Journal ArticleDOI
A Radiometric Determination of the Stefan-Boltzmann Constant and Thermodynamic Temperatures between -40 degrees C and +100 degrees C
Terence John Quinn,J E Martin +1 more
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The total radiant exitance of a black body at the temperature of the triple point of water, T$\text{tp}}$ (273.16 K), and at a series of other temperatures in the range from about 233 K (-40 degrees C) to 373 K (100 degrees C), has been measured by using a cryogenic radiometer as discussed by the authors.Abstract:
The total radiant exitance of a black body at the temperature of the triple point of water, T$\_{\text{tp}}$ (273.16 K), and at a series of other temperatures in the range from about 233 K (-40 degrees C) to 373 K (100 degrees C), has been measured by using a cryogenic radiometer. From the measurements at T$\_{\text{tp}}$ a value for the Stefan-Boltzmann constant $\sigma $ has been calculated: $\sigma $ = (5.669 67 $\pm $ 0.000 76) $\times $ 10$^{-8}$ W m$^{-2}$ K$^{-4}$. This is the first radiometric determination of $\sigma $ having an uncertainty comparable with that calculated directly from fundamental physical constants. This measured value differs from the calculated one by 13 parts in 10$^{5}$, which is less than the combined standard deviations of the measured and calculated values. From the measurements of exitance at the other temperatures, values of the corresponding thermodynamic temperature T have been calculated by using Stefan's fourth-power law. Since the temperature of the radiating black body was also measured by platinum resistance thermometers calibrated on IPTS-68, values of (T-T$\_{68}$) were obtained. These range from about -(5 $\pm $ 1.6) mK at 20 degrees C to -(28 $\pm $ 2.5) mK at 100 degrees C and +(5 $\pm $ 1.5) mK at -40 degrees C. The results confirm to within a few millikelvins the departure of T$\_{68}$ from T above 0 degrees C already discovered by gas thermometry and show that similar departures, but of opposite sign, exist down to the lowest temperature measured, -40 degrees C. The uncertainties associated with these new values of T and (T-T$_{68}$) are similar to those of the best gas thermometry.read more
Citations
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CODATA Recommended Values of the Fundamental Physical Constants: 2006
TL;DR: The 2010 self-consistent set of values of the basic constants and conversion factors of physics and chemistry recommended by the Committee on Data for Science and Technology (CODATA) for international use is presented in this article.
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The 1986 adjustment of the fundamental physical constants
E. Richard Cohen,Barry N. Taylor +1 more
TL;DR: CODATA presents here a revised version of these recommendations which takes into account the significant advances in metrology that have occurred since the 1973 analysis.
The 1986 adjustment of the fundamental physical constants: a report of the codata task group on fundamental constants
E.R. Cohen,B.N. Taylor +1 more
TL;DR: CODATA as discussed by the authors presented a revised version of these recommendations which took into account the significant advances in metrology that have occurred since the 1973 analysis, which is called the 1986 adjustment of the fundamental physical constants, which represents a 5-year effort involving experts from the major metrological laboratories of the world.
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Metrology of single-photon sources and detectors: a review
Christopher J. Chunnilall,Ivo Pietro Degiovanni,Stefan Kück,Ingmar Müller,Alastair G. Sinclair +4 more
TL;DR: In this article, a review article gives an overview of the methods, both conventional and recently developed, that are available for measuring the performance of these devices, with traceability to the SI system.
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The international temperature scale of 1990 (ITS-90)
TL;DR: The International Temperature Scale of 1990 (ITS-90) will come into force on 1st January 1990 as mentioned in this paper and the International Practical Temperature Scale (IPTS-68) will be replaced by ITS-90.
References
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TL;DR: In this article, the authors address thermodynamic temperature determinations temperature scales temperature fixed points resistance thermometry thermocouple thermometry radiation thermometry temperature control electronic thermometry calibration methods thermometry for special applications
Journal ArticleDOI
The thermal conductivity of epoxy-resin / powder composite materials
K W Garrett,H M Rosenberg +1 more
TL;DR: In this article, it was shown that above about 10 K the conductivity of the composites is in good agreement with theory for the glass spheres, whilst for non-spherical particles the addition of a shape factor in the theory improves the agreement.
Journal ArticleDOI
A Precise Measurement of the Stefan-Boltzmann Constant
W R Blevin,W J Brown +1 more
TL;DR: In this paper, the Stefan Boltzmann constant σ has been evaluated by using an absolute radiometer of the electrical substitution type to measure the radiance of a cavity radiator at the freezing-point of gold, TAu.
Journal ArticleDOI
An Acoustic Redetermination of the Gas Constant
TL;DR: In this article, Quinn et al. used a transducer used to excite their acoustic interferometer, which led to low pressure curvature in their acoustic isotherm.
Journal ArticleDOI
Diffraction Losses in Radiometry and Photometry
TL;DR: In this article, the authors reviewed from the radiometric point of view diffraction losses at circular apertures, for both the Fraunhofer and Fresnel conditions and for both monochromatic and complex radiation.