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利用ZnS…Cu电致发光粉末与环氧树脂胶混合,设计制作了一种梯形电极结构的电压传感单元,实现了电致发光电压传感器输出信号的温度漂移补偿。电致发光电压传感信号通过2根塑料光纤传输到2个硅光电探测器,并选择其开路电压作为传感器的输出信号。在同一外加电压条件下,梯形电极区域内的电场分布是不均匀的,因而不同场点的发光亮度不同。通过测量梯形电极区域内2个不同发光点的发光强度随外加电压的变化,并对两路输出电压传感信号进行数据拟合与计算,可获知被测电压的有效值,并可实现对输出信号温度漂移的补偿。在-40~60℃范围内,采用上述温度漂移补偿方法测量了有效值在0.7~1.5 k V范围内的工频电压,传感器输出信号的非线性误差低于1.6%,验证了该温度漂移补偿方法的有效性。 相似文献
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在工业生产过程中电子皮带秤普遍采用多个称重传感器输出信号的并联方法,而该方法对多个称重传感器无法独立采集同时无法准确判断故障。应用TI公司MSC1210单片机最小系统和信号分离器,设计一种并联传感器系统压力传感器故障诊断系统,实现多个称重传感器并联应用时的独立采集;发明一种皮带秤称重传感器累计量校准方法,将不断变化的累计量转换成定量值实现并联传感器系统压力传感器故障诊断。结果表明该系统较好实现多个称重传感器的独立采集和故障传感器判断,为皮带秤等计量装置并联传感器系统的技术升级提供有效手段。 相似文献
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针对大量湿度传感器出厂或使用前需要定标或进行误差补偿的技术需求,本文基于C#语言和SQL数据库技术,构建了一种采用传感器融合算法的大批量湿度传感器数据自校准平台。首先通过饱和盐溶液构建标准湿度环境,然后通过MT4080D数字电桥对待校准湿度传感器进行多次测量,之后把测量值矩阵和标准值导入基于最小二乘和加权融合算法的平台进行处理,得到不同固定点湿度环境下传感器标定和补偿的校准数据。该设计实现了操作简单,成本低廉,响应时间短,运算速度快的湿度传感器的软件校准算法平台,具有一定实际应用价值。 相似文献
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霍尔传感器作为一种半导体器件,其灵敏度随着温度变化而产生漂移的特性,限制了其在高精度磁场测量场合的应用。传统的温度补偿方法虽然对温度变化的一次项进行了完全补偿,但是却引入了温度变化二次项的误差。因此,对于温度变化显著的高精度测量场合,传统温度补偿法将不再适用。设计了一种闭环反馈电路,通过温度传感器采集温度信号,与信号处理电路的最终输出信号进行运算后送回信号处理电路的输入端进行补偿,而并不是简单地将温度信号与霍尔信号的输入信号进行相加后送入信号处理电路。仿真分析结果表明,通过调节补偿电路的反馈比例系数与霍尔芯片温度漂移系数,可以完全补偿霍尔芯片的灵敏度漂移。因此,这种闭环补偿方法可以不引入与温度变化二次项有关的误差,消除因温度变化产生的漂移,不仅适用于霍尔传感器,也适用于其他会随着温度漂移的传感器。 相似文献
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韦尔代常数(Verdet)是决定光纤电流传感器(FOCT)灵敏度的重要因素之一。根据萨格纳克(Sagnac)干涉原理计算得到校准信号,并测量FOCT的实际输出信号,通过比较这两组信号建立目标函数,基于单纯形算法进行参数优化,从而得到石英光纤的韦尔代常数。实验结果与经典模型计算结果基本吻合。FOCT的输出信号经过测量电路会引入相位差;另外受到调制器和外界环境的影响,干涉回路的工作点会产生漂移,导致输出信号不对称而产生直流量。考虑到以上因素,提出的这种方法还能同时测量出电路的相位差、干涉回路的工作点以及反映非线性畸变的直流量。 相似文献
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基于F-P腔和FBG的强度调制型光纤液位传感器 总被引:1,自引:0,他引:1
设计了一种用于液位测量的光纤F-P(Fabry-Perot)传感器,并从传感头的设计制作出发,讨论了提高传感器输出信号对比度的方法;测量系统采用宽带光源,解调时经FBG(Fiber Bragg Grating)反射和透射得到传感信号和参考信号,对两路光强信号进行联合处理,补偿了光源功率波动和光路损耗变化引起的不良影响,消除了强度调制型传感器的固有缺点,此方法具有结构简单、成本低的优点;该系统可进行连续测量,测量范围为0到200kPa,相当于测量水深0到20m,其分辨力小于1cm(水面高度变化),特别适合对易燃易爆的环境中的油库液位进行测量。 相似文献
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本文根据半导体GaAs材料带隙随温度变化的原理,对采用单根光纤作双向传输光信号的反射光纤温度传感器进行了试验研究。由微型计算机控制的光纤测温系统的测温范围为0~150℃精度±1℃,分辨率0.2℃。 相似文献
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《Physics letters. A》2014,378(30-31):2184-2190
The electronic sensitivity of pristine, Ni- and Si-doped graphynes to ammonia (NH3) molecule was investigated using density functional theory, including dispersion correction. It was found that NH3 is weakly adsorbed on the sheet, releasing energy of 2.9–4.4 kcal/mol, and the electronic properties of the sheet are not significantly changed. Although both Ni-doping and Si-doping make the sheet more reactive and sensitive to NH3, Si-doping seems to be a better strategy to manufacture NH3 chemical sensors because of higher sensitivity. Our calculations show that the HOMO/LUMO gap of the Si-doped sheet is significantly decreased from 2.13 to 1.46 eV after the adsorption of NH3, which may increase the electrical conductance of the sheet. Therefore, the doped sheet might convert the presence of NH3 molecules to electrical signals. Moreover, the shorter recovery time of the Si-doped sheet is because of the middle adsorption energy of 39.3 kcal/mol in comparison with 55.1 kcal/mol for the Ni-doped sheet. 相似文献
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Mustapha Remouche Rabah Mokdad Ayoub Chakari Patrick Meyrueis 《Optics & Laser Technology》2007,39(7):1454-1460
Curvature of a multimode integrated optical waveguide reduces the numerical aperture and induces radiation losses. In this paper, we study this phenomenon and we present a geometrical approach to calculate the local numerical aperture and the intensity attenuation. We exploit the bending effect on the local numerical aperture to make a new intrinsic temperature sensor. The simulation results are validated for the silica/silicone integrated optical case. The principal performances of the silica/silicone temperature sensor are the extended temperatures range (−50 to 200 °C) with an excellent linearity response (1%) between 20 and 200 °C. 相似文献
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《Current Applied Physics》2018,18(7):810-818
