TRB Pubsindex
Text Size:
x

« Prev Next »

Return to Results | New Search

Bookmark and Share

Title:

A LOW-COST FIBER OPTIC WEIGH-IN-MOTION SENSOR
Cover of A LOW-COST FIBER OPTIC WEIGH-IN-MOTION SENSOR

Accession Number:

00607431

Record Type:

Monograph

Abstract:

A fiber-optic WIM (weigh in motion) sensor, which offers several advantages over the piezoelectric sensor, is proposed. The system consists of a pneumatic tube filled with an incompressible fluid and embedded in a rubber pad, a diaphragm designed to convert pressure into displacement, and an optical displacement sensor. A prototype of the propsed sensor is designed, manufactured, and tested in the laboratory for different load-frequency combinations using an MTS machine. Statistical analyses of data are performed to assess the response of the sensor under varying load frequencies. A piezoelectric cable also is tested under varying load frequencies for the purpose of comaprison with the proposed sensor. The piezoelectric sensor exhibits considerable dependence on the load frequency; whereas, the response of the proposed sensor is much less frequency-dependent, and unlike the piezoelectric cable, has a waveform similar to that of the applied load. This latter property can facilitate significantly the processing of the sesnsor output signal. The linearity of response over the range of applied loads also is better than that of the piezoelectric cable. The proposed sensor is not susceptible to electromagnetic interference, is less expensive, and can be installed on the surface of the pavement, thus eliminating the need to dig the pavement.

Supplemental Notes:

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

Report/Paper Numbers:

SHRP-IDEA/UFR-90-002

Corporate Authors:

Strategic Highway Research Program

National Research Council, 2101 Constitution Avenue, NW
Washington, DC 20418 United States

Authors:

Ssafaai-Jazi, A
Ardekani, S A
Mehdikhani, M

Pagination:

62 p.

Publication Date:

1990-11

Features:

Figures; References; Tables

Subject Areas:

Design; Highways; Pavements; I22: Design of Pavements, Railways and Guideways; I23: Properties of Road Surfaces

Files:

TRIS, TRB

Created Date:

Apr 30 1991 12:00AM