共查询到20条相似文献,搜索用时 218 毫秒
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本文综述分子探针在光纤化学传感器探头上的固定方法,按照其结合方式分为物理方法和化学方法,并分别综述了它们各自的特点及实际应用、引用文献25篇。 相似文献
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为克服常用声发射传感器必须和被测物体接触,工作频带较窄且带内幅频特性波动较大和易肥电磁干扰的不足,提出采用光纤干涉仪原理研制声发射传感器,介绍了光纤声发射传感器的原理,系统组成。其频率范围为100kHz-1.4MHz,振幅分辨率为0.18nm。 相似文献
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提出并实现了一种表面粗糙D形光纤探针结构的消逝场传感器,通过自主搭建简易的光纤侧面抛磨装置,得到表面粗糙的D型光纤,将其一端镀上银膜作为反射镜面,得到D型光纤探针。对D型光纤探针进行传输损耗的折射率传感特性检测,发现当被测溶液折射率变化时,会因消逝场与被测溶液之间作用的不同而引起能量吸收的不同,进而使接收到的光功率发生显著的变化。实验测得传感器折射率灵敏度为64.93 dB/RIU,线性相关系数高达99.53%,检测精度可达0.000 06。该传感结构在医疗检测、生物化学和环境监测等领域都有着广泛的应用。 相似文献
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振幅调制型光纤传感器采用光桥式补偿结构后,有效地减小因环境因素变化而导至的误差,该技术应用于光弹效应光纤压力传感器及激光雷达储油罐液位测量中,取得明显的效果。 相似文献
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多极探针型电容式水分传感器 总被引:4,自引:0,他引:4
叙述了一种新型的高灵敏度的多极探外型电容式水分传感器.该传感器还带一个用于温度补偿的温度传感器.并详细介绍了该传感器实现粉粒状物料水分检测的电路原理. 相似文献
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A light guiding flexible fused silica (FFS) capillary has been used in designing evanescent wave (EW) absorption based chemical sensors. The FFS capillary is similar to a conventional silica optical fiber in that it can guide light in the wavelength region from UV to near infrared, but different from a conventional optical fiber in that it is a tubular waveguide. The inner surface of the FFS capillary is fused silica, which was coated with a reagent doped polymer in order to design an optical fiber chemical sensor. The FFS capillary has a cladding layer plus a protection polymer coating on its outside surface. The cladding layer ensured the capability of the FFS capillary for guiding light. The protection coating increases the FFS capillary's mechanical strength and makes it robust in practical applications. This makes the FFS capillary very useful in designing an EW based optical chemical sensor of a long path length. Techniques for activating the inner surface of an FFS capillary, coating the inner surface of the capillary with a polymer, connecting the coated capillary to a light source and a photodetector, and delivering a sample through the capillary have been developed in this work. Three optical sensors for sensing Cu(II), toluene in water samples and ammonia in a gas sample have been fabricated and tested. Preliminary test results obtained in this work illustrate the feasibility of fabricating highly sensitive EW absorption based chemical sensors with the light guiding FFS capillary. 相似文献
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本文提出了一种新型的光纤电流互感器结构,从理论和实验结果上证明了该互感器能有效地抑制了温度等环境变化所产生的干扰。与晶体构建的光纤电流互感器相比,这种电流互感器动态范围大、灵敏度高、插入损耗小、信噪比高。 相似文献
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新型光纤电流传感器在煤矿中的应用研究 总被引:1,自引:0,他引:1
针对煤矿井下大电流检测存在的问题,对一种新型光纤电流传感器进行了设计与研究,采用具有物理补偿的传感头解决相位差问题,采用双光路补偿信号处理系统并建立温度补偿方程解决温度对电流的影响。通过搭建实验电路证明该电流传感器可以满足煤矿井中电流检测的大量程、高精度、实行性和稳定性的要求。 相似文献
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The paper proposes an approach where structural systems can be developed according to the mathematical theory of fractals. Architecture can take advantage of the complexity sciences, by the use of present day computer technology, where algorithms of mathematical and geometric functions can produce new motifs of design. In order to demonstrate this, examples of the use of the elliptic and hyperbolic paraboloid, and the design of a tree on the surface of an elliptic paraboloid, are given. Further, the way to compose relevant algorithms is described. 相似文献