| 摘要 |
<p>An external trespass sensing system on the basis of a net constructed by using coaxial cables to form a physical barrier and more particularly comprises an intruder's climbing detecting means which generate an abnormal signal caused to change in resistance and to protect from the intruder's climbing up the anchor postst, a ground intrusion detecting means which generate an abnormal signal caused to change in resistance and to protect from the intruder's ground intrusion, an under ground intrusion detecting means which generate an abnormal signal caused to change in resistance and to protect from the intruder's under ground intrusion, and a control means for receiving the abnormal signals from said means and generating an alarm.</p> |
