共查询到20条相似文献,搜索用时 687 毫秒
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构建了一种以光纤和光纤束作为系统信号传输通道的光纤倏逝波生物传感器系统,根据光纤探针的倏逝波理论和模式匹配理论对光纤探针进行了设计与制作,然后应用直接结合分析的方法对该传感器系统的探测性能进行了实验检测.实验针对光纤探针置于空气中和蒸馏水中两种情况进行,同时将系统检测到的信号通过数据采集卡采集到计算机中,并进行相关检测分析.对光纤探针置于空气中和蒸馏水中两种情况,系统分别获得了16.7和20.5的探测信噪比.实验结果表明,该相关检测方法能很好的区分系统的噪声信号和所探测的荧光信号,整个系统具有良好的可行性. 相似文献
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为了探讨叶端定时光纤传感器的设计方法和设计依据,在实验测量的基础上建立了一个在高斯光束几何反射模型下的一维数值计算方法,可以在计算机上对叶端定时光纤传感器的特性进行计算分析,为叶端定时光纤传感器的优化设计提供了一个必要工具.对62.5/125多模光纤构成的19芯和37芯叶端定时光纤传感器的计算分析结果表明,传感器端面处的反射光斑半径在300 μm附近时有最佳的信噪比和接收光强波形;由发射光纤直接出射光束的19芯或37芯叶端定时传感器在与叶端的间距为1~3 mm范围内有较好性能;若用LD作为光源,37芯叶端定时传感器可以更好地的减少激光散斑的影响. 相似文献
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针对传统土压力传感器长期稳定性差、抗电磁干扰能力不强以及组网难度大等问题,根据传感器与土介质的匹配原则,设计了一种焊接结构双膜片光纤Bragg光栅(FBG)温度自补偿土压力传感器,可实现温度和土压力2个参量的同时测量.传感器主要由2个膜片与基体组成,膜片与光栅固定柱一次成型,便于加工封装.对传感器灵敏度系数进行了计算分析.根据分析结果,加工封装传感器并对其进行了压力校准及温度自补偿性能实验.实验结果表明:传感器的输出波长分别与温度和压力呈线性关系,压力灵敏度系数为528.1 pm/MPa,输出分辨率为0.19%,线性相关度99.988%;在5~45℃内温度灵敏度系数为31.9 pm/℃,线性相关度99.998%,传感器在5~45℃范围内具有良好的温度自补偿能力,其性能参数符合工程应用要求. 相似文献
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Yusuke Arai Michiko NishiyamaKazuhiro Watanabe 《Sensors and actuators. A, Physical》2011,172(2):359-364
Hetero-core fiber optic sensors can transmit sensing and communication signals on a single fiber optic transmission line and have numerous advantages for environmental information monitoring such as home security. Moreover, these sensors are cost effective due to their temperature independence and light-intensity-based measurements. We have previously developed a hetero-core fiber optic binary sensor that can be connected in series to detect the number of doors and windows that are opened or closed. In this paper, we propose an improved method for using hetero-core fiber optic binary sensors that are connected in series, which are referred to as binary switches. A unique pulse loss change enables the states of the connected switches to be identified. As a result, the total optical loss in the transmission line is reduced. Therefore, the number of binary switches connected in series can be increased on a single transmission line. The unique pulse loss peaks can be controlled by the action of a flat spring and by adjusting the position of the flat spring inside the binary switch module. Typical pulse peaks of each binary switch are from 0.13 to 0.75 dB in the positive direction and from −0.47 to −0.03 dB in the negative direction, while the typical insertion loss is from 2.23 to 2.61 dB, depending on the position of the hetero-core segment within the binary switch module. The connection of two binary switches in series is successfully demonstrated for monitoring the optical loss change on a single transmission line. The results of the present study show that the number of binary switches connected in series can be increased significantly on a single transmission line. 相似文献
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S.S. PatilAuthor Vitae A.D. ShaligramAuthor Vitae 《Sensors and actuators. A, Physical》2011,172(2):428-433
Fiber optic displacement sensors (FODS) are studied and analyzed by using different configurations (Atsushi and Kohichi, 1996; Faria, 1998; Buchade and Shaligram, 2006) [1], [2] and [6]. Mathematical models developed for these configurations use analytical methods and techniques. It is observed that these models are useful for a specific geometrical arrangement of fibers and reflector and are not useful for any variation in configuration. Hence it is necessary to develop a mathematical model which is independent of configuration of the fiber optic sensors. This paper discusses development of such generalized model which is useful for studying and analyzing any configuration and scenario of fiber optic sensor. The model is expected to be useful in analyzing manufacturing tolerances as well as effects of the geometrical parameters on performance of the sensor. 相似文献
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介绍了光纤传感器在飞行器结构上的应用,包括表面贴装与内埋光纤损伤探测系统,内埋的监测复合材料内部声波辐射的光纤应变传感器及测量复合材料的内应变张量的应变计,并介绍了光纤神经网络的初步研究。 相似文献
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基于光谱检测的光纤温度传感器 总被引:1,自引:0,他引:1
一种应用波长原理的光纤测温新技术 ,这种波长技术是基于某些半导体 (如GaAs)的光学吸收限产生的频移 ,半导体小棱镜粘在远离光纤测头的一端 ,并用一个快速扫描分光计来检测靠近探头处宽带光源的吸收频移 ,这种分光计由衍射光栅和阵列式硅光电探测器组成。系统的测温范围在 2 0℃至 175℃ 相似文献
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介绍了光纤电压、电流传感器在煤矿中的应用,在工频电压4~6kV和工频电流100~1000A条件下验证了该光纤电参数传感器电压误差小于1%、电流误差小于3%。指出了提高电流检测精度是提高光功率、降低前放噪声及有效收集磁场的有力措施 相似文献