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United Kingdom, NPL (National Physical Laboratory)
Complete CMCs in Photometry and Radiometry for United Kingdom (.PDF file)
Transmittance, regular, spectral. Spectrally-neutral material, 1E-03 to 1
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 2.7E-05 to 1.6E-03, varies as the logarithm of the measurand
Reference spectrophotometer
Wavelength: 200 nm to 209 nm
Bandwidth: < 3 nm
 
Transmittance, regular, spectral. Spectrally-neutral material, 1E-03 to 1
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 4E-05 to 6E-04, varies as the logarithm of the measurand
Reference spectrophotometer
Wavelength: 210 nm to 219 nm
Bandwidth: < 3 nm
 
Transmittance, regular, spectral. Spectrally-neutral material, 1E-03 to 1
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 3E-05 to 4E-04, varies as the logarithm of the measurand
Reference spectrophotometer
Wavelength: 220 nm to 249 nm
Bandwidth: < 3 nm
 
Emittance, spectral. General material, 0 to 1
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 0.003 to 0.001, varies with wavenumber
Spectrophotometer with reflectometer
Wavelength range: 4000 cm-1 to 180 cm-1
Bandwidth: 2 cm-1 to 10 cm-1
Specific measurement conditions: regular reflectometer
Regular reflectance measurements
Approved on 07 May 2007
 
Emittance, spectral. General material, 0 to 1
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 0.04 to 0.004, varies with wavenumber
Spectrophotometer with reflectometer
Wavelength range: 4000 cm-1 to 180 cm-1
Bandwidth: 2 cm-1 to 10 cm-1
Specific measurement conditions: hemispherical reflectometer
 
BRDF. General material, 0.0008 sr-1 to 1000 sr-1
Absolute expanded uncertainty (k = 2, level of confidence 95 %): (0.00003 + 0.0034R)
Reference reflectometer
Wavelength range: 350 nm to 400 nm
Bandwidth: 10 nm to 20 nm
Uncertainty values are for 0/45 geometry and white Spectralon. Uncertainty varies with scattering geometry and angular dependence of scattering properties of material
Approved on 07 May 2007
 
BRDF. General material, 0.0003 sr-1 to 1000 sr-1
Absolute expanded uncertainty (k = 2, level of confidence 95 %): (0.00003 + 0.0019R)
Reference reflectometer
Wavelength range: 400 nm to 1000 nm
Bandwidth: 10 nm to 20 nm
Uncertainty values are for 0/45 geometry and white Spectralon. Uncertainty varies with scattering geometry and angular dependence of scattering properties of material
Approved on 07 May 2007
 
Reflectance factor. General material, 0.25 % to 300000 %
Absolute expanded uncertainty (k = 2, level of confidence 95 %): (0.01% + 0.0034R)
Reference reflectometer
Wavelength range: 350 nm to 400 nm
Bandwidth: 10 nm to 20 nm
Uncertainty values are for 0/45 geometry and white Spectralon. Uncertainty varies with scattering geometry and angular dependence of scattering properties of material
Approved on 07 May 2007
 
Reflectance factor. General material, 0.1 % to 300000 %
Absolute expanded uncertainty (k = 2, level of confidence 95 %): (0.01% + 0.0019R)
Reference reflectometer
Wavelength range: 400 nm to 1000 nm
Bandwidth: 10 nm to 20 nm
Uncertainty values are for 0/45 geometry and white Spectralon. Uncertainty varies with scattering geometry and angular dependence of scattering properties of material
Approved on 07 May 2007
 
Radiance factor. General material, 0.25 % to 300000 %
Absolute expanded uncertainty (k = 2, level of confidence 95 %): (0.01% + 0.0034R)
Reference reflectometer
Wavelength range: 350 nm to 400 nm
Bandwidth: 10 nm to 20 nm
Uncertainty values are for 0/45 geometry and white Spectralon. Uncertainty varies with scattering geometry and angular dependence of scattering properties of material
Approved on 07 May 2007
 
Radiance factor. General material, 0.1 % to 300000 %
Absolute expanded uncertainty (k = 2, level of confidence 95 %): (0.01% + 0.0019R)
Reference reflectometer
Wavelength range: 400 nm to 1000 nm
Bandwidth: 10 nm to 20 nm
Uncertainty values are for 0/45 geometry and white Spectralon. Uncertainty varies with scattering geometry and angular dependence of scattering properties of material
Approved on 07 May 2007
 
Wavelength. Spectrally-selective transmitting material, 200 nm to 2500 nm
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in nm: 0.1
Scanning spectrophotometer
Wavelength range: 200 nm to 2500 nm
Bandwidth: 0.1 nm to 5 nm
Approved on 07 May 2007
 
Wavenumber. Spectrally-selective transmitting material, 1028 cm-1 to 3060 cm-1
Absolute expanded uncertainty (k = 2, level of confidence 95%) in cm-1: 0.2 to 0.3 (depending on wavenumber)
Scanning spectrophotometer
Wavenumber values: 3060 cm-1, 2850 cm-1, 1943 cm-1, 1601 cm-1, 1583 cm-1, 1154 cm-1, 1028 cm-1
Bandwidth: 2 cm-1 to 10 cm-1
Approved on 07 May 2007
 
Colour, surface, x, y, Y. General material, x, y = 0 to x, y = 0.9
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 0.0002
Integrating sphere spectrophotometer
Specific measurement conditions: 0/d, 2 nm bandwidth
Type of material: non-fluorescent
Approved on 07 May 2007
 
Colour, surface, x, y, Y. General material, Y = 0 to Y = 1
Absolute expanded uncertainty (k = 2, level of confidence 95 %): (0.0005 + 0.0035Y)
Integrating sphere spectrophotometer
Specific measurement conditions: 0/d, 2 nm bandwidth
Type of material: non-fluorescent
Approved on 07 May 2007
 
Colour, surface, x, y, Y. Fluorescent material, x, y = 0 to x, y = 0.9
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 0.003
Reference spectrofluorimeter
Type of source used: monochromator
Specific measurement conditions: 0/45
Type of fluorescent material: general
Approved on 07 May 2007
 
Colour, surface, x, y, Y. Fluorescent material, Y = 0 to Y = 300
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 0.003
Reference spectrofluorimeter
Type of source used: monochromator
Specific measurement conditions: 0/45
Type of fluorescent material: general
Approved on 07 May 2007
 
Colour, surface, x, y, Y. Diffusely reflecting material, x, y = 0 to x, y = 0.9
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 0.0002
Integrating sphere spectrophotometer
Specific measurement conditions: 0/d, 2 nm bandwidth
Other types of material can also be calibrated
Approved on 07 May 2007
 
Colour, surface, x, y, Y. Diffusely reflecting material, Y = 0 to Y = 1
Absolute expanded uncertainty (k = 2, level of confidence 95 %): (0.0005 + 0.0035Y)
Integrating sphere spectrophotometer
Specific measurement conditions: 0/d, 2 nm bandwidth
Other types of material can also be calibrated
Approved on 07 May 2007
 
Colour, surface, L*a*b*. General material, L* = 0 to L* = 100
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 0.15
Integrating sphere spectrophotometer
Specific measurement conditions: 0/d, 2 nm bandwidth
Type of material: non-fluorescent
Approved on 07 May 2007