Title:
センサ素子及びガスセンサ
Document Type and Number:
Japanese Patent JP7349944
Kind Code:
B2
Abstract:
To measure correctly, density of a specific oxide gas, regardless of an atmosphere of a gas to be measured.SOLUTION: A sensor element 101 comprises: a main pump cell 21 comprising an external pump electrode 23 including Pt on a part exposed to an exhaust gas of an element body 101a, and adjusting oxygen density of a first internal dead space 20; and a porous protective layer 91 for covering a tip part including a gas introduction hole 10 and the external pump electrode 23 on an external plane of the electrode body 101a. A first gas circulation path is a path reaching the gas introduction hole 10 from a position facing the gas introduction hole 10 on a surface of the porous protective layer 91, at a shortest distance. A second gas circulation path is a path reaching a near side of the gas introduction hole 10 through the external pump electrode 23 from a position facing the external pump electrode 23 out of the surface of the porous protective layer 91 at a shortest distance. A gas circulation inhibition part 92 is provided at a region for blocking the second gas circulation path, and a ratio of the first gas circulation path to a porosity of the gas circulation inhibition part 92 is 1.03 or greater.SELECTED DRAWING: Figure 2
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Inventors:
Daichi Ichikawa
Application Number:
JP2020049028A
Publication Date:
September 25, 2023
Filing Date:
March 19, 2020
Export Citation:
Assignee:
Nippon Insulator Co., Ltd.
International Classes:
G01N27/409; G01N27/416
Domestic Patent References:
| JP2015114970A | ||||
| JP2019138641A | ||||
| JP2019082418A | ||||
| JP2020020742A | ||||
| JP2016065852A |
Attorney, Agent or Firm:
Patent Attorney Corporation ITEC International Patent Office
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