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�������պ����ѧѧ�� 2011, Vol. 37 Issue (3) :253-258    DOI:
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������, �Ʒ�Ӣ, ����ʤ*
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Application of super-heterodyne phase-sensitive detector in electromagnetic acoustic testing
Zhou Zhenggan, Huang Fengying, Ni Xiansheng*
School of Mechanical Engineering and Automation, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

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Abstract�� In order to increase the signal-to-noise ratio of the electromagnetic acoustic received signal,an electromagnetic acoustic inspection system based on super-heterodyne receiver orthogonal phase-sensitive detection technique was designed and applied to inspect samples of aluminum, carbon steel and stainless steels. The received signal after being processed with the orthogonal phase-sensitive detection technology was compared with the received original radio frequency signal. The effects on the testing results of bandwidth settings in the intermediate frequency(IF) amplifier and the low-pass filter of phase-sensitive detector were analyzed. The results show that the application of orthogonal phase-sensitive detection technology in the inspection of aluminum alloy, carbon and stainless steels non-ferromagnetic or ferromagnetic metal materials can denoise from the received signal and increase the signal-to-noise ratio.
Keywords�� electromagnetic acoustic transducer(EMAT)   super-heterodyne receiver   orthogonal phase-sensitive detection     
Received 2010-07-06;
Fund:

������Ȼ��ѧ����������Ŀ(50971006)

About author: ������(1967-),��,������̶��,����,zzhenggan@buaa.edu.cn.
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������, �Ʒ�Ӣ, ����ʤ.�������������첨�ڵ�ų�������е�Ӧ��[J]  �������պ����ѧѧ��, 2011,V37(3): 253-258
Zhou Zhenggan, Huang Fengying, Ni Xiansheng.Application of super-heterodyne phase-sensitive detector in electromagnetic acoustic testing[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2011,V37(3): 253-258
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http://bhxb.buaa.edu.cn//CN/     ��     http://bhxb.buaa.edu.cn//CN/Y2011/V37/I3/253
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