超声检测中常用激励波形的高精度相控发射实现  

High precision phased transmission of commonly used excitation waveforms in ultrasonic testing

作　　者：蔡明飞[1] 师芳芳[1] 孔超[1] 张碧星[1] 

机构地区：[1]中国科学院声学研究所声场声信息国家重点实验室,北京100190

出　　处：《应用声学》2015年第6期526-532,共7页Journal of Applied Acoustics

基　　金：国家自然科学基金项目(11174321;11374324)

摘　　要：超声无损检测根据不同的检测需求使用不同的激励波形,而超声相控阵技术的应用则要求各通道的激励波形能够相控发射。本文分析了不同检测对象、不同检测方法对激励信号的波形类型要求,研究了基于FPGA主控的数字式超声检测平台下实现单通道方波脉冲、尖脉冲、正弦波形和任意波形等的发射方法,以及以上各种波形在多通道高精度相控发射时的实现方法。实验表明,各种波形的激励信号都实现了高精度相控发射,最高可达1 ns的延时精度。Excitation waveforms vary according to the testing requirements in ultrasonic nondestructive test- ing, and ultrasonic phased array technology demands the phased transmission of excitation waveforms among channels. Analyzed the wave type requirements of diverse testing specimens and methods, and studied the implementation of square-wave pulse, sharp pulse, sinusoidal wave and arbitrary wave of single channel in digital ultrasonic testing platform based on FPGA, as well as the method of high precision phased transmis- sion of multiple channels of the waveforms above. Experiments show that all the excitation waveforms can be transmitted at the time resolution of 1 ns, respectively.

关 键 词：超声检测 激励波形 波形类型 相控发射 

分 类 号：TB517[理学—物理]