Title:
GAS SENSOR
Document Type and Number:
WIPO Patent Application WO/2023/162582
Kind Code:
A1
Abstract:
This gas sensor 1 comprises a first detection element 10 which is exposed to a reference atmosphere obtained by removing hydrogen gas from a target atmosphere, and a second detection element 20 which is exposed to the target atmosphere. The first detection element 10 and the second detection element 20, for each of which a resistance value changes due to a change in the temperature of the respective element, are connected in series so as to form one side of a bridge circuit 41. The gas sensor 1 comprises: an amplification circuit 42 that outputs an amplified voltage Vd2 on the basis of an intermediate voltage between the first detection element 10 and the second detection element 20 when a prescribed voltage has been applied to the bridge circuit 41; a non-amplification circuit 43 that outputs the intermediate voltage, as is, as a non-amplified voltage Vd1; and a control unit 30 into which the amplified voltage Vd2 and the non-amplified voltage Vd1 are input. The control unit calculates a hydrogen gas concentration Dc (the concentration of the gas to be detected) on the basis of the amplified voltage Vd2 which was input, and determines a failure of the gas sensor 1 on the basis of at least the non-amplified voltage Vd1.
Inventors:
YAMASHITA MASAHIRO (JP)
KITANOYA SHOJI (JP)
KITANOYA SHOJI (JP)
Application Number:
PCT/JP2023/002841
Publication Date:
August 31, 2023
Filing Date:
January 30, 2023
Export Citation:
Assignee:
NITERRA CO LTD (JP)
International Classes:
G01N27/18
Foreign References:
| JP2019053028A | 2019-04-04 | |||
| JP2007139667A | 2007-06-07 | |||
| JP2009236711A | 2009-10-15 | |||
| JP2016200456A | 2016-12-01 | |||
| US20210181135A1 | 2021-06-17 |
Attorney, Agent or Firm:
AKATSUKI UNION PATENT FIRM (JP)
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