激光扫描热成像无损检测关键参数影响分析

对一种新型红外热波无损检测技术激光扫描热成像无损检测技术进行了研究。在深入分析检测机理的基础上建立了激光扫描热成像有限元数值计算模型，选取缺陷处和非缺陷处表面最大温差作为特征量，对样品材料、缺陷大小、缺陷深度、激光扫描速度和激光扫描功率等关键参数对激光扫描热成像检测的影响规律进行了仿真和分析，为该新技术的进一步发展和应用提供了参考；采用数据拟合方法得出了各参数和表面最大温差关系，并以此为基础提出了激光扫描热成像技术检测参数控制策略，实际检测过程中，可据此针对样品缺陷特征快速准确设置检测参数，提高检测能力。

Influence analysis of key parameters in laser scanning thermography nondestructive testing

A new Infrared Thermal Wave Nondestructive Testing technology-laser scanning thermography nondestructive testing technology was investigated in this work. A finite element simulation model was built based on the deeply analysis of detection mechanism, and the temperature difference between defect and non-defect was selected to analyze the influence rules of the key parameters such as sample material, defect size, defect depth, laser scanning speed and laser scanning power on laser scanning thermography nondestructive testing technology, which provided a reference for the further development and application of the new technology. The relationship between the parameters and the maximum surface temperature difference were numerically investigated. On this basis, the control strategy of detection parameter in the laser scanning thermography nondestructive testing technology was put forward, which can facilitate to set the detection parameters quickly and accurately for the corresponding defect characteristics of sample in actual detection process, and to improve the detection ability.