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Proceedings Paper

Measurement of the internal temperature of steel workpieces
Author(s): John W. Berthold III; Garry W. Roman; Robert D. Huber; James W. Wagner
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Paper 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.

Paper Details

Date Published: 1 November 1994
PDF: 5 pages
Proc. SPIE 2292, Fiber Optic and Laser Sensors XII, (1 November 1994); doi: 10.1117/12.191853
Show Author Affiliations
John W. Berthold III, Babcock & Wilcox Co. (United States)
Garry W. Roman, Babcock & Wilcox Co. (United States)
Robert D. Huber, Johns Hopkins Univ. (United States)
James W. Wagner, Johns Hopkins Univ. (United States)

Published in SPIE Proceedings Vol. 2292:
Fiber Optic and Laser Sensors XII
Ramon P. DePaula, Editor(s)

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