The presented thesis, deals with different measuring principles of carbon dioxide concentration measuring, on which current sensors are based. The option of their calibration process is also described. Only the most important, most commonly used sensors and their measuring principles will be described, because a description of all known principles would exceed the scope of the thesis.
Among the most commonly used sensors, we can find sensors which are based on optical methods since the carbon dioxide is chemically very inert gas, but has a very good absorption of a certain part of the infrared spectrum. Because the sensors can be in contact with corrosive gases and other environmental impacts, that could affect the measurement, we need to choose the appropriate sensor. Knowledge of its measuring principle can help us chose the right one. Knowing the measuring principle of the used sensor, it could also help us to approximately indicate, how often it will be necessary to carry out the calibration of the sensor (if needed) and its maintenance costs. This information is usually mentioned in the documentation of the sensor or submitted by the manufacturer.