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TitleTemperature and temporal dependence of neutral density transmittance standards
Publication TypeJournal Article
Year of Publication2012
AuthorsKoo, A., and Hamlin J.D.
PaginationS68 - S72
Date Published2012
ISSN00261394 (ISSN)
KeywordsEngineering, Manufacture, Metallurgical engineering, Neutral densities, Spectral transmittance, temperature dependence, Temporal dependence
AbstractThe Schott series of NG glasses are frequently used to manufacture neutral density transmittance standards for validation of spectrophotometer systems as well as for comparisons of regular spectral transmittance scales. A study has been made of the temperature and temporal dependence of transmittance in these types of filters. The temperature dependence of transmittance is found to scale as -ln(T). The filter transmittance was found to vary significantly with time shortly after manufacture but appears to be stabilizing nine months after beginning measurements. © 2012 BIPM & IOP Publishing Ltd.

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