Birefringence distribution measuring method

Details Birefringence distribution measuring method Birefringence distribution measuring method

1995-06-06

1996-12-24

Rosenberger, Richard A.

Optics: measuring and testing

By polarized light examination

With polariscopes

G01N 2123

Patent

active

055877931

ABSTRACT:
A sample is placed between a circular polarizer and an analyzer in an optical path between a monochromatic light source and a two-dimensional optical receiver. Parallel beams emitted from the monochromatic light source are converted into circularly polarized light by the circular polarizer. After transmitting the sample, the light is guided to the analyzer. While rotating the analyzer about the axis of the beams, image data are detected by optical receiver at a step of a regular rotation angle, and the detected image data are sampled to be sent to an image processing device in the next stage. On the basis of the image data, an operation is conducted on each pixel to obtain a relative phase difference due to birefringence of the sample, the two-dimensional birefringence distribution including the sign of the relative phase difference, and also the principal axis direction.

REFERENCES:
patent: 5257092 (1993-10-01), Noguchi et al.
"Solid-State Laser Engineering", Koechner, W., Third Completely Revised and Updated Edition, pp. 393-394, 1992.
Masato Noguchi et al., "Measurement of 2-D Birefringence Distribution" SPIE vol. 1720 (1992) pp. 367-378.
V. S. Chudakov, "Investigation of Induced Birefringence with a Rotating Polarization Element" Instrum. & Exper. Techn. vol. 20, (1977) pp. 241-244.
Otani et al., "Two-dimensional Birefringence Measurement Using the Phase Shifting Technique" SPIE vol. 1720, pp. 346-354 (1992).
Matsuura et al, "Measurement of flow-birefringence using a circularly polarized laser beam". Optics and Laser Technology vol. 10, No. 5 (Oct. 1978) pp. 237-240.

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