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Suitability of acrylic and copper globe thermometers for diurnal outdoor settings

机译:丙烯酸和铜制地球温度计适合于室外日间使用

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The globe thermometer has been commonly used as a meteorological instrument for measuring the mean radiant temperature for at least 80 years. Originally it consisted of a hollow copper sphere. In recent years, the acrylic globe thermometer has also become widely used for outdoor measurements because of its fast response and being more economical to produce. However it has been found that the mean radiant temperature measured by an acrylic globe thermometer is mostly inconsistent with that of the more accurate three-dimensional integral method. To investigate why such a discrepancy occurs, static indoor experiments and dynamic outdoor experiments were conducted to compare and explore the thermal response of both a copper and an acrylic globe thermometer. The measurements were also compared with theoretical predictions. In addition, the spatial distributions of temperature on the exterior surface and along the interior axis of the globe were measured. The effect of surface optical properties was also discussed. The primary reasons for the temperature differences between copper and acrylic globe thermometer are analysed. Based on above analysis, we conclude that the acrylic globe thermometer is not suitable for the measurement of outdoor diurnal mean radiant temperature. The conclusions are then generalized to metallic and non-metallic globes. (C) 2015 Elsevier Ltd. All rights reserved.
机译:球形温度计至少在80年来一直被用作测量平均辐射温度的气象仪器。它最初由空心的铜球组成。近年来,丙烯酸球温度计由于其响应速度快且生产更经济,也已广泛用于户外测量。然而,已经发现,用丙烯酸球温度计测量的平均辐射温度与更精确的三维积分法的温度辐射不一致。为了调查为什么会出现这种差异,进行了静态室内实验和动态室外实验,以比较和探索铜和丙烯酸球形温度计的热响应。还将测量结果与理论预测值进行了比较。另外,测量了外表面和沿地球的内轴的温度的空间分布。还讨论了表面光学性能的影响。分析了铜和丙烯酸球形温度计之间温差的主要原因。根据以上分析,我们得出结论,丙烯酸球形温度计不适合用于测量室外日平均辐射温度。然后将结论推广到金属和非金属地球仪。 (C)2015 Elsevier Ltd.保留所有权利。

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