00668948

Component

http://onlinepubs.trb.org...trr/1994/1432/1432-010.pdf

https://scholar.google.co...+Lai&publication_year=1994

Low-cost fiber optic sensors capable of measuring loads and pressures, including pore water pressures, have been developed. These sensors employ microbend fiber optic technology and are capable of measuring pressures from 0 to 700 kPa (100 psi). They are relatively inexpensive and give reliable and repeatable results. A calibration setup was developed to ensure reliable data acquisition during load or pressure testing of microbend sensors. Sensor development and operation, along with their sensitivities, are described. The preferred configuration could be placed in the soil and used for the in situ monitoring of pore water pressures and total stresses once the development is completed.

This paper appears in Transportation Research Record No. 1432, Innovations in Instrumentation and Data Acquisition Systems. 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

01401243

English

p. 76-85

1994-10

Transportation Research Record

0309055148

Figures (11) ; References (8) ; Tables (1)

Calibration; Fiber optics; Loads; Pore water pressures; Pressure; Reliability; Sensitivity; Sensors

Fiber optic sensors; Low cost; Repeatability

Geotechnology; Highways; I42: Soil Mechanics

TRIS, TRB

Nov 8 1994 12:00AM

• AUTOMATIC STRESS PATH CONTROL SYSTEM FOR HOLLOW CYLINDER TORSIONAL TESTING OF SOILS
• CONCURRENT TUTORIALS AND APPLICATIONS
• DATA ACQUISITION SYSTEM AND COMPUTER CONTROL OF CALIBRATION CHAMBER TESTS ON SAND
• DESIGN AND DATA ACQUISITION FOR THERMAL CONDUCTIVITY MATRIC SUCTION SENSORS
• DEVELOPMENT OF MINIATURE EQUIPMENT FOR A SMALL GEOTECHNICAL CENTRIFUGE
• INSTRUMENTATION AND DATA ACQUISITION FOR FIELD SUCTION MEASUREMENT
• INSTRUMENTATION FOR REMOTE AND CONTINUOUS MONITORING OF STRUCTURE CONDITIONS
• INSTRUMENTATION OF A LANDFILL COVER TO MEASURE DEPTH OF FROST PENETRATION
• LONG-TERM PAVEMENT PERFORMANCE SEASONAL MONITORING PROGRAM: INSTRUMENTATION SELECTION AND INSTALLATION
• STATIC AND DYNAMIC MEASUREMENTS USING EMBEDDED EARTH PRESSURE CELLS
• USE OF AIR-REGULATING VALVES IN GEOTECHNICAL LABORATORY TESTING
• USING DEVICE-SPECIFIC DATA ACQUISITION FOR AUTOMATED LABORATORY TESTING