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Title:

MICROPROCESSOR-BASED NONCONTACT DISTANCE MEASURING CONTROL SYSTEM

Accession Number:

00450725

Record Type:

Component

Availability:

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Order URL: http://worldcat.org/isbn/030903809X

Abstract:

A microprocessor-based noncontact ranging system is discussed, which, along with a computer-based videographics system, constitutes a noncontact texture profiling system developed at the Pennsylvania Transportation Institute. Consisting of a 6502-based single board computer and a Polaroid ultrasonic circuit board, the ranging system is used to monitor the displacement between a traveling test vehicle and the road surface. The texture measurement is performed by the videographic system, which is capable of acquiring data only when it is within a range of % 1.2 mm from the pavement. Because the system is mounted in a moving vehicle, it is continuously moving up and down relative to the pavement and, consequently, a ranging device is needed to trigger the data acquisition only when the system is in range. Because the system is to run at highway speeds, the ranging system needs to operate at a sampling rate of 40 per second with a resolution of 0.3 mm or better. The final system achieved a rate of 60 samples per second with a resolution of 0.17 mm. A high resolution of the videographic system is achieved because the ranging system eliminates the need for a large depth of field. In addition, the ranging system is capable of data processing, self-calibration, and controlling, and thus has the potential for other applications such as road roughness measurement, liquid level sensing, and any general noncontact displacement measurement.

Supplemental Notes:

Publication of this paper sponsored by Committee on Surface Properties-Vehicle Interaction. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved

Monograph Accession #:

00451600

Report/Paper Numbers:

HS-039 027

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Wang, Jiunnjyh
Wambold, J C
Henry, J J

Editors:

Withers, Julia

Pagination:

pp 42-48

Publication Date:

1984

Serial:

Transportation Research Record

Issue Number: 1000
Publisher: Transportation Research Board
ISSN: 0361-1981

ISBN:

030903809X

Media Type:

Print

Features:

Figures (11) ; References (4)

Subject Areas:

Highways; Pavements; Safety and Human Factors; I23: Properties of Road Surfaces

Files:

HSL, TRIS, TRB

Created Date:

Dec 31 1985 12:00AM

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