Total and spectral radiance measurements of blackbody radiation sources based on an absolute cryogenic radiometer

Gan, Haiyong; Xu, Nan; Liu, Xiangliang; He, Yingwei; Wu, Houping; Gao, Feng; Liu, Wende; Lin, Yandong

doi:10.1117/12.2547760

Cited by 4 publications

(3 citation statements)

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“…This method can be used to determine the emissivity of large-area, highly reflective samples at temperatures between 80 K and 300 K. The total absolute uncertainty (k = 1) was approximately 0.0002 to 0.002, and the emissivity was approximately 0.0035 to 0.092. The China National Institute of Metrology has developed an absolute low-temperature radiometer (ACR), which can be used for optical radiation power measurement [34]. The ACR cavity receiver was plated with pure copper, and the inner surface of the ACR cavity receiver was coated with a polymer material mixed with carbon nanotubes.…”

Section: Testing Devices Based On Radiometrymentioning

confidence: 99%

A review of devices and methods for measuring thermal emissivity at cryogenic temperatures

Zhang

2022

IOP Conf. Ser.: Mater. Sci. Eng.

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Thermal emissivity is an important parameter in characterizing the thermal radiative properties of materials and a critical factor in radiative heat transfer. The radiation of an actual object is different from that of the blackbody: its radiation energy varies irregularly with wavelength and temperature. To investigate the thermal radiative properties, thermal emissivity could be measured at cryogenic temperatures. In this paper, measuring methods and factors affecting the thermal emissivity of metals and infrared coatings at low temperatures were comprehensively reviewed. Two existing methods for measuring thermal emissivity at low temperatures, the calorimetry and radiometry methods, were described. Moreover, this work also discussed several factors such as material properties, surface temperature, and surface conditions. Testing devices for measurement of emissivity at low temperatures based on calorimetry and radiometry were reviewed and analyzed emphatically.

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Section: Testing Devices Based On Radiometrymentioning

confidence: 99%

A review of devices and methods for measuring thermal emissivity at cryogenic temperatures

Zhang

2022

IOP Conf. Ser.: Mater. Sci. Eng.

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“…As the outcome of the fast-growing QCL technology, QCLs become commercially available to cover a gap-free spectral range of (3)(4)(5)(6)(7)(8)(9)(10)(11)(12) μm. The finely-controlled long-term stability is highly required to further reduce the uncertainties of the ACR-based optical radiant power measurement and the SR scale.…”

Section: Future Improvementsmentioning

confidence: 99%

“…ACR-based low-background infrared facilities have been built to calibrate the radiance in the normal direction and consequently the radiant temperature of blackbody radiation sources [4][5][6][7][8]. The key parameters include the areas of two precision apertures, the distance between them, their relative orientation, as well as the total optical radiant power [9,10].…”

Section: Introductionmentioning

confidence: 99%

Mid-infrared spectral responsivity scale based on an absolute cryogenic radiometer and a tunable quantum cascade laser

Liu¹,

Xu²,

He³

et al. 2021

Metrologia

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The spectral optical radiant power of a quantum cascade laser (QCL) in the (7.35–10.6) µm spectral range has been measured using a Y-shape absolute cryogenic radiometer (ACR). The spectral responsivity (SR) of a transfer detector based on an integrating-sphere-coupled mercury-cadmium-telluride (IS-MCT) photoconductive detector has been calibrated. The optical radiant power of the QCL can be adjusted and stabilized in the range of (0.035–0.6) mW. The relative uncertainty of the ACR-based optical radiant power measurement was evaluated to be 0.023%–0.04% (k = 1). The relative uncertainty of the SR calibration of the IS-MCT transfer detector was analyzed to be 0.097%–0.16% (k = 1). The spectral range for the SR calibration can be extended to cover (3–12) µm using commercially available QCLs.

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Two-dimensional Keitz method for the radiant power measurement of planar ultraviolet excilamps

Zhu,

Li,

Han

et al. 2024

Appl. Opt.

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Planar XeBr∗ and XeCl∗ excilamps emitting noncoherent narrowband UVB light (280–315 nm) are now widely used to cure psoriasis and vitiligo as well as to improve vitamin D synthesis. The two-dimensional integral formula has been deducted in this study, which is a good method and has great practical significance to calculate the total radiant power and assess the energy efficiency of a planar UV lamp. The measured radiant power of planar white LED lamps through a two-dimensional Keitz formula has been compared to that of gonio-photometer, verifying the applicability of the formula. The optimum measurement distance is dependent on the lamp length (1.5L≤D≤3.5L) for which the derivation from the two methods can be controlled within 10%. The planar XeBr∗ excilamps have been measured and compared to coaxial excilamps, which show similar patterns of change for the radiant characteristics. Since the planar radiant power formula only needs to measure normal illuminance at a certain distance from the symmetric center of the lamp, it is more convenient to use and is a low-cost method to promote the development of large-sized planar ultraviolet lamps.

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Total and spectral radiance measurements of blackbody radiation sources based on an absolute cryogenic radiometer

Cited by 4 publications

References 0 publications

A review of devices and methods for measuring thermal emissivity at cryogenic temperatures

A review of devices and methods for measuring thermal emissivity at cryogenic temperatures

Mid-infrared spectral responsivity scale based on an absolute cryogenic radiometer and a tunable quantum cascade laser

Two-dimensional Keitz method for the radiant power measurement of planar ultraviolet excilamps

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