共查询到20条相似文献,搜索用时 203 毫秒
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随着微电子机械系统(MEMS)技术的发展,出现了大量高性价比MEMS传感器,被广泛应用于多个领域。然而惯性测量单元通常包括多个传感器,如三轴MEMS加速度、角速度和磁力传感器,这样要求有多个数据通道输出,给原型系统设计和开发带来不便。基于此,文中设计了一种惯性传感板,集成MEMS三轴加速度传感器、三轴角速度传感器和三轴磁力传感器,通过单个UART串口可以读取9通道数据。经过试验验证,该惯性传感单元能够满足一般原型系统的快速设计和开发。 相似文献
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实用的光纤电流传感器 总被引:1,自引:0,他引:1
提出了一种结构小巧(体积为3cm×4cm×1.5cm)、使用方便的光纤电流传感器.该系统的传感头是以Sagnac干涉仅原理为基础,利用法拉第光学材料作为传感元件,经过巧妙的结构设计构成.传感头不含有任何与们振有关的光学元件,并且待测的信号与光的偏振态和光强的起伏无关,使得该传感系统特别适用于电流遥测使用.初步实验结果和理论结果吻合. 相似文献
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针对TPMS轮胎自动定位中利用场强技术结合双轴加速度实现轮胎自动定位,提出一种利用双轴加速度传感器进行左右轮胎识别的算法,利用该算法结合胎压监测芯片SP40PLUS和加速度传感器设计了TPMS发射模块,并优化了加速度采样频率和识别方向所需的采样点数,最后利用优化的采样频率和采样点数设计了系统控制程序,并且系统控制程序会根据程序运行的不同阶段进入胎压监测芯片相应的省电模式以减少电流消耗。实验结果表明,该算法能够准确快速的识别左右轮胎,在进行的100组数据测试中,该算法对左右轮胎的识别成功率为100%,识别时间会随着车速的增加不断缩短并且在9km/h时的识别时间仅为2.1s。 相似文献
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《电子制作.电脑维护与应用》2017,(19)
针对在现场人工搜索单车时无法准确发现单车数量和位置的问题,提出了一种搜索单车的系统设计方案,能够辅助工作人员寻找到单车。该系统包含了现场的无线传感网单元和远程服务器单元。无线传感网单元由Zig Bee网络和GPRS网络组成。单车内部传感器节点模块的功耗极低,采用纽扣电池供电也能保证长期有效。 相似文献
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提出了《煤矿安全规程》修订应增加矿井移动通信、广播通信、视频监视、人员定位、煤炭产量监测、矿井火灾监控、矿山压力监测、水文监测、远程监控等内容。提出了严禁矿井监控系统与视频监视系统共用信道;矿井有线调度通信系统的电缆必须专用;主干网络应采用具有冗余功能的千兆或千兆以上矿用以太光网络;矿井移动设备和无线接入等应优选WiFi、ZigBee、4G等技术。提出了煤矿安全监控系统和矿井有线调度通信系统等的关键光缆和电缆应分设两条,从不同的井筒或一个井筒的不同位置进入井下;系统光缆和电缆应具有防护措施;底鼓不严重的矿井,系统光缆和电缆应埋入巷道底板与巷帮夹角处。提出了煤矿安全监控系统应具有主要通风机监控、瓦斯抽采监控功能;具有呼吸尘浓度、总粉尘浓度实时在线监测功能;具有风向监测功能;具有瓦斯变化率等分析功能;具有煤与瓦斯突出报警功能;高瓦斯和煤与瓦斯突出矿井应选用全量程和高低浓度甲烷传感器,优选激光或红外甲烷传感器;采用载体催化元件的甲烷传感器、便携式甲烷检测报警仪等甲烷检测设备,必须定期使用校准气样和空气气样调校,每15d至少调校1次;甲烷超限断电功能每15d至少测试1次;高瓦斯和煤(岩)与瓦斯突出矿井的采煤工作面,必须在上隅角设置甲烷传感器,报警浓度为1.0%CH4,断电浓度为1.5%CH4,复电浓度为1.0%CH4等。 相似文献
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Optomechanical uncooled infrared imaging system: design,microfabrication, and performance 总被引:14,自引:0,他引:14
Yang Zhao Minyao Mao Horowitz R. Majumdar A. Varesi J. Norton P. Kitching J. 《Journal of microelectromechanical systems》2002,11(2):136-146
This paper presents the design, fabrication and performance of an uncooled micro-optomechanical infrared (IR) imaging system consisting of a focal-plane array (FPA) containing bi-material cantilever pixels made of silicon nitride (SiNx) and gold (Au), which serve as infrared absorbers and thermomechanical transducers. Based on wave optics, a visible optical readout system is designed to simultaneously measure the deflections of all the cantilever beams in the FPA and project the visible deflection map onto a visible charge-coupled device (CCD) imager. The IR imaging results suggest that the detection resolution of current design is 3-5 K, whereas noise analysis indicates the current resolution to be around 1 K. The noise analysis also shows that the theoretical noise-equivalent temperature difference (NETD) of the system can be below 3 mK 相似文献
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设计给出一种稳定性好、灵敏度高的反射式红外甲烷传感器气室设计过程与测试结果。红外甲烷传感器基于色散型红外吸收光谱法的原理,利用非分光红外探测技术过滤甲烷气体的特征波长以外的光线,再采用双通道补偿技术对气室内部的甲烷气体体积分数进行检测。气室是红外探测器、传输光路、红外光源集成装配体,其结构和性能对器件性能至关重要。气室内壁设计成镀金的旋转抛物面,红外光经抛物面反射成近似平行的光束,该红外光束在气室内部传播过程被气室底盖反射到探测器,增加了甲烷气体的吸收光程,起到了提高气室的灵敏度的作用。设计完成后,经过甲烷环境的测试,反射式气室的稳定性、灵敏度、反应时间等都有良好的表现。 相似文献
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《Computer Vision and Image Understanding》2013,117(12):1659-1671
