一种金属探测器的设计  

Design of a metal detector

作　　者：张学勇[1] 赵群[1] 李义宝[1] 唐震[1] 

机构地区：[1]安徽建筑工业学院数理系,合肥230022

出　　处：《安徽建筑工业学院学报（自然科学版）》2007年第3期74-77,94,共5页Journal of Anhui Institute of Architecture(Natural Science)

基　　金：安徽省教育厅自然科学基金资助项目(2005KJ228);安徽省教育厅教研基金资助项目(2005271)

摘　　要：针对普通便携式金属探测器存在的抗干扰能力差、误判率高等缺点,本文应用Siller电容三点式振荡电路作为探测振荡器,基于F/V变换原理,采用锁相环电路和窗口门限技术将探测信号的频率变化转换成电压变化,设计了一种新型金属探测器。试验结果表明,该探测器具有较高的探测灵敏度,不仅能够判断出金属的位置,还可检测出金属的性质。In order to improve anti-jamming ability and overcome a larger amount of false alarms in traditional portable metal detectors, a new type of metal detector based on the principle of the F/V conversion is presented. A Siller＇s oscillator circuit of three-point capacitance acting as the detector oscillator, a phase-locked loop circuit and a window comparator converted the change of frequency into that of the voltage. Preliminary experimental results showed the metal detector with high sensitivity and stability can not only detect the positions of metals, but also can determine the detected metals.

关 键 词：金属探测器 F/V变换 锁相环 窗口门限技术 

分 类 号：TM930.12[电气工程—电力电子与电力传动]