Temperature dependent polarization of the thermal radiation emitted by thin, hot tungsten wires
Temperature dependent polarization of the thermal radiation emitted by thin, hot tungsten wires
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DOI：
10.1016/j.ijthermalsci.2015.12.020
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发表时间：
2013-03
期刊：
影响因子：
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通讯作者：
A. F. Borghesani;G. Carugno
中科院分区：
文献类型：
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作者：
A. F. Borghesani;G. Carugno
我们报告了在可见光和红外范围内，从略高于室温到熔化tm≈3700 K的范围内，由细白炽钨丝发出的热辐射的线性极化<P>的温度依赖性的测量。这是第一次在如此宽的温度范围内进行测量。我们发现<P>随t的增加而减小。基于Kirchhoff定律的理论预测可以很好地再现实验数据，如果使用drude型公式计算钨的光学性质，只要将其有效性扩展到本实验研究的范围，即λ≈15μm范围内的forTup toTmand，其有效性在文献中仅评估为forT≤2400 K。
We report measurements of the temperatureTdependence of the linear polarization <P> of the thermal radiation emitted by thin, incandescent tungsten wires in a range from a little above room temperature up to meltingTm≈ 3700 K across the visible and infrared range. These are the first measurements in such wide a temperature range. We found that <P> decreases with increasingT. The theoretical prediction based on Kirchhoff's law satisfactorily reproduces the experimental data if a Drude-type formula for the optical properties of tungsten is used, provided that its validity, assessed in literature only forT≤ 2400 K and for wavelengths in the range from visible up toλ≈ 2.6μm, is extended to the ranges investigated in the present experiment, namely forTup toTmand for λ up to ≈15μm.