Asphalt Pavement Traffic Information Monitoring Based on Optical Frequency Domain Reflectometer

To meet the demand for intelligent traffic infrastructure, distributed optical fiber sensing, a new sensing technology, has been gradually applied to asphalt pavement health monitoring. This paper used the optical frequency domain reflectometer (OFDR) to collect the data of distributed optical fiber sensors embedded in the test road. By processing and mining the measured data, a traffic information monitoring method based on a peak recognition algorithm was proposed. Compared with the actual traffic information, the results show that the distributed optical fiber sensor can accurately monitor the vehicle type outside the car and realize the identification of vehicle flow, vehicle speed, and load position with high accuracy.

I. Introduction

Road traffic information monitoring methods can be divided into the roadside type [1] and the internal type [2]. Road test monitoring includes cameras, radar, infrared systems [3]– [5], and so on, with the advantages of easy installation, and low cost. But it is vulnerable to weather and human interference, and it is impossible to obtain information about vehicle weight and the internal response of the road structure. Internal monitoring is to monitor the response of the road structure under the influence of vehicle load and the environment by embedding sensors inside the road structure.