transmitter,generates a linear frequency modulated pulse,and based on discontinuity,acquires reflection signals from the inside of the dyke.Using a digital signal processor,the data is transmitted to a surface unit through optical fiber.A computer in a surface unit performs a profiling image reconstruction and display.This system achieved favorable results in experiments in a pool and outfield.Although the system was designed for dyke safety detection,it can be widely used in ocean resource surveys,sediment classification,and other applications.