Sensor Array Chamber Design and Flow Simulation for Improved Gas Sensing Performance

In many applications in which multiple sensors are implemented to detect different gas volatiles, the design of the sensor array chamber is crucial. For example, the main atmospheric gas hazards are oxygen, methane, carbon monoxide, and hydrogen sulfide in confined spaces, the effective gas flow through the gas chamber housing the sensor array is crucial to be successful. At the moment, many works on such are not focused on the gas chamber design itself, such as the arrangement and the types of sensors. This research focuses on the structure’s geometry, material selection, type of flow, and sensor location. These parameters will determine the performance of the gas sensor array. Furthermore, the performance of complete experimental systems, including the testing chamber and the influence of the gas sensor array response effect such as ambient temperature and humidity must be improved. The research on various size and shape configurations of gas testing chambers is also included in this paper. Solid Work software's 3D-CFD flow express simulation was used to analyze the best sample flow within the sensor chamber with the main atmospheric gas flow. Simulated versions of two types of chamber series and parallel were evaluated to determine the ideal design. The pressure, velocity, and Reynolds (Re) number produced during the simulation were used as the basis for the research. The experimental results show that the series arrangement of the sensors results in a lower Re number and performs better than parallel arrangement.