阵列式超声无损检测中的多通道光弹成像研究

Study on Multi-Channel Photoelastic Imaging in Array Type Ultrasonic Nondestructive Testing

为了使相控阵和阵列式探伤中声路可见,研究人员能更直观地观察声场,利用超声波本质的应力波属性,及偏振光干涉原理,研制了多通道动态光弹成像系统.通过控制各通道超声波的发射延迟时间,在光学试件中激发各种聚焦声场,模拟相控阵聚焦声场的声束扫查过程,通过CCD拍摄固体中声波的传播图像,在时序电路下形成动态视频图像并对拍摄的图像进行采集存储.

In order to make the ultrasonic propagation path become visible in ultrasonic phased array and Ultrasonic array testing technology,researchers can observe the acoustic field directly,using the properties of the ultrasonic as a stress wave,according to the theory of polarized light interference,a multi-channel dynamic photoelastic imaging system is developed successfully.The system can generate many kinds of focusing ultrasonic fields in optical specimen by controlling the ultrasonic transmission delay time of each equipment channel,and the system has the ability to simulate the acoustic field＇s focusing process of the ultrasonic phased array.The image was shot by CCD camera reflects the propagation process of the acoustic field in the specimen,and the dynamic video is formed under control of the timing circuit,and the system has the ability to save the captured image in the computer.