Implementation and characterization of liquid-level sensor based on a long-period fiber grating Mach-Zehnder interferometer


An optical liquid-level sensor (LLS) based on a long-period fiber grating (LPG) interferometer is proposed and experimentally demonstrated. Two identical 3-dB LPGs are fabricated to form an in-fiber Mach-Zehnder interferometer, and the fiber portion between two LPGs is exposed to the liquid as the sensing element. The sensitivity and measurement range of the sensors employing different orders of cladding modes are investigated both theoretically and experimentally. The experimental results show good linearity and large measurement range. One of the significant advantages of such a sensing structure is that the measurement level is not limited to the length of the LPG itself. Also, the measurement range and sensitivity of the proposed LLS can be readily tailored for a particular applications.

Divisions: College of Engineering & Physical Sciences > School of Computer Science and Digital Technologies > Electronics & Computer Engineering
Aston University (General)
Additional Information: Copyright 2011 Elsevier B.V., All rights reserved.
Publication ISSN: 1530-437X
Last Modified: 23 Oct 2019 12:30
Date Deposited: 03 Dec 2012 10:03
Published Date: 2011-11
Authors: Fu, Hongyan
Shu, Xuewen
Zhang, Aping
Liu, Weisheng
Zhang, Lin
He, Sailing
Bennion, Ian


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