Miles P A
Appl Opt. 1977 Nov 1;16(11):2897-901. doi: 10.1364/AO.16.002897.
In conventional laser calorimetry, the surface and bulk absorption coefficients are normally derived from experiments on a series of samples of graduated length. The measurement of transients in the heating of long bar samples has also been used for this purpose. This paper describes a third analytic technique for calorimetry on bar samples, namely, the direct observation of the temperature profile established after the initial transients have subsided. With care, this technique should provide accurate measures of both bulk and surface absorptions. In particular, it will show variations of bulk coefficient along the bar as well as the asymmetric surface losses that are expected as a result of Fresnel reflections.
在传统的激光量热法中，表面吸收系数和体吸收系数通常是通过对一系列长度渐变的样品进行实验得出的。长棒状样品加热过程中的瞬态测量也用于此目的。本文介绍了一种用于棒状样品量热法的第三种分析技术，即直接观察初始瞬态消退后建立的温度分布。如果操作得当，该技术应能准确测量体吸收和表面吸收。特别是，它将显示沿棒体的体吸收系数变化以及由于菲涅尔反射预期会出现的不对称表面损耗。
