Comparison of Blackbody Sources for Low-Temperature IR Calibration

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• 作者：S. Ljungblad ; M. Holmsten ; L. E. Josefson…
• 关键词：Blackbody ; IR calibration ; Radiation thermometry
• 刊名：International Journal of Thermophysics
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：36
• 期：12
• 页码：3310-3319
• 全文大小：847 KB
• 参考文献：1.L. Knazovicka, R. Strnad, in Proceedings of Ninth International Temperature Symposium (Los Angeles), Temperature: Its Measurement and Control in Science and Industry, vol. 8, ed. by C.W. Meyer. AIP Conference Proceedings, vol. 1552 (AIP, Melville, 2013), pp. 678鈥?81
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  5. Uncertainty Budgets for Calibration of Radiation Thermometers Below the Silver Point, CCT-WG5 on Radiation Thermometry, pp. 1鈥?1 (2011). http://鈥媤ww.鈥媌ipm.鈥媜rg/鈥媤g/鈥婥CT/鈥婥CT-WG5/鈥婣llowed/鈥婱iscellaneous/鈥婰ow_鈥婽_鈥婾ncertainty_鈥婸aper_鈥媀ersion_鈥?.鈥?1.鈥媝df
  
• 作者单位：S. Ljungblad (1)
  M. Holmsten (1)
  L. E. Josefson (1)
  P. Klason (1)
  
  1. SP Technical Research Institute of Sweden, Bor氓s, Sweden
  
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Condensed Matter
  Mechanics
  Industrial Chemistry and Chemical Engineering
  Physical Chemistry
  
• 出版者：Springer Netherlands
• ISSN：1572-9567

文摘

Radiation thermometers are traditionally mostly used in high-temperature applications. They are, however, becoming more common in different applications at room temperature or below, in applications such as monitoring frozen food and evaluating heat leakage in buildings. To measure temperature accurately with a pyrometer, calibration is essential. A problem with traditional, commercially available, blackbody sources is that ice is often formed on the surface when measuring temperatures below \(0\,{}^{\circ }\hbox {C}\). This is due to the humidity of the surrounding air and, as ice does not have the same emissivity as the blackbody source, it biases the measurements. An alternative to a traditional blackbody source has been tested by SP Technical Research Institute of Sweden. The objective is to find a cost-efficient method of calibrating pyrometers by comparison at the level of accuracy required for the intended use. A disc-shaped blackbody with a surface pyramid pattern is placed in a climatic chamber with an opening for field of view of the pyrometer. The temperature of the climatic chamber is measured with two platinum resistance thermometers in the air in the vicinity of the disc. As a rule, frost will form only if the deposition surface is colder than the surrounding air, and, as this is not the case when the air of the climatic chamber is cooled, there should be no frost or ice formed on the blackbody surface. To test the disc-shaped blackbody source, a blackbody cavity immersed in a conventional stirred liquid bath was used as a reference blackbody source. Two different pyrometers were calibrated by comparison using the two different blackbody sources, and the results were compared. The results of the measurements show that the disc works as intended and is suitable as a blackbody radiation source. Keywords Blackbody IR calibration Radiation thermometry