测试105g微阵列式加速度传感器

研究测试10^5g微阵列式加速度传感器的设计与制造。该传感器应用微加工技术制成，具有测试加速度值大、响应速度快等特点。应用非线性回归理论及正交试验分析方法，解决传感阵列的布阵设计；根据理论分析和试验研究，提出了8个传感器位于睛平面内同一圆周上8等分处的布阵，给出了8点图形传感阵列的设计版图；并制造出微阵列式加速度传感器的样品，经测试满足设计要求。     

一种适用于无线传感器网络节点设计的低功耗技术

无线传感器网络集成了传感器、嵌入式计算和通信技术,具有广阔的应用前景。由于传感节点的硬件资源有限,如何采取有效措施降低网络的能耗以延长其工作时间是一个关键的问题。介绍无线传感器网络节点的硬件构成及协议构成,从节点软硬件设计等方面介绍无线传感器网络节点相关的低功耗设计方法。     

液态金属柔性感知的人机交互软体机械手

利用3D打印技术制作了基于液态金属微流道的应变传感器和弯曲传感器，并将应变传感器集成至人体传感手套，用于人手的手势检测；将弯曲传感器集成至软体机械手，用作软体机械手的姿势及运动控制，通过传感手套控制软体机械手实现了人机交互。实验证明传感手套不仅能控制软体机械手的姿势，还能精确控制每根软体手指的弯曲程度。     

基于Arduino的传统医学智能刮痧仪设计

提出了一种基于Arduino集成开发程序的智能刮痧仪设计方案，包括对设计原理、软硬件部分设计及实验结果的介绍。利用压力传感器及姿态传感器监测并记录刮痧仪的速度、压力和姿态等参数，实现对刮痧治疗的数据化。该设计方案切实可行，对于智能传感及测控技术在传统医学方向的应用具有一定的参考价值。     

射流流量传感技术及流量特性研究

基于射流振荡基础的流量传感器的结构原理、主要技术特征、流量测量特征以及传感与信号处理技术.针对射流流量传感器的流量测量特性,提出降低射流计量腔的起振阈值,改进电磁传感原理检测射流振荡信号的方法.     

基于相关检测的电容传感器的研究

介绍了一种高精度的电容传感器，应用相关检测技术，利用集成乘法器AD835来检测电容传感装置电容量的微小变化。这种方法比传统的电容检测传感器精度提高数百倍，而且系统不受外界缓变量的影响。该系统已在纤维检测方面得到很好的应用。     

Ge传感检测科技发布ACCUSOLVE DPF颗粒浓度传感器

通用电气传感检测科技推出新产品ACCUSOLVEDPF颗粒浓度传感器。该传感器是第一款针对降低柴油发动机排放及提高发动机燃油经济性而设计的传感器。ACCUSOLVE可实时监测颗粒填充浓度，同时其设计能够满足道路、非道路以及工业重型柴油机等不同应用中对环境和使用寿命的苛刻要求。这款高精度传感器融入了通用电气传感检测科技的专利技术，在提高柴油机燃油经济性的同时，也能满足重型柴油机以及汽车柴油机的高性能需求。     

面向WSN的土壤盐分、水分、温度传感器的设计

文中设计一款适合WSN(无线传感网络)应用的土壤传感器。传感器采用双脉冲法、基于电容原理的介电法以及热敏电阻分别对土壤盐分、水分、温度信号进行测量。设计为四针式探头,主要包括电源模块,振荡单元,信号的检测、提取和输出单元,静电保护单元,主控芯片及其内部程序等部分。对传感器进行标定和测试,结果表明:传感器稳定性、一致性良好,达到了WSN土壤测量的要求。     

新型可集成的湿度传感器设计与分析

电容性传感器存在难以集成、无法满足高精度测量等问题,文中提出了一种利用SiO_2感湿特性的SPR模型检测湿度的新方法,设计传感器能够弥补电容性湿度传感器的不足,通过SPR对介质折射率变化敏感特性,实现湿度传感。检测结果表明:发出波长为630 nm的P偏振光入射时,传感器的灵敏度高达0.026/%,这一结果对于发展新型微纳传感器提出了新的设想。研究结果为制备高灵敏度可集成湿度传感器提供了理论基础和应用数据。     

