基于上锥形结构应用马赫-曾德尔干涉仪进行液位测量。

Liquid level measurement by applying the Mach-Zehnder interferometer based on up-tapers.

作者信息

Wen Xiaodong, Ning Tigang, Li Chao, Kang Zexin, Li Jing, You Haidong, Feng Ting, Zheng Jingjing, Jian Wei

出版信息

Appl Opt. 2014 Jan 1;53(1):71-5. doi: 10.1364/AO.53.000071.

DOI:10.1364/AO.53.000071

Abstract

A novel scheme for liquid level detection using an all-fiber Mach-Zehnder interferometer, based on two up-tapers, is proposed and experimentally investigated. The effective refractive indices of the axisymmetric modes LP(0n) are analyzed while it is partly immersed in liquid. The sensitivity of the sensor is greatly dependent on the fiber length between the two up-tapers, as well as the order of the cladding modes through the calculation. The experimental results show that the sensitivity of the Mach-Zehnder interferometer reaches a 22.5 nm wavelength shift per meter of level change with the middle fiber length of 14.3 cm. The proposal might be attractive since the up-tapered liquid level sensor could easily be fabricated and used for a large measuring range.

摘要

提出了一种基于两个上锥形结构的全光纤马赫-曾德尔干涉仪液位检测新方案，并进行了实验研究。分析了轴对称模式LP(0n)部分浸入液体时的有效折射率。通过计算可知，传感器的灵敏度很大程度上取决于两个上锥形结构之间的光纤长度以及包层模式的阶数。实验结果表明，当中间光纤长度为14.3 cm时，马赫-曾德尔干涉仪的灵敏度达到每液位变化1米波长偏移22.5 nm。该方案可能具有吸引力，因为这种上锥形液位传感器易于制造且可用于较大的测量范围。