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26 May 2011 AUV-portable temperature-compensating fiber optic hydrophone
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Passive acoustic monitoring hydrophones with low power consumption for autonomous underwater vehicles (AUVs) are desirable for long term unmanned monitoring of ocean acoustics including marine mammal acoustics as well as those due to human activity. Fiber-optic hydrophones offer wider bandwidth and high sensitivity alternatives to conventional piezoelectric transducer (PZT) devices. Deployment on board AUVs requires operation under a wide range of temperature and pressure conditions that change with depth and location, hence, maintaining the sensitivity and reliability over the operating range is crucial. A read-out mechanism for a resonant hydrophone using a fiber Bragg grating (FBG) transducer is described. The read-out uses a temperature tuned DFB laser diode to compensate for FBG changes with temperature and depth, enabling operation over a wide temperature range. Its compact footprint and battery-powered readout system operation enables portability on AUVs.
© (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Indu Fiesler Saxena, Narciso Guzman, Kaleonui J. Hui, and Stephen Pflanze "AUV-portable temperature-compensating fiber optic hydrophone", Proc. SPIE 8026, Photonic Applications for Aerospace, Transportation, and Harsh Environment II, 802608 (26 May 2011);


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