Design of Acoustic Couplers for Sensing Applications
Abstract
In this proposal, we propose to investigate the direct collection of acoustic signals using the optical fiber simply as an acoustic waveguide and to couple the acoustic information to an already existing sensing optical fiber with through an acoustic coupler. The acoustic information would then be processed through a FGB sensor in the original sensing optical fiber. The coupler does not require cleaving or splicing of the existing optical fiber in order to process the new acoustic information with the FBG sensors. We will design, model and experimentally verify a 2 x 2 acoustic coupler where the amplitude of the two output channels can be independently designed. Theoretical equations will be derived for the coupling efficiency between the optical fibers. Afterwards experimental verification of these theoretical predictions will be performed through both laser Doppler vibrometry measurements of the exterior surface of the coupler and mode amplitude measurements in the optical fibers using FBGs.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Feb 07, 2019
- Source ID
- N000141912053
Entities
People
- Kara Peters
Organizations
- North Carolina State University
- Office of Naval Research
- United States Navy