提出一种克服由于冷冻靶制冷系统和真空系统工作时引起的振动所带来的干涉图像抖动的方法。通过两个完全相同的CCD同步捕获冷冻靶干涉图像和空间位置图像,以位置图像来标定冷冻靶的振动情况,从而获得冷冻靶在不同状态下的干涉图像。在标定冷冻靶位置的过程中,提出了频率估计、投影标定、特征匹配和全匹配这4种算法,并给出了对应的数字图像处理算法流程。

In characterizing the fuel layer in ICF cryogenic target by the interferometry,it is inevitable that the target vibrates due to the vibration of the mechanically-cooling and vacuum-pumping system. This leads to different interference patterns of the cryotarget with different states at different times,which is called the interferogram vibration. A method based on the digital-image-processing technology to eliminate this vibration is introduced. By capturing the position and interference images simultaneously by two identical CCDs,the position image is used to determine the vibration degree of targets for processing the interference at a defined state. Four algorithms,frequency estimation,projection demarcation,feature match,and full match are developed to determine the position of the target. The corresponding digital-image-processing methods,instead of upgrading the system hardware,which can largely improve the experimental results from the interference pattern,are introduced.