共查询到20条相似文献,搜索用时 62 毫秒
1.
SMS传感器结构简单、成本低廉、易于铺设,被广泛的应用于弯曲、位移、温度、应变、折射率等参量的测量,近年来成为研究的热点.本论文利用大芯径多模光纤制作SMS结构以实现高灵敏度的光纤传感结构.首先,将纤芯/包层直径为105/125微米的多模光纤通过单模光纤接入光纤系统,实现SMS光纤结构,通过对多模光纤进行偏轴熔接的手段制作SMS器件结构;然后对单模-多模-单模光纤结构的模式干涉效应和光谱响应特性进行理论分析;最后,借助宽谱光源和光谱分析仪测试了单模-多模-单模光纤结构随应力变化的透射光谱特性,通过对波峰随着应力改变而发生变化的曲线的观察,计算出其灵敏度,发现实验值与理论值基本吻合. 相似文献
2.
3.
建立了捷联惯导系统的有限元模型,提出用单自由度弹簧振子模型估计减振器的刚度和阻尼系数的方法,并得到实验的验证。提出用一维系统低频逼近多自由度解耦系统的近似分析方法。解释了陀螺随机振动响应曲线高频波动的原因。分析了光纤环的材料刚度和几何参数对其内应力的影响规律。 相似文献
4.
从应变片、应变仪、记录仪和数据处理系统 4个环节分析了机械应力实测过程中所产生的误差及产生误差的原因。针对各种误差 ,结合实际情况 ,得出了使误差降到最小程度的具体措施 ,阐明了保证测试数据准确性的实际意义。 相似文献
5.
6.
在概述双包层光纤结构和包层泵浦激光器的结构原理、种类的基础上,综述了近年来高功率包层泵浦光纤激光器在连续和调Q方面以及在拉曼光纤激光器方面的最新进展,并展望了包层泵浦光纤激光器的应用前景。 相似文献
7.
本文用切环法对液压缸的应力分布进行了计算,并用电测法对液压缸模型的应力分布进行了测试。结果表明,切环法计算缸的应力分布较为准确。液压缸法兰与支承梁之间的摩擦对法兰处的应力有效大影响。 相似文献
8.
本文分析了具有固定周边受同心环载荷环板的应力,从而导出径向应力、切向应力及挠度的计算公式,最后给出了一般应力曲线及最大应力的确定方法。 相似文献
9.
从应变片,应变仪,记录仪和数据处理系统4个环节分析了机械应力实测过程中产生的误差及产生误差的原因。针对各种误差,结合实际情况,得出了使误差降到最小程度的具体措施,阐明了保证测试数据准确性的实际意义。 相似文献
10.
11.
高分辨率麦克尔逊光纤应变传感器 总被引:3,自引:1,他引:2
运用麦克尔逊干涉结构,采用氦氖激光、单模光纤、光纤耦合器等器件构成光纤应变传感器,利用除法器消除光源幅度干扰,提高系统的分辨率.本文采用在光纤端面镀反射膜的方法提高抗干扰能力;输入、输出在同一侧便于使用;实验结果表明所设计的传感器是正确和可行的. 相似文献
12.
An optical fiber refractive index sensor based on fiber loop ring-down spectroscopy and a tapered fiber was fabricated using an ordinary single mode fiber with an arc fusion splicer. The performance of the sensor was controlled by the parameters of the tapered fiber. A fiber loop ring-down spectroscopy system was employed to enhance the sensitivity and demodulate the transmission spectrum. The results showed that a sensor with a waist diameter of 14 m and a length of 1.2 mm had good optical performance. By monitoring the ring-down time of the system, relatively high sensitivity of 411.576 s/ RIU was achieved with refractive index values from 1.333 to 1.412. This sensor offers few interferences, high sensitivity, easy fabrication, and low cost. 相似文献
13.
14.
15.
