| 摘要 |
The present invention relates to a NOx sensor and a calculating method of total NOx concentration using the same, and more particularly, to a NOx sensor which has improved sensitivity to NO and NO2 and simply calculates NO, NO2 and total NOx concentration, and a calculating method of total NOx concentration using the same. The NOx sensor of the present invention comprises an oxygen ion conductive solid electrolyte 10; an oxide sensing electrode 20 formed at the oxygen ion conductive solid electrolyte 10; a noble metal electrode 30; and a lead line 40 connected to each of the oxygen ion conductive solid electrolyte 10 or the oxide sensing electrode 20 or the noble metal electrode 30, wherein the oxygen ion conductive solid electrolyte 10 and the oxide sensing electrode 20 form at least two interfaces. Further, the calculating method of total NOx concentration of the present invention comprises the steps of a) measuring voltages or currents of each of two or more NOx sensors 100 as described above; b) substituting the measured voltages or currents into a series of NOx concentration calculating formulars of each of the NOx sensors 100 so as to calculate NO and NO2 concentrations separately; and c) adding the NO and NO2 concentrations so as to calculate the total NOx concentration. According to the NOx sensor and the calculating method of measuring total NOx concentration using the same, it is possible to prevent the deterioration of the sensitivity even in an atmosphere that the NO accounts for a major percent, thereby increasing the measurement precision. And by using a simple method in which the electromotive force measured in two or more sensors or two or more interfaces is substituted into the NOx concentration calculating formular, it is possible to facilely calculate the NO, NO2 and NOx concentration.
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