A study on the Birefringence Measurement in Injection Molded Parts using R-G-B separation of white Light

백색광의 R-C-B 성분 분해에 의한 사출품내의 복굴절 측정법 개발

Recently, injection molded plastic optical products are widely used, because injection molding process has advantages of low cost and high productivity. However, there remains residual birefringence and residual stresses originated from flow history and differential cooling. The present study focused on developing a technique measuring birefringence in optical plastic parts using R-G-B separation of white light. The main idea of an analysis comes from the fact that more information can be obtained from the distribution of retardation caused by different wavelengths. A complete system to give the quantitative values of retardation covering high order 2-D birefringence will be demonstrated. Further investigation is under way to improve the accuracy of the system using diodes as light sources.