| 关紫琦,廖作雨,刘天阳,贾九红.弯折波导杆的超声斜入射方法*[J].,2024,43(3):591-598 |
| 弯折波导杆的超声斜入射方法* |
| The ultrasonic oblique incidence method of fold waveguide bar |
| 投稿时间：2022-11-30 修订日期：2024-05-04 |
| 中文摘要: |
| 波导杆技术是一种有效的超声辅助检测方法,在提升高温关键承压设备安全运行方面具有重要作用。现有的波导换能器因直入式发射声波,常被用来在线监测壁厚的腐蚀进程,难以对指定方向的缺陷进行有效检测。为了解决这个难题，基于斯涅耳定理以及导波的频散特性提出了一种弯折结构的波导杆来实现超声斜入射。首先分析了弯折波导杆中水平剪切波的传播特性,探究了波导杆的厚度、弯折角度对杆中声波传播的影响规律；然后，进一步研究了弯折波导杆在半无限空间内的声束指向性；最后通过一对弯折波导杆在线检测结构内部缺陷的试验证明了波导超声斜入射的应用价值。研究结果为基于斜入射技术的波导超声在线监测提供了坚实的理论基础。 |
| 英文摘要: |
| Waveguide bar technology has proven to be the most promising method for high-temperature ultrasonic inspection, playing an important role in ensuring the safe operation of pressure-bearing equipment and other aspects. Existing waveguide transducers are often used to monitor the corrosion process of wall thickness online due to the direct-entry emission of acoustic waves, which makes it difficult to effectively detect defects in the specified direction. To solve this problem, this paper proposes a waveguide bar with a bending structure based on the Snell theorem and the dispersion characteristics of guided waves to realize ultrasonic oblique incidence. The propagation characteristics of the horizontal shear wave in the fold waveguide bar are first analyzed, and the influences of the thickness and bending angle of the bar on the propagation of the acoustic wave in the bar are discussed; in addition, the directivity of the acoustic beam in the semi-infinite space of the fold waveguide bar is further investigated. Finally, the application value of waveguide ultrasonic oblique incidence is demonstrated by a pair of fold waveguide bars for online detection of structural internal defects. These results provide a solid theoretical basis for the online monitoring of waveguide ultrasound based on the oblique incidence technique. |
| DOI：10.11684/j.issn.1000-310X.2024.03.015 |
| 中文关键词: 水平剪切波 弯折波导杆 斜入射 缺陷监测 |
| 英文关键词: Shear horizontal wave Fold waveguide bar Oblique incidence Defect detection |
| 基金项目:国家自然科学基金项目（面上项目，重点项目，重大项目）(52175138) |
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