Precision measurement of the thermodynamic temperature of an absolutely black body

Kotyuk, A. F.; Lovinskii, L. S.; Samoilov, L. N.; Sapritskii, V. I.

doi:10.1007/bf01121734

Cited by 3 publications

(2 citation statements)

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“…A method of determining the BB SCR which requires no pyrometric measurements was developed in the All-Union Research Institute for Optical and Physical Measurements [7]. That work demonstrated that for the determination of the black-body parameters it is possible to use two temperature modes: one at low temperature and the second at high temperature.…”

Section: Main Principle Of the Standardmentioning

confidence: 99%

A New Standard for the Candela in the USSR

Sapritskii¹

1987

Metrologia

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A method of constructing the standard for the newly defined luminous intensity unit, the candela, in the USSR is described. The standard is based on a non-selective radiometer/black-body (BB) combination. The temperature of the radiating cavity of the BB is obtained by measuring spectral and integral components of radiation at two different temperatures. The radiometer conversion coefficient is not measured by a substituting winding, but with the help of the BB according to the Stefan-Boltzmann law. The relative spectral sensitivity of the radiometer is modified by the function V (λ) by means of a liquid filter. The unit of luminous intensity is then transferred by the photometer to the light-intensity-measuring lamps.The standard has been metrologically certified and the (relative) uncertainty of reproduction was found to be 4 × 10-3.

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Section: Main Principle Of the Standardmentioning

confidence: 99%

A New Standard for the Candela in the USSR

Sapritskii¹

1987

Metrologia

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“…Another approach employs the ratio X of spectral radiances at a known wavelength λ 0 and the ratio Z of radiant exitances of a blackbody at temperatures T 1 and T 2 [16]. Using the Planck and Stefan-Boltzmann laws, one can write the system of nonlinear equations:…”

Section: Introductionmentioning

confidence: 99%

Alternative Methods of Blackbody Thermodynamic Temperature Measurement Above Silver Point

Prokhorov¹,

Sapritsky

Khlevnoy

et al. 2015

Int J Thermophys

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Presently, absolute radiometry is the main method of thermodynamic temperature determination above the silver point. The importance of such measurements has increased, as a large international project is underway aimed at assigning thermodynamic temperatures to high-temperature fixed points (HTFPs). All participants are using filter radiometers calibrated against an absolute cryogenic radiometer which, therefore, will be the basis of the provided thermodynamic temperatures of the fixed points. However, such a unified approach may lead to systematic errors (if any) common to all participants. There are methods, providing an alternative to absolute radiometry, which allow the determination of blackbody thermodynamic temperatures using relative measurements. Alternative methods, even if they have lower accuracy than absolute radiometry, could disclose some possible unrecognized systematic errors, or, on the contrary, could confirm the results obtained using absolute radiometry and increase confidence of the thermodynamic temperature determination. One such method, known as the method of ratios (i.e., double wavelength technique), is based on measuring the ratios of fluxes emitted by a blackbody in separate spectral ranges at two temperatures. This approach has been developed at VNIIOFI, but its realization met serious technical difficulties. Modern sensors with improved sensitivity and stability, extremely reproducible HTFP blackbodies, and significant progress in computational methods and computer performance provide a new chance to realize this approach with sufficient accuracy. Another method is based on comparing the ratio of fluxes 123 Int J Thermophys (2015) 36:252-266 253 measured at two wavelengths for a high-temperature blackbody with that measured for synchrotron radiation. This article overviews possibilities of the alternative methods for determination of blackbody thermodynamic temperatures by means of relative radiometry to attract attention of the thermometry and radiometry communities to the importance of international cooperation for realization of these methods.

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