Strain Transfer Function of Distributed Optical Fiber Sensors and Back-Calculation of the Base Strain Field

The Effects of Adhesive and Bonding Length on the Strain Transfer of Optical Fiber Sensors

Abstract: Optical fiber sensors have been extensively adapted as structural health monitoring devices. Due to the existence of the adhesive layer, a portion of the strain is absorbed by the adhesive. As a result, the structural strain sensed by the optical fiber is underestimated and required to be corrected. An analytical solution is presented through which it is possible to establish the rela...

Effect of Coating on the Strain Transfer of Optical Fiber Sensors

Optical fiber strain sensors with light weight, small dimensions and immunity to electromagnetic interference are widely used in structural health monitoring devices. As a sensor, it is expected that the strains between the optical fiber and host structure are the same. However, due to the shear deformation of the protective coating, the optical fiber strain is different from that of host struc...

Mechanical Property and Strain Transferring Mechanism in Optical Fiber Sensors

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 in...

Thermal Strain Analysis of Optic Fiber Sensors

An optical fiber sensor surface bonded onto a host structure and subjected to a temperature change is analytically studied in this work. The analysis is developed in order to assess the thermal behavior of an optical fiber sensor designed for measuring the strain in the host structure. For a surface bonded optical fiber sensor, the measuring sensitivity is strongly dependent on the bonding char...