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光纤传感技术已广泛应用于航空航天、石油化工、电子电力、土木工程、生物医药等领域,其技术形式主要体现为分立式和分布式.分立式光纤传感技术利用光纤敏感器件作为传感器来感知被测参量的变化,光纤作为光信号的传输通道连接光纤传感器及后端的解调装置;分布式光纤传感系统基于光纤瑞利散射、拉曼散射或布里渊散射等光学效应,利用光纤本身作为传感器,可对沿途的光信号进行大范围、长距离传感.本文介绍了分立式与分布式光纤传感中主要关键技术的研究进展,并对未来的研究和发展方向进行了探讨. 相似文献
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J. M. Lopez-Higuera 《Fiber and Integrated Optics》2004,23(2):207-229
The recent research and development results of the Photonic Engineering Group in the photonic sensing field are reported. This article includes a sample of contributions in several of the ongoing R&D lines: fiber sensing using Bragg grating technology; gas sensing, high temperature monitoring; optoelectronic instrumentation for laser welding monitoring; fiber active devices; and, finally, on sensing technology using plastic optical fiber. 相似文献
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J. M. LOPEZ-HIGUERA 《Fiber and Integrated Optics》2013,32(2-3):207-229
The recent research and development results of the Photonic Engineering Group in the photonic sensing field are reported. This article includes a sample of contributions in several of the ongoing R&D lines: fiber sensing using Bragg grating technology; gas sensing, high temperature monitoring; optoelectronic instrumentation for laser welding monitoring; fiber active devices; and, finally, on sensing technology using plastic optical fiber. 相似文献
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Michail Bourmpos Apostolos Argyris Dimitris Syvridis 《Fiber and Integrated Optics》2014,33(3):205-223
AbstractA continuously growing number of municipalities has optical fiber networks supporting communications at their disposal. These fiber installations can also be utilized to convey low data optical signals from a large number of deployed sensing elements, usually positioned in critical infrastructure locations, providing a variety of useful information. Such information can be used in the context of a “smart city” to provide citizens with higher-level services or even to proactively ensure public security and safety. This work demonstrates a fiber sensing network based on low-cost fiber Bragg grating sensors that are able to appropriately oversee diverse monitoring parameters. 相似文献
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非均匀光纤光栅响应特性的研究 总被引:12,自引:3,他引:9
光纤栅在未来光纤通信与光纤传感系统中将关键性作用。本文进行了不同线型光栅迹与喃啾 等波导结构参数下的非均匀光纤光栅响应特性的数值计算,并通过对光栅响应不对称性的研究讨论,提出了光栅响应对称性的两个一般条件。 相似文献
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Fiber optic sensing technology is used extensively in several engineering fields, including smart structures, health and usage monitoring, non-destructive testing, minimum invasive sensing, safety monitoring, and other advanced measurement fields. A general optical fiber consists of a core, cladding, and coating layers. Many sensing principles require that the cladding or coating layer should be removed or modified. In addition, since different sensing systems are needed for different types of optical fibers, it is very important to find and sort out the suitable cladding or coating removal method for a particular fiber. This study focuses on finding the cladding and coating stripping methods for four recent specialty optical fibers, namely: hard polymer-clad fiber, graded-index plastic optical fiber, copper/carbon-coated optical fiber, and aluminum-coated optical fiber. Several methods, including novel laser stripping and conventional chemical and mechanical stripping, were tried to determine the most suitable and efficient technique. Microscopic investigation of the fiber surfaces was used to visually evaluate the mechanical reliability. Optical time domain reflectometric signals of the successful removal cases were investigated to further examine the optical reliability. Based on our results, we describe and summarize the successful and unsuccessful methods. 相似文献
