Radiometric Aspects of an Experiment to Determine the Melting/Freezing Temperature of Gold

Abstract

This paper describes a radiometric determination of the melting/freezing point of gold by measurement of the spectral radiance of a black body at that temperature. A simple optical system was used to image the black-body aperture onto a filter radiometer. The advantages and disadvantages of this approach are discussed. The techniques to characterize the optical system are described together with the assessment of uncertainties. The freezing point of gold was found to be 1 337,330 K ± 28 mK.

Development of Apparatus for Simultaneous Measurements of Raman Spectroscopy and High-Sensitivity Calorimetry

“…The filter radiometers are of a standard design [10] shown schematically in Figure 1 and consist of a windowless detector element (Hamamatsu S1337), filter, and high-precision aperture. Wedged multilayer interference filters are used in narrowband radiometers and coloured glass for broaderband devices.…”

Progress in Primary Acoustic Thermometry at NIST: 273 K to 505 K

“…Our results at the freezing points of indium T(In) and tin T(Sn) resolve this inconsistency in the range 430 K to 505 K and reduce the uncertainty of T − T 90 by a factor of two in this range. Additional evidence favoring the CVGT data of Edsinger and Schooley over that of Guildner and Edsinger comes from absolute radiometry at 690 K and higher temperatures [5,6]. Additional evidence favoring the CVGT data of Edsinger and Schooley over that of Guildner and Edsinger comes from absolute radiometry at 690 K and higher temperatures [5,6].…”

Radiometric applications of Fourier-transform spectrometers

“…In order to evaluate the potential of the technique, filter radiometers which had been previously characterized using the laser-based technique were then measured by the FT spectrometer. The filter radiometers are of a standard design [10] shown schematically in Figure 1 and consist of a windowless detector element (Hamamatsu S1337), filter, and high-precision aperture. Wedged multilayer interference filters are used in narrowband radiometers and coloured glass for broaderband devices.…”