Precision Core Temperature Measurement of Metals Using an Ultrasonic Phase-Shift Method

Temperature measurement is one of the most important aspects of manufacturing. There have been many temperature measuring techniques applied for obtaining workpiece temperature in different types of manufacturing processes. The main limitations of conventional sensors have been the inability to indi...

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Bibliographic Details
Published in:Journal of Manufacturing and Materials Processing 2019-09, Vol.3 (3), p.80
Main Authors: Olabode, Olaide F., Fletcher, Simon, Longstaff, Andrew P., Mian, Naeem S.
Format: Article
Language:English
Subjects:
Accuracy
core temperature measurement
Heat
Machining
Manufacturing
Measurement techniques
Metals
Methods
Phase shift
phase-shift method
Propagation
Simulation
Sound
Temperature
Temperature dependence
Temperature measurement
ultrasonic thermometry
Velocity
Workpieces
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Summary:Temperature measurement is one of the most important aspects of manufacturing. There have been many temperature measuring techniques applied for obtaining workpiece temperature in different types of manufacturing processes. The main limitations of conventional sensors have been the inability to indicate the core temperature of workpieces and the low accuracy that may result due to the harsh nature of some manufacturing environments. The speed of sound is dependent on the temperature of the material through which it passes. This relationship can be used to obtain the temperature of the material provided that the speed of sound can be reliably obtained. This paper investigates the feasibility of creating a cost-effective solution suitable for precision applications that require the ability to resolve a better than 0.5 °C change in temperature with ±1 °C accuracy. To achieve these, simulations were performed in MATLAB using the k-wave toolbox to determine the most effective method. Based upon the simulation results, experiments were conducted using ultrasonic phase-shift method on a steel sample (type EN24T). The results show that the method gives reliable and repeatable readings. Based on the results from this paper, the same setup will be used in future work in the machining environment to determine the effect of the harsh environment on the phase-shift ultrasonic thermometry, in order to create a novel technique for in-process temperature measurement in subtractive manufacturing processes.
ISSN:2504-4494
2504-4494
DOI:10.3390/jmmp3030080