(接上期)5相控阵参数和数据显示的计算机控制评价5.1概述(1)原理:相控阵的超声声束控制是基于费尔马原理,即声传播遵循时间最短的行程。此原理可用于相控阵探头阵元发射的超声波前传播声程的声线跟踪,以计算出使声束对准特定位置时定时电子设备所需要的延迟时间。利用费尔马原理,输入材料声速,就可算出折射角和焦点位置。只要材料声 (Continued) 5 Computer-controlled evaluation of phased array parameters and data display 5.1 Overview (1) Principle: Ultrasonic beam steering of phased arrays is based on Fermat’s principle that acoustic propagation follows the shortest path. This principle can be used for sound ray tracing of the projectile projectile transmitted by the phased array probe array element to calculate the delay time required to time the electronic equipment when the sound beam is aimed at a particular position. Using Fermat’s principle, enter the material velocity of sound, can calculate the angle of refraction and focal position. As long as the material sound