公开(公告)号：US20240053261A1

公开(公告)日：2024-02-15

申请号：US18269322

申请日：2021-12-15

Applicant: National University Corporation YOKOHAMA National University ,  FIGARO ENGINEERING INC.

Inventor： Yoshiaki NISHIJIMA ,  Hiromasa TAKASHIMA ,  Tsuyoshi UEDA ,  Tomohiro KAWAGUCHI ,  Soichiro SAKAI

IPC: G01N21/3504 ,  G01N21/552

CPC classification number: G01N21/3504 ,  G01N21/554

Abstract: The infrared absorber 1 is provided with a finely structured metal layer 2 which causes local surface plasmon resonance by absorption infrared light; a dielectric layer 3 under the finely structured metal layer, and a metal layer 4 under the dielectric layer 3. The dielectric layer 3 is stacked between the layers 2 and 4 and consists of an organic polymer material having a molecular bond whose vibration is excited by infrared absorption. Further, the gas sensor is provided with the infrared absorber as the light source and/or the photodetector.

公开(公告)号：US11506622B2

公开(公告)日：2022-11-22

申请号：US16931485

申请日：2020-07-17

Applicant: Figaro Engineering Inc.

Inventor： Masafumi Toyota ,  Kunihiko Maejima ,  Tomohiro Kawaguchi ,  Tatsuya Ishimoto

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

Abstract: 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.

公开(公告)号：US20210270760A1

公开(公告)日：2021-09-02

申请号：US16973063

申请日：2019-04-24

Applicant: Figaro Engineering Inc.

Inventor： Masakazu SAI ,  Kuniyuki IZAWA ,  Tomohiro KAWAGUCHI

IPC: G01N27/12

Abstract: 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.

公开(公告)号：US20050121338A1

公开(公告)日：2005-06-09

申请号：US11025992

申请日：2005-01-03

Applicant: Tomohiro Inoue

Inventor： Tomohiro Inoue

IPC: G01N27/406 ,  C12P13/02 ,  G01N27/26 ,  G01N27/416 ,  G01N27/417 ,  G01N27/49

CPC classification number: C12P13/02 ,  G01N27/4163 ,  G01N27/4175

Abstract: An electrochemical gas sensor is self-diagnosed on the basis of an output waveform that is generated when a power source of said gas sensor is turned on after said power source has been turned off for a short time and an output waveform that is generated when said power source is turned on after said power source has been turned off for a long time. In a normal gas sensor, when the power source is turned on after the power source has been turned off for the short time, a bottom will be generated in the potential of the sensing electrode side, and when the power source is turned on after the power source has been turned off for the long time, a peak will be generated in the potential of the sensing electrode side. A self-diagnosis of the electrochemical gas sensor can be done without pulse power source for self-diagnosis, and the dead time from self-diagnosis until start of detection can be shortened.

Abstract translation: 电化学气体传感器是基于在所述电源已经短时间关闭之后所述气体传感器的电源被接通时产生的输出波形和当所述电源已经被关闭时产生的输出波形而被自诊断的 在所述电源长时间关闭之后，电源被接通。 在正常的气体传感器中，当在短时间内关闭电源之后电源被接通时，在感测电极侧的电位中将产生底部，并且当电源在 电源已经长时间关闭，感应电极侧的电位将产生峰值。 可以进行电化学气体传感器的自诊断，无需脉冲电源进行自我诊断，可以缩短自诊断到检测开始的死区时间。

公开(公告)号：US4718991A

公开(公告)日：1988-01-12

申请号：US5245

申请日：1987-01-20

Applicant: Noboru Yamazoe ,  Norio Miura

Inventor： Noboru Yamazoe ,  Norio Miura

IPC: G01N27/416 ,  G01N27/02 ,  G01N27/12 ,  G01N27/407 ,  G01N27/56

CPC classification number: G01N27/4074 ,  Y10T436/22

Abstract: A proton conductor gas sensor operable at room temperature for detecting hydrogen or carbon monoxide, and a gas detecting method using the sensor. A pair of electrodes connected to a proton conductor are short-circuited to cause protons to travel through the conductor utilizing the difference in activity between the electrodes or the difference in gas permeability between the electrode and an atmosphere containing the gas to be detected. The potential difference produced in the interior of the conductor by the travel of the protons is obtained as the output of the sensor. This output is in proportion to the concentration of the gas and low in humidity dependence.

