激光测距系统设计讲解.doc

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1、激光测距系统设计    激光测距系统设计 摘要：本课题从设计1种成本低、工作稳定的高性价比车用LD测距仪出发，分别对测距仪的工作原理及参数确定、发射驱动电路、光学系统、接收探测电路和软件信号处理方面进行了分析和优化设计，设计了1种利用激光脉冲对车间距离进行测量的汽车防追尾碰撞系统，这是1种主动汽车安全系统。在激光从发射到接收这段时间范围内，通过充电电路对电容进行充电，充电结束时的电容端电压即与激光飞行时间相对应，然后通过A/D转换器转换成相应的数字量，再送人单片机进行分析处理，将相应的时间间隔换算为车间距离

2、进行显示并驱动声光报警系统，从而提醒司机采取紧急措施以避免与前车发生碰撞等事故。所设计的LD测距仪达到了6～150m的测量量程和±1m的测距精度，工作稳定可靠，对提高驾乘的安全性有良好的实用价值。关键词：激光测距仪；汽车防撞；激光脉冲TheRangeAcquisitionofLaserSystem Abstract：ALDrangefinderisdesignedwhichhasthecharactersoflowcost,reliableandhighperformancetopriceration.Op

3、timaldesignofthelaserrangefinderisdiscussedaccordingtothesystem’sapplieddemand,lasertransmitdrivercircuit,optionsystem,laserdetectioncircuitandsignalprocesssoftware.Inthispaper，vehiclerear-endcollisionavoidancesystemisdiscussedandstudiedwhichuseslaserimpul

4、setomeasurethedistancebetweentwovehicles．Itisakindofactivesafetysystem。Thecapacitanceischargedthroughakindofchargingcircuitduringtimeintevalsoflaserimpulsefromsendingouttoreceiving。Whenitendsupcharging，wecangetitsvoltagewhichisresistanttothetimeintevalsofl

5、aserimpulse，transformitintoacertainfigurebyADCconvertor，theninputthefigureintothecomputertoanalyze，changingthedataintodistancetodisplay，besidesthat，wecanuseittodrivevoiceandlightpanalarmtoremindthedriverofavoidingrear-endcollisionaccident。Thelaserrangefind

6、erusedinantomobilecrashworthysystemcanget150mmeasuredrangeandmeasurementaccuracyeasily,andimprovesecurityofdriveandrideeffectively,whichconfirmsthatthelaserrangefinderispracticable.Keywords:laserrangefinder;automobilecrashworthy;laserburst