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(接本刊第8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。只要材料声速准确,算出的声束位置也会准确。2)变量:计算的准确性相关于几个变量,包括:被检材料声速,探头组件尺寸(阵元尺寸,主频率,楔内延迟声程),以及影响相位干涉图形的脉冲发生器的
(Access issue No. 8) 5 phased array parameters and data display computer control evaluation 5.1 Overview 1) Principle: Phased array ultrasonic beam control is based on the principle of Fermat, that is to follow the shortest path of sound propagation. 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 velocity is accurate, the calculated beam position will be accurate. 2) Variables: The accuracy of the calculation is related to several variables including the speed of sound of the material to be inspected, the dimensions of the probe assembly (element size, dominant frequency, delay wedge in the wedge) and the pulse generator affecting the phase interference pattern