超声波测距仪毕业论文外文文献翻译及原文

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1、毕业设计（论文）外文文献翻译文献、资料中文题目：超声波测距仪文献、资料英文题目：文献、资料来源：文献、资料发表（出版）日期：院（部）：专业：班级：姓名：学号：指导教师:翻译日期:2017.02.14英文文献翻译Ultrasonicdistancemeter文献来源:UnitedStatesPatent5442592作者：Lobo，IanJ.（罗保•伊恩j.文献来源:UnitedStatesPatent5442592作者：Lobo，IanJ.（罗保•伊恩j.UltrasonicdistancemeterAbstract:Anultrasonic

2、distancemetercancelsouttheeffectsoftemperatureandhumidityvariationsbyincludingameasuringunitandareferenceunit.Ineachoftheunits,arepetitiveseriesofpulsesisgenerated，eachhavingarepetitionratedirectlyrelatedtotherespectivedistancebetweenanelectroacoustictransmitterandanelectro

3、acousticreceiver.Thepulsetrainsareprovidedtorespectivecounters，andtheratioofthecounteroutputsisutilizedtodeterminethedistancebeingmeasured.一、BACKGROUNDOFTHEINVENTIONThisinventionrelatestoapparatusforthemeasurementofdistanceand,moreparticularly,tosuchapparatuswhichtransmitsu

4、ltrasonicwavesbetweentwopoints.Precisionmachinetoolsmustbecalibrated.Inthepast，thishasbeenaccomplishedutilizingmechanicaldevicessuchascalipers,micrometers,andthelike.However，theuseofsuchdevicesdoesnotreadilylenditselftoautomationtechniques.Itisknownthatthedistancebetweentwo

5、pointscanbedeterminedbymeasuringthepropagationtimeofawavetravellingbetweenthosetwopoints.Onesuchtypeofwaveisanultrasonic，oracoustic,wave.Whenanultrasonicwavetravelsbetweentwopoints，thedistancebetweenthetwopointscanbemeasuredbymultiplyingthetransittimeofthewavebythewaveveloc

6、ityinthemediumseparatingthetwopoints.Itisthereforeanobjectofthepresentinventiontoprovideapparatusutilizingultrasonicwavestoaccuratelymeasurethedistancebetweentwopoints.Whenthemediumbetweenthetwopointswhosespacingisbeingmeasuredisair，thesoundvelocityisdependentuponthetempera

7、tureandhumidityoftheair.Itisthereforeafurtherobjectofthe，presentinventiontoprovideapparatusofthetypedescribedwhichisindependentoftemperatureandhumidityvariations.二、SUMMARYOFTHEINVENTIONTheforegoingandadditionalobjectsareattainedinaccordancewiththeprinciplesofthisinventionby

8、providingdistancemeasuringapparatuswhichincludesareferenceunitandameasuringunit.Th