Abstract
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.
© 2018 The Author(s)
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