Realization of the spectral irradiance scale in the air-ultraviolet using thermal radiators

ller, W M; Sperfeld, Peter; Nawo, B.; Hube, K.; Metzdorf, J.

doi:10.1088/0026-1394/35/4/8

Cited by 5 publications

(4 citation statements)

References 4 publications

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“…The improved stability achieved is useful to reduce the uncertainty of the maintained and disseminated spectral-irradiance scales, where it is even possible to extend the useful spectral range down to 200 nm covering the whole air-UV range [4].…”

Section: Discussionmentioning

confidence: 99%

A new FEL-type quartz-halogen lamp as an improved standard of spectral irradiance

Metzdorf¹,

Sperling²,

Winter³

et al. 1998

Metrologia

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Based on extensive investigations of almost 100 high-power quartz-halogen lamps covering thirteen different types, seven different manufacturers and different batches with a total operating time of about 27000 h, a new type of lamp (1000 W T6 modified FEL-type lamp, Osram Sylvania Inc.) has been selected and its operating conditions have been optimized. This lamp, which after seasoning is about ten times more stable than the best lamps used before, is recommended as a reference and transfer standard of spectral irradiance in the whole range between 250 nm and 3 µm. While excellent short-term and long-term stability over operating times of several hundreds of hours can be achieved, the disadvantages of the new standard lamp lie in a long seasoning time (80 h to 100 h) and a noticeable sensitivity of the seasoned lamps to shock and vibrations. Typical results of the characterization, calibration and reproducibility of the new standard lamp are presented and discussed in order to illustrate its performance and to demonstrate how to use it under optimal operation conditions.

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Section: Discussionmentioning

confidence: 99%

A new FEL-type quartz-halogen lamp as an improved standard of spectral irradiance

Metzdorf¹,

Sperling²,

Winter³

et al. 1998

Metrologia

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“…For spectral (radiance or irradiance) calibrations in the ultraviolet, 30 W deuterium lamps with a discharge current of 300 mA are generally used as transfer standards. As a result of previous experiences and the great variety of lamps of this 1 References to commercial products are provided for identification purposes only and constitute neither endorsement nor representation that the item identified is the best available for the stated purpose. type, we chose the same basic electrical parameters for this intercomparison.…”

Section: Lamp Types In the Investigationmentioning

confidence: 99%

“…The lamp types differ in terms of the material and position of the windows, the shape and size of front and arc apertures, anode materials, heater voltages and other parameters. The main problem with deuterium lamps is a strong wavelength-dependent ageing of the lamp in connection with a reduction in the spectral irradiance of up to about 0.1% per hour of operating time and a poor reproducibility between different arc ignitions [1,2]. In past intercomparisons of spectral irradiance unsatisfactory results were obtained due to poor quality transfer standards [3,4].…”

Section: Introductionmentioning

confidence: 99%

Characterization and use of deuterium lamps as transfer standards of spectral irradiance

et al. 2003

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Subcomparison CCPR-K1.b of the CCPR key comparison of spectral irradiance covering 200 nm to 400 nm will be carried out in 2002/03 piloted by the Physikalisch-Technische Bundesanstalt (PTB) in Braunschweig, Germany. Deuterium arc lamps will be used as transfer standards of spectral irradiance, although they are known to have, in general, poor stability and reproducibility. PTB investigated a variety of deuterium lamps to test their capability (stability and reproducibility) for use as transfer standards. A measurement facility capable of characterizing up to three lamps at a time has been set up. Investigations of the spectral ageing pattern will help to interpolate between different reference measurements to markedly reduce the influence of ageing effects. The application of an external SiC photodiode as a monitor detector was tested. Spatial characterization of the irradiance of each lamp was also carried out. All this all helped us to find suitable types of lamp, producing reasonable irradiance homogeneously enough to be non-sensitive to small misalignments.

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“…The spectral irradiance scale will be extended down to 200 nm using thermal radiators as primary and as transfer standards. A new spectroradiometer has been set up at the PTB in Braunschweig and will be improved [12]. Using the black body at operating temperatures above 3200 K, 1000 W tungsten-halogen lamps can be calibrated down to 200 nm.…”

Section: Conclusion and Future Improvementsmentioning

confidence: 99%

Improvement and extension of the black-body-based spectral irradiance scale

et al. 1998

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Using a new, high-temperature black-body radiator developed by the All-Russian Institute for Optophysical Measurements (VNIIOFI), Moscow, and applying newly developed methods and equipment, the black-body-based spectral irradiance scale of the Physikalisch-Technische Bundesanstalt (PTB), Braunschweig, has been extended and its uncertainties have been reduced compared with previous results. The pyrolytic-graphite Planckian radiator BB3200pg, which can be operated at temperatures up to over 3300 K, is presented and characterized along with modifications to optimize uniformity and stability. The determination of the radiometric black-body temperatures is already well established by measuring the weighted irradiance using filter detectors without imaging systems. This method is compared and verified with results based on self-consistent spectral irradiance measurements using fast-scanning spectroradiometers. In addition, a laser-based method for the determination of the radiometric temperature is presented and compared with conventional procedures of radiationtemperature measurement. The implementation of this additional method into the radiometric chain of the PTB is illustrated. Improvements in the uncertainty budget of the spectral irradiance scale are discussed.

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Realization of the spectral irradiance scale in the air-ultraviolet using thermal radiators

Cited by 5 publications

References 4 publications

A new FEL-type quartz-halogen lamp as an improved standard of spectral irradiance

A new FEL-type quartz-halogen lamp as an improved standard of spectral irradiance

Characterization and use of deuterium lamps as transfer standards of spectral irradiance

Improvement and extension of the black-body-based spectral irradiance scale

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