3~5μm红外天空亮度测量的多元定标模型
发布时间:2018-05-09 04:36
本文选题:红外 + 天空亮度 ; 参考:《红外与激光工程》2017年10期
【摘要】:传统一元定标法测量红外天空亮度,面临诸多困难,如测量易受环境温度变化影响、仪器动态范围不足等。提出增加积分时间为自变量的二元定标模型,解决了仪器动态范围不足的问题;然后通过改变环境温度的系列实验,掌握了二元定标模型中仪器辐射随环境温度变化的规律;基于此,提出再增加环境温度为自变量的三元定标模型。实验数据表明,三元模型与实测数据拟合程度很高,相关系数为1.000,模型参数a、b、d,95%置信度的相对不确定度均小于0.82%,当环境保持某一温度不变时,三元模型退化为二元模型,各模型参数稳定,其相对偏差小于0.6%。最后,通过红外天空亮度实测,验证并比较了三元和二元定标模型;结果表明,三元模型定标测量法使用条件宽泛,既扩大了仪器动态范围,又不受环境温度变化影响;更重要的是,不再需要现场定标,提高了测量精度和测试效率。
[Abstract]:It is difficult to measure the brightness of infrared sky by traditional calibration method, for example, the measurement is easy to be affected by the change of environment temperature, the dynamic range of instrument is insufficient, and so on. A binary calibration model with increasing integral time as independent variable is proposed to solve the problem of insufficient dynamic range of the instrument, and then through the series of experiments of changing the ambient temperature, the law of the variation of the instrument radiation with the ambient temperature in the binary calibration model is grasped. Based on this, a ternary calibration model with additional ambient temperature as independent variable is proposed. The experimental data show that the fitting degree between the ternary model and the measured data is very high, the correlation coefficient is 1.000, and the relative uncertainty of the 95% confidence degree of the model parameter is less than 0.82.The ternary model degenerates into a binary model when the environment keeps a certain temperature constant. The parameters of each model are stable and the relative deviation is less than 0.6. Finally, the ternary calibration model and binary calibration model are verified and compared by infrared sky luminance measurement. The results show that the ternary model calibration method is widely used, which not only expands the dynamic range of the instrument, but also is not affected by the change of ambient temperature. More importantly, there is no need for field calibration, which improves the accuracy and efficiency of measurement.
【作者单位】: 中国科学院云南天文台;中国科学院大学;中国科学院天文大科学研究中心;昆明物理研究所;云南师范大学;
【基金】:国家自然科学基金联合基金(U1231117,U1431122) 江苏省自然科学基金(BK20170566) 物质科学前沿与交叉研究Ⅱ(红太阳物理)
【分类号】:P111;TN21
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1 郝允祥,张保洲;夜间天空亮度及其测量[J];云南天文台台刊;1996年03期
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