IR / NIR spectroscopic imaging technique is powerful tool to visualize the chemical distribution in objects. In addition, the combination of linear polarized light and IR / NIR spectroscopic imaging technique enables to visualize simultaneously the distributions of anisotropy and chemical composition in the materials. In this study, polarized IR / NIR spectroscopic imaging techniques were applied for the analysis of polymer products. NIR spectroscopic birefringence imaging technique was developed and applied for analyzing an injection molded polymer product. Two linear polarizers were inserted in the optical system of a push-bloom type NIR spectroscopic imaging system. The obtained NIR spectra changed depending on not only the chemical structure but also the birefringence of sample. The influence of birefringence on NIR spectrum was extracted by data post-processing, and the magnitude and direction of birefringence were calculated by curve fitting. By using proposed technique, it was succeeded to visualize the thickness distribution calculated using near-infrared absorption, and the birefringence image which reflected the flow history during injection molding.
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