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- Saito Shigemi
- School of Marine Science and Technology, Tokai University, Orido, Shimizu 424-8610, Japan
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- Tsubono Tomoko
- School of Marine Science and Technology, Tokai University, Orido, Shimizu 424-8610, Japan
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- Kamata Norifumi
- School of Marine Science and Technology, Tokai University, Orido, Shimizu 424-8610, Japan
書誌事項
- タイトル別名
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- Ultrasonic Electronics. Experiment on Acoustic Field of Parametric Focusing Source.
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抄録
The acoustic field of a parametric focusing source is experimentally examined. It is found that the theoretical beam sharpness and focusing of the difference frequency sound are primarily due to a less-cumulative sound generated near a strong virtual source located at the focus. Since the amplitude of the difference frequency sound on the focal plane is very weak compared to the primary sound, the signals received by a hydrophone may be dominated by false signals due to the nonlinear response of the hydrophone. Employing the primary sound of frequencies as high as 5 MHz to attain high conversion efficiency, the characteristic of the narrow beam at the focus is demonstrated by observing the signal reflected by a small reflector set at the focal plane. When a highly dissipative medium covers a target to be detected by the parametric focusing source, the difference frequency sound is markedly reduced and the beam sharpness is significantly degraded at the range of the target.
収録刊行物
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- Japanese Journal of Applied Physics
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Japanese Journal of Applied Physics 41 (5B), 3159-3162, 2002
The Japan Society of Applied Physics
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キーワード
詳細情報 詳細情報について
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- CRID
- 1390282681231070592
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- NII論文ID
- 110006341341
- 210000051405
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- NII書誌ID
- AA10457675
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- ISSN
- 13474065
- 00214922
- http://id.crossref.org/issn/13474065
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- NDL書誌ID
- 6179880
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可