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Demonstration of Coherent Interference between Acoustic Waves Using a Fiber Ring Resonator
Jee Myung Kim1, Junghyun Wee1, Kara Peters1
1Department of Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, NC 27695, USA.
Sensors (Basel, Switzerland)
|June 10, 2022
Summary
This study shows acoustic waves maintain coherence when transferred between different optical fibers using an adhesive coupler. Fiber ring resonators (FRR) enable coherent acoustic wave interference for sensing applications.
Area of Science:
- Photonics and Wave Phenomena
- Materials Science and Engineering
- Acoustic Sensing Technologies
Background:
- Optical fibers can detect acoustic modes converted from Lamb waves for structural health monitoring.
- Acoustic modes transfer between fibers via adhesive couplers, preserving waveform integrity.
- Previous methods typically rely on fiber Bragg grating sensors for acoustic mode detection.
Purpose of the Study:
- To experimentally investigate the coherence of acoustic waves transferred through an adhesive coupler.
- To utilize a fiber ring resonator (FRR) configuration to study acoustic wave interference.
- To demonstrate the sensing capabilities of the FRR system using acoustic wave properties.
Main Methods:
- Employed a fiber ring resonator (FRR) configuration to analyze acoustic wave interference.
- Tested acoustic wave transfer and coherence using diverse optical fiber geometries (single-mode, hollow capillary, multi-mode).
- Investigated acoustic wave coherence through an adhesive bond coupler between fibers.
Main Results:
- Acoustic waves exhibit coherent interference even when transferred between dissimilar optical fiber types.
- The FRR configuration successfully demonstrated coherent interference of acoustic waves.
- The system showed potential for sensing applications, including water-level and temperature measurements.
Conclusions:
- Adhesive couplers maintain acoustic wave coherence during transfer between different optical fibers.
- Fiber ring resonators are effective for studying and utilizing coherent acoustic wave phenomena.
- The FRR system offers a viable platform for developing novel optical fiber-based sensors.
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