电动车及蓄电池防盗器的研制

为解决目前市场上电动车防盗器功能单一、误报漏报严重、缺乏灵活性等问题,研制一种电动车及蓄电池防盗器;防盗器以凌阳61单片机为控制核心,基于振动、红外、滚珠开关、霍尔式接近开关4种传感器,依据多条件综合判断实现电动车两级防盗报警;并设计回路破坏报警电路,对蓄电池进行防盗报警保护;设计可撤防与不可撤防两种工作模式,增加防盗器的功能;实验表明防盗器误报率为1.4%,漏报率为0.8%,防盗报警保护效果良好,具有较高的应用推广价值。     

一种汽车防盗远程电子报警器

普通的汽车防盗报警器,是靠声光信号报警．当汽车停放地距车主较远时,就不易被车主发觉;此外,还造成噪声扰民．另一种防盗报警器是利用全球卫星定位系统（GPS）进行防盗,具有车辆定位、反劫报警和网络防盗等优秀功能,但防盗系统复杂,费用高昂,许多人难以承担．本文介绍一款价格低廉、又快速有效的新型远程汽车防盗电子报警器,     

高层建筑物内紫外火焰探测报警器的研制

近年高层建筑物火灾事故发生率明显上升,市面上火灾报警器常见,而检测精度高的紫外火焰探测器和能够及时报警的物联网报警器较为少见,故本文基于紫外火焰探测、短信报警等原理,设计制作了一款紫外火焰探测报警器。选用紫外光电管作为火焰探测传感器,设计自锁电路转为稳定的电信号,并利用短信模块实现远程报警,一旦检测到火焰可在第一时间通过短信远程通知用户。本紫外火焰探测器可检测到5米内、高度大于0.5厘米的火焰,精度可达99.9%,并可瞬时蜂鸣报警,在3秒内发送短信到用户手机。本报警器可应用于家庭、商场、办公室等多种高层建筑的环境中,在火灾初期,及时将消息发送,规避火灾。     

被动式红外线控制器

一、本发明专利的意义 (包括经济效益)和适用范围 被动式红外线控制器(简称控制器)是综合了红外物理、红外光学、微弱信号检测电子等技术研制的一种实用的自动控制类产品.其先进性在于,利用热释电传感器接收人体辐射的红外线这一中红外技术来达到对所需设备的自动控制.例如用于红外辐射防盗报警,灯光的自动照明控制,以及自动门等的控制.并且不需对本控制器作任何结构或电路方面的改进而达到一机多用.为了使仪器在各种场合能很好的适用,并针对现有的报警器使用中存在的误警率高的问题,在控制器电路和光学系统的设计中,我们都作了充分的考虑.…     

专家控制技术在船舶机舱监测报警系统中的应用研究

为提高船舶自动化程度,实现无人机舱,将专家控制技术应用到机舱监测报警系统中;详细阐述了专家控制系统的结构、原理,从受控对象、专家控制器、规则库、推理机四方面介绍了建模过程;并结合结构功能、知识表示、传感数据预处理完成了智能机舱监测报警系统的建立;最后通过大连海事大学开发的DMS-2015轮机模拟器对专家控制型机舱监测报警系统进行了验证,结果表明,该系统的应用,使机舱故障报警更加精确,故障排除更加方便,大大降低了轮机员工作值班的疲劳强度,而且为船舶机舱监测报警提供了一个新思路。     

基于指纹识别与LIN总线的汽车车门系统设计

为了改善传统汽车防盗系统安全性低的问题,提出了一种新型的汽车门门锁控制方法,基于LIN总线网络对车身控制和改进的指纹识别技术来实现。使用L9638作为LIN总线收发器,以ST792F150JDV1QC作为主控节点微控制器,实现LIN网络的通信功能和对网关的控制。针对提高车门指纹识别率问题,提出了Gabor滤波器指纹识别方法,使用八通道的Gabor滤波器对预处理的指纹图像进行滤波,提取指纹图像的指纹特征,使用欧氏距离方法对提取的指纹特征进行匹配。匹配结果经过LIN从节点控制器串行口接收,传递至总线,主节点控制器做出反应,实现门锁的开关。最终对系统实物进行搭建,进行实验测量系统的可行性。     

