Fiber optic distributed sensing techniques with high spatial resolution and high performance for smart materials, structures and communication networks.

具有高空间分辨率和高性能的光纤分布式传感技术，适用于智能材料、结构和通信网络。

• 批准号: 13002003
• 负责人: HOTATE Kazuo
• 金额: $ 122.3万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Specially Promoted Research
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13002003/
• 关键词: SMART MATERIALS and STRUCTURES; OPTICAL COMMUNICATION NETWORKS; DISTRIBUTED OPTICAL FIBER SENSORS; OPTICAL FIBER SENSORS; OPTICAL COHERENCE CONTROL; DISASTER PREVENSION TECHNOLOGIES

Research subjects originally scheduled in this project have enough been done, and some new subjects have also been added and performed. As for the first subject "Fiber optic distributed strain sensing technique by use of stimulated Brillouin scattering generated locally along the fiber," dynamic strain sensing function has been introduced. The sampling rate obtained is 57Hz, which is 10,000 time faster than conventional time domain technologies. In vibration measurement using a building model, multiple points, simultaneous and dynamic strain sensing has been done for the first time. Clack in concrete with sub-mm width has also been measured for the first time, utilizing cm-order spatial resolution of this technique. This technique is only one that can measure distributed strain along a fiber with cm-order spatial resolution and several tens of Hz sampling-rate. These functions are creating new diagnostic algorithm for materials and structures. A way for simplifying the system, a scheme … More for elongating the measurement range, a way for measuring simultaneously strain and temperature, and a scheme for realizing quite a high spatial resolution have also been proposed and experimented. As for the second subject "Fiber optic distributed lateral stress measurement by synthesis of optical coherence function," the spatial resolution has been improved as about 40 times to be 20cm. A simplified system has also been realized. As for the third subject "Diagnostic system for fiber to the home networks," measurement range has been improved. At the end of 5km length fiber, reflectivity distribution has been measured with about 10cm spatial resolution and 1km measurement range. As for the forth subject "Related sensing technologies," a system for multiplexing FBG's with the same Bragg wavelength has newly been developed by the use of synthesis of optical coherence function technique (SOCF). Sampling rate of 100Hz and random access capability has been realized. A FBG multiplexing system using a fiber laser with multiple lasing wavelengths, scheme for controlling characteristics of EDF dynamic grating by SOCF, a system for measuring vibration distribution along a fiber, and so on, have also been proposed and developed. Through this research project, novel techniques of fiber optic nerve systems for smart materials, structures and communication networks have been successfully developed. Less

该项目原定的研究课题已经完成，并且还增加和开展了一些新课题，第一个课题“利用沿光纤局部产生的受激布里渊散射的光纤分布式应变传感技术”，动态应变。引入了传感功能，获得的采样率为 57Hz，比传统时域技术快 10,000 倍，在使用建筑模型进行振动测量时，首次实现了多点、同步和动态应变传感。利用该技术的厘米级空间分辨率也首次测量了亚毫米宽度的混凝土，该技术是唯一能够以厘米级空间分辨率和数十赫兹采样测量沿着纤维的分布应变的技术。这些功能正在为材料和结构创建新的诊断算法，一种扩大测量范围的方案，一种同时测量应变和温度的方法，以及一种实现相当高空间的方案。至于第二个主题，也已提出并进行了实验。第三课题“光纤到户诊断系统”的空间分辨率提高了约40倍，达到20cm。网络“的测量范围得到了改善。在5公里长的光纤末端，以约10厘米的空间分辨率和1公里的测量范围测量了反射率分布。对于第四个主题“相关传感技术”，一个系统通过使用光学相干函数合成技术（SOCF），新开发了具有相同布拉格波长的复用光纤光栅，实现了使用具有多个激光波长的光纤激光器的采样率和随机存取能力，通过该研究项目，还提出并开发了通过 SOCF 控制 EDF 动态光栅特性的方案、测量沿光纤的振动分布的系统等。智能材料、结构和通信网络系统已成功开发。

项目成果

K.Hotate: "Application of synthesized coherence function to distributed optical sensing"IOP Measurement Science and Technology. Vol.13, No.11, Nov.. 1746-1755 (2002)

K.Hotate：“合成相干函数在分布式光学传感中的应用”IOP测量科学与技术。

K.Hotate: "Handbook of Photonic Information Technology (Ed. by T.Kamiya, Y.Arakawa, H.Ishio, M.Ohtsu, T.Mukai, M.Yamada and Y.Yamamoto)"Corona Publishing Co.Ltd.. (2003)

K.Hotate：“光子信息技术手册（T.Kamiya、Y.Arakawa、H.Ishio、M.Ohtsu、T.Mukai、M.Yamada 和 Y.Yamamoto 编）”Corona Publishing Co. Ltd.。

K.Hotate: "Application of synthesized coherence function to distributed optical sensing"IOP Measurement Science and Technology. 13・11. 1746-1755 (2002)

K.Hotate：“综合相干函数在分布式光学传感中的应用”IOP测量科学与技术1746-1755（2002）。

K.Hotate, M.Kashiwagi: "High spatial resolution reflectometry for optical subscriber networks by synthesis of optical coherence function with measurement range enhancement"IEICE Trans. on Electronics. E86-C・2. 213-217 (2003)

K.Hotate、M.Kashiwagi：“通过光学相干函数与测量范围增强的综合实现光学用户网络的高空间分辨率反射测量”IEICE Trans on Electronics。

K.Hotate, M.Enyama, S.Yamashita, Y.Nasu: "A multiplexing technique of fiber Bragg grating sensors with the same reflection wavelength by the synthesis of optical coherence function"Measurement Science and Technology. Vol.15, No.1, Jan.. 148-153 (2004)

K.Hotate、M.Enyama、S.Yamashita、Y.Nasu：“通过合成光学相干函数实现具有相同反射波长的光纤布拉格光栅传感器的复用技术”测量科学与技术。