5 May 2017 Direct comparison of two pyrometers and a low-cost thermographic camera for time resolved LWIR temperature measurements
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Abstract
Contactless temperature sensing is state of the art and essential part of countless applications in the field of process control and automation. This contribution presents the case of a nondestructive thickness measurement method for polymeric coatings on concrete ground. Two pyrometers and a low-cost infrared camera were taken into account. The particular measurement results were compared with those of a more sophisticated infrared camera. It was found that the low-cost infrared camera has a lower noise level than the pyrometers, even for a single pixel. The opportunity to average over a large number of pixels and to establish a bias correction enables a further noise reduction by almost factor of 10. Furthermore, the temporal resolution of the infrared camera was investigated by means of a well-defined thermal oscillation. It could be demonstrated that the averaged time stamps are correct and the requirement of a minimum framerate of 50 Hz is met. Finally, the temperature transient on a polymer coated concrete block during and after a 10 s heating period was recorded with a pyrometer and the infrared camera. This experiment confirmed the suitability of the camera for the intended measurement method.
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Rainer Krankenhagen, Rainer Krankenhagen, Simon J. Altenburg, Simon J. Altenburg, } "Direct comparison of two pyrometers and a low-cost thermographic camera for time resolved LWIR temperature measurements", Proc. SPIE 10214, Thermosense: Thermal Infrared Applications XXXIX, 1021414 (5 May 2017); doi: 10.1117/12.2261074; https://doi.org/10.1117/12.2261074
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