提高干涉型光纤传感器灵敏度的一种方法

用独特设计制作的双光纤束,配以高灵敏光电二极管和单板机,可使干涉型光纤传感器在不增加传感臂长度条件下,提高灵敏度四倍。     

压阻式传感器热灵敏度漂移的变压源补偿

介绍了一种压阻式传感器灵敏度温度补偿的基本原理 ,并以加速度传感器为例 ,详细阐述了一种实用的变压源补偿电路。文章分析了整个温控电压源电路的温度特性 ,并给出补偿压阻系数的温度系数随温度变化的方法     

应变式称重传感器灵敏度一致性问题的探讨

叙述应变式称重传感器灵敏度一致性的现状,着重分析了影响灵敏度一致性的因素,提出了达到灵敏度允差指标的方法。     

应用PSPICE软件分析压力传感器的非线性电阻电桥电路

本论文主要讨论怎样利用PSPICE软件模拟压力传感器中由扩散电阻形成的非线性电路。并结合实验结果对模拟结果进行分析,并简要地论述了电桥零点输出电漂移的起因以及如何利用这些结果来消除热零点漂移。     

电阻式湿度传感器的制作方法

现时，用于测量相对湿度的传感器有机械式、电阻式等多种。其中电阻式湿度传感器的感应速度较快，结构较紧凑，而且适应性也优于机械式传感器。其代表性产品如磺化聚苯乙烯薄膜式湿度传感器。就现有的电阻式湿度传感器而言，多采用与敏感层粘着方式，相互保持一定间隔，对所配置的一对薄电极间的电阻变化进行测量。一般感湿层的电阻都很高，或增大电极的对向面积，或缩小电极的间隔，以     

一种阵列电阻传感器的电阻检测电路设计

柔性电阻阵列传感器在生物信息检测领域有着巨大的应用,但由于阵列电阻间串扰的存在,使得该类传感器检测精度大大降低,本文基于等电势屏蔽方法设计实现了一种针对于阵列电阻检测的高准确性可变精度的检测电路,并通过Multisim进行阵列电阻检测仿真,经过仿真验证该电路最高可实现1%精度的阵列电阻检测。     

由镜像电流源实现差动电阻式传感器测量的一种新方法

针对现有的差动电阻式传感器不容易获得高精度测量结果的现实情况,提供了一种新型测量方法,通过引入一对镜像电流源,在原理上直接实现了电阻直流分量和交变分量的有效分离,信号处理时可以实现仅对交变分量的提取和放大,因此可以获得非常理想的测量灵敏度和测量精度。     

压电双晶片传感器灵敏度特性分析

本文用模态分析法详细分析了压电双晶片力、振动、粗糙度传感器的位移特性及灵敏度特性,并给出了灵敏度与压电材料参数及晶片几何尺寸的关系。     

电阻式湿度传感器的系列化设计及其应用

介绍一种电阻式湿度传感器的系列化设计方法、线化措施及应用实例。     

电阻型氢气传感器研究进展

该文介绍了电阻型氢传感器国内外研究的最新进展,对该类传感器的工作原理和改进方法进行了详细的叙述,对半导体型和纳米线电阻型传感器的研究作了详细的介绍,并展望了电阻型氢气传感器的发展方向.     

一种基于地磁感应的车型分类算法*

地磁传感器是近年来出现的新型路面车辆检测器,而车型分类是车辆检测器的一项重要功能。根据地磁传感器的性能特点,提出了一种车型分类算法。该算法首先从原始数据中提取特征,进而对特征数据进行聚类以确定检测器的最佳分类能力,最后以“离线训练,在线分类”的策略,利用神经网络进行实时的车型分类,在不过度增加硬件负担的情况下获得了比较好的效果。该算法有助于提高地磁车辆检测器的性能,从而为交通管控系统提供更丰富的基础数据。     

