| Affiliation: | 1. Graduate School of Engineering, Kansai University, 3-3-35 Yamate, Suita, Osaka 564-8680, Japan Uniopt Co., Ltd., 2102 Makigaya, Aoi-ku, Shizuoka 421-1221, Japan;2. Uniopt Co., Ltd., 2102 Makigaya, Aoi-ku, Shizuoka 421-1221, Japan;3. Tokyo University of Agriculture and Technology, 2-24-16 Nakamachi, Koganei, Tokyo 184-8588, Japan;4. Imoto Mechanical Engineering Co., Ltd., 501 Tsukinuke, Kamikyou, Kyoto 602-8315, Japan;5. Graduate School of Engineering, Kansai University, 3-3-35 Yamate, Suita, Osaka 564-8680, Japan |
| Abstract: | We produced a new system for measuring the small photoelastic constant of a polymer thin film with a small birefringence. Using our mesurement system, we evaluated the photoelastic constant of a polymer film in real time by quantitative analysis. Photoelastic constants of 11.30 × 10−12 Pa−1 for a cellulose triacetate film and 78.38 × 10−12 Pa−1 for a polycarbonate film were obtained. Furthermore, we obtained a small photoelastic constant of 0.12 × 10−12 Pa−1 for a cycloolefin film for liquid crystal displays, using our new measurement system. This value is very small. We emphasize that, if a small change in retardation and stress cannot be detected simultaneously using our system, then we cannot obtain such a small photoelastic constant. |
