00625542

Component

http://onlinepubs.trb.org...trr/1992/1355/1355-004.pdf

https://scholar.google.co...rian&publication_year=1992

The results of a comprehensive evaluation of five sensors used in pavement instrumentation are discussed. These five sensors are velocity transducer (geophone), accelerometer, linear variable differential transformer, laser optocator, and proximeter probe. The sensors were selected because of their commercial availability and their potential effectiveness in deflection measurement. The main two parameters studied were the accuracy and precision of each sensor. These parameters were studied in a laboratory environment to minimize the effects of uncertainties that may affect the results. Various impact shapes and duration were investigated. The magnitude of deflection was also varied over a wide range. In addition, factors such as cost and field-worthiness were also considered. It was found that for pavement evaluation, geophones appear to be the optimum sensors. Geophones, if used properly, will provide adequate accuracy and precision at minimal cost.

This paper appears in Transportation Research Record No. 1355, Nondestructive Structural Evaluation of Pavements. 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

01405034

English

p. 27-36

1992

Transportation Research Record

030905219X

Figures (8) ; Photos (2) ; References (3) ; Tables (7)

Accelerometers; Accuracy; Costs; Deflection; Differentials (Gears); Geophones; Pavements; Precision; Sensors; Transformers

Linear variable differential transformers

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

TRIS, TRB, ATRI

Dec 16 1993 12:00AM

• ALTERNATIVE METHOD FOR TEMPERATURE CORRECTION OF BACKCALCULATED EQUIVALENT PAVEMENT MODULI
• EFFECT OF DEPTH TO BEDROCK ON DEFLECTION BASINS OBTAINED WITH DYNAFLECT AND FALLING WEIGHT DEFLECTOMETER TESTS
• EFFECTS OF BUFFERS ON FALLING WEIGHT DEFLECTOMETER LOADINGS AND DEFLECTIONS (WITH DISCUSSION)
• ESTIMATING DAMAGE EFFECTS OF DUAL VERSUS WIDE BASE TIRES WITH MULTIDEPTH DEFLECTOMETERS
• EVALUATION OF A DUAL-LOAD NONDESTRUCTIVE TESTING SYSTEM TO BETTER DISCRIMINATE NEAR-SURFACE LAYER MODULI
• FIELD AND LABORATORY DETERMINATION OF ELASTIC PROPERTIES OF PORTLAND CEMENT CONCRETE USING SEISMIC TECHNIQUES
• MODELING OF GROUND-PENETRATING RADAR WAVE PROPAGATION IN PAVEMENT SYSTEMS
• NONLINEAR EFFECTS IN FALLING WEIGHT DEFLECTOMETER TESTS
• RADAR PAVEMENT THICKNESS EVALUATIONS FOR VARYING BASE CONDITIONS
• SIMPLIFIED, RATIONAL APPROACH TO FALLING WEIGHT DEFLECTOMETER DATA INTERPRETATION
• VARIABILITY IN ESTIMATION OF STRUCTURAL CAPACITY OF EXISTING PAVEMENTS FROM FALLING WEIGHT DEFLECTOMETER DATA