Acoustic Tests in a Micro Space based on a Point Source Generated by Laser-Induced Breakdown

基于激光诱导击穿产生的点源的微空间声学测试

• 批准号: 24656158
• 负责人: HOSOYA Naoki
• 金额: $ 2.58万
• 依托单位: Shibaura Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Challenging Exploratory Research
• 财政年份: 2012
• 资助国家: 日本
• 起止时间: 2012-04-01 至 2014-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-24656158/
• 关键词: レーザーブレイクダウン; プラズマ; 衝撃波; 音響加振; シュリーレン法; 膜構造; 微小空間

This paper proposes a method of acoustic vibration testing based on a point source generated by laser-induced breakdown in the air. A high-power Nd: YAG pulse laser is used in this system for generating the laser-induced breakdown in acoustic fields. Plasma formation can be realized by the laser-induced breakdown if the local intensity of the laser beam reaches 1e+15 W/m2. The shock wave that is yielded by consuming a part of the plasma energy becomes a sound source. Assuming that the laser beam is focused to a small volume through a convex lens and the sound source by the laser induced-breakdown has nondirectional property, it is possible to create a point source with this technique. Securing the laser light path installs no device for acoustic excitation in acoustic fields. The system is validated by comparing the resonant frequencies of a micro-space measured by the laser-induced breakdown and calculated by theoretical model.

提出了一种基于激光在空气中击穿产生点源的声振动测试方法。该系统采用高功率Nd：YAG脉冲激光器，在声场中产生激光诱导击穿。当激光束的局部强度达到1 e +15 W/m2时，可以通过激光诱导击穿实现等离子体的形成。通过消耗等离子体能量的一部分而产生的冲击波成为声源。假设激光束通过凸透镜聚焦到一个小的体积，并且激光诱导击穿的声源具有无方向性，则可以用该技术产生点源。确保激光光路不安装用于声场中的声激励的装置。通过比较激光诱导击穿测量的微空间谐振频率与理论模型计算的谐振频率，验证了系统的有效性。

项目成果

非接触レーザー加振技術を用いたモーメント加振法による周波数応答関数の推定

利用非接触激光激励技术的矩激励法估计频率响应函数

• 发表时间: 2012
• 作者: Naoki Hosoya;Masaki Nagata and Itsuro Kajiwara;小林明莉,滝口康太,細矢直基,梶原逸朗
• 通讯作者: 小林明莉,滝口康太,細矢直基,梶原逸朗

Non-contact vibro-acoustic tests based on nano-second laser ablation

基于纳秒激光烧蚀的非接触振动声学测试

• 发表时间: 2013
• 作者: Naoki Hosoya;Tatsuo Inoue;Itsuro Kajiwara
• 通讯作者: Itsuro Kajiwara

Acoustic testing in a micro-space based on a point source generated by laser-induced breakdown

基于激光诱导击穿产生的点源的微空间声学测试

• 发表时间: 2012
• 作者: Naoki Hosoya;Masaki Nagata and Itsuro Kajiwara
• 通讯作者: Masaki Nagata and Itsuro Kajiwara

METHOD FOR MEASUREMENT OF VIBRATION PROPERTY OF STRUCTURE, AND VIBRATION PROPERTY MEASUREMENT DEVICE

结构振动特性的测量方法及振动特性测量装置

• 发表时间: 2012

Vibration measurement and monitoring of a rotating disk using contactless laser excitation

使用非接触式激光激励测量和监测旋转盘的振动

• 发表时间: 2013
• 作者: Itsuro Kajiwara;Naoki Hosoya
• 通讯作者: Naoki Hosoya