講演抄録/キーワード |
講演名 |
2017-05-22 15:50
円筒型音響導波路と凹面型振動子を用いたハイドロホン校正用高強度音源システムの実験評価 ○五十嵐 茂(職能開発大)・森下武志(桐蔭横浜大)・内田武吉(産総研)・竹内真一(桐蔭横浜大) US2017-19 |
抄録 |
(和) |
近年,医療分野,産業分野における高音響強度の超音波機器が増えている.我々は円筒型音響導波路と凹面型振動子を用いた高強度超音波音源システムの提案を行っている.これはハイドロホン受波感度の絶対校正に使用するために,高強度超音波を送波できる音源システムの開発を目指している.音響導波路の材質と加工法を検討して円筒型音響導波路を試作し,凹面型振動子と組み合わせた超音波音源の実験システムを構築した.中心軸上と方位方向の音圧分布を測定し,有限要素法による軸対称3次元音場解析の結果と比較した.その結果,両者の音圧分布はほぼ同等となり,特に-6 dBメインビーム幅は15%以内で一致した.現在のところ,送波開口から10 mmの位置で670 kPaの音圧を確認した. |
(英) |
In recent years, the high intensity ultrasound equipment has increased in both medical and industrial filed. Therefore, we have proposed high intensity ultrasound source system by using a cylindrical acoustic waveguide and a concave transducer. It is aimed at the development of ultrasound source which is able to transmit high intensity ultrasound waves for absolute calibrations for receiving sensitivity of hydrophones. Furthermore, we constructed the experimental ultrasound source system using the concave transducer and the cylindrical acoustic waveguide which was fabricated by considering material selection and cutting methods of closed cell type sponge. The spatial distributions of acoustic pressure on central axis and lateral axis for our fabricated ultrasound source were measured, it was found that the acoustic pressure distributions were similar between measured results and simulated results using axisymmetric three-dimensional acoustic filed simulation by finite element method, in particular, measured and simulated -6 dB main beam width was matched within 15%. In this paper, acoustic pressure of 670 kPa was confirmed at position 10 mm from transmitting aperture on the central axis. |
キーワード |
(和) |
音響導波路 / 超音波音源 / ハイドロホン / 感度校正 / 振動子 / / / |
(英) |
Acoustic waveguide / Ultrasound source / Hydrohpne / Sensitivity calibration / Transducer / / / |
文献情報 |
信学技報, vol. 117, no. 41, US2017-19, pp. 27-32, 2017年5月. |
資料番号 |
US2017-19 |
発行日 |
2017-05-15 (US) |
ISSN |
Print edition: ISSN 0913-5685 Online edition: ISSN 2432-6380 |
著作権に ついて |
技術研究報告に掲載された論文の著作権は電子情報通信学会に帰属します.(許諾番号:10GA0019/12GB0052/13GB0056/17GB0034/18GB0034) |
PDFダウンロード |
US2017-19 |