Birefringence measuring apparatus and method of measuring birefringence

摘要: Transmission light from a detection lens is directed to polarization element as incident light. The rotated, and the received detected by an array-state light-receiving element, birefringence of calculated. distance between for radiating diffusion onto itself can be optionally set. Observing transmission image lens, determined. Thereby, it possible obtain optical elasticity interference fringes which at most are scarcely affected distortions. In addition, focusing magnification rate suitably set match states occurrence different in accordance with or placement thereof. A compensation system composed respectively has focal distances f1 f2 main scanning direction subscanning direction, added into space radiation lens. substantially parallel.