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

作者已经发明了一种技术，可以在任意形状中综合光学连贯性。在可靠的OCDR方法中预测了合成f共晶函数的相位模式相干性，不仅是合成的，而且还通过半导体lase的激光调制进行了扫描。调制会增加p -OCDR中合成形状的准确性。，还提出了具有高空间分辨率和远距离的新反射测定法。显示了9m的分辨率和1公里的可测量范围。我们研究了纤维干扰素传感器的Mauti/Demultiplex传感器输出。如上所述，需要摩擦