Variance Analysis of Signals from Four Electrode Electrochemical Sensors

This paper presents the signal accuracy analysis of a device for air quality monitoring that is equipped with electrochemical sensors with four electrodes from Alphasense Ltd. The device has been evaluated under several tests to see what is the hardware response without any sensors, how the variance of the signals differs with the addition of other sensors, not only electrochemical ones but also non-inverted infrared and light scattering ones, and also in the context of adding communication components for Orange LTE-M network. The purpose of the study is to create a complete air quality monitoring system and to prepare it for future calibration procedures.