Principles and Means of Composing Concentration Detection of Mixture Gases with Metal Oxide Gas Sensors

It’s difficult to detect composing concentration of gases mixture with metal oxide gas sensor because of cross responses of various gases.Based on the typical sensitivity characteristic, i.e. sensitivity depend on gas concentration submitting logarithmic linear property, same type of metal oxide gas sensor has different sensitivity characteristic for different gases, and different type of metal oxide gas sensor has different sensitivity characteristic for same gas. The principles and means of linear formula for detection of composing concentration of mixture gases using various metal oxide gas sensors has been presented, and introduced measurement of single gas concentration of unknown mixture gases. Result shows that logarithm of composing concentration of mixture gases is equal multiply n×n exponent matrix by n×1 function matrix of output of sensors array and coefficient in the concentration range of sensor effective measurement. Experiment shows the detect error of composing concentration of mixture gases less than 7%。