Research on vibration signal processing system based on FPGA

Keqing Ning; Aoyang Xie; Na Xing; Minghua Du

doi:10.1117/12.3033628

13 June 2024 Research on vibration signal processing system based on FPGA

Keqing Ning, Aoyang Xie, Na Xing, Minghua Du

Proceedings Volume 13180, International Conference on Image, Signal Processing, and Pattern Recognition (ISPP 2024); 131802K (2024) https://doi.org/10.1117/12.3033628
Event: International Conference on Image, Signal Processing, and Pattern Recognition (ISPP 2024), 2024, Guangzhou, China

Abstract

To overcome the limitations of software demodulation in laser vibration measurement, a hardware demodulation scheme based on a field-programmable gate array (FPGA) is designed. The reference signal is synthesized using direct digital frequency synthesis and mixed with the Doppler signal. An orthogonal baseband signal is then generated through Butterworth low-pass filtering. Subsequently, a nonlinear error compensation algorithm is introduced to rectify errors. The CORDIC algorithm is applied for inverse tangent demodulation of the laser signal, while a phase detuning algorithm addresses signal hopping issues. Following data processing, the fast Fourier algorithm is used for time-frequency analysis of the vibration data signal. The proposed algorithm undergoes theoretical analysis and experimental verification, ensuring real-time vibration detection and meeting high precision requirements. This offers a more concise and efficient solution for laser vibration measurement systems.

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

Citation Download Citation

Keqing Ning, Aoyang Xie, Na Xing, and Minghua Du "Research on vibration signal processing system based on FPGA", Proc. SPIE 13180, International Conference on Image, Signal Processing, and Pattern Recognition (ISPP 2024), 131802K (13 June 2024); https://doi.org/10.1117/12.3033628

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KEYWORDS

Field programmable gate arrays

Demodulation

Signal processing

Doppler effect

Error control coding

Vibrometry

Laser frequency

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