Lissajous grid projection and center pixel stability with and without synchronization control

For Lissajous scanning the synchronization of both axis is crucial. The laser beam is deflected vertically by the first MEMS mirror, redirected to the second mirror and deflected horizontally. In the proposed master slave concept, the synchronization controller Φ compensates for relative phase errors by duty cycle adjustments while individual PLLs keep each MEMS mirror stabilized. This videos show how the projected grid and center pixel drifts if the synchroniaztion controller between both MEMS mirrors with individual PLLs is turned off.

对于李萨如扫描（Lissajous scanning）而言，双轴同步至关重要。激光束由首个微机电系统（MEMS）反射镜垂直偏转，被重新导向至第二枚反射镜并完成水平偏转。在本次研究提出的主从架构中，同步控制器Φ通过占空比调整补偿相对相位误差，同时独立锁相环（Phase-Locked Loop, PLL）可维持每一枚MEMS反射镜的稳定运行。本视频展示了当关闭搭载独立锁相环的双MEMS反射镜间的同步控制器后，投影栅格与中心像素的漂移情况。