公开(公告)号：US09823220B2

公开(公告)日：2017-11-21

申请号：US13398095

申请日：2012-02-16

申请人： Kenji Kato ,  Kouji Shiotani ,  Takeshi Kawai ,  Satoshi Teramoto

发明人： Kenji Kato ,  Kouji Shiotani ,  Takeshi Kawai ,  Satoshi Teramoto

IPC分类号： G01N27/419

CPC分类号： G01N27/419

摘要： An apparatus and method for individually detecting NO and NO2 concentrations as NOX components of an object gas. An NO concentration corresponding value is obtained from a first detection element not having a reduction section. An NO concentration corresponding value is obtained from a second detection element having a reduction section, and having an NO2/NO sensitivity ratio greater than that of the first detection element. The difference ΔC between the NO concentration corresponding values of the two detection elements is obtained, and divided by the difference ΔS between the NO2/NO sensitivity ratios of the two detection elements, whereby an NO2 concentration corresponding value is obtained. A value obtained by multiplying the NO2 concentration corresponding value by the NO2/NO sensitivity ratio of the second detection element is subtracted from the NO concentration corresponding value of the second detection element, whereby an NO concentration corresponding value is obtained.