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Dual polarization fiber grating laser hydrophone
Bai-Ou Guan1, Yan-Nan Tan, Hwa-Yaw Tam
1Institute of Photonics Technology, Jinan University, Guangzhou 510632, China. guanboo@yahoo.com
Optics Express
|December 10, 2009
Summary
A new fiber optic hydrophone uses a special laser and diaphragm to detect sound. This design offers simple interrogation, absolute frequency encoding, and sensor multiplexing for underwater acoustic monitoring.
Area of Science:
- Photonics and Sensor Technology
- Underwater Acoustics
- Fiber Optic Sensing
Background:
- Traditional hydrophones face limitations in interrogation and multiplexing capabilities.
- Fiber optic sensing offers potential for robust and sensitive acoustic detection.
Purpose of the Study:
- To propose and demonstrate a novel fiber optic hydrophone.
- To leverage dual polarization fiber grating lasers for acoustic pressure sensing.
- To explore advantages in interrogation, encoding, and multiplexing.
Main Methods:
- Integration of a dual polarization fiber grating laser with an elastic diaphragm.
- Conversion of acoustic pressure to transversal force on the laser cavity.
- Modulation of fiber birefringence and beat frequency in response to acoustic signals.
Main Results:
- Experimental demonstration of the proposed fiber optic hydrophone.
- Acoustic pressure successfully transformed into measurable beat frequency shifts.
- Validation of ease of interrogation and absolute frequency encoding.
Conclusions:
- The novel fiber optic hydrophone design is experimentally validated.
- The device offers significant advantages for underwater acoustic sensing applications.
- Frequency division multiplexing enables multi-sensor integration on a single fiber.
