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Fourier transform infrared spectroscopy of aqueous solutions using optical subtraction

Jensen, PS; Bak, J; Andersen, PE and Andersson-Engels, Stefan LU (2002) Conference on Optical Diagnostics and Sensing of Biological Fluids and Glucose and Cholesterol Monitoring II, SAN JOSE, CA, JAN 23-24, 2002 In OPTICAL DIAGNOSTICS AND SENSING OF BIOLOGICAL FLUIDS AND GLUCOSE AND CHOLESTEROL MONITORING II 4624. p.150-159
Abstract
For the analysis of small concentrations of organics in aqueous solutions, a novel add-on accessory for dual-beam / optical subtraction spectroscopy has been built for a commercial Fourier transform infrared spectrometer. A standard FT-IR instrument requires a sample measurement and a separate reference measurement, whereas the optical subtraction instrument directly measures the difference between sample and reference. This has a number of advantages. The time delay between the two measurements is eliminated, and the effective measurement time is improved by a factor of two. Moreover, the optical subtraction provides a large reduction in dynamic range of the measured signal, which prevents detector saturation, and enables effective use of... (More)
For the analysis of small concentrations of organics in aqueous solutions, a novel add-on accessory for dual-beam / optical subtraction spectroscopy has been built for a commercial Fourier transform infrared spectrometer. A standard FT-IR instrument requires a sample measurement and a separate reference measurement, whereas the optical subtraction instrument directly measures the difference between sample and reference. This has a number of advantages. The time delay between the two measurements is eliminated, and the effective measurement time is improved by a factor of two. Moreover, the optical subtraction provides a large reduction in dynamic range of the measured signal, which prevents detector saturation, and enables effective use of dynamic range of the analog to digital converter in the FT-IR spectrometer. This results in an increased signal to noise ratio, compared to the standard FT-IR instrument. By changing detector and light source the instrument may be used for both near- and mid.-infrared spectroscopy. The increased sensitivity and stability of the optical subtraction instrument compared to the standard instrument is demonstrated by transmission measurements of aqueous urea solutions in the combination band region 4000 to 5000cm(-1) (2000 to 2500nm). (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
in
OPTICAL DIAGNOSTICS AND SENSING OF BIOLOGICAL FLUIDS AND GLUCOSE AND CHOLESTEROL MONITORING II
editor
Priezzhev, AV; Cote, GL; and
volume
4624
pages
150 - 159
publisher
SPIE
conference name
Conference on Optical Diagnostics and Sensing of Biological Fluids and Glucose and Cholesterol Monitoring II, SAN JOSE, CA, JAN 23-24, 2002
external identifiers
  • scopus:0036060008
ISSN
0277-786X
1996-756X
ISBN
0-8194-4363-8
DOI
10.1117/12.468319
language
English
LU publication?
yes
id
8720b98a-f069-4e6a-b931-091491f0cf78 (old id 2260387)
date added to LUP
2012-01-26 23:33:26
date last changed
2017-12-10 03:56:16
@inproceedings{8720b98a-f069-4e6a-b931-091491f0cf78,
  abstract     = {For the analysis of small concentrations of organics in aqueous solutions, a novel add-on accessory for dual-beam / optical subtraction spectroscopy has been built for a commercial Fourier transform infrared spectrometer. A standard FT-IR instrument requires a sample measurement and a separate reference measurement, whereas the optical subtraction instrument directly measures the difference between sample and reference. This has a number of advantages. The time delay between the two measurements is eliminated, and the effective measurement time is improved by a factor of two. Moreover, the optical subtraction provides a large reduction in dynamic range of the measured signal, which prevents detector saturation, and enables effective use of dynamic range of the analog to digital converter in the FT-IR spectrometer. This results in an increased signal to noise ratio, compared to the standard FT-IR instrument. By changing detector and light source the instrument may be used for both near- and mid.-infrared spectroscopy. The increased sensitivity and stability of the optical subtraction instrument compared to the standard instrument is demonstrated by transmission measurements of aqueous urea solutions in the combination band region 4000 to 5000cm(-1) (2000 to 2500nm).},
  author       = {Jensen, PS and Bak, J and Andersen, PE and Andersson-Engels, Stefan},
  booktitle    = {OPTICAL DIAGNOSTICS AND SENSING OF BIOLOGICAL FLUIDS AND GLUCOSE AND CHOLESTEROL MONITORING II},
  editor       = {Priezzhev, AV and Cote, GL},
  isbn         = {0-8194-4363-8},
  issn         = {0277-786X},
  language     = {eng},
  pages        = {150--159},
  publisher    = {SPIE},
  title        = {Fourier transform infrared spectroscopy of aqueous solutions using optical subtraction},
  url          = {http://dx.doi.org/10.1117/12.468319},
  volume       = {4624},
  year         = {2002},
}