Optical Distance Meter Using a Pulsed Laser Diode and Fast Avalanche Photo Diodes for Measurements of Molten Steel Levels-Reference-Cited by-同舟云学术

Optical Distance Meter Using a Pulsed Laser Diode and Fast Avalanche Photo Diodes for Measurements of Molten Steel Levels

Published:1996-12-01 Issue:4 Volume:118 Page:800-803
ISSN:0022-0434
Container-title:Journal of Dynamic Systems, Measurement, and Control
language:en
Short-container-title:

Author:

Araki Tsutomu¹,Yoshida Haruhiko²

Affiliation:

1. Department of Mechanical Engineering, University of Tokushima, Tokushima 770, Japan

2. Technical Research Institutes, Hitachi Zosen Corp., Funamachi, Taisho, Osaka 551, Japan

Abstract

An optical distance meter with a wide dynamic range, is proposed for measuring the level of molten steel in a steel mold. The meter operates by measuring the flight time of a short optical pulse that is propagated between the light source and the target. A pulsed laser diode with a fast rise time is utilized as a light source, and two avalanche photo-diodes are used as detectors. The optical distance meter performs at a measurement range and a standard deviation of the measurement error of 1 m and 1 mm for the black paper target, respectively. To test its reliability, the distance meter is used to monitor the level of molten steel during a continuous casting process. The results obtained were compared with those obtained using an eddy current sensor and a γ-ray sensor. The measurement range of the optical method is ten times those attained using other two sensors. Continuous monitoring of the steel level can be done from the initiation of the casting process with the proposed distance meter.

Publisher

ASME International

Subject

Computer Science Applications,Mechanical Engineering,Instrumentation,Information Systems,Control and Systems Engineering

Link

http://asmedigitalcollection.asme.org/dynamicsystems/article-pdf/118/4/800/5545795/800_1.pdf

Reference5 articles.

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2. Araki T. , 1995, “An Optical Distance Meter Developed Using a Short Pulse Width Laser Diode and a Fast Avalanche Photo-diode,” Rev. Sci. Instrum., Vol. 66, pp. 43–47.

3. Schunke B. , GowersC. W., HirschK., and NielsenP., 1993, “A Laser Diode as a Light Source for Calibrating the Time Base of a Streak Camera,” Rev. Sci. Instrum., Vol. 64, pp. 3338–3339.

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