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成像分辨率是评价CCD成像系统的主要技术指标.提高成像分辨率可以改变CCD的成像性能.本论文以实验的方法验证了倒置光锥CCD耦合器件可提高CCD成像分辨率,同时与正置光锥CCD耦合器件实验结果对比,分别绘制了与非耦合器件的对比传递函数(CTF)曲线,直观地表示出了二者关系,与理论分析结果相吻合. 相似文献
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代荣 《太赫兹科学与电子信息学报》2007,5(6):462-465,472
在分析常用X射线闪光透视技术、电荷耦合器件(CCD)感光成像原理及其高能粒子探测应用的基础上,相对于通常的转换屏耦合CCD间接记录法,采用自行设计的RJ2421AB0PB型CCD感光成像电路,配合图像采集卡和计算机组成实验系统,对不同管电压的X光机所产生的射线进行直接探测成像实验,得到了CCD的直接响应图像,从而分析出CCD对不同能量的X射线光子的响应特性和辐射损伤评估,验证了直接探测技术的可行性,并给出了目标物体的局部闪光透视图像。 相似文献
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介绍了一种微型无线高灵敏度CCD成像系统.该系统由基于Exview HAD CCD的微型成像系统及微型无线视频发射器组成,具有体积小、重量轻、灵敏度高等特点.文中重点介绍了微型高灵敏度成像及无线视频传输的工作原理、基本构成及电路设计.同时。分析了在目前技术条件下实现CCD成像及无线视频传输微型化的主要途径.最后,对微型高灵敏度CCD成像系统与普通CCD进行了对比测试,并对测试结果进行了分析. 相似文献
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CCD图像传感器的输出信号是空间采样的离散模拟信号,其中夹杂着各种噪声和干扰。对CCD信号进行处理的目的就是在不损失图像细节的前提下,尽可能地消除噪声和干扰,以提高信噪比,获取高质量的图像。为此,必须对CCD的噪声种类和特性有所了解,并针对各种噪声进行相应的去噪处理。所以对CCD成像器件噪声部分的研究,有利于提高CCD成像器件的分辨率,也能提高探测微弱光的能力。 相似文献
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七十年代初期问世的电荷耦合器件(CCD),经过十多年的研究,各种性能已进入实用阶段,应用前景十分广阔。如何充分发挥器件的优越性能,便是应用研究人员的重要任务。本文叙述了提高分辨率、提高信噪比的信号处理采样保持电路的设计原则、特点及实测结果。 相似文献
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电荷耦合器件(CCD),作为固体图象传感器,已开拓了从强日光照直到低光强下应用的广阔应用领域。本文主要介绍CCD图象传感器的有关特性。一、分辨率图象传感器的重要特性是分辨率。如前所述,分辨率可用器件的调制转移函数(MTF) 相似文献
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本文描述了一种用于具有彩色滤波阵列固体成像器上的 CCD 彩色信号分离集成电路。该器件通过引入 CCD 延迟线,取样保持电路,以及双箝位电路,从而简化了其外围电路,提高了图像的质量,如分辨率、色彩保真度、及单片式彩色成像系统的稳定性。同时本文描述了一种新的几何图形的彩色滤波阵列,它是该分离集成电路所必需的。当使用一个具有580×475元的 CCD 成像器时,从该器件已经获得其水平分辨率相当于340TV 扫描线,而没有色彩失真的彩色图像。 相似文献
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修正及完善了用多次移位成像提高CCD空间分辨率的反演解析法。通过分析反演解析法的原理,修正了将空间分辨率提高2.5倍的解析关系式,同时阐述了把空间分辨率提高任意倍的移位原则。仿真实验证明了本方法的良好性能。 相似文献
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《Electron Devices, IEEE Transactions on》1977,24(3):286-288
The gap regions of charge-coupled devices made with one-level metallization have been implanted with different doses of boron ions. Two operational modes are possible, depending on the dose of implantation. For low doses the charge of a region is completely transferred--corresponding to the CCD mode-- whereas with high doses only a fraction of the charge is transferred--which is the BBD mode. The implantation of low doses reduces disturbing potential barriers in the gap regions, whereas the implantation of high doses forms an additional p layer in the gap region of the substrate. These p layers form potential wells; the surface potential of these wells will be determined theoretically and experimentally as a function of the implantation dose. Results concerning the transfer inefficiency ε versus frequency are given for both modes of operation. 相似文献
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《Electron Devices, IEEE Transactions on》1979,26(2):117-122
A programmable CCD tapped delay line, useful in radar and communications signal processors, is described. The 64-stage CCD, tapped at each stage, has been operated as a binary-weighted analog correlator, and as a bandpass filter. The CCD is a shallow, buried, n-channel device while the on-chip logic required for reference code input and storage is NMOS. Test results indicate near-theoretical peak-to-sidelobe ratio for 64-bit codes, good linearity, and high-speed operation (in excess of 15 MHz). Differential subtraction of summed signal currents on-chip has been demonstrated. 相似文献
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《Electron Devices, IEEE Transactions on》1978,25(12):1374-1382
This paper introduces a method for enhancing the charge capacity and lowering the leakage current in CCD's. The two-phase coplanar electrode structure is chosen as a vehicle for demonstrating the concept. The charge capacity enhancement is achieved by a combination of p-type and n-type implantations. This method of charge capacity enhancement relies on the increase of depletion capacitance in the storage well region of the CCD, as contrasted with other methods which increase the surface potential swing. A charge capacity analysis is undertaken and design constraints to provide maximum charge capacity are described. Results of measurements on the first test structure show 25-50-percent increase in charge capacity for buried-channel CCD's and 66-166-percent increase in charge capacity for surface-channel CCD's. A 2X-8X reduction in leakage current has been observed in these CCD's. The increased capacity and decreased leakage current should result in improved performance of CCD's in memory, signal processing, and imaging applications. 相似文献
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IntensifiedCCDImageSensor①LIUJikun,ZHAOBaoyun(UniversityofElectronicScienceandTechnology,Chengdu610054,CHN)Abstract:Workhasbe... 相似文献
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《Electron Devices, IEEE Transactions on》1976,23(2):152-155
Some experimental and practical considerations of performing convolution or transversal filtering with charge-coupled devices (CCD's) using optical inputs are described. The basic principle involves shining light from a signal-modulated light-emitting diode (LED) onto an optical mask which controls the amount of light reaching the various CCD electrodes. The experimental results for a 91-tap Hamming window are presented. The relative advantages of using this approach as a means of obtaining fixed tap-weight transversal filters are discussed in comparison with the split electrode CCD filter. It is shown that a compact lens free optical signal processor is possible, using standard imaging structures. Although there is a disadvantage in terms of the need for an LED and current driver, this may be outweighed in certain contexts by improvements in linearity, intermodulation, dynamic range, and the scale of processing which is possible. 相似文献