Laser arrays scanning thermography with optimized excitation signals for efficient rail defect detection

IF 4.1 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Ndt & E International Pub Date : 2025-06-03 DOI:10.1016/j.ndteint.2025.103461

Kang Tian, Jianping Peng, Qian Zhang, Fuben Zhang, Jinlong Lee

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引用次数: 0

Abstract

Laser Arrays Scanning Thermography (LAsST) leverages the advantages of multi-point laser by dynamically modulating the laser excitation signal, concentrating energy to amplify defect temperature differences, thereby enhancing the sensitivity of surface defect detection. Starting from the principles of dynamic laser modulation, and combining simulations of heat transfer and imaging, the superiority of dynamic laser modulation heating over other scenarios is demonstrated. Additionally, the relationship between thermography parameters and dynamic detection capabilities is analyzed. A comprehensive detection metric for defect signals was designed, and high-speed dynamic detection experiments were conducted on actual rail samples. The results demonstrate that the optimized dynamic modulated signal significantly increases the temperature difference for rail defect detection. Meanwhile, under the conditions of safe laser power and an economical thermography, high-speed dynamic detection at 10 km/h was achieved.

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优化激励信号的激光阵列扫描热成像技术用于轨道缺陷的有效检测

激光阵列扫描热成像（LAsST）利用多点激光的优势，通过动态调制激光激发信号，集中能量放大缺陷温差，从而提高表面缺陷检测的灵敏度。从激光动态调制的原理出发，结合热传递和成像模拟，论证了激光动态调制加热相对于其他场景的优越性。此外，分析了热成像参数与动态检测能力之间的关系。设计了缺陷信号综合检测指标，并在实际钢轨样品上进行了高速动态检测实验。结果表明，优化后的动态调制信号显著提高了钢轨缺陷检测的温度差。同时，在安全的激光功率和经济的热成像条件下，实现了10 km/h的高速动态检测。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Ndt & E International 工程技术-材料科学：表征与测试

CiteScore

7.20

自引率

9.50%

发文量

121

审稿时长

55 days

期刊介绍： NDT&E international publishes peer-reviewed results of original research and development in all categories of the fields of nondestructive testing and evaluation including ultrasonics, electromagnetics, radiography, optical and thermal methods. In addition to traditional NDE topics, the emerging technology area of inspection of civil structures and materials is also emphasized. The journal publishes original papers on research and development of new inspection techniques and methods, as well as on novel and innovative applications of established methods. Papers on NDE sensors and their applications both for inspection and process control, as well as papers describing novel NDE systems for structural health monitoring and their performance in industrial settings are also considered. Other regular features include international news, new equipment and a calendar of forthcoming worldwide meetings. This journal is listed in Current Contents.