Current and future realizations NRC photometric and spectroradiometric calibration chains

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spectroradiometric calibration chains

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Current and Future Realizations

NRC Photometric and

Spectroradiometric Calibration Chains

Measurement Science and Standards (MSS)

Arnold A. Gaertner

Photometry, Radiometry and Thermometry (PRT)

CORM

30 May 2012

(3)

Photometry and Spectroradiometry

Outline

• Calibration and measurement services

• Present calibration chain

• Future calibration chain

• SSL facility

(4)

- 4 basic optical radiation measurement configurations • total flux • illuminance / irradiance • luminance / radiance • intensity

Measurement Geometries

Photometry and Spectroradiometry

illuminance irradiance luminance radiance intensity total flux

(5)

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

Required Working Standards

Total luminous flux lamp

Luminous intensity lamp

Spectral irradiance lamp

+ Diffuse reflectance standard

(6)

Working standard lamps

Total luminous flux

Luminous intensity

Spectral irradiance

Auxiliary

standards

(7)

Primary calibration

Measurement of absolute amount of optical radiation power

- SI units (watt)

- absolute radiometer

(8)

Photometric calibration chain (present)

Luminous Intensity:

Secondary Radiometers (Si photodiodes)

0.5% NRC candela maintained on lamps

Luminous Intensity Standard Absolute Radiometer (room temperature) LIS lamp V(l)-correcting filter

SI

CIE

(9)

Total Luminous Flux:

Absolute Radiometer (room temperature) Secondary Radiometers (Si photodiodes) V(l)-correcting filter LIS lamp 0.5%

NRC lumen maintained on lamps

Goniophotometer

1.0%

(10)

Spectral Irradiance (present):

Spectroradiometric calibration chain

detector based FEL lamp Absolute Radiometer (room temperature) narrow-band filter

(11)

Spectral Irradiance (present):

Spectroradiometric calibration chain

NRC spectral irradiance maintained on lamps (FEL)

FEL 1000W incandescent quartz-halogen NIST NRC Absolute Radiometer NRC CIE NIST

(12)

CCPR = Consultative Committee for Photometry and Radiometry

International Comparisons (CCPR)

(13)

Present:

detector - based

Optical radiation calibration chain

Absolute Radiometer (room temperature) Secondary Radiometers (Si photodiodes) V(l)-correcting filter LIS lamp FEL lamp narrow-band filter LFS lamp gonio photometer NIST

(14)

Optical radiation calibration chain

Under construction:

detector and source - based

Absolute Radiometer (cryogenic)

Transfer Radiometers

Filter Radiometers

LIS

lamp _lampFEL

Primary Standard Source high temperature blackbody (HTBB) temperature measurement Radiation Thermometry Spectroradiometry Photometry High Temperature Fixed Points Pyrometers Primary Standard Pyrometer

(15)

Optical radiation calibration chain

Filter radiometers (5)

Photometric

Thermometric

(16)

Optical radiation calibration chain

Photometer filter radiometer

aperture photodiode

thermo-electric coolers

aluminum cell V(l)-correcting filter

(17)

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%

(18)

Optical radiation calibration chain

Under construction:

detector and source - based

Absolute Radiometer (cryogenic)

Transfer Radiometers

Filter Radiometers

LIS

lamp _lampFEL

Primary Standard Source high temperature blackbody (HTBB) temperature measurement Radiation Thermometry Spectroradiometry Photometry High Temperature Fixed Points Pyrometers Primary Standard Pyrometer

(19)

Optical radiation calibration chain

Spectroradiometry: spectral irradiance

detector based Absolute Radiometer (room temperature) narrow-band filter

interpolation fit

extrapolation

is not valid

thermodynamic

T=?

Primary Standard Source high temperature blackbody (HTBB) ฀ L l_,T  c1 l5 _exp c2 lT      1    _ Planck equation

(20)

Optical radiation calibration chain

Filter radiometers for spectroradiometry

฀ L m



lm,T



 c 1 lm 5 exp c2 lmT      1       m measured value

T

฀

L

_m

฀

l

m

Measure the BB output at one wavelength HTBB T ฀ L m(lm,T)

i

filter radiometer

(21)

Optical radiation calibration chain

Filter radiometers for spectroradiometry

FR4 FR2

FR0

FR1 FR3

(22)

Optical radiation calibration chain

Filter radiometers for spectroradiometry

HT

BB

T

emp

era

ture

(K)

k=2 uncertainties

(23)

Optical radiation calibration chain

Spectral Irradiance:

NIST NRC Absolute Radiometer NRC CIE NIST FEL Lamps HTBB: 1 K @ 2900 K

(24)

Optical radiation calibration chain

Spectral Irradiance: transfer facility

(under construction)

Transfer standard lamps (incandescent) High-Temperature

Black-Body Filter Radiometer

transfer standard lamps HTBB

(25)

Calibration services

Incandescent Sources

Solid State Sources

mechanical axis

peak intensity axis

optical axis

(26)

Calibration services

Solid State Sources (facility under development)

mechanical axis Condition A d_A = 316 mm Condition B d_B = 100 mm

Averaged LED Intensity (CIE 127:2007)

LED front tip

detector aperture

(27)

Calibration services

Solid State Sources (facility under development)

Partial LED Flux (CIE 127:2007)

d

50 mm circular aperture

(28)

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