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分布式传感是光纤光栅传感技术得以推广的优点之一,它利用光纤布拉格光栅中心反射波长值的不同来识别网络中各点的变化状况,不仅实现了大范围测量场内分布信息的提取,还解决了目前测量领域的许多难题。简单介绍了布式光纤光栅传感的分类及其解调技术和复用技术,深入研究了分布式光纤光栅传感系统中传感器的布置方式和故障定位方法,并介绍了分布式光纤光栅传感的应用和发展现状。 相似文献
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从光纤光栅温度传感模型出发,分析研究光纤光栅的温度传感特性,比较裸光纤光栅与增敏光纤光栅的温度敏感性,在此基础上提出一种基于滤波法的光纤光栅解调系统,研究表明,此系统具有结构简单,操作方便,灵敏度高的优点。 相似文献
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从光纤光栅温度传感模型出发,分析研究光纤光栅的温度传感特性,比较裸光纤光栅与增敏光纤光栅的温度敏感性,在此基础上提出一种基于滤波法的光纤光栅解调系统,研究表明,此系统具有结构简单,操作方便,灵敏度高的优点。 相似文献
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本文在以基于光纤布拉格光栅(FBG)的传感器的基础上,介绍了啁啾光纤光栅(CBG)的光学特性、基于啁啾光纤光栅的光栅内传感的概念和在此基础上实现传感的途径。 相似文献
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针对传统的强度型光纤位移传感器安装复杂、漂移大等问题,采用光纤光栅新型位移传感器,设计并实现了一种波长编码、自校准和不受光强影响的新型光纤光栅位移传感实验装置。该实验装置简化了传统强度编码光纤传感器的安装过程,具有抗环境振动和温度补偿功能,对快速掌握新型光纤光栅位移传感原理和使用方法,提高光纤传感实用技能具有实际的意义。 相似文献
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相位模板技术与布拉格光纤光栅的写入 总被引:4,自引:0,他引:4
由于相位模板法仅使用一个光学器件 ,因而减少了光纤光栅制造系统的复杂性 ,是光纤布拉格光栅写入法中最有前途、使用最广泛并且具有本征稳定性的一种方法 .本文总结了相位模板技术及各种光纤布拉格光栅的写入 .值得注意的是在相位干涉法中 ,只用一块相位模板 ,就可以调整写入光纤布拉格光栅的波长 .在这些系统中 ,写入光纤光栅的紫外线 ( UV )干涉条纹经由一些光学元件 ,其中 ,相位模板的作用通常是± 1级衍射光的分束器 相似文献
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分析光纤光栅传感机理,阐述可调光纤F-P滤波器的工作机理和特点,并基于单片机AT89C52实现光纤光栅解调系统。 相似文献
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分析光纤光栅传感机理,阐述可调光纤F-P滤波器的工作机理和特点,并基于单片机AT89C52实现光纤光栅解调系统。 相似文献
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电学实验中仪器的选择是一项综合性指标,既要对仪器不造成损害,又要使测量的误差尽可能的小,并不是量程不小于待测量值和实际值不大于额定值即可。怎样选择仪器呢? 一、电表的选择指针式电压表、电流表的“允差”(最大可能误差)为±(量程×等级÷100),例如某一2.5级电压表量程0~3伏,允差ΔU=±3×2.5%=±0.075伏。因此,用同一量程时,电表不同示数的绝对误差相同,但相对误差不同。当上述电压表读数U=2.5伏时,则相对误差仍为ΔU/U=±0.075/2.5=±3%,而当读数U=0.50伏时、相对误差却增大为ΔU/U=±0.075/0.50=±15%。由此可见,选择电表量程时,应使指针的偏 相似文献
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Hai-tao Zhao Quan-bao Wang Ye Qiu Ji-an Chen Yue-ying Wang Zhen-min Fan 《浙江大学学报(A卷英文版)》2012,13(7):538-545
This paper deals with an improved bonding approach of surface-bonded fiber Bragg grating (FBG) sensors for airship envelope structural health monitoring (SHM) under the strain transfer theory. A theoretical formula is derived from the proposed model to predict the strain transfer relationship between the airship envelope and fiber core. Then theoretical predictions are validated by numerical analysis using the finite element method (FEM). Finally, on the basis of the theoretical approach and numerical validation, parameters that influence the strain transfer rate from the airship envelope to fiber core and the ratio of effective sensing length are analyzed, and some meaningful conclusions are provided. 相似文献
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A discrimination measurement method and demodulation technique for fiber Bragg grating (FBG) sensors were presented using digital filtering technique. The system can control a tunable fiber Fabry-Perot filter with sawtooth wave voltage generated by digital clock to interrogate FBG sensors. Using the analogue digital converter (ADC), the reflected FBG signals were sampled with synchronous digital clock. With the aid of digital matched filtering technique, the sampled FBG signals were processed to obtain the maximum signal-to-noise ratio (SNR) and the Bragg wavelength shift from the FBG signals was recovered. The results demonstrate that this system has a scanning range of 1 520 nm-1 575 nm,and the wavelength detection accuracy is less than 2 pm with 1.5 Hz scanning frequency. 相似文献
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In this paper, we present a simple and fast spectra inversion method to reconstruct the temperature distribution along single
fiber Bragg grating (FBG) temperature sensor. This is a fully distributed sensing method based on the simulated annealing
evolutionary (SAE) algorithm. Several modifications are made to improve the algorithm efficiency, including choosing the most
superior chromosome, setting up the boundary of every gene according to the density of resonance peaks of the reflection spectrum,
and dynamically modifying the boundary with the algorithm running. Numerical simulation results show that both the convergence
rate and the fluctuation are significantly improved. A high spatial temperature resolution of 0.25 mm has been achieved at
the time cost of 86 s. 相似文献
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张伦伟 《上海大学学报(英文版)》2006,10(2):154-155
Thisdissertationaimsatprovidingsteadysensingfor theshapedetectionofcolonoscopes.Theresearch especiallydealswiththekeytechniquesoffiberbragg grating(FBG)largecurvaturesensorandsensornet,integratesthetechniquesofmechatronicsandcomput ergraphics,anddevelopsrealtimeFBGshapesensing systemandincrementalshapesensingsystemfor colonoscopies.Aftertheanalysisofstate of the artforthedevelop mentoftheendoscopeandthedifficultiesofcolonos copy,theactualitiesofbothendoscopicshapesensing systemsandofFBGstru… 相似文献
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对布拉格光纤光栅(FBG)和基于光散射的分布式光纤测温技术原理进行阐述。经比较,基于拉曼散射的分布式测温系统性能良好,更易实现。同时探讨了光纤传感与计算机技术融合的智能光纤监测系统在大坝水利安全监测中的应用。 相似文献