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设计了Ⅻehelson干涉型激光波长计干涉条纹的单片微机计数硬件电路,编写了8254计数和KeilC51波长运算程序.为提高仪器的测量精度,在硬件和软件上提出了新的设计方案.两个8254计数器可以在单片微机的控制下自动从参考光脉冲信号的下降沿开始对参考信号和被测信号同时计数;参考激光干涉条纹计数满1500000后。参考信号和被测信号的计数器可以同时被自动锁定;单片微机得到锁定信号后,完成两个计数值的读取、波长运算、10次移位平均和7位波长显示.对633nm和532nm两种稳频激光波长进行了实际测量,测量数据表明该计数系统使波长的测量精度达到2×10^-7. 相似文献
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为分析计数器传感器系统各部分对测量结果的影响,从信息的角度出发,在信息论的基础上建立激光尘埃粒子计数器的数学模型.将输入的粒子群的粒径分布看作信源,输出的信号幅度分布看作信宿,将整个计数器看作信道,建立与之对应的数学模型.同时初步探讨了信息论在激光尘埃粒子计数器的应用,利用信息熵来评价信号幅度分布的离散度,用平均互信息来评价计数器对两种不同粒径的粒子的区分度,结果表明当粒子信号幅度分布的信息熵越大时,仪器的性能越差,并用实验进行了验证.这一研究结果为仪器性能的改进提供了指导方向. 相似文献
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本研究提出一种新式的微型细胞颗粒计数器,此微型细胞颗粒计数器结合二维水力聚焦及微文件流结构(micro-weir structure)于微管道中,可进行高精确度及均一性的细胞或颗粒计数,本研究是利用简单的等向性(isotropie)的湿式蚀刻技术来制作微文件流结构于玻璃基材上,而此微型细胞颗粒计数器的主要构成的组件包含二维边鞘流的聚焦结构,其主要功能为将细胞或颗粒聚焦于x-Y平面上,而微文件流结构的目的在于将细胞或颗粒在z方向的筛选,最后利用雷射诱导荧光系统将细胞或颗粒侦测出.在实验与数值分析的结果,显示此微型细胞颗粒计数器确实可进行高精确度及均一性的细胞或颗粒的计数,并且可以提供一个微型化的生物分析系统. 相似文献
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为提高细胞内产物的产量以及质量,结合机器视觉技术,在传统Hough图像识别算法以及现有的细胞破碎装置的基础上进行改进,提出了一种应用于细胞破碎的智能监测计数系统的设计方案。该方案以光学放大电路、CCD图像传感电路为硬件平台,辅以机器视觉技术、图像处理算法实现对细胞破碎过程的图像监测及计数统计。在线实验监测表明,该智能监测计数系统能够完成对细胞破碎的统计计数,其识别速度相对于标准的Hough图像识别算法提高了近10倍,并能实时捕捉细胞破碎图像,可应用于细胞破碎产物的自动化提取。 相似文献
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在火工品生产中,经常要对产品进行计数,以便进行分装和统计产量。自动记数的方式大致可以分为机械式和电子式两类。机械式计数器简单直观,容易掌握,抗干扰。但是体积较大,有噪音,不容易和自动定量仪、计算机等装置接口。此外,易产生火花,不利于火工品安全生产。电子计数器却具有体积小、无噪音、易于和其它装置接口等优点,在生产中正日益广泛地被采用。电子计数器是由一些二极管、三极管和其他电子器件组成的计数系统。按其采样、转换、显示方式的不同,可以组合成多种型式的计数器。由于计数显示器已有多种定型产品,计数装置的设计,重点在于设计计数传感器。 相似文献
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建立了一种变模温和型腔气体反压协同控制的微孔发泡注塑技术,研制了相应的变模温控制系统与型腔气体反压控制系统,构建了变模温与型腔气体反压辅助微孔发泡注塑试验线,并对变模温与型腔气体反压作用下的产品内外泡孔结构演变进行了研究。结果表明,变模温与型腔气体反压辅助工艺单独施加于微孔发泡注塑技术时,对其产品内外泡孔结构均具有双重影响:变模温可以改善产品大部分的表面形貌,但其对填充过程中的熔体发泡影响不大;型腔气体反压可以基本抑制填充过程中的熔体发泡,但却对产品内部泡孔密度有比较明显的降低影响。通过变模温与型腔气体反压的协同控制,可以实现微孔发泡注塑产品表面气泡形貌和内部泡孔结构的良好调控。 相似文献
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基于PLC(可编程逻辑控制器)与MCGS(监视与控制通用系统)组态软件,设计了自动调整臂寿命测试系统.从疲劳试验机的示值不确定度、由标定方给出的相对扩展不确定度、计数器校准时校准源引入的相对扩展不确定度三个方面,合成了疲劳性能的合成相对标准不确定度并转化成绝对不确定度,再使用不确定度评定自动调整臂的寿命.系统能够实现智能控制,记录表征自动调整臂寿命的运转次数.在实际应用中该测试系统运行稳定,不确定度评定方式有助于提高自动调整臂质量. 相似文献
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To improve the mechanical rigidity of the electrocatalyst and assure a higher number density of catalytic sites of the counter electrode in dye-sensitized solar cells (DSCs), we have extended widely applied titanium tetrachloride treatment to construct a rough scaffolding underlayer for the platinized counter electrode. Field-emission scanning electron microscopy and atomic force microscopy images clearly depicted the platinum nanoparticles with a diameter of ca. 10 nm homogeneously distributed on the scaffolding underlayer of the bilayer counter electrode and thus led to a characteristically high surface roughness. The electocatalytic activity of this novel bilayer counter electrode was measured and compared with the corresponding properties of conventional sputtered Pt electrode. Interestingly, electrochemical impedance spectroscopy and cyclic voltammetry measurements further demonstrated the notably larger electrochemical active