Absolute Radiometer for Reproducing the Solar Irradiance Unit

Sapritskii, V. I.; Pavlovich, M. N.

doi:10.1088/0026-1394/26/2/001

Cited by 9 publications

(4 citation statements)

References 5 publications

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“…The cavity TPD used for the comparison is of the type PP1 manufactured by VNIIOFI, Russia [5,6]. Due to its double cavity design and the compensation operating principle (Fig.…”

Section: Relative Spectral Responsivity Characterizationmentioning

confidence: 99%

1.2 - Absolute Mid-infrared Spectral Responsivity Scale Based on Thermal Detectors and the Cryogenic Radiometer

Taubert¹,

Meindl²,

Monte³

et al. 2017

Proceedings IRS² 2017

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The Physikalisch-Technische Bundesanstalt (PTB) has extended its capability for the realization and dissemination of the absolute spectral responsivity of thermal detectors from the near-infrared into the mid infrared (MIR) wavelength range. The calibration method relies on the application of a large area, multi-junction thin film thermopile detector as a transfer standard, characterized with two independent approaches in terms of its MIR spectrally flat (in a word: grey) relative spectral responsivity. The required SI traceability is achieved through absolute calibrations in the wavelength range from 1.5 µm to 2.4 µm against the PTB national detector standard, the cryogenic electrical substitution radiometer. In combination with an upgraded MIR dedicated spectral comparator setup, this allows the measurement and dissemination of the spectral responsivity up to a wavelength of 5 µm with relative standard uncertainties below 2 %.

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“…The cavity TPD used for the comparison is of the type PP1 manufactured by VNIIOFI, Russia [5,6]. Due to its double cavity design and the compensation operating principle (Fig.…”

Section: Relative Spectral Responsivity Characterizationmentioning

confidence: 99%

1.2 - Absolute Mid-infrared Spectral Responsivity Scale Based on Thermal Detectors and the Cryogenic Radiometer

Taubert¹,

Meindl²,

Monte³

et al. 2017

Proceedings IRS² 2017

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“…A rotatable mirror ( 9) is positioned just in front of the entrance slit of the monochromator. Adjustment of the sources is effected through the use of a laser (14). The spectrometer translation along the special carriage (1 3) is electrically driven, and positions are repeatable to about f 0,5 mm.…”

Section: Realization Of Spectral Irradiance E (A) and Spectral Radian...mentioning

confidence: 99%

National Primary Radiometric Standards of the USSR

Sapritskii¹

1990

Metrologia

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A versatile combined primary standard of the USSR has been established at VNIIOFI for the realization of radiometric units. The standard is based on two black bodies, operable at temperatures from 400 to 3000 K, and an absolute radiometer. Units of both spectral and broadband quantities are reproduced within the 0,2 pm to 25 pm range. A black-body radiator made of niobium carbide and graphite is used over the temperature range of 1500-3000 K, while that for the lower temperatures from 400 to 1200K is a heat-pipe with a sodium heattransfer medium. In order to determine the thermodynamic temperature T of the high-temperature black body, relative values of radiant flux P, ( T ) and spectral radiance Le, (ii, 7;) at several temperatures are found. The method allows realization of radiometric and photometric quantities irrespective of the International Practical Temperature Scale (IPTS-68). The absolute radiometer used is of a special design and has a control system capable of maintaining the conical receiving cavity at constant temperature throughout the measurement process. The absolute radiometer is intended to realize radiometric units as well as to measure the spectral sensitivity of radiation receivers.

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“…Examples of characterization of solar ACRs can be found in the literature, although such characterizations are mainly performed by the own designers and manufacturers of each model of instrument [37,[40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56][57]. Of key importance have been the characterization and calibration of solar radiometers used in space missions involved in the measurement of TSI and ERB, because of the discrepancies found in the irradiance measured by different generations of instruments and spacecraft [2,7].…”

Section: Introductionmentioning

confidence: 99%

Characterization of absolute cavity radiometers for traceability to SI of solar irradiance

Balenzategui

Lucas²,

Cuenca³

et al. 2022

Meas. Sci. Technol.

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Solar-type Cavity Radiometers are instruments of the highest metrological level for measuring solar Direct Normal Irradiance. To ensure their traceability and performance, they are periodically compared to the World Group of Standards, which realises the World Radiometric Reference (WRR), in the International Pyrheliometer Comparisons (IPC). Additionally, they can be characterized in an absolute way, with direct traceability to SI units and with their measurement uncertainty calculated. This paper describes the different techniques and procedures applied for the characterization and calibration of solar cavity radiometers, with the main results obtained to date in the case of an Automatic Hickey-Frieden (AHF) radiometer. Voltmeters, resistors, temperature sensors and the area of the precision apertures have been calibrated, while the effective absorptance, temperature coefficients, optical scattering and non-equivalence factor have been evaluated. The temperature dependence of the electrical current in the cavity heater has also been analysed. The resulting corrections obtained for the AHF by characterization are compatible with the WRR factors obtained by this instrument in the past IPCs. An uncertainty of 0.42 % (k = 1) has been obtained, and this paper discusses further improvements that may be able to reduce this figure to the desired expanded uncertainty of U = 0.1 % (k = 2).

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Absolute Radiometer for Reproducing the Solar Irradiance Unit

Cited by 9 publications

References 5 publications

1.2 - Absolute Mid-infrared Spectral Responsivity Scale Based on Thermal Detectors and the Cryogenic Radiometer

1.2 - Absolute Mid-infrared Spectral Responsivity Scale Based on Thermal Detectors and the Cryogenic Radiometer

National Primary Radiometric Standards of the USSR

Characterization of absolute cavity radiometers for traceability to SI of solar irradiance

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