Sub-micrometer resolution liquid level sensor based on a hollow core fiber structure

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Abstract

Liquid level measurement in lab on a chip (LOC) devices is a challenging task due to the demand for a sensor with ultra-high resolution but miniature in nature. In this Letter, we report a simple, compact in size, yet highly sensitive liquid level sensor based on a hollow core fiber (HCF) structure. The sensor is fabricated by fusion splicing a short section of HCF between two singlemode fibers (SMFs). Sensor samples with different lengths of HCF have been studied; it is found that the sensor with a HCF length of ∼4.73  mm shows the best sensitivity of ∼0.014  dB/μm, corresponding to a liquid level resolution of ∼0.7  μm, which is over five times higher than that of the previous reported fiber optic sensors to date. In addition, experimental results have demonstrated that the proposed sensor shows good repeatability of measurement and a very low cross sensitivity to changes in the refractive index of the surrounding medium.
Original languageEnglish
Pages (from-to)2125
Number of pages2128
JournalOptics Letters
Volume44
Issue number8
DOIs
Publication statusPublished - 15 Apr 2019

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