Intercomparison Between Independent Irradiance Scales Based On Silicon Photodiode Physics, Gold-Point Blackbody Radiation, And Synchrotron Radiation

Schaefer, A. R.; Saunders, Robert D.; Hughey, L. R.

doi:10.1117/12.7973925

Cited by 12 publications

(6 citation statements)

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“…Although these changes are well within the quoted uncertainties for routine NIST measurement services, they will have an effect to reconcile small discrepancies between radiometric scales that have been observed in recent years. For example: In an intercomparison between independent radiometric scales based on silicon-photodiode physics, gold-point blackbody radiation, and synchrotron radiation, Schaefer, Saunders, and Hughey [ 8 ] found that the blackbody scale indicated a spectral irradiance at 600 nm which was about 0.8% higher than the detector scale, and about 1% higher than the synchrotron scale. The −0.25 K adjustment of the gold-point temperature improves the overall agreement of these intercomparisons.…”

Section: Radiometric Significance Of the Gold Pointmentioning

confidence: 99%

Spectroradiometric determination of the freezing temperature of gold

Mielenz

1990

J. RES. NATL. INST. STAN.

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A direct spectroradiometric determination of the temperature of freezing gold was performed by measuring the spectral radiances of a gold blackbody relative to those of a laser-irradiated integrating sphere which was calibrated with absolute silicon detectors and an electrically calibrated radiometer. The measurements were performed at three laser wavelengths near 600 nm, and the temperature of the blackbody was calculated by substituting the measured spectral radiances into Planck’s radiation formula. The result obtained, TAu=(1337.33± 0.34) K, is 0.25 K below the gold-point assignment in the International Practical Temperature Scale of 1968 (IPTS-68) and has been adopted in September 1990 as the new gold-point value in the International Temperature Scale of 1990 (ITS-90). The effect of this change in the gold-point assignment on pyrometric, radiometric, and photometric measurement services provided by the National Institute of Standards and Technology is assessed.

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Section: Radiometric Significance Of the Gold Pointmentioning

confidence: 99%

Spectroradiometric determination of the freezing temperature of gold

Mielenz

1990

J. RES. NATL. INST. STAN.

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“…In 1986, independent irradiance scales maintained by NIST based on blackbody or synchrotron radiation were compared with scales established on the laser calibration facility based on silicon photodiode physics traceable to cryogenic radiometry. 8 In 1990, absolute spectral radiometric measurements of the melting and freezing points of a gold blackbody were made at NIST using the laser-based facility. 9 The radiometric temperature was in agreement with the gold-point value established in the International Temperature Scale of 1990 (ITS-90).…”

Section: Introductionmentioning

confidence: 99%

Facility for spectral irradiance and radiance responsivity calibrations using uniform sources

2006

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Detectors have historically been calibrated for spectral power responsivity at the National Institute of Standards and Technology by using a lamp-monochromator system to tune the wavelength of the excitation source. Silicon detectors can be calibrated in the visible spectral region with combined standard uncertainties at the 0.1% level. However, uncertainties increase dramatically when measuring an instrument's spectral irradiance or radiance responsivity. We describe what we believe to be a new laser-based facility for spectral irradiance and radiance responsivity calibrations using uniform sources (SIRCUS) that was developed to calibrate instruments directly in irradiance or radiance mode with uncertainties approaching or exceeding those available for spectral power responsivity calibrations. In SIRCUS, the emission from high-power, tunable lasers is introduced into an integrating sphere using optical fibers, producing uniform, quasi-Lambertian, high-radiant-flux sources. Reference standard irradiance detectors, calibrated directly against national primary standards for spectral power responsivity and aperture area measurement, are used to determine the irradiance at a reference plane. Knowing the measurement geometry, the source radiance can be readily determined as well. The radiometric properties of the SIRCUS source coupled with state-of-the-art transfer standard radiometers whose responses are directly traceable to primary national radiometric scales result in typical combined standard uncertainties in irradiance and radiance responsivity calibrations of less than 0.1%. The details of the facility and its effect on primary national radiometric scales are discussed.

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“…Only after a technique was developed to measure the beam current based on electron counting in the early 1980s 22,23 did the SURF become an independent primary source standard, and the SURF-based irradiance scale was compared with blackbody and silicon photodiode scales at 600 nm. 24 Soon after, the comparison moved to the UV where a few wavelengths were compared with other irradiance transfer standards such as quartz-tungsten halogen lamps and argon miniarcs. 25,26 A more thorough irradiance scale comparison was performed in 1998 from 210 to 300 nm on SURF II.…”

Section: Introductionmentioning

confidence: 99%

Synchrotron radiation-based irradiance calibration from 200 to 400 nm at the Synchrotron Ultraviolet Radiation Facility III

et al. 2007

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A new facility for measuring irradiance in the UV was commissioned recently at the National Institute of Standards and Technology (NIST). The facility uses the calculable radiation from the Synchrotron Ultraviolet Radiation Facility as the primary standard. To measure the irradiance from a source under test, an integrating sphere spectrometer-detector system measures both the source under test and the synchrotron radiation sequentially, and the irradiance from the source under test can be determined. In particular, we discuss the calibration of deuterium lamps using this facility from 200 to 400 nm. This facility improves the current NIST UV irradiance scale to a relative measurement uncertainty of 1.2% (k=2).

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Intercomparison Between Independent Irradiance Scales Based On Silicon Photodiode Physics, Gold-Point Blackbody Radiation, And Synchrotron Radiation

Cited by 12 publications

References 0 publications

Spectroradiometric determination of the freezing temperature of gold

Spectroradiometric determination of the freezing temperature of gold

Facility for spectral irradiance and radiance responsivity calibrations using uniform sources

Synchrotron radiation-based irradiance calibration from 200 to 400 nm at the Synchrotron Ultraviolet Radiation Facility III

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