Sensor Assemblies For Analyzing NO and NO2 Concentrations In An Emission Gas And Methods For Fabricating The Same

A method for fabricating a sensor assembly for analyzing concentrations of NO2 and NO in a gas, the method comprising the steps of:

• fabricating a first sensor configured to detect a concentration of NOx in the gas and to provide a first signal associated with the concentration of NOx in the gas, wherein NOx represents a combination of NO2 and NO;
• fabricating a second sensor configured to detect a concentration of one of NO2 and NO in the gas and to provide a second signal associated with the concentration of the one of NO2 and NO in the gas;
• and
• disposing the first and the second sensor so that they are in a stationary position relative to each other.

A sensor assembly for analyzing concentrations of NO2 and NO in an emission gas, the sensor assembly comprising:

• a first sensor having a first barium tungstate film, wherein the first sensor is configured to detect a concentration of NOx in the emission gas and to provide a first signal indicating the concentration of NOx, wherein NOx represents a combination of NO2 and NO;
• and
• a second sensor having a second barium tungstate film, wherein the second sensor is configured to detect a concentration of NO2 in the emission gas and to provide a second signal indicating the concentration of NO2;
• and
• a calculating means configured to receive the first signal from the first sensor and the second signal from the second sensor and subtract the second signal from the first signal to produce a third signal that is associated with the concentration of NO in the emission gas.