基于单片机技术的便携式金属探测器设计与实现  

Design and Implementation of Portable Metal Detectors Based on Microcomputer on Single Chip

作　　者：王贵锋[1] 闫璞[1] 

机构地区：[1]兰州理工大学技术工程学院,甘肃兰州730050

出　　处：《自动化与仪器仪表》2016年第3期87-89,共3页Automation & Instrumentation

摘　　要：金属探测器广泛应用于矿山勘探、工业生产、安检、娱乐等领域。基于单片机技术,设计了一个手持金属探测器,用于检测人们随身携带的金属物品,可随身携带,使用方便。置于变化磁场中金属,会在内部产生涡流,涡流产生的磁场反过来又影响原磁场,将该变化转换为频率和幅值的变化,供相关电路进行检测。由电容三点式振荡电路产生正弦波,经过放大和整形后,送入单片机,由单片机探测频率的变化。当有金属存在时,原有的振荡频率将发生变化,单片机探测到这种变化后进行报警。设计的接口电路可以和外围系统进行通讯,包括与液晶显示、外围数据处理、显示模块的通信。Metal detectors were widely used in mine exploration,industrial production,security,entertainment fields.The portable metal detector was designed and implemented based on microcomputer on single chip(MSC),to detect metal items taken with persons conveniently.An eddy current may be generated inside the metal placed in the variable magnetic field,the eddy current will generate a magnetic field in turn affecting the original field.The changes in frequency and amplitude can be measured.A sinusoidal waves produced by the capacitance three-point oscillating circuit were amplified and reshaped, and then to be sent to the MSC.When detecting the variation in frequency,MCU will alarm.The designed interface communicates with peripheral systems,including display module,peripheral data processing,liquid crystal display and keyboard modules.

关 键 词：金属探测器 电磁感应 单片机 涡流 振荡电路 

分 类 号：TH89[机械工程—仪器科学与技术] TP368.1[机械工程—精密仪器及机械]