Patent ID: 9677997
Date: 2017-06-13
CPC Classifications: A61M,G01J,G01N

Claim:
1. An apparatus comprising: a first polarized light source having a first light source polarization axis; a second polarized light source having a second light source polarization axis generally perpendicular to the first light source polarization axis; a first polarized light receiver having a first polarized light receiver polarization axis and configured to measure an intensity of light transmitted from the first light receiver polarizer; a second polarized light receiver having a second polarized light receiver polarization axis substantially perpendicular to the first light receiver polarization axis and configured to measure an intensity of light transmitted from the second light receiver polarizer; and a test region, at least a portion of the test region at least partially disposed between the first and second light source polarizers and the first and second light receiver polarizers.