论文标题
基于纤维的两波长杂作干涉仪
Fiber-based two-wavelength heterodyne laser interferometer
论文作者
论文摘要
位移测量干涉法是计量应用中的关键组成部分。在本文中，我们提出了一个基于纤维的两波长杂项干涉仪作为紧凑且高度敏感的位移传感器，可用于惯性感应应用。在拟议的设计中，使用两个不同的波长，1064 nm和1055 nm构建了两个单独的杂作干涉仪；其中一种测量目标位移，另一个测量纤维系统中的共同模式噪声。狭窄的带宽光谱滤波器将两个干涉仪的梁路径分开，这是高度常见的，并为环境噪声提供了高排斥比。初步测试显示在封闭的腔室中测试时，在1Hz处的灵敏度底部为7.5pm/rthz。我们还研究了由于光谱分离不完善对位移测量的周期性错误的影响，并提出了算法来减轻这些效果。
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/rtHz at 1Hz 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.
