High-speed multiplexed fiber laser acoustic emission sensing system using 3×3 coupler and FPGA parallel processing algorithm

Wentao Zhang; Wenzhu Huang; Gaoran Guo; Fang Li

doi:10.1117/12.2541728

16 October 2019 High-speed multiplexed fiber laser acoustic emission sensing system using 3×3 coupler and FPGA parallel processing algorithm

Wentao Zhang, Wenzhu Huang, Gaoran Guo, Fang Li

Author Affiliations +

Proceedings Volume 11205, Seventh International Conference on Optical and Photonic Engineering (icOPEN 2019); 1120510 (2019) https://doi.org/10.1117/12.2541728
Event: Seventh International Conference on Optical and Photonic Engineering (icOPEN 2019), 2019, Phuket, Thailand

Abstract

This paper proposes a wavelength-division multiplexing fiber laser acoustic emission sensing technique based on 3×3 coupler type interrogation method and a FPGA parallel processing algorithm. Narrow-linewidth (about 3 kHz) singlefrequency distributed feedback fiber lasers are used for acoustic emission probes. A NI FlexRIO device is used to acquire the original signals from the photodetectors. A symmetric demodulation algorithm is executed in the FPGA using parallel data processing structure. The acoustic emission sensing system with four parallel channels and 2 MHz sampling rate achieves a wavelength resolution of 2 × 10^-7 pm/√Hz @ 100 kHz.

Citation Download Citation

Wentao Zhang, Wenzhu Huang, Gaoran Guo, and Fang Li "High-speed multiplexed fiber laser acoustic emission sensing system using 3×3 coupler and FPGA parallel processing algorithm", Proc. SPIE 11205, Seventh International Conference on Optical and Photonic Engineering (icOPEN 2019), 1120510 (16 October 2019); https://doi.org/10.1117/12.2541728

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