Electromagnetic-induction vehicle sensor detecting the gradient of magnetic flux

40th IEEE Conference on Vehicular Technology Pub Date : 1990-05-06 DOI:10.1109/VETEC.1990.110301

T. Fujimoto, M. Mizuno, K. Kanayama

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引用次数: 1

Abstract

A stable and highly reliable electromagnetic-induction-type vehicle sensor that takes appearance, installation, and maintenance into consideration is developed. It utilizes the electromagnetic coupling of two kinds of ferrite coils. This sensor detects the magnetic field generated by one ferrite coil with the other ferrite coil, and detects the presence of a vehicle from the minute change in the magnetic field generated when the vehicle enters. The installation of the ferrite coils is fairly simple, and this application as other types of sensors can also be considered. The basic principles, configuration of the equipment, and results of experiments on the highly sensitive directional synthesizing system which can sense the minute change in the magnetic field caused by an entering vehicle, and automatically maximize its sensitivity, are discussed. In practical tests, vehicles were satisfactorily detected even when the transmitting and receiving units were installed in the road 3.5 m apart. When installed at the roadside at intervals of one meter, a detection distance of 2.0 m was obtained. These experiments confirmed the ease of installation and the high sensitivity of this sensor.<>

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电磁感应车载传感器检测磁通梯度

研制了一种稳定、高可靠性、兼顾外观、安装和维护的电磁感应式车载传感器。它利用了两种铁氧体线圈的电磁耦合。该传感器检测一个铁氧体线圈与另一个铁氧体线圈产生的磁场，并从车辆进入时产生的磁场的微小变化中检测车辆的存在。铁氧体线圈的安装相当简单，并且这种应用作为其他类型的传感器也可以考虑。本文讨论了高灵敏度定向合成系统的基本原理、设备结构和实验结果，该系统可以感知车辆进入时引起的微小磁场变化，并自动最大化其灵敏度。在实际测试中，即使将发射单元和接收单元安装在距离3.5 m的道路上，也能令人满意地检测到车辆。每隔1米安装在路边，检测距离为2.0 m。实验结果表明，该传感器安装方便，灵敏度高

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40th IEEE Conference on Vehicular Technology

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