Journal ArticleDOI
Measurement of the Difference between IPTS-68 and Thermodynamic Temperature in the Range 457 °C to 630 °C
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In this article, the difference between the International Practical Temperature Scale (IPTS-68) and thermodynamic temperature in the range 457 °C-630 °C using the NPL photon-counting pyrometer was measured.Abstract:
This paper describes the measurement of the difference between the International Practical Temperature Scale (IPTS-68) and thermodynamic temperature in the range 457 °C-630 °C using the NPL photon-counting pyrometer. This instrument operates at sufficiently low radiance temperatures to allow the gas thermometry results of Guildner and Edsinger, which cover the range from 0 °C to 457 °C, to be extended upwards. The results agree well with the recent measurements of Jung (1984). Their implications with respect to the differences at still higher temperatures are discussed briefly.read more
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Journal ArticleDOI
Thermodynamic Basis of the ITS-90
TL;DR: The International Temperature Scale of 1990, ITS-90, came into effect on 1 January 1990, replacing the International Practical Temperature Scale (IPTS-68) and the "Echelle Provisoire de Temperature de 1976 entre 0,5 K and 30 K", EPT-76 as mentioned in this paper.
Journal ArticleDOI
Differences between Thermodynamic Temperature and t (IPTS-68) in the Range 230°C to 660°C
R E Edsinger,J F Schooley +1 more
TL;DR: In this article, the difference between the Kelvin Thermodynamic Temperature Scale (KTTS) and the International Practical Temperature Scale of 1968 (IPTS-68) in the range from 230°C to 660°C has been determined by gas thermometry.
Journal ArticleDOI
A Measurement of Thermodynamic Temperatures Between 683 K and 933 K by an Infrared Pyrometer
TL;DR: In this paper, a pyrometric method and appropriate black bodies are described for the accurate measurement of thermodynamic temperature above 683 K (410 °C) using unbiased low-noise silicon detectors of linear response and a dielectric multi-cavity interference filter of 40 nm halfwidth with a sharply-edged band pass.
Journal ArticleDOI
Determination of the Departure of the International Practical Temperature Scale of 1968 from Thermodynamic Temperature in the Region between 693 K and 904 K
J Bonhoure,R Pello +1 more
TL;DR: In this paper, the difference between international practical temperature and thermodynamic temperature has been measured in the range from 693 K to 904 K using a pyrometric method and the difference is expressed by: T - T68 = -0.2749 × 10-3 T + 0.1235 K.
Journal ArticleDOI
Direct Measurement of the Discontinuity in dt/dt68 at 630.74°C in the IPTS-68
TL;DR: In this article, the authors measured the magnitude of the discontinuity in IPTS-68 at 6.74°C and found that it is 0.51 ± 0.10 percent.
References
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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
Deviation of International Practical Temperatures from Thermodynamic Temperatures in the Temperature Range from 273.16 K to 730 K.
L. A. Guildner,R.E. Edsinger +1 more
TL;DR: In this article, the range over which thermodynamic temperatures have been realized by gas thermometry at the NBS has been extended to 730 K, and the results are preserved by measuring the corresponding international practical temperatures.
Journal ArticleDOI
A precise determination of the freezing point of copper
P B Coates,J W Andrews +1 more
TL;DR: In this paper, the freezing point of copper ingots was determined using the NPL photon-counting pyrometer, using measurements made on two high-purity ingots at four wavelengths from 660 nm to 812 nm.
Journal ArticleDOI
An Intercomparison of High Temperature Platinum Resistance Thermometers and Standard Thermocouples
J P Evans,S D Wood +1 more
TL;DR: In this article, the authors compared nine high temperature platinum resistance thermometers and eight standard thermocouples at 50 degree intervals over the range 630.74 to 1064.43 °C.
Journal ArticleDOI
Détermination radiométrique des températures thermodynamiques comprises entre 904 et 1338 K
TL;DR: In this article, the freezing points of gold and silver were determined using a monochromatic optical pyrometric method based on Planck's radiation law, taking c2 = 0.014388 m. The results obtained for Ag (1235.16 K ± 0.13 K) and Au (1337.53 K ± 1.16 k) were in good agreement with the IPTS-68 (12 35.08 K and 1337.58 K), but the scale of the standard thermocouple was not satisfactory between 904 K and 1235
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Deviation of International Practical Temperatures from Thermodynamic Temperatures in the Temperature Range from 273.16 K to 730 K.
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