Optimization of Structural Lamb Wave Coupling to Fiber Bragg Grating Sensors
Abstract
Funds are provided to Professor Kara Peters from North Carolina State University, in the amount of $50K as the first increment of a"" 3 year grant totaling $ 300,000.00 for ~Optimization of Structural Lamb Wave Coupling to Fiber Bragg Grating Sensors~. Some of the" activities to be performed under this grant include: 1- Investigate the role of viscosity on the measured signal amplitude and distortion in a FBG coupled to a structure with a viscous agent. 2. Quantify signal distortion as a function of frequency through an adhesive bond to FBG sensor and how this maps to signal distortion in narrow bandwidth (Lamb waves) and broad bandwidth excitations (acoustic emission). 3. Investigate how multiple bond locations affect the forward and backward coupling of modes between the optical fiber and the structure and whether this coupling can be exploited to multiplex signals.4. Quantify the strength and fatigue life of high sensitivity fiber Bragg gratings from a novel fabrication processes.Abstract:Quantifying the role of different bond paramet"ers on the sensitivity of FBG sensors to surface ultrasonic and acoustic emission waves and optimizing their performance as sensors,"" requires an integrated experimental, characterization and computational effort.This research project will investigate the role of"" viscosity on the measured signal amplitude and distortion in a FBG coupled to a structure with a viscous agent. Further,the signal" distortion as a function of frequency through an adhesive bond to FBG sensor and how this maps to signal distortion in narrow bandwidth (Lamb waves) and broad bandwidth excitations (acoustic emission) will be quantified. We will focus on FBG sensor measurement of two different excitation signals: Lamb waves due to a narrowband PZT actuator and acoustic emission signals. The primary difference" between these twocases is the bandwidth of frequencies in the signals, changing the level of dispersion and therefore its relative"" influence on the output signal. Finally, the strength and fatigue life of high sensitivity fiber Bragg gratings from a novel fabric"ation process will be experimentally measured.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Sep 01, 2017
- Source ID
- N000141712764
Entities
People
- Kara Peters
Organizations
- North Carolina State University
- Office of Naval Research
- United States Navy