Current and Future Realizations NRC Photometric and Spectroradiometric Calibration Chains

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1 Measurement Science and Standards (MSS) Current and Future Realizations NRC Photometric and Spectroradiometric Calibration Chains Arnold A. Gaertner Photometry, Radiometry and Thermometry (PRT) CORM 30 May 2012 NRC, 100 Sussex Drive, Ottawa

2 Photometry and Spectroradiometry Outline Calibration and measurement services Present calibration chain Future calibration chain SSL facility

3 Photometry and Spectroradiometry Measurement Geometries - 4 basic optical radiation measurement configurations total flux illuminance / irradiance luminance / radiance intensity total flux intensity luminance radiance illuminance irradiance

4 Calibration services Photometry of Incandescent Lamps - total luminous flux (lumen standards) - luminous intensity standards - illuminance standards Required Working Standards Total luminous flux lamp Luminous intensity lamp Calibration of Photometric Instruments and Sources - illuminance meters - luminance meters - luminance sources Spectroradiometry - spectral irradiance lamp standards - spectral radiance source standards - spectroradiometers - irradiance - radiance + Diffuse reflectance standard Spectral irradiance lamp + Diffuse reflectance standard Spectral irradiance lamp + Diffuse reflectance standard

5 Working standard lamps Total luminous flux Luminous intensity Spectral irradiance Auxiliary standards Diffuse reflectance standard

6 Primary calibration Measurement of absolute amount of optical radiation power - SI units (watt) - absolute radiometer Room Temperature ESR Cryogenic Radiometer

7 Photometric calibration chain (present) Luminous Intensity: Absolute Radiometer (room temperature) SI CIE Secondary Radiometers (Si photodiodes) V(l)-correcting filter LIS lamp Luminous Intensity Standard NRC candela maintained on lamps 0.5%

8 Photometric calibration chain (present) Total Luminous Flux: Absolute Radiometer (room temperature) Secondary Radiometers (Si photodiodes) V(l)-correcting filter NRC lumen maintained on lamps 1.0% LIS lamp Goniophotometer 0.5%

9 Spectroradiometric calibration chain Spectral Irradiance (present): Absolute Radiometer (room temperature) narrow-band filter detector based FEL lamp NRC spectral irradiance maintained on lamps (FEL)

10 Spectroradiometric calibration chain Spectral Irradiance (present): NIST NRC Absolute Radiometer NIST FEL 1000W incandescent quartz-halogen NRC CIE NRC spectral irradiance maintained on lamps (FEL)

11 International Comparisons (CCPR) k=2 CCPR = Consultative Committee for Photometry and Radiometry

12 Optical radiation calibration chain Present: detector - based Absolute Radiometer (room temperature) Secondary Radiometers (Si photodiodes) V(l)-correcting filter narrow-band filter LFS lamp gonio photometer LIS lamp FEL lamp NIST

13 Optical radiation calibration chain Under construction: detector and source - based Absolute Radiometer (cryogenic) Transfer Radiometers Filter Radiometers temperature measurement high temperature blackbody (HTBB) Primary Standard Source High Temperature Fixed Points LIS lamp FEL lamp Primary Standard Pyrometer Pyrometers Photometry Spectroradiometry Radiation Thermometry

14 Optical radiation calibration chain Filter radiometers (5) Thermometric Photometric Spectroradiometric

15 Optical radiation calibration chain Photometer filter radiometer V(l)-correcting filter aperture photodiode aluminum cell thermo-electric coolers

16 Optical radiation calibration chain Photometer filter radiometer Source of Uncertainty Type of Uncertainty Standard Uncertainty Spectral responsivity B 0.14% Spatial uniformity B 0.20% Aperture area B 0.07% Spectral mismatch B 0.06% Temperature control B 0.04% Aging B 0.03% Lamp to photometer distance d A 0.20% Photocurrent A 0.02% Combined standard uncertainty 0.33%

17 Optical radiation calibration chain Under construction: detector and source - based Absolute Radiometer (cryogenic) Transfer Radiometers Filter Radiometers temperature measurement high temperature blackbody (HTBB) Primary Standard Source High Temperature Fixed Points LIS lamp FEL lamp Primary Standard Pyrometer Pyrometers Photometry Spectroradiometry Radiation Thermometry

18 Optical radiation calibration chain Spectroradiometry: spectral irradiance Absolute Radiometer (room temperature) narrow-band filter detector based interpolation fit extrapolation is not valid high temperature blackbody (HTBB) Primary Standard Source thermodynamic T=? L l,t c 1 l 5 exp c 2 1 lt Planck equation

19 Optical radiation calibration chain Filter radiometers for spectroradiometry T L m (l m,t) i T HTBB filter radiometer L m L m l m,t l m 5 c 1 exp c 2 1 l m T m measured value l m Measure the BB output at one wavelength

20 Optical radiation calibration chain Filter radiometers for spectroradiometry HTBB FR0 FR4 FR2 FR1 FR3

21 HTBB Temperature (K) Optical radiation calibration chain Filter radiometers for spectroradiometry k=2 uncertainties

22 Optical radiation calibration chain Spectral Irradiance: NIST NRC Absolute Radiometer NIST NRC CIE FEL Lamps HTBB: K

23 Optical radiation calibration chain Spectral Irradiance: transfer facility (under construction) Filter Radiometer transfer standard lamps HTBB High-Temperature Black-Body Transfer standard lamps (incandescent) spectroradiometer filter radiometers

24 Calibration services Incandescent Sources Solid State Sources peak intensity axis #2 mechanical axis optical axis peak intensity axis

25 Calibration services Solid State Sources (facility under development) LED front tip Averaged LED Intensity (CIE 127:2007) detector aperture circular acceptance area of 100 mm 2 mechanical axis Condition B d B = 100 mm Condition A d A = 316 mm

26 Calibration services Solid State Sources (facility under development) Partial LED Flux (CIE 127:2007) d 50 mm circular aperture

27 Calibration services Photometry of Incandescent Lamps - total luminous flux (lumen standards) - luminous intensity standards - illuminance standards Calibration of Photometric Instruments and Sources - illuminance meters - luminance meters - luminance sources Spectroradiometry - spectral irradiance lamp standards - spectral radiance source standards - spectroradiometers - irradiance - radiance SSL facility

28 Discussion Thank you

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