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Compact, low-cost, and highly sensitive optical fiber hydrophone based on incident angle sensing
Applied Optics
|November 2, 2019
Summary
A novel optical fiber hydrophone uses an incident-angle sensing mechanism for high sensitivity and simplified fabrication. This compact, low-cost device offers a low detection limit and wide bandwidth for underwater acoustic detection.
Area of Science:
- Photonics
- Acoustics
- Sensor Technology
Background:
- Traditional hydrophones often require complex fabrication and precise optical control.
- Developing sensitive, cost-effective hydrophones with wide bandwidth remains a challenge.
Purpose of the Study:
- To demonstrate a compact, low-cost, and highly sensitive optical fiber hydrophone (OFH).
- To utilize an incident-angle sensing mechanism (IA-OFH) for simplified device design and operation.
Main Methods:
- Employed an off-center positioned collimator for light emission and reception, leveraging its sensitivity to incident angles.
- Utilized angle-sensitive detection, eliminating the need for precise control over light wavelength and cavity length.
- Fabricated a quartz-based IA-OFH.
Main Results:
- Achieved a low detection limit of 0.7 mPa/Hz1/2.
- Demonstrated a wide dynamic range of approximately 110 dB.
- Exhibited a response bandwidth exceeding 1.0 MHz.
Conclusions:
- The developed IA-OFH offers a simplified and cost-effective solution for underwater acoustic sensing.
- The incident-angle sensing mechanism significantly reduces fabrication complexity and interrogation system requirements.
- The device shows excellent performance metrics, making it suitable for various hydroacoustic applications.
