本文選題：激光距離選通 + 微光成像�。� 參考：《北京理工大學》2015年碩士論文

【摘要】：文針對主動夜視成像系統(tǒng),提出了采用激光距離選通的技術實現(xiàn)對5km處的中型汽車等典型目標成像的超遠作用距離微光成像系統(tǒng)的設計。系統(tǒng)地論述了激光距離選通成像技術的結構、工作原理、工作性能以及關鍵點。激光距離選通技術采用紅外激光作為輔助照明源,照明目標物體,利用同步控制技術控制激光脈沖的發(fā)射和攝像機選通門的開閉,從而實現(xiàn)距離選通,減少了被探測到的可能,并且有效抑制后向散射現(xiàn)象,同時采用像增強器顯著提高系統(tǒng)的作用距離,實現(xiàn)了在低照度環(huán)境下對遠距離目標的探測。本論文以激光距離選通技術為基礎,建立了基于信噪比的距離模型,給出了主動成像的視距估算方法,并通過對視距的估算以及系統(tǒng)的性能計算出系統(tǒng)所需的激光器的功率以及所發(fā)出的的激光的光強,并且設計了基于FPGA的同步控制電路,得到脈寬和系統(tǒng)重復頻率可調的脈沖時序,精度可達到ns級。另外,本文還設計了像增強器的高壓供電部分和基于MOSFET的高壓脈沖開關電路。通過本文的設計為開發(fā)具有實際應用功能的超遠作用距離成像系統(tǒng)打下了堅實的基礎。
[Abstract]:Aiming at the active night vision imaging system, this paper presents the design of ultra-long range LLL imaging system for typical targets such as medium vehicles at 5km using laser range-gating technology. The structure, working principle, working performance and key points of laser range-gated imaging technology are discussed systematically. The laser range gating technology uses infrared laser as the auxiliary illumination source, illuminates the target object, uses the synchronous control technology to control the laser pulse emission and the camera gate opening and closing, thus realizes the distance gating, reduces the possibility of being detected. The backscattering phenomenon is effectively suppressed and the image intensifier is used to increase the operating range of the system so as to realize the detection of long range targets in low illuminance environment. Based on the laser range-gating technology, a range model based on SNR is established in this paper, and a method for estimating the visual range of active imaging is presented. The power of the laser and the intensity of the laser are calculated by estimating the range of sight and the performance of the system, and the synchronous control circuit based on FPGA is designed. Pulse timing with adjustable pulse width and repetition rate is obtained, and the accuracy can reach ns level. In addition, the high voltage power supply part of image intensifier and the high voltage pulse switch circuit based on MOSFET are designed. The design of this paper lays a solid foundation for the development of ultra-long range imaging system with practical application function.
【學位授予單位】：北京理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TP391.41;TN249

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本文編號：2044766