Liquid-level sensor based on tapered chirped fiber grating

• 作 者: DONG XiaoWei LIU WenKai ZHAO RuiFeng
• 机 构: North China University of Technology,Institute of Lightwave Technology,Beijing Jiaotong University,
• 出 处: Science China(Technological Sciences)
• 发表日期: 2013年02期
• 关键词: grating bandwidth spatially optic absolute Bragg insensitive properly converted

An optic-fiber liquid-level sensor based on tapered chirped grating was proposed and demonstrated experimentally.With a properly designed column buoy hung to chain wheel,the liquid-level variation was converted to axial strain,which made the reflection spectrum of the tapered chirped grating narrowed or broadened correspondingly.And a high-sensitive liquid-level sensor was obtained by monitoring the bandwidth variation of the tapered chirped grating.Compared with traditional absolute wavelength or power detection,this special monitoring technique based on bandwidth modulation makes the liquid-level sensor insensitive to spatially uniform temperature variations and power fluctuations from down-lead or light source.

An optic-fiber liquid-level sensor based on tapered chirped grating was proposed and demonstrated experimentally .With a properly designed column buoy hung to chain wheel, the liquid-level variation was converted to axial strain, which made the reflection spectrum of the tapered chirped grating narrowed or broadened correspondingly. And a high-sensitive liquid-level sensor was obtained by monitoring the bandwidth variation of the tapered chirped grating. Compared with traditional absolute wavelength or power detection, this special monitoring technique based on bandwidth modulation makes the liquid-level sensor insensitive to spatially uniform temperature variations and power fluctuations from down-lead or light source.