Spectral irradiance measurements of tungsten lamps with filter radiometers in the spectral range 290 nm to 900 nm

Kübarsepp, Toomas; Kärhä, Petri; Manoocheri, Farshid; Nevas, Saulius; Ylianttila, Lasse; Ikonen, Erkki

doi:10.1088/0026-1394/37/4/7

Cited by 35 publications

(56 citation statements)

References 27 publications

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“…There is a double monochromator Brewer Mk‐III spectrophotometer at Jokioinen, whereas at Sodankylä, the surface UV irradiance is measured with a single monochromator Brewer Mk‐II. Both Brewers are calibrated with 1000 W lamps traceable to the irradiance scale of Helsinki University of Technology [ Kübarsepp et al , 2000]. They are scheduled to perform spectral scans at fixed solar zenith angles, and, additionally, at solar noon each day.…”

Section: Ground‐based Reference Datamentioning

confidence: 99%

Validation of daily erythemal doses from Ozone Monitoring Instrument with ground‐based UV measurement data

et al. 2007

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[1] The Dutch-Finnish Ozone Monitoring Instrument (OMI) on board the NASA EOS Aura spacecraft is a nadir viewing spectrometer that measures solar reflected and backscattered light in a selected range of the ultraviolet and visible spectrum. The instrument has a 2600 km wide viewing swath and it is capable of daily, global contiguous mapping. The Finnish Meteorological Institute and NASA Goddard Space Flight Center have developed a surface ultraviolet irradiance algorithm for OMI that produces noontime surface spectral UV irradiance estimates at four wavelengths, noontime erythemal dose rate (UV index), and the erythemal daily dose. The overpass erythemal daily doses derived from OMI data were compared with the daily doses calculated from the ground-based spectral UV measurements from 18 reference instruments. Two alternative methods for the OMI UV algorithm cloud correction were compared: the plane-parallel cloud model method and the method based on Lambertian equivalent reflectivity. The validation results for the two methods showed some differences, but the results do not imply that one method is categorically superior to the other. For flat, snow-free regions with modest loadings of absorbing aerosols or trace gases, the OMI-derived daily erythemal doses have a median overestimation of 0-10%, and some 60 to 80% of the doses are within ±20% from the ground reference. For sites significantly affected by absorbing aerosols or trace gases one expects, and observes, bigger positive bias up to 50%. For high-latitude sites the satellite-derived doses are occasionally up to 50% too small because of unrealistically small climatological surface albedo.

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Section: Ground‐based Reference Datamentioning

confidence: 99%

Validation of daily erythemal doses from Ozone Monitoring Instrument with ground‐based UV measurement data

et al. 2007

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“…The excellent performance of silicon trap-detector based filter radiometers leads to the true detector-based realization of the spectral irradiance scale at several NMIs [4,5]. This method measures the spectral irradiance generated by a tungsten halogen lamp directly using a large number of filter radiometers operating at different wavelengths.…”

Section: Introductionmentioning

confidence: 99%

Spectral irradiance comparison using a multi-wavelength filter radiometer

Liu

Ojanen³

et al. 2009

Metrologia

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An automatic multi-wavelength filter radiometer (MWFR) was developed at the National Metrology Centre (NMC) of Singapore to realize the spectral irradiance scale in the wavelength range from 250 nm to 1600 nm. The UV-VIS range (250 nm to 900 nm) is covered by a silicon trap detector with 17 filters, while the near IR range (900 nm to 1600 nm) is covered by an InGaAs photodiode with 7 filters. A complete run of measurements at all 24 wavelength points takes only 12 min. The spectral irradiance scales of NMC and MIKES/TKK (Finland) in the spectral range from 280 nm to 900 nm were compared successfully using this instrument. Measurement results of three standard lamps calculated using MIKES/TKK's algorithm showed excellent repeatability and very good agreement with their assigned values. It is concluded that, compared with the conventional monochromator based spectroradiometers, a properly designed MWFR with sufficient spectral coverage is a good alternative instrument for spectral irradiance comparison owing to its faster speed and better short-term reproducibility.

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“…Filter radiometers are also used to realize a spectral irradiance scale using incandescent lamps directly [13][14][15][16][17], that is, without the use of blackbodies. In such cases, filters having a relatively narrow spectral bandpass (10 nm to 50 nm usually) are required because of the spectral variation of the emissivity of the lamps [14].…”

Section: Filter Radiometer Designmentioning

confidence: 99%

Wideband filter radiometers for blackbody temperature measurements

Boivin¹,

Bamber²,

Gaertner³

et al. 2010

Journal of Modern Optics

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The use of high-temperature blackbody (HTBB) radiators to realize primary spectral irradiance scales requires that the operating temperature of the HTBB be accurately determined. We have developed five filter radiometers (FRs) to measure the temperature of the National Research Council of Canada's HTBB. The FRs are designed to minimize sensitivity to ambient temperature fluctuations. They incorporate air-spaced colored glass filters and a Si photodiode detector that are housed in a cell whose temperature is controlled to AE0.1 C by means of annular thermoelectric elements at the front and rear of the cell. These wideband filter radiometers operate in four different wavelength bands. The spectral responsivity measurements were performed in an underfill geometry for a power-mode calibration that is traceable to NRC's cryogenic radiometer. The spectral temperature sensitivity of each of these FRs has been measured. The apertures for these FRs were cold-formed by swaging machine-cut apertures onto precision dowel pins. A description of the filter radiometer design, fabrication and testing, together with a detailed uncertainty analysis, is presented. We derive the equations that relate the spectral irradiance measured by the FRs to the spectral radiance and temperature of the HTBB, and deal specifically with the change of index of refraction over the path of the radiation from the interior of the HTBB to the FRs. We believe these equations are more accurate than recently published derivations. Our measurements of the operating temperature of our HTBB working at temperatures near 2500 K, 2700 K and 2900 K, together with measurements using a pyrometer, show agreement between the five filter radiometers and with the pyrometer to within the estimated uncertainties.

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Spectral irradiance measurements of tungsten lamps with filter radiometers in the spectral range 290 nm to 900 nm

Cited by 35 publications

References 27 publications

Validation of daily erythemal doses from Ozone Monitoring Instrument with ground‐based UV measurement data

Validation of daily erythemal doses from Ozone Monitoring Instrument with ground‐based UV measurement data

Spectral irradiance comparison using a multi-wavelength filter radiometer

Wideband filter radiometers for blackbody temperature measurements

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