Design and testing of signal conditioning and processing circuits for environmental gases

The present work is carried out to model and test a signal conditioning and processing circuit for three different sensors, which detect environment gases. The importance of the gases measured is discussed and the sensors used for detection are discussed in detail.; A basic circuit was initially designed which serves as the primary circuit for the three sensors used. The design was later developed with appropriate modifications and adding extra circuit in order to fit each sensor chosen. The responses of the sensors to the target gases obtained from the experiments are first analyzed and then the results are discussed. A future model which would accommodate six different sensors is also proposed in this work. A final conclusion is given from the results obtained from the tests performed.