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Improvement of functions in synthesis and scan of the optical co-herence function and its applications to distributed photonic sensing

光学相干函数合成和扫描功能的改进及其在分布式光子传感中的应用

基本信息

批准号：
07455166
负责人：
HOTATE Kazuo
金额：
$ 4.67万
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 (B)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

项目摘要

The author has invented a technique, in which optical coherence function can be synthesised in arbitrary shapes. Moreover, additional technique has also been invented to scan the function by using a phase modulation on the reference lightwave in the interferometer. In this research project, this principle is applied to construct new distributed sensing systems.At first, phase-modulationg Optical Coherence Domain Refrectomatry by Synthesis of CO-herence Function, p-OCDR for short, has been proposed. In the previous OCDR method, not only synthesising but also scanning the coherence function was carried out by the lasing frequency modulation of a semiconductor lase. On the contrary, in p-OCDR the scanning is done by the phase modulation, which results in increasing the accuracy of the synthesised shape. Deterioration factors in p-OCDR were considred to found the countermeasures, then 1.2mm resolution and -100 dB sensitivity have been realized. To diagnose divices at the end of optical sub … More scriber networks in the Fiber TO The Home system, new reflectometry with high spatial resolution and long range has also been proposed. Reflectivity distribution at about 5Km far end has successfully been measured with 6cm resolution. Next, p-OCDR has been applied to measure mode coupling distribution between two polalization eigen modes in a polalization maintaining fiber, which provide a distributed pressure sensing system. An experimental system has been constructed, which has shown the resolution of 9m and the measurable range of 1Km.We have also studied a method to mauti/demultiplex sensor outputs from fiber interfero-metric sensors. Phase information from one sensor has successfully been selected from others by using Synthesis of the Coherence Function Technique. Moreover, an optical tomography system has also been proposed utilising the thechnique, in which no mechanical moving part any calculation are needed.As described above, enough research results have been accululated on this research project. Less

作者发明了一种可以以任意形状合成光学相干函数的技术。此外，还发明了通过在干涉仪中的参考光波上使用相位调制来扫描函数的附加技术。在本研究项目中，将这一原理应用于构建新的分布式传感系统。首先，提出了一种基于相干函数合成的相位调制光相干域反射技术，简称p-OCDR。在以往的OCDR方法中，不仅合成相干函数而且扫描相干函数都是通过半导体激光器的激光频率调制来实现的。相反，在p-OCDR中，扫描是通过相位调制完成的，这导致了合成形状的精度增加。考虑了p-OCDR的劣化因素，提出了相应的对策，实现了1.2 mm的分辨率和-100分贝的灵敏度。诊断光子级…末尾的设备在光纤到户系统中增加了更多的划线网络，也提出了高空间分辨率和远距离的新的反射测量方法。用6 cm的分辨率成功地测量了约5公里远端的反射率分布。然后，应用p-OCDR测量了保偏光纤中两个偏振本征模之间的模式耦合分布，提供了一种分布式压力传感系统。搭建了一套实验系统，分辨率为9m，测量范围为1 Km，并研究了光纤干涉传感器输出的多路/多路分接方法。利用相干函数合成技术成功地从一个传感器中选择了来自其他传感器的相位信息。此外，还提出了一种利用该技术的光学层析成像系统，该系统不需要任何机械运动部分的任何计算。较少