This paper explains the use of Non-Dispersive InfraRed (NDIR) sensor that
is built into the complex system for the air quality monitoring. It is known
that CO2 is an important
indicator of the current state of the environment, especially in urban
areas and indoor air quality.
Latest CO2 NDIR gas sensors are low cost, low power consumption, miniature and
have a long lifetime so that the increasingly built into new systems for
measuring environmental parameters. By using commercially available detectors
and advanced knowledge of the design of electronic circuits, measuring the
concentration of CO2 is explained in detail in this paper.
In this paper NDIR sensors are discussed, targeting only commercially
available solutions for measuring CO2 concentration. As a representative of
NDIR sensors, Alphasense IRC-A1 sensor is selected. This sensor will be used as
an example to explain the principles of operation of NDIR sensors. It will also
be explained electronic circuit for processing signals from the sensor and the
methods to calculate the final concentration of CO2 from collected data.
Finally, an example of measurement in field conditions with a detailed analysis
is given.
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