基于NI的疲劳裂纹扩展试验摄像头运动控制系统

针对疲劳裂纹在线检测的问题，提出了基于NI运动控制技术的疲劳裂纹扩展试验摄像头运动控制方法。该系统主要包括CCD摄像机、镜头、云台、NI-PCI-7334运动控制卡、光源照明系统、NI-PCI-1410图像采集卡、计算机以及安装在计算机内的图像处理软件和上位机运动控制软件。根据摄像头在图像采集过程中的动作要求，设计了运动控制方案，采用NIMotion软件包开发了四轴运动控制程序。实验结果显示，该系统可以实现疲劳试验中摄像头单步／连续运动及试验过程中的裂纹自动跟踪，摄像头定位精度达到0．05mm。

Camera movement control system in fatigue crack propagation test based on NI technology

Aiming at the problem of on-line fatigue crack detection, a camera motion control method applied to the fatigue crack propagation test based on NI technology was supplied. The system includes CCD cameras, lenses, PTZ, motion control card PCI-7334, a lighting device, image acquisition card PCI-1410, computer with the image processing software and PC movement control software. In accordance with the camera movement requirements during image acquisition, the motion control structure was designed, four-axles movement control application software was developed with NI Motion tool. The experiment results show that the single step/continue movement and automatic tracking of the cameras are nerformed during the fatiuue test and the camera position control accuracy reaches O. 05 ram.