激光測距系統設計
摘要：本課題從設計1種成本低、工作穩定的高性價比車用LD測距儀出發，分別對測距儀的工作原理及參數確定、
發射驅動電路、光學系統、接收探測電路和軟件 信號處理方面進行了分析和優化設計，設計了1種利用激光脈衝對車間距離進行測量的汽車防追尾碰撞系統，這是1種主動汽車安全系統。在激光從發射到接收這段時間範圍內，透過充電電路對電容進行充電，充電結束時的`電容端電壓即與激光飛行時間相對應，然後透過A/D轉換器轉換成相應的數字量，再送人單片機進行分析處理，將相應的時間間隔換算爲車間距離進行顯示並驅動聲光報警系統，從而提醒司機採取緊急措施以避免與前車發生碰撞等事故。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用價值。
關鍵詞：激光測距儀；汽車防撞；激光脈衝
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
mal 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 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