6 March 2015 An excitation signal source with anti-interference ability for eddy current testing
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Proceedings Volume 9446, Ninth International Symposium on Precision Engineering Measurement and Instrumentation; 944616 (2015) https://doi.org/10.1117/12.2180731
Event: International Symposium on Precision Engineering Measurement and Instrumentation, 2014, Changsha/Zhangjiajie, China
Abstract
An eddy current excitation signal source was designed based on the linear control theory. By analyzing the interference and characteristics of signal source, a multi-input-single-output (MISO) feedback control system was designed and created using a lock-in amplifier, and an eddy current sensor was applied in the feedback loop of the system. As a result, the noise in the loop circuit was suppressed; this resolved the current instability problem in eddy current sensor. Furthermore, a mathematical model was established, and the stability and bandwidth of the system were verified by simulations. Compared with the traditional signal sources, experimental results show that this signal source had steadier current output, smaller temperature drift and stronger load capability. Therefore, the foil thickness measurement based on this signal source had a very high accuracy.
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Guodong Jiang, Guodong Jiang, Po Li, Po Li, } "An excitation signal source with anti-interference ability for eddy current testing", Proc. SPIE 9446, Ninth International Symposium on Precision Engineering Measurement and Instrumentation, 944616 (6 March 2015); doi: 10.1117/12.2180731; https://doi.org/10.1117/12.2180731
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