霍尔元件在微量振荡天平监测仪中的应用

本文介绍了线性霍尔传感器在微量振荡天平颗粒物监测仪中的应用，设计了频率检测和振荡管保持等幅振荡的控制电路，实现了振荡管固有频率的连续、精确探测。对比实验表明，该仪器设计合理，满足空气质量在线监测的要求。     

Note: vibration reduction control of an atomic force microscope using an additional cantilever

Since an atomic force microscope is used to measure sub-nanometer level precision, it is sensitive to external vibration. If the vibration can be measured by using an additional sensor, we can obtain the vibration-free signal by subtracting the vibration signal from the signal containing the vibration. To achieve a highly effective vibration rejection ratio, it is important to decide where to locate the additional sensor. This is because the vibration measured at the sensing position should have the same phase as that of the vibration in the signal. Vibration reduction control using this electrical sensing method is verified through time domain analysis and topology images of a standard grid sample.     

Note: anti-strong-disturbance signal processing method of vortex flowmeter with two sensors

Some digital signal processing methods have been used to deal with the output signal of vortex flowmeter for extracting the flow rate frequency from the noisy output of vortex flow rate sensor and achieving the measurement of small flow rate. In applications, however, the power of noise is larger than that of flow rate sometimes. These strong disturbances are caused by pipe vibration mostly. Under this condition the previous digital signal processing methods will be unavailable. Therefore, an anti-strong-disturbance solution is studied for the vortex flowmeter with two sensors in this Note. In this solution, two piezoelectric sensors are installed in the vortex probe. One is called the flow rate sensor for measuring both the flow rate and vibration noise, and the other is called the vibration sensor for detecting the vibration noise and sensing the flow rate signal weakly at the same time. An anti-strong-disturbance signal processing method combining the frequency-domain substation algorithm with the frequency-variance calculation algorithm is proposed to identify the flow rate frequency. When the peak number of amplitude spectrum of the flow rate sensor is different from that of the vibration sensor, the frequency-domain subtraction algorithm will be adopted; when the peak number of amplitude spectrum of the flow rate sensor is the same as that of the vibration sensor, the frequency-variance calculation algorithm will be employed. The whole algorithm is implemented in real time by an ultralow power micro control unit (MCU) to meet requirements of process instrumentation. The experimental results show that this method can obtain the flow rate frequency correctly even if the power of the pipe vibration noise is larger than that of the vortex flow rate signal.     

应用于定位的光纤振动传感技术的发展现状

利用光纤作为传感器提取沿途振动信号,通过对检测信号的处理和分析,可有效地检测和定位发生的故障或入侵行为等。分布式光纤振动传感器利用光波在光纤中传输时相位、偏振等对振动的敏感特性,连续实时地监测光纤附近的振动,并能够定位预防事故,有较好的应用前景。根据传感原理,分布式光纤振动传感技术可分为基于干涉原理和基于后向散射探测技术两类。该文主要从以上两个方面综述分布式振动传感器的主要技术和发展动态。     

双端固定音叉式硅微机械谐振器的研究与应用

提出了一种使用双端固定音叉的新型结构的谐振式硅微机械加速度计。它用硅梁侧壁形成的静电电容进行激振，并通过在音叉臂上制作的压敏电阻检测振动。该加速度计输出的是频率信号，具有精度高、抗干扰能力强的优点。探讨了传感器的工作原理，并用有限元方法进行了仿真模拟，结果显示传感器的灵敏度约为2Hz/g。     

