203 構造複屈折波長板アレイカメラを用いた偏光画像解析による実時間変位測定法(セッション6)

概要

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A snap-shot imaging and subsequent phase analysis method is proposed for an interferoemtry using a CCD camera with micro-retarder array. An optical setup of a polarization interferometry using a twyman-green interferometer with two polarizers is constructed to analyze the distribution of out-of-plane displacement. A light emerging from the interferometer is recorded by a CCD camera that has micro-retarder array on the CCD plane. This micro-retarder array has four different principal directions. That is, an image obtained by the CCD camera contains four information corresponding to four different angles of the retarder. The four images separated from the image recorded by the CCD camera are reconstructed by a gray level interpolation scheme. Then, the distributions of the Stokes parameters that represent the state of polarization are calculated from the four images. The phase distribution of the fringe pattern produced by the twyman-green interferometer is then calculated from the Stokes parameters. It is emphasized that this method is applicable to time-dependent phenomena in which good repeatability and reproducibility of experiments are not expected, since multiple exposures are not necessary for sufficient data acquisition in the completion of phase analysis.
一般社団法人日本機械学会の論文
2005-03-13