Apparatus for measuring a level of a specific gas in exhaled breath
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United States of America Patent
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Jun 6, 2017
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N/A
app pub date -
Oct 29, 2010
filing date -
Nov 3, 2009
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Abstract
There is provided an apparatus for measuring levels of a specified gas in exhaled breath, the apparatus comprising a photoacoustic sensor for providing a measurement representative of the level of the specified gas in the exhaled air, wherein the photoacoustic sensor comprises a light source that is modulated at a first frequency; a sound speed measurement module for measuring the sound speed of the exhaled breath, wherein the sound speed measurement module operates either at a second frequency that is substantially different to the first frequency or in a pulsed mode; wherein the first frequency of the modulated light source is adjusted during exhalation in accordance with the measured speed of sound of the exhaled breath.
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