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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 47, Iss. 12 — Apr. 20, 2008
  • pp: 1956–1962

Mid-infrared spectroscopic investigation of methylamines by a continuous-wave difference-frequency-generation-based system

Dilyan Marinov, Julien Rey, and Markus W. Sigrist  »View Author Affiliations


Applied Optics, Vol. 47, Issue 12, pp. 1956-1962 (2008)
http://dx.doi.org/10.1364/AO.47.001956


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Abstract

A laser spectroscopic system based on a cw difference-frequency generation source with a ratiometric multipass absorption detection scheme was employed for high-resolution spectroscopic investigation of gas-phase monomethylamine (MMA), dimethylamine (DMA), and trimethylamine (TMA). Possible application of the system as a noninvasive human breath analyzer for renal and liver diseases is targeted. The system operates in the fundamental C H stretch absorption region around 2740 2860 cm 1 . A detection sensitivity of 2 × 10 6 cm 1 Hz 1 / 2 (for signal-to-noise ratio SNR = 1 ) is achieved, corresponding to detection limits of 900 ppb (parts in 10 9 ) for MMA, 450 ppb for DMA, and 120 ppb for TMA in mixtures containing H 2 O and CO 2 with concentrations of up to those present in human breath (2% and 5%, respectively). Future developments are discussed to further improve these detection limits that are currently still about 2 orders of magnitude higher than required for direct methylamine monitoring in human breath.

© 2008 Optical Society of America

OCIS Codes
(140.3600) Lasers and laser optics : Lasers, tunable
(170.4580) Medical optics and biotechnology : Optical diagnostics for medicine
(300.6360) Spectroscopy : Spectroscopy, laser

ToC Category:
Spectroscopy

History
Original Manuscript: January 15, 2008
Revised Manuscript: March 20, 2008
Manuscript Accepted: March 21, 2008
Published: April 11, 2008

Virtual Issues
Vol. 3, Iss. 5 Virtual Journal for Biomedical Optics

Citation
Dilyan Marinov, Julien Rey, and Markus W. Sigrist, "Mid-infrared spectroscopic investigation of methylamines by a continuous-wave difference-frequency-generation-based system," Appl. Opt. 47, 1956-1962 (2008)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-47-12-1956

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