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Downloaded From: http://proceedings.spiedigitallibrary.org/ on 06/21/2016 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx 7 MARTIN J E, FOX N P and KEY P J, 1985, Metrologia 21, 147 -155.A cryogenic radiometer for absolute radiometric measurements.A cryogenic radiometer for absolute radiometric measurements.

An intercomparison of the regular spectral transmittance scales of NIST, Gaithersburg, MD. (USA); PTB, Braunschweig (FRG); NPL, Teddington, Middlesex (UK); and OMH, Budapest (H) was accomplished using three sets of neutral glass filters with transmittances ranging from approximately 0.92 to 0.001. The difference between the results from the reference spectrophotometers of the laboratories was generally smaller than the total uncertainty of the interchange. The relative total uncertainty ranges from 0.05% to 0.75% for transmittances from 0.92 to 0.001. The sample-induced error was largecontributing 40% or more of the total except in a few cases.

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