Experimental study on ultrasonic bulk field induced by oblique laser
-
摘要: 为研究微烧蚀状态下圆形光斑斜入射时激光超声声场的指向性，使用脉冲激光辐照半圆柱形铝质工件表面，并使用压电探头和电磁超声探头分别接收纵波和横波信号。根据速度参数确定了超声信号的类型，提取了信号的峰-峰值，并绘制出声场指向性曲线。通过分析获得以下结论：激光斜入射角度在0~60范围内变化时，纵波声场的声束轴线方向保持不变，且与工件内法线平行；另外，横波声场的峰-峰值仍然在35的方向上取最大值，但是横波指向图形的主瓣易受激光入射方向的影响，当倾斜角度大于等于45时，横波主瓣的范围变得较宽。Abstract: The directivity patterns of the ultrasonic field induced by an oblique laser are investigated. The longitudinal wave and shear wave are respectively received by a piezoelectric transducer and an electromagnetic acoustic transducer in a state of micro ablation. At first, according to the ultrasound speeds, the signal types are determined. Then the directivity patterns are obtained by drawing peak to peak curve in the polar coordinate. The directivity patterns with normal axis of longitudinal wave do not change obviously for incidence angles in the range of 0-60, and angles for the maximum amplitude of shear wave still remain at 35 and -35. However, the main lobe of the directivity patterns for shear wave is sensitive to the incidence angle. In another word, shear wave amplitude near the normal increases with the incidence angle, especially when the inclined angle is no less than 45.
-
Key words:
- laser ultrasound /
- oblique laser /
- ablation mechanism /
- ultrasonic field /
- directivity patterns
期刊类型引用(8)
1. 郑伟伟，马世榜. 利用激光-电磁超声检测钛钢复合板脱粘. 应用激光. 2022(05): 102-108 . 
百度学术2. 郑伟伟，马世榜. 基于横波衍射法应用激光-电磁超声检测内部缺陷. 激光与红外. 2022(11): 1622-1628 . 百度学术3. 宋艳，马世榜. 利用激光超声纵波的衍射信号测量开口裂纹. 激光与红外. 2021(01): 9-14 . 百度学术4. 宋艳，马世榜，张开飞. 热弹激光超声激励及缺陷检测的有限元分析. 激光技术. 2021(02): 246-251 . 百度学术5. 王玉庆，王云霞，马世榜. 基于衍射横波的裂纹激光超声检测方法. 激光技术. 2019(04): 110-114 . 百度学术6. 贾中青，张振振，姬光荣. 离焦量对激光超声测厚信号影响的理论和实验研究. 红外与激光工程. 2017(S1): 13-18 . 百度学术7. 闫政. 激光超声波探测中的智能感应设备的优化设计. 激光杂志. 2016(12): 34-38 . 百度学术8. 马健，赵扬，张振振，高岩，孙继华，巨阳. 斜入射激光支持燃烧波时纵波声场的指向性. 强激光与粒子束. 2016(02): 25-29 . 本站查看其他类型引用(7)
-
点击查看大图
计量
- 文章访问数: 1111
- HTML全文浏览量: 173
- PDF下载量: 219
- 被引次数: 15
下载:
