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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 53, Iss. 1 — Jan. 1, 2014
  • pp: 71–75

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

Xiaodong Wen, Tigang Ning, Chao Li, Zexin Kang, Jing Li, Haidong You, Ting Feng, Jingjing Zheng, and Wei Jian  »View Author Affiliations

Applied Optics, Vol. 53, Issue 1, pp. 71-75 (2014)

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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 LP0n 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.

© 2013 Optical Society of America

OCIS Codes
(060.2340) Fiber optics and optical communications : Fiber optics components
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(060.2400) Fiber optics and optical communications : Fiber properties

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: September 4, 2013
Revised Manuscript: November 24, 2013
Manuscript Accepted: November 29, 2013
Published: December 23, 2013

Xiaodong Wen, Tigang Ning, Chao Li, Zexin Kang, Jing Li, Haidong You, Ting Feng, Jingjing Zheng, and Wei Jian, "Liquid level measurement by applying the Mach–Zehnder interferometer based on up-tapers," Appl. Opt. 53, 71-75 (2014)

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