Document Type and Number:
Japanese Patent JPS5078372
Kind Code:
A
Abstract:
Birefringence resulting from the relative retardation of light waves propagating at different speeds through a stressed plate or coating is measured automatically by splitting a light wave emerging from the stressed plate or coating into at least two beams, filtering each beam with a filter which transmits a different wave length, transforming the light intensity from each filter into electrical signals and using the electrical signals to measure the resulting phase shift which is directly proportional to the birefringence.
Application Number:
JP10702074A
Publication Date:
June 26, 1975
Filing Date:
September 17, 1974
Export Citation:
International Classes:
G01L1/00; G01B11/16; G01J4/04; G01N21/23; (IPC1-7): G01B19/49; G01N21/46