CO2 concentration sensor
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United States of America Patent
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Feb 21, 2017
Grant Date -
Nov 26, 2015
app pub date -
Dec 30, 2013
filing date -
Jan 2, 2013
priority date (Note) -
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Abstract
Device for measuring the concentration of a predetermined gas, in particular CO2, comprising a cavity, a light source emitting light rays within a basic spectral range including visible and infrared, a detector configured to receive a portion of the light rays within a first predefined spectral range corresponding to high absorption of the predetermined gas, a photodiode configured to receive a portion of the light rays within a second predefined spectral range corresponding to low absorption of the predetermined gas, a control unit configured to calculate the concentration of the predetermined gas by comparing the radiant power received by the detector to the radiant power received by the photodiode.
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