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首页> 外文期刊>Quantitative Infra Red Thermography Journal >Continuous and Laplace transformable approximation for the temporal pulse shape of Xe-flash lamps for flash thermography
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Continuous and Laplace transformable approximation for the temporal pulse shape of Xe-flash lamps for flash thermography

机译：用于闪光热成像的XE-Flash灯的时间脉冲形状的连续和拉拉普拉斯可变形近似

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摘要

Flash thermography is widely used in non-destructive testing and material characterisation. The use of analytical modelling utilising the Laplace transform allows one to calculate the temperature transients of flash-heated samples and therefore characterise them by fitting of the results of model calculations to experimental data. However, for samples with high thermal diffusivity or very thin samples, the temperature transient is strongly influenced by the temporal shape of the heating pulse, especially in reflection configuration. To incorporate this into the model, the temporal shape of the heating pulse and its Laplace transform have to be known. Here we present a close phenomenological approximation of the temporal shape of pulses of Xe-flash lamps. It is a non-stitched solution, has a simple Laplace transform and is suitable for different lamps and energy settings. As an example for a practical application of the pulse shape approximation, we use it to determine the thickness of polymer samples with thicknesses down to 80m by means of flash thermography, both in transmission and reflection configuration. Using a rectangular pulse shape or a delayed Dirac pulse shape, the thickness results are very sensitive to the start time of the fit and an additional calibration is needed.
机译：闪光热成像广泛用于非破坏性测试和材料表征。利用拉普拉斯变换的分析建模的使用允许一个人计算闪蒸样品的温度瞬变，因此通过将模型计算结果拟合到实验数据来表征它们。然而，对于具有高热扩散率或非常薄的样品的样品，温度瞬变受加热脉冲的时间形状的强烈影响，尤其是反射构型。为了将其纳入模型中，必须已知加热脉冲的时间形状及其拉普拉斯变换。在这里，我们呈现了XE-闪光灯脉冲的时间形状的紧密现象近似。它是一个非缝合的解决方案，具有简单的拉普拉斯变换，适用于不同的灯和能量设置。作为脉冲形状近似的实际应用的示例，我们使用它来通过闪光热成像在传输和反射构造中确定具有厚度至80μm的聚合物样品的厚度。使用矩形脉冲形状或延迟的Dirac脉冲形状，厚度结果对拟合的开始时间非常敏感，并且需要额外的校准。

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