内燃机振动信号前端调理模块设计

振动传感器广泛应用于内燃机的监测与诊断之中,但振动传感器的正常工作需要恒流源提供稳定的电流支持,同时,由于振动传感器信号极其微弱、工作环境干扰大,所以振动信号在进入后端数据采集系统之前,需要进行放大、滤波等处理,以满足数据采集系统的要求。介绍了一种内燃机数据采集系统前端调理模块的设计方法,实现了振动传感器恒流源供电、信号滤波的功能,特别是程控放大功能,通过串口通讯,上位机控制调理模块的单片机以设置或读取信号的放大倍数,相比以往开关控制信号的放大更简洁、方便。     

Small diameter fiber Bragg gratings and applications

Small diameter optical fibers are preferred in sensing systems as they have less influence on mechanical performance of smart composite. The static and dynamic monitoring capabilities of the small-diameter fiber Bragg gratings (FBG) are experimentally studied in this paper. Firstly, a small-diameter FBG is used as a strain sensor. Secondly, a temperature sensor is fabricated using a specific FBG. Thirdly, a simple sensing system is proposed in order to discriminate temperature at sensing point. Finally, utilization of these small diameter FBGs for vibration monitoring is discussed. The experiments revealed that the central wavelengths of the small-diameter fiber Bragg gratings shift linearly with strain or temperature. The FBG is more sensitive than a thermocouple inside the thermostat. Acquisition and analysis of the dynamic signal indicates that the designed FBG can be used for dynamic signal monitoring.     

Improved method for shot particle velocity measurement within a shotblasting chamber

This paper presents the application of two axially-spaced impact detecting sensors for correlation-based shot velocity measurement. The sensors were placed directly into the flow of shot particles for sensing the particles’ impact. The implementation of cross-correlation for phase shift determination, however, was not an easy task. Several extensive improvements were necessary, before the original measurement system, already presented in this journal in December 2003, was capable of reliable velocity measurements. This paper presents the development of the system and optimisation of its components. The construction of a sensor built from a small microphone encapsulated in a metal housing and placed under a protective shield was optimised for a high ratio of frontal to side impact signal alteration. High vibration damping was also necessary. It was achieved by the combination of a well-weighted design for supporting elements and by a careful selection of used materials. These measures improved the similarity of the signals generated by the particles’ impact, significantly, and allowed the use of cross-correlation. The accuracy of the obtained results increased drastically by the application of cross-correlation, signal filtering was unnecessary and the signal processing was much faster.     

基于ZigBee的无线振动检测系统设计

针对机械设备的振动信号检测问题,采用ZigBee技术设计了一套无线传感器网络振动检测系统,详细介绍了系统结构,硬、软件设计方案和通信方法。基于Zig Bee技术并结合MEMS传感器开发的无线传感器系统,能够实现无线检测运行机械设备的三轴振动信号,利用Qt框架设计的上位机软件系统可以实现三轴振动信号的波形显示、数据存储以及利用快速傅里叶变换获得的频谱图检测设备的运行状况。实验表明,通过该系统可实时无线检测现场机械设备的振动信号,提高了机械设备故障诊断的自动化水平。     

基于分布式光纤振动传感原理的电力电缆故障定位技术研究

研究一种基于分布式光纤振动传感原理和电缆局部放电原理的电力电缆故障定位技术.通过在电缆上施加高压脉冲,使得电缆上有故障的位置产生局部放电,从而产生振动信号.并将放电脉冲信号同步传输给分布式光纤振动监测系统.通过分布式光纤振动传感技术来探测电缆沿线放电产生的振动信号,并对振动信号进行定位.将该故障定位技术应用于电力电缆沿线上监测电缆故障的状态分布,并进行试验验证.实验结果表明,该系统可实现监测多回路30 km电缆线路的故障分布状况,并对故障点进行准确定位.     

基于载波调制的光纤振动传感复用系统

提出了一种基于载波调制的光纤振动传感复用系统,其优点在于,对于感应外界扰动的不同感应光纤单元产生的干涉信号用不同频率的载波进行调制,相邻载波频率之间的频率差无需大于外界扰动引起的信号基波频率上限的两倍。各光纤感应单元形成的信号被共同的光电探测器检测后,利用信号基波来分析扰动信号的物理量,利用载波基波或谐波的边带判断感应扰动信号的光纤。