Patent ID: 8736835
Filing Date: 2014-05-27
Classification: G01J,G01N

Abstract:
1. A Raman sensor for detecting the concentration of a first species of interest and a second species of interest in a sample, the sensor comprising: a first reflector that exhibits a high reflectivity near the Raman shifted emission for the first species of interest and a moderate reflectivity near the Raman shifted emission for the second species of interest; a second reflector that exhibits a high reflectivity near the Raman shifted emission for the first species of interest and a moderate reflectivity near the Raman shifted emission for the second species of interest, positioned at a proximate end of an optical fiber and aligned substantially parallel to the first reflector, the second reflector separated from the first reflector by a distance to form a microcavity having a microcavity length equal to the distance between the first reflector and the second reflector, wherein the microcavity length is dependent upon the Raman transition of the first species of interest to be detected; an excitation laser positioned to emit at an excitation wavelength incident upon the first reflector and the second reflector, wherein the wavelength of the excitation laser is dependent upon the microcavity length between the first reflector and the second reflector; a first Raman emission signal detector positioned to receive the Raman emission coupled out of the first reflector and to detect the concentration of the first species of interest within a sample positioned between the first reflector and the second reflector; and a second Raman emission signal detector positioned to receive the Raman emission coupled out of the first reflector and to detect the concentration of the second species of interest within a sample positioned between the first reflector and the second reflector.