选通型激光成像触控系统设计和精度研究
发布时间:2018-05-16 23:18
本文选题:激光成像 + 时间切片 ; 参考:《哈尔滨工业大学》2015年硕士论文
【摘要】:激光成像技术被多国视为热点研究项目,基于该技术的多种产品广泛应用到各项领域。基于距离选通的激光成像技术,是目前能够实现工程化的少数焦平面激光成像技术之一,它具有视场角大、空间分辨率高和作用距离远等优点。本文针对门控切片成像工程化研究,分析延时精度对成像质量的影响,提出用精确测量代替精确时间控制的思想,完成了门控切片激光成像触发控制系统的硬件设计和实验验证。首先,综述国内外在切片成像方面的研究进展及时间间隔测量技术和局部总线技术的发展情况。分析切片成像方案的时间精度及其影响因素,提出在不改变激光功率和脉宽的情况下,提高精度的方案。其次,使用通用仪器设备进行多次成像实验,明确不同外设之间的触发需求和信号差异,归纳出设备工作时序。提出基于CPCI工控计算机总线构建门控切片激光成像系统的方案。然后,对多功能时序控制模件的硬件进行设计。模件大致可以分为CPCI接口模块,FPGA时序逻辑模块,TDC时间间隔测量模块和DA输出模块。最后,进行门控切片成像的仿真实验和外场实验验证,成像精度达到厘米量级。使用3DMAX软件构建成像目标,通过仿真软件获得目标距离信息,将数据导入Matlab进行数值计算。对比引入时间误差前后的图像质量,分析了距离精度,验证了成像实验方案的可行性。使用自主研发模件,搭建成像平台,对目标进行了门控切片成像,根据质心算法和校准后的延时时间进行数据处理,成像的距离精度达到厘米量级。
[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.
【学位授予单位】:哈尔滨工业大学
【学位级别】:硕士
【学位授予年份】:2015
【分类号】:TN249
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