Accession Number : AD0287606

Title :   SOME NEW TECHIQUES FOR SCATTERED LIGHT PHOTO-ELASTICITY

Corporate Author : BOEING SCIENTIFIC RESEARCH LABS SEATTLE WASH

Personal Author(s) : CHENG,Y.F.

Report Date : SEP 1962

Pagination or Media Count : 1

Abstract : ome new techniques in determining the directions of the secondary principal stresses and their difference in scattered light photoelasticity are described. Experiments were made for cases where the secondary principal axes remain constant and good agreements were found. It was noted that if the light vector parallels with one secondary principal axis, the intensity for observation along this axis will be a minimum. We lso noted that the light vector rotates with the secondary principal plane along which it entered, and produces a component in the transverse direction of negligble amplitude. If a plane polarized beam coincides with one secondary principal plane at the point of entrance, it wll continue to coincide with this plane as it rotates. Based on these facts, the secondary principal axes at an interior point are determined by setting the polrizer with its axis parllel to one secondary pincipal axis at the point of entrance. Rote the rection of observation about the axis of propagation until the light intensity at the point reaches a minimum. The direction of observation will then coincide wth one secondary pincipal axis at the point. (Author)

Descriptors :   *LIGHT, *WAVE PROPAGATION, PHOTOELASTICITY, POLARIZATION, PROPAGATION, REFRACTION, SCATTERING

Distribution Statement : APPROVED FOR PUBLIC RELEASE