Title:
GAS SENSOR
Document Type and Number:
WIPO Patent Application WO/2024/105868
Kind Code:
A1
Abstract:
[Problem] To reduce the difference in thermal history between a thermistor forming a detection element and a thermistor forming a reference element. [Solution] A gas sensor 1 comprises: a detection circuit 10 including thermistors Rd1, Rd2; heater resistors MH1, MH2 that respectively heat the thermistors Rd1, Rd2; and a control circuit 20 that controls the connection relationship in the detection circuit 10 and the heating temperature of the heater resistors MH1, MH2. In a period of time T1, the control circuit 20 heats the heater resistors MH1, MH2 to 150°C and 300°C, respectively, and connects the thermistors Rd1, Rd2 in series. In a period of time T2, the control circuit 20 heats the heater resistors MH1, MH2 to 300°C and 150°C, respectively, and changes the connection relationship so that the amount of electric current flowing through the thermistors Rd1, Rd2 is different. This reduces the difference in self-heating amount of the thermistors Rd1, Rd2 in the period of time T2.
Inventors:
TANABE KEI (JP)
Application Number:
PCT/JP2022/042803
Publication Date:
May 23, 2024
Filing Date:
November 18, 2022
Export Citation:
Assignee:
TDK CORP (JP)
International Classes:
G01N27/18
Domestic Patent References:
| WO2018135100A1 | 2018-07-26 | |||
| WO2020129341A1 | 2020-06-25 | |||
| WO2020031517A1 | 2020-02-13 |
Foreign References:
| JP2021099220A | 2021-07-01 |
Attorney, Agent or Firm:
WASHIZU Mitsuhiro et al. (JP)
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