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    HYDROGEN SENSOR
    184.
    发明专利
    HYDROGEN SENSOR 未知

    公开(公告)号：GB2090050A

    公开(公告)日：1982-06-30

    申请号：GB8132591

    申请日：1981-10-29

    Applicant: GEN ELECTRIC

    IPC: G01N27/66 ,  G21C17/02 ,  G01N27/64 ,  H01J41/08 ,  H01J47/02

    Abstract: A hydrogen sensing device for determining the concentration of hydrogen in a fluid atmosphere consists of a sealed chamber formed with a window which selectively allows diffusion of hydrogen into the chamber. Alpha particles from a source contained in the chamber ionize the hydrogen and a pair of polarized electrodes collect the resulting electrons to provide a current which is a function of the hydrogen concentration in the chamber. A second window permeable to helium allows escape of the helium from the chamber that is formed by the combination of electrons with alpha particles therein.

    IONIZATION DETECTOR
    186.
    发明专利
    IONIZATION DETECTOR 未知

    公开(公告)号：CA1074461A

    公开(公告)日：1980-03-25

    申请号：CA244354

    申请日：1976-01-22

    Applicant: GAMEWELL CORP

    Inventor： SOLOMON ELIAS E

    IPC: H01J47/02 ,  G01N27/64 ,  G01T1/185 ,  G08B17/10 ,  G08B17/11 ,  G08B17/113 ,  H01J41/08 ,  A62C39/02

    Abstract: IONIZATION DETECTOR An ionization detecting fire alarm device that comprises a double chamber structure, a source disposed in at least one of the chambers and a vernier adjusting screw electrode protruding into one chamber. The chamber containing the adjustable electrode is more open to the atmosphere than the other chamber, porting is provided between chambers and detection occurs by sensing the rate of change of ionization current in the chamber structure. The source of sources, one being in each chamber, is a beta source such as a nickel 63 source. A change in ionization current is detected by a unique circuit of this invention which comprises a programable unijunction transistor oscillator circuit.

    Ionization smoke detector
    187.
    发明专利
    Ionization smoke detector 未知

    公开(公告)号：GB2019642A

    公开(公告)日：1979-10-31

    申请号：GB7845803

    申请日：1978-11-23

    Applicant: ISOTEC IND LTD

    IPC: G08B17/113 ,  H01J41/08 ,  H01J39/28

    Abstract: In an electronic smoke sensing and alarm device, a dual ionization chamber arrangement comprises a single source of radioactive material and first and second chambers separated by a common electrically conductive electrode. A portion of the radioactive material ionizes the air in the first chamber and another portion of the radioactive material ionizes the air in the second chamber. This arrangement provides an accurate control on the current flow through each chamber. A single source 36 of radioactive material, eg. Americium 241 or Nickel 63, may be disposed on a support 38 which is located on the partition 16 separating the two chambers 28 and 30 so that approximately the same amount of radioactive material is exposed in each chamber. The source and its support may be various shapes. Alternatively, the partition itself may be made up of a radioactive substance.

    UN APARATO PARA DETECTAR TERMOPARTICULAS EN UN PORTADOR GA- SEOSO
    189.
    发明专利
    UN APARATO PARA DETECTAR TERMOPARTICULAS EN UN PORTADOR GA- SEOSO 未知

    公开(公告)号：ES467248A1

    公开(公告)日：1979-08-16

    申请号：ES467248

    申请日：1978-02-23

    Applicant: WESTINGHOUSE ELECTRIC CORP

    IPC: H02K9/00 ,  G01K11/00 ,  G01N27/64 ,  G01N27/66 ,  H01J41/08 ,  H01J ,  H02K

    Abstract: Un aparato para detectar termopartículas en un portador gaseoso, que comprende una cámara de ionización de gas que incluye medios para efectuar la ionización del portador gaseoso, un primer detector que comprende un primer electrodo, un segundo electrodo, una envuelta exterior, y una tensión aplicada entre dichos primero y segundo electrodos, un segundo detector en disposición en serie con dicho primer detector y que comprende un tercer electrodo, un cuarto electrodo, una envuelta exterior, y una tensión aplicada entre dichos tercero y cuarto electrodos, un primer conducto para permitir el flujo de dicho gas ionizado con termopartículas cargadas dispersas en el mismo desde dicha cámara de ionización a dicho primer detector, siendo la tensión de dicho primer detector de un potencial tal que se asegura la electrodeposición sustancial de dichos iones libres del portador gaseoso, segundos medios de conducto para permitir el flujo de dichas termopartículas cargadas dispersas dentro de dicho portador gaseoso procedentes de dicho primer detector hacia dicho segundo detector, siendo la tensión de dicho segundo detector de un potencial tal que se asegura la electrodeposición de dichas termopartículas cargadas y medios para detectar el flujo de corriente entre dichos tercero y cuarto electrodos, y siendo producida dicha corriente por electrodeposición de dichas termopartículas.

    190.
    发明专利
    未知

    公开(公告)号：FR2317765A1

    公开(公告)日：1977-02-04

    申请号：FR7605608

    申请日：1976-02-27

    Applicant: GULF & WESTERN MFG CO

    IPC: G01N27/64 ,  G01T1/185 ,  G08B17/10 ,  H01J47/02 ,  G08B17/11 ,  G08B17/113 ,  H01J41/08 ,  H01J39/28 ,  A62C39/00 ,  G01N27/66

    Abstract: An ionization detecting fire alarm device that comprises a double chamber structure, a source disposed in at least one of the chambers and a vernier adjusting screw electrode protruding into one chamber. The chamber containing the adjustable electrode is more open to the atmosphere than the other chamber. Porting is provided between chambers and detection occurs by sensing the rate of change of ionization current in the chamber structure. The source or sources, one being in each chamber, is a beta source such as a nickel 63 source. A change in ionization current is detected by a unique circuit of this invention which comprises a programmable unijunction transistor oscillator circuit.

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