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Open AccessCommunication

A Low-Cost, Flexible Pressure Capacitor Sensor Using Polyurethane for Wireless Vehicle Detection

1
Faculty of Radio-Electronic Engineering, Le Quy Don Technical University, No. 236 Hoang Quoc Viet Street, Co Nhue 1 Ward, Bac Tu Liem District, Hanoi 100000, Vietnam
2
Faculty of Electrical-Electronic Engineering, University of Transport and Communications, No. 3 Cau Giay Street, Lang Thuong Ward, Dong Da District, Hanoi 100000, Vietnam
3
Faculty of Civil Engineering, University of Transport and Communications, No. 3, Cau Giay Street, Lang Thuong Ward, Dong Da District, Hanoi 100000, Vietnam
*
Author to whom correspondence should be addressed.
Polymers 2019, 11(8), 1247; https://doi.org/10.3390/polym11081247
Received: 19 June 2019 / Revised: 17 July 2019 / Accepted: 25 July 2019 / Published: 27 July 2019
(This article belongs to the Special Issue Polymer-Based Flexible Printed Electronics and Sensors)
Detection of vehicles on the road can contribute to the establishment of an intelligent transportation management system to allow smooth transportation and the reduction of road accidents. Thus far, an efficient and low-cost polymer flexible pressure sensor for vehicle detection is lacking. This paper presents a flexible sensor for vehicle sensing and demonstrates a wireless system for monitoring vehicles on the road. A vehicle sensor was fabricated by sandwiching a polyurethane material between aluminum top/bottom electrodes. The sensing mechanism was based on changes in capacitance due to variation in the distance between the two electrodes at an applied external pressure. A clear response against a pressure load of 0.65 Mpa was observed, which is the same pressure as that of the car tire area in contact with the road. Significantly, the sensor was easy to embed on the road line due to its mechanical flexibility and large size. A field test was carried out by embedding the sensor on the road and crossing the sensor with a car. Moreover, the signal displayed on the tablet indicated that the sensing system can be used for wireless detection of the axle, speed, or weight of the vehicle on the road. The findings suggest that the flexible pressure sensor is a promising tool for use as a low-cost vehicle detector in future intelligent transportation management. View Full-Text
Keywords: flexible pressure sensor; polyurethane polymer; wireless data acquisition (DAQ); non-intrusive monitoring; vehicle detection flexible pressure sensor; polyurethane polymer; wireless data acquisition (DAQ); non-intrusive monitoring; vehicle detection
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MDPI and ACS Style

Khong Duc, C.; Hoang, V.-P.; Tien Nguyen, D.; Thanh Dao, T. A Low-Cost, Flexible Pressure Capacitor Sensor Using Polyurethane for Wireless Vehicle Detection. Polymers 2019, 11, 1247.

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