公开(公告)号：US20160061768A1

公开(公告)日：2016-03-03

申请号：US14823217

申请日：2015-08-11

Applicant: NGK INSULATORS, LTD.

Inventor： Osamu NAKASONE ,  Takayuki SAKURAI ,  Satoshi NISHIKAWA ,  Noriko HIRATA ,  Yuki NAKAYAMA

IPC: G01N27/407 ,  G01N27/41 ,  G01N27/30

CPC classification number: G01N27/4074 ,  G01N27/301 ,  G01N27/4072 ,  G01N27/41 ,  G01N27/419

Abstract: Provided is a gas sensor having excellent detection sensitivity and responsiveness. In a sensor element, 3.5≦D2/D1≦6 is satisfied, where D1 is a value of a diffusion resistance of a measurement gas via a main gas distribution part extending from an outside edge position of a first gas inlet to the second internal space, and D2 is a value of a diffusion resistance of a measurement gas flowing via a second gas inlet that causes the outside and the second internal space to communicate with each other. The concentration of a predetermined gas component contained in the measurement gas through the second gas inlet is determined on the basis of a potential difference between the sensing electrode and a reference electrode, while pumping oxygen in or out for the measurement gas via the main gas distribution part such that the oxygen concentration of the second internal space is maintained at 1 vol % or more.

Abstract translation: 提供了具有优异的检测灵敏度和响应性的气体传感器。 在传感器元件中，满足3.5＆nlE; D2 / D1＆nlE; 6，其中D1是经由主气体分配部分从第一气体入口的外边缘位置延伸到第二内部的测量气体的扩散电阻的值 空间和D2是通过使第二内部空间彼此连通的第二气体入口流动的测量气体的扩散阻力的值。 基于感测电极和参考电极之间的电位差来确定测量气体中包含的通过第二气体入口的预定气体组分的浓度，同时通过主气体分布泵送测量气体中的氧气 使得第二内部空间的氧浓度保持在1体积％以上。

公开(公告)号：US20140332378A1

公开(公告)日：2014-11-13

申请号：US14274994

申请日：2014-05-12

Applicant: NGK Insulators, Ltd.

Inventor： Osamu NAKASONE ,  Satoshi NISHIKAWA ,  Shotarou NIIZUMA ,  Noriko HIRATA ,  Yuki NAKAYAMA

IPC: G01N27/41

CPC classification number: G01N27/41 ,  G01N27/4074 ,  G01N27/419 ,  G01N33/0047

Abstract: Provided is a gas sensor capable of accurately obtaining a hydrocarbon gas concentration even if a measurement gas contains water vapor. A main pumping cell adjusts an oxygen partial pressure of a first internal space such that a hydrocarbon gas in a measurement gas is not substantially burned in the first internal space. An auxiliary pumping cell adjusts an oxygen partial pressure of a second internal space such that inflammable gas components except for hydrocarbon are selectively burned. Then, a measuring pumping cell supplies oxygen to a surface of a measuring electrode. As a result, hydrocarbon existing in the measurement gas being in contact with the measuring electrode is all burned on the surface of the measuring electrode and, based on the magnitude of a current flowing between the measuring electrode and a main pumping electrode at that time, identifies a concentration of a hydrocarbon gas component existing in the measurement gas.

Abstract translation: 提供了即使测量气体含有水蒸气也能够精确地获得烃气体浓度的气体传感器。 主泵送单元调节第一内部空间的氧分压，使得测量气体中的烃气体在第一内部空间中基本上不被燃烧。 辅助泵送单元调节第二内部空间的氧分压，使得除了烃之外的可燃气体成分被选择性地燃烧。 然后，测量泵送单元向测量电极的表面供氧。 结果，与测量电极接触的测量气体中存在的烃全部在测量电极的表面上燃烧，并且基于此时在测量电极和主泵送电极之间流动的电流的大小， 识别存在于测量气体中的烃气体组分的浓度。

公开(公告)号：US20160033447A1

公开(公告)日：2016-02-04

申请号：US14800171

申请日：2015-07-15

Applicant: NGK INSULATORS, LTD.

Inventor： Osamu NAKASONE ,  Takayuki SAKURAI ,  Satoshi NISHIKAWA ,  Shotaro NIIZUMA ,  Noriko HIRATA ,  Yuki NAKAYAMA

IPC: G01N27/407 ,  H01B1/02 ,  G01N27/30

CPC classification number: G01N27/4071 ,  G01N27/301 ,  G01N27/4075 ,  G01N27/4076 ,  H01B1/02

Abstract: A sensing electrode for sensing a predetermined gas component of a measurement gas, which is provided in a mixed-potential gas sensor that measures the concentration of the predetermined gas, component, is formed of a cermet containing a noble metal and an oxygen-ion conductive solid electrolyte. The noble metal comprisesPt and Au. An Au abundance ratio, which is an area ratio of a portion covered with Au to a portion at which Pt is exposed in a surface of noble metal particles forming the sensing electrode, is 0.3 or more.

Abstract translation: 用于感测测量气体的预定气体成分的感测电极由测量气体成分浓度的混合电位气体传感器组成，由含有贵金属和氧离子导电的金属陶瓷形成 固体电解质。 贵金属包括Pt和Au。 作为Au覆盖的部分的面积比与在Pt形成感应电极的贵金属粒子的表面露出的部分的面积比为0.3以上的Au丰度比。