Relative Humidity Sensors Using Hydrogel-Coated Long Period Fiber Grating

Wang, Liwei; Tu, Dongsheng; Mao, Xianhui; Zhang, Min; Liao, Yanbiao

doi:10.1364/ofs.2006.tue38

Cited by 2 publications

(1 citation statement)

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“…Then, how to accurately demodulate the sounds explored by the fiber-optic hydrophone is crucial. Phase-generated-carrier (PGC) technique and 3×3 coupler-based technique are two traditional demodulation methods, of which PGC technique is preferred due to its advantages of large dynamic range and good linearity [5][6][7][8]. It plays an important role in anti-submarine warfare, marine seismic detection, subsea oil exploration, and underwater navigation.…”

Section: Introductionmentioning

confidence: 99%

A High-Frequency Sound based PGC Demodulation Scheme for Fiber Optics Hydrophone

Shi

Yin

Zhu

et al. 2021

Preprint

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In the research field of fiber-optic hydrophone, the performance of demodulation scheme is crucial. In this work, a phase-generated-carrier (PGC) demodulation scheme based on high-frequency sound source is proposed. Highfrequency acoustic signal from the external sound source is applied to the fiber-optic hydrophone to achieve phase modulation of the interference signal instead of the piezo-electrical transducer (PZT) or frequency-modulated laser. It possesses the merits of low system complexity and low cost. Through the acoustic detection experiment, we achieve demodulation of acoustic signal at frequency varying from 300 Hz to 800 Hz, and the signal-to-noise ratio (SNR) is higher than 45 dB. Furthermore, the proposed scheme is successfully applied to time division multiplexing (TDM) experiment.

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Section: Introductionmentioning

confidence: 99%