First results of measurements with the BIPM cryogenic radiometer and comparison with the INM cryogenic radiometer

hler, R K; Goebel, R; Pello, R; Touayar, O.; Bastié, Jean

doi:10.1088/0026-1394/32/6/30

Cited by 27 publications

(24 citation statements)

References 4 publications

(4 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The development of alternate traceability routes with comparable uncertainty levels and ideally linked to fundamental constants, will enable more robust independent comparisons and ensure the long-term integrity of the radiometric SI scales and disseminated units. Several comparisons of this nature have already been carried out, at least to uncertainty levels around 0.02%, confirming the underlying principle of cryogenic radiometry [48,[84][85][86][87][88][89][90]. The PS radiometer of NPL was compared with the QM radiometer, which effectively linked optical radiometric quantities and, in particular the candela, to the Stefan-Boltzman constant [48].…”

Section:  the Beam Then Illuminates A Detector Under Testmentioning

confidence: 63%

Metrology of photoluminescent materials

Zwinkels¹

2010

Metrologia

View full text Add to dashboard Cite

This paper reviews the basic concepts, metrological requirements and approaches for the precise and accurate measurement of photoluminescent materials. These fluorescence measurements offer significant advantages in terms of sensitivity and selectivity, finding wide use in a range of applications in bioanalytical, analytical chemistry and colour technology. Depending upon the specific metrological requirement, different properties of the photoluminescent material are of interest and different measurement techniques and instrumentation have been developed. The optical properties of interest for both analytical and colorimetric applications are defined along with their basic measurement principles. However, many problems are associated with the comparability of these measurements due to their dependence on both instrument and sample parameters. These considerations and measurement problems are identified and the impacts of standardization methods are illustrated in two typical applications. The paper also gives a detailed description of both the physical transfer standard and chemical transfer standard approaches for obtaining reliable, traceable fluorescence data. However, for many applications, the robust standardization of these measurements and availability of appropriate transfer standards are still in their infancy. This paper concludes with a brief discussion of the state-of-the-art uncertainties in the metrology of photoluminescence.

show abstract

Section:  the Beam Then Illuminates A Detector Under Testmentioning

confidence: 63%

Metrology of photoluminescent materials

Zwinkels¹

2010

Metrologia

View full text Add to dashboard Cite

show abstract

“…The development of alternate traceability routes with comparable uncertainty levels and ideally linked to fundamental constants, will enable more robust independent comparisons and ensure the long-term integrity of the radiometric SI scales and disseminated units. Several comparisons of this nature have already been carried out, at least to uncertainty levels around 0.02%, confirming the u nderlying principle of cryogenic radiometry [48,[84][85][86][87][88][89][90]. T he PS radiometer of NPL was compared with the QM radiometer, which effectively linked optical radiometric quantities and, in particular the candela, to the Stefan-Boltzman constant [48].…”

Section:  the Beam Then Illuminates A Detector Under Testmentioning

confidence: 66%

A systematic neutron reflectometry study on hydrogen absorption in thin Mg_1-_xAl_x alloy films Special issue on Neutron Scattering in Canada.

