一种新的采用基准离焦信号的针孔调焦方案，用于激光直写的自动对焦子系统。
A new pinhole-focusing scheme using referenced defocus signal is applied to an automatic subsystem for laser direct writing.
记录和分析了高功率激光焊接中工作区的紫外和红外信号，着重分析了双波段信号与离焦量变化的对应规律。
Dual waveband signals in high power laser welding were recorded and analyzed, especially, the law between the signals magnitude and the defocusing was discussed.
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