These devices are most effectively used in nulling and beam centering applications where the goal is to maintain or monitor optical alignment by keeping a balanced or null signal.
这种器件最有效地使用于调零和光束置中应用，目标通过保持平衡或调零信号来维护或监测光学器件的对准。
The papaer describes an automatic optical alignment system for laser-fusion facility. Technical problems concerning the beam centering sensor, laser and the computer etc are discussed.
介绍了用于激光核聚变装置光路自动准直系统，讨论了光束位置探测器，激光器，微机等技术问题。
Besides, centering and tack welding by laser beam should be avoided as centering point and tack-welding point can influence weld quality largely.
但焊缝质量受激光对中点和点焊点的影响很大，应尽量避免采用激光对中及点焊。
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