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

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...

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Bibliographic Details
Published in:Applied optics (2004) 2014-01, Vol.53 (1), p.71-75
Main Authors: Wen, Xiaodong, Ning, Tigang, Li, Chao, Kang, Zexin, Li, Jing, You, Haidong, Feng, Ting, Zheng, Jingjing, Jian, Wei
Format: Article
Language:English
Subjects:
Fibers
Liquid levels
Liquids
Mach-Zehnder interferometers
Mathematical analysis
Measuring instruments
Sensors
Wavelengths
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Summary: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.
ISSN:1559-128X
2155-3165
DOI:10.1364/AO.53.000071