电子信息工程专业毕业设计外文翻译-汽车倒车测距仪的研究

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1、沈阳工业大学本科生毕业设计（论文）外文翻译毕业设计题目：汽车倒车测距仪的研究学院：信息科学与工程学院专业班级：电子信息工程XXXX班学生姓名：XXX指导教师：XXX2012年3月20日原文：UltrasonicdistancemeterDocumentTypeandNumber:UnitedStatesPatentAbstract:Anultrasonicdistancemetercancelsouttheeffectsoftemperatureandhumidityvariationsbyincludingameasuringunitandareferenceunit.Ine

2、achoftheunitsarepetitiveseriesofpulsesisgeneratedeachhavingarepetitionratedirectlyrelatedtotherespectivedistancebetweenanelectroacoustictransmitterandanelectroacousticreceiver.Thepulsetrainsareprovidedtorespectivecountersandtheratioofthecounteroutputsisutilizedtodeterminethedistancebeingmeas

3、ured.PublicationDate:08/15/1995PrimaryExaminer:Lobo,IanJ.A.BACKGROUNDOFTHEINVENTIONThisinventionrelatestoapparatusforthemeasurementofdistanceandmoreparticularlytosuchapparatuswhichtransmitsultrasonicwavesbetweentwopoints.Precisionmachinetoolsmustbecalibrated.Inthepastthishasbeenaccomplishedu

4、tilizingmechanicaldevicessuchascalipersmicrometersandthelike.Howevertheuseofsuchdevicesdoesnotreadilylenditselftoautomationtechniques.Itisknownthatthedistancebetweentwopointscanbedeterminedbymeasuringthepropagationtimeofawavetravellingbetweenthosetwopoints.Onesuchtypeofwaveisanultrasonicorac

5、ousticwave.Whenanultrasonicwavetravelsbetweentwopointsthedistancebetweenthetwopointscanbemeasuredbymultiplyingthetransittimeofthewavebythewavevelocityinthemediumseparatingthetwopoints.Itisthereforeanobjectofthepresentinventiontoprovideapparatusutilizingultrasonicwavestoaccuratelymeasurethedi

6、stancebetweentwopoints.Whenthemediumbetweenthetwopointswhosespacingisbeingmeasuredisairthesoundvelocityisdependentuponthetemperatureandhumidityoftheair.Itisthereforeafurtherobjectofthepresentinventiontoprovideapparatusofthetypedescribedwhichisindependentoftemperatureandhumidityvariations.B.S

7、UMMARYOFTHEINVENTIONTheforegoingandadditionalobjectsareattainedinaccordancewiththeprinciplesofthisinventionbyprovidingdistancemeasuringapparatuswhichincludesareferenceunitandameasuringunit.Thereferenceandmeasuringunitsarethesameandeachincludesanele