Measurement of liquid refractive index based on electrically tunable lens

Dingnan Deng; Xiaoqian Zhang; Jingfu Zhang; Haolin Tang; Ketian Ou; Hongxiu Lian; Jinming Luo; Yuancong Zhong

doi:10.1117/12.3001240

18 December 2023 Measurement of liquid refractive index based on electrically tunable lens

Dingnan Deng, Xiaoqian Zhang, Jingfu Zhang, Haolin Tang, Ketian Ou, Hongxiu Lian, Jinming Luo, Yuancong Zhong

Proceedings Volume 12963, AOPC 2023: Optical Sensing, Imaging, and Display Technology and Applications; and Biomedical Optics; 1296309 (2023) https://doi.org/10.1117/12.3001240
Event: Applied Optics and Photonics China 2023 (AOPC2023), 2023, Beijing, China

Abstract

We present a simple and stable liquid refractive index measurement technique via electrically tunable lens (ETL). A focal point is produced when the parallel light passes through a convex lens. If a parallel plate with tested liquid is placed behind the lens, the position of focal point will be changed, which reflect the change of liquid refractive index. The axial displacement of focus point can be obtained by moving the camera and used to calculate the liquid refractive index. To avoid the mechanical movement of system, the convex lens is replaced by an electrically tunable lens. By exactly controlling the external currents of the ETL, the position of focal point can remain unchanged after placing the parallel plate with tested liquid. The change of focal length can be obtained by the change of external currents, which equal to the axial displacement of focus point. Thus, the liquid refractive index can be measured with the change of focal length. Some experiments of water, blend oil and 75% alcohol for measuring the liquid refractive index 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, Xiaoqian Zhang, Jingfu Zhang, Haolin Tang, Ketian Ou, Hongxiu Lian, Jinming Luo, and Yuancong Zhong "Measurement of liquid refractive index based on electrically tunable lens", Proc. SPIE 12963, AOPC 2023: Optical Sensing, Imaging, and Display Technology and Applications; and Biomedical Optics, 1296309 (18 December 2023); https://doi.org/10.1117/12.3001240

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KEYWORDS

Liquids

Refractive index

Cameras

Water

Calibration

Refraction

Geometrical optics

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