超声波探伤时间增益补偿电路设计  

Time gain compensation circuit design of the ultrasonic flaw inspection

作　　者：谢庆炜[1] 梅劲松[1] 马骏[1] 鲁可[1] 

机构地区：[1]南京航空航天大学自动化学院,南京210016

出　　处：《电子测量技术》2012年第11期72-75,共4页Electronic Measurement Technology

基　　金：国家自然科学基金(61104020)

摘　　要：为补偿动车空心车轴超声波探伤信号的传输衰减,设计了由DAC900、AD8331和现场可编程门阵列(FPGA)组成的时间增益补偿电路。简要介绍了时间增益补偿的基本原理,并根据超声波在传播过程中的衰减规律,由FPGA和DAC900输出补偿电压,实现了利用AD8331对回波信号进行补偿放大的功能。实验结果表明,该方案能够有效地对空心轴超声波探伤系统进行放大和增益补偿。与分立元件组成的电路相比,该方案电路设计简单,控制快速稳定,而且,由于FPGA具有可编程性,该电路可对不同的衰减曲线实现灵活的配置。In order to compensate for EMU hollow axle ultrasonic inspection signal transmission attenuation. This paper has proposed a time gain compensation circuit. The circuit is composed of DAC900, AD8331 and field programmable gate array. The paper briefly introduces the basic principle of the time gain compensation. It outputs the compensation control voltage by the FPGA and DACg00 according to the ultrasonic propagation attenuation rule. This compensation control voltage is to control AD8331 to achieve echo signal compensation amplification. Experimental results show that the program can effectively ground to air spindle ultrasonic testing system to zoom in and gain compensation. Compared with the discrete components of the circuit, the scheme has the advantages of simple circuit, fast and stable control. Using the programmable ability of FPGA, the circuit can be varied based on the attenuation curve of flexible configuration.

关 键 词：超声波探伤 时间增益补偿 现场可编程门阵列 AD8331 

分 类 号：TP363[自动化与计算机技术—计算机系统结构]