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Method to intercalibrate sunphotometer constants using an integrating sphere as a light source in the laboratory

机译：在实验室中使用积分球作为光源对日光计常数进行相互校准的方法

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摘要

A calibration method is introduced to transfer calibration constants from the reference to secondary sun-photometers using a laboratory integrating sphere as a light source, instead of the traditional transferring approach performed at specific calibration sites based on sunlight. The viewing solid angle and spectral response effects of the photometer are taken into account in the transfer, and thus the method can be applied to different types of sunphotometers widely used in the field of atmospheric observation. A laboratory experiment is performed to illustrate this approach for four types of CIMEL CE318 sun-photometers belonging to the aerosol robotic network (AERONET). The laboratory calibration method shows an average difference of 1.4% from the AERONET operational calibration results, while a detailed error analysis suggests that the uncertainty agrees with the estimation and could be further improved. Using this laboratory calibration approach is expected to avoid weather influences and decrease data interruption due to operationally required periodic calibration operations. It also provides a basis for establishing a network including different sunphotometers for worldwide aerosol measurements, based on a single standard calibration reference.
机译：引入了一种校准方法，该方法使用实验室积分球作为光源将校准常数从参考传递到辅助日光光度计，而不是在特定的基于太阳光的校准位置执行传统的传递方法。在转移过程中考虑了光度计的视角立体角和光谱响应效应，因此该方法可以应用于在大气观测领域广泛使用的不同类型的日光度计。进行了一项实验室实验，以说明针对属于气溶胶机器人网络（AERONET）的四种类型的CIMEL CE318太阳光度计的方法。实验室校准方法显示出与AERONET操作校准结果的平均差为1.4％，而详细的误差分析表明，不确定度与估计值相符，并且可以进一步改善。期望使用这种实验室校准方法来避免天气影响并减少由于操作所需的定期校准操作而导致的数据中断。它还为基于单个标准校准参考建立包括用于全球气溶胶测量的不同日光计的网络提供了基础。

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