Title:
SENSOR ELEMENT AND GAS SENSOR
Document Type and Number:
Japanese Patent JP2018169328
Kind Code:
A
Abstract:
To suppress a reduction in the accuracy of detecting a specific gas concentration.SOLUTION: A sensor element comprises: a laminate having a plurality of laminated oxygen ion conductive solid electrolyte layers and provided inside with a measurement object gas circulation unit in which a measurement object gas is introduced and circulated; a measurement electrode disposed on the inner circumferential surface of the measurement object gas circulation unit; a measurement object gas-side electrode disposed in a portion of the laminate exposed to the measurement object gas; a reference electrode 42 disposed inside the laminate; and a porous air introduction layer 48 in which a reference gas serving as reference for detection of a specific gas concentration of the measurement object gas and circulated to the reference electrode 42. The air introduction layer 48 is divided into a rear-side portion 48a and an inlet-side portion 48b at a prescribed partitioning position as boundary from an inlet part 48c inward toward 50-95% of the overall length of the air introduction layer 48, the diffusion resistance Rb of the inlet-side portion 48b being larger than the diffusion resistance Ra of the rear-side portion 48a where the reference electrode 42 is contained.SELECTED DRAWING: Figure 3
Inventors:
WATANABE YUSUKE
Application Number:
JP2017067779A
Publication Date:
November 01, 2018
Filing Date:
March 30, 2017
Export Citation:
Assignee:
NGK INSULATORS LTD
International Classes:
G01N27/416
Domestic Patent References:
| JP2015200643A | 2015-11-12 | |||
| JP2005525552A | 2005-08-25 | |||
| JP2004226171A | 2004-08-12 | |||
| JP2004151017A | 2004-05-27 | |||
| JP2010122187A | 2010-06-03 | |||
| JP2012211863A | 2012-11-01 | |||
| JP2016028226A | 2016-02-25 |
Attorney, Agent or Firm:
Aitec International Patent Office