1950
DOI: 10.6028/jres.044.041
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Permanence of glass standards of spectral transmittance

Abstract: Shortly after the introduction of cOlUmercially available photoeLectric spectrophotometers, the National Bureau of Standards began issuing calibrated disks for checking the photometric scale of spectrophotometers. At the time these standards were selected no precise information was available regarding their permanence. The present paper presents data showing that the glass s tandards kept in t he files for 16 years with only occasionaL use have not changed. Data are also given showing the nature of the changes… Show more

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Cited by 9 publications
(2 citation statements)
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“…The spectral transmittances of the four reference standards were measured on the König-Martens visual spectrophotometer [7] by using emission lines of a mercury source and a helium source and, at some wavelengths, by using an incandescent source. As explained on pages 464–465 of reference [5], it was early found advisable, because of the low luminosities of the Hg and He sources at 471.3, 491.6, 667.8, and 706.5 nm, to use the incandescent source at these wavelength settings, and this has been done in all later work on the König-Martens visual spectrophotometer. However, for the present standardization of the NBS reference standards, measurements were made with both incandescent and line sources at these four wavelengths.…”
Section: Methods Of Spectrophotometrymentioning
confidence: 99%
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“…The spectral transmittances of the four reference standards were measured on the König-Martens visual spectrophotometer [7] by using emission lines of a mercury source and a helium source and, at some wavelengths, by using an incandescent source. As explained on pages 464–465 of reference [5], it was early found advisable, because of the low luminosities of the Hg and He sources at 471.3, 491.6, 667.8, and 706.5 nm, to use the incandescent source at these wavelength settings, and this has been done in all later work on the König-Martens visual spectrophotometer. However, for the present standardization of the NBS reference standards, measurements were made with both incandescent and line sources at these four wavelengths.…”
Section: Methods Of Spectrophotometrymentioning
confidence: 99%
“…The uncertainties, U , were estimated as the huge error (4.9 times the probable error) of the mean values of transmittance. In 1950, Gibson and Belknap [5] published a study of the permanence of samples of the carbon-yellow, the copper-green, and the cobalt-blue glasses exposed under clear glass to south skylight and sunlight for periods up to three years. Expressed in terms of transmittance change Δ T , these samples were found to change but slightly, excepting only the copper-green glass below 500 nm, where there appears to be a definite solarization effect.…”
Section: Introductionmentioning
confidence: 99%