For the leak detecting system of water pipeline based on virtual instruments, its acoustic emission measurement and correlation are adopted for detecting orientation.
基于虚拟仪器的水管道泄漏检测定位系统，其检漏与定位分别采用声发射检测法和互相关分析法。
2
A standing wave tube measurementsystem is presented for measuring low frequency acoustic properties of underwater acoustic materials.
介绍一种用于水声材料低频声性能测量的驻波管测试系统。
3
For underwater acoustic positioning system based on measurement of time_delay, range ambiguity appears when pulse's propagating time is longer than its repetition period.