Improved calibration of the spectral responsivity of interference filter radiometers in the visible and near infrared spectral range at PTB

Taubert, D. R.; Friedrich, R; Hartmann, Jürgen; Hollandt, J.

doi:10.1088/0026-1394/40/1/309

Cited by 31 publications

(30 citation statements)

References 7 publications

(13 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The blackbody provides a very stable reference source of known spectral radiance using Planck's law. The cavity (pressed pyrographite rings) is heated by constant electrical current; the temperature of the cavity is radiometrically determined by the PTB using filter radiometers and is absolutely calibrated against a cryogenic primary detector standard (Friedrich et al 1995;Werner et al 2000;Taubert et al 2003). The diameter of the aperture was 11.909 ± 0.002 mm.…”

Section: Absolute Radiometric Calibrationmentioning

confidence: 99%

SOLAR/SOLSPEC mission on ISS: In-flight performance for SSI measurements in the UV

Bolsée

Pereira

Gillotay

et al. 2017

A&A

View full text Add to dashboard Cite

Context. The SOLar SPECtrum (SOLSPEC) experiment is part of the Solar Monitoring Observatory (SOLAR) payload, and has been externally mounted on the Columbus module of the International Space Station (ISS) since 2008. SOLAR/SOLSPEC combines three absolutely calibrated double monochromators with concave gratings for measuring the solar spectral irradiance (SSI) from 166 nm to 3088 nm. This physical quantity is a key input for studies of climatology, planetary atmospheres, and solar physics. Aims. A general description of the instrument is given, including in-flight operations and performance of the ultraviolet (UV) channel from 175 nm to 340 nm. Methods. We developed a range of processing and correction methods, which are described in detail. For example, methods for correcting thermal behavior effects, instrument linearity, and especially the accuracy of the wavelength and absolute radiometric scales have been validated by modeling the standard uncertainties. Results. The deliverable is a quiet Sun UV reference solar spectrum as measured by SOLAR/SOLSPEC during the minimum of solar activity prior to cycle 24. Comparisons with other instruments measuring SSI are also presented.

show abstract

Section: Absolute Radiometric Calibrationmentioning

confidence: 99%

SOLAR/SOLSPEC mission on ISS: In-flight performance for SSI measurements in the UV

Bolsée

Pereira

Gillotay

et al. 2017

A&A

View full text Add to dashboard Cite

show abstract

“…The spectral responsivity of the FR is traceable to the CR via a trap detector [1,6,7]. The photocurrent measured by the FR is given by the integral:…”

Section: Single-wavelength Absolute Radiometrymentioning

confidence: 99%

Thermodynamic Temperature of High-Temperature Fixed Points Traceable to Blackbody Radiation and Synchrotron Radiation

et al. 2017

View full text Add to dashboard Cite

Absolute spectral radiometry is currently the only established primary thermometric method for the temperature range above 1300 K. Up to now, the ongoing improvements of high-temperature fixed points and their formal implementation into an improved temperature scale with the mise en pratique for the definition of the kelvin, rely solely on single-wavelength absolute radiometry traceable to the cryogenic radiometer. Two alternative primary thermometric methods, yielding comparable or possibly even smaller uncertainties, have been proposed in the literature. They use ratios of irradiances to determine the thermodynamic temperature traceable to blackbody radiation and synchrotron radiation. At PTB, a project has been established in cooperation with VNIIOFI to use, for the first time, all three methods simultaneously for the determination of the phase transition temperatures of high-temperature fixed points. For this, a dedicated four-wavelengths ratio filter radiometer was developed. With all three thermometric methods performed independently and in parallel, we aim to compare the potential and practical limitations of all three methods, disclose possibly undetected systematic effects of each method and thereby confirm or improve the previous measurements traceable to the cryogenic radiometer. This will give further and independent confidence in the thermodynamic temperature determination of the high-temperature fixed point's phase transitions.

show abstract

“…Three filter radiometers were involved in the investigation, with center wavelengths of 476, 676, and 800 nm. These filter radiometers were characterized with respect to spectral irradiance responsivity traceable to the cryogenic radiometer RTCR of PTB [11]. The details of the filter radiometers and their setup principle are available in [5,12].…”

Section: Filter Radiometersmentioning

confidence: 99%

Large- and Small-Aperture Fixed-Point Cells of Cu, Pt–C, and Re–C

et al. 2008

View full text Add to dashboard Cite

Extending the application of metal (carbide)-carbon eutectic fixed-point cells to radiometry, e.g., for measurements in irradiance mode, requires fixed-point cells with large apertures. In order to make large-aperture cells more readily usable in furnace systems with smaller furnace tubes commonly used for small-aperture fixed-point cells, a novel cell design was developed. For each of Cu, Pt-C, and Re-C fixed points, two types of fixed-point cells were manufactured, the small-and largeaperture cell. For Pt-C and Re-C, the large-aperture cells were filled with a hypereutectic metal-carbon mixture; for the small cells, a hypo-eutectic mixture was used for filling. For each material, the small and large cells were compared with respect to radiometric differences. Whereas plateau shape and melting temperature are in good agreement for the small-and large-aperture Cu cells, a larger difference was observed between small-and large-aperture cells of Pt-C and Re-C, respectively. The origin of these observations, attributed to the temperature distribution inside the furnace, ingot contamination during manufacture, and non-uniform ingot formation for the larger cells, is discussed. The comparison of measurements by a radiation thermometer and filter radiometer of the Re-C and Pt-C large-aperture cells showed large differences that could be explained only by a strong radiance distribution across the cavity bottom. Further investigations are envisaged to clarify the cause.123 970 Int J Thermophys (2008) 29:969-983

show abstract

Improved calibration of the spectral responsivity of interference filter radiometers in the visible and near infrared spectral range at PTB

Cited by 31 publications

References 7 publications

SOLAR/SOLSPEC mission on ISS: In-flight performance for SSI measurements in the UV

SOLAR/SOLSPEC mission on ISS: In-flight performance for SSI measurements in the UV

Thermodynamic Temperature of High-Temperature Fixed Points Traceable to Blackbody Radiation and Synchrotron Radiation

Large- and Small-Aperture Fixed-Point Cells of Cu, Pt–C, and Re–C

Contact Info

Product

Resources

About