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Dynamic Strain Measured by Mach-Zehnder Interferometric Optical Fiber Sensors

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Author(s): Shiuh-Chuan Her | Chih-Min Yang

Journal: Sensors
ISSN 1424-8220

Volume: 12;
Issue: 3;
Start page: 3314;
Date: 2012;
Original page

Keywords: optical fiber sensor | Mach-Zehnder interferometer | dynamic strain | 3 × 3 coupler

ABSTRACT
Optical fibers possess many advantages such as small size, light weight and immunity to electro-magnetic interference that meet the sensing requirements to a large extent. In this investigation, a Mach-Zehnder interferometric optical fiber sensor is used to measure the dynamic strain of a vibrating cantilever beam. A 3 × 3 coupler is employed to demodulate the phase shift of the Mach-Zehnder interferometer. The dynamic strain of a cantilever beam subjected to base excitation is determined by the optical fiber sensor. The experimental results are validated with the strain gauge.
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