Title: Combined raman and IR fiber-based sensor for gas detection

Abstract

A double-pass fiber-optic based spectroscopic gas sensor delivers Raman excitation light and infrared light to a hollow structure, such as a hollow fiber waveguide, that contains a gas sample of interest. A retro-reflector is placed at the end of this hollow structure to send the light back through the waveguide where the light is detected at the same end as the light source. This double pass retro reflector design increases the interaction path length of the light and the gas sample, and also reduces the form factor of the hollow structure.

Inventors:

Carter, Jerry C; Chan, James W; Trebes, James E; Angel, Stanley M; Mizaikoff, Boris

Issue Date:

Tue Jun 24 00:00:00 EDT 2014

Research Org.:

Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Org.:

USDOE

OSTI Identifier:

1135723

Patent Number(s):

8759767

Application Number:

12/545,566

Assignee:

Lawrence Livermore National Security, LLC (Livermore, CA); University of South Carolina (Columbia, SC); Georgia Tech Research Corporation (Atlanta, GA)

Patent Classifications (CPCs):

G - PHYSICS G01 - MEASURING G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES

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G - PHYSICS G01 - MEASURING G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES

G01N2021/6482 - {Sample cells, cuvettes}
G01N2021/653 - {Coherent methods [CARS]}
G01N21/3504 - for analysing gases, e.g. multi-gas analysis
G01N21/645 - {Specially adapted constructive features of fluorimeters}
G01N21/65 - Raman scattering
G01N21/658 - {enhancement Raman, e.g. surface plasmons}

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DOE Contract Number:  

AC52-07NA27344

Resource Type:

Patent

Resource Relation:

Patent File Date: 2009 Aug 21

Country of Publication:

United States

Language:

English

Subject:

47 OTHER INSTRUMENTATION