Development of large-area high-temperature fixed-point blackbodies for photometry and radiometry

Khlevnoy, B. B.; Grigoryeva, Irina; Anhalt, K.; Waehmer, Martin; Ivashin, Evgeniy; Otryaskin, D. A.; Solodilov, M. V.; Sapritsky, Victor I.

doi:10.1088/1681-7575/aaa16a

Cited by 11 publications

(5 citation statements)

References 12 publications

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“…Our assumption is supported by the experiment described in [19], showed that the difference approximately doubled with doubling the thickness of the cavity bottom, which confirms the temperature-drop effect but not emissivity effect.…”

Section: Large-area Wc-c Blackbody Temperature Measurementsupporting

confidence: 82%

“…The previous investigation showed that thermodynamic temperature of a large-cell fixed point blackbody is a bit lower than temperature of a small-cell one [19]. We suppose this difference is due to larger temperature drop across the back cavity wall because of larger radiation loss for the large cell (the phenomenon known as 'temperature drop effect').…”

Section: Large-area Wc-c Blackbody Temperature Measurementmentioning

confidence: 87%

“…Emissivity ε eff of the 14 mm WC-C fixed point blackbody and its uncertainty was estimated based on the Monte Carlo modelling using the STEEP3 software [30]. The emissivity was estimated to be 0.9997 with the standard uncertainty varied from 0.0001 to 0.0002 [19].…”

Section: Emissivity Of the Wc-c Fixed Point Blackbodymentioning

confidence: 99%

“…The 3 mm diameter WC-C HTFP blackbodies are generally used in radiation thermometry [13,14], or in radiometry for traceability to temperature scale [15,16]. After development and investigation of small WC-C cells with cavity diameters of 3 mm and 5 mm [17,18], VNIIOFI developed a large area fixed-point cell blackbody with the cavity diameter of 14 mm [19]. The large-area cell has longer phase-transition melting plateau and relatively high radiation flux compared to a small-area HTFP cell of the same type (figure 1).…”

Section: Introductionmentioning

confidence: 99%

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Spectral irradiance scale realization and uncertainty analysis based on a 14 mm diameter WC–C fixed point blackbody from 250 nm to 2500 nm

Dai

Wang

et al. 2022

Metrologia

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Spectral irradiance scale in the wavelength range from 250 nm to 2500 nm was realized at National Institute of Metrology (NIM) on the basis of a large area tungsten carbide–carbon (WC-C) high temperature fixed point blackbody, which is composed of a 14 mm diameter WC-C fixed point cell and a variable temperature blackbody BB3500MP as a furnace. A series of 1000 W FEL tungsten halogen lamps were used as transfer standards. The new spectral irradiance scale was compared with the scale based on a variable-temperature blackbody BB3500M, and the divergence between these two methods varied from -0.66% to 0.79% from 280 nm to 2100 nm. The measurement uncertainty of spectral irradiance scale based on fixed-point blackbody was analyzed, and the expanded uncertainty was estimated as 3.9% at 250 nm, 1.4% at 280 nm, 0.43 % at 400 nm, 0.27% at 800 nm, 0.25% at 1000 nm, 0.62% at 1500 nm, 0.76% at 2000 nm, and 2.4% at 2500 nm respectively. In the range from 300 nm to 1000 nm the fixed-point scale was improved obviously: the uncertainty decreased by more than 25% compared to the uncertainty based on the variable temperature blackbody. Below 300 nm, the uncertainty became higher because the signal to noise ratio was poor. Above 1100 nm, the contribution of temperature measurement to the uncertainty of spectral irradiance decreases, therefore the uncertainties of two methods are almost at the same level. The fixed-point blackbody was also used to realize the correlated colour temperature and distribution temperature of a tungsten filament lamp, the deviation from the variable temperature blackbody method was -0.5 K and -2.9 K, respectively.

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Section: Large-area Wc-c Blackbody Temperature Measurementsupporting

confidence: 82%

Section: Large-area Wc-c Blackbody Temperature Measurementmentioning

confidence: 87%

Section: Emissivity Of the Wc-c Fixed Point Blackbodymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Spectral irradiance scale realization and uncertainty analysis based on a 14 mm diameter WC–C fixed point blackbody from 250 nm to 2500 nm

Dai

Wang

et al. 2022

Metrologia

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“…The WC-C fixed-point has a temperature higher than that of any of the HTFPs covered in the CCT HTFP research plan, and the observed plateau has a better quality in terms of shape and repeatability [5][6][7]. Its temperature is comparable with that of quartz halogen lamps widely used in radiometry, and therefore WC-C is a very convenient reference source for spectral radiance and irradiance [8]. WC-C's long-term stability [9] allows checking for drift of optical sources and detectors.…”

Section: The Wc-c Peritectic Pointmentioning

confidence: 98%

Performance of WC–C peritectic and Ru–C eutectic fixed points

Sasajima

Khlevnoy

et al. 2019

Metrologia

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Two types of high-temperature fixed points (HTFPs) were evaluated by VNIIOFI, NIM, KRISS and NMIJ. WC-C peritectic point cells manufactured independently in different National Metrology Institutes (NMIs) were compared for the first time, and agreement of the melting temperatures for three high-quality cells at the level of 0.05 °C was demonstrated. This confirms, in conjunction with previous results that verified their long-term stability, high repeatability and reproducibility, the high potential of the WC-C cell as the highesttemperature reference point for radiation thermometry.The performance of the Ru-C eutectic fixed point was verified by evaluating Ru-C cells manufactured from 99.999% purity Ru materials from different manufacturers. These cells used considerably purer materials than those used in previous studies. New Ru-C cells were constructed from the best performing materials, and the t 90 values of these cells were measured at the four NMIs on their locally-realized ITS-90 scale. The values agreed within 0.25 °C among the four NMIs, and the t 90 value of Ru-C was determined to be 1953.64 °C with an expanded uncertainty of 0.20 °C. Both results confirmed that performance of WC-C and of Ru-C is comparable to or exceeds that of the HTFPs evaluated in the Consultative Committee for Thermometry's HTFP project, and both fixed points have capability as a reference fixed points to be included in the future MeP-K in terms of thermodynamic temperature T.

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Elements of Blackbodies Design

Sapritsky

Prokhorov²

2020

Blackbody Radiometry

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Development of large-area high-temperature fixed-point blackbodies for photometry and radiometry

Cited by 11 publications

References 12 publications

Spectral irradiance scale realization and uncertainty analysis based on a 14 mm diameter WC–C fixed point blackbody from 250 nm to 2500 nm

Spectral irradiance scale realization and uncertainty analysis based on a 14 mm diameter WC–C fixed point blackbody from 250 nm to 2500 nm

Performance of WC–C peritectic and Ru–C eutectic fixed points

Elements of Blackbodies Design

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