A fiber-optic liquid sensor for simultaneously measuring refractive index, surface tension, contact angle and viscosity

Ai Zhou; Jun Yang; Binbin Liu; Libo Yuan

doi:10.1117/12.834975

5 October 2009 A fiber-optic liquid sensor for simultaneously measuring refractive index, surface tension, contact angle and viscosity

Ai Zhou, Jun Yang, Binbin Liu, Libo Yuan

Author Affiliations +

Proceedings Volume 7503, 20th International Conference on Optical Fibre Sensors; 75033B (2009) https://doi.org/10.1117/12.834975
Event: 20th International Conference on Optical Fibre Sensors, 2009, Edinburgh, United Kingdom

Abstract

A novel fiber-optic liquid sensor was proposed for simultaneously measuring some liquid properties such as concentration, refractive index, surface tension, contact angle and viscosity. Based on the effect of surface tension, tested liquid around fiber probe was pulled upward by the probe. When the balance between the surface tension and gravity was broken, a liquid drop was formed on the end face of the probe. The liquid drop can be regarded as a plane-convex lens, and the light transmission path was affected by the geometrical parameters and refractive index of the drop. The liquid samples (alcohol, water, oil and sucrose) were analyzed using FDLAT. The experimental results indicated that FDLAT can be used for liquid testing and monitoring.

Citation Download Citation

Ai Zhou, Jun Yang, Binbin Liu, and Libo Yuan "A fiber-optic liquid sensor for simultaneously measuring refractive index, surface tension, contact angle and viscosity", Proc. SPIE 7503, 20th International Conference on Optical Fibre Sensors, 75033B (5 October 2009); https://doi.org/10.1117/12.834975

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