電流励磁構造をもつ電磁超音波探触子による超音波の発生

カテゴリ: 論文誌(論文単位)

グループ名: 【A】基礎・材料・共通部門

発行日: 2011/11/01

タイトル(英語): Evaluation of Ultrasonic Wave Generation using Electromagnetic Acoustic Transducer with Current Driven Circuit

著者名: 大塚　裕介（大阪大学工学研究科）

著者名(英語): Yusuke Ohtsuka (Graduate School of Engineering, Osaka University)

キーワード: 超音波，電磁超音波探触子，薄膜型，パルスフォーミングネットワーク回路　　ultrasonic wave，electromagnetic acoustic transducer，current driven circuit，pulse forming network

要約(英語): Characteristic of electromagnetism for a current driven electromagnetic acoustic transducer (EMAT) was estimated using numerical calculation method. High magnetic flux density above 2 T may be achieved by multi-layers piled up the conductors with 50 μm in thickness as a current circuit. This estimated value is much larger than that generated by the EMAT with the permanent magnets. The time variation of the current passing through the conductive layers depends on the characteristic impedance of the pulse forming network circuit. In the case of the larger value of the characteristic impedance compared with that of the internal resistance, the rectangular current was nearly obtained as a function of time. In contract, the current was exponentially decreased for the lower characteristic impedance. However, the time variation of the current supplied by the pulse forming network circuit may affect to only the value of the sound pressure at the detect point of ultrasonic wave.

本誌: 電気学会論文誌A（基礎・材料・共通部門誌） Vol.131 No.11 （2011）

本誌掲載ページ: 900-907 p

原稿種別: 論文／日本語

電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejfms/131/11/131_11_900/_article/-char/ja/