It is possible to visualize birefringent phase differences (distortions) and the flow direction/stress direction (principal axis orientation)!
Plastic molded products made by injection molding undergo processes such as resin melting, filling into molds, cooling, and pressure holding. If these conditions are not appropriate, internal stress (residual stress) may remain, leading to molding defects. The two-dimensional birefringence measurement system can visualize birefringent phase differences (strain) and flow direction/stress direction (principal axis orientation), which are indicators of that stress. As an example, we will introduce a birefringence evaluation comparing polystyrene (PS) molded products under different heating conditions. 【Device Principle】 ■ When light is applied to a transparent body with birefringence, its polarized state changes. ■ By using a birefringence measurement device, it is possible to visualize the polarization information with a dedicated polarization image sensor. ■ By using wavelengths of 523nm, 543nm, and 575nm, birefringence can be evaluated by comparing the polarized states before and after passing through the transparent body. *For more details, please refer to the PDF document or feel free to contact us.
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Aites was established in 1993, originating from the quality assurance department of the IBM Japan Yasu office. Based on the technical expertise cultivated through cutting-edge defect analysis and reliability assurance of electronic components at the IBM Japan Yasu office, we have provided various products and services that support the development and manufacturing of semiconductors, displays, organic EL, solar cells, and electronic components to customers both domestically and internationally.