红外与激光工程
紅外與激光工程
홍외여격광공정
INFRARED AND LASER ENGINEERING
2014年
8期
2668-2672
,共5页
徐正平%沈宏海%许永森%孙超%黄厚田%姚园
徐正平%瀋宏海%許永森%孫超%黃厚田%姚園
서정평%침굉해%허영삼%손초%황후전%요완
激光成像系统%时刻鉴别%峰值保持%距离%强度
激光成像繫統%時刻鑒彆%峰值保持%距離%彊度
격광성상계통%시각감별%봉치보지%거리%강도
laser imaging system%timing discriminator%peak holding%distance%intensity
为提高脉冲激光3D 成像系统中提取目标距离和强度信息的精度,对时刻鉴别和峰值保持电路进行了深入研究。在简要分析激光测距体制及探测器选择的基础上,给出了激光3D 成像系统结构框图:激光器输出信号经半反半透棱镜,反射光线触发参考 APD 作为计时起始信号,以提高计时基准。给出了恒定阈值鉴别与恒比定时鉴别相结合的时刻鉴别电路,在提高时刻鉴别精度的同时可有效消除噪声对电路的影响。峰值保持选取基于 OPA861的跨导型峰值保持电路。在实验室搭建了回波信号模拟系统,并在此基础上对电路性能进行测试。最后,给出了实验结果。结果显示:时刻鉴别电路精度优于1 ns;当输入窄脉冲峰值信号低于800 mV 时,峰值保持电路保持精度优于2.63%。整个结果满足后续实验要求。
為提高脈遲激光3D 成像繫統中提取目標距離和彊度信息的精度,對時刻鑒彆和峰值保持電路進行瞭深入研究。在簡要分析激光測距體製及探測器選擇的基礎上,給齣瞭激光3D 成像繫統結構框圖:激光器輸齣信號經半反半透稜鏡,反射光線觸髮參攷 APD 作為計時起始信號,以提高計時基準。給齣瞭恆定閾值鑒彆與恆比定時鑒彆相結閤的時刻鑒彆電路,在提高時刻鑒彆精度的同時可有效消除譟聲對電路的影響。峰值保持選取基于 OPA861的跨導型峰值保持電路。在實驗室搭建瞭迴波信號模擬繫統,併在此基礎上對電路性能進行測試。最後,給齣瞭實驗結果。結果顯示:時刻鑒彆電路精度優于1 ns;噹輸入窄脈遲峰值信號低于800 mV 時,峰值保持電路保持精度優于2.63%。整箇結果滿足後續實驗要求。
위제고맥충격광3D 성상계통중제취목표거리화강도신식적정도,대시각감별화봉치보지전로진행료심입연구。재간요분석격광측거체제급탐측기선택적기출상,급출료격광3D 성상계통결구광도:격광기수출신호경반반반투릉경,반사광선촉발삼고 APD 작위계시기시신호,이제고계시기준。급출료항정역치감별여항비정시감별상결합적시각감별전로,재제고시각감별정도적동시가유효소제조성대전로적영향。봉치보지선취기우 OPA861적과도형봉치보지전로。재실험실탑건료회파신호모의계통,병재차기출상대전로성능진행측시。최후,급출료실험결과。결과현시:시각감별전로정도우우1 ns;당수입착맥충봉치신호저우800 mV 시,봉치보지전로보지정도우우2.63%。정개결과만족후속실험요구。
In order to enhance the precision of target distance and intensity information in pulse laser 3D imaging system, the time-discriminating circuit and peak holding circuit were studied in detail. Based on analyzing the laser distance-detecting method and the selection of detector, the principle diagram of pulse laser 3D imaging system was given. In this system, pulse from laser was sent to transflective prism, and the reflected light triggered reference APD. Output signal from the reference APD was selected as starting signal for timing to enhance timing basic. Constant threshold discriminator and constant fraction discriminator were combined to form the timing discriminator. In this method, high precision of timing discriminator could be achieved while eliminating the effect of noise to the circuit. The transconductance circuit based on OPA861 was selected to hold the peak signal. The APD signal simulating system was constructed in laboratory, and performance of those circuits were tested. At l ast, testing result was given. Result shows that the precision of time discriminating circuit is better than 1 ns and the precision of peak holding circuit is better than 2.63% when the peak value of narrow pulse signal is less than 800 mV. The result can satisfy the requirement of latter experiment.