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目的 设计基于STM32为控制核心的定长切割控制系统。方法 介绍了该系统的工作原理、硬件设计、外部中断跟踪程序的实现以及HMI人机界面的设计。同时,针对刀架以高速返回时的平稳性问题,提出了基于Sigmoid函数的S型算法,并将返回时的主要参数代入该函数中进行MATLAB仿真。结果 经测试,该控制系统满足工作要求。仿真结果表明,刀架返回时的频率曲线是连续平滑的。结论 该控制系统采用STM32替代PLC,成本低,功能稳定,实时性高,操作稳定,能够满足定长切割的精度要求。 相似文献
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本文从整体上分析和研究了控制系统的硬件配置、电路图的设计、程序设计、控制对象数学模型的建立、人机界面的设计等,并基于西门子可编程控制器和组态软件开发了温度控制系统,实现了控制系统的实时监控、数据的实时采样与处理。实验证明,此系统具有快、准、稳等优点,在工业温度控制领域能够广泛应用。 相似文献
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李冠男 《中国新技术新产品》2010,(10):140-140
介绍以FX2N0MR PLC为主控制器,结合N2-420变频器,采用集选控制的方式开发的一套交流变频调速的多层电梯控制系统。通过程序的设计与调试解决了以下问题:定向和平层控制;门控制;内指令和外召唤信号的数字控制。采用FX2N-48MR三菱PLC作为电梯的控制系统,应用于透明仿真教学中,从电梯控制系统的结构组成及其设计思路和具体的硬件设计软件设计,说明如何实现一个电梯控制系统。 相似文献
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线阵推扫式激光成像引信探测技术 总被引:4,自引:1,他引:4
针对环视扫描式激光成像引信探测存在着需要光机扫描和较高的激光脉冲重复频率等问题,提出了一种线阵推扫式激光成像引信探测模式并分析了其探测机理.以对坦克目标探测为例,设计了线阵推扫式激光成像引信探测系统,该探测系统采用线阵半导体激光器阵列发射脉冲激光,线阵光电探测器阵列并行接收来实现一维扫描,弹的飞行实现另一维扫描,在获取目标距离信息基础上进行成像.在对阵列单元激光脚印尺寸大小计算的基础上,确定了该探测系统的基本参数包括所需线阵元数、生成图像大小,半导体激光器阵列的脉冲重复频率和峰值功率等,为系统的工程实现提供了理论依据和设计指导. 相似文献
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电厂燃料传输流量检测装置的研究 总被引:5,自引:0,他引:5
本文采用了基于图像分析的传输流量检测的核心原理和方法——激光扫描成像偏移原理和三角测量方法,利用基于光谱光效率原理的彩色光束成像技术设计了一种新型的用于电厂燃料的传输流量检测装置,通过分析采集的彩色序列图像,检测传输带上实时流量体积进行分析并根据分析结果指导传输控制装置做出相应的动作以使传输流量保持稳定。在实际的电厂中进行了9个运行班次的燃料传输的图像采集和图像分析实验,分析表明,与实际测得的流量相比,检测误差不超过3%。本文设计的传输流量检测装置是可行而且有效的。 相似文献
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N. Jon Shah 《International journal of imaging systems and technology》2011,21(3):271-279
A calibration method for diffusion‐weighted imaging using an isotropic phantom is proposed. The key point of the method consists in finding optimized balancing times for different orientations of diffusion‐encoding gradients followed by retrospective rescaling of the diffusion‐weighted images. The correction protocol was applied to produce improved fractional anisotropy maps which were analyzed with statistical histograms. The results demonstrate that the described scheme of systematic error reduction is a valid approach for quality control studies of gradient system performance for diffusion‐weighted imaging. © 2011 Wiley Periodicals, Inc. Int J Imaging Syst Technol, 21, 271–279, 2011; 相似文献
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太赫兹(THz)波对非极性材料有较好的穿透性,对生物医学组织无电离效应,因而非常适合无损检测、生物医学成像等应用。THz量子阱光电探测器(THz QWPs)具有响应速度快、响应率高、噪声等效功率低、体积小的特点。相较于其他探测器,THz QWPs作为成像系统接收器时,系统具有成像分辨率高、成像速度快、成像信噪比高、结构紧凑等优势。本文综述了基于THz QWPs的成像研究进展,并对成像系统核心指标的影响因素进行了分析和总结。采用更稳定的装置固定THz QWPs,提升器件响应速度、探测灵敏度、阵列规模,可以有效提升系统各项核心性能。 相似文献
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地平式光电成像跟踪测量设备进行目标观测时,由于物像空间旋转而产生像旋,使目标提取和测量出错。为消除像旋,先建立了以球面三角和坐标变换为基础的像旋模型,对像旋模型中各个变量的关系进行了分析,并简介了目前几种常用的消像旋的方法,提出一种采用 CCD相机旋转消像旋的设计思路,详细地描述了消像旋指标、单元结构和控制流程的设计过程,并在某光测设备上实现应用。厂内检测数据和在外场运行试验结果证明,采用 CCD相机旋转消像旋的设计达到设计指标,满足设计要求,保证了光电跟踪测量设备对目标的准确提取和稳定跟踪。 相似文献
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Xu Han Xiaoli Zhao Tao Zeng Yahan Yang Hongyan Yu Cong Zhang Bin Wang Xiaoqian Liu Tao Zhang Jing Sun Xinyuan Li Tuo Zhao Mingxin Zhang Yanping Ni Yanhong Tong Qingxin Tang Yichun Liu 《Small (Weinheim an der Bergstrasse, Germany)》2023,19(8):2206181
