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24 October 2006 A novel description of refractive index in irregular inhomogeneous optical medium
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Abstract
The refractive index distribution in atmosphere or fluid medium is irregular and inhomogeneous, and cannot be described by a usual gradient index formula due to the influence of flowage and change of temperature. In this paper a novel method, namely, self-adaptive grid is used for describing the refractive index in irregular inhomogeneous medium, the refractive index data are stored in RAM as a dynamic octree, the criterion of grid division for refractive index and its gradient are given and the interpolation method is used for calculating the refractive index and its gradient at positions along the ray trace trajectory. A gradient index (GRIN) rod in which the refractive index can be described by a formula is also analysis as an example, the self-adaptive grid is created and the refractive indexes and its gradient at some positions with high accuracy are output. The RMS error is under 7e-5 and can be used for ray tracing.
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Chunsheng Liu, Xingliang Yin, Tianxu Zhang, Shitao Deng, and Xiaotong Li "A novel description of refractive index in irregular inhomogeneous optical medium", Proc. SPIE 6357, Sixth International Symposium on Instrumentation and Control Technology: Signal Analysis, Measurement Theory, Photo-Electronic Technology, and Artificial Intelligence, 63571E (24 October 2006); https://doi.org/10.1117/12.716974
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