| 摘要 |
PROBLEM TO BE SOLVED: To detect movable body with a low-cost facilities, regardless of running speed of the movable body. SOLUTION: A ultrasound transmitting wheel 3 which transmits ultrasonic to the rail 6 of a vehicle 1 is loaded on the side of the vehicle 1, and a ultrasonic transducer 7 is attached to a certain location of the rail 6. When the vehicle 1 passes through at the point where the ultrasonic transducer 7 is attached, ultrasonic transmitted from the ultrasound transmitting wheel 3 is received by the ultrasonic transducer 7, and its level of the receiving output is detected by a level detection circuit 13 of an on-site device 10, and the vehicle is determined as passed by a processing device 8 based on an output of the level detection circuit 13 when it is above a certain level. |
