# US 10,309,923 B2 · Gas sensor device

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- Number: US 10,309,923 B2
- Document ID: US10309923B2
- Status: Granted
- Kind: B2
- Application number: 15/325,206
- Filed: 2015-07-08
- Published: 2017-07-06
- Granted: 2019-06-04
- Earliest claimed: 2014-07-10
- Assignees: Denso Corporation
- Applicants: Denso Corporation
- Inventors: Yuusuke Toudou; Takehito Kimata; Mitsunobu Nakatou
- Web page: https://patentgrep.com/patent/US10309923B2

## CPC

- G01N 27/41: Oxygen pumping cells
- G01N 27/4071: {using sensor elements of laminated structure}
- G01N 27/4074: {for detection of gases other than oxygen}
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)

## Abstract

A gas sensor device is equipped with the sensor cell, the pump cell, the inner void space, and the gas inlet. The sensor cell is created by a portion of the solid electrolyte body and a pair of sensor electrodes disposed on the solid electrolyte body. The pump cell is created by a portion of the solid electrolyte body and a pair of pump electrodes disposed on the solid electrolyte body. The inner void space faces the sensor electrode and the pump electrode. If a dimension of said gas inlet in a direction in which the measurement gas flows in the gas inlet is defined as L1, a sectional area of the gas inlet taken perpendicular to the direction of flow of the measurement gas in the gas inlet is defined as S1, a distance between the gas inlet and the sensor cell is defined as L2, and a sectional area of the inner void space taken perpendicular to a direction in which the pump cell and the sensor cell are aligned with each other is defined as S2, a relation of 1000≤(L1/S1)×(L2/S2)≤5000 is met.

## Claims

### Claim 1

A gas sensor device comprising:
a sensor cell which is made up of a first portion of an oxygen ion conductive solid electrolyte body and a pair of sensor electrodes disposed on the solid electrolyte body, the sensor cell working to measure a concentration of a given gas component in a measurement gas;
a pump cell which is made up of a second portion of the solid electrolyte body and a pair of pump electrodes disposed on the solid electrolyte body, the pump cell working to regulate a concentration of oxygen in the measurement gas;
an inner void space which faces one of the sensor electrodes and one of the pump electrodes and into which the measurement gas is introduced; and
a diffusion resistor through which the measurement gas is introduced into said inner void space and which is shaped to provide a given diffusion resistance to the measurement gas introduced into said inner void space,
wherein if a dimension of said diffusion resistor in a direction in which the measurement gas flows in said diffusion resistor is defined as L1, a sectional area of said diffusion resistor taken perpendicular to the direction of flow of the measurement gas in said diffusion resistor is defined as S1, a distance between said diffusion resistor and said sensor cell is defined as L2, and a sectional area of said inner void space taken perpendicular to a direction in which said pump cell and said sensor cell are aligned with each other is defined as S2, a relation of 1000≤(L1/S1)×(L2/S2)≤5000 is met, and the product of (L1/S1)×(L2/S2) has the unit of 1/length unit2,
in that the above diffusion resistor is made of a porous body, and said sectional area S1 is a value derived by a product of a sectional area of the porous body taken perpendicular to the direction of flow of the measurement gas and a porosity of the porous body, and
in that said inner void space is shaped to have a configuration uniform from a region where the inner void space faces the pump electrode to a region where the inner void space faces the sensor electrode;
wherein a direction in which said sensor cell and a monitor cell are aligned with each other is perpendicular to a direction in which said pump cell and said sensor cell are aligned with each other.

### Claim 2 (depends on 1)

A gas sensor device as set forth in claim 1, wherein a relation of 1250≤(L1/S1)×(L2/S2)≤2500 is met.

### Claim 3 (depends on 1)

A gas sensor device as set forth in claim 1, wherein the monitor cell is made up of a portion of said solid electrolyte body and a pair of monitor electrodes disposed on the solid electrolyte body and works to measure a concentration of oxygen in the measurement gas.