Inspired by human eyes, the neuromorphic visual system employs a highly efficient imaging and recognition process, which offers tremendous advantages in image acquisition, data pre-processing, and dynamic storage. However, it is still an enormous challenge to simultaneously simulate the structure, function, and environmental adaptive behavior of the human eye based on one device. Here, a multimodal-synergistic-modulation neuromorphic imaging system based on ultraflexible synaptic transistors is successfully presented and firstly simulates the dry eye imaging behavior at the device level. Moreover, important functions of the human visual system in relation to optoelectronic synaptic plasticity, image erasure and enhancement, real-time preprocessing, and dynamic storage are simulated by versatile devices. This work not only simplifies the complexity of traditional neuromorphic visual systems, but also plays a positive role in the publicity of biomedical eye care. 相似文献
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本文主要介绍了西门子S7—200系列PLC在回转窑控制系统中的应用。通过PLC和触摸屏实现回转窑设备的启停,测温装置的监控等,并通过PROFIBUS—DP总线和全厂的设备都集中控制在一个系统中。 相似文献
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New types of lens-less two-photon ghost imaging experiments are described that can also be useful for 3D X-ray imaging. In these experimental setups, a CCD array is placed facing a chaotic light source and gated by a photon counting detector that simply counts all randomly reflected photons from an object. A “ghost” image of the object is then observed from the gated CCD. A ghost image of an object can even be observed when the photon path to the photon counting device is obscured. These interesting demonstrations are not only useful for practical applications, such as X-ray lens-less imaging, but are also important from a fundamental point of view. These demonstrations lead to insight regarding the nonclassical two-photon interference nature of thermal light ghost imaging. 相似文献
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Zhongtong Luo Huakai Xu Wei Gao Mengmeng Yang Yan He Zihao Huang Jiandong Yao Menglong Zhang Huafeng Dong Yu Zhao Zhaoqiang Zheng Jingbo Li 《Small (Weinheim an der Bergstrasse, Germany)》2023,19(15):2207615
Next-generation imaging systems require photodetectors with high sensitivity, polarization sensitivity, miniaturization, and integration. By virtue of their intriguing attributes, emerging 2D materials offer innovative avenues to meet these requirements. However, the current performance of 2D photodetectors is still below the requirements for practical application owing to the severe interfacial recombination, the lack of photoconductive gain, and insufficient photocarrier collection. Here, a tunneling dominant imaging photodetector based on WS2/Te heterostructure is reported. This device demonstrates competitive performance, including a remarkable responsivity of 402 A W−1, an outstanding detectivity of 9.28 × 1013 Jones, a fast rise/decay time of 1.7/3.2 ms, and a high photocurrent anisotropic ratio of 2.5. These outstanding performances can be attributed to the type-I band alignment with carrier transmission barriers and photoinduced tunneling mechanism, allowing reduced interfacial trapping effect, effective photoconductive gains, and anisotropic collection of photocarriers. Significantly, the constructed photodetector is successfully integrated into a polarized light imaging system and an ultra-weak light imaging system to illustrate the imaging capability. These results suggest the promising application prospect of the device in future imaging systems. 相似文献