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1 November 1994 Measurement of the internal temperature of steel workpieces
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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.
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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);

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