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4 July 2014 Handy method to estimate uncertainty of temperature measurement by infrared thermography
Pablo Rodrigues Muniz, Ricardo de Araújo Kalid, Shirley P. Cani, Robson da Silva Magalhães
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Optical Engineering, Vol. 53, Issue 7, 074101 (July 2014). https://doi.org/10.1117/1.OE.53.7.074101
Abstract
Temperature measurement by infrared thermography is a technique that is widely used in predictive maintenance to detect faults. The uncertainty involved in measuring temperature by thermography is not only due to the imager, but also due to the measurements and estimates made by the user: emissivity of the inspected object, distance, temperature, and relative humidity of the propagation medium, temperature of objects located in the ambient, and the imager itself. This measurement uncertainty should be available for the thermographer to be able to make a more accurate diagnosis. The methods available in the literature to estimate the uncertainty of measured temperature usually require information nonaccessible to the regular thermographer. This paper proposes a method for calculating the uncertainty of temperature that requires only data available to the thermographer. This method is useful under usual conditions in predictive maintenance—short distance (7.5 to 14 μm) thermal imagers, no fog or rain, among others. It provides results similar to methods that use models that are not available or reserved by the manufacturers of imagers. The results indicate that not all sources of uncertainty are relevant in measurement uncertainty. However, the total uncertainty can be so high that it may lead to misdiagnosis.
CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.
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Pablo Rodrigues Muniz, Ricardo de Araújo Kalid, Shirley P. Cani, and Robson da Silva Magalhães "Handy method to estimate uncertainty of temperature measurement by infrared thermography," Optical Engineering 53(7), 074101 (4 July 2014). https://doi.org/10.1117/1.OE.53.7.074101
Published: 4 July 2014
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Cited by 23 scholarly publications.
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KEYWORDS
Temperature metrology
Thermography
Inspection
Atmospheric propagation
Imaging systems
Humidity
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