基于图像处理的超声探头声场测量

Acoustic Field Measurement of Ultrasonic Probe Based on Image Processing

在超声无损探测中,探头的性能好坏直接制约着整个检测系统的性能。论文以超声探头的声场特性为研究对象:首先建立探头的声场特性参数体系,然后采用球靶法进行C扫描成像,接着对声场图像进行预处理及二值化、边缘检测及特征提取,获得探头的近场长度、孔径大小和声束半扩散角等性能参数,根据实际检测的声场参数来指导超声无损检测。最后通过实验来验证了该方法的有效性。

The characteristics of ultrasonic probe restrict the performance of the non-destructive inspection system.The characteristics of acoustic field is focused in this paper.Firstly,the characteristic parameter system of acoustic field is constructed.Secondly,acoustic field is visualized through scanning spherical target.Thirdly,near field length,aperture size and off-axis angle of acoustic field are worked out after image process such as preprocessing,binaryzation,boundary detection and characteristic extraction.Then,how to apply the measured characteristics of probe acoustic field in non-destructive inspection is discussed.Finally,some measurement experiments indicate the validity of the proposed method.