20 February 2018 Non-uniform refractive index field measurement based on light field imaging technique
Author Affiliations +
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.
© (2018) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Xiaokun Du, Xiaokun Du, Yumin Zhang, Yumin Zhang, Mengjie Zhou, Mengjie Zhou, Dong Xu, 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); doi: 10.1117/12.2306002; https://doi.org/10.1117/12.2306002

Back to Top