Research on the Second Bragg Diffraction from Brillouin Dynamic Grating in an Optical Fiber and its Sensing Application

光纤布里渊动态光栅二次布拉格衍射及其传感应用研究

• 批准号: 23656261
• 负责人: HOTATE Kazuo
• 金额: $ 2.58万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Challenging Exploratory Research
• 财政年份: 2011
• 资助国家: 日本
• 起止时间: 2011 至 无数据
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-23656261/
• 关键词: 計測システム; 光ファイバセンサ; スマート材料・構造; 分布型センシング; 防災危機・管理技術

It has been tried to observe the second Bragg diffraction from the Brillouin dynamic grating(BDG), for which our group had discovered to be associated with stimulated Brillouin scattering. Theoretical consideration on this phenomenon has also been performed. At first, the second Bragg diffraction from a FBG has successfully been observed at the wavelength of 6nm shorter than half the first diffraction wavelength, which has met well with the theoretical estimation. It has also been calculated that the spectral width of the BDG second diffraction is narrower than 10MHz, and the experimental setup to meet the requirements has been constructed. A possible spectrum has been observed around 779. 94nm, though it has not yet been confirmed because of the repeatability.

我们尝试观察布里渊动态光栅（BDG）的第二次布拉格衍射，我们的研究小组发现它与受激布里渊散射有关。对此现象也进行了理论思考。首先，在比第一衍射波长一半短的6nm波长处成功观察到了FBG的第二次布拉格衍射，这与理论估计相吻合。经计算，BDG二次衍射谱宽窄于10MHz，搭建了满足要求的实验装置。在 779. 94nm 附近观察到了可能的光谱，但由于可重复性尚未得到证实。

项目成果

ポンプ・プローブ時分割発生法を用いたBOCDA法によるブリルアンダイナミックグレーティングに基づく温度と歪の分離・分布測定

基于布里渊动态光栅的BOCDA方法采用泵浦探针分时生成法进行温度和应变的分离和分布测量

• 发表时间: 2012
• 作者: 芦田哲郎;岸 眞人;何 祖源;保立和夫
• 通讯作者: 保立和夫

Discriminative distributed measurement of strain and temperature based on Brillouin dynamic grating by BOCDA with time-division pump-probe generation scheme

基于布里渊动态光栅的 BOCDA 时分泵浦探针生成方案的应变和温度判别式分布式测量

• 发表时间: 2012
• 作者: T. Ashida;M. Kishi;Z. He;and K. Hotate
• 通讯作者: and K. Hotate