| 摘要 |
A pipe type detection device for detecting intrusion comprises: a plurality of oscillating coils separately wound around a plurality of metal rods which are vertically spaced apart from the ground by a predetermined distance; a plurality of oscillating units separately connected to the oscillating coils to oscillate set detection frequencies; and an intrusion determination unit to determine intrusion depending on the height of a detected object in determining the intrusion by detecting a change in a plurality of oscillating frequencies outputted from the oscillating units. |
