Research on Weak Signal Detection Method for Electromagnetic Acoustic Transducer
摘 要
电磁超声换能器的换能效率很低,得到的接收信号十分微弱。为了改善接收信号质量,采用了基于谐振理论的选频放大技术、基于互相关理论的锁相放大技术以及平均技术3种方法对电磁超声接收信号进行处理。实验表明,所设计的选频放大电路和锁相放大电路均能将微弱的电磁超声接收信号从强噪声背景中分离,而平均技术则能够有效改善接收信号的信噪比。最后给出了电磁超声系统联调的实验波形,并对3种检测技术的优缺点进行了分析。
Abstract
Received signal of the electromagnetic acoustic transducer (EMAT) is very weak resulted from EMAT's poor transduction efficiency. To improve the signal quality, the EMAT received signals were proceeded with three methods, which were the frequency selecting technique based on resonance theory, the lock-in amplifying technique based on cross-correlation theory and the averaging technique. Experiments proved that both frequency selecting amplifier and lock-in amplifier were able to separate the EMAT received signal from a strong noise background, while the averaging technique could effectively improve the signal to noise ratio of the received signal. At last, waveforms of the received signal were given, and the strengths and weaknesses of these three methods were analyzed.
中图分类号 TG115.28 TP23
所属栏目 试验研究
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收稿日期 2006/8/21
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备注王淑娟(1967-),女,教授,博士生导师,从事电力电子设备可靠性容差设计与故障诊断理论及应用的研究。
引用该论文: WANG Shu-juan,KANG Lei,ZHAI Guo-fu. Research on Weak Signal Detection Method for Electromagnetic Acoustic Transducer[J]. Nondestructive Testing, 2007, 29(10): 591~595
王淑娟,康 磊,翟国富. 电磁超声换能器的微弱信号检测[J]. 无损检测, 2007, 29(10): 591~595
被引情况:
【1】米武军,康 磊,王淑娟,冯剑钊,翟国富, "基于FPGA的轮对踏面电磁超声在线检测系统",无损检测 32, 519-523(2010)
【2】李鹏展,王亚坤,汪开灿,康磊,王淑娟, "基于电磁超声的列车轮对踏面在线探伤装置",无损检测 35, 70-74(2013)
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参考文献
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【2】Murayama R, Fujusawa K, Fukuoka H, et al. Nondestructive evaluation of material properties with EMAT (formability in cold rolled steel sheets and residual stress in railroad wheel)[C]. IEEE Ultrasonics Symposium,1989:1159-1162.
【3】曾庆勇.微弱信号检测[M].杭州:浙江大学出版社,1986:35.
【4】MacLauchlan D, Clark S, Cox B, el al. Recent advancements in the application of EMATs to NDE[C]. 16th World Conference on NDT, Montreal, Canada;2004.
【5】Legendre S, Massicotte D, Goyette J, et al. Wavelet-transform-based method of analysis for lamb-wave ultrasonic NDE signals[J]. IEEE Trans on Instrumentation and Measurement,2000,49(3):524-530.
【6】Tittmann B, Alers R, Lerch R. Ultrasonics for locomotive wheel integrity[C]. IEEE Ultrasonics Symposium,2000:743-746.
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