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为了能够对某型号无人机雪橇式减震器的最大静载荷试验进行实时检测和保存数据,设计了一种基于STM32F103ZET6单片机的雪橇式减震器检测设备。设备利用压力传感器和光栅尺分别完成减震器在压缩过程中,对静载荷与压缩距离的采集并转换为数字信号,信号在减震器压缩过程中的特定位置被采集,将采集到的信号通过无线模块上传至上位机;以C#平台开发的上位机作为收集、处理下位机传入的静载荷、压缩距离的信号,最后借助图形用户接口控件实现静载荷、压缩距离的曲线显示,将采集到的数据使用SQL数据库实现保存,以便于操作管理员读取和历史查询。测试结果表明:雪橇式减震器检测装置可以完成对减震器的自动化检测。 相似文献
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为了能够对煤层开采时的压力进行实时监测和数据保存,设计了一种基于STM32F103ZET6的嵌入式高精度多路压力采集系统;利用压力传感器和18位模数转换器FS511完成煤层压力的采集并转换为数字信号,通过数字开关CD4051实现通道转换,以实时操作系统μC/OS-II作为软件平台,处理压力数据,借助图形用户接口μC/GUI实现压力数据和曲线的显示,借助文件系统FATfs实现以文件的形式将数据保存在SD卡中,便于PC读取;利用CAN总线将数据传输至上位机,进行更为复杂的处理;测试结果表明:煤层压力监测系统精度达到0.01%;本系统精度高,实时性好,满足了矿山压力实验室的需求。 相似文献
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设计了一款的RFTR1无线火灾监测报警系统,重点介绍系统的实现过程。系统以单片机STC12C5A60S2为核心控制器,利用LabVIEW开发环境设计上位机的监测界面,上位机通过串行口与单片机通信,从而实现对多路数据的采集与监测。设计并解释系统的硬件连接,对系统作软件设计,解释了LabVIEW监测平台的应用,经测试系统运行正常。系统具有无需布线、对功能变化的适应性强、系统数据及信息显示直观、人机交互界面好、抗干扰能力强、安装调试简便等特点。 相似文献
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传统的分布式温度监控方法存在费时费力、不便应用在特殊环境、不便用于多点融合监控等弊端,设计并实现了新一代DCS智能温度监控系统,通过核心为ARM7LPC2292芯片的下位机及时调整全部温控点的温度,自主设置温度、显示实际温度与报警;采用核心为89C51微处理器模块,将上、下位机的信息互相传递,确保上位机随时查询温度信息;通过CC2530终端节点实时采集测温终端的温度数据,将温度数据无线发送给CC2530协调器节点,不在采用传统的中转服务器方式,而是采用协调器节点通过串口与上位机进行通信,并在上位机中进行温度数据的处理和存储。软件设计过程中,对系统监控过程中上位机和下位机间的主从通信方式进行详细分析,并给出了系统温度监控数据通信传输的流程图,分析了系统实现温度监控的数据库访问代码以及温控曲线显示代码的设计。实验结果说明,所设计系统性能好、操作简单、控制准确率高。 相似文献
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某型瞄准线稳定测试系统是用于测试和检验班组武器系统、轻型低空反导转管机枪等武器系统中的光电跟踪子系统瞄准线独立性能的专用设备;介绍利用LabWindows/CVI实现上位机与下位机之间的通信,设计了瞄准线稳定测试系统,分析了下位机需要实时检测的物理量信息;为了提高系统的可视性和实现对下位机的控制,通过RS232串行通信技术向上位机传输数据;对上位机利用LabWindows/CVI的控件实现数据采集,数据显示和存储进行了研究;实验结果表明,基于LabWindows/CVI的RS232串行通信的上位机数据采集与显示系统具有可视性强、操作简单等特性。 相似文献
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针对传统有线USB设备测试系统存在布线、单目标、通用性差等缺陷,设计一套基于LabVIEW的USB设备无线测试系统;系统以LabVIEW为软件开发平台,进行虚拟仪器前面板设计与后台程序的编写;利用无线数据收发模块及其余硬件设备,搭建上位机与设备间无线数据通讯的桥梁;以宏晶STC12C5A60S2单片机为核心控制器,通过引入USB总线接口芯片CH375扩展了USBHOST功能,从而实现上位机和USB设备间数据的无线采集与传输;本系统主要应用于对USB设备的开发调试和测试过程。 相似文献
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Guided-Wave Two-Dimensional Acousto-Optic Scanner Using Proton-Exchanged Lithium Niobate Waveguide 总被引:1,自引:0,他引:1
Two-dimensional scanning of a 0.6328 mum guided-light beam has been realized using noncolinear acousto-optic (AO) coplanar Bragg diffraction together with colinear AO guided-mode to substrate radiation-mode conversion in a Z-cut Xpropagation LiNbO3 proton-exchanged (PE) waveguide. The two surface acoustic (SAW) waves utilized are at the center frequencies of 500 and 200 MHz, propagating in the Y and X axes, respectively. Two-dimensional scanning of approximately 720 resolvable light beam spots, namely, 18 40 (horizontal vertical) scanning, has been demonstrated using a light beam of 1.0 mm aperture. The total number of resolvable beam spots can be greatly increased from 720 by simply utilizing SAW transducers of larger bandwidth and a light beam of greater aperture. It should also be possible to significantly increase the diffraction efficiency from 3 % by optimizing the parameters of the PE waveguide and the SAWs. 相似文献
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S. G. Nedel’ko M. A. Krysyuk A. L. Apanasenko L. N. Lymarenko Z. T. Moroz 《Journal of Applied Spectroscopy》1997,64(1):55-61
Results of a study of the effect of γ-radiation on the spectral luminescence properties of cadmium tungstate crystals doped
with silver, bismuth, and molybdenum cations are presented. Spectral characteristics of the nondnnnoped crystals are briefly
described. Absorption and photo and X-ray luminescence spectra of the crystals taken before and after exposure to γ-radiation
(5.5·104 Gy) are compared. It is found that the spectral characteristics of the crystals doped with silver, bismuth, and molybdenum
cations do not change markedly after the exposure. The relation between the type of impurity-induced defects, individual characteristics
of the impurity cations, and the character of the effect of γ-radiation on the spectral luminescence properties of impure
crystals is analyzed (preliminarily).