The interest in automatic surveillance and monitoring systems has been growing over the last years due to increasing demands for security and law enforcement applications. Although, automatic surveillance systems have reached a significant level of maturity with some practical success, it still remains a challenging problem due to large variation in illumination conditions. Recognition based only on the visual spectrum remains limited in uncontrolled operating environments such as outdoor situations and low illumination conditions. In the last years, as a result of the development of low-cost infrared cameras, night vision systems have gained more and more interest, making infrared (IR) imagery as a viable alternative to visible imaging in the search for a robust and practical identification system. Recently, some researchers have proposed the fusion of data recorded by an IR sensor and a visible camera in order to produce information otherwise not obtainable by viewing the sensor outputs separately. In this article, we propose the application of finite mixtures of multidimensional asymmetric generalized Gaussian distributions for different challenging tasks involving IR images. The advantage of the considered model is that it has the required flexibility to fit different shapes of observed non-Gaussian and asymmetric data. In particular, we present a highly efficient expectation–maximization (EM) algorithm, based on minimum message length (MML) formulation, for the unsupervised learning of the proposed model’s parameters. In addition, we study its performance in two interesting applications namely pedestrian detection and multiple target tracking. Furthermore, we examine whether fusion of visual and thermal images can increase the overall performance of surveillance systems. 相似文献
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Daisy S. DaivasagayaAuthor VitaeLei YaoAuthor Vitae Ka Yi YungAuthor VitaeMohamad Hajj-HassanAuthor Vitae Maurice C. CheungAuthor VitaeVamsy P. ChodavarapuAuthor Vitae Frank V. BrightAuthor Vitae 《Sensors and actuators. B, Chemical》2011,157(2):408-416
We describe a compact luminescent gaseous oxygen (O2) sensor microsystem based on the direct integration of sensor elements with a polymeric optical filter and placed on a low power complementary metal-oxide semiconductor (CMOS) imager integrated circuit (IC). The sensor operates on the measurement of excited-state emission intensity of O2-sensitive luminophore molecules tris(4,7-diphenyl-1,10-phenanthroline) ruthenium(II) ([Ru(dpp)3]2+) encapsulated within sol-gel derived xerogel thin films. The polymeric optical filter is made with polydimethylsiloxane (PDMS) that is mixed with a dye (Sudan-II). The PDMS membrane surface is molded to incorporate arrays of trapezoidal microstructures that serve to focus the optical sensor signals on to the imager pixels. The molded PDMS membrane is then attached with the PDMS color filter. The xerogel sensor arrays are contact printed on top of the PDMS trapezoidal lens-like microstructures. The CMOS imager uses a 32 × 32 (1024 elements) array of active pixel sensors and each pixel includes a high-gain phototransistor to convert the detected optical signals into electrical currents. Correlated double sampling circuit, pixel address, digital control and signal integration circuits are also implemented on-chip. The CMOS imager data is read out as a serial coded signal. The CMOS imager consumes a static power of 320 μW and an average dynamic power of 625 μW when operating at 100 Hz sampling frequency and 1.8 V DC. This CMOS sensor system provides a useful platform for the development of miniaturized optical chemical gas sensors. 相似文献
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介绍了一种基于FPGA的红外接收头质量检测系统。系统由红外发射、红外接收、A/D转换、FPGA检测和输出显示等部分组成。本系统能准确而迅速地给出检测结果,达到实时检测的目的。利用FPGA的并行特性,可根据需要进行多路同时检测,满足自动化生产的要求。 相似文献