A black-body source of radiation covering a wavelength range from the ultraviolet to the infrared

Lapworth, K. C.; Quinn, T J; Allnutt, L A

doi:10.1088/0022-3735/3/2/308

Cited by 20 publications

(4 citation statements)

References 7 publications

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“…Low temperature range, below ca. 3000 K The majority of the requirements mentioned above for matching the properties of calibration light sources and shock pyrometry experiments can be easily satisfied when the measured temperatures do not exceed approximately 2300 K. Many commercially available, compact blackbody simulators operate below 1800 K. 12,13,41 Some experimental models were reported that operate up to 3300 K. [42][43][44] However, reasonably stable and well-characterized blackbodies operating above 3000 K are quite bulky and require water cooling and inert gas purging of window-covered hot cavities. 45,46 We found only two vendors of commercial blackbody simulators operating above 2300 K. 47,48 Each of these devices weighs approximately 182 kg and has a volume of 0.7-0.8 m 3 .…”

Section: Review Of Calibration Sources For Shock Temperature Pyromentioning

confidence: 99%

Contributed Review: Absolute spectral radiance calibration of fiber-optic shock-temperature pyrometers using a coiled-coil irradiance standard lamp

Fat’yanov

Asimow

2015

Review of Scientific Instruments

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Development of a fast fiber-optic two-color pyrometer for the temperature measurement of surfaces with varying emissivities Rev. Sci. Instrum. 72, 3366 (2001); 10.1063/1.1384448 This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitationnew. We describe an accurate and precise calibration procedure for multichannel optical pyrometers such as the 6-channel, 3-ns temporal resolution instrument used in the Caltech experimental geophysics laboratory. We begin with a review of calibration sources for shock temperatures in the 3000-30 000 K range. High-power, coiled tungsten halogen standards of spectral irradiance appear to be the only practical alternative to NIST-traceable tungsten ribbon lamps, which are no longer available with large enough calibrated area. However, non-uniform radiance complicates the use of such coiled lamps for reliable and reproducible calibration of pyrometers that employ imaging or relay optics. Careful analysis of documented methods of shock pyrometer calibration to coiled irradiance standard lamps shows that only one technique, not directly applicable in our case, is free of major radiometric errors. We provide a detailed description of the modified Caltech pyrometer instrument and a procedure for its absolute spectral radiance calibration, accurate to ±5%. We employ a designated central area of a 0.7× demagnified image of a coiled-coil tungsten halogen lamp filament, cross-calibrated against a NIST-traceable tungsten ribbon lamp. We give the results of the cross-calibration along with descriptions of the optical arrangement, data acquisition, and processing. We describe a procedure to characterize the difference between the static and dynamic response of amplified photodetectors, allowing time-dependent photodiode correction factors for spectral radiance histories from shock experiments. We validate correct operation of the modified Caltech pyrometer with actual shock temperature experiments on single-crystal NaCl and MgO and obtain very good agreement with the literature data for these substances. We conclude with a summary of the most essential requirements for error-free calibration of a fiber-optic shock-temperature pyrometer using a high-power coiled tungsten halogen irradiance standard lamp. C 2015 AIP Publishing LLC.[http://dx

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Section: Review Of Calibration Sources For Shock Temperature Pyromentioning

confidence: 99%

Contributed Review: Absolute spectral radiance calibration of fiber-optic shock-temperature pyrometers using a coiled-coil irradiance standard lamp

Fat’yanov

Asimow

2015

Review of Scientific Instruments

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“…The experimental arrangement is shown in figure 1. The background source has been described by Lapworth et al (1970). The source is provided by electrically heating a graphite tube in argon at a little above 1 atm pressure.…”

Section: Temperature Measurementsmentioning

confidence: 99%

“…Uncertainty in emissivity of the background source. According to Lapworth et al (1970) the uncertainty in emissivity arising from uncertainty in the specular or diffuse nature of reflections inside the black-body cavity leads to an uncertainty of less than ? 5 K in the effective black-body temperature at the wavelength used.…”

Section: Pyrometer Readingsmentioning

confidence: 99%

Temperature measurements in shock-heated carbon monoxide by an infrared technique

Lapworth¹,

Allnutt²,

Pendlebury³

1971

J. Phys. D: Appl. Phys.

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The temperature of shock-heated carbon monoxide has been measured by an emission-absorption method using the infrared radiation of the fundamental band centred at 4·7 μm. Temperatures in the range 600 to 4000 K were measured. These limits were determined by the shock tube rather than the technique. Small discrepancies between the measured and theoretical temperatures are adequately accounted for by shock-tube effects.

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“…Blackbody systems are generally used to calibrate infrared radiation measurement devices, such as infrared thermal imaging sensors or infrared cameras, or to calibrate thermal image information. A blackbody system is defined as a precise radiant heat generator with an emissivity close to 1, and it is used to calibrate broadband infrared radiant heat sensors [ 20 ]. Emissivity is a key parameter that represents the ability of an object to emit infrared energy.…”

Section: Introductionmentioning

confidence: 99%

Design, Fabrication, and Performance Evaluation of Portable and Large-Area Blackbody System

Bae

Choi

Hong

et al. 2020

Sensors

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In this study, a portable and large-area blackbody system was developed following a series of processes including design, computational analysis, fabrication, and experimental analysis and evaluation. The blackbody system was designed to be lightweight (5 kg), and its temperature could exceed the ambient temperature by up to 15 °C under operation. A carbon-fiber-based heat source was used to achieve a uniform temperature distribution. A heat shield fabricated from an insulation material was embedded at the opposite side of the heating element to minimize heat loss. A prototype of the blackbody system was fabricated based on the design and transient coupled electro-thermal simulation results. The operation performance of this system, such as the thermal response, signal transfer function, and noise equivalent temperature difference, was evaluated by employing an infrared imaging system. In addition, emissivity was measured during operation. The results of this study show that the developed portable and large-area blackbody system can be expected to serve as a reliable reference source for the calibration of aerial infrared images for the application of aerial infrared techniques to remote sensing.

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A black-body source of radiation covering a wavelength range from the ultraviolet to the infrared

Cited by 20 publications

References 7 publications

Contributed Review: Absolute spectral radiance calibration of fiber-optic shock-temperature pyrometers using a coiled-coil irradiance standard lamp

Contributed Review: Absolute spectral radiance calibration of fiber-optic shock-temperature pyrometers using a coiled-coil irradiance standard lamp

Temperature measurements in shock-heated carbon monoxide by an infrared technique

Design, Fabrication, and Performance Evaluation of Portable and Large-Area Blackbody System

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