Semi-transparent materials are increasingly applied in various industrial and scientific applications. Because there is a strong coupling between optical and thermal properties of these materials, they pose unique challenges for their modelling and experimental characterization. At PTB, the facilities for spectral emissivity measurement of opaque materials have been expanded for the characterization of semi-transparent materials in the near-, mid- and far-IR region and for temperatures between 20 °C and 90 °C by using a new sample holder. The experimental realization and validation of the new facility for emissivity measurement of semi-transparent materials is presented in part 1 of this publication. Here the evaluation procedure of the measurement data obtained with the new sample-holder is discussed in detail. A model of radiative transport within semi-transparent samples considering emission, absorption, scattering and multiple reflections was formulated and solved over a wide spectral range. The model was inverted using a least squares approach and an extensive sensitivity analysis was performed.

半透明材料越来越多地应用于各种工业和科学应用中。由于这些材料的光学和热学性质之间存在很强的耦合，因此它们在建模和实验表征方面提出了独特的挑战。在PTB，使用新仪器扩展了不透明材料光谱发射率测量的设备，以表征近，中和远红外区域中的半透明材料以及20°C至90°C之间的温度。样品架。本出版物的第1部分介绍了用于半透明材料发射率测量的新设备的实验实现和验证。这里详细讨论了使用新样品架获得的测量数据的评估程序。建立了考虑了发射，吸收，散射和多次反射的半透明样品内的辐射传输模型，并在较宽的光谱范围内进行了求解。使用最小二乘法将模型反转，并进行了广泛的灵敏度分析。