25 April 2005 Optoacoustic detection of different doping substances commonly used by athletes with an optical parametric generation laser source
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Abstract
In this paper, we present first results of a spectral characterisation of doping substances using a resonant optoacoustic cell and a Nd:YAG laser pumped optical parametric generation (OPG) laser source in the mid-infrared wavelength range between 3.0 and 4.0 μm with periodically poled LiNbO3 as nonlinear medium for the frequency conversion. Single spectra covering a wavelength range of about 220 nm can be conducted within less than 2 hours (3s averaging time, 7s between consecutive data points, about 0.3nm step-width). Despite the large linewidth of the OPG source of 240 GHz (8 cm-1), the laser spectrometer is well suited for the spectral analysis of these large organic molecules as they exhibit structured continuum absorption over a wide spectral range rather than isolated absorption peaks. We present measured spectra of ephedrine, alprenolol, ethacrynic acid, etc. and discuss the potential of laser-based detection of doping substances both as a supplement to existing methods and in view of a fast in situ screening technique at sporting events.
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Cornelia Fischer, Richard Bartlome, Markus W. Sigrist, "Optoacoustic detection of different doping substances commonly used by athletes with an optical parametric generation laser source", Proc. SPIE 5697, Photons Plus Ultrasound: Imaging and Sensing 2005: The Sixth Conference on Biomedical Thermoacoustics, Optoacoustics, and Acousto-optics, (25 April 2005); doi: 10.1117/12.588277; https://doi.org/10.1117/12.588277
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KEYWORDS
Photoacoustic spectroscopy

Doping

Absorption

Laser sources

Laser spectroscopy

Molecules

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