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激光測(cè)距系統(tǒng)設(shè)計(jì)
激光測(cè)距系統(tǒng)設(shè)計(jì)
摘要：本課題從設(shè)計(jì)1種成本低、工作穩(wěn)定的高性價(jià)比車用LD測(cè)距儀出發(fā)，分別對(duì)測(cè)距儀的工作原理及參數(shù)確定、
發(fā)射驅(qū)動(dòng)電路、光學(xué)系統(tǒng)、接收探測(cè)電路和軟件 信號(hào)處理方面進(jìn)行了分析和優(yōu)化設(shè)計(jì)，設(shè)計(jì)了1種利用激光脈沖對(duì)車間距離進(jìn)行測(cè)量的汽車防追尾碰撞系統(tǒng)，這是1種主動(dòng)汽車安全系統(tǒng)。在激光從發(fā)射到接收這段時(shí)間范圍內(nèi)，通過充電電路對(duì)電容進(jìn)行充電，充電結(jié)束時(shí)的電容端電壓即與激光飛行時(shí)間相對(duì)應(yīng)，然后通過A/D轉(zhuǎn)換器轉(zhuǎn)換成相應(yīng)的數(shù)字量，再送人單片機(jī)進(jìn)行分析處理，將相應(yīng)的時(shí)間間隔換算為車間距離進(jìn)行顯示并驅(qū)動(dòng)聲光報(bào)警系統(tǒng)，從而提醒司機(jī)采取緊急措施以避免與前車發(fā)生碰撞等事故。所設(shè)計(jì)的LD測(cè)距儀達(dá)到了6～150m的測(cè)量量程和±1m的測(cè)距精度，工作 穩(wěn)定可靠，對(duì)提高駕乘的安全性有良好的實(shí)用價(jià)值。
關(guān)鍵詞：激光測(cè)距儀；汽車防撞；激光脈沖
The Range Acquisition of Laser System
Abstract：A LD rangefinder is designed which has the characters of low cost,reliable and high performance to price
ration.Optimal design of the laser rangefinder is discussed according to the system’s applied demand,laser transmit driver circuit,option system,laser detection circuit and signal process software.In this paper，vehicle rear-end collision avoidance system is discussed and studied which uses laser impulse to measure the distance between two vehicles．It is a kind of active safety system。The capacitance is charged through a kind of charging circuit during time intevals of laser impulse from sending out to receiving 。When it ends up charging ，we can get its voltage which is resistant to the time intevals of laser impulse，transform it into a certain figure by ADC convertor，then input the figure into the computer to analyze，changing the data into distance to display ，besides that，we can use it to drive voice and light panalarm to remind the driver of avoiding rear-end collision accident。The laser rangefinder used in antomobile crashworthy system can get 150m measured range and measurement accuracy easily,and improve security of drive and ride effectively,which confirms that the laser rangefinder is practicable.
Keywords:laser rangefinder;automobile crashworthy;laser burst
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