4.6 Article

High dynamic range distributed acoustic sensing based on dual-wavelength fiber Bragg grating pairs

期刊

OPTICS LETTERS
卷 46, 期 17, 页码 4402-4405

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OPTICAL SOC AMER
DOI: 10.1364/OL.432200

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  1. National Natural Science Foundation of China [61735013, 61905184]

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A high dynamic range distributed acoustic sensing (DAS) system is demonstrated based on a dual-wavelength interferometric acoustic sensor array, achieving significantly enhanced dynamic range through 2λ linear regression phase unwrapping.
A high dynamic range distributed acoustic sensing (DAS) system is demonstrated based on a dual-wavelength (21) interferometric acoustic sensor array, constructed using 21 fiber Bragg grating pairs (FBGPs). Each FBGP is composed of two weak FBGs presenting -30-dB reflectivity and center wavelengths of 1535 nm and 1565 nm. With the phase demodulation results from the two wavelengths, 2 lambda linear regression phase unwrapping is implemented, which significantly enhances the dynamic range of the DAS system. By examining the four time-division-multiplexed sensors, an average background noise level of -105.2 dBrad/root Hzat at 1 kHz and a cross talk level lower than -70 dB at 1 kHz are achieved. (C) 2021 Optical Society of America

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