基于扩展收敛域指数CORDIC算法的超声时间增益补偿技术  

Ultrasonic time gain compensation technology based on extended convergence index CORDIC algorithm

作　　者：邓鹰飞[1] 刘桂雄[2] DENG Yingfei;LIU Guixiong(School of Mechanical and Material Engineering,Wuzhou University,Wuzhou 543002,China;School of Mechanical and Automotive Engineering,South China University of Technology,Guangzhou 510640,China)

机构地区：[1]梧州学院机械与材料工程学院,广西梧州543002 [2]华南理工大学机械与汽车工程学院,广东广州510640

出　　处：《中国测试》2018年第7期116-120,共5页China Measurement & Test

基　　金：国家重大科学仪器设备开发专项(2013YQ230575);2018年度广西高校中青年教师基础能力提升项目(2018KY0536)

摘　　要：针对经典超声时间增益补偿增益范围有限问题,该文提出一种基于扩展收敛域指数CORDIC算法的超声时间增益补偿技术。首先,通过指数CORDIC算法计算信号原始放大倍数;然后,利用乘法器组将A/D采样后的超声回波数字信号与放大倍数相乘;最后,经D/A转换器输出补偿后的模拟信号。实验表明:扩展收敛域指数CORDIC算法计算超声回波增益最高相对误差不高于0.014%,该算法的超声时间增益补偿模块能准确检出检测块内不同深度处缺陷,准确度高、实时性好、增益范围大,具有很好的实际应用效果和重要研究价值。Aiming at the problem of the limited gain range of classical ultrasonic time gain compensation,an ultrasonic time gain compensation technique based on extended convergence index CORDIC algorithm is proposed.First,the original signal magnification is calculated through index CORDIC algorithm.Then the ultrasonic echo digital signal after A/D sampling is sent to the multiplier group to multiply with the magnification.Finally,the compensated analog signal is exported after the D/A conversion.Experimental results demonstrate that the highest relative error of ultrasonic echo gain based on extended convergence index CORDIC algorithm is less than 0.014%.The defects in the test block were detected accurately,which has the characteristics of high accuracy,good real-time performance and large gain range,and it has good practical application effect and important research value.

关 键 词：时间增益补偿 CORDIC算法 FPGA 超声实验平台 

分 类 号：TH878[机械工程—仪器科学与技术]