Abstract
The Optical Technology Division of NIST has developed a new instrument for measuring ISO standard visual diffuse transmission densities using the diffuse influx mode. This instrument is used to calibrate both X-ray and photographic film step tablet Standard Reference Materials. The design, characterization, and operation of the instrument are detailed. The instrument was fully characterized both to verify compliance with the applicable international standards and to determine the combined uncertainty in transmission density associated with the calibrations. Results from comparisons with other laboratories are also presented.
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