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ABSTRACT
Thermography, mostly infrared, is a quantitative and spatio-temporal cartographic technique of thermal radiations or luminances from the scene observed by the thermal imaging camera. The emission of the black body, the composition of the radiometer and its equation, the elaboration of the calibration curve and the radioactive properties of materials are described. The radiometric measurement equation involving a set of influence quantities and used for transcription in temperature is then dealt with. To conclude, the sources of measurement uncertainties are listed.
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Dominique PAJANI: Engineer, École Centrale de Lyon - President of the Institut de la Thermographie association - Expert to the Versailles Court of Appeal
INTRODUCTION
Infrared thermography is a special case of thermography, even if it is the best-known and most widespread. Originally (1970), the term "infrared" was added to "thermography" to distinguish it from contact thermography techniques. Here, we'll focus on a broader spectrum of radiation.
We'll focus on the differences between simple thermal imaging and measurement thermography, the latter being the focus of this article.
Until 1995, presenting thermal imaging cameras as "black boxes" to be characterized as such was a justified approach, given that they belonged to a single technological family. This avoided exposing peculiarities that had no primary impact on the equipment's characteristics. In a second article, we look at recent radiation detector technologies and their implications.
We will do our utmost to comply with the standards for infrared thermography (NF A 09-400, NF A 09-420 and NF A 09-421).
We will be using the VIM – vocabulaire international de métrologie (JCGM 200:2012) and the radiation standard (NF ISO 80000-7).
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KEYWORDS
Thermal camera | Radiometer | thermal radiation | Radiometric equation | transcription in temperature
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Standards and norms
- Non-destructive testing – Infrared thermography – Vocabulary related to equipment characterization. - NF A09-400 - Décembre 1991
- Non-destructive testing – Infrared thermography – Characterization of equipment. - NF A09-420 - Avril 1993
- Non-destructive testing – Infrared thermography – Equipment characterization methods. - NF A09-421 - Avril 1993
- Quantities and units – Part 7: Light. - NF ISO 80000-7...
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