共查询到19条相似文献,搜索用时 468 毫秒
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为了检定高准确度位移传感器、几何量计量定位、微细加工测量,同时,也测量那些可以转换为微位移或光程差的其它物理量。基于双光栅干涉仪原理,设计了一种数字式位移传感器,对该装置进行了理论分析和计算机模拟,实验验证:该测量装置的绝对误差不大于0.019μm。 相似文献
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提出一种基于力平衡原理和空气静压技术相结合的非接触式眼压计设计方法.介绍了非接触式眼压计的总体结构、眼压测量模块和外框式气浮垫的设计.其中,眼压测量模块主要包括喷嘴、角膜对准系统及角膜压平光电检测系统,外框式气浮垫采用小孔节流式静压止推气体轴承结构,用于悬浮无摩擦的承载眼压测量模块.对外框式气浮垫的压力分布进行了计算和仿真,对角膜压平光电检测系统和非接触式眼压计的性能进行了测试.实验结果显示:在喷嘴到眼角膜距离为额定距离L的情况下,喷嘴喷出的气体可压平眼角膜,此时光电接收管接收到的光电信号最大,与进口仪器相比眼压测量平均值的绝对误差为1.3 mmHg,研制的非接触式眼压计可实现对眼压的非接触测量. 相似文献
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眼角膜厚度和眼压是眼球的两个重要生理参量,是诊断屈光不正、青光眼等眼科疾病的重要指标.新型复合传感器能一次性完成两个参量的测量.使用这种传感器,可以提高眼科医学诊断的便利性,同时可以根据角膜厚度修正眼压值.通过超声传感器和使用电磁驱动的压力控制系统相结合,实现两种测量的同步完成.超声传感器采用PZT系列压电复合材料,角膜厚度采用超声波脉冲回波法测量.电磁压力控制根据眼压测量的需求,通过计算得到电磁驱动系统的结构参数和电磁参数.由实验测量结果可知,角膜厚度测量精度在±10μm范围内;电磁压力控制系统的压力范围为0~0.490 N,精度为0.0006 N.该复合传感器测量精度和范围符合传统角膜测厚和眼压计的标准,为二合一眼科仪器研制打下基础. 相似文献
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反射式光纤微位移传感器 总被引:6,自引:1,他引:6
依据光纤反射调制原理进行了反射式光纤位移传感检测系统的设计,利用计数器外径千分尺的测头镜面作为反射体和微位移测量工具,详细介绍了微位移测量装置和传感器检测电路。实验表明,在0~2mm范围内检测系统的输出与位移成线性关系,灵敏度为195μV/μm,线性度为±0.5%,适于微位移的测量。 相似文献
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针对传统微位移测量方法步骤繁琐、费时费力、精度差的问题,提出一种基于差动变压原理的闭环微位移测控装置.本装置克服了传统测量方法的缺陷,具有制作简单、操作简便、精度高、线形度好、性价比高等优点.测试结果表明,其各项指标均可达到日常测量要求. 相似文献
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Shing-Hong Liu Chin-Teng Lin 《IEEE transactions on systems, man, and cybernetics. Part A, Systems and humans : a publication of the IEEE Systems, Man, and Cybernetics Society》2001,31(6):676-686
This paper proposes a new noninvasive measurement method for tracking the tendency of mean arterial pressure (MAP) in the radial artery. The designed system consists of a tonometer, a microsyringe device, and a model-based fuzzy logic controller. The modified flexible diaphragm tonometer is to detect the continuous blood pressure waveform and vessel volume pulse. A precise mathematical model describing the interaction between the tonometer and artery is derived. To reach accurate measurement without distortion, a model-based fuzzy logic control system is designed to compensate the change of MAP by applying a counter pressure on the tonometer chamber through the microsyringe device. The proposed control system consists of a linear predictor, a Kalman filter, and a synthetic fuzzy logic controller (SFLC). Simulation results show that, for the real physiologic MAP with changing rates up to 20 or -20 mm-Hg/minute, the model-based SFLC can beat-to-beat adjust the tonometer's chamber pressure to follow the tendency of MAP accurately 相似文献
