Basic study on novel fiber-optic distributed strain sensor with very high resolution using Rayleigh backscattering

基于瑞利背向散射的新型超高分辨率光纤分布式应变传感器的基础研究

• 批准号: 14550410
• 负责人: KOYAMADA Yahei
• 金额: $ 2.5万
• 依托单位: Ibaraki University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14550410/
• 关键词: Fiber sensor; Strain sensor; Temperature sensor; Distributed sensor; Rayleigh scattering; OTDR; 歪・温度測定

We have proposed previously a novel technique for measuring distributed strain and temperature in a fiber with a very high measured resolution. This technique makes use of the jagged appearance of Rayleigh backscatter traces from a single-mode fiber measured by using a coherent OTDR with a precisely frequency-controlled light source. In order to make clear the potential of this sensing technique, we have conducted numerical simulations and experiments. The experimental results confirmed the following basic characteristics of the Rayleigh backscatter traces that are essential as regards our sensing technique.(1) The OTDR trace always exhibits an identical waveform when the sensing fiber is placed under the same conditions (strain and temperature).(2) The waveform of the OTDR trace varies as the strain or the temperature changes, but the initial waveform can be reproduced by adjusting the laser frequency.Our numerical simulations indicated the possibility of measuring strain distribution with a resolution of 0.1/1 με and a spatial resolution of 1/0.1 m for a 40/8 km long fiber.

我们已经提出了一种新型技术，用于测量具有非常高的分辨率的纤维中分布式应变和温度。该技术利用了通过使用具有精确频率控制的光源的连贯的OTDR测量的单模光纤的雷利反向散射痕迹的锯齿状外观。为了清除这种传感技术的潜力，我们进行了数值模拟和实验。 The experimental results confirmed the following basic characteristics of the Rayleigh backscatter traces that are essential as regards our sensitivity technique.(1) The OTDR trace always exhibits an identical waveform when the sensitivity fiber is placed under the same conditions (strain and temperature).(2) The waveform of the OTDR trace ranges as the strain or the temperature changes, but the initial waveform can be reproduced by adjusting the laser frequency.Our numerical simulations表明40/8 km长纤维的分辨率为0.1/1με，空间分辨率为1/0.1 m。

项目成果

Novel fiber-optic distributed strain and temperature sensor with very high resolution

• DOI: 10.1093/ietcom/e89-b.5.1722
• 发表时间: 2006-05-01
• 期刊: IEICE TRANSACTIONS ON COMMUNICATIONS
• 影响因子: 0.7
• 作者: Koyamada, Yahei;Eda, Yousuke;Hogari, Kazuo
• 通讯作者: Hogari, Kazuo