Optics: measuring and testing – By polarized light examination – With birefringent element
Patent
1994-12-07
1996-06-11
Gonzalez, Frank
Optics: measuring and testing
By polarized light examination
With birefringent element
356349, G01B 902
Patent
active
055261183
ABSTRACT:
A superheterodyne split-beam system is used to measure the refractive index distribution associated with a light scattering medium. Initially, a coherent light beam is split into a first reference light beam and a second light beam. The second light beam is passed through a light scattering medium. Scattered and unscattered portions of the second light beam are separated using the characteristic that the scattered light travels by a longer optical path length than the unscattered light. The first light beam is recombined with the unscattered light beam, and the associated optical path difference is measured. Using the difference between the calculated path difference and a predetermined reference path difference, as well as the thickness of the scattering medium, refractive indices are measured. The use of a photodetector array allows for determining a distribution of the refractive indexes of the inclusions at various portions of the medium.
REFERENCES:
patent: 4759628 (1988-07-01), Tatsuno et al.
patent: 5151752 (1992-09-01), Oono et al.
patent: 5321501 (1994-06-01), Swanson et al.
Miyagawa Ichirou
Toida Masahiro
Fuji Photo Film Co. , Ltd.
Gonzalez Frank
Kim Robert
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