... 主机找中不好 the alignment of m/e is incorrect 转子找中假轴 centering beam 半主轴 semi-major axis ...
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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。
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。
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。
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