1、0長(zhǎng)沙航空職業(yè)技術(shù)學(xué)院2012屆畢業(yè)設(shè)計(jì)（論文）基于單片機(jī)的智能型金屬探測(cè)器的設(shè)計(jì)學(xué)院（部）：航空電子電氣工程系專業(yè)：應(yīng)用電子技術(shù)學(xué)生姓名：梁藝鐘班級(jí)：電子0901學(xué)號(hào)67指導(dǎo)教師姓名：謝佳君職稱助教最終評(píng)定成績(jī)2012年5月2ABSTRACTMetaldetectisaninstrumentwhichusefdetectingmetalspecially.ithasbeenextensivelyusedinproduceSafetyi

2、nspectionentertainmentsoon.HerewedesignedahheldmetaldetectswhichbasedontheMCU.Itcandetectpeoplecarryingmetalitemssuchasknivespensevenboxesofcigarettes(withinthealuminumfilm).Ptableeasytouse.Itismadeaccdingtoprincipleofel

3、ectromagisminduction.whenweputanmetalobjectaroundmagicfieldwithchangingseries.therewillproducevtexinnermetalobject.Thevtexwillcreatemagicfieldtoo.Thenewmagicfieldwillaffecttheold.Thechangecanbeconvertintovoltagesignalfde

4、tectingbyrelativeelectrocircuit.Itcanalsoconvertintofrequencysignalbedetectedbyfrequencydetect.Hereweusethesecondmethod.TheoscillationcircuitpartiscomposedbyCapacitancethreepointoscillationcircuit.Thesignalcreatedbythepa

5、rtismagnifiedfirstthenconvertintoimpulsesignal.ThenitcanbeprocessedbySCM.SCMdetectitsfrequencycomparewiththebasefrequencythendeterminewhethertown.Weaddaninterfacetothedetect.SoitcancommunicatewithotherSCMsystemwhichconte

6、ntalcdakeyboardaSCM.TheSCMsystemcanprocessthedatamepreciselythendisplaytheresultthroughlcd.thekeyboardisusedfuserwhowanttosetthedetectingprecision.Keywds:metaldetecttheprincipleofelectromagisminductionSCMvtexoscillationc