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Title:

AUTOMATION OF MONITORING OF GEOTECHNICAL INSTRUMENTATION

Accession Number:

00468613

Record Type:

Component

Availability:

Find a library where document is available


Order URL: http://worldcat.org/isbn/0309044723

Abstract:

Inexpensive, low-powered, portable dataloggers directly compatible with many sensors commonly used in slope stability and soil mechanics work provide new measurement opportunities by reducing logistic complexity and cost. Pressure, force, and position sensors employing strain gauges, vibrating-wire transducers, or potentiometers are used to obtain soil pore pressures, slope inclination, movement, and strain. Sensors for general meteorological parameters and soil moisture are also accommodated. Accurate strain gauge measurements require the datalogger to have low input noise, high resolution, and precision switched bridge excitation voltages. Vibrating-wire transducers are measured either by plucking the transducer and period averaging the decaying transient or by using a continuously excited sensor and counting the frequency. Programmable dataloggers process measurements on site, reducing data storage requirements and allowing logic decisions based on measured values such as recording of data more frequently during significant events (conditional recording) and setting alarms or controls. Real-time communication to a computer uses telephone, radio, or satellite links. On-site data storage uses solid-state memory modules or cassette tapes. The standard environmental operating range of the dataloggers if -25 deg C to +50 deg C, with -50 deg C to +80 deg C available through special testing.

Supplemental Notes:

Publication of this paper sponsored by Committee on Soils and Rock Instrumentation. 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 Title:

Geotechnology

Monograph Accession #:

01418086

Authors:

Hinckley, Alan L
Tanner, Bertrand D
Campbell, Eric C

Pagination:

pp 26-29

Publication Date:

1987

Serial:

Transportation Research Record

Issue Number: 1119
Publisher: Transportation Research Board
ISSN: 0361-1981

ISBN:

0309044723

Media Type:

Print

Features:

Figures (1) ; Tables (1)

Uncontrolled Terms:

Dataloggers; Site investigation

Subject Areas:

Geotechnology; Highways; I42: Soil Mechanics

Files:

TRIS, TRB, ATRI

Created Date:

May 31 1988 12:00AM

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