Surface tension coefficient of liquid sensor based on FBG

A highly accuracy optical fiber sensor based on a fiber Bragg grating (FBG) is proposed and demonstrated for surface tension coefficient of liquid (STCL) measurement. In the experiment, pull-off method is applied to measure the STCL, and FBG is used as a high precision tension sensor. The performance is minutely studied in the surface tension coefficient of water measurement. The experimental results showed that the Bragg wavelength can be used to assess the STCL, and the average absolute percentage deviation of measurements from the correlation of the surface tension coefficient of water is just 0.4%. In order to show that the sensor has the versatility of other STCL measurement, surface tension coefficients of NaCl solution, and sucrose solution with different concentrations are experimentally measured. The results showed that the sensor presented higher accuracy. The STCL measurement system based on FBG has the advantages of simple structure, cost-effectiveness, and high accuracy. It can offer an alternative scheme for high accuracy STCL measurement in the fields such as surface physics, surface chemistry, and medicine.

Abstract licence: CC BY-NC-ND

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