APPARATUS USED FOR DETECTING METAL, METAL DETECTION APPARATUS AND METHOD, AND VEHICLE DETECTOR

摘要

An apparatus used for detecting metal includes a signal sending circuit (102) and a signal receiving circuit (103). The signal sending circuit (102) includes first group of LC parallel circuits (L1, C1) and second group of LC parallel circuits (L2, C2). The first group of LC parallel circuits (L1, C1) can be connected with a signal source (101), receive first group of square wave signals from the signal source (101) and generate a first magnetic field; the second group of LC parallel circuits (L2, C2) can be connected with the signal source (101), receive second group of square wave signals from the signal source (101) and generate a second magnetic field; the first and second groups of square wave signals have inverse phases, and square wave signals in each group have the same phase. The signal receiving circuit (103) includes at least one receiving coil (L3), which can be connected with the signal source (101), generates and feeds inductive current to the signal source (101).