27 research outputs found
Development of a stable ultraviolet source and techniques for accurate radiometry Status report, 1 Oct. - 31 Dec. 1965
Stable ultraviolet source and accurate radiometric technique
Development of a stable ultraviolet source and techniques for accurate radiometry annual summary report, jan. 1 - dec. 31, 1964
Argon arc stable source of high ultraviolet radiation and high accuracy spectroradiometer for calibration of spectral radiation standard
Development of a stable ultraviolet source and techniques for accurate radiometry Annual summary report, 1 Jan. - 31 Dec. 1965
Drawings and characteristics of small portable model of high pressure plasma arc source for stable accurate ultraviolet radiometr
Guidelines on the measurement of ultraviolet radiation levels in ultraviolet phototherapy:report issued by the British Association of Dermatologists and British Photodermatology Group 2015
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National Bureau of Standards Reports
Report reviewing the theoretical methods of optical pyrometry and the application of these methods at the National Bureau of Standards in realizing, maintaining and distributing the International Practical Temperature Scale above 1063 ºC is presented. In the theoretical presentation, the concepts of effective and mean effective wavelengths are introduced, and various equations relating these parameters to each other and other physical quantities are derived. The methods presentation discusses important features of precision visual optical pyrometers, experimental procedures, and results of primary and secondary calibrations of optical pyrometers
SUSPEN intercomparison of ultraviolet spectroradiometers
Results from an intercomparison campaign of ultraviolet spectroradiometers that was organized at Nea Michaniona, Greece July, 1–13 1997, are presented. Nineteen instrument systems from 15 different countries took part and provided spectra of global solar UV irradiance for two consecutive days from sunrise to sunset every half hour. No data exchange was allowed between participants in order to achieve absolutely independent results among the instruments. The data analysis procedure included the determination of wavelength shifts and the application of suitable corrections to the measured spectra, their standardization to common spectral resolution of 1 nm full width at half maximum and the application of cosine corrections. Reference spectra were calculated for each observational time, derived for a set of instruments which were objectively selected and used as comparison norms for the assessment of the relative agreement among the various instruments. With regard to the absolute irradiance measurements, the range of the deviations from the reference for all spectra was within ±20%. About half of the instruments agreed to within ±5%, while only three fell outside the ±10% agreement limit. As for the accuracy of the wave-length registration of the recorded spectra, for most of the spectroradiometers (14) the calculated wavelength shifts were smaller than 0.2 nm. The overall outcome of the campaign was very encouraging, as it was proven that the agreement among the majority of the instruments was good and comparable to the commonly accepted uncertainties of spectral UV measurements. In addition, many of the instruments provided consistent results relative to at least the previous two intercomparison campaigns, held in 1995 in Ispra, Italy and in 1993 in Garmisch-Partenkirchen, Germany. As a result of this series of intercomparison campaigns, several of the currently operating spectroradiometers operating may be regarded as a core group of instruments, which with the employment of proper operational procedures are capable of providing quality spectral solar UV measurements