半导体激光器多路光纤位移传感器中光强对测量精度的影响

利用半导体激光器线性调频外差干涉原理及分频复用技术构成的新型光纤位移传感器，可同时进行多点位移测量。测量范围为±１ｍｍ，精度为±０．１５μｍ（３σ）。研究了光强因素对其测量精度的影响。     

基于数字位移传感器的位移测量系统

数字位移传感器位移测量系统中的数字位移传感器具有高精度、高分辨率和稳定性好的特点,并且系统中SPP转RS232接口电路,解决上位机与位置反馈环节之间的传输距离短的问题。云台的一米红外太阳望远镜终端为了得到清晰的太阳光谱,将采用该位移测量系统。介绍系统的结构和位移传感器工作原理,阐述了数据采集部分SPP转RS232接口电路的硬件设计和系统的软件设计,并且进行位移测量实验。实验结果表明,该位移测量结果达到了红外太阳望远镜主镜调焦的精度和实时性要求,系统将于2009年年底投入试用。     

基于DSP的集成光栅细分数显装置的研制

设计了一种新的硬件系统,采用光栅位移传感器结合DSP器件实现了位移测量的数字化;传感器输出信号先采用电阻链分相细分,然后通过TMS320LF2407A内部脉冲编码电路（QEP）完成辨向和二次细分,达到了高精度位移测量的目的．测试实验证明该方法集成度高,实时性好,测量精度高．     

一种小型化纳米级单光栅位移测量系统的研制

随着纳米技术的广泛应用以及人们对纳米位移测量认识的不断深化,光栅位移测量技术正在受到广泛的关注。在研究反射式光栅位移测量原理的基础上,设计并实现了一种小型化纳米级单光栅位移测量系统,对系统总体设计、光路布局以及软件算法进行了阐述,最后,利用电容位移传感器ASP-10-ILA等辅助仪器进行了对比实验。实验结果表明:在两路信号不完全正交的情况下系统也能实现准确测量,且理论上系统的位移测量分辨率达到1 nm;在电容位移传感器的量程范围内进行小位移对比试验,系统测量均值与参考值最大偏差118 nm,且与拟合直线偏差均小于100 nm;当光栅发生10 mm以上的较大位移时,测量结果与均值的偏差均小于5 ppm。     

一种测量液压阻尼器轴向位移的方法

为提高飞行测试安全,满足测试需要,设计了基于激光鼠标传感器的非接触式位移测量系统。给出了测量系统的硬件和软件总体设计,系统以ADNS-9800激光鼠标传感器为核心,对阻尼器的轴向位移进行实时测量;以8051核微处理器STC15W1K16S为控制核心,实现测量数据的传输和激光鼠标传感器的上电复位控制。实验证明,该系统的测量误差在0.2%以内,能够满足飞行测试的要求。     

光纤光栅位移传感器的开发及应用

针对全光纤结构健康监测系统中对位移监测的需求,设计了一种基于等强度悬臂梁结构的光纤光栅(FBG)位移传感器,它具有结构简单、测量精度高、温度自补偿等优点。通过对传感器进行标定试验,结果显示其线性相关系数可以达到0.999以上,传感器的测量精度为0.326%FS。该传感器在桥梁支座监测中的成功应用表明其可靠性高、对结构自身影响小,可直接测量支座位移,适合于长期工程结构监测。     

基于传感器的精密光学位移测量预测研究

考虑到当前的精密光学位移测量预测因其动态预测能力较差,导致位移测量预测结果误差较大的问题,设计基于传感器的精密光学位移测量预测方法。选择合适的传感器,设定测距获取光学测量原始数据。对采集到的数据进行整理与分析,获取待测目标位移特征参数。使用支持向量机理论结合位移特征参数,构建位移测量预测模型。计算预测模型损失函数,控制预测误差。通过数据采集传感器获取振动系统的位移,将其作为实验对比过程中的对照位移值。经实验结果证实,采用本方法的位移精度高达52%,而位移耗时高达3%,在不同的测距与振幅条件下,此方法的预测误差小于当前方法预测误差,且预测结果与实测结果较为一致。     

基于反射式塑料光纤传感器的微位移测量技术研究

近年来,高精度的位移测量精度要求越来越高,为响应这一需求,本文依据待测位移量可由反射光强变化得出的原理设计了一种基于塑料光纤的位移传感器.本文所涉及的光纤位移传感器以静态拉伸式杨氏模量测量实验中钢丝长度的微小变化为待测量进行设计.在整个传感器系统制作完成后,结果显示,在0~3mm的位移范围内,测量输出与实际位移成线性关系且线性度为0.6%,在较大位移区间内实现了具有良好线性度的测量,同时,根据实验结果测得灵敏度为2.13mV/μm,保证了测量的精准度.这种设计方法的使用扩大了塑料光纤的应用领域,同时,优化了传感器的精准度和线性化精度等性能指标.     

