The ray approach is adopted to study the acoustic field in theory, and the ultrasonic experiment has been carried out in laboratory to model the underwater waveguide.
理论上采用射线近似方法分析了时间反转声场特性，实验上在实验室内开展了水下波导的超声模拟实验。
2
Ray-tracing method, which is one of the typical method in room-acoustic computer simulation, is discussed.
对房间声学计算机模拟方法中的经典方法之——声线跟踪法进行了分析。
3
The application condition of inner quality testing of carbon material by ultrasonic, X ray and acoustic emission was introduced.