220 反射型レーザ光弾性実験装置の開発(OS6-5 光弾性法II)(OS6 実験力学の新展開)  [in Japanese] 220 Development of Reflecting Type Laser Photoelasticity  [in Japanese]

The reflection type laser photoelasticity that possesses high detection sensitivity of the birefringence measurement was developed to detect the stress of the film formed on the surfaces. A He-Ne Laser was used as a light source. The magnitudes of principal stress difference and the direction of the principal stress were obtained simultaneously and quantitatively using our equipment. This type of photoelasticity has a problem that the reflected light from film surface give rise to the error of measurement. We had investigated the influence of the reflected light from film surface for measurement value.