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Research on a pulse interference Filter Used for the Fiber Bragg Grating Interrogation System

Photonic Sensors 2018年第3期8卷 270-277页

作者： Weifang ZHANG Feifei REN Yingwu LI Bo JIN Wei DAI School of Reliability and Systems Engineering Beihang University Beijing 100191 China School of Energy and Power Engineering Beihang University Beijing 100191 China

In this paper, a novel pulse interference filter for fiber Bragg grating （FBG） interrogation based on the tunable Fabry-Perot （F-P） filtering principle is proposed and experimentally demonstrated. The self-developed FBG interrogation system is devised for the aircraft health management of key structures. Nevertheless, the pulse interference is detected in the reflection spectrum of FBG causing interrogation system unstable. To address the problem, the first-order lag pulse broadening filter is proposed in this paper. The first-order lag filter is applied to preprocess and smooth the original signal, meanwhile enhancing the signal-to-noise ratio （SNR）. Afterwards, peaks of reflection spectrum are distinguished with pulse interference by pulse broadening. Experimental results indicate that 634 peaks are detected before adopting the first-order lag pulse broadening filter. Comparatively, the number of peaks decreases to 203 after filtering the interference pulse, and the correct rate of peak detection is higher than 98.5%. Through the comparison with the finite impulse response （FIR） filter, the advantage of first-order lag filter is proved. The vibration monitoring experiment demonstrates that this system has high dynamic precision with a dynamic interrogation range of 0Hz-400Hz, and the maximum repetition rate of 800Hz.

关键词： Fiber Bragg grating tunable F-P filtering principle pulse interference digital filtering

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Suppression of pulse interference in Partial Discharge Measurement Based on Phase Correlation and Waveform Characteristics

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Journal of Energy and Power Engineering 2015年第3期9卷 289-295页

作者： Shengyou Gao Qi Wang Junfeng Gui Yunfeng Xia Jianhua Lin Jianhua Huang Xiyang Chen Electrical Engineering Department Tsinghua University Beijing 100084 China

Partial discharge measurement is one of the most effective methods to find insulation defects and early failure of high voltage power equipments. The accuracy is significantly reduced by the interference in the partial discharge on-site detection or on-line monitoring, especially by the pulse interference. This paper studies the phase correlation of some types of typical partial discharge pulses and their characteristics in time domain and frequency domain. By collecting enough partial discharge pulse data, the correlation coefficient can be calculated based on both phase correlation and waveform similarity. The type of pulse will be determined by the scope of the calculated correlation coefficient. The pulses with very strong correlation will be identified as periodic pulse interference. The pulses with very weak correlation will be identified as random pulse interference. Only the pulses whose correlation coefficients fall into a specific range will be identified as partial discharge signals. In laboratory, simulated pulse interference is injected into measurement circuit, and typical partial discharge pulses are sampled by a high-speed acquisition system. The pulse interference can be effectively separated from partial discharge signals by correlation coefficient.

关键词： Correlation coefficient partial discharge phase correlation pulse interference waveform characteristic.

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