et al. 2010

View full text Add to dashboard Cite

Access and use of this website and the material on it are subject to the Terms and Conditions set forth at A systematic neutron reflectometry study on hydrogen absorption in thin Mg1-xAlx alloy films Fritzsche, H.; Poirier, E.; Haagsma, J.; Ophus, C.; Luber, E.; Harrower, C. T.; Mitlin, D.http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=fr L'accès à ce site Web et l'utilisation de son contenu sont assujettis aux conditions présentées dans le site LISEZ CES CONDITIONS ATTENTIVEMENT AVANT D'UTILISER CE SITE WEB. NRC Publications Record / Notice d'Archives des publications de CNRC:http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=rtdoc&an=16959085&lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=rtdoc&an=16959085&lang=fr READ THESE TERMS AND CONDITIONS CAREFULLY BEFORE USING THIS WEBSITE.http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en Vous avez des questions? Nous pouvons vous aider. Pour communiquer directement avec un auteur, consultez la première page de la revue dans laquelle son article a été publié afin de trouver ses coordonnées. Si vous n'arrivez pas à les repérer, communiquez avec nous à PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. Questions?Contact the NRC Publications Archive team at PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. If you wish to email the authors directly, please see the first page of the publication for their contact information. NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://doi.org/10.1139/P09-085Canadian Journal of Physics, 88, p. 723-728, 2010-09-01 Photometry, radiometry and "the candela": evolution are being considered now in terms of fundamental constants to provide a more universally realizable quantum-based SI system. This paper also introduces for the first time a fundamental constant for photometry.

show abstract

“…Hence, they became national primary standards for radiant power. The operation at liquid helium temperature reduces non-equivalence errors between electrical and radiative heating by increasing the receiver's thermal conductivity and eliminating heater lead losses through the use of a superconducting wire [ 2 , 3 ]. The low specific heat of cooled copper enables construction of geometrical ‘closed’ black body cavity with high absorption and without thermal constant rise.…”

Section: Reviewmentioning

confidence: 99%

Study and characterization of porous copper oxide produced by electrochemical anodization for radiometric heat absorber

et al. 2014

View full text Add to dashboard Cite

The aim of this work is to optimize the different parameters for realization of an absorbing cavity to measure the incident absolute laser energy. Electrochemical oxidation is the background process that allowed the copper blackening. A study of the blackened surface quality was undertaken using atomic force microscopy (AFM) analysis and ultraviolet-visible-infrared spectrophotometry using a Shimadzu spectrophotometer. A two-dimensional and three-dimensional visualization by AFM of the formed oxide coating showed that the copper surfaces became porous after electrochemical etching with different roughness. This aspect is becoming more and more important with decreasing current density anodization. In a 2 mol L -1 of NaOH solution, at a temperature of 90°C, and using a 16 mA cm2 constant density current, the copper oxide formed has a reflectivity of around 3% in the spectral range between 300 and 1,800 nm. Using the ‘mirage effect’ technique, the obtained Cu2O diffusivity and thermal conductivity are respectively equal to (11.5 ± 0.5) 10 to 7 m2 s-1 and (370 ± 20) Wm-1 K-1. This allows us to consider that our Cu2O coating is a good thermal conductor. The results of the optical and thermal studies dictate the choice of the cavity design. The absorbing cavity is a hollow cylinder machined to its base at an angle of 30°. If the included angle of the plane is 30° and the interior surface gives specular reflection, an incoming ray parallel to the axis will undergo five reflections before exit. So the absorption of the surface becomes closely near 0.999999.

show abstract

First results of measurements with the BIPM cryogenic radiometer and comparison with the INM cryogenic radiometer

Cited by 27 publications

References 4 publications

Metrology of photoluminescent materials

Metrology of photoluminescent materials

A systematic neutron reflectometry study on hydrogen absorption in thin Mg_1-_xAl_x alloy films Special issue on Neutron Scattering in Canada.

Study and characterization of porous copper oxide produced by electrochemical anodization for radiometric heat absorber

Contact Info

Product

Resources

About

First results of measurements with the BIPM cryogenic radiometer and comparison with the INM cryogenic radiometer

Cited by 27 publications

References 4 publications

Metrology of photoluminescent materials

Metrology of photoluminescent materials

A systematic neutron reflectometry study on hydrogen absorption in thin Mg1-xAlx alloy films Special issue on Neutron Scattering in Canada.

Study and characterization of porous copper oxide produced by electrochemical anodization for radiometric heat absorber

Contact Info

Product

Resources

About

A systematic neutron reflectometry study on hydrogen absorption in thin Mg_1-_xAl_x alloy films Special issue on Neutron Scattering in Canada.