Interference-free optical detection for Raman spectroscopy

US8310671B1 · kind B1 · utility

Assignee

• The United States of America as represented by the Administrator of the National Aeronautics and Space Administration · US

Inventors

• Quang-Viet Nguyen · Aldie, US
• David G Fischer · Broadview Heights, US
• Jun Kojima · Tokyo, JP

Key dates

• Filing date: Sep 29, 2010
• Grant date: Nov 13, 2012
• Expiry date: May 17, 2031

Classification

• Technology area (CPC G): Physics
• CPC primary: G01J3/44
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

An architecture for spontaneous Raman scattering (SRS) that utilizes a frame-transfer charge-coupled device (CCD) sensor operating in a subframe burst gating mode to realize time-resolved combustion diagnostics is disclosed. The technique permits all-electronic optical gating with microsecond shutter speeds (<5 μs), without compromising optical throughput or image fidelity. When used in conjunction with a pair of orthogonally-polarized excitation lasers, the technique measures time-resolved vibrational Raman scattering that is minimally contaminated by problematic optical background noise.