共查询到20条相似文献,搜索用时 46 毫秒
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介绍了一种TDR型液位测量系统,系统推广了TDR(时域脉冲反射)技术,通过监测反射信号的变化,实现液面水位的动态监测.并对采集信号的实时预处理采用了小波滤波和冗余采样率法,提高了系统的在线测量精度.介绍了测距原理、系统构成、采样数据预处理方法.软件界面采用Dephi7高级语言编程,并通过基于Dephi调用Matlab的方法对采集数据进行处理.实验结果表明:系统具有较高的测量精度,可靠性高. 相似文献
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《仪器仪表与分析监测》2017,(1)
为了解决电缆故障定位精确度不高的问题,设计了一种基于FPGA的电缆故障检测系统,采用低压脉冲反射法,借助QuartusⅡ软件提供的锁相环PLL控制低压脉冲交叉收发隔离电路产生纳秒级窄脉冲作为脉冲源。详细论述了低压脉冲反射法的设计原理、硬件结构框图以及模块内部设计原理图,采用基于FPGA的全同步数字测频模块化设计,大大提高了检测系统的可靠性,优化了检测系统的综合性能。实验数据表明,该检测系统构成的实验平台可以适应不同长度数传电缆故障点的测量,满足现场测试要求。 相似文献
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为了解决发射率长时持续测量中的温度补偿问题,介绍了一种发热物体表面发射率的在线测量方法.其系统由半球反射罩、半球吸收罩、热电堆探测器和补偿用各测温元件等组成.文中详细分析了基于转换黑体法的发射率测量中的误差补偿问题,建立了合理可行的补偿模型,消除了反射罩、吸收罩和探测器冷端温度变化带来的影响,从而实现发射率的长时持续在线实时测量.通过对实验室标准样板进行对比实验,证实该方法切实可行,具有较好的应用前景. 相似文献
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电磁波反射测长系统的设计 总被引:1,自引:0,他引:1
对电磁波在传输线中的测长理论进行了分析,设计了一种电磁波反射测长系统.该系统由单片机控制,使用锁相倍频技术产生1 200 MHz高频参考时钟,采用脉冲计数原理,实现对发射脉冲与反射脉冲时间间隔的精确测量,在波速已知的情况下,得到被测电缆长度.实验结果表明,该系统具有较高的精度,可以被广泛的应用于电缆长度测量领域. 相似文献
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针对矿井高压电缆的老化机理进行分析,发现局部放电脉冲信号可直观的反映出电缆的老化程度.利用差分法搭建耦合装置测量电缆局部脉冲信号,通过小波阈值去噪法,对测量到的脉冲信号进行去噪,提高数据的精确度,搭建在线监测系统,对数据采集模块与信号传输模块进行选型设计,利用光纤通讯网络将信号传输到上位机,实现高压电缆绝缘状态的远程在线监测与诊断,并为电缆的检修与更换提供数据参考. 相似文献
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《机电产品开发与创新》2017,(6)
介绍了基于可编程片上系统PSo C 1的电池内阻检测模块的设计思路与实现过程。以PSo C 1为控制核心,采用脉冲直流放电法测量电池内阻,提出一种便利、低功耗的在线检测蓄电池内阻的设计方案。阐述了利用片内模拟和数字外设构成系统的软硬件设计。模块使用被动应答的方式与主机通信,实现低功耗的在线检测。 相似文献
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A new in-process and non-contact probe is proposed to measure the diameter and the roundness of turned workpieces. The initial probe discussed in previous publications exhibited diameter measurements with good accuracy (uncertainty 5 μm over 100 mm). This paper discusses the implementation of roundness measurement into the initial probe and its performance. The principle of the roundness measurement is based on the relationship between the displacement and the light intensity. The probe delivers a maximum error of 0.5 μm with an uncertainty of 1 μm for roundness measurement over a range of 100 mm diameter. 相似文献
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从激光式测量和影像式测量这两大类非接触测量出发,运用非接触测量机开展测量工作,得到了一个完整的非接触测量流程,并且对测量不确定度进行了分析,最终建立了一套完整的非接触测量规范,并通过相关的实验验证了该规范的可行性。 相似文献
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纳米测量技术研究的若干进展 总被引:3,自引:0,他引:3
对纳米测量的长度测量、粒度测量、测量标准、测量仪器及其与计算机通讯及网络技术的结合等方面进行了讨论,并对纳米测量国际学术会议及纳米测量的有关技术进行了综述。 相似文献
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The production and transport of liquid and gaseous hydrocarbons have always been the object of studies to improve technologies and procedures, as they involve large volumes and high-value goods. There are several procedures, rules and regulations applied to the measurement of fluid flow, but its applicability may involve significant operating costs. The balance between requirements and costs led to the use of gauge pressure transmitters instead of absolute pressure gauges and assuming a constant atmospheric pressure value for parameterization of compensation algorithms. This solution simplifies the calibration process but can potentially impact measurement uncertainties because atmospheric pressure is not constant. This work quantifies these impacts and concludes that, for gas systems operating below 2000 kPa, the use of absolute pressure transmitters or the incorporation of in-line atmospheric pressure gauges is recommended. Above this value, the effects of atmospheric pressure variation do not have as much impact, but even in these cases the final uncertainty estimate of the measured gas volume must consider this source of additional uncertainties. 相似文献
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The paper analyses the concepts of intelligent measurement and instrumentation in relation to artificial intelligence. It describes examples of the application of intelligent measurement in clinical medicine: in particular, inferential measurement, the learning of patterns and measurement interpretation and its use in decision support in the total medical information system. 相似文献