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1、毕业论文设计摘要本文介绍了一种基于AT89S52单片机控制的智能型金属探测器重点研究了它的硬件组成、软件设计、工作原理及主要功能。该金属探测器以AT89S52单片机为核心，采用线性霍尔元件UGN3503作为传感器，来感应金属涡流效应引起的通电线圈磁场的变化，并将磁场变化转化为电压的变化，单片机测得电压值，并与设定的电压基准值相比较后，决定是否探测到金属。系统软件采用汇编语言编写。在软件设计中，采用了数字滤波技术消除干扰，提高了探测器的抗干扰能力，确保了系统的准确性。关键词：单片机金属探测器线性霍尔元件电磁感应.ABSTRACTThispaperdescribesthecom
2、positionofhardwareandsoftware,workingprinciplesandthefunctionsofanintelligentmetaldetectorwhichmainlyconsistsofAT89S52SingleChipMicyocoandlinearHall-EffectSensor.TheequipmentadoptsUGN3503Ulinearhall-effectsensorasprobetodetectthefieldchangeofthecentreofasearchcoilresultedfromeddycurrenteff
3、ectandturnthismagneticfieldchangeintovoltagechange.TheSCMmeasuresthepeakvalueofvoltageandcomparesitwithreferencevoltage.Thendeterminewhetherdetectmetalornot.Incaseofdetectionofametallicmass,theMetalDetectorprovidesanacousticalandopticalalarm.Thesystemssoftwareadoptstheassemblerlanguagetobe
4、written.Insidethesoftware,thedigitalfiltertechnologyisutilizedtoeliminatethejamming.Sothestabilityofsystemandthemeasuringveracityareimproved.KEYWORDS:SCM(SingleChipMicyoco)metaldetector.spotwelding,spotweldingfittingsmatmustbeplacedfirmlybefore,toavoidforcedgroupstoarise,additionalstressca
5、usedbycrack.(5)theGroovepositionweldsandweldingthesameweldingprocessshouldbeadopted,byqualifiedWeldersandwelding.Tackweldshouldbeevenlydistributed,thereisgenerallynolessthan2-3,lengthshouldbeto10-15mm,uniformdistribution,wallthicknessofnomorethan2/3.(6)thetackshouldensuregoodpenetrationand
6、fusion,andfreeofporosity,slagandotherdefects.(7)toensurethebottombeadmoldingwelltoreducestressconcentration,tackshouldbeasmoothtransitiontothebasemetalandweldspolishedatbothendsshouldbegenerated.(8)unlesstheprocessorinspectionrequired-welded,buteachseamcontinuousweldingfinish,otherwiseagai
7、nbeforewelding,topreheattheweld.(9)theweldingarcscrapedsurfaceisstrictlyprohibited,withoutanyintroductionarcweldingonthesurface.(10)shouldensurethatthearcandarcweldingofquality,arcshouldfillcrater,multi-passweldingjointshouldbestaggered.(11)Tigweldingshouldbev