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甲烷是瓦斯的主要成分,是易燃易爆的气体。介绍了瓦斯的光谱特性以及光谱吸收法测量甲烷气体浓度的原理,给出了光谱吸收型光纤瓦斯气体传感器的主要进展和技术路径,包括差分吸收测量法和谐波吸收测量法。通过分析可看出,光谱吸收型光纤瓦斯传感器以其优良的特性得到了广泛关注,其中差分吸收法的抗干扰能力强,系统可靠性高,具有较强的工程应用价值。 相似文献
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提出了一种基于平面Y分支波导与法拉第旋镜的高灵敏度光纤电流传感器结构方案。利用两个法拉第旋镜与平面Y分支波导构成一个光纤反射腔,通过光在腔中的多次反射来增加待测电流导致的传感光纤中的法拉第相移,从而实现对微弱电流的测量。该结构方案中首次采用了平面Y分支光波导,从而可降低光路系统损耗,增加灵敏度,为微弱电流测量的工程化提供了一种可行的方法。 相似文献
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基于表面等离子体共振原理的空芯光纤传感器 总被引:2,自引:0,他引:2
设计了一种基于表面等离子体共振原理,使用空芯光纤作为光波导、外表面镀金属膜的光学材料圆柱体作为探头的新型折射率传感器。通过建立光学模型进行分析,在理论上推导出了这种传感器的传输光谱损耗公式,并针对该传感器在不同的光纤长度、探头材料、检测物质折射率等参数设置下的检测性能进行了分析,获得了各种参数对其性能的影响。由于该传感器可针对不同折射率的检测物质灵活地更换合适探头材料,相对于传统的表面等离子体共振光纤传感器,在易用性和性价比等方面具有更好的应用价值。 相似文献
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针对溶解氧浓度微量探测的现实需求,提出了一种基于荧光猝灭原理、利用多孔光纤实现的溶解氧浓度测定新方法。该方法将钌联吡啶[Ru(dpp)3]Cl2掺杂的凝胶薄膜修饰在多孔光纤的内壁上,制备了一种溶解氧测定探头并对其测试性能进行表征。光纤贯穿整个长度的孔洞结构既可以作为敏感膜的载体,也可以作为待测物流过的通道和反应场所。与传统测试方法相比,该测试探头的多孔道结构显著提高了比表面积,指示剂可以与溶解氧直接反应,提高了探头的敏感性并且具有微量探测的潜力。实验结果表明,在0~20 mg/L的浓度范围内,Stern-Volmer曲线近似线性,响应敏感度I0/I为3.6,响应时间为200 ms。该测试方法在溶解氧微量探测领域具有重要用途。 相似文献
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光纤振动传感器探头的设计 总被引:2,自引:0,他引:2
提出和论述了一种光纤振动传感器的原理和探头设计方法。使用悬臂梁来遮挡反射回光纤的光 ,用光强度调制来实现振动信号的测量。这种传感探头只需一根光纤引出 ,紧凑小巧 ,易于安装调试。结果表明 ,这种光纤振动传感器传感头是可靠而耐用的 ,长时间工作稳定 ,抗外界干扰强 ,易制作 ,易安装。 相似文献
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A. B. Lobo Ribeiro J. L. Santos J. M. Baptista L. A. Ferreira F. M. Araú jo A. P. Leite 《Fiber and Integrated Optics》2005,24(3):171-199
A general overview of the R&D activity in fiber optic sensing developed over the last fifteen years in Portugal is given. Different topics are addressed, including interferometric, intensity and Bragg grating based fiber optic sensors, signal processing and multiplexing techniques, optical current sensors, together with some references to field trials and applications. Possible guidelines for present and future national R&D activity on this subject are outlined. 相似文献
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在基于掺铒光纤-拉曼混合放大的可调光纤环形激光器的光纤布拉格光栅(FBG)传感系统结构基础上,提出了延长传感距离的新方法。该方法以环形掺铒光纤激光器作为光源,采用双波长拉曼放大的方法对信号进行低噪声的双向放大,系统中间的两段掺铒光纤再利用剩余的抽运功率产生自发辐射光和放大传感信号,使得整个系统能够在超长的传感距离上获得很高的信噪比。实验表明使用一只40 mW的掺铒光纤放大(EDFA)抽运源、一只170 mW的拉曼抽运源和一只2 W的拉曼抽运源,可以使整个系统的传感距离达到100km,并且传感系统的光纤布拉格光栅反射信号均能获得超过57 dB的优良信噪比,从而实现在超长距离上的光纤布拉格光栅传感。 相似文献
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A. B. LOBO RIBEIRO J. L. SANTOS J. M. BAPTISTA L. A. FERREIRA F. M. ARAÚJO A. P. LEITE 《Fiber and Integrated Optics》2013,32(3-4):171-199
Abstract A general overview of the R&D activity in fiber optic sensing developed over the last fifteen years in Portugal is given. Different topics are addressed, including interferometric, intensity and Bragg grating based fiber optic sensors, signal processing and multiplexing techniques, optical current sensors, together with some references to field trials and applications. Possible guidelines for present and future national R&D activity on this subject are outlined. 相似文献