Preparation and applications of nanoporous gold (NPG) were reviewed. Various preparation methods of NPG and its structure were first discussed. Then, two basic characterization methods for morphology and surface area of prepared NPG structures were discussed. As for applications of NPG, studies regarding catalysts and sensors were surveyed. First, for catalysis, CO oxidation and hydrogen oxidation were reviewed. Regarding CO oxidation, detailed studies on reaction mechanisms and density functional theory (DFT) calculations were also discussed. For hydrogen oxidation, the effect of adding metal oxide nanoparticles on NPG was discussed. As for sensor applications, non-enzymatic and amperometric electrochemical sensing of aniline and phenol were reviewed. Due to its nanostructures, NPG had superior properties of antifouling effect and enhanced response signals and good enough stability that enabled amperometric sensing. 相似文献
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光纤法布里-珀罗干涉式应变的测量 总被引:6,自引:0,他引:6
本文采用在一段单模光纤两端镀膜的方法构成不对称光纤法布里-珀罗干涉腔,导出此干涉腔反射光的数学模型,给出干涉腔与光纤连接构成干涉式光纤应变传感器的一般理论和测量方法。文中传感器采用低反射率的法布里一纳罗腔以改善光纤应变传感器的线性。输入、输出在同一侧便于使用;与电阻应变传感器相比精度高、适用范围广。 相似文献
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Abstract This paper describes the recent progress in research and development of fiber optics in Japan. A review is presented of recent developments in fiber manufacturing, cabling, and fiber splicing. Experimental results are given for an optical communication system with optoelectronic components. Theoretical analysis and fundamental experiments are not included, nor are research activities in such devices as lasers or in such applications as those in medical fields. Transmission characteristics of optical fibers—in particular loss and pulse spreading—are assessed from the viewpoint of their structures. Various methods of fiber strengthening and structuring cables are described from the viewpoint of mechanical strength. Coupling efficiencies of detachable connectors and methods of permanent fiber splicing are described. Experimental results on optical fiber communication systems are presented and coupling techniques between a light source and an optical fiber are described. 相似文献
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A metamaterial absorber (MA) based sensor is designed and analysed for various important applications including pressure, temperature, density, and humidity sensing. Material parameters, as well as equivalent circuit model have been extracted and explained. After obtaining a perfect absorption (PA) at around 6.46 GHz and 7.68 GHz, surface current distributions at resonance points have been explained. Since bandwidth and applicability to different sensor applications are important for metamaterial sensor applications, we have realized distinctive sensor demonstrations for pressure, temperature, moisture content and density and the obtained results have been compared with the current literature. The proposed structure uses the changes on the overall system resonance frequency which is caused by the sensor layer’s dielectric constant that varies depending on the electromagnetic behaviour of the sample placed in. This model can be adapted to be used in sensor applications including industrial, medical and agricultural products. 相似文献
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Synthesis, characterization and fluorescence studies of a novel europium complex based sensor 总被引:1,自引:0,他引:1
A novel europium(III) complex was synthesized using TTA (α-thenoyltrifluoroacetone) as the first ligand and H2bpdc (2,2′-bipyridine-3,3′-dicarboxylate) as the second ligand. Elemental analysis, thermal analysis, IR and UV–vis spectrum and fluorescence spectrum of the europium(III) complex were carried out. A characteristic Eu3+ fluorescence emission was observed in ethanol–water (1:1) solution, indicating that the complex is stable in solution and the emission of Eu(III) ions was not influenced by the water molecules. The fluorescence emission of the complex was quenched completely by the Co2+ and Fe3+ ions, but the quenched emission was recovered in the presence of glycine. Moreover, the Eu3+ emission was very sensitive to pH, so the complex can be used as pH-dependent fluorescence probe or chemosensors. 相似文献