Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 15, 2021 - September 17, 2021
Polarizing microscopes visualize the optical retardation of light transmitted through a substance and show the anisotropy of the refractive index of that. However, it is difficult to quantitatively evaluate the anisotropy of the refractive index field. Therefore, in this study, by combining a high-speed camera with a laser photoelastic method using a photoelastic modulator (PEM), we acquire a quantitative optical retardation field together with a microscopic image. To verify the performance of the apparatus, the stress distribution at the edge of a semicircular notch in a glass plate was measured under a 20 N tensile load. Then, it was compared with the FEM analysis value. As a result, stresses of about 3 MPa were distributed at the notch edge in both cases, and the results were generally consistent with each other. However, there is a room for improvement such as a stress being detected where the optical retardation should be zero.
