Primary Radiometry for the mise-en-pratique: The Laser-Based Radiance Method Applied to a Pyrometer

Briaudeau, S.; Sadli, M.; Bourson, F.; Rougi, B.; Rihan, A.; Zondy, J.‐J.

doi:10.1007/s10765-011-1129-1

Cited by 15 publications

(15 citation statements)

References 16 publications

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“…Such narrow band optical detection can be considered as monochromatic in comparison to the blackbody spectral radiance (Planck's law). Thus, equations ( 5), ( 16) and ( 17) may be used to express the narrowband measurement equation (11):…”

Section: Sdwt Principle and Computation From Measurement Recordingsmentioning

confidence: 99%

The synthetic double wavelength technique: a simple robust method for thermodynamic temperature determination

et al. 2020

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This paper describes a new relative technique developed at LNE-Cnam, for the determination of the thermodynamic temperature of blackbodies without recourse to a radiometric reference. This technique is referred to as the ‘synthetic double wavelength technique’ (SDWT) as it is considered to be a particular case of the ‘double wavelength technique’ (DWT). It offers a new experimental technique for the determination of the thermodynamic temperature at high temperature and as such a new means for the mise-en-pratique of the new definition of the kelvin achievable by any national metrology institute provided a multi-wavelength radiation thermometer combining large and narrow bandwidths is available. In this work, a first experimental implementation of this technique based on a wavelength-tuneable spectroradiometer providing both narrowband and broadband signals with the particularity of the broadband signal being virtually synthesised from the spectral distribution of the narrowband signals sampled over a wide spectral range. SDWT determination of the thermodynamic temperature of a blackbody at 2760 K was performed with a level of uncertainty that confirms the promising capabilities of this technique.

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Section: Sdwt Principle and Computation From Measurement Recordingsmentioning

confidence: 99%

The synthetic double wavelength technique: a simple robust method for thermodynamic temperature determination

et al. 2020

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“…(ii) Calibration of the radiation thermometer at LNE-Cnam LNE-Cnam calibrated an LP3 radiation thermometer in terms of thermodynamic temperature using a set of HTFP cells which had been calibrated in terms of thermodynamic temperature using a dedicated absolute radiometric sprectroradiometer [28,29]. The HTFP cells used for the calibration of the LNE-Cnam LP3 radiation thermometer had the assigned thermodynamic temperatures given in table 3.…”

Section: Dissemination With Radiation Thermometers or Filter Radiometersmentioning

confidence: 99%

Dissemination of thermodynamic temperature above the freezing point of silver

Sadli¹,

Machin

Anhalt

et al. 2016

Phil. Trans. R. Soc. A.

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The mise-en-pratique for the definition of the kelvin at high temperatures will formally allow dissemination of thermodynamic temperature either directly or mediated through high-temperature fixed points (HTFPs). In this paper, these two distinct dissemination methods are evaluated, namely source-based and detector-based. This was achieved by performing two distinct dissemination trials: one based on HTFPs, the other based on absolutely calibrated radiation thermometers or filter radiometers. These trials involved six national metrology institutes in Europe in the frame of the European Metrology Research Programme joint project 'Implementing the new kelvin' (InK). The results have shown that both dissemination routes are possible, with similar standard uncertainties of 1-2 K, over the range 1273-2773 K, showing that, depending on the facilities available in the laboratory, it will soon be possible to disseminate thermodynamic temperatures above 1273 K to users by either of the two methods with uncertainties comparable to the current temperature scale.

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“…Here, instead of a narrow-band filter radiometer, a photometer with an absolutely calibrated illuminance responsivity and a colour correction, as determined by the photometry group of the National Metrology Institute of Australia (NMIA), is used to determine the blackbody temperature from the measured luminance. (iv) At the Laboratoire National de Métrologie et d'Essais (LNE, France) [42], the filter radiometer is realized not as a compact and single-wavelength device, but instead as a spectrally tuneable spectroradiometer based on a Czerny-Turner-type monochromator. This is calibrated using the radiance approach to a c-ESR, with Si photodiode trap detectors and a tuneable laser source with an integrating sphere.…”

Section: Four Radiometric Approachesmentioning

confidence: 99%

Thermodynamic temperature by primary radiometry

Anhalt

Machin

2016

Phil. Trans. R. Soc. A.

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Above the freezing temperature of silver (1234.93 K), the International Temperature Scale of 1990 (ITS-90) gives a temperature, T90, in terms of a defining fixed-point blackbody and Planck's law of thermal radiation in ratio form. Alternatively, by using Planck's law directly, thermodynamic temperature can be determined by applying radiation detectors calibrated in absolute terms for their spectral responsivity. With the advent of high-quality semiconductor photodiodes and the development of high-accuracy cryogenic radiometers during the last two decades radiometric detector standards with very small uncertainties in the range of 0.01-0.02% have been developed for direct, absolute radiation thermometry with uncertainties comparable to those for the realization of the ITS-90. This article gives an overview of a number of design variants of different types of radiometer used for primary radiometry and describes their calibration. Furthermore, details and requirements regarding the experimental procedure for obtaining low uncertainty thermodynamic temperatures with these radiometers are presented, noting that such radiometers can also be used at temperatures well below the silver point. Finally, typical results obtained by these methods are reviewed.

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Primary Radiometry for the mise-en-pratique: The Laser-Based Radiance Method Applied to a Pyrometer

Cited by 15 publications

References 16 publications

The synthetic double wavelength technique: a simple robust method for thermodynamic temperature determination

The synthetic double wavelength technique: a simple robust method for thermodynamic temperature determination

Dissemination of thermodynamic temperature above the freezing point of silver

Thermodynamic temperature by primary radiometry

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