Title:
ガスセンサ
Document Type and Number:
Japanese Patent JP7351228
Kind Code:
B2
Abstract:
To calibrate a sensitivity error of a temperature-sensitive resistance element due to aging in a gas sensor of the type that heats the temperature-sensitive resistance element during measurement.SOLUTION: A gas sensor 1 comprises: a sensor unit S1 including a thermistor Rd1 and a heater resistor MH1 to heat the thermistor; and a signal processing circuit 20 for calculating concentration of gas to be detected based on a detection voltage Vg output from the sensor unit S1. The signal processing circuit 20 calibrates sensitivity information used to calculate the concentration of the gas to be detected based on a level of the detection voltage Vg obtained when the thermistor Rd1 is heated to a first temperature and a level of the detection voltage Vg obtained when the thermistor Rd1 is heated to a second temperature. This makes it possible to calculate a more accurate gas concentration even when the sensitivity of the thermistor Rd1 changes over time.SELECTED DRAWING: Figure 1
Inventors:
Yutaka Matsuo
Yoshio Kaita
Yoshio Kaita
Application Number:
JP2020008320A
Publication Date:
September 27, 2023
Filing Date:
January 22, 2020
Export Citation:
Assignee:
TDK Corporation
International Classes:
G01N27/18; G01N27/16
Domestic Patent References:
| JP2017009472A | ||||
| JP8184576A | ||||
| JP2017156293A |
Foreign References:
| US20030037590 |
Attorney, Agent or Firm:
Mitsuhiro Washito
Ogata Japanese
Ogata Japanese