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Minghua Du

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Proceedings Article | 13 June 2024 Paper

Research on vibration signal processing system based on FPGA

Keqing Ning, Aoyang Xie, Na Xing, Minghua Du

Proceedings Volume 13180, 131802K (2024) https://doi.org/10.1117/12.3033628

KEYWORDS: Field programmable gate arrays, Demodulation, Signal processing, Doppler effect, Vibrometry, Error control coding, Laser frequency, Phase modulation, Nonlinear optics

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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.

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