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A readout circuit for a passive telemetric intra-ocular pressure (IOP) sensor is being developed. The intra-ocular sensor consists of a capacitive pressure sensor in parallel with a planar coil. This inductor–capacitor (LC) resonant circuit transduces the pressure into a shift of resonance frequency. A voltage controlled oscillator (VCO) is used to excite the sensor over a large frequency range (20–40 MHz), hereby detecting resonance of the internal sensor, and thus enabling the measurement of the intra-ocular pressure. This low power circuit is extremely compact, making it suitable for long-term ambulant patient monitoring. The circuit allows wireless readout of the smallest pressure transducers. Tests show promising results at mutual coil distances up to 7.5 mm. 相似文献
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Jia-Jung Wang Chin-Teng Lin Shing-Hong Liu Zu-Chi Wen 《IEEE transactions on systems, man, and cybernetics. Part B, Cybernetics》2002,32(3):306-315
In this paper, a new measurement system for the noninvasive monitoring of the continuous blood pressure waveform in the radial artery is presented. The proposed system comprises a model-based fuzzy logic controller, an arterial tonometer and a micro syringe device. The flexible diaphragm tonometer registers the continuous blood pressure waveform. To obtain accurate measurement without distortion, the tonometer's mean chamber pressure must be kept equal to the mean arterial pressure (MAP), the so-called optimal coupling condition, such that the arterial vessel has the maximum compliance. Since the MAP cannot be measured directly, to keep the optimal coupling condition becomes a tracking control problem with unknown desired trajectory. To solve this dilemma, a model-based fuzzy logic controller is designed to compensate the change of MAP by applying a counter pressure on the tonometer chamber through the micro syringe device. The proposed controller consists of a model-based predictor and a synthetic fuzzy logic controller (SFLC). The model-based predictor estimates the MAPs changing tendency based on the identified arterial pressure-volume model. 相似文献
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为缩短滤棒压降检测分选时间,降低实验人员劳动强度,设计了一种自动化程度高的滤棒压降快速测量分选方法及实验装置.装置采用满足烟草行业新标准技术要求的双通道测量头实现并行检测,流程操控以可编程逻辑控制器(PLC)技术集中控制气路替代复杂的电控部件.集成嵌入式单片机(MCU)芯片和高速ADS8341数据采集芯片实现精密压降传感器信号采集,并计算分析滤棒压降值的分选属性.以双路分选臂实现双通道测量结果的快速分选.实验选用不同标称值的标准滤棒测试装置的精度与重复性,以不同阻值的滤棒进行实验测试,结果表明:装置测量速度超过了600支/h,较单测量头的速度提升了1倍,且不需人工参与.标准棒降压测试精度达到了10 Pa,不同滤棒分选的准确率达到了100%,满足实验检测要求. 相似文献
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放入式电子测压器的校准技术研究 总被引:1,自引:0,他引:1
电子测压器是理想的火炮膛压测试仪器,用经过静态标定的测压器测得的火炮膛压峰值与铜柱测压器测得的峰值相比散布很大.究其原因可能是选用的压力传感器的带宽无法完全覆盖膛压信号的带宽,也可能是火炮发射时的恶劣环境改变了传感器的动态特性.针对上述问题,通过准δ函数校准法得出压力传感器的频响特性完全满足测量膛压的要求.设计了模拟膛压校准装置,能模拟火炮膛内高温高压环境,产生幅值在80 MPa~800 MPa,脉宽在10 ms~20 ms的压力信号.实弹测试数据表明,经过模拟应用环境校准后的测压器所测压力峰值分布稳定性好、置信度高. 相似文献
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飞机在跑道上降落瞬间由于受到较大冲击可能爆胎;针对这一问题,研究了飞机轮胎压力监控系统的总体结构,并分别阐述了系统各个模块的组成原理、具体功能;该系统采用传感器直接测量轮胎压力的方法,将压力信息编码调制,以设定的超高频(UHF)用无线的形式发送出去,压力信息最终显示在驾驶舱显示仪表上;系统可随时测定飞机上每个轮胎内部的实际压力,并可由机组人员给定放气指令在飞机降落前将压力泄放到一个合适的值;测试结果表明,该系统可以对轮胎压力进行精确控制,从而可以有效避免飞机降落爆胎事故的发生,提高飞机安全性. 相似文献