| 摘要 |
PURPOSE:To suitably grasp a mobile body, by installing two detection lines bent in rectangular shape in a vertical plane with a shift with each other in parallel with ground, applying a high frequency voltage via a capacitor, and detecting the phase difference of a detection signal picked up from one end of the detection lines. CONSTITUTION:Two detection lines A1, A2 bent in rectangular shape in a vertical plane are installed in parallel with ground G with a shift of almost 1/4 period and a high frequency voltage (e) is fed via a capacitor 2. Outputs Vc1, Vc2 via an amplifier 4, detector 5 and wave forming circut 6 connected to ends a1, a2 of the lines A1, A2 are fed to a mobile direction detecting circuit 7, where the phase of both signals is compared. The direction of movement of a mobile body M which moves in parallel with the lines A1, A2, toward X1, X2, is detected by the phase difference. Thus, the mobile body can suitably be grasped. |
