A method for spectral irradiance measurement based on a large area WC-C fixed point blackbody

Wang, Yanfei; Dai, Caihong; Khlevnoy, B. B.; Grigoryeva, Irina; Li, Ling; Wu, Zhifeng; Xie, Yihang; He, Shaoming

doi:10.1364/oe.401626

Cited by 3 publications

(3 citation statements)

References 20 publications

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“…When the second melting plateau appeared, the optical platform was moved quickly to the position of the spectral comparator to measure the signal of the HTFP at several wavelengths. When the measurement was completed, the optical platform was quickly moved back to the position of the pyrometer to monitor the end of the melting curve [20,22]. Because of limited number of spectral point could be measure by a comparator during one melting plateau, a few melt/freeze cycles were done to cover the whole spectral range from 250 nm to 2500 nm.…”

Section: Measurement Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…In order to meet the increasing needs for high accuracy calibration of spectral irradiance in various fields in China, a large-area WC-C high temperature fixed-point blackbody system was set up at NIM, which is composed of a 14 mm diameter WC-C cell and a BB3500MP furnace with a radiator inner diameter of 59 mm in 2019 [20,21]. Based on the large area WC-C HTFP, NIM put forwarded a method for spectral irradiance measurement of the FEL lamp in the wavelength from 450 nm to 1000 nm [20]. Subsequently, in order to improve the measurement uncertainty of spectral irradiance measurement, NIM proposed a selective multiple fit method suitable to calculate the point of infection (POI) of large area HTFP [21], and then adopted Akima fitting method to recover the missing part of the melting plateau curve during spectral irradiance measurement [22].…”

Section: Introductionmentioning

confidence: 99%

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Spectral irradiance scale realization and uncertainty analysis based on a 14 mm diameter WC–C fixed point blackbody from 250 nm to 2500 nm

Dai

Wang

et al. 2022

Metrologia

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Spectral irradiance scale in the wavelength range from 250 nm to 2500 nm was realized at National Institute of Metrology (NIM) on the basis of a large area tungsten carbide–carbon (WC-C) high temperature fixed point blackbody, which is composed of a 14 mm diameter WC-C fixed point cell and a variable temperature blackbody BB3500MP as a furnace. A series of 1000 W FEL tungsten halogen lamps were used as transfer standards. The new spectral irradiance scale was compared with the scale based on a variable-temperature blackbody BB3500M, and the divergence between these two methods varied from -0.66% to 0.79% from 280 nm to 2100 nm. The measurement uncertainty of spectral irradiance scale based on fixed-point blackbody was analyzed, and the expanded uncertainty was estimated as 3.9% at 250 nm, 1.4% at 280 nm, 0.43 % at 400 nm, 0.27% at 800 nm, 0.25% at 1000 nm, 0.62% at 1500 nm, 0.76% at 2000 nm, and 2.4% at 2500 nm respectively. In the range from 300 nm to 1000 nm the fixed-point scale was improved obviously: the uncertainty decreased by more than 25% compared to the uncertainty based on the variable temperature blackbody. Below 300 nm, the uncertainty became higher because the signal to noise ratio was poor. Above 1100 nm, the contribution of temperature measurement to the uncertainty of spectral irradiance decreases, therefore the uncertainties of two methods are almost at the same level. The fixed-point blackbody was also used to realize the correlated colour temperature and distribution temperature of a tungsten filament lamp, the deviation from the variable temperature blackbody method was -0.5 K and -2.9 K, respectively.

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Section: Measurement Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Spectral irradiance scale realization and uncertainty analysis based on a 14 mm diameter WC–C fixed point blackbody from 250 nm to 2500 nm

Dai

Wang

et al. 2022

Metrologia

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Calibration method of ultraviolet radiant exposure meters

Zhuang,

Wang,

Dai

et al. 2024

Optical Metrology and Inspection for Industrial Applications XI

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Ultraviolet radiant exposure meter, also known as UV energy meter, is widely used in a multitude of fields, such as sterilization, climate change, solar photovoltaic, material aging, medical health, UV curing, lithography and so on. Ultraviolet exposure radiation meter is a commonly used instrument to measure ultraviolet radiation. Due to the particularity of the structure and the complexity of the influencing factors, the measurement error of commercial instruments is very high. Commonly used ultraviolet light sources include mercury lamps, LED light sources, metal halogen lamps and so on. This paper will study the calibration method of the ultraviolet exposure radiation meter, and evaluate the measurement uncertainty.

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Approximation of a melting plateau of large area HTFP cells used for spectral irradiance realization

et al. 2021

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This paper adopted an approximation of a melting plateau to solve the problem that temperature data cannot be monitored continuously when measuring the spectral irradiance of a large area tungsten carbide–carbon high-temperature fixed-point blackbody at each measured wavelength. Tests with fully measured curves showed that the method has a rather small deviation from the measured data of 0.017 K maximum, which corresponds to the spectral irradiance deviation of 0.005% at 500 nm. The maximum relative deviation between the Akima fitting method and the measured temperature in terms of spectral irradiance was 0.002%, which was better than − 0.067 % of a single temperature of 3020.11 K method and 0.026% of a linear interpolation method.

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A method for spectral irradiance measurement based on a large area WC-C fixed point blackbody

Cited by 3 publications

References 20 publications

Spectral irradiance scale realization and uncertainty analysis based on a 14 mm diameter WC–C fixed point blackbody from 250 nm to 2500 nm

Spectral irradiance scale realization and uncertainty analysis based on a 14 mm diameter WC–C fixed point blackbody from 250 nm to 2500 nm

Calibration method of ultraviolet radiant exposure meters

Approximation of a melting plateau of large area HTFP cells used for spectral irradiance realization

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