Simulation of Defect Depth Detection Based on Infrared Phase Locking
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摘要: 隐藏在工件内部的粘贴结构缺陷具有隐蔽性和危险性，成为影响生产质量和运行安全的致命因素，运用红外无损检测技术可以对其缺陷进行检测和评估。本文通过仿真模拟，测得粘贴结构在不同缺陷深度以及涂层热扩散系数下的盲频率，研究了缺陷深度和涂层热扩散系数对盲频率的影响，同时利用拟合定量研究了盲频率与缺陷深度和涂层热扩散系数的关系。仿真结果表明，可以通过盲频率求得热扩散长度，进而求得缺陷深度的定量检测方法。Abstract: Defects in the paste structure inside a workpiece act as a crucial factor affecting production quality and operational safety, and infrared non-destructive testing can be used to detect and evaluate defects. In this study, the blind frequency of the paste structure at different defect depths and thermal diffusivity of the coating were measured through simulations, and the influence of the defect depth and thermal diffusivity of the coating on the blind frequency was studied. Relationship between the defect depth and thermal diffusivity of the coatings. The simulation results show that the thermal diffusion length can be obtained using the blind frequency, and a quantitative detection method for the defect depth can be obtained.
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图 1 红外锁相法检测原理示意图
Figure 1. Schematic diagram of detection principle of infrared phase-locked method
图 2 红外锁相法的频率-相位差曲线
Figure 2. Frequency phase difference curve of infrared phase- locked method
图 3 多层一维热传导模型示意图
Figure 3. Schematic diagram of multi-layer one-dimensional heat conduction model
图 4 含有粘贴缺陷的二维模型示意图
Figure 4. Schematic diagram of two-dimensional model with paste defect
图 5 粘贴缺陷的二维轴对称模型示意图
Figure 5. Schematic diagram of two-dimensional axisymmetric model of paste defect
图 7 缺陷区域和无缺陷区域表面温度随时间的变化
Figure 7. Variation of surface temperature of defect area and defect free area with time
图 8 理论分析不同缺陷深度的盲频率
Figure 8. Theoretical analysis of blind frequencies of different defect depths fb/Hz
图 9 理论分析和仿真模拟不同缺陷深度的盲频率对比
Figure 9. Comparison of blind frequencies of different defect depths through theoretical analysis and simulation
图 10 理论分析不同的涂层热扩散系数的盲频率
Figure 10. Blind frequency of theoretical analysis of different coating thermal diffusivity fb/Hz
图 11 理论分析和仿真模拟不同的涂层热扩散系数的盲频
Figure 11. Blind frequency comparison of different coating thermal diffusivity through theoretical analysis and simulation
图 12 缺陷深度与热扩散长度的关系
Figure 12. Relationship between defect depth and thermal diffusion length
图 13 不同工况下的缺陷深度与热扩散长度的比值
Figure 13. Ratio of defect depth to thermal diffusion length under different working conditions
图 14 盲频率与涂层热扩散系数和缺陷深度的平方之比拟合
Figure 14. Fitting of blind frequency to the square ratio of coating thermal diffusion coefficient and defect depth
表 1 材料热物性参数
Table 1. Material thermal property parameters
Material Density/(kg/m3) Thermal conductivity/(W/(m∙K)) Heat capacity/(J/(kg∙K)) Thermal diffusivity/(m2/s)(×10-7) Steel 7850 44.78 460 124.01 Glue 1200 0.35 270 10.80 Air 1.225 0.0242 1006.4 196.29 
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表 2 缺陷深度与涂层热扩散系数的计算工况
Table 2. Calculation conditions of defect depth and coating thermal diffusion coefficient
Thermal diffusivity/(m2/s) Defect depth/mm 5×10-7 3 4 5 6 7 8 9 10 1×10-6 3 4 5 6 7 8 9 10 5×10-6 3 4 5 6 7 8 9 10 1×10-5 3 4 5 6 7 8 9 10 5×10-5 3 4 5 6 7 8 9 10
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