A new cavity for pyrgeometer characterizations has been built at the Infrared Radiometry Section of the World Radiation Center (WRC-IRS) at PMOD/WRC. The calculated effective emissivity of $0.99993\pm 0.00033$ was obtained from Monte Carlo simulations taking into account the geometry and the measured temperature distributions of the cavity. The cavity is operated in a temperature range of $-30°\mathrm{C}$ to $+30°\mathrm{C}$ and is initially flushed with nitrogen to reduce the relative humidity in the cavity. The estimated uncertainties of retrieved pyrgeometer parameters $k_1$ , $k_2$ , and $k_3$ are $\pm 0.024$ , $\pm 0.0008$ , and $\pm 0.03$ , respectively. The relative uncertainty of pyrgeometer sensitivity C is 0.8%. The comparison with the cavity used since 1995 at PMOD/WRC gave average differences of 0.005, 0.00026, and 0.08 for $k_1$ , $k_2$ , and $k_3$ , respectively. The pyrgeometer sensitivity retrieved with the new cavity is on average 1.0% higher than with the original cavity.

© 2008 Optical Society of America

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