利用多速激光锁定热成像法评估金属斜线裂纹的深度和角度

IF 3.1 3区 物理与天体物理 Q2 INSTRUMENTS & INSTRUMENTATION
C. Boué, S. Holé
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引用次数: 0

摘要

裂纹可以斜向金属表面发展。多速激光锁相热成像方法适用于以非接触方式估算金属斜线裂纹的开裂角度和深度。一个连续的激光源会定期扫描所研究的样品,从而导致周期性加热。位于热扩散区域的裂纹所引起的热扩散干扰与重复的连续激光扫描同步进行测量。裂纹的热特征是从热源不同扫描速度下的表面温度图像振幅中提取出来的。裂纹两侧获得的热特征的不对称性作为热扩散长度的函数进行分析。同时对局部裂纹深度和裂纹角度进行评估。通过三维模拟对该方法进行了解释,并通过校准的斜线裂缝进行了实验和测试。结果表明,多速激光锁定热成像方法作为一种非接触式测量工具,在评估深度达 3.5 毫米的斜裂纹形状方面具有潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Depth and angle evaluations of oblique linear cracks in metal using multi-speed laser lock-in thermography method

Cracks can develop obliquely to the metal surface. The multi-speed laser lock-in thermography method is suited for the contactless estimation of open crack angles and depths in metal with oblique linear cracks. A continuous laser source regularly scans the studied sample leading to a periodical heating. The heat diffusion disturbances induced by a crack located in the thermal diffusion area are measured synchronously with the repeated continuous laser scan passes. The thermal signature of the crack is extracted from the amplitude of surface temperature images for various scanning speeds of the thermal source. The asymmetry of the thermal signatures obtained on each side of the crack is analysed as a function of a length relying on the thermal diffusion length. The local crack depth and crack angle are evaluated simultaneously. The method, explained with 3D simulations, is experimentally implemented and tested with calibrated oblique linear cracks. The results demonstrate the potentiality of multi-speed laser lock-in thermography method as a contactless measurement tool for the evaluation of oblique crack shapes up to 3.5 mm depth.

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来源期刊
CiteScore
5.70
自引率
12.10%
发文量
400
审稿时长
67 days
期刊介绍: The Journal covers the entire field of infrared physics and technology: theory, experiment, application, devices and instrumentation. Infrared'' is defined as covering the near, mid and far infrared (terahertz) regions from 0.75um (750nm) to 1mm (300GHz.) Submissions in the 300GHz to 100GHz region may be accepted at the editors discretion if their content is relevant to shorter wavelengths. Submissions must be primarily concerned with and directly relevant to this spectral region. Its core topics can be summarized as the generation, propagation and detection, of infrared radiation; the associated optics, materials and devices; and its use in all fields of science, industry, engineering and medicine. Infrared techniques occur in many different fields, notably spectroscopy and interferometry; material characterization and processing; atmospheric physics, astronomy and space research. Scientific aspects include lasers, quantum optics, quantum electronics, image processing and semiconductor physics. Some important applications are medical diagnostics and treatment, industrial inspection and environmental monitoring.
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