Gas sensor and method for detecting a gas
AssigneeRobert Bosch GmbH
InventorMartin Schreivogel
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Abstract
A gas sensor combines two separate measurement methods in one shared structure. By way of the gas sensor, a qualitative or quantitative measurement of gases based on measurement of a variation in electrical conductivity, and a measurement of a change in work function based on a variation in the capacitance or impedance between two electrodes, can be carried out.
Claims11
1-10. (canceled)
A gas sensor, comprising:
- an electrically conductive back electrode;
- a front electrode having two electrode elements electrically separated from one another;
- a dielectric layer that is disposed between the back electrode and the front electrode;
- and
- a gas-sensitive layer that is disposed on a side of the dielectric layer on which the front electrode is disposed.
A method for detecting a gas using a gas sensor, the gas sensor including an electrically conductive back electrode, a front electrode having two electrode elements electrically separated from one another, a dielectric layer that is disposed between the back electrode and the front electrode, and a gas-sensitive layer that is disposed on a side of the dielectric layer on which the front electrode is disposed, the method comprising:
- ascertaining an electrical conductivity between the two electrode elements of the front electrode;
- ascertaining an impedance and/or a capacitance between the back electrode and the two electrode elements of the front electrode;
- and
- identifying a gas based on a comparison of the ascertained electrical conductivity between the two electrode elements of the front electrode, and of the ascertained impedance and/or capacitance between the back electrode and the two electrode elements of the front electrode, with predetermined values.
Dependencies are inferred from the claim text.