Patent ID: 8310671
Filing Date: 2012-11-13
Classification: G01J

Abstract:
1. A system for capturing a Raman scattering component and cancelling out a background fluorescence component of a sample, comprising: a first and a second pulsed laser that excites molecules in a sample; a frame-transfer charge-coupled device (FT-CCD) having an active area and operating in a continuous pixel-shift mode; an optical fiber that carries scattered laser light from the sample to the FT-CCD active area and projects the scattered laser light onto a portion of the active area, thus creating a subframe with minimal pixel height; wherein the Raman scattering component and background fluorescence induced by the first incident laser pulse is detected by a first subframe while the background-only component induced by the second incident laser pulse is detected by a second subframe; and whereby the system captures a pure Raman scattering component by cancelling out the background fluorescence component contained in the first subframe by the background-only component measured in the second subframe.