In this work we show that laser-spot step-heating thermography allows measuring the thermal diffusivity of solids accurately. It consists in illuminating the sample surface with a continuous-wave focused laser spot and recording the time evolution of the surface temperature with an infrared camera. The inherent noise associated to time domain measurements is reduced by applying a very simple image processing procedure. The methodology has been tested on reference samples. Unlike laser spot lock-in (or pulsed) thermography, a step-heating thermography device can be easily put together combining a low-end laser and an entry level IR camera.

中文翻译：

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激光点阶梯加热热成像测量固体的热扩散率

在这项工作中，我们展示了激光点步进加热热成像可以准确测量固体的热扩散率。它包括用连续波聚焦激光点照射样品表面，并用红外摄像机记录表面温度的时间演变。通过应用非常简单的图像处理程序，可以减少与时域测量相关的固有噪声。该方法已在参考样品上进行了测试。与激光点锁定（或脉冲）热成像不同，步进加热热成像设备可以轻松地将低端激光器和入门级红外热像仪组合在一起。