%A %T Detection System for Ultrahigh Vehicle Based on Laser Sensor %0 Journal Article %D 2011 %J Science & Technology Review %R 10.3981/j.issn.1000-7857.2011.08.010 %P 63-66 %V 29 %N 11-08 %U {http://www.kjdb.org/CN/abstract/article_3283.shtml} %8 2011-03-18 %X A detection system for ultrahigh vehicle is designed based on laser sensor. A laser screen is formed through emission sensors and receiving sensors, and the exact height of ultrahigh parts can be measured by judging whether the signals of the sensors are blocked. Optical modulation and optical demodulation are adopted for the design of hardware circuit in view of the interference of sunlight and strong light, to turn the laser signals into discrete signals. In this way, the problems of the interference of continuous light signals in nature can be solved effectively. In the software design, the Freescale MC9S12DG128 singlechip is used to control the emission signal and process the received signal, with a simple but very efficient program. Laser sensors are used in this detection system due to the strong anti-interference ability and the high accuracy to achieve dynamic measurement of vehicle height. The vehicle speed can be as high as 40km/h, and the system not only enjoys high measurement accuracy and high detection efficiency, but also can measure the height of hollow objects. In the actual detection experiment, the accuracy of the system can reach 5cm and, the detection range can be from 4m to 6m. The system is widely used in urban roads and highways to prevent large trucks from blocking in bridges or colliding with bridges.