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非同心环形阵列构造声源，使波束的辐射方向可控，形成无绕射的超声波束。首先，通过对单元间存在间隙的环形阵列进行偏心，证实了改变辐射波束方向是可能的。数值分析表明，由10个阵元组成的阵列辐射到距声轴15°方向的波束仍然保持着尖锐的轮廓。结果表明，即使阵元数较少，当方向偏离声轴时，仍有可能产生窄波束辐射。此外，还验证了偏心比的波动对光束传输的影响，找出了实际偏心元件与光束方向偏离的垂直距离之间的关系；为了有效地改变光束方向，对光源元件的结构进行了考察，证实了在偏心元件数目最少的情况下，无衍射光束的传播方向是可变的，并发现了作为光束精确平行扫描方法的可能性。此外，还详细研究了声束传播路径的设置技术，找到了利用扭曲传播路径获得波束的技术，并作为测量实验的手段，对声场测量技术进行了研究。基于光学技术，利用两种干涉仪构建了非接触式和非侵入式声场测量系统。用普通声源进行了测量实验，在二维复杂辐射场分布的可视化中，得到了与数值计算结果相吻合的结果。

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)。

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

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）。