Ultrasonic temperature determination during industrial materials processing

Chen, T.-F.; Nguyen, K. T.; Franc¸a, D. R.; Jen, C.-K.; Ihara, I.; Tatiboue¨t, J.
May 2000
AIP Conference Proceedings;2000, Vol. 509 Issue 1, p2021
Academic Journal
Two technologies for measuring temperature with ultrasound during the processing of materials are presented. Both methods use clad buffer rods. These approaches present the great interest of being able of providing, in addition to the temperature measurement, the simultaneous monitoring of other parameters of the material being processed such as its elastic properties. The first method uses clad buffer rods with two steps machined at the probing end contacting the material being processed. The ultrasonic time delays in the two regions which are between the rod end and the first step, and between the first and the second step can be calibrated versus temperature variation. The measurement of these time delays during material processing, associated with a conduction heat transfer model provide an accurate temperature at the probing end. For molten zinc processing at temperature ranging between 350 and 700 °C, good agreement was obtained between the temperatures measured ultrasonically and those measured by a thermocouple. The second method is applied at the nozzle of a polymer injection-molding machine. The temperature measurement relies on the relationship between the pressure, temperature and velocity (PVT) of a specific polymer. Two clad buffer rods arranged in a transmission geometry are used to measure the averaged ultrasonic velocity in the molten polymer flowing within the nozzle. A reflection geometry using only one clad buffer rod can also be employed. The pressure is measured by using both a commercial pressure sensor and a clad buffer rod. The measured velocity and the pressure lead to the measurement of the average temperature in the molten polymer. For a polycarbonate, assuming the uncertainty in the measurement of pressure and ultrasonic velocity to be 1 MPa and 1 m/s, respectively, the temperature measurement uncertainty is then about 3 °C with a 0.5 °C. © 2000 American Institute of Physics.


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