ASTM_G_130_-_12.pdf

Designation:G13012Standard Test Method forCalibration of Narrow-and Broad-Band UltravioletRadiometers Using a Spectroradiometer1This standard is issued under the fixed designation G130;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.INTRODUCTIONAccurate and precise measurements of ultraviolet irradiance are required in the determination of theradiant exposure of both total and selected narrow bands of ultraviolet radiation for the determinationof exposure levels in(1)outdoor weathering of materials,(2)indoor accelerated exposure testing ofmaterials using manufactured light sources,and(3)UV-Aand UV-B ultraviolet radiation in terms bothof the assessment of climatic parameters and the changes that may be taking place in the solarultraviolet radiation reaching earth.Although meteorological measurements usually require calibration of pyranometers and radiom-eters oriented with axis vertical,applications associated with materials testing require an assessmentof the calibration accuracy at orientations with the axis horizontal(usually associated with testing inindoor exposure cabinets)or with the axis at angles typically up to 45 or greater from the horizontal(for outdoor exposure testing).These calibrations also require that deviations from the cosine law,tilteffects,and temperature sensitivity be either known and documented for the instrument model ordetermined on individual instruments.This test method requires calibrations traceable to primary reference standards maintained by anational metrological laboratory that has participated in intercomparisons of standards of spectralirradiance.1.Scope1.1 This test method covers the calibration of ultravioletlight-measuring radiometers possessing either narrow-orbroad-band spectral response distributions using either a scan-ning or a linear-diode-array spectroradiometer as the primaryreference instrument.For transfer of calibration from radiom-eters calibrated by this test method to other instruments,TestMethod E824 should be used.NOTE1Special precautions must be taken when a diode-arrayspectroradiometer is employed in the calibration of filter radiometershaving spectral response distributions below 320-nm wavelength.Suchprecautions are described in detail in subsequent sections of this testmethod.1.2 This test method is limited to calibrations of radiometersagainst light sources that the radiometers will be used tomeasure during field use.NOTE2For example,an ultraviolet radiometer calibrated againstnatural sunlight cannot be employed to measure the total ultravioletirradiance of a fluorescent ultraviolet lamp.1.3 Calibrations performed using this test method may beagainst natural sunlight,Xenon-arc burners,metal halideburners,tungsten and tungsten-halogen lamps,fluorescentlamps,etc.1.4 Radiometers that may be calibrated by this test methodincludenarrow-,broad-,andwide-bandultravioletradiometers,and narrow-,broad,and wide-band visible-region-only radiometers,or radiometers having wavelengthresponse distributions that fall into both the ultraviolet andvisible regions.NOTE3For purposes of this test method,narrow-band radiometers arethose with 20 nm,broad-band radiometers are those with 20 nm 70 nm,and wide-band radiometers are those with 70 nm.NOTE4For purposes of this test method,the ultraviolet region isdefined as the region from 285 to 400-nm wavelength,and the visibleregion is defined as the region from 400 to 750-nm wavelength.Theultraviolet region is further defined as being either UV-Awith radiation ofwavelengths from 315 to 400 nm,or UV-B with radiation from 285 to315-nm wavelength.1This test method is under the jurisdiction of ASTM Committee G03 onWeathering and Durabilityand is the direct responsibility of Subcommittee G03.09on Radiometry.Current edition approved June 1,2012.Published January 2013.Originallyapproved in 1995.Last previous edition approved in 2006 as G13006 DOI:10.1520/G0130-12.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 1.5 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2E772 Terminology of Solar Energy ConversionE824 Test Method for Transfer of Calibration From Refer-ence to Field RadiometersE973 Test Method for Determination of the Spectral Mis-match Parameter Between a Photovoltaic Device and aPhotovoltaic Reference CellG138 Test Method for Calibration of a SpectroradiometerUsing a Standard Source of Irradiance2.2 Other Documents:CIE Publication No.63 The Spec-trodiometr