Investigation of Lamb wave interactions with guided modes in optical fibers
Abstract
The goal of this project is to investigate the unusual behaviors observed in Lamb wave to optical fiber guided mode coupling for structural health monitoring applications. First, these modes will be mapped out in the structure, in the transition zone and in the optical fiber using a 3D microanalyzer laser Doppler vibrometer. In particular, the conditions that launch forward and backward longitudinal modes in the optical fiber will be studied, in order to better understand the conditions that create directional behaviors. Next, additional components will be added into the bond region, for example protective tubing to identify potential interactions between the different components. Finally, interactions between the forward and backward longitudinal modes propagating in a single optical fiber will be forced to create hardware level signal processing for structural health monitoring. Better resolution of these ultrasonic waves could improve the prognostics on structural integrity derived from structural health monitoring systems implemented in advanced naval structures. At the same time, the sensor data and the related interpretation of structural performance could serve as useful data for the future design of high performance vehicles.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jul 26, 2018
- Source ID
- N000141812515
Entities
People
- Kara Peters
Organizations
- North Carolina State University
- Office of Naval Research
- United States Navy