Cooper J E, Luther M R
Appl Opt. 1980 Jun 1;19(11):1798-803. doi: 10.1364/AO.19.001798.
An analysis of the thermal response of a fused silica hemispherical dome filter in a wide field-of-view (WFOV) shortwave radiometer for obtaining earth radiation budget measurements is presented. The impact of the filter thermal response on the dc detector (a thermopile) and on the resulting measurement uncertainty is evaluated. It is shown that the hemispherical filter material maintains neither a uniform nor constant temperature distribution as it responds to changes in the radiation emitted from earth. Accurate determination of terrestrial shortwave irradiance requires knowledge of the dome filter thermal response because the thermopile responds to changes in the dome temperature as well as the shortwave scene. Data are presented that show that variations in the dome temperature distribution from calibration conditions can result in a measurement uncertainty of several W/m(2) if not properly accounted for in the interpretation f the measurement. Design approaches, ground calibration, and data reduction techniques that can reduce this measurement uncertainty by an order of magnitude are presented.
本文对用于获取地球辐射收支测量数据的宽视场（WFOV）短波辐射计中熔融石英半球形穹顶滤光片的热响应进行了分析。评估了滤光片热响应对直流探测器（热电堆）以及由此产生的测量不确定度的影响。结果表明，半球形滤光片材料在响应地球发射的辐射变化时，既不能保持均匀的温度分布，也不能保持恒定的温度分布。准确测定地面短波辐照度需要了解穹顶滤光片的热响应，因为热电堆会对穹顶温度的变化以及短波场景做出响应。给出的数据表明，如果在测量解释中没有适当考虑，校准条件下穹顶温度分布的变化可能会导致几W/m²的测量不确定度。本文还介绍了可以将这种测量不确定度降低一个数量级的设计方法、地面校准和数据处理技术。
