dual frequency optical source
Dual frequency optical source 双频光源 DFS Distributed fiber sensor 分布式光纤传感器 ..
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文本用纵向塞曼双频稳频激光器作光源，提出了一种光学超外差法小平面角的精密测量方法。
This paper discussed an opto-heterodyne technique for small-plane-angle measurement with a frequency-stabilized longitudinal Zeeman laser as the light source.
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