| Citation: | PENG Meng-fan, ZHOU Ci-ming, PAN Zhen, JIANG Han, LI Ao, WANG Tian-yi, LIU Han-jie, FAN Dian. A noise suppression method for interferometric fiber optic sensor based on ameliorated EFA and adaptive SVMD[J]. Chinese Optics. doi: 10.37188/CO.EN-2025-0038
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Noise interference critically impairs the stability and data accuracy of sensing systems. However, current suppression strategies fail to concurrently mitigate intrinsic system noise and extrinsic environmental noise. This study introduces a composite denoising approach to address this challenge. This method is based on the ameliorated ellipse fitting algorithm (AEFA) and adaptive successive variational mode decomposition (ASVMD). System noise is closely correlated with the direct-current and alternating-current components in the interferometric signal. AEFA effectively suppresses this noise by removing these components. The ASVMD technique adaptively extracts environmental noise components predominantly present in the phase signal. To achieve optimal decomposition results automatically, the permutation entropy criterion is employed to refine decomposition parameters. The correlation coefficient is utilized to differentiate effective components from noise components in the decomposition results. Experimental results indicate that the combined AEFA and ASVMD algorithm effectively suppresses both system and environmental noise. When applied to 50 Hz vibration signal processing, the proposed approach achieves a noise reduction of 17.81 dB and a phase resolution of 35.14 μrad/√Hz. Given the excellent performance of the noise suppression, the proposed approach holds great application potential in high-performance interferometric sensing systems.
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