超声检测技术广泛应用于工业产品质量控制和在役设备检测中，对于保障人民生命和国家财产安全具有重要意义。提高超声检测仪器的自动化程度、检测效率和可靠性对于提高超声检测技术的水平具有影响。 本课题以虚拟仪器结构为体系平台，以系统集成思想为指导，以传统超声探伤仪为基础，借助机电一体化技术、信号处理技术、图像处理和分析技术等，开发了对各类工程构件的缺陷检测和识别具有普遍指导意义的超声水浸扫描成像系统。该系统具有二维超声图像显示、数据处理和存储、图像坐标定位、缺陷图像处理、检测报告自动生成和打印等功能，实现了超声检测的数字化、图像化和自动化。 在LabWindows/CVI虚拟仪器软件平台上，借助计算机I/O接口和串口通信技术完成了对超声数据采集卡和三坐标探头自动扫描机构的驱动和控制；利用ActiveX技术，解决了LabWindows/CVI和MATLAB、Office Word软件的接口，使得检测系统集成了多个软件的功能优势，实现了对超声扫描图像的处理和检测报告的生成和打印；构建了超声水浸检测平台，通过研究自动扫描成像的关键技术及其软件实现方法，成功实现了以伪彩色和灰度模式显示超声A扫描、B扫描和C扫描图像；通过对采样信号位置坐标的转换实现了缺陷的自动定位；通过对缺陷扫描图像进行滤波去噪、基于阈值分割的二值化处理、边缘的精确检测等技术的研究，以便针对不同检测对象缺陷的不同性质和特点进行缺陷特征提取，并为缺陷的定性、定量评价奠定了基础。

Ultrasonic testing technique, which has been widely used to control the quality of product in industry and to test the equipment on service, has an important meaning to safeguard the life of people and the safety of national property. It has an effect in improving the ultrasonic testing condition to enhance automatization, efficiency and reliability of ultrasonic testing instrument. Taking the virtual instrument structure as the architecture platform, the idea of system integration as guidance, the traditional ultrasonic flaw detector as base, the ultrasonic immersion scanning imaging system, which provides the general guidelines to the defect detection and recognition of various engineering components, has been developed with aid of electromechanical integration technology, signal processing technology, image processing and analyzing technology, etc. The numeralization, imaging and automatization of ultrasonic testing has been realized in the system with the function of displaying 2-dimensional ultrasonic images, processing and saving data, positioning image coordinates, processing defect image, generating and printing testing reports automatically and so on. On the virtual Instrument software platform, LabWindows/CVI, the drive and control to ultrasonic data acquisition card and 3-coordinate transducer automatic scanning mechanism has been done with the help of computer I/O interface and serial communication. Making use of ActiveX technology, the software interface between LabWindows/CVI and MATALB, Office Word has been carried out, which makes sure the testing system integrates the advantages of several softwares and realizes the processing of ultrasonic scanning image and the generating and printing of testing report. The ultrasonic immersion testing platform has been constructed. By researching on the key technology of automatic imaging by scanning and its application, the display of ultrasonic A-scan, B-scan and C-scan in the form of gray image and pseudo-color image has been achieved successfully. The automatic positioning of defect has been realized by transforming position coordinate of sample signal. The technologies of filtering and denoising scanning defect image, binarization processing based on threshold methods of image segmentation and detecting accurate edge have been researched, which is convenient for the defect feature extraction according to the different defect properties and characters of testing objects, and lays a foundation for the qualitative and quantitative evaluation.