DFB Fiber Laser for High-resolution Acoustic Emission Detection Based on Beat Frequency Interrogation

Qing Jia,Wenzhu Huang,Wentao Zhang,Huaixiang Ma, Hongli He

Asia Communications and Photonics conference and Exhibition（2018）

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摘要

This paper proposes a compact acoustic emission (AE) detection technique based on distributed feedback fiber laser (DFB-FL) using beat frequency interrogation. Because of the ultra-narrow linewidth of beat frequency and time-frequency analysis method, the detection system can reach a high strain resolution of 6.4×10 -9 with 1 MHz demodulation speed and 400 MHz dynamic range.

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关键词

acoustic emission,distributed feedback fiber laser,beat frequency,time-frequency analysis

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