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Impedance Matching Using Variable Capacitors in Electromagnetic Ultrasonic Flaw Detection
Yoshihiro Nishimura, Naoki Akimoto, Katsumi Fukuda, Takeharu Hayashi, Eiki Ikeda, Ginji Uchibe
165 - 172
10.3233/978-1-61499-767-2-165
Studies in Applied Electromagnetics and Mechanics
Volume 42: Electromagnetic Nondestructive Evaluation (XX)
Abstract

Centrifugal casting tubes have uneven surfaces and cannot be inspected by Ultrasonic Testing (UT). Therefore, not all products are checked. Electromagnetic acoustic tests (EMATs) were conducted on centrifugal casting tubes, and their effectiveness was examined. However, signals derived by EMAT is very poor and weak. Acoustic attenuation of centrifugal casting tubes is very high due to their large grains. We developed a C-C impedance-matching circuit to produce electromagnetic acoustic waves, applied it to aluminum specimens, and examined the C-C matching effectiveness.

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