Low-Temperature Blackbodies for IR Calibrations in a Medium-Background Environment

Ogarev, S. A.; Samoylov, M. L.; Parfentyev, N. A.; Sapritsky, Victor I.

doi:10.1007/s10765-008-0490-1

Cited by 16 publications

(6 citation statements)

References 10 publications

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“…For ice and Ga blackbodies, crucibles and cavities are made of polytetrafluoroethylene (PTFE). The cavity is painted with Nextel Velvet (3M, Coating 811-21) whose spectral hemispherical emissivity is 0.960 ± 0.035 for the wavelength from 8 µm to 14 µm [13]. We used 7N purity Ga. Each blackbody is put into an aluminium tube instead of the Inconel one.…”

Section: Fixed-point Blackbodies and Furnacesmentioning

confidence: 99%

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Realization of a radiation temperature scale from 0 °C to 232 °C by a thermal infrared thermometer based on a multiple-fixed-point technique

Yoo¹,

Kim²,

Lim³

et al. 2013

Metrologia

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The radiation temperature scale for a pyroelectric detector based thermal infrared thermometer with its spectral response from 8 µm to 14 µm was realized in the temperature range from 0 • C to 232 • C by using four fixed-point blackbodies (ice, Ga, In and Sn). The Planck version of the Sakuma-Hattori equation was used to interpolate the scale between the fixed-point temperatures that are corrected by considering a size-of-source effect (SSE). The expanded uncertainties (k = 2) of the scale were estimated to be 108 mK for ice, 99 mK for Ga, 175 mK for In and 234 mK for Sn.

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Section: Fixed-point Blackbodies and Furnacesmentioning

confidence: 99%

“…For the emissivity calculation of ice and Ga blackbody cavities, the intrinsic emissivity of Nextel Velvet was taken into account [13]. The uncertainties of the radiation temperatures due to the uncertainty of the emissivity were estimated to be 15 mK for ice and 20 mK for Ga.…”

Section: Effective Emissivity Of the Blackbody Cavitymentioning

confidence: 99%

Realization of a radiation temperature scale from 0 °C to 232 °C by a thermal infrared thermometer based on a multiple-fixed-point technique

Yoo¹,

Kim²,

Lim³

et al. 2013

Metrologia

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“…Blackbody Model BB100K1 was designed in 2009 for operation at the Middle Background Calibration Facility (KRISS), on the basis of the prototype blackbody source, BB100V1 earlier designed in 2005 for NEC Toshiba Space Systems and JAXA (Japan) [7][8][9]. It features a wide aperture of 100 mm diameter that is convenient for carrying out routine calibration procedures of laboratory equipment.…”

Section: Specifications Of Bb100k1mentioning

confidence: 99%

“…While the BB100V1 blackbody cavity had been covered with Nextel Velvet 811-21 black paint [7,8], the internal surface of the BB100K1 cavity is covered by Lord …”

Section: Principle Of Bb100k1 Operationmentioning

confidence: 99%

Low-Temperature Blackbodies for Temperature Range from −60 °C to 90 °C

et al. 2011

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Low-temperature cavity-type blackbodies (BB), VTBB and BB100K1, are developed at VNIIOFI for operation as IR radiation sources of the Middle Background Calibration Facility in the temperature range from −60 • C to 90 • C, which is being constructed by KRISS for calibration of multi-spectral cameras for space applications. The VTBB model, featured by a 30 mm output aperture and hermetic housing and flange for mounting to a vacuum chamber, covers the complete temperature range under a vacuum environment (up to 10 −2 Pa), and the temperature range from 20 • C to 90 • C under open air conditions. BB100K1 has a wide aperture of 100 mm diameter, which shows stable operation in the temperature range from −60 • C to 90 • C inside a vacuum chamber, and in the temperature range from −40 • C to 90 • C in a dry-air or inert-gas environment with the usage of an extra hood with an aperture. The effective emissivity of the radiating cavities of both BB, covered with Lord Aeroglaze Z306 black paint, was calculated with the usage of STEEP3 MonteCarlo simulation software, taking the measured temperature gradients into account. The numerical calculations yield an emissivity of at least 0.9997 for the VTBB cavity, and 0.997 for the BB100K1 cavity. The radiating cavity temperature of VTBB and BB100K1 is stabilized at the level of ±0.01 • C by means of an external precise closedloop liquid thermostat (Huber Unistat 705 model). The temperature distribution along the radiating cavities and across the BB bottoms is monitored by five precision PRT thermometers and a digital multimeter equipped with a scanner card. Experimental tests using a thermal camera at KRISS demonstrated high-temperature uniformity of both radiation sources not exceeding ±50 mK over the entire temperature range, in 2545 vacuum as in a dry-air environment. The combined standard uncertainty of VTBB and BB100K1 temperature measurements accounts for about 40 mK within the range of their working temperatures.

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“…Usage of the radiation thermometers is steadily increasing for applications such as medical treatment, environmental monitoring, and meteorology near ambient temperature [1][2][3]. In general, infrared thermometers developed for the ambient-temperature applications have high target diameter-to-distance ratios, which require a large aperture blackbody for its calibration at a long distance as it is being used.…”

Section: Introductionmentioning

confidence: 99%

Construction and Characterization of a Large Aperture Blackbody for Infrared Radiometer Calibration

et al. 2011

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A large aperture blackbody (LABB) with a diameter of 1 m has been successfully constructed for calibrating radiation thermometers and infrared radiometers with a wide field of view in the temperature range between 10 • C and 90 • C. The blackbody is a 1 m long cylindro-conical cavity with a diameter of 1.1 m. Its conical bottom has an apex angle of 120 • . To achieve good temperature stability and uniformity, the cavity is integrated to a water-bath to which the pressurized water is supplied from a reservoir. To reduce the convection heat loss from the cavity to the ambient, the cavity is purged of the dried air that passes through a coiled tube immersed in the reservoir. For an uncertainty evaluation of the LABB, its temperature stability was measured by using a reference radiation thermometer (RRT) and a platinum resistance thermometer (PRT), and its radiance temperature distributions on the aperture plane were measured by using a thermal camera. Measuring the spectral emissivity of the coating material, the effective emissivity of the blackbody was calculated to be 0.9955 from 1 µm to 15 µm. The expanded uncertainty of the radiance temperature scale was evaluated based on the PRT readings, which vary from 0.3 • C to 0.5 • C (k = 2) in the temperature range. The temperature scale is validated by comparing with the RRT of which the temperature scale is realized by a multiple fixed-point calibration.

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Low-Temperature Blackbodies for IR Calibrations in a Medium-Background Environment

Cited by 16 publications

References 10 publications

Realization of a radiation temperature scale from 0 °C to 232 °C by a thermal infrared thermometer based on a multiple-fixed-point technique

Realization of a radiation temperature scale from 0 °C to 232 °C by a thermal infrared thermometer based on a multiple-fixed-point technique

Low-Temperature Blackbodies for Temperature Range from −60 °C to 90 °C

Construction and Characterization of a Large Aperture Blackbody for Infrared Radiometer Calibration

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