Abstract
The number of components of a thermographic temperature measurement uncertainty budget and their ultimate contribution depend on the conditions in which the measurement is performed. The acquired data determine the accuracy with which the uncertainty component is estimated. Unfortunately, when some factors have to be taken into account, it is difficult to determine the value of the uncertainty component caused by the occurrence of this factor. In the case of a thermographic temperature measurement, such a factor is the lack of sharpness of the registered thermogram. This problem intensifies when an additional macro lens must be used. Therefore, it is decided to commence research to prepare an uncertainty budget of thermographic measurement with an additional macro lens based on the B method described in EA-4/02 (European Accreditation publications). As a result, the contribution of factors in the uncertainty budget of thermographic measurement with additional macro lens and the value of expanded uncertainty were obtained.
Highlights
Sensors 2021, 21, 4013. https://When performing a thermographic temperature measurement, the indication of the thermal imaging camera is influenced by a number of factors [1]
These values, if correctly determined, make it possible to minimize their effect on θt. It is possible by selecting proper coefficients in the thermographic camera software [15]. Another factor to be taken into account in the uncertainty budget of the thermographic temperature measurement is the lack of sharpness of the registered thermogram [16]
The measurement system had to be designed in such a way as to enable two options to change the sharpness of the registered thermogram: by Sensors 2021, 21, 4013 changing the distance between the lens and the observed object d and by changing the focus adjustment ring angle placed on the thermographic camera lens α
Summary
Sensors 2021, 21, 4013. https://When performing a thermographic temperature measurement, the indication of the thermal imaging camera is influenced by a number of factors [1]. The most important factors that have an effect on the temperature read-out value, and that should be taken into account in the uncertainty budget are, emission factor value [4], reflected temperature [5], distance between the camera lens and the object under observation [6], ambient temperature [7], external optical system temperature [8], transmission of the external optical system [9,10], and relative humidity [11] These are the factors whose contribution to the uncertainty budget can be determined from measurements or available literature. Another factor to be taken into account in the uncertainty budget of the thermographic temperature measurement is the lack of sharpness of the registered thermogram [16]
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