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Sensors 2017, 17(5), 1157;

Infrared Thermography Sensor for Temperature and Speed Measurement of Moving Material

Department of Computer Science and Engineering, University of Oviedo, Campus de Viesques, 33204 Gijón, Spain
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 7 April 2017 / Revised: 11 May 2017 / Accepted: 17 May 2017 / Published: 18 May 2017
(This article belongs to the Special Issue Intelligent Sensing Technologies for Nondestructive Evaluation)
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Infrared thermography offers significant advantages in monitoring the temperature of objects over time, but crucial aspects need to be addressed. Movements between the infrared camera and the inspected material seriously affect the accuracy of the calculated temperature. These movements can be the consequence of solid objects that are moved, molten metal poured, material on a conveyor belt, or just vibrations. This work proposes a solution for monitoring the temperature of material in these scenarios. In this work both real movements and vibrations are treated equally, proposing a unified solution for both problems. The three key steps of the proposed procedure are image rectification, motion estimation and motion compensation. Image rectification calculates a front-parallel projection of the image that simplifies the estimation and compensation of the movement. Motion estimation describes the movement using a mathematical model, and estimates the coefficients using robust methods adapted to infrared images. Motion is finally compensated for in order to produce the correct temperature time history of the monitored material regardless of the movement. The result is a robust sensor for temperature of moving material that can also be used to measure the speed of the material. Different experiments are carried out to validate the proposed method in laboratory and real environments. Results show excellent performance. View Full-Text
Keywords: temperature monitoring sensor; motion compensation; infrared thermography temperature monitoring sensor; motion compensation; infrared thermography

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Usamentiaga, R.; García, D.F. Infrared Thermography Sensor for Temperature and Speed Measurement of Moving Material. Sensors 2017, 17, 1157.

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