Research on hardware acceleration of multi-longitudinal mode laser beat frequency demodulation system

Kun Liu; Xiaoling Tong; Lei Liang; Shangming Du; Tainwei Chen

doi:10.1117/12.3039100

13 September 2024 Research on hardware acceleration of multi-longitudinal mode laser beat frequency demodulation system

Kun Liu, Xiaoling Tong, Lei Liang, Shangming Du, Tainwei Chen

Proceedings Volume 13254, Fourth International Conference on Optics and Image Processing (ICOIP 2024); 1325403 (2024) https://doi.org/10.1117/12.3039100
Event: Fourth International Conference on Optics and Image Processing (ICOIP 2024), 2024, Chongqing, China

Abstract

Real-time monitoring of downhole temperature and pressure variations plays a crucial role in ensuring well safety and effective reservoir management in oil and gas exploration. Leveraging the fiber Bragg grating technology with multilongitudinal mode laser frequency modulation and incorporating side-hole optical fiber grating sensors enable highresolution monitoring of well temperature and pressure. Utilizing digital demodulation technology to decipher multilongitudinal mode frequency modulation signals addresses challenges associated with traditional spectrum analyzers, such as structural complexity and poor stability. However, current research lacks dedicated demodulation methods for multi-longitudinal mode laser frequency modulation signals, apart from general software processing approaches. This paper introduces a hardware acceleration approach for frequency modulation demodulation. It outlines a hardware acceleration architecture based on a Field-Programmable Gate Array (FPGA). This architecture implements hardware circuits for various demodulation processes, including all-phase fast Fourier transform and phase difference method spectrum correction. It adopts a pipeline architecture and multi-clock domain processing to enhance signal processing efficiency. The system ultimately achieves a demodulation frequency of 15.259 kHz, a demodulation delay of 0.143ms, and a data utilization rate of 100%.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Kun Liu, Xiaoling Tong, Lei Liang, Shangming Du, and Tainwei Chen "Research on hardware acceleration of multi-longitudinal mode laser beat frequency demodulation system", Proc. SPIE 13254, Fourth International Conference on Optics and Image Processing (ICOIP 2024), 1325403 (13 September 2024); https://doi.org/10.1117/12.3039100

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KEYWORDS

Demodulation

Laser frequency

Data processing

Signal processing

Clocks

Digital signal processing

Field programmable gate arrays

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