Investigation of Short Range Sensing Devices for Use in Non-Destructive Pavement Evaluation Final Report

摘要

In this project we investigate many different short-range sensors used in pavement micro and macro texture measurement. Two categories of sensors are researched: light wave-based sensors and electromagnetic (EM) wave based sensors. Light wave based sensors include laser triangulation with feed back control. EM sensors include microwave and millimeter wave macro texture detectors. The laser sensor is prototyped and lab-tested. Limited field tests have been performed. This prototype laser sensor includes laser transceivers, data acquisition systems, and associated software. Tested results show that the laser sensor is able to measure both macro and micro textures of the pavements. This report briefly discusses basic operation principles of the laser system, implementation details and software development. The EM sensors are based on microwave scattering from a rough surface. Macro texture information can be extracted from mathematics computation using data measured by the EM sensor. Several frequency band were investigated including 10 GHz band, 35 GHz band, and 90 GHz band. The tested results show that microwave and millimeter wave are very sensitive to pavement textures. Prototype EM sensors were constructed and lab tested. Theoretical discussions of the EM sensor are given in this report. Several tested cases are also presented.