Alternative Methods of Blackbody Thermodynamic Temperature Measurement Above Silver Point

Prokhorov, Alexander; Sapritsky, Victor I.; Khlevnoy, B. B.; Gavrilov, V. R.

doi:10.1007/s10765-014-1826-7

Cited by 7 publications

(4 citation statements)

References 23 publications

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“…The underlying principles of the new approach have been discussed in a recent publication [57], and the following conditions have to be experimentally fulfilled:…”

Section: Alternatives To Spectral-band Radiometrymentioning

confidence: 99%

“…Also, the same apertures are used for both filter radiometers, and so the aperture area does not need to be known precisely. As a consequence, a thermodynamic temperature of 3000 K is estimated to be measured with a standard uncertainty of 100 mK for filter radiometers with centre wavelengths at 400 nm and 900 nm [57], potentially improving the achievable uncertainties in comparison with absolute filter radiometry.…”

Section: Alternatives To Spectral-band Radiometrymentioning

confidence: 99%

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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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“…The underlying principles of the new approach have been discussed in a recent publication [57], and the following conditions have to be experimentally fulfilled:…”

Section: Alternatives To Spectral-band Radiometrymentioning

confidence: 99%

Section: Alternatives To Spectral-band Radiometrymentioning

confidence: 99%

Thermodynamic temperature by primary radiometry

Anhalt

Machin

2016

Phil. Trans. R. Soc. A.

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“…With three or more points so obtained, Sakuand ma-Hattori-function 8 is used for further refinement and for interpolation between the points. Thus this and an alternate approach 9 emphasize on reproducibility and traceability but do not use the Planckprofile directly, nor the dependence of emissivity on temperature and wavelength properly taken care off. Thus an approach that do not require temperature at fixed points to be preassigned a value, prescriptions for interpolation, do not collect extraneous signals (from a surface) and employs the Planck'sprofile directly, taking care of the dependence of emissivity on material phase, temperature and wavelength, is desirable for establishing the absolute temperature points and a scale.…”

Section: Introductionmentioning

confidence: 99%

Absolute temperature directly from plank’s profile: A simulation

Saivihar¹

2021

jusps-A

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The measured thermal radiation from a material surface will, in general, have a wave length (\lambda) dependent scale-factor to the Planck profile (PT) from the contributions of the emissivity (Є\lambda) of the surface, the response function (A\lambda) of the measurement setup, and the emission via non-Plank processes. For obtaining the absolute temperature from such a profile, a procedure that take care of these dependencies and which relay on a temperature grid searchis proposed. In the procedure, the deviation between the Plank profiles at various temperatures and the measured spectrum that is made equal to it at a selected wavelength, by scaling, is used. The response function (A\lambda) is eliminated at the measurement stage and the polynomial dependence of the remnant scale factor mostly dominated by Є\lambda) i s extracted from the measured spectrum by identifying its optimal \lambda dependence. It is shown that when such a computation is carried out over a temperature grid, the absolute temperature can be identified from the minimum of the above deviation. Here, search for T and Є\lambda) d elinked, unlike in the leastsquare approaches that are normally employed. Code that implements the procedure is tested with simulated Planck profile to which different viable values of Є\lambda) a nd noise is incorporated. It shown that if the \lambda dependence of scale-factor is not too high, the absolute temperature can be recovered. A large \lambda dependent scale-factor and the consequent possible error in the temperature obtained can also be identified.

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“…This article describes a new and simple technique for the determination of thermodynamic temperature of a blackbody, called 'Synthetic Double Wavelength Technique (SDWT)'. As for the double-wavelength technique (DWT) [4][5][6][7][8][9], SDWT is based on the ratio of the spectroradiometer signals of two different optical bands (a narrowband, and a broadband) at two different blackbody temperatures (T 1 and T 2 ). The advantage of the SDWT is that this technique does not require the calibration of the relative spectral responsivity of a broadband optical filter.…”

Section: Introductionmentioning

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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Alternative Methods of Blackbody Thermodynamic Temperature Measurement Above Silver Point

Cited by 7 publications

References 23 publications

Thermodynamic temperature by primary radiometry

Thermodynamic temperature by primary radiometry

Absolute temperature directly from plank’s profile: A simulation

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

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