Comparison of monochromator-based and laser-based cryogenic radiometry

Schrama, C. A.; Bosma, R.; Gibb, K; Reijn, H; Bloembergen, P.

doi:10.1088/0026-1394/35/4/37

Cited by 21 publications

(23 citation statements)

References 8 publications

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“…To that purpose the RTs were compared against radiometric standards employing the facilities at NMi-VSL. 16,17 Results of spectral responsivity measurements for broadband LT systems, implying the assembled instrument as a whole being characterized for this parameter, turned out to deviate significantly from results obtained by adding separate determined contributions from optics, band-pass filter and detector. 18 The latter procedure has been applied by some of the industrial partners, neglecting inter-reflections between components and chromatic aberrations that also contribute to the overall responsivity.…”

Section: Dissemination Of Its-90; Improving Traceabilitymentioning

confidence: 91%

Traceability toward industry: from TRIRAT to ILART

2003

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The impact of thermal radiation and its associated radiance temperature on nearly all facets of technology and society is tremendous. Reliable temperature measurements are in that context of vital importance in many areas in science, technology, industry and environmental protection. This implies the use of a sound traceability framework, involving accurate reference standards to begin with and a calibration procedure for radiation thermometers that incorporates all sources of measurement errors (uncertainties). Latter procedure should be two-fold; first a traceable comparison is made against a blackbody radiator, then the instrument is evaluated and/or calibrated in its application.In this paper all three traceability steps will be addressed, that is, the dissemination of the international temperature scale of 1990 (ITS-90) and the initial and on-site calibration of radiation thermometers. First two steps were investigated in detail and improved on European level in the TRIRAT program that was funded by the European Community. This included international intercomparisons for radiation thermometer calibrations and recommendations for the standardization and testing of infrared radiation thermometers as transfer standards. An other project, ILART, bridges the gap in traceability between initial calibrated radiation thermometers and their industrial application. It involves realization of a portable calibration facility, intrinsically insensitive for surface emissivity and reflection error using active two-color thermometry.

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Section: Dissemination Of Its-90; Improving Traceabilitymentioning

confidence: 91%

Traceability toward industry: from TRIRAT to ILART

2003

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“…The UV-VIS DFU was calibrated on the Absolute Cryogenic Radiometer (ACR) facility at VSL, which is the primary standard for radiometry in the Netherlands [5,12]. Fig.…”

Section: Calibrationmentioning

confidence: 99%

“…The most accurate radiometric detectors are electrical cryogenic substitution radiometers (ESCRs) [3][4][5], used in combination with a tuneable light source to realize a spectral irradiance scale. These types of detectors are indeed used at NMIs as primary standards.…”

Section: Introductionmentioning

confidence: 99%

Portable traceability solution for ground-based calibration of optical instruments

Gawhary¹,

Veghel²,

Kenter

et al. 2017

International Conference on Space Optics — ICSO 2014

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-We present a portable traceability solution for the ground-based optical calibration of earth observation (EO) instruments. Currently, traceability for this type of calibration is typically based on spectral irradiance sources (e.g. FEL lamps) calibrated at a national metrology institute (NMI). Disadvantages of this source-based traceability are the inflexibility in operating conditions of the source, which are limited to the settings used during calibration at the NMI, and the susceptibility to aging, which requires frequent recalibrations, and which cannot be easily checked on-site. The detector-based traceability solution presented in this work uses a portable filter radiometer to calibrate light sources onsite, immediately before and after, or even during instrument calibration. The filter radiometer itself is traceable to the primary standard of radiometry in the Netherlands. We will discuss the design and realization, calibration and performance verification.

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“…Depending on the actual bandwidth used to derive the experimental value of the responsivity, a correction factor is applied before using it, in order to homogenize the value set. Many authors have dealt with this problem [1][2][3][4][5][6][7][8][9], because it is one of the questions that has to be solved when one is deriving any radiometric scale from measurements made with silicon photodiodes or any other broad band selective radiometer. However, the study has always been restricted to the specific problem considered every time and the spectral bandpass function has not always taken into account the influence of the broad band radiation source used in front of the spectral analysis system (a monochromator or interference filters).…”

Section: Introductionmentioning

confidence: 99%

Spectral responsivity uncertainty of silicon photodiodes due to calibration spectral bandwidth

Campos

Corróns

Aglio

et al. 2001

Meas. Sci. Technol.

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A systematic study on the uncertainty in spectral responsivity of silicon photodiodes due to the calibration spectral bandwidth is presented. Two of the most common types of silicon photodiodes in the field of optical power measurements have been used in this work: one with thickness of about 100 nm of SiO 2 and the other with thickness about 27 nm of SiO 2 . It is shown that the spectral responsivity error will be negligible ( 5 × 10 −4 ) using a spectral bandwidth up to 20 nm in the calibration if the effective wavelength of the spectral transfer function, including the distribution of the radiation source, is calculated and the measured responsivity is assigned to that effective wavelength. In other cases, the error depends not only on the extent of the interval isolated by the spectral analysis system but also on the shape of the spectral isolation function.

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Comparison of monochromator-based and laser-based cryogenic radiometry

Cited by 21 publications

References 8 publications

Traceability toward industry: from TRIRAT to ILART

Traceability toward industry: from TRIRAT to ILART

Portable traceability solution for ground-based calibration of optical instruments

Spectral responsivity uncertainty of silicon photodiodes due to calibration spectral bandwidth

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