Method of and device for realtime measurement of the state of po

Details Method of and device for realtime measurement of the state of po Method of and device for realtime measurement of the state of po

1985-08-19

1987-06-09

Willis, Davis L.

Optics: measuring and testing

By particle light scattering

With photocell detection

356351, G01B 902

Patent

active

046716572

ABSTRACT:
Method and device for realtime measurement of the state of polarization at a quasi-monochromatic light beam. Two quasi-monochromatic radiations with slightly different optical frequencies are generated. A radiation is converted into a 45.degree. linearly polarized radiation, while the other presents the polarization state imposed by a body under test. In each radiation, horizontal and vertical polarization components are separated, and then recombined into two different beams comprising radiations at both frequencies, respectively polarized in the same plane. Beatings between the two components of each beam are originated and from the two electrical signals in the radiofrequency range thus obtained the information is extracted on the relative phase and the amplitude of the two components of the radiation with polarization imposed by the body under test.

REFERENCES:
patent: 3345907 (1967-10-01), Wada
patent: 3520615 (1970-07-01), Smith
patent: 4553841 (1985-11-01), Coppa et al.
patent: 4565449 (1986-01-01), Grego
Article entitled "Optical Communication Conference", Sep. 17-19, 1979--10.3-1-10.3-4.

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