Patent ID: 8958071
Filing Date: 2015-02-17
Classification: G01N

Abstract:
1. An optical sensor comprising: a channel configured to transport a fluid material to be examined; a first waveguide positioned adjacent to the channel and configured to guide radiation through the channel; a first tunable grating defined on the first waveguide and configured to variably define a first cavity for selecting a first wavelength of the radiation for the first waveguide; a second waveguide positioned adjacent to the channel; a second tunable grating defined on the second waveguide and configured to variably define a second cavity for selecting a second wavelength for the second waveguide; a first tuning element positioned adjacent the first tunable grating and configured to independently alter the first tunable grating, thereby changing a resonance of the first tunable grating; and a second tuning element positioned adjacent the second tunable grating and configured to independently alter the second tunable grating, thereby changing a resonance of the second tunable grating, wherein the first tuning element and the second tuning element each comprise at least one of a mechanical tuning element, an optical tuning element, and an electrical tuning element.