文献翻译—超声波测距系统

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1、附录2Thisarticledescribedthethreedirections(before,left,right)ultrasonicrangingsystemistounderstandthefrontoftherobot,leftandrightenvironmenttoprovideamovementawayfromtheinformation.(SimilartoGPSPositioningSystem)Aprincipleofultrasonicdistancemeasurement1，theprincipl

2、eofpiezoelectricultrasonicgeneratorPiezoelectricultrasonicgeneratoristheuseofpiezoelectriccrystalresonatorstowork.Ultrasonicgenerator,theinternalstructureasshowninFigure1，ithastwopiezoelectricchipandaresonanceplate.Whenit'stwopluspulsesignal，thefrequencyequaltothei

3、ntrinsicpiezoelectricoscillationfrequencychip，thechipwillhappenpiezoelectricresonance，andpromotethedevelopmentofplatevibrationresonance，ultrasoundisgenerated.Conversely,ifthetwoarenotinter-electrodevoltage，whentheboardreceivedultrasonicresonance，itwillbeforvibratio

4、nsuppressionofpiezoelectricchip，themechanicalenergyisconvertedtoelectricalsignals，thenitbecomestheultrasonicreceiver.2,theprincipleofultrasonicdistancemeasurementUltrasonictransmitterinadirectiontolaunchultrasound,inthemomenttolaunchthebeginningoftimeatthesametime,

5、thespreadofultrasoundintheair，obstaclesonhiswaytoreturnimmediately，theultrasonicreflectedwavereceivedbythereceiverimmediatelystoptheclock.Ultrasoundintheairasthepropagationvelocityof340m/s，accordingtothetimerrecordsthetimet，wecancalculatethedistancebetweenthelaunch

6、distancebarrier(s)，thatis:s=340t/2UltrasonicRangingSystemfortheSecondCircuitDesignSystemischaracterizedbysingle-chipmicrocomputertocontroltheuseofultrasonictransmitterandultrasonicreceiversincethelaunchfromtimetotime,single-chipselectionof8751，economic-to-use，andth

7、echiphas4KofROM，tofacilitateprogramming.CircuitschematicdiagramshowninFigure2.Drawonlythefrontrangeofthecircuitwiringdiagram，leftandrightinfrontofRangingRangingcircuitsandthesamecircuit，itisomitted.l，40kHzultrasonicpulsegeneratedwiththelaunchRangingsystemusingtheul

8、trasonicsensorofpiezoelectricceramicsensorsUCM40,itsoperatingvoltageofthepulsesignalis40kHz，whichbythesingle-chipimplementationofthefollowingproc