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首页> 外文期刊>Journal of Heat Transfer >Impact of Pulse Length on the Accuracy of Defect Depth Measurements in Pulse Thermography
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Impact of Pulse Length on the Accuracy of Defect Depth Measurements in Pulse Thermography

机译：脉冲长度对脉冲热成像中缺陷深度测量精度的影响

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Pulse thermography (PT) is a nondestructive testing method in which an energy pulse is applied to a surface while the surface temperature evolution is measured to detect sub surface defects and estimate their depth. This nondestructive test method was developed on the assumption of instantaneous surface heating, but recent work has shown that relatively long pulses can be used to accurately determine defect depth in polymers. This paper examines the impact of varying input pulse length on the accuracy of defect depth quantification as a function of the material properties. Simulations using both thermoplastics and metals show that measurement error is dependent on a nondimensionalized pulse length. The simulation results agree with experimental results for three-dimensional (3D) printed acrylonitrile butadiene styrene (ABS) and polylactic acid (PLA) components. Analysis and experiments show that defects can be accurately detected with minor modification to the standard methods as long as the pulse ends before the characteristic defect signal is detected.
机译：脉冲热成像（PT）是一种无损测试方法，其中，在测量表面温度变化以检测表面下缺陷并估算其深度的同时，向表面施加能量脉冲。这种无损检测方法是在瞬时表面加热的假设下开发的，但是最近的工作表明，可以使用相对较长的脉冲来准确确定聚合物中的缺陷深度。本文研究了变化的输入脉冲长度对缺陷深度定量精度与材料性能的关系。使用热塑性塑料和金属进行的模拟表明，测量误差取决于无量纲的脉冲长度。仿真结果与三维（3D）印刷的丙烯腈丁二烯苯乙烯（ABS）和聚乳酸（PLA）组件的实验结果一致。分析和实验表明，只要在检测到特征缺陷信号之前脉冲结束，只需对标准方法稍加修改即可准确地检测出缺陷。

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