Smartphone-based system for measuring liquid refractive index

Dingnan Deng; Yechang Yu; Chengguo Wang; Bin Huang; Xin Fu; Yuancong Zhong; Ruikai Chen

doi:10.1117/12.3001216

18 December 2023 Smartphone-based system for measuring liquid refractive index

Dingnan Deng, Yechang Yu, Chengguo Wang, Bin Huang, Xin Fu, Yuancong Zhong, Ruikai Chen

Proceedings Volume 12963, AOPC 2023: Optical Sensing, Imaging, and Display Technology and Applications; and Biomedical Optics; 1296308 (2023) https://doi.org/10.1117/12.3001216
Event: Applied Optics and Photonics China 2023 (AOPC2023), 2023, Beijing, China

Abstract

The liquid refractive index is one of the important optical parameters reflecting the properties of solution. A simple scheme based on shading effect for measuring liquid refractive index is presented. When a light beam passes through the liquid, the total reflection occurs at the interface with the air to produce a shading effect, forming a circular shading pattern, and its radius is related to the refractive index of the liquid. Based on this principle, a liquid refractive index measurement system based on smartphone is built. A rectangle colorimetric dish with tested liquid is illuminated by He-Ne laser. A white stickable label paper is attached to one side of colorimetric dish. Then the circular shading pattern displayed on label paper can be recorded by smartphone. A smartphone data processing program was developed to calculate the liquid refractive index from the image taken by smartphone. System calibration and smartphone shooting parameters are discussed in detail. The refractive index measurement experiments of sucrose solution and sodium chloride solution with different concentrations demonstrate the feasibility and effectiveness of the proposed method.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Dingnan Deng, Yechang Yu, Chengguo Wang, Bin Huang, Xin Fu, Yuancong Zhong, and Ruikai Chen "Smartphone-based system for measuring liquid refractive index", Proc. SPIE 12963, AOPC 2023: Optical Sensing, Imaging, and Display Technology and Applications; and Biomedical Optics, 1296308 (18 December 2023); https://doi.org/10.1117/12.3001216

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KEYWORDS

Refractive index

Liquids

Reflection

Calibration

Water

Industry

Interfaces

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