Dynamic strain measured by Mach-Zehnder interferometric optical fiber sensors.
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.
Department of Mechanical Engineering, Yuan Ze University, Chung-Li 320, Taiwan. mesch@saturn.yzu.edu.tw
Shiuh-Chuan
SC
Her
Chih-Min
CM
Yang