Non-uniform refractive index field measurement based on light field imaging technique

Xiaokun Du; Yumin Zhang; Mengjie Zhou; Dong Xu

doi:10.1117/12.2306002

20 February 2018 Non-uniform refractive index field measurement based on light field imaging technique

Xiaokun Du, Yumin Zhang, Mengjie Zhou, Dong Xu

Proceedings Volume 10697, Fourth Seminar on Novel Optoelectronic Detection Technology and Application; 1069709 (2018) https://doi.org/10.1117/12.2306002
Event: Fourth Seminar on Novel Optoelectronic Detection Technology and Application, 2017, Nanjing, China

Abstract

In this paper, a method for measuring the non-uniform refractive index field based on the light field imaging technique is proposed. First, the light field camera is used to collect the four-dimensional light field data, and then the light field data is decoded according to the light field imaging principle to obtain image sequences with different acquisition angles of the refractive index field. Subsequently PIV (Particle Image Velocimetry) technique is used to extract ray offset of each image. Finally, the distribution of non-uniform refractive index field can be calculated by inversing the deflection of light rays. Compared with traditional optical methods which require multiple optical detectors from multiple angles to synchronously collect data, the method proposed in this paper only needs a light field camera and shoot once. The effectiveness of the method has been verified by the experiment which quantitatively measures the distribution of the refractive index field above the flame of the alcohol lamp.

Citation Download Citation

Xiaokun Du, Yumin Zhang, Mengjie Zhou, and Dong Xu "Non-uniform refractive index field measurement based on light field imaging technique", Proc. SPIE 10697, Fourth Seminar on Novel Optoelectronic Detection Technology and Application, 1069709 (20 February 2018); https://doi.org/10.1117/12.2306002

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