Apparatus for obtaining refractive index distribution information of light scattering media
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United States of America Patent
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Jun 11, 1996
Grant Date -
N/A
app pub date -
Dec 7, 1994
filing date -
Dec 7, 1993
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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.
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