Medical Trace Gas Detection by Means of Mid-Infrared Cavity Leak-Out Spectroscopy

  • Hannes Dahnke
  • Sandra Stry
  • Golo von Basum


Ambient air and the human breath both contain many different volatile organic and inorganic compounds. Most of them are present in very low concentrations. The analysis of these trace gases leads in case of ambient air to a better understanding of the atmospheric chemistry and in the case of breath tests to a deeper knowledge of the physiological processes in the human body. Amongst other sources these compounds are produced in the human organism and find their way via the blood through the lungs into the human breath. Most of the volume fractions of these trace gases are on the order of some ppb (parts per billion: 1:109) down to several ppt (parts per trillion: 1:1012). This shows the need for ultra sensitive analytical methods for the in-vivo monitoring of human breath, which helps to understand various physiological and pathophysiological processes in the human organism.


Master Oscillator Power Amplifier Human Breath Cigarette Brand Pole Lithium Niobate Cavity Ringdown Spectroscopy 
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© Springer-Verlag Berlin Heidelberg 2004

Authors and Affiliations

  • Hannes Dahnke
  • Sandra Stry
  • Golo von Basum

There are no affiliations available

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