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公开(公告)号：US20240151699A1
公开(公告)日：2024-05-09
申请号：US18486297
申请日：2023-10-13
Applicant: TDK Corporation
Inventor： Yoshio KAITA , Hiroshi KOBAYASHI , Yasuhiro INUI
CPC classification number: G01N33/004 , G01K7/24 , G01N27/124 , G01N27/18
Abstract: Disclosed herein is a gas sensor that includes a gas sensor part including first and second thermistors connected in series, a temperature sensor part configured to generate a temperature detection signal, a variable resistor connected in parallel to the first thermistor, and a control circuit configured to change a resistance value of the variable resistor based on the temperature detection signal.
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公开(公告)号：US20190353607A1
公开(公告)日：2019-11-21
申请号：US16479338
申请日：2017-11-09
Applicant: TDK Corporation
Inventor： Yoshio KAITA
Abstract: A gas sensor includes a first sensor part that can detect the concentration of the mixture of first gas and second gas, a second sensor part having higher detection sensitivity with respect to the second gas than with respect to the first gas, and a signal processing circuit that subtracts the concentration of the second gas detected by the second sensor part from the mixture concentration detected by the first sensor part to derive the concentration of the first gas. The concentration of the second gas detected by the second sensor part is subtracted from the concentration of the mixture concentration detected by the first sensor part, so that it is possible to cancel the influence of the second gas which is miscellaneous gas to thereby work out a correct value of concentration of the first gas to be detected.
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Patent Agency Ranking
公开(公告)号：US20240133834A1
公开(公告)日：2024-04-25
申请号：US18482431
申请日：2023-10-05
Applicant: TDK Corporation
Inventor： Yoshio KAITA , Yasuhiro INUI , Yutaka MATSUO
CPC classification number: G01N27/122 , G01N27/18 , G01N33/004
Abstract: Disclosed herein is a gas sensor that includes a sensor part configured to generate a gas detection signal in accordance with a concentration of a gas to be measured, and a control circuit configured to generate an output signal indicating the concentration of the gas to be measured based on the gas detection signal. The control circuit is configured to correct the output signal so that the output signal indicates a concentration of the gas to be measured higher than that indicated by the gas detection signal when a level of the gas detection signal output from the sensor part is less than a reference value corresponding to a level of the gas detection signal which is normally obtained when a concentration of the gas to be measured is a concentration value in normal time.
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公开(公告)号：US20240264102A1
公开(公告)日：2024-08-08
申请号：US18433793
申请日：2024-02-06
Applicant: TDK Corporation
Inventor： Sadaharu YONEDA , Yutaka MATSUO , Yoshio KAITA
CPC classification number: G01N25/18 , G01N33/0027
Abstract: Disclosed herein is a gas sensor that includes: a gas sensor part including a thermosensitive element, the gas sensor part being configured to generate a gas detection signal according to a concentration of a gas to be detected; a temperature sensor part configured to generate a temperature detection signal according to environmental temperature; a heater configured to heat the thermosensitive element; and a signal processing circuit configured to: control a heating temperature of the heater according to the temperature detection signal obtained at a first timing; and calculate the concentration of the gas to be detected according to the temperature detection signal obtained at a second timing that is later than the first timing and the gas detection signal obtained at a third timing at which the thermosensitive element is heated by the heater.
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公开(公告)号：US20240230570A9
公开(公告)日：2024-07-11
申请号：US18482431
申请日：2023-10-06
Applicant: TDK Corporation
Inventor： Yoshio KAITA , Yasuhiro INUI , Yutaka MATSUO
CPC classification number: G01N27/122 , G01N27/18 , G01N33/004
Abstract: Disclosed herein is a gas sensor that includes a sensor part configured to generate a gas detection signal in accordance with a concentration of a gas to be measured, and a control circuit configured to generate an output signal indicating the concentration of the gas to be measured based on the gas detection signal. The control circuit is configured to correct the output signal so that the output signal indicates a concentration of the gas to be measured higher than that indicated by the gas detection signal when a level of the gas detection signal output from the sensor part is less than a reference value corresponding to a level of the gas detection signal which is normally obtained when a concentration of the gas to be measured is a concentration value in normal time.
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公开(公告)号：US20210293735A1
公开(公告)日：2021-09-23
申请号：US17265958
申请日：2019-06-20
Applicant: TDK Corporation
Inventor： Yutaka MATSUO , Yoshio KAITA
IPC: G01N27/18
Abstract: A gas sensor includes a first thermistor as a detection element, a second thermistor as a reference element, a first heater for heating the first thermistor, a second heater for heating the second thermistor, and a control circuit that heats the first and second heaters such that the second thermistor has a higher temperature than the first thermistor in a first period of time and that the first thermistor has a higher temperature than the second thermistor in a second period of time.
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公开(公告)号：US20210003525A1
公开(公告)日：2021-01-07
申请号：US16649558
申请日：2018-09-05
Applicant: TDK Corporation
Inventor： Yoshio KAITA , Yutaka MATSUO
Abstract: A gas sensor includes: a first thermistor having a resistance value that changes according to a concentration of a first gas with a first sensitivity and changes according to a concentration of a second gas with a second sensitivity; a second thermistor connected in series to the first thermistor, the second thermistor having a resistance value that changes according to a concentration of the first gas with a third sensitivity that is lower than the first sensitivity and changes according to a concentration of the second gas with a fourth sensitivity that is different from the second sensitivity; and a correction resistor connected in parallel with the first or second thermistor.
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