激光质量测量的自适应衰减控制技术研究

针对激光光束质量测量的激光光强高精度控制问题, 提出一种自适应衰减调节激光光强度的方法。该方法基于单片机控制算法, 利用PC机反馈的光斑图像灰度差值计算得出激光光强需要衰减的倍数, 并通过衰减轮电机控制两组衰减片组合完成对激光光强度的自适应控制, 实现了成像系统闭环控制激光光斑强度, 从而快速、 准确地得到特定光强度的激光光斑图像。实验结果表明, 该方法与以往衰减控制相比,能准确地得到高精度灰度值激光光斑图像, 激光光束质量单次测量时间为5 s, 系统测量时间为3 min。

Research on Adaptive Attenuation Control Technology of Laser Measurement

In laser beam quality measurement, in order to solve the problem of high-precision control of laser intensity, we proposed an adaptive attenuation method for laser light intensity adjustment. The method is based on microcontroller adaptive control algorithm. The laser intensity precision attenuation ratio is calculated using the spot image gray level PC returned. A motor controls two attenuators to adaptively change laser light intensity, achieving a closed-loop system quickly and accurately which obtains the specific light intensity laser spot image. Compared with previous attenuation control methods, the experiment shows that this method can accurately obtain high-precision gray value laser spot image, and the single measurement of the laser beam quality spend only 5 seconds, and system measurement only 3 minutes.