surface area and thereby higher electrocatalytic activity of the bilayer counter electrode. Consequently, under standard 1 sun illumination (100 mW cm(-2), AM 1.5), device with this bilayer counter electrode achieved a considerably improved fill factor of 0.67 and overall energy conversion efficiency of 7.09%, which was apparently higher than that of 0.60 and 6.37% for sputterd Pt electrode. Therefore, this present method paves a facile and inexpensive way to prepare high-electrocatalytic bilayer counter electrode in DSCs. 相似文献
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高速数粒机控制系统的设计 总被引:1,自引:1,他引:0
根据数粒机工作的流程和精度高、响应快的控制要求,设计了以TMS320F2812型DSP为核心的控制系统,结合线阵CCD和ARM9微型控制器以及配套硬件,对数粒机的生产流程进行控制。介绍了数粒机控制系统的组成、作用、工作原理以及工作流程。其中,药粒计数检测系统和透明胶囊的准确计数是数粒机控制的难点,也是保证数粒精度的基础。给出了数粒机原理、工作流程、系统运行结果和CCD工作时序图,以及自组织竞争型神经网络确定优先级的算法。该控制系统计数准确度高,工作速度快,运行稳定。 相似文献
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Carbon nanotube (CNT) films have been used as counter electrodes in natural dye-sensitized (anthocyanin-sensitized) solar cells to improve the cell performance. Compared with conventional cells using natural dye electrolytes and platinum as the counter electrodes, cells with a single-walled nanotube (SWNT) film counter electrode show comparable conversion efficiency, which is attributed to the increase in short circuit current density due to the high conductivity of the SWNT film. 相似文献
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《IEEE transactions on instrumentation and measurement》1973,22(1):38-41
In many experiments, one is faced with the problem of measuring the time constant of decaying signals. The paper describes a simple electronic system that permits the direct measurement of time constants. The system was used in connection with relaxation experiments on hydrogen and rubidium masers and was found to operate well. The use of a computing counter in the systems gives the possibility of making averages on several experiments and obtaining the standard deviation of the results from the mean. The program for the computing counter is given. 相似文献
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Instead of conventional human counter using NaI(Tl) scintillator in scanning bed geometry, integrated whole body counter was developed. This is constituted by 10 detectors that are located just above the objective organs in order to improve the identification of nuclides. Two sets of p-type arrayed planar HPGe detectors composed of two crystals are used for lungs, and two sets of p-type high efficiency coaxial HPGe detectors are used for gastrointestinal tract. Similarly n-type HPGe is used for chest or thyroid or skull and the other p-types are used for the liver and kidney, respectively. An electric cooling system by adiabatic expansion was adapted as cooling apparatus for all detectors with the object of asphyxia prevention and continuous operation. In the efficiency calibration, Japan Atomic Energy Research Institute (JAERI) phantom with newly designed tissue equivalent lungs, which contain 241Am homogeneously distributed, was applied to lung detector, and Bottle Manikin Absorbtion (BOMAB) phantom regulated by American National Standards Institute (ANSI) was also applied to detectors for trunk. 相似文献