Performance improvement of optical reflectometry and tomography with synthesis of optical coherence function

通过合成光学相干函数改进光学反射测量和断层扫描的性能

• 批准号: 09305030
• 负责人: HOTATE Kazuo
• 金额: $ 16.64万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09305030/
• 关键词: Reflectometry; Optical tomography; Coherence function; Photonic sensing; Brillouin scattering; Smart materials and structures; Diagnosis of lightwave networks; Distributed and multiplexed photonic sensing; 光ファイバ加入者系; トモグラフィー; ファトニックセンシング; 光加入者系

The purpose of this research is to improve the accuracy of "Synthesis of Optical Coherence Function (SOCF)", that is the original technology of the project reader. Various photonic functional systems, which are realized by using the SOCF, are also investigated in this project.Reflectometry systems for diagnosing devices at a long distance of about 5km through optical fibers in subscriber networks have been proposed and experimented. Spatial resolution of 6cm has been achieved at 5km distance. This performance ha not yet been realized by other systems. Optical systems to measure force distribution along a fiber have also been invented by applying the SOCF. Positions of polarization mode coupling in a high birefringent fiber due to the applied force can be measured with 9m resolution through 1km measurement range. Triangle shaped coherence function has also been applied to realize immediate positioning of the force, and digital processing has also been used to improve the accuracy. These … More systems can be used for smart structures and security systems. Multiplexed fiber optic interferometric sensors have demonstrated by using SOCF technology. Optical tomography system has also been invented, in which we need no data calculation and can simplify the mechanical scanning scheme. A system without any mechanical moving parts has also been constructed. A system for diagnosing each surface profile in optical media with multiple inner surfaces has also been realized. A fiber optic system for measuring stress distribution along a fiber has also been invented, in which frequency shift of Brillouin scattering in the fiber is used to measure the stress. Stimulated Brillouin scattering is localized by using SOCF technique with cm order spatial resolution. In the experiment, 6.5cm resolution has been demonstrated. On the contrary, spatial resolution limitation in traditional time domain technologies is only 1m.We believe that enough research results have been accumulated in this project. Less

本研究的目的是提高本项目阅读器原有的“光学相干函数综合”技术的精度。本计画也研究了利用SOCF所实现的各种光子功能系统，并提出并实验了透过光纤在约5km远距离的用户网路中诊断装置的反射量测系统。在5km的距离上，空间分辨率达到6cm。这种性能还没有被其他系统实现。通过应用SOCF，还发明了测量沿着纤维的力分布的光学系统。在1km的测量范围内，可以测量高双折射光纤中由于外力作用而引起的偏振模耦合位置，其分辨率为9m。采用三角形相干函数实现力的实时定位，并采用数字处理提高精度。这些 ...更多信息 系统可用于智能结构和安全系统。多路复用光纤干涉传感器已被证明使用SOCF技术。光学层析成像系统也被发明出来，它不需要数据计算，可以简化机械扫描方案。一个没有任何机械运动部件的系统也已建成。还实现了一种用于诊断具有多个内表面的光学介质中的每个表面轮廓的系统。还发明了一种用于测量沿着光纤的应力分布的光纤光学系统，其中利用光纤中布里渊散射的频移来测量应力。利用具有cm级空间分辨率的SOCF技术对受激布里渊散射进行了定域。在实验中，6.5cm的分辨率已被证明。而传统时域技术的空间分辨率极限仅为1 m，相信本课题已经积累了足够的研究成果。少

项目成果

K. Hotate Fiber Sensor Technology Today<Invited>: "Optics Fiber Technology(Academic Press)"3.. 1997. 402 (356)

K. Hotate当今光纤传感器技术<特邀>：《光纤技术（学术出版社）》3.. 1997. 402 (356)

Z. -Y. He and K. Hotate: "Synthesized optical coherence tomography for scattering objects using stepwise frequency modulated tunable laser."Optics Letters.. vol. 24, no. 21. 1502-1504 (1999)

Z.-Y。

Z. Y. He N. Mkohzaka,and K. Hotate: "Selective image extraction by synthesis of the coherence function using two dimensional optical lock-in amplifier with microchannel spatial light modulator"IEEE Photonics Technology Letters. 9.4. 514-516 (1997)

Z. Y. He N. Mkohzaka 和 K. Hotate：“使用二维光学锁定放大器和微通道空间光调制器合成相干函数来选择性图像提取”IEEE 光子技术快报。

K.Hotate,X.Song and Z-Y.He: "Stress-location measurement along an optical fiber by synthesis of optical coherence function"Proc. SPIE Fiber Optic and Laser Sensors and Applications. SPIE3860. 296-303 (1999)

K.Hotate，X.Song和Z-Y.He：“通过合成光学相干函数进行沿光纤的应力定位测量”Proc。

K. Hotate and T. Hasegawa: "Measurement of Brillouin gain spectrum distribution along an optical fiber using a correlation-based techinque-Proposal,experiment and simulation-"IEICE Trans. on Electronics. E83-C・3. to be published (2000)

K. Hotate 和 T. Hasekawa：“使用基于相关的技术测量沿光纤的布里渊增益谱分布 - 提案、实验和模拟 -”IEICE Trans on Electronics（2000 年）。 ）