The node is used as sampling flag and the beat-wave fringe fraction is measured with double frequency interferometer combined by optical components.

该装置以拍波合成的场强信号的节点为对准标志，以光路组合形成的双频激光干涉仪测量尾数部分。

youdao

In this paper, we describe the basic principle of polarization maintaining optical fiber and the method to measure the beat length of PM optical fiber.

本文叙述了保偏光纤能够保证传输光波偏振特性的基本原理，介绍了测量保偏光纤拍长的基本方法。

youdao

And tests on the laser's optical performance like wavelength, the facular quality and mode, the fluorescence signal, the beat frequency signal are carried out;

对激光器电学部分如自制电压源、电流源、温控模块等研制方案及电路框图进行了介绍，给出了测试数据和数据分析结果；

youdao