Liquid level sensor based on an excessively tilted fibre grating

Chengbo Mou*, Kaiming Zhou, Zhijun Yan, Hongyan Fu, Lin Zhang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

We propose and demonstrate an optical liquid level sensor based on the surrounding medium refractive index (SRI) sensing using an excessively tilted fibre grating (ETFG). When the ETFG submerged in water, two sets of cladding modes are coupled, corresponding to air- and water-surrounded grating structures, respectively. The coupling strengths of the two sets of cladding modes evolve with the submerging length of the grating, providing a mechanism to measure the liquid level. Comparing with long-period fibre grating based liquid level sensor, the ETFG sensor has a much higher SRI responsivity for liquids with refractive index around 1.33 and a lower thermal cross sensitivity.

Original languageEnglish
Pages (from-to)271-275
Number of pages5
JournalOptics Communications
Volume305
Early online date21 May 2013
DOIs
Publication statusPublished - 15 Sep 2013

Keywords

  • fibre bragg grating
  • tilted fibre grating
  • fibre sensor
  • level sensor

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