2023 journal article
Extension of Fiber Bragg Grating Ultrasound Sensor Network by Adhesive Couplers
PHOTONICS, 10(12).
author keywords: guided waves; fiber Bragg grating sensors; optical fiber sensors; structural health monitoring
open access via www.mdpi.com (publisher PDF)
Source: Web Of Science
Added: January 8, 2024
Previous studies demonstrated coupling of acoustic guided waves from one optical fiber to another through a simple adhesive bond coupler. This paper experimentally utilizes such an adhesive bond coupler to easily extend an already existing sensor network. We experimentally demonstrate this concept for detecting simulated cracks growing from circular holes in a thin aluminum plate. A single, remotely bonded FBG sensor is used to detect the original crack growth, followed by the addition of other optical fiber segments using adhesive couplers to detect new crack growth locations on the plate. A laser Doppler vibrometer is also used to measure the guided wave propagation through the plate to verify that the changes in the FBG sensor measurements are due to the growth of the cracks.