Abstract:

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.

Key words: laser quality measurement, light intensity adjustment, adaptive control, stepper motor