Research on a new electromagnetic acoustic detection technique for restraining the electromagnetic interference blind zone
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TH87TP2129TP211+5

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    Abstract:

    For the electromagnetic acoustic testing, the transmitter coil utilizes the strong pulse current that excites the ultrasonic wave. It will cause the electromagnetic interference on the receiver coil. During the period of electromagnetic interference, the receiver coil is out of order and needs time to be stable. Thus, there is the electromagnetic interference blind zone. To solve this problem, this study proposes a new electromagnetic acoustic testing technique to restrain the electromagnetic interference blind zone. In this technique, a special receiver coil is utilized. On one hand, the distance between two adjacent lines in the coil structure satisfies the acoustic inphase matching relationship. On the other hand, the mutual inductance between the receiver coil and the transmitter coil is 0. In this way, it can be decoupled from the pulse excitation system. This study analyzes the principle of restraining the electromagnetic interference by the new technique. The theoretical design method of the special receiver coil is illustrated. Finally, by using this technique, the electromagnetic interference is suppressed by 948%, which proves its effectiveness.

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  • Online: April 19,2022
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