DEVICE FOR MEASURING OPTICAL DIFFERENCE IN RAY PATHS IN PHOTOELASTIC MEDIUMS Russian patent published in 1995 - IPC

FIELD: instruments. SUBSTANCE: device has double-beam interferometer which has semitransparent mirror serving as light divider and two opaque mirrors, two polarizers which polarization planes are relatively perpendicular. Each polarizer is mounted in corresponding branch of interferometer. In addition device has compensator, analyzer, tray with liquid where tested sample is located. Non-monochrome light source, additional polarizer mounted at the interferometer input, additional mirror, reference plate located in comparing branch of interferometer, active compensator of Babinet-Solleil type, which is located before analyzer, are introduced to accomplish the goal of invention. Part of optical system that has semitransparent mirror, two polarizers, tested sample, reference plate, two opaque mirrors, additional mirror is placed in tray with liquid which refractive index is close to refractive index of tested sample. Tray has two transparent walls which are perpendicular to the direction of light beam. Light beam enters interferometer and leaves it from these transparent walls. EFFECT: increased functional capabilities. 3 cl, 2 dwg