多站点高空火炬远程监控系统的研究与实现

介绍了ABB可编程控制器(PLC)、昆仑通态触摸屏及杰控上位机在高空火炬点火系统中的应用;该系统采用ABB可编程控制器和昆仑通态触摸屏为控制核心,能实现火炬的手动、自动点火、状态及数据显示、实时报警;通过工业以太网将3个点火子系统连接至监控室计算机,运用杰控上位机软件在监控室实现实时监控、报警、数据查询、打印报表等功能;实际应用表明,该远程监控系统运行稳定、可靠,点火成功率达100%,满足使用要求;PLC、触摸屏和上位机三者的结合在保证点火安全和可靠性的同时也提高了系统的自动化水平。     

利用手机研究简谐运动

利用IOS平台上Sparkvue软件,将iPhone手机应用到弹簧振子和单摆的周期测量实验,在手机屏幕可实时显示测量图像.     

电容感应式隐蔽报警系统的设计与制作

利用电容器的电容值随着极板间介质介电常数而变化的物理性质,设计制作了一种隐蔽式防盗报警系统.其中应用555无稳态振荡器产生随电容值改变而变化的方波信号,经由单片机处理后送至报警器,最终完成监控报警的作用.系统设计简洁精巧,实现了报警系统优良的隐蔽性,误报率低,稳定性与可靠性良好,适应性强,具有广泛的应用前景.     

基于TL494开关电源的设计

开关电源主回路将输入的15VAC电压整流滤波所得的直流电压通过升压斩波电路,变换为25-30VDC输出。主控制器为PIC16F877A单片机。整个系统由整流滤波电路、DC-DC变换器、控制电路、按键显示等模块组成。主控制器和TL494以闭环形式控制DC-DC变换电路,实现输出电压稳定可调。该电源还具有过流保护、自恢复、软启动和短路报警功能。     

Guided-Wave Two-Dimensional Acousto-Optic Scanner Using Proton-Exchanged Lithium Niobate Waveguide

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.     

Femtosecond Transform-Limited Pulse Generation by Compensating for the Linear Chirp of SPM Spectra in Dispersion Shifted Fibers

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.     

Hybrid Wavelength and Code Division Multiple Access in Optical Networks

A review of schemes for multiple access in fiber optic networks shows that a hybrid of wavelength and code division multiple access (WCDMA) combines the best features of both. In particular, the hybrid scheme retains the large information carrying capacity of wavelength division multiple access (WDMA) and flexibility of code division multiple access (CDMA). In this paper WDMA, optical CDMA (OCDMA), and WCDMA networks are discussed. In OCDMA networks, concept of incoherent and coherent coding including inverse decoding and matched filter is introduced. The delay performance of both WDMA and WCDMA networks, under the simple suboptimum access protocols based on cyclic search, is computed. It has been shown quantitatively that tuning delay significantly affects the delay performance of both WDMA and WCDMA networks. Futhermore, delay performance of WCDMA networks is always better than the WDMA networks for the same tuning delay, load, and number of users.     

Effect ofγ-radiation on the spectral luminescence characteristics of impure cadmium tungstate crystals

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.     

Sorting of bending magnets for the SSRF booster

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.     

Measurement of nonlinear coefficient of optical fiber based on small chirped soliton transmission

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.     

Resonance scattering of canonical elastic shells in absorbing fluid medium

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.     

Single-beam self-referenced phase-sensitive surface plasmon resonance sensor with high detection resolution

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.     

Influences of SiO2 protective layers and annealing on the laser-induced damage threshold of Ta2O5 films

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.