• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>ICO20: Optical Devices and Instruments >Theoretical analysis of sensing character of long period fiber grating coated with gas-sensitive film
【24h】

Theoretical analysis of sensing character of long period fiber grating coated with gas-sensitive film

机译：涂有气敏膜的长周期光纤光栅传感特性的理论分析

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Firstly we studied the sensitivity of long-period fiber gratings (LPFG) to the refractive index of ambient medium using the coupled modes theory. Then we presented numerical calculation based on long period fiber grating to show the relationship between the resonant wavelength of transmission spectrum and the ambient refractive index. Secondly we analyzed the optical mechanics of the semiconductor oxide film with gas-sensitivity and found that when touching the thin film gas can make its extinction coefficient, absorption coefficient and corresponding refractive index change. Thus we can coat the grating surface with gas-sensitive film and make use of the character that the refractive index will change with the component and density of ambient gas. Furthermore the change will influence the resonant wavelength of transmission spectrum of LPFG therefore we can get information about the gas component and density by way of monitoring changes of wavelength. The LPFG is more sensitive to ambient refractive index than fiber and the sensed signal is wavelength-modulated so the signal is not reflected by the fluctuation of light intensity and the fiber loss. Therefore the LPFG is more sensitive than intensity-type fiber gas sensor.
机译：首先，我们使用耦合模式理论研究了长周期光纤光栅（LPFG）对环境介质折射率的敏感性。然后，我们提出了基于长周期光纤光栅的数值计算，以显示透射光谱的谐振波长与环境折射率之间的关系。其次，我们以气体敏感性分析了半导体氧化膜的光学力学，发现当接触薄膜气体时，气体会使其消光系数，吸收系数和相应的折射率发生变化。因此，我们可以在光栅表面涂上一层气敏膜，并利用折射率随环境气体的成分和密度而变化的特性。此外，该变化将影响LPFG透射光谱的共振波长，因此我们可以通过监测波长的变化来获得有关气体成分和密度的信息。 LPFG比光纤对环境折射率更敏感，并且感应到的信号是经过波长调制的，因此信号不会被光强和光纤损耗的波动所反射。因此，LPFG比强度型光纤气体传感器更灵敏。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号