图像处理在光路自动准直系统中的应用

Performance of image processing in beams automatic alignment system

光路自动准直系统应用于惯性约束聚变的高功率激光装置中的光束自动调整。图像处理是光路自动准直的关键技术之一。针对神光Ⅲ原型装置,结合阈值化、重心法、中值滤波和圆拟合等多种不同的图像处理方法设计了一套合理的准直方案,并且在模拟实验平台上进行了实验验证。实验结果表明,光路自动准直系统能够在15min之内顺利完成光路的自动调整,光束近场调整精度优于近场光斑的±0.5%,光束远场调整精度≤±0.3″,满足了原型装置的总体要求。

The laser beams automatic alignment system is used to adjust beam lines automatically in the high power laser facility for inertial confinement fusion. Image processing is one of the key techniques in laser beam automatic alignment. Considering the SG-III, combining different kinds of methods in image processing such as threshold, gravity model, median filter, and circle fitting, a reasonable scheme for automatic alignment was presented. It was demonstrated on the simulation experiment system. Results indicated that beam paths adjustment can be finished in 15 minutes by the automatic alignment system. The precision of the near field adjustment was less than 0.5% of the spot. The accuracy of the far field adjustment was less than 0.3 double prime . Requirements of the SG-III prototype facility are met.