1、Designation:G13812Standard Test Method forCalibration of a Spectroradiometer Using a Standard Sourceof Irradiance1This standard is issued under the fixed designation G138;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of la
2、st revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.INTRODUCTIONA standardized means of performing and reporting calibration of the spectroradiometer for spectralirradiance measurements is
3、 desirable.This test method presents specific technical requirements for a laboratory performing calibration ofa spectroradiometer for spectral irradiance measurements.A detailed procedure for performing thecalibration and reporting the results is outlined.This test method for calibration is applica
4、ble to spectroradiometric systems consisting of at least amonochromator,input optics,and an optical radiation detector,and applies to spectroradiometriccalibrations performed with a standard of spectral irradiance with known irradiance values traceableto a national metrological laboratory that has p
5、articipated in intercomparisons of standards of spectralirradiance.The standard must also have known uncertainties and measurement geometry associatedwith its irradiance values.1.Scope1.1 This test method covers the calibration of spectroradi-ometers for the measurement of spectral irradiance using
6、astandard of spectral irradiance that is traceable to a nationalmetrological laboratory that has participated in intercompari-sons of standards of spectral irradiance.1.2 This method is not limited by the input optics of thespectroradiometric system.However,choice of input opticsaffects the overall
7、uncertainty of the calibration.1.3 This method is not limited by the type of monochroma-tor or optical detector used in the spectroradiometer system.Parts of the method may not apply to determine which partsapply to the specific spectroradiometer being used.It isimportant that the choice of monochro
8、mator and detector beappropriate for the wavelength range of interest for thecalibration.Though the method generally applies to photo-diode array detector based systems,the user should note thatthese types of spectroradiometers often suffer from stray lightproblems and have limited dynamic range.Dio
9、de array spec-troradiometers are not recommended for use in the ultravioletrange unless these specific problems are addressed.1.4 The calibration described in this method employs theuse of a standard of spectral irradiance.The standard ofspectral irradiance must have known spectral irradiance values
10、at given wavelengths for a specific input current and clearlydefined measurement geometry.Uncertainties must also beknown for the spectral irradiance values.The values assignedto this standard must be traceable to a national metrologicallaboratory that has participated in intercomparisons of stan-da
11、rds of spectral irradiance.These standards may be obtainedfrom a number of national standards laboratories and commer-cial laboratories.The spectral irradiance standards consistmainly of tungsten halogen lamps with coiled filaments en-closed in a quartz envelope,though other types of lamps areused.S
12、tandards can be obtained with calibration values cov-ering all or part of the wavelength range from 200 to 4500 nm.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 approve
13、d June 1,2012.Published July 2006.Originally approvedin 1996.Last previous edition approved in 2003 as G138 03.DOI:10.1520/G0138-06.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 thesa
14、fety 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.22.Referenced Documents2.1 ASTM Standards:3E772 Terminology of Solar Energy
15、ConversionE1341 Practice for Obtaining Spectroradiometric Data fromRadiant Sources for Colorimetry2.2 Other Documents:CIE Publication No.634The Spectrodiometric Measurementof Light SourcesNIST Technical Note 1927:Guidelines for Evaluation andExpressing Uncertainty of NIST Measurement Results53.Termi
16、nology3.1 General terms pertaining to optical radiation and opti-cal measurement systems are defined in Terminology.Some ofthe more important terms from that standard used in this paperare listed here.3.1.1 bandwidth,nthe extent of a band of radiationreported as the difference between the two wavelengths atwhich the amount of radiation is half of its maximum over thegiven band.3.1.2 diffuser,na device used to scatter or disperse lightusually through the process of diffuse transmission or reflec-