Fiber-based two-wavelength heterodyne laser interferometer
Fiber-based two-wavelength heterodyne laser interferometer
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DOI：
10.1364/oe.466332
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发表时间：
2022-10-10
期刊：
影响因子：
3.8
通讯作者：
Guzman, Felipe
中科院分区：
文献类型：
--
作者：
Zhang, Yanqi;Guzman, Felipe
位移测量干涉术是计量应用中的重要组成部分。在本文中，我们提出了一种基于光纤的双波长外差干涉仪作为一个紧凑的和高灵敏度的位移传感器，可用于惯性传感应用。在所提出的设计中，两个单独的外差干涉仪构造使用两个不同的波长，1064 nm和1055 nm;其中一个测量目标位移和其他监控光纤系统中的共模噪声。一个窄带宽的光谱滤波器将两个干涉仪的光束路径分开，这两个干涉仪是非常常见的，并且对环境噪声提供了高的抑制比。初步测试表明，当在封闭腔室中测试时，1 Hz下的灵敏度下限为7.5 pm/root Hz。我们还研究了由于不完美的光谱分离的位移测量的周期性误差的影响，并提出了算法来减轻这些影响。(c)2022 Optica出版集团根据Optica开放获取出版协议的条款
Displacement measuring interferometry is a crucial component in metrology applications. In this paper, we propose a fiber-based two-wavelength heterodyne interferometer as a compact and highly sensitive displacement sensor that can be used in inertial sensing applications. In the proposed design, two individual heterodyne interferometers are constructed using two different wavelengths, 1064 nm and 1055 nm; one of which measures the target displacement and the other monitors the common-mode noise in the fiber system. A narrow-bandwidth spectral filter separates the beam paths of the two interferometers, which are highly common and provide a high rejection ratio to the environmental noise. The preliminary test shows a sensitivity floor of 7.5pm/root Hz at 1 Hz when tested in an enclosed chamber. We also investigated the effects of periodic errors due to imperfect spectral separation on the displacement measurement and propose algorithms to mitigate these effects. (c) 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement