NIST-PTB measurements of the radiometric temperatures of a high-temperature black body using filter radiometers

Yoon, Howard W.; Sperfeld, Peter; Yousef, S Galal; Metzdorf, J.

doi:10.1088/0026-1394/37/5/7

Cited by 11 publications

(10 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In these methods, the spectral radiance of a blackbody source is either measured directly, or it is calculated from the spectral irradiance measured at a known distance from the source. Several intercomparisons have shown improvement of the agreement among different national metrology institutes in the temperature range between 1,570 and 3,270 K [5][6][7]. In our previous study, the freezing temperature of a copper fixed-point cell was measured at three different wavelengths and found to be in good agreement with ITS-90 [8].…”

Section: Introductionmentioning

confidence: 87%

Filter Radiometers as a Tool for Quality Assurance of Temperature Measurements with Linear Pyrometers

Ojanen¹,

Ahtee

Noorma

et al. 2008

Int J Thermophys

View full text Add to dashboard Cite

Measurements made with a pyrometer are vulnerable to errors if the pyrometer is misaligned, inaccurately characterized, or malfunctioning. In this work, thermodynamic temperatures between 1,373 and 1,773 K were studied by measuring a variable-temperature blackbody with a linear pyrometer and four absolutely characterized filter radiometers. The filter radiometer measurements were done in the irradiance mode. In the first set of measurements, there was a 3-5 K difference between the pyrometer and the filter radiometer data. The cause was tracked to malfunctioning of the pyrometer, which was afterwards sent for repair on the basis of these results. In the second set of measurements, with the repaired pyrometer, the agreement of the temperature results was good, the mean difference being −0.41 K with a standard deviation of 0.52 K. The differences between the pyrometer and the filter radiometer temperature measurement results showed no temperature dependence. It was concluded that the filter radiometers used in the irradiance mode provided a straightforward method for the quality assurance of pyrometers.

show abstract

Section: Introductionmentioning

confidence: 87%

Filter Radiometers as a Tool for Quality Assurance of Temperature Measurements with Linear Pyrometers

Ojanen¹,

Ahtee

Noorma

et al. 2008

Int J Thermophys

View full text Add to dashboard Cite

show abstract

“…The EKO MS-711 spectroradiometer was factory calibrated by EKO Instruments making use of a calibrated transfer standard 1000 W quartz tungsten-halogen coiled-coil filament lamp that is traceable to the National Institute of Standards and Technology (NIST) standard (Yoon et al, 2000). The instrument resultant uncertainty is ± 17% for the UV range, and < 5% for the VIS 110 range.…”

Section: Spectral Langley Calibrationmentioning

confidence: 99%

Characterization of an EKO MS-711 spectroradiometer: aerosol retrieval from spectral direct irradiance measurements and corrections of the circumsolar radiation

García-Cabrera¹,

Cuevas-Agulló²,

Barreto³

et al. 2019

Preprint

View full text Add to dashboard Cite

Abstract. Spectral direct UV-Visible normal solar irradiance (DNI) measured with an EKO MS-711 spectroradiometer at the Izaña Atmospheric Observatory (IZO, Spain) has been used to determine aerosol optical depth (AOD) at several wavelengths (340, 380, 440, 500, 675 and 870 nm) between April and September 2019 that have been compared with synchronous AOD measurements from a reference Cimel-AERONET (Aerosol RObotic NETwork) sunphotometer. The EKO MS-711 has been calibrated at Izaña Observatory using the Langley-Plot method during the study period. Although this instrument has been designed for spectral solar DNI measurements, and therefore has a field of view (FOV) of 5° that is twice that recommended in solar photometry for AOD determination, the AOD differences compared against the AERONET Cimel reference instrument (FOV ∼ 1.2°), are fairly small. The comparison results between AOD Cimel and EKO MS-711 present a root mean square (RMS) of 0.013 (24.6 %) at 340, and 380 nm, and 0.029 (19.5 %) for longer wavelengths (440, 500, 675 and 870 nm). However, under relatively high AOD, near forward aerosol scattering might be significant because of the relatively large circumsolar radiation (CSR) due to the large EKO MS-711 FOV, resulting in a small but significant AOD underestimation in the UV range. The AOD differences decrease considerably when CSR corrections, estimated from LibRadtran radiative transfer model simulations, are performed, obtaining RMS of 0.006 (14.9 %) at 340 and 380 nm, and 0.005 (11.1 %) for longer wavelengths. The percentage of 2-minute synchronous EKO AOD–Cimel AOD differences within the World Meteorological Organization (WMO) traceability limits were ≥ 96 % at 500 nm, 675 nm and 870 nm with no CSR corrections. After applying the CSR corrections, the percentage of AOD differences within the WMO traceability limits increased to > 95 % for 380, 440, 500, 675 and 870 nm, while for 340 nm the percentage of AOD differences showed a poorer increase from 67 % to a modest 86 %.

show abstract

“…And at PTB a comparison based on the filter radiometer was performed in the field of absolute spectral-band radiometry and thermodynamic temperature measurement. Due to the often complex measurement set-ups and the involved sensitive detectors for a thermodynamic temperature measurement by absolute radiometry only few direct comparisons between NMI´s have been reported in the past [6,7] .…”

Section: A Comparison Of Irradiance Responsivity and Thermodynamic Tementioning

confidence: 99%

A comparison of irradiance responsivity and thermodynamic temperature measurement between PTB and NIM

Anhalt

Taubert

et al. 2013

AIP Conference Proceedings

View full text Add to dashboard Cite

show abstract

NIST-PTB measurements of the radiometric temperatures of a high-temperature black body using filter radiometers

Cited by 11 publications

References 8 publications

Filter Radiometers as a Tool for Quality Assurance of Temperature Measurements with Linear Pyrometers

Filter Radiometers as a Tool for Quality Assurance of Temperature Measurements with Linear Pyrometers

Characterization of an EKO MS-711 spectroradiometer: aerosol retrieval from spectral direct irradiance measurements and corrections of the circumsolar radiation

A comparison of irradiance responsivity and thermodynamic temperature measurement between PTB and NIM

Contact Info

Product

Resources

About