2024 article
Studying the elastic wave mode propagation in D-shaped optical fibers
HEALTH MONITORING OF STRUCTURAL AND BIOLOGICAL SYSTEMS XVIII, Vol. 12951.
author keywords: guided waves; specialty optical fibers; waveguide; Dshaped
UN Sustainable Development Goal Categories
3. Good Health and Well-being
(Web of Science)
Source: Web Of Science
Added: July 1, 2024
To perform active Structural Health Monitoring (SHM) Guided Waves (GW) have received great interest as they can inspect large areas with a few sensors and are sensitive to barely-visible structural damages. Fiber Bragg Grating (FBG) sensors offer several advantages, but their use has been limited for the GW sensing due to its limited sensitivity. FBG sensors in the edge-filtering configuration have overcome this issue with sensitivity and there is a renewed interest in their use. The sensitivity of the FBG sensors can be further improved through the use of the remote bonding. One of the challenges with the effective and repetitive measurements with the FBG sensors is uncertainty in the bond quality. This is especially important due to the small area of contact of the fiber with the structure. A solution to this is the use of a D-shaped optical fiber which will increase the area in contact. This paper experimentally investigates the coupling of the wave from the structure into the D-shaped fiber. 4 different geometries of optical fiber are studied and the coupling and the propagation amplitudes are investigated using 3D laser Doppler vibrometery measurements.