| 涂层厚度与粘接质量的电磁声谐振无损检测 |
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| 引用本文： | 何龙龙, 张闯, 李泽欢, 刘素贞, 杨庆新. 涂层厚度与粘接质量的电磁声谐振无损检测[J]. 声学学报, 2021, 46(2): 292-300. DOI: 10.15949/j.cnki.0371-0025.2021.02.014 |
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| 作者姓名： | 何龙龙 张闯 李泽欢 刘素贞 杨庆新 |
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| 作者单位： | 河北工业大学省部共建电工装备可靠性与智能化国家重点实验室 天津300130;河北工业大学河北省电磁场与电器可靠性重点实验室 天津300130;河北工业大学省部共建电工装备可靠性与智能化国家重点实验室 天津300130 |
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| 基金项目： | 国家自然科学基金项目(51777052,51977058);河北省自然科学基金项目(E2017202055);河北省高校重点项目(ZD2018214);省部共建电工装备可靠性与智能化国家重点实验室自主研究课题项目(ERIZZ2018002)资助。 |
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| 摘 要： | 为了解决电磁超声(EMAT)涂层质量检测中接收信号信噪比较低的问题,将电磁声谐振技术(EMAR)应用于涂层质量检测,有效提高了超声接收信号的信噪比。在EMAR仿真中,通过变步长离散仿真得出了谐振与非谐振状态下的时域波形和频谱图,验证了利用电磁声谐振进行涂层质量检测的可行性。以电磁超声谐振驻波作为检测信号,实验中谐振信号的幅值为未谐振反射回波的2.52倍,信噪比由26 dB(反射回波)提高到34 dB(谐振信号)。利用EMAR信号的谐振频率差进行涂层厚度检测,对0.2~0.8 mm的试件的检测误差在5%以内且涂层厚度越大,谐振频率越多,谐振频率差越小,检测精度越高;通过功率谱密度函数(PSD)表征不同粘接程度的试件,不同试件的PSD比值为61.17:4.15:1,区分度相对于峰峰值比值提升明显。
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| 关 键 词： | 电磁超声 声谐振 超声无损检测 功率谱密度 |
| 收稿时间： | 2019-08-09 |
| 修稿时间： | 2020-06-19 |
Coating quality nondestructive detection of metal materials using electromagnetic ultrasound |
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| HE Longlong, ZHANG Chuang, LI Zehuan, LIU Suzhen, YANG Qingxin. Coating quality nondestructive detection of metal materials using electromagnetic ultrasound[J]. ACTA ACUSTICA, 2021, 46(2): 292-300. DOI: 10.15949/j.cnki.0371-0025.2021.02.014 |
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| Authors: | HE Longlong ZHANG Chuang LI Zehuan LIU Suzhen YANG Qingxin |
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| Affiliation: | 1. State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, Tianjin 300130;2. Key Laborutory of Electromagnetic Field and Electrical Apparatus Reliability of Hebei Province, Heberi University of Technology, Tianjin 300130 |
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| Abstract: | To solve the problem of low signal-to-noise ratio of received signals in the coating quality detection using ElectroMagnetic Acoustic Transducer(EMAT),ElectroMagnetic Acoustic Resonance(EMAR) technology is applied to improve the signal-to-noise ratio of received signals.The discrete resonance spectra and the time domain waveforms of resonance and non-resonance are obtained by simulation and the feasibility of coating quality detection by electromagnetic acoustic resonance is verified.The electromagnetic ultrasonic signal resonates in the coating and the resonant standing wave is collected as the detection signal.The amplitude of the resonant signal is about 2.5 times that of the reflected echo,and the signal-to-noise ratio is increased from 26 dB(reflected echo) to 34 dB(resonant signal).The coating thickness is detected by the resonant frequency difference of electromagnetic acoustic resonance signal.The detection error of specimens of 0.2-0.8 mm is within 5%.The larger the coating thickness is,the more resonant frequency is,the smaller the resonant frequency difference is,and the higher the detection accuracy is.The Power Spectral Density(PSD)is used to distinguish specimens with different adhesion degrees.The PSD ratio of different specimens was 61.17:4.15:1,which was significantly improved compared with the peak-to-peak ratio of 2.45:1.78:1.Experimental results show that the electromagnetic acoustic resonance technology can effectively improve the signal-to-noise ratio of electromagnetic ultrasonic echo signal and improve the precision of electromagnetic ultrasonic coating quality testing. |
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| Keywords: | EMAT EMAR Nondestructive testing PSD |
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