Abstract translation: 可在室温下操作以检测氢或一氧化碳的质子导体气体传感器，以及使用该传感器的气体检测方法。 连接到质子导体的一对电极被短路以利用电极之间的活动差异或电极和含有待检测气体的气体之间的气体渗透性差异而使质子行进通过导体。 通过质子的行进在导体内部产生的电位差作为传感器的输出获得。 该输出与气体的浓度成正比，湿度依赖性低。

公开(公告)号：US11940432B2

公开(公告)日：2024-03-26

申请号：US17267059

申请日：2019-07-25

Applicant: Figaro Engineering Inc. ,  New Cosmos Electric Co., Ltd. ,  University Public Corporation Osaka

Inventor： Masato Takeuchi ,  Junpei Furuno ,  Kenta Fukui ,  Kuniyuki Izawa ,  Masakazu Sai ,  Hirokazu Mitsuhashi ,  Takafumi Taniguchi

IPC: G01N33/00 ,  B01D71/08 ,  B01D71/22

CPC classification number: G01N33/0014 ,  B01D71/08 ,  B01D71/22

Abstract: A gas detector comprises a gas detection unit and a filter introducing surrounding atmosphere to the gas detection unit. The filter comprises a gas-permeable organic polymer membrane having an acidic group or a basic group.

公开(公告)号：US11567021B2

公开(公告)日：2023-01-31

申请号：US16973063

申请日：2019-04-24

Applicant: Figaro Engineering Inc.

Inventor： Masakazu Sai ,  Kuniyuki Izawa ,  Tomohiro Kawaguchi

IPC: G01N27/12

Abstract: 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.

公开(公告)号：US20220163474A1

公开(公告)日：2022-05-26

申请号：US17432973

申请日：2020-03-17

Applicant: Figaro Engineering Inc. ,  University of Fukui

Inventor： Masakazu SAI ,  Kenichi YOSHIOKA ,  Kuniyuki IZAWA ,  Toshikazu SAKAGUCHI

IPC: G01N27/12 ,  B01D53/22 ,  B01D71/44 ,  B01D69/10 ,  B01D69/02 ,  G01N33/00

Abstract: A gas sensor comprises a gas separation membrane comprising substituted polyacetylene where a substituent group is combined to a double-bonded carbon atom in the backbone chain of the substituted polyacetylene and a sensing element configured to detect gas permeated through the gas separation membrane.

公开(公告)号：US20210247341A1

公开(公告)日：2021-08-12

申请号：US17054893

申请日：2019-03-01

Applicant: Figaro Engineering Inc.

Inventor： Kuniyuki IZAWA

IPC: G01N27/12 ,  G01N33/00

Abstract: A gas detector comprises a metal oxide semiconductor gas sensor whose resistance decreases in reducing gases and a digital information processing device that treats the output of the gas sensor and compares the output with a comparison value for gas detection. The digital information processing device extracts data representing the resistance of the gas sensor in air from the output of the gas sensor and generates the comparison value such that the larger the resistance of the gas sensor in air is, the larger the ratio between the resistance of the gas sensor in air and a resistance value corresponding to the comparison value is.

公开(公告)号：US20010003916A1

公开(公告)日：2001-06-21

申请号：US09734546

申请日：2000-12-13

Applicant: Figaro Engineering, Inc.

Inventor： Tohru Nomura ,  Hideki Okoshi ,  Tomoko Yoshimura

IPC: G01N007/00 ,  G01N019/10

CPC classification number: G01N33/004 ,  G01N27/12 ,  G01N33/0047

Abstract: A central electrode 12 is arranged in a coiled heater electrode 10. They are buried in a SnO2-based inner area 6, and the entirety is covered by a filter 8. The volume of the inner area 6 is set at from 1null10null3 mm3 to 16null10null3 mm3, the total volume of the bead 4 is set at from 15null10null3 mm3 to 70null10null3 mm3, and the ratio of the total volume of the bead 4 to the volume of the inner area 6 is set at from 4 to 20 to bring the sensor resistance in CO and that in methane closer to each other and increase the selectivity from hydrogen.

Abstract translation: 中心电极12布置在线圈加热器电极10中。它们被埋在基于SnO 2的内部区域6中，并且整个被过滤器8覆盖。内部区域6的体积设定为1×10 -3 mm 3 到16×10 -3 mm 3，珠4的总体积设定为15×10 -3 mm 3〜70×10 -3 mm 3，珠4的总体积与内区6的体积的比率设定为 4至20以使传感器电阻在CO和甲烷中的电阻更接近并增加氢的选择性。