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Reda, I., Zeng, J., Schulch, J., Hanssen, L., Wilthen, B., Myers, D. and Stoffel, T. (2011) An Absolute Cavity Pyrgeometer to Measure the Absolute Outdoor Longwave Irradiance with Traceability to International System of Units, SI. Journal of Atmospheric and Solar-Terrestrial Physics, 77, 132-143.
https://doi.org/10.1016/j.jastp.2011.12.011

has been cited by the following article:

• TITLE: Using an Absolute Cavity Pyrgeometer to Validate the Calibration of a Secondary Standard Pyrgeometer Outdoors, Independent from the Reference Value of the Atmospheric Longwave Irradiance

  AUTHORS: Ibrahim Reda, Afshin Andreas, Peter Gotseff, Mark Kutchenreiter

  KEYWORDS: Absolute Cavity Pyrgeometer, ACP, Pyrgeometer, WISG, Atmospheric Longwave Irradiance

  JOURNAL NAME: Atmospheric and Climate Sciences, Vol.10 No.4, September 29, 2020

  ABSTRACT: Accurate measurements of broadband outdoor longwave irradiance are important for renewable energy applications and the study of the atmosphere and climate change. A unique method of pyrgeometer calibration has been developed to improve the measurement uncertainty [1]. The results of this method yielded irradiance values within ±3 W/m2 of those traceable to the World InfraRed Standard Group (WISG). This article describes a technique for validating this pyrgeometer calibration method using two Absolute Cavity Pyrgeometers (ACPs). The ACPs and pyrgeometer model PIR were deployed outdoors and the irradiance measured by the PIR was compared against the average irradiance measured by the two ACPs. The irradiance measured by the PIR was calculated using two equations, NREL equation and the Physikalisch Meteorologisches Observatorium Davos (PMOD) equation. The uncertainty with 95% confidence level (U95) of the irradiance measured by the PIR using NREL equation equaled ±3.51 W/m2 with respect to SI and using PMOD equation U95 equaled ±2.99 W/m2 with respect to SI. These results suggest that the PIR calibration method might be useful in addressing the international need for a secondary standard pyrgeometer traceable to SI.