共查询到18条相似文献，搜索用时 218 毫秒
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光学对中自动测量装置主要由面阵CCD、光源、光学镜头、处理电路和电源模块组成。详细介绍了测量原理,并进行了精度分析。按照实际参数进行了误差计算,对中时测量标准差仅为0.06 mm,实现了高精度测量。 相似文献
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在现代工业生产中,人们通过在线检测的方法对细丝进行实时监测与控制,提高产品合格率以及效率,为人们带来方便,非接触式智能化仪器将逐步取代传统上的机械测量仪器。本文阐述了CCD成像法测量装置的基本原理,分析了光学系统各部分的形式,并采用远心光路成像,从而保证成像质量和测量精度。之后用阈值法提取被测工件的边缘信息,同时还给出了CCD成像法测量直径系统的MATLAB处理后的灰度图。 相似文献
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利用激光器发射激光,照射在坯料两侧,通过高精度线阵CCD作为测量传感器,对原始坯料上的激光光斑位置进行智能测量的光线仪表设备。重点介绍了测宽仪的系统构成,测量原理。 相似文献
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在食品质量检测,化学工业以及纺织品业等领域中,对于颜色信息的识别有着非常重要的作用。本文设计了基于CPLD和彩色线阵CCD的颜色信息测量系统。鉴于CPLD的高速度与纯硬件实现的高稳定性等优点,线阵CCD驱动电路和数据采集与存储控制电路统一由CPLD实现。将本系统嵌入配备有特定光路和数据处理单元的仪器中,可以实现被测物颜色质量的在线准确测量。 相似文献
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针对公交车司机因突发因素导致公交车失控的情况,研究了基于CCD镜头的公交车无人驾驶停车系统,用于实现公交车的自动安全停靠。该系统通过驾驶室紧急按钮一键启动,运用CCD镜头采集交通环境信息,借助超声传感器测量障碍物距离,通过PID算法控制公交车自动驾驶至安全位置开启车门,大大提升了公交车的安全性能。 相似文献
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传统的二维测量设备都是人眼通过目镜来读数的,这就不可避免地存在视觉误差.在传统目视万能工具显微镜的基础上,使用光学CCD代替人眼采集图像,增加光栅尺替代原来的投影式读数器,实现了图像与光栅尺数据的计算机自动采集.通过使用图像处理技术,能自动计算得到工件的几何参数.通过对螺纹的测量,证明了万能工具显微镜的图像法测量的可行性和有效性. 相似文献
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用Madab对添加环反射镜的激光三角法物面测量系统成像位置随物面倾斜角的变化进行建模分析,并绘制特性曲线,结果表明在CCD上成像位置随物面倾斜角呈单调递减变化。 相似文献
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折射率是重要的光学参量之一。随着CCD测量、光纤传感、光谱分析以及计算机技术的发展，新的折射率测量方法不断产生。文章介绍了三种应用上述技术，分别基于几何信息、光强、共振波长调制的新型折射率测量方法。 相似文献
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全波段CCD系统可广泛用于军事、民事或者刑事图像的摄影及提取分析,它的波长介于200nm-1200nm的光谱范围,包括紫外线、可见光和红外线。通过将不可见光图像实时转化为可见光图像,并实现低照度情况下微弱信号的采集以及高质量图像的采集和处理(需要注意不同光强对图像清晰度的还原有巨大影响作用),使得全波段CCD系统具备了地形地貌扫描、痕迹探查、文件检验、全息摄影和图像处理于一体的强大功能。文章概要介绍了全波段CCD系统的结构、特点与在影像判读技术方面的应用,并选取实验波段CCD进行了初步验证。 相似文献
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A barrier in scaling laboratory processes into automated microfluidic devices has been the transfer of laboratory based assays: Where engineering meets biological protocol. One basic requirement is to reliably and accurately know the distribution and number of biological cells being dispensed. In this study, a novel optical counting technique to efficiently quantify the number of cells flowing into a microtube is presented. REH, B-lymphoid precursor leukemia, are stained with a fluorescent dye and frames of moving cells are recorded using a charge coupled device (CCD) camera. The basic principle is to calculate the total fluorescence intensity of the image and to divide it by the average intensity of a single cell. This method allows counting the number of cells with an uncertainty ±5%, which compares favorably to the standard biological methodology, based on the manual Trypan Blue assay, which is destructive to the cells and presents an uncertainty in the order of 20%. The use of a microdevice for vertical hydrodynamic focusing, which can reduce the background noise of out of focus cells by concentrating the cells in a thin layer, has further improved the technique. Computational fluid dynamics (CFD) simulation and confocal laser scanning microscopy images have shown an 82% reduction in the vertical displacement of the cells. For the flow rates imposed during this study, a throughput of 100–200 cells∕s is achieved. 相似文献
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光电传感技术中CCD图像传感器的研究 总被引：1，自引：0，他引：1
本文主要介绍了光电检测系统的组成及各部分的内容,并结合光电传感器技术,介绍了CCD传感器的组成和工作原理。最后举出了两种不同结构的CCD传感器.并简述了CCO传感器的发展趋势。 相似文献
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Approximate mathematical form expressions were derived for the estimation of the average (ergodic) capacity and the average bit error rate of a log-normal free space optical channel in the cases of weak to moderate atmospheric turbulence conditions. We investigate the average capacity, the average bit error rate and the outage probability of free space optical communication channels using the frequentist and the Bayesian approach. Emphasis is given on the cases of weak to moderate atmospheric turbulence leading to channels modeled by log-normal distributed intensity fading. Furthermore, accurate approximate closed-form expressions and estimation procedures for their achievable capacity as well as their bit error rate and the important parameters of interest are derived. The derived approximate analytical expressions are verified by various numerical examples and simulations. Moreover, each methodology is reviewed in terms of their analytic convenience and their accuracy is also discussed. 相似文献
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Junxiao Zhou Haoliang Qian Junxiang Zhao Min Tang Qianyi Wu Ming Lei Hailu Luo Shuangchun Wen Shaochen Chen Zhaowei Liu 《国家科学评论(英文版)》2021,8(6)
Optical analog signal processing technology has been widely studied and applied in a variety of science and engineering fields, with the advantages of overcoming the low-speed and high-power consumption associated with its digital counterparts. Much attention has been given to emerging metasurface technology in the field of optical imaging and processing systems. Here, we demonstrate, for the first time, broadband two-dimensional spatial differentiation and high-contrast edge imaging based on a dielectric metasurface across the whole visible spectrum. This edge detection method works for both intensity and phase objects simply by inserting the metasurface into a commercial optical microscope. This highly efficient metasurface performing a basic optical differentiation operation opens up new opportunities in applications of fast, compactible and power-efficient ultrathin devices for data processing and biological imaging. 相似文献
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基于ARM7与FPGA架构的面阵CCD图像采集系统的设计 总被引：1，自引：0，他引：1
针对用于铁路、公路等行业移动检测的面阵CCD图像采集系统对于小型化与低功耗的需求,设计了一种基于ARM7与FPGA架构的面阵CCD图像采集系统。本文介绍了系统设计的基本原理,并着重阐述了图像A/D转换单元、图像缓冲单元、图像处理单元等系统主要组成部分的软、硬件设计。本系统利用FPGA控制视频信号的采集、ARM7微控制器作为图像处理单元,并利用μC/OS-II实时操作系统对多任务进行管理,系统扩展灵活,满足小型化与低功耗的要求。 相似文献