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    Electrochemical gas sensor
    2.
    发明授权
    Electrochemical gas sensor 有权

    公开(公告)号：US10976280B2

    公开(公告)日：2021-04-13

    申请号：US16308523

    申请日：2017-05-11

    申请人： Figaro Engineering Inc.

    发明人： Yoshihiro Yamamoto ,  Kuniyuki Izawa

    IPC分类号： G01N27/404 ,  G01N27/407 ,  G01N27/416 ,  G01N27/417

    摘要： An electrochemical gas sensor has a planar ceramic housing having a recess, a MEA, first and second electrically conductive gas diffusion membranes, and a metal lid fixed on the housing so as to cover the recess. The MEA is provided with an ionic conductive membrane, a first electrode on a surface of the membrane, and a second electrode on the opposite surface of the membrane. The first electrically conductive gas diffusion membrane is electrically connected to the first electrical connection. The second electrically conductive gas diffusion membrane is electrically connected to the second electrical connection. The lid presses the second electrically conductive gas diffusion membrane toward the MEA, and in the lid or in the bottom of the housing, a gas inlet is provided. The electrochemical gas sensor is easily made compact, small in the variations in the performances, and easily installed on a print circuit board.

    Electrochemical Gas Sensor
    4.
    发明申请
    Electrochemical Gas Sensor 审中-公开

    公开(公告)号：US20190339226A1

    公开(公告)日：2019-11-07

    申请号：US16308523

    申请日：2017-05-11

    申请人： Figaro Engineering Inc.

    发明人： Yoshihiro Yamamoto ,  Kuniyuki Izawa

    IPC分类号： G01N27/407 ,  G01N27/416 ,  G01N27/417 ,  G01N27/404

    摘要： An electrochemical gas sensor has a planar ceramic housing having a recess, a MEA, first and second electrically conductive gas diffusion membranes, and a metal lid fixed on the housing so as to cover the recess. The MEA is provided with an ionic conductive membrane, a first electrode on a surface of the membrane, and a second electrode on the opposite surface of the membrane. The first electrically conductive gas diffusion membrane is electrically connected to the first electrical connection. The second electrically conductive gas diffusion membrane is electrically connected to the second electrical connection. The lid presses the second electrically conductive gas diffusion membrane toward the MEA, and in the lid or in the bottom of the housing, a gas inlet is provided. The electrochemical gas sensor is easily made compact, small in the variations in the performances, and easily installed on a print circuit board.

    Gas Sensor
    5.
    发明申请
    Gas Sensor 审中-公开

    公开(公告)号：US20190137426A1

    公开(公告)日：2019-05-09

    申请号：US16308546

    申请日：2017-05-11

    申请人： Figaro Engineering Inc.

    发明人： Kenichi Yoshioka

    IPC分类号： G01N27/12

    摘要： Through a silica-based adsorbent filter containing sulfo group, surrounding atmosphere is introduced to a gas sensing element. The diameter D in mm of an opening in a housing at a position covering the filter and the length L in mm of the filter along the direction from the opening toward the gas sensing element are related as 0.1≤D≤1.5, 2≤L≤12, L/D2/3≤10, 5≤L/D. The detection delay for a gas to be detected is kept within an allowable range, the size of the sensor is not made too large, and the long-term stability of the gas sensor is improved.

    Gas detector comprising plural gas sensors and gas detection method thereby
    7.
    发明授权
    Gas detector comprising plural gas sensors and gas detection method thereby 有权

    公开(公告)号：US11506622B2

    公开(公告)日：2022-11-22

    申请号：US16931485

    申请日：2020-07-17

    申请人： Figaro Engineering Inc.

    发明人： Masafumi Toyota ,  Kunihiko Maejima ,  Tomohiro Kawaguchi ,  Tatsuya Ishimoto

    IPC分类号： G01N27/12 ,  G01N33/00 ,  G01M3/40

    摘要： A gas detector includes metal-oxide semiconductor gas sensors and their driving circuit. The gas detector stores the ratio of initial gas sensor resistance in air and that in an atmosphere including Freon gas, for the gas sensors. The gas detector learns sensor resistance in air for a gas sensor in use and detects Freon gas by comparing the sensor resistance of the gas sensor in use with the learned resistance in air divided by the ratio. When the first gas sensor has been used for a predetermined period, both the first gas sensor and a second gas sensor are used for a learning period to continue detection of Freon by the first gas sensor and to learn the resistance in air of the second gas sensor. After completion of the learning period, Freon is detected by the second gas sensor.

    GAS DETECTION DEVICE AND GAS DETECTION METHOD
    8.
    发明申请
    GAS DETECTION DEVICE AND GAS DETECTION METHOD 有权

    公开(公告)号：US20210270760A1

    公开(公告)日：2021-09-02

    申请号：US16973063

    申请日：2019-04-24

    申请人： Figaro Engineering Inc.

    发明人： Masakazu SAI ,  Kuniyuki IZAWA ,  Tomohiro KAWAGUCHI

    IPC分类号： G01N27/12

    摘要： A gas detector uses a MEMS gas sensor having: a substrate provided with a cavity and an insulating film over the cavity; a metal oxide semiconductor and a heater both provided on the insulating film. A drive circuit operates the heater with a predetermined period for a predetermined pulse duration in order to heat the metal oxide semiconductor. The drive circuit halts operation of the heater or elongates the period when a humidity sensor detects that the atmosphere is humid.