Measurement of the internal temperature of steel workpieces

John W. Berthold III; Garry W. Roman; Robert D. Huber; James W. Wagner

doi:10.1117/12.191853

1 November 1994 Measurement of the internal temperature of steel workpieces

John W. Berthold III, Garry W. Roman, Robert D. Huber, James W. Wagner

Proceedings Volume 2292, Fiber Optic and Laser Sensors XII; (1994) https://doi.org/10.1117/12.191853
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

Abstract

We have completed feasibility tests on a system to measure the internal temperature of hot steel workpieces. The system is based on laser generation of ultrasound and consists of a high power pulsed laser which shines on one surface of the workpiece. Each high power laser pulse ablates a small amount of material and the reaction forces create a longitudinal ultrasonic wave in the steel. A separate laser interferometer measures the arrival of the ultrasonic pulse at the opposite surface of the workpiece. Measurement of the time-of-flight of the ultrasonic pulse enables the velocity of sound to be computed. The velocity of sound is a known function of temperature in steel materials, and so the average temperature of the steel along the path of the ultrasonic wave can be determined. This system has several applications in the heavy metals industry, and feasibility tests were conducted on several different steel alloys. Laser generation and detection of ultrasound was demonstrated at temperatures above 1250 degree(s)C. Details of the measurement system will be described and results of the feasibility tests will be presented.

Citation Download Citation

John W. Berthold III, Garry W. Roman, Robert D. Huber, and James W. Wagner "Measurement of the internal temperature of steel workpieces", Proc. SPIE 2292, Fiber Optic and Laser Sensors XII, (1 November 1994); https://doi.org/10.1117/12.191853

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