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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

A NON-CONTACT METHOD FOR SENSING INTERNAL TEMPERATURE DISTRIBUTIONS IN HEAT MATERIALS

Get access (open in a dialog) DOI: 10.1615/IHTC16.tpm.025307
pages 8961-8968

Abstract

A non-contact method for monitoring internal temperature distributions in solid structures during heating is presented. This method combines the advantages of the ultrasonic measurement and inverse analysis. The principle of internal temperature measurement is based on temperature dependence of the velocity of ultrasonic wave (acoustic velocity) propagating through heated materials. To determine internal temperature distribution quantitatively, an effective method using the improved inverse analysis of heat conduction calculation has been developed. Experimental setup with time-resolved measurement of nanosecond-scale, independence from the waveguide and non-contact/nondestructive detection mode is also founded based on electromagnetic ultrasonic system. To demonstrate the feasibility and reliability of this method, calibration experiment of the relationship between acoustic velocity and temperature, steady and transient heat transfer experiments with steel specimen have been made. Experimental results show that internal temperature profiles estimated by ultrasound agree well with those obtained using thermocouples installed in the steel columns. In addition, the electromagnetic ultrasonic technique that can provide a high time-response, high-precision, nondestructive and non-contact approach to measure variations of the temperature profiles in solid structures is proposed and its potentials are demonstrated. Thus, it is highly expected that the thermometry using electromagnetic ultrasound is a promising means for determining internal steady or transient temperature distributions in heat materials.