Research on controllability of radiation direction of nondiffiracting ultrasonic beam by non-concentric annular array sound source

非同心环形阵列声源非衍射超声束辐射方向可控性研究

• 批准号: 15560355
• 负责人: MASUYAMA Hiroyuki
• 金额: $ 1.28万
• 依托单位: Toba National College of Maritime Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15560355/
• 关键词: Transducer Array; Annular Array; Nondiffracting Beam; Decentering; Beam Scanning; Noncontacting measurement; Complex Sound Field; Visualization; 超音波ビーム; 非回折ビーム; 方向可変; ベッセルビーム; 空隙

The purpose of this research is forming the ultrasonic beam without diffracting, by constructing sound source using non-concentric annular array, and making the radiation direction of beams controllable.At first, by conducting decentering for the annular array in which clearances exist between elements, it was confirmed that changing the direction of radiated beam becomes possible. By numerical analyses, it is shown that the beam radiated to the direction of 15 degrees from the sound axis, by the array with ten elements, still keeps a sharp profile. And, it was shown that the radiation of narrow beams was possible for the direction deviated from the sound axis, even when the number of array element was small. In addition, effects caused by the fluctuation of the decentering ratio in each element were verified, and relations between actually decentered element and vertical distance where the direction of beams deviates were found.Continuously, examinations on the configuration of source element, for effectively changing of the beam direction, were carried out, and it was confirmed that the direction of beams propagated without diffraction was variable, when the number of decentering element was minimized, and that the possibility as a precise parallel scanning method of the beam was found. Besides, the technique for setting the propagation path of beam more in detail was examined, and the technique that obtains beams with the twisted propagation path was found.Furthermore, as a means for carrying out measurement experiments, techniques for measuring sound fields were also examined. Noncontact and noninvasive measuring systems for sound fields were constructed based on the optical technique using two kinds of interferometers. Measurement experiments using general sound sources were carried out, and in the visualization of two-dimensional complex distribution of radiated fields, results with the tendency that agreed with numerical results well were obtained.

本研究的目的是通过采用非同心环形阵列构建声源，形成无衍射的超声波束，并使波束的辐射方向可控。首先，通过对元件之间存在间隙的环形阵列进行偏心，已证实改变辐射光束的方向是可能的。数值分析表明，十单元阵列向距声轴15°方向辐射的波束仍保持清晰的轮廓。并且，结果表明，即使阵列单元的数量很少，也可以在偏离声轴的方向上发射窄波束。此外，还验证了各单元偏心比波动所造成的影响，并找到了实际偏心单元与光束方向偏离的垂直距离之间的关系。不断研究源单元的配置，以有效改变进行了光束方向的研究，并确认当偏心元件的数量最小化时，没有衍射的光束传播方向是可变的，并且发现了作为光束的精确平行扫描方法的可能性。此外，还研究了更详细地设置波束传播路径的技术，并找到了获得具有扭曲传播路径的波束的技术。此外，作为进行测量实验的手段，还研究了测量声场的技术。基于光学技术，使用两种干涉仪构建了非接触式、非侵入式声场测量系统。利用一般声源进行了测量实验，在辐射场二维复杂分布的可视化中，得到了与数值结果具有良好吻合趋势的结果。

项目成果

円環アレイによる放射方向可変型音源

使用圆形阵列的可变辐射方向声源

• 发表时间: 2004
• 期刊: 超音波テクノ 16
• 作者: Hiroyuki Masuyama;Koichi Mizutani;Keinosuke Nagai;Hiroyuki Masuyama;Hiroyuki Masuyama;Takeshi Obuchi;増山裕之;Manabu Nemoto;Hiroyuki Masuyama;Hiroyuki Masuyama;増山裕之
• 通讯作者: 増山裕之

Effect of Decentering Ratio Fluctuation of Annular Array Element on Direction-Variable Beam

环形阵元偏心比波动对变向光束的影响

• 发表时间: 2003
• 期刊: Proceedings of Symposium on Ultrasonic Electronics (in Japanese) 24
• 作者: Hiroyuki Masuyama;Koichi Mizutani;Keinosuke Nagai
• 通讯作者: Keinosuke Nagai

根本学: "マッハツェンダ干渉計を用いる複素音場の測定"第24回超音波エレクトロニクスの基礎と応用に関するシンポジウム講演論文集. 209-210 (2003)

基础知识：“使用 Mach-Zehnder 干涉仪测量复杂声场”第 24 届超声波电子学基础与应用研讨会论文集 209-210 (2003)。

Tomohiro Ezure: "Optical Measurement of Sound Fields with Diffraction-Effect Using Mach-Zehnder Interferometer"Japanese Journal of Applied Physics. 42・12. 7599-7600 (2003)

Tomohiro Ezure：“使用马赫曾德尔干涉仪对声场进行光学测量”，日本应用物理学杂志 42・12（2003 年）。

Visualization of Ultrasonic Fields Using Michelson Interferometer

使用迈克尔逊干涉仪实现超声波场的可视化

• 发表时间: 2004
• 期刊: Proceedings of Symposium on Ultrasonic Electronics 25
• 作者: Hiroyuki Masuyama;Koichi Mizutani;Keinosuke Nagai;Hiroyuki Masuyama;Hiroyuki Masuyama;Takeshi Obuchi
• 通讯作者: Takeshi Obuchi