Absolute radiant flux measurement of the angular distribution of synchrotron radiation

Shaw, Ping‐Shine; Arp, Uwe; Lykke, Keith R.

doi:10.1103/physrevstab.9.070701

Cited by 5 publications

(5 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The calculability of the synchrotron radiation at SURF III was recently validated by scanning the angular distribution of synchrotron radiation by using a set of well-calibrated filter radiometers. 37 Good agreement was found between measurement and calculation.…”

Section: Establishment Of Irradiance Standard Using Synchrotron Radiamentioning

confidence: 80%

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

et al. 2007

Self Cite

View full text Add to dashboard Cite

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).

show abstract

Section: Establishment Of Irradiance Standard Using Synchrotron Radiamentioning

confidence: 80%

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

et al. 2007

Self Cite

View full text Add to dashboard Cite

show abstract

“…For instance, the electron energy of 500 MeV gives ψ/2 ≈ 1 mrad. The modern measurement facilities on the base of the electron storage ring allow employng the aperture of about 3 mm to 5 mm in diameter to measure the irradiance of the synchrotron radiation in the visible and near-IR spectral ranges [28,29].…”

Section: Blackbody Versus Synchrotronmentioning

confidence: 99%

Alternative Methods of Blackbody Thermodynamic Temperature Measurement Above Silver Point

Prokhorov¹,

Sapritsky

Khlevnoy

et al. 2015

Int J Thermophys

View full text Add to dashboard Cite

Presently, absolute radiometry is the main method of thermodynamic temperature determination above the silver point. The importance of such measurements has increased, as a large international project is underway aimed at assigning thermodynamic temperatures to high-temperature fixed points (HTFPs). All participants are using filter radiometers calibrated against an absolute cryogenic radiometer which, therefore, will be the basis of the provided thermodynamic temperatures of the fixed points. However, such a unified approach may lead to systematic errors (if any) common to all participants. There are methods, providing an alternative to absolute radiometry, which allow the determination of blackbody thermodynamic temperatures using relative measurements. Alternative methods, even if they have lower accuracy than absolute radiometry, could disclose some possible unrecognized systematic errors, or, on the contrary, could confirm the results obtained using absolute radiometry and increase confidence of the thermodynamic temperature determination. One such method, known as the method of ratios (i.e., double wavelength technique), is based on measuring the ratios of fluxes emitted by a blackbody in separate spectral ranges at two temperatures. This approach has been developed at VNIIOFI, but its realization met serious technical difficulties. Modern sensors with improved sensitivity and stability, extremely reproducible HTFP blackbodies, and significant progress in computational methods and computer performance provide a new chance to realize this approach with sufficient accuracy. Another method is based on comparing the ratio of fluxes 123 Int J Thermophys (2015) 36:252-266 253 measured at two wavelengths for a high-temperature blackbody with that measured for synchrotron radiation. This article overviews possibilities of the alternative methods for determination of blackbody thermodynamic temperatures by means of relative radiometry to attract attention of the thermometry and radiometry communities to the importance of international cooperation for realization of these methods.

show abstract

“…Geometrical factors greatly affect the uncertainty with which the absolute irradiance of the SR can be determined at FICUS. Therefore, the emitted SR was mapped spatially and the resulting distribution was used to determine the on-orbit position, which was then used during the measurements [17]. Each measurement was performed in the same manner.…”

Section: Long-term Monitoring Of Uv Irradiance Scalementioning

confidence: 99%

Long-term monitoring of the ultraviolet irradiance scale at the facility for irradiance calibration using synchrotrons

Li¹,

Shaw²,

Arp³

et al. 2010

Metrologia

Self Cite

View full text Add to dashboard Cite

In 2004, the National Institute of Standards and Technology established the ultraviolet spectral irradiance scale from 200 nm to 400 nm using the calculable irradiance of the Synchrotron Ultraviolet Radiation Facility (SURF). Since the establishment of the scale, spectral irradiance calibrations of many customer lamps have been performed in direct comparison with synchrotron radiation. However, to ensure long-term stability of the scale, three check-standard deuterium lamps were calibrated using SURF III at the same time as customer lamps were being calibrated. Here, we present the results of the long-term monitoring of the scale using these check-standard lamps to ensure customer lamps are calibrated within the expanded calibration uncertainty (k = 2) of 1.2%.

show abstract

Absolute radiant flux measurement of the angular distribution of synchrotron radiation

Cited by 5 publications

References 29 publications

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

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

Alternative Methods of Blackbody Thermodynamic Temperature Measurement Above Silver Point

Long-term monitoring of the ultraviolet irradiance scale at the facility for irradiance calibration using synchrotrons

Contact Info

Product

Resources

About