声表面波气体传感器振荡电路设计

基于反馈振荡器的工作原理,采用对振荡电路的开环增益和相位进行检测和调节的方法,设计制作了用于声表面波(SAW)气体传感器的振荡电路。根据开环测量的结果,通过改变匹配电感值来使得0°相位在增益峰值附近,以获得稳定的振荡和提高振荡器可承受的最大传感器插损。在印制电路板(PCB)版图设计中,采用50Ω特性阻抗和保证最短RF回流电流路径等措施以实现稳定的振荡。基于上述方法,分别制作了频率为315,433.92 MHz的振荡电路。后者的噪声幅度在20 Hz以内,标准方差约为3.92。该实验结果表明:此设计方法具有快速、便捷、可靠的优点,设计的振荡电路具有较高的稳定性,可广泛用于SAW传感器设计。     

振弦式传感器的频率敏感机理与应用

分析振弦式传感器的频率敏感机理,理论上说明这类传感器的传感原理。论述这类传感器使用过程中的关键———激振方式选择的理论依据。比较2类振弦式传感器的特点及使用要点,理论推导和实际运用结合起来,实际使用说明了理论分析的正确性。     

Development of high sensitivity tin oxide based sensors for gas/odour detection at room temperature

An effort has been made to develop thick film tin oxide gas sensors which could detect various gases/odours at room temperature. To achieve this, the fabricated sensors were annealed in oxygen plasma for various durations. It was then found that, the room temperature sensitivity of such sensors was increased to about ten times as compared to the sensitivity of the non-annealed sensors. Further, plasma annealed sensors are found to be practically independent of temperature and the room temperature sensitivity of these sensors are found to be about 1.5 times the sensitivity of the conventional sensors at its operating temperature of 300°C. Studies on the variation of d.c. resistance, sensitivity, temporal response, current–temperature characteristics and impedance spectroscopy with the annealing time have also been made. These studies reveal that, with the increase in annealing time, there is a permanent gradual reduction in the d.c. resistance of annealed sensors. Further, it is also observed that with the increase in annealing time, the response time improves, barrier height reduces, barrier capacitance increases and the dependence of the sensitivity with temperature reduces while the sensitivity itself improves many-fold.     

气体传感器在感度测试自动鉴爆中的应用

针对感度测试自动鉴爆的要求,选用合适的气体传感器,组建测试系统,实时采集感度试验时特定气体的生成量,进行预处理和特征量提取,再利用BP算法在线进行计算,根据鉴别准则进行鉴别。试验证明:提出的方法能实现爆炸鉴别的自动化,操作简单、识别率高。     

Comparative study on directional sensitivity of patch‐antenna‐based strain sensors

In this article, we present a comparative study into the directional sensitivity of patch‐antenna‐based strain sensors. Two linearly‐polarized (LP) patch sensors vs a circularly‐polarized (CP) patch sensor with identical configurations are demonstrated. The strain occurred in real structures is commonly uncertain, the usefulness of LP‐patch sensor becomes limited. Like the conventional strain gauges, it can only be used if the strain direction is known beforehand. Therefore, a nearly‐square CP‐patch sensor for multi‐directional strain monitoring is proposed here. In order to obtain high sensitivity, three novel strain sensing methods are proposed for strain monitoring. Multi‐directional strain sensing is achieved by a proof‐of‐concept prototype. The simulated results verified by experimental results show that high sensitivities of these three methods were achieved.     

Direct interface circuit to linearise resistive sensor bridges

This paper proposes the direct connection of different configurations of resistive sensor bridges to a microcontroller without any intermediate active component. Such a direct interface circuit relies on measuring the discharging time of a RC network that includes the resistances of the sensor bridge. For quarter-, half-, and full-bridge circuits, we combine the discharging times to estimate the fractional resistance change x of the bridge arms. Experimental results for half- and full-bridge circuits emulated by resistors yield a nonlinearity error below 0.3%FSR (full-scale range) for x between 0 and 0.1 and an effective resolution of 11 bit. Measurements on two commercial magnetoresistive sensors yield higher nonlinearity errors: 1.8%FSR for an AMR (Anisotropic Magnetoresistive) sensor and 5.8%FSR for a GMR (Giant Magnetoresistive) sensor, which are mainly due to the nonlinearity of the sensors themselves. Therefore, the nonlinearity of the measurement is limited by the sensors, not by the proposed interface circuit and linearisation algorithm.