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Size-of-source Effect in Infrared Thermometers with Direct Reading of Temperature

  • A. ManoiEmail author
  • P. Saunders
TEMPMEKO 2016
Part of the following topical collections:
  1. TEMPMEKO 2016: Selected Papers of the 13th International Symposium on Temperature, Humidity, Moisture and Thermal Measurements in Industry and Science

Abstract

The size-of-source effect (SSE) for six infrared (IR) thermometers with direct reading of temperature was measured in this work. The alternative direct method for SSE determination, where the aperture size is fixed and the measurement distance is varied, was used in this study. The experimental equivalence between the usual and the alternative direct methods is presented. The magnitudes of the SSE for different types of IR thermometers were investigated. The maxima of the SSE were found to be up to 5 %, 8 %, and 28 % for focusable, closed-focus, and open-focus thermometers, respectively. At \(275\,^{\circ }\hbox {C}\), an SSE of 28 % corresponds to \(52\,^{\circ }\hbox {C}\), indicating the severe effect on the accuracy of this type of IR thermometer. A method to realize the calibration conditions used by the manufacturer, in terms of aperture size and measurement distance, is discussed and validated by experimental results. This study would be of benefit to users in choosing the best IR thermometer to match their work and for calibration laboratories in selecting the technique most suitable for determining the SSE.

Keywords

Infrared thermometers with direct reading of temperature Radiation thermometry Size-of-source effect 

Notes

Acknowledgements

The authors would like to thank Systronics Co., Ltd., Thailand, for supplying the flat plate blackbody used in this work.

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Copyright information

© Springer Science+Business Media New York 2017

Authors and Affiliations

  1. 1.National Institute of Metrology (Thailand)PathumthaniThailand
  2. 2.Measurement Standards Laboratory of New ZealandLower HuttNew Zealand

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