Apparatus and methods for concentration determination using polarized light

摘要

Methods and apparatus for concentration determination using polarized light. The apparatus includes a first polarized light source having a first light source polarization axis and a second polarized light source having a second light source polarization axis generally perpendicular to the first light source polarization axis. Also, 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 and 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, wherein the first and second light receiver polarization axes are generally +/−45 degrees relative to the first and second light source polarization axes.

主权项

1. An apparatus comprising:
a first light source polarizer having a first light source polarization axis; a second light source polarizer having a second light source polarization axis generally perpendicular to the first light source polarization axis; a first light receiver polarizer having a first light receiver polarization axis; a first light receiver configured to measure an intensity of light transmitted from the first light receiver polarizer; a second light receiver polarizer having a second light receiver polarization axis substantially perpendicular to the first light receiver polarization axis; and a second light receiver configured to measure an intensity of light transmitted from the second light receiver polarizer; wherein the first and second light receiver polarization axes are generally +/−45 degrees relative to the first and second light source polarization axes.