DOE Patents title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Multiplex coherent raman spectroscopy detector and method

Abstract

A multiplex coherent Raman spectrometer (10) and spectroscopy method rapidly detects and identifies individual components of a chemical mixture separated by a separation technique, such as gas chromatography. The spectrometer (10) and method accurately identify a variety of compounds because they produce the entire gas phase vibrational Raman spectrum of the unknown gas. This is accomplished by tilting a Raman cell (20) to produce a high-intensity, backward-stimulated, coherent Raman beam of 683 nm, which drives a degenerate optical parametric oscillator (28) to produce a broadband beam of 1100-1700 nm covering a range of more than 3000 wavenumber. This broadband beam is combined with a narrowband beam of 532 nm having a bandwidth of 0.003 wavenumbers and focused into a heated windowless cell (38) that receives gases separated by a gas chromatograph (40). The Raman radiation scattered from these gases is filtered and sent to a monochromator (50) with multichannel detection.

Inventors:
; ; ;
Issue Date:
Research Org.:
Spelman College, Atlanta, GA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1174888
Patent Number(s):
6747735
Application Number:
10/450,403
Assignee:
Spelman College
Patent Classifications (CPCs):
G - PHYSICS G01 - MEASURING G01J - MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED, VISIBLE OR ULTRA-VIOLET LIGHT
G - PHYSICS G01 - MEASURING G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
DOE Contract Number:  
FG01-96EW13219
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY

Citation Formats

Chen, Peter, Joyner, Candace C., Patrick, Sheena T., and Guyer, Dean R. Multiplex coherent raman spectroscopy detector and method. United States: N. p., 2004. Web.
Chen, Peter, Joyner, Candace C., Patrick, Sheena T., & Guyer, Dean R. Multiplex coherent raman spectroscopy detector and method. United States.
Chen, Peter, Joyner, Candace C., Patrick, Sheena T., and Guyer, Dean R. Tue . "Multiplex coherent raman spectroscopy detector and method". United States. https://www.osti.gov/servlets/purl/1174888.
@article{osti_1174888,
title = {Multiplex coherent raman spectroscopy detector and method},
author = {Chen, Peter and Joyner, Candace C. and Patrick, Sheena T. and Guyer, Dean R.},
abstractNote = {A multiplex coherent Raman spectrometer (10) and spectroscopy method rapidly detects and identifies individual components of a chemical mixture separated by a separation technique, such as gas chromatography. The spectrometer (10) and method accurately identify a variety of compounds because they produce the entire gas phase vibrational Raman spectrum of the unknown gas. This is accomplished by tilting a Raman cell (20) to produce a high-intensity, backward-stimulated, coherent Raman beam of 683 nm, which drives a degenerate optical parametric oscillator (28) to produce a broadband beam of 1100-1700 nm covering a range of more than 3000 wavenumber. This broadband beam is combined with a narrowband beam of 532 nm having a bandwidth of 0.003 wavenumbers and focused into a heated windowless cell (38) that receives gases separated by a gas chromatograph (40). The Raman radiation scattered from these gases is filtered and sent to a monochromator (50) with multichannel detection.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2004},
month = {6}
}