An ultra-sensitive liquid-level indicator based on an etched chirped-fiber bragg grating

Hung Ying Chang, Yu-Chung Chang, Hao Jan Sheng, Ming Yue Fu, Wen Fung Liu, Raman Kashyap

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29 Citations (Scopus)


A novel ultra-sensitive liquid-level indicator using an etched chirped fiber Bragg grating is experimentally demonstrated with a sensitivity of 1.214 nm/mm for detecting tens of micro-meter liquid-level variation. The operation mechanism is based on the superposition wavelength-peak shift created by the overlap between the spectrum of the etched CFBG section immersed in the liquid and the spectrum of the rest of the grating in air. This sensor may be used to precisely measure the liquid-level variation in bio-hazardous systems or industrial containers that demand accurate interrogation of the amounts of the contents.

Original languageEnglish
Article number2494611
Pages (from-to)268-271
Number of pages4
JournalIEEE Photonics Technology Letters
Issue number3
Publication statusPublished - 2016 Feb 1


All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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