2021 年 29 巻 2 号 p. 427-433
Sensors that detect vehicles are widely used around us. Among them, the electromagnetic induction type sensor has extremely excellent performance among the sensors that detect the vehicle by the non-contact method. However, there was no paper that organized how to use the output voltage characteristics of the electromagnetic induction sensor. Therefore, the authors focused on an electromagnetic induction sensor suitable for vehicle detection, and proposed an electromagnetic induction sensor using three coils. Using the output voltage characteristics of this sensor, we investigated the improvement of vehicle type discrimination accuracy and traveling direction detection accuracy. By analysis and actual measurement, it can be expected to detect the traveling direction of the vehicle and the dimensional difference of the vehicle from the output voltage characteristics of the sensor at a lift-off of 400 mm.
