Birefringent member cell gap measurement method and instrument

Details Birefringent member cell gap measurement method and instrument Birefringent member cell gap measurement method and instrument

1993-12-20

1995-07-18

Rosenberger, Richard A.

Optics: measuring and testing

By polarized light examination

With polariscopes

356382, G01B 1114, G02F 113

Patent

active

054346711

ABSTRACT:
A first polarizer and a second polarizer are located in an opposing relationship to each other on the optical axis of incident light with their polarization directions displaced from each other by a predetermined angle. A liquid crystal cell is arranged between the first polarizer and the second polarizer for rotation around the optical axis of the incident light. The incident light is introduced into the first polarizer while the liquid crystal cell is rotated. Transmission light, which is the incident light that has been transmitted successively through the first polarizer, the liquid crystal cell, and the second polarizer, is received by a photo-detector. The ratio between a variable component and a fixed component of the intensity of the transmission light is calculated. The cell gap of the liquid crystal cell is determined from the calculated ratio.

REFERENCES:
patent: 4368645 (1983-01-01), Glenn et al.
patent: 4973163 (1990-11-01), Sakai et al.
patent: 5239365 (1993-08-01), Inoue
Dill et al. "Ellipsometry with Pulsed Tunable Laser Sources" IBM Technical Disclosure Bulletin vol. 19, No. 4 (Sep. 1976) pp. 1487-1489.
Lien et al. "Cell Gap Measurement of Filled Twisted Nematic Liquid Crystal by a Phase Compensation Method" J. Appl. Phys. 69(3) 1 Feb. 1991 pp. 1304-1309.

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