Share Email Print

Proceedings Paper

A flexible fiber displacement sensor with tunable resolution and dynamic range based on a few-mode fiber loop
Author(s): Xin Fu; Ping Lu; Deming Liu; Jiangshan Zhang; Shibin Jiang
Format Member Price Non-Member Price
PDF $17.00 $21.00

Paper Abstract

In this article, we propose a fiber displacement sensor based on a few mode fiber loop sandwiched between two single mode fibers (SMF). The proposed sensor is flexible due to the tunable resolution and dynamic range. The FMF is coiled to a fiber loop by making a knot. The in-line MZI sensing structure is fixed on a two dimensional (2D) translation stages. By moving one stage while another stage is fixed, the displacement is applied on the sensing structure. The resolution of the translation stage is 10μm. The few mode fiber loop acts as the transducer for the displacement sensing. The displacement will change the radius of the few mode fiber loop, which leads to a wavelength shift of the interference pattern. When the fiber loop has different initial radius, the same displacement will cause a different curvature variation. So the sensitivity of the wavelength shift to the displacement is dependent on the initial radius. A smaller initial radius of the loop will lead to a larger sensitivity, higher resolution but smaller dynamic range, so it is proper for micro displacement sensing. On the contrary is the lager initial radius that is proper for sensing in a large dynamic range. By simply adjusting the initial radius of the transducer loop, different sensitivity and resolution can be reached. Experimental results show the sensitivities of 0.267nm/mm, 0.384nm/mm, 0.749nm/mm and 1.06nm/mm for initial loop radius of 1.9cm, 1.5cm, 1cm and 0.75cm, respectively.

Paper Details

Date Published: 20 February 2017
PDF: 3 pages
Proc. SPIE 10110, Photonic Instrumentation Engineering IV, 101101K (20 February 2017); doi: 10.1117/12.2251853
Show Author Affiliations
Xin Fu, Huazhong Univ. of Science and Technology (China)
Ping Lu, Huazhong Univ. of Science and Technology (China)
Deming Liu, Huazhong Univ. of Science and Technology (China)
Jiangshan Zhang, Huazhong Univ. of Science and Technology (China)
Shibin Jiang, AdValue Photonics, Inc. (United States)

Published in SPIE Proceedings Vol. 10110:
Photonic Instrumentation Engineering IV
Yakov G. Soskind; Craig Olson, Editor(s)

© SPIE. Terms of Use
Back to Top
Sign in to read the full article
Create a free SPIE account to get access to
premium articles and original research
Forgot your username?