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 64, No. 1, pp. 55–60, January–February, 1997. 相似文献
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A simple technique of pulse compression, based on the linear chirp compensation of self-phase modulation (SPM) spectra in dispersion shifted fibers, is demonstrated. The optimization procedure is carried out, for a short span of a single-mode fiber, using a parabolic law, which describes the behavior of the squared output pulse width versus the pump peak power in the case of Gaussian pulses. The experimental results give a minimum pulse duration of 233 fs, which is in good agreement with the model. Shorter and coherent pulses, down to 90 fs, have been obtained by inserting an interference filter at the optical output. 相似文献
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The Shanghai Synchrotron Radiation Facility(SSRF)booster ring,a full energy injector for the storage ring,is deigned to accelerate the electron beam energy from 150MeV to 3.5GeV that demands high extraction efficiency at the extraction energy with low beam loss rate when electrons are ramping.Closed orbit distortion(COD)caused by bending magnet field uniformity errors which affects the machine performance harmfully could be effectively reduced by bending magnet location sorting.Considering the affections of random errors in measurement,both ideal sorting and realistic sorting are studied based on measured bending magnet field uniformity errors and one reasonable combination of bending magnets which can reduce the horizontal COD by a factor of 5is given as the final installation sequence of the booster bending magnets in this paper. 相似文献
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We measure the waveform and phase curves of short optical pulses before and after transmission over different lengths of fibers by use of the pulse analyzer with the frequency-resolved optical gating (FROG),and numerically simulate pulse evolution under the experimental conditions.The nonlinear coefficient of the fiber is given by comparing the experimental results with the numerical ones.Difference between the experiment and numerical simulation is analyzed. 相似文献
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Resonance scattering of elastic spherical shell and cylindrical shell while the surrounding fluid medium has absorption is studied. The normal mode solution derived using exact elastic theory and the separation of variables is still applicable. However, the scattering form function has to be modified for the absorbing medium, otherwise the unreasonable result would be obtained. The backscattering form function in the absorbing medium is redefined, and the form function of elastic spherical and cylindrical shell with vacuum or solid matter filled is calculated in various absorption conditions. The results show that the absorption of surrounding fluid leads to notable attenuation of the coincidence resonances in the mid-frequency, but it has a little influence on the low-frequency resonance scattering induced by the filler inside the shell. 相似文献
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A versatile and low-cost single-beam self-referenced phase-sensitive surface plasmon resonance(SPR)sensing system with ultra-high resolution performance is presented.The system exhibits a root-mean-square phase fluctuation of ±0.0028.over a period of 45 min.i.e.a resolution of±5.2×10-9 refractive index units.The enhanced performance has been achieved through the incorporation of three design elements:a true single-beam configuration enabling complete self-referencing so that only the phase change associated with SPR gets detected,a differential measurement scheme to eliminate spurious signals not related to the sensor response,and the elimination of retardation drifts by incorporating temperature stabilization in the liquid crystal phase modulato .Our design should bring the detection sensitivity of non-labeling SPR biosensing closer to that achievable by conventional fluorescence-based techniques. 相似文献
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Ta2O5 films are prepared on BK7 substrates with conventional electron beam evaporation deposition.The effects of SiO2 protective layers and annealing on the laser-induced damage threshold (LIDT) of the films are investigated.The results show that SiO2 protective layers exert little influence on the electric field intensity(EFI)distribution,microstructure and microdefect density but increase the absorption slightly.Annealing iS effective on decreasing the microdefect density and the absorption of the films.Both SiO2 protective layers and annealing are beneficial to the damage resistance of the films and the latter is more effective to improve the LIDT.Moreover,the maximal LIDT of Ta2O5 films is achieved by the combination of SiO2 protective layers and annealing. 相似文献
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Yepeng Guan 《中国光学快报(英文版)》2008,6(6)
Gray cross correlation matching technique is adopted to extract candidate matches with gray cross correla- tion coefficients less than some certain range of maximal correlation coefficient called multi-peak candidate matches. Multi-peak candidates are extracted corresponding to three closest feature points at first. The corresponding multi-peak candidate matches are used to construct the model polygon. Correspondence is determined based on the local geometric relations between the three feature points and the multi-peak candidates. The disparity test and the global consistency checkout are applied to eliminate the remaining ambiguous matches that are not removed by the local geometric relational test. Experimental results show that the proposed algorithm is feasible and accurate. 相似文献