Using the optical chopper to modulate the detected light to make it related to the reference squarewave signal is a common method of locking phase detection of weak signals.
其中利用光学斩光器对被测光进行调制使其与方波参考信号相关是对微弱光信号进行锁相检测的一种常用方法。
This paper introduced some common faults of 721 spectrophotometer, found out the cause of formation, and presented fixing method, it may be used for instrument maintenance for reference.
介绍了721型分光光度计，灯电源电路和稳压电路故障现象，分析了故障产生的原因，提供了排除故障办法，对该仪器维修提供了借鉴的经验。
The common method to compensate the coupling loss is to make various reference blocks according to the material of workpieces, obviously it consumes time and labor.
目前常用的补偿藕合损耗的方法是根据材质制作对比试块，但该方法费时费力。
The common method to compensate the coupling loss is to make various reference blocks according to the material of workpieces, obviously it consumes time and labor.
目前常用的补偿藕合损耗的方法是根据材质制作对比试块，但该方法费时费力。
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