《Measurement》2014
Structure multi-parameters measurement, such as strain, displacement, corrosion and temperature, is of the utmost importance for structural health monitoring. Meanwhile uncoupling method of temperature and strain has still a technical problem in structure sensing measurement. In this paper, we proposed a method for simultaneous measurement of strain and temperature using a hybrid local and distributed optical fiber sensing system. The principle of the method is investigated and then validated by the theoretical simulation experiments and tensile tests in laboratory. Furthermore, one experiment for internal force measurement of a smart stranded wire, under the interaction of temperature and strain, is also conducted in lab. The experimental results show that the strain and temperature can be well measured simultaneously by using one multi-signal optical fiber sensor. 相似文献
16.
Zhang Deng-wei Shu Xiao-wu Mu Xu-dong Liu Cheng 《Frontiers of Mechanical Engineering in China》2006,1(4):434-438
In order to receive and process the open loop signal from fiber optic gyroscopes speedily, stably and expediently, and to
realize the amity interface between human and machine, a digital system that can convert GPIB (general purpose interface bus)
parallel bus into Universal Serial Bus is developed. All the interface functions of GPIB and the hardware system are realized
through FPGA. With a digital sampling and processing system designed with VC++ in Windows platform, the real-time controlling
procedure, high-speed receiving and sending data can be carried out, and the results can be displayed too. So the design of
the system is flexible, the reliability and the stability are improved, error rate is no more than 10−11, the highest bit rate is 8 MB/s and the open loop detection system for optic fiber gyros achieves standardization and complete
digitalization simultaneously.
__________
Translated from Chinese Journal of Scientific Instrument, 2005, 26(10) (in Chinese) 相似文献
17.
18.
Xianghua Li Xiaohui Liu Shenfang Yuan 《Frontiers of Mechanical Engineering in China》2008,3(4):416-420
The experimental characterization of three-dimensional (3-D) braided composites is extremely important for their design and
analysis. Because of their desirable attributes and outstanding performance, optical fiber sensors (OFSs) can be embedded
to monitor mechanical properties of textile composites. This paper discusses two techniques to incorporate different OFSs
into 3-D braided composite preforms. The operating principle of various sensor systems is first conducted. Experiments using
Michelson interferometers, FBG sensors, and micro-bend sensors are performed to verify the concept of the proposed method.
Strain curves of various OFSs tests are finally compared, and they all exhibit good linearity. 相似文献
19.
联系传感器应用的作用机理,根据变形传递方式的不同,对工程中常用的光纤传感器进行了系统的归类分析。基于应变传递理论建立了应变传递系数与测量允许误差的关系,并以此为优化控制方程得到了满足工程测试精度要求的传感器最佳取值,给出了各类传感器具体的优化设计方法及优先设计指标。研究结果表明:基于应变传递理论的优化设计方法较适用于依靠界面剪应力传递变形的光纤传感器,其优先设计指标依次为粘贴(感知)长度、层间粘结强度、保护层弹性模量和半径、粘贴层厚度;端部扩径型传感器的优化设计则因其应变传递系数能较准确和便利地通过标定试验获取而不依赖应变传递理论,且无明显的优先设计指标。本文充分考虑了传感器工程应用的实际状态,以测试准确性为核心,从力学作用机理角度对传感器进行了较全面和系统的分析,其研究结果可以用于指导工程化光纤传感器的应用设计和标定测试。 相似文献
20.
光纤传感器埋入沥青路面基体的应变传递误差 总被引:1,自引:0,他引:1
介绍了光纤传感涉及的应变传递理论,基于该理论建立了基体和感知光纤应变的定量关系,以消除应变传递误差,提高测试精度。针对埋入式光纤传感器用于高黏度的柔性沥青路面基体的最普遍形态,建立了含感知光纤、封装层和基体的典型三层力学模型。采用Goodman假设描述层间剪应力关系,引入傅里叶级数法求解微分方程,建立了基体和感知光纤的平均应变传递关系。通过室内试验论证了推导的应变传递理论公式的有效性,并对影响平均应变传递效率的几何参数和材料参数进行了灵敏度分析。分析结果表明:光纤粘贴长度越长,光纤和封装层的层间黏结越紧密,平均应变传递系数越大,应变传递效果越好。本文的研究可广泛用于埋入式光纤传感器的应变传递误差修正及封装设计。 相似文献