WEIGHT-IN-MOTION (WIM) MEASUREMENTS BY FIBER OPTIC SENSOR: PROBLEMS AND SOLUTIONS

In the present study the authors are discussing the possibility of fibre optic sensor application for weighing road vehicles in motion (WIM – weight-in-motion). The various factors affecting the accuracy of fibre optic sensors measurement are considered to be: features of the installation in the roadway, the nonlinearity and inertia of the sensor, the thermal effect, the inertial force of the vibrating vehicle and the extremely short time of the load standing on the sensor. The examples of the record signals, transferring to a fibre optic sensor, are made. The analysis of the causes of measurement error and possible ways to improve the accuracy of weighing for the solution of the pre-selection of road vehicles in motion upon the dynamic load on the axis is submitted.