本文選題：激光成像 + 時(shí)間切片��； 參考：《哈爾濱工業(yè)大學(xué)》2015年碩士論文

【摘要】：激光成像技術(shù)被多國視為熱點(diǎn)研究項(xiàng)目,基于該技術(shù)的多種產(chǎn)品廣泛應(yīng)用到各項(xiàng)領(lǐng)域�；诰嚯x選通的激光成像技術(shù),是目前能夠?qū)崿F(xiàn)工程化的少數(shù)焦平面激光成像技術(shù)之一,它具有視場(chǎng)角大、空間分辨率高和作用距離遠(yuǎn)等優(yōu)點(diǎn)。本文針對(duì)門控切片成像工程化研究,分析延時(shí)精度對(duì)成像質(zhì)量的影響,提出用精確測(cè)量代替精確時(shí)間控制的思想,完成了門控切片激光成像觸發(fā)控制系統(tǒng)的硬件設(shè)計(jì)和實(shí)驗(yàn)驗(yàn)證。首先,綜述國內(nèi)外在切片成像方面的研究進(jìn)展及時(shí)間間隔測(cè)量技術(shù)和局部總線技術(shù)的發(fā)展情況。分析切片成像方案的時(shí)間精度及其影響因素,提出在不改變激光功率和脈寬的情況下,提高精度的方案。其次,使用通用儀器設(shè)備進(jìn)行多次成像實(shí)驗(yàn),明確不同外設(shè)之間的觸發(fā)需求和信號(hào)差異,歸納出設(shè)備工作時(shí)序。提出基于CPCI工控計(jì)算機(jī)總線構(gòu)建門控切片激光成像系統(tǒng)的方案。然后,對(duì)多功能時(shí)序控制模件的硬件進(jìn)行設(shè)計(jì)。模件大致可以分為CPCI接口模塊,FPGA時(shí)序邏輯模塊,TDC時(shí)間間隔測(cè)量模塊和DA輸出模塊。最后,進(jìn)行門控切片成像的仿真實(shí)驗(yàn)和外場(chǎng)實(shí)驗(yàn)驗(yàn)證,成像精度達(dá)到厘米量級(jí)。使用3DMAX軟件構(gòu)建成像目標(biāo),通過仿真軟件獲得目標(biāo)距離信息,將數(shù)據(jù)導(dǎo)入Matlab進(jìn)行數(shù)值計(jì)算。對(duì)比引入時(shí)間誤差前后的圖像質(zhì)量,分析了距離精度,驗(yàn)證了成像實(shí)驗(yàn)方案的可行性。使用自主研發(fā)模件,搭建成像平臺(tái),對(duì)目標(biāo)進(jìn)行了門控切片成像,根據(jù)質(zhì)心算法和校準(zhǔn)后的延時(shí)時(shí)間進(jìn)行數(shù)據(jù)處理,成像的距離精度達(dá)到厘米量級(jí)。
[Abstract]:Laser imaging technology is regarded as a hot research project in many countries. Many products based on laser imaging technology are widely used in various fields. The laser imaging technology based on range-gated is one of the few focal plane laser imaging techniques which can realize engineering at present. It has the advantages of large field of view, high spatial resolution and long operating distance. In this paper, aiming at the engineering research of gated slice imaging, the effect of delay precision on imaging quality is analyzed, and the idea of replacing accurate time control with accurate measurement is put forward. The hardware design and experimental verification of the gated slice laser imaging trigger control system are completed. Firstly, the research progress in slice imaging and the development of time interval measurement and local bus technology are reviewed. This paper analyzes the time precision of slice imaging scheme and its influencing factors, and proposes a scheme to improve the accuracy without changing laser power and pulse width. Secondly, multiple imaging experiments are carried out with universal instrument equipment to identify the trigger requirements and signal differences between different peripheral devices, and conclude the working time sequence of the equipment. A scheme of gated slice laser imaging system based on CPCI industrial control computer bus is proposed. Then, the hardware of multifunctional timing control module is designed. The module can be divided into CPCI interface module, FPGA timing logic module and DA output module. Finally, the simulation and field experiments of gated slice imaging show that the imaging accuracy is in centimeter order. The imaging target is constructed with 3DMAX software, and the distance information is obtained by simulation software, and the data is imported into Matlab for numerical calculation. Comparing the image quality before and after introducing time error, the range accuracy is analyzed, and the feasibility of imaging experimental scheme is verified. By using the self-developed module, the imaging platform was built, and the gated slice imaging was carried out on the target. According to the centroid algorithm and the delay time after calibration, the data processing was carried out, and the range accuracy of the imaging reached the centimeter level.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN249

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本文編號(hào)：1898852