激光測距系統設計

激光測距系統設計
 
摘要：本課題從設計1種成本低、工作穩定的高性?xún)r(jià)比車(chē)用LD測距儀出發(fā)，分別對測距儀的工作原理及參數確定、
發(fā)射驅動(dòng)電路、光學(xué)系統、接收探測電路和軟件 信號處理方面進(jìn)行了分析和優(yōu)化設計，設計了1種利用激光脈沖對車(chē)間距離進(jìn)行測量的汽車(chē)防追尾碰撞系統，這是1種主動(dòng)汽車(chē)安全系統。在激光從發(fā)射到接收這段時(shí)間范圍內，通過(guò)充電電路對電容進(jìn)行充電，充電結束時(shí)的電容端電壓即與激光飛行時(shí)間相對應，然后通過(guò)A/D轉換器轉換成相應的數字量，再送人單片機進(jìn)行分析處理，將相應的時(shí)間間隔換算為車(chē)間距離進(jìn)行顯示并驅動(dòng)聲光報警系統，從而提醒司機采取緊急措施以避免與前車(chē)發(fā)生碰撞等事故。所設計的LD測距儀達到了6～150m的測量量程和±1m的測距精度，工作 穩定可靠，對提高駕乘的安全性有良好的實(shí)用價(jià)值。

關(guān)鍵詞：激光測距儀；汽車(chē)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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