Etched optical fiber vibration sensor to monitor health condition of beam like structures

Abstract

Using a center etched single mode optical fiber, a simple vibration senor is designed to monitor the vibrations of a simply supported beam. The sensor has high linear response to the axial displacement of about 0.8 mm with a sensitivity of 32 mV/10 µm strain. The sensor is tested for periodic and suddenly released forces, and the results are found to coincide with the theoretical values. This simple design, small in size and low cost sensor may find applications in industry and civil engineering to monitor the vibrations of the beam structures and bridges.

FBG based high sensitive pressure sensor and its low-cost interrogation system with enhanced resolution

“…In contrast, fiber Bragg grating (FBG)-based fiber optic sensors have significant advantages over conventional sensors such as the small size, lightweight, large dynamic range, immunity to EMI, high sensitivity and accuracy, ease to embed in civil structures, chemical inertness, and remote sensing capability. Moreover, the multiplexing property of FBG sensors makes them potential candidates for spatially distributed measurements [6][7][8][9][10][11]. However, the pressure sensitivity of a bare FBG (-0.022 pm/psi) is very low, which is to be greatly enhanced [12].…”

Ultra-High Sensitive Strain Sensor Based on Post-Processed Optical Fiber Bragg Grating

“…Chemically etched tapers do not suffer modification of the fiber core, whereas the cladding is partially or totally removed. Besides the biconical tapers [10,11], fiber tip sensors have been proposed. These sensors present high-sensitivity to the environment [12] and are very well suited to perform biosensing [13].…”