Parameters Simulation in Line Laser Scanning Thermography Nondestructive Testing
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摘要: 线激光扫描热成像无损检测技术使用线形激光作为热激励源，采取扫描加热方式，在碳纤维复合材料无损检测方面具有独特优势。在分析线激光扫描红外热成像检测原理以及复合材料特点的基础上，提出了扫描方向、扫描速度、激光功率等3个可能影响检测效果的参数。建立线激光扫描检测复合材料的仿真模型，选取缺陷表面中心点和无缺陷处表面温度的最大温差作为检测效果的特征量，分析了上述参数对检测效果的影响，并对激光功率、扫描速度与检测效果之间关系进行了拟合，总结了实验时兼顾检测效率和检测效果的参数选取原则。Abstract: Line laser scanning thermography is a nondestructive testing technology that uses a line laser as a thermal excitation source and adopts a scanning heating method. It has unique advantages in the nondestructive testing of carbon fiber composites. Here, three parameters that may affect the detection, namely, scanning direction, scanning speed, and laser power, were identified by analyzing the line laser scanning thermography technique and characteristics of composite materials. A simulation model for the detection of composite materials using line laser scanning was established, and the maximum temperature difference between the center point of the defect surface and surface temperature of the defect-free area was selected as the characteristic quantity for detection. The influence of the above parameters on detection was analyzed, and the relationship between the laser power, scanning speed, and detection was fitted. Based on this, the principle of parameter selection considering detection efficiency during the experiment is summarized.
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图 5 不同扫描方向缺陷表面温度曲线
Figure 5. Defect surface temperature in different scanning directions
图 6 不同扫描方向下缺陷表面温差
Figure 6. Defect surface temperature difference in different scanning directions
图 7 不同激光功率下缺陷表面温度曲线
Figure 7. Defect surface temperature curves with different laser power
图 8 不同激光功率下缺陷表面温差
Figure 8. Defect surface temperature difference with different laser power
图 10 不同激光扫描速度下缺陷表面温度曲线
Figure 10. Defect surface temperature curves at different laser scanning speeds
图 11 不同激光扫描速度下缺陷表面温差
Figure 11. Defect surface temperature difference at different laser scanning speeds
表 1 模型材料参数
Table 1. Model material parameters
Properties CFRP Air(25℃) Density ρ/(kg/m3) 1536 1.186 Specific heat capacity c/[J/(kg·K)] 865 1005 Thermal conductivity k/[W/(m·K)] 4.2(kx) 0.0261 0.56(ky) 0.56(kz) 
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表 2 激光扫描功率和最大温差数据
Table 2. Data of laser scanning power and ΔTmax
Laser scanning power /W Maximum temperature difference ΔTmax/℃ Original value Normalized value (x) Original value Normalized value (y) 10 0.3333 6.921 0.2991 14 0.4667 9.916 0.4285 20 0.6667 14.652 0.6332 24 0.8 18.521 0.8004 30 1 23.139 1
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表 3 激光扫描速度和最大温差数据
Table 3. Data of laser scanning speeds and ΔTmax
Laser scanning speeds Maximum temperature difference ΔTmax Original value Normalized value x Original value Normalized value y 5 0.1 14.652 1 10 0.2 7.655 0.5225 20 0.4 3.849 0.2627 40 0.8 1.938 0.1323 50 1 1.415 0.0966
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