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Development of highly sensitive optical fiber sensor system for wide-area disaster prevention

广域防灾高灵敏光纤传感器系统研制

基本信息

批准号：
18510145
负责人：
KOBAYASHI Takao
金额：
$ 2.39万
依托单位：
University of Fukui
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2006
资助国家：
日本
起止时间：
2006 至 2007
项目状态：
已结题

项目摘要

The purpose of the research is to develop a new optical fiber sensor system for sensing and collecting remote information of strain, temperature and earthquake amplitude of architectures in wide area The Bragg grating Doer sensor was fabricated and a new strain analyzing system was developed fir practical use in various applications.(1) Fabrication of FBG fiber sensors using the ultra-short pulsed laser The Bragg grating sensor has been inscribed in the single-mode silica fiber by using a Ti: Sapphire mode-locked laser system with 150 fs duration. Point-by-point method was applied and a reflection of -25db was obtained in 1550 nm wavelength spectrum. The sensors are designed for use of the FBG-OTDR sensing system.(2) Development of FBG-OTDR sensing system for strain and temperature measurement.A new sensing system called FBG-OTDR scheme has been developed fir sensing a position and magnitude of strain of the FBG sensors. Accuracy of the strain measurement is 5x10^<-6> with sensor spatial resolution of 15cm for maximum distance over 30km and temperature range of 0〜500 degree C in lms time resolution.(3) Extremely multi-point sensing capabilityBy using low reflectivity FBG sensors, multi-point sensors can be distributed in a single fiber with 1,000 points in this system and can be extended over several 10_4 FBG sensors in the modified system. The system has potential for low-cost practice sensing of wide-area artificial structures for prevention of disaster.

本研究的目的是开发一种新型的光纤传感器系统，用于广域范围内建筑应变、温度和地震振幅的远程传感和采集。本文制作了布拉格光栅多尔传感器，并开发了一种新的应变分析系统，用于各种实际应用。利用持续时间为150 fs的Ti: Sapphire锁模激光系统将Bragg光栅传感器嵌入单模二氧化硅光纤中。采用逐点法，在1550 nm波长光谱中得到-25db的反射。传感器设计用于FBG-OTDR传感系统。(2) FBG-OTDR应变和温度传感系统的研制。本文提出了一种新的传感系统FBG- otdr方案，用于传感光纤光栅传感器的应变位置和应变大小。应变测量精度为5x10^<-6>，传感器空间分辨率为15cm，最大距离超过30km，温度范围为0 ~ 500℃，时间分辨率为lms。(3)极好的多点传感能力通过使用低反射率光纤光栅传感器，多点传感器可以分布在单根光纤中，在该系统中有1000个点，并且可以扩展到改进系统中的多个10_4光纤光栅传感器上。该系统具有低成本的广域人工结构防灾实践传感潜力。