公开(公告)号：US3836960A

公开(公告)日：1974-09-17

申请号：US2444270

申请日：1970-03-12

Applicant: GEN DYNAMICS CORP

Inventor： GEHMAN J ,  RAVENIS J

IPC: G01S13/04 ,  G01S9/02

CPC classification number: G01S13/04

Abstract: A sensor system suitable for use as an intrusion detector or metal detector is described. The system transmits CW signals in the VHF or UHF frequency bands and receives modulation components of these signals which are being re-radiated from metal to metal bodies that are in contact with each other in or on the object to be detected. When the amplitude of these re-radiated modulation components exceeds a predetermined threshold, the presence of the object is indicated.

Abstract translation: 描述适用于入侵检测器或金属检测器的传感器系统。 该系统在VHF或UHF频带中发送CW信号，并且接收这些信号的调制分量，这些信号正在从被检测物体中或其上的相互接触的金属体重新辐射。 当这些重新辐射的调制分量的幅度超过预定阈值时，指示对象的存在。