利用弯曲光纤探头检测液体浓度

介绍了一种利用弯曲光纤探头作为传感器件来测量液体浓度的系统，并使用单片机进行控制和数据处理，实现了系统的智能化。其结果表明，对于小区域的浓度测量，具有速度快、实时性强等优点，实时性强等优点，测量精度可达到２．５％，非线性误差小于０．２％。     

基于单片机的电容式位移测量系统研制

本文介绍了基于单片机的电容式位移测量系统的基本原理,设计了电容式位移传感器的调理电路和AD采样及串口通信电路,采用LABVIEW设计了与＂信号与测试技术＂课程配套的实验操作界面,对所设计测量电路和传感器自带电路的测量数据进行了分析比较。实验结果表明,该测量系统具有精度高、操作简单和测量过程透明等优点,完全符合课程实验教学的实际需求。     

宽量程反射式光纤位移传感器的研究

分析了反射式光纤位移传感器的输出特性,设计了一种新的宽量程反射式光纤位移传感器。以传感器的输出及其相对应的实际位移训练神经网络,建立基于神经网络的传感器逆模型,将其用于传感器输出信号的处理,扩大了测量范围和提高了测量精度。     

激光干涉仪在位移传感器自动检定中的应用

介绍了以双纵模热稳频He -Ne激光干涉仪、微机、被检传感器及数据采集A/D卡、微机接口数据采集卡、机械及电动机构、步进电机驱动卡及相应软件等组成的 ,对差动式位移传感器进行在线自动检定的系统原理。通过实验及现场实际应用均表明 :该检定系统具有测量范围大、检测精度高、测量速度快、自动化程度高等特点 ,有良好的实用性及经济性     

High resolution refractive index sensing with cladded multimode tapered optical fibre

A new fibre-optic refractive index sensor is presented. It is based on the radiation losses introduced by the sample medium in a cladded multimode tapered fibre. A simple light transmission measurement setup is used to test some samples. It is demonstrated that the sensor is suitable for measuring RI in the range 1.36 to 1.46, as well as RI changes below 10/sup -4/.     

电涡流传感器热稳定性标定技术

介绍电涡流传感器位移测量原理,分析温度变化时传感器线圈和探头热胀冷缩在测量位移过程中造成的温度漂移现象.针对传感器的温漂,研制出具有温度补偿功能的电涡流传感器热稳定性标定装置,对传感器输出电压进行温度补偿,减小温度变化对传感器输出电压的影响.同时介绍利用该装置进行温度标定的实现方法,并进行实验验证,实现固定位移条件下环境温度变化时对电涡流传感器输出电压的标定,与无温度补偿时输出电压对比,电压变化量减小了近50%.     

基于磁敏角度技术的拉线式位移传感器的设计与应用

介绍MLX90316的结构和特性,设计以LPC2136为CPU,MLX90316为位置反馈的拉线式位移传感器,给出了基于MLX90316的位移检测策略,并详细分析了接口电路原理图和编程原理。该传感器具备一路RS485通信链路和一路基于PWM可调电流输出。试验证明,该传感器克服传统拉线式位移传感器的易磨损、分辨力差、阻值偏低、高频特性差等缺点,提高了测量精度。     

A novel wide measuring range FBG displacement sensor with variable measurement precision based on helical bevel gear

The goal of Optoelectronics Letters is to rapidly report original,new and important results in the fields of photonics and optoelec-tronics in English,to advance the international academic exchanges.Optoelectronics Letters pays a particularly attention to the cross topics between photonics and electronics.The scope of Optoelectronics Letters is as follows:Novel OEdevices and applications;New materials and functional components;Nano-structures and OE integration;Nano-quantum optoelectronics;     

激光三角位移计接收光功率与被测表面倾斜的关系及倾斜角测量

以激光在粗糙物体表面的散射理论为基础．详细讨论了被测表面倾斜与激光三角位移计接收光功率的关系，在此基础上提出了在测位移的同时测量该倾斜角的方法．给出了计算机模拟及实测的结果。     

The design of miniaturised displacement transducers for deep hole diameter measurement

The paper presents a new approach to the design of a miniaturised displacement transducer for deep hole measurement. By exploiting the induced eddy current effects detected by chip coils, the sensor generates a frequency output signal. The sensor chip coil can be manufactured by the similar processes to those used for manufacturing a printed circuit board (PCB) which allows them to be miniaturised. The paper elaborates on the construction and mechanism by which the displacement is directly transferred to a frequency output. It also reports on the transducer, which uses two contact probes for transmitting the displacement to a non-contact sensing element. Experimental results demonstrate the stability, linearity, measurement range and accuracy of the sensor system.     

An Electromechanical Film Sensor Based Wireless Ballistocardiographic Chair: Implementation and Performance

New sensor technologies open possibilities for measuring traditional biosignals in new innovative ways. This, together with the development of signal processing systems and their increasing computing power, can sometimes give new life to old measurement techniques. Ballistocardiogram (BCG) is one such technique, originally promising but later replaced by the now very popular electrocardiogram. It’s usability was previously limited by the large size of the devices required to record it, and the complex nature of the recorded signal, which gave little information in visual inspection. In this paper, we present how a lightweight and flexible electromechanical film (EMFi) sensor can be used to record BCG. A ballistocardiographic chair, designed to look like a normal office chair, was built and fitted with two sensitive EMFi sensors. Two different measurement setups to record the signal from the EMFi sensors were developed. The first, so-called wired setup, uses a commercial bio-amplifier, and a special pre-amplifier to interface to it. The latter, so-called wireless setup, uses our own hardware to transmit the recorded digitized signals wirelessly to a nearby PC. Both of these systems are presented and their performance evaluated. Also, the suitability, limitations and advantages of the EMFi sensor over existing sensors and methods are discussed. The validity of the EMFi sensor and amplifier output is tested using a mechanical vibrator. Lastly, a summary of signal analysis methods developed for our system is given. The developed systems have be used for medical BCG measurements, and the recordings indicate that the both the systems are functional and capture useful BCG signal components.