公开(公告)号：GB2090050B

公开(公告)日：1984-11-21

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.

公开(公告)号：FR2382005B1

公开(公告)日：1984-10-19

申请号：FR7804941

申请日：1978-02-21

Applicant: WESTINGHOUSE ELECTRIC CORP

IPC: H02K9/00 ,  G01K11/00 ,  G01N27/64 ,  G01N27/66 ,  H01J41/08 ,  G01N15/00 ,  G01N27/62 ,  H02K9/08

Abstract: Apparatus for sensing overheated electrical insulation through the detection of thermoparticulates in a dynamoelectric machine's cooling gas system is disclosed. The cooling gas as it circulates will entrain thermoparticulates produced in the system when there is overheating. This gaseous carrier is then withdrawn and conducted to an ionization chamber where it is ionized. Downstream from the ionization chamber there is placed a first ion collector for collecting ions with relatively small radii. A second ion collector which is biased for collecting ions with relatively large radii is also placed downstream from the ionization chamber. By comparison of ion current from the first ion collector with ion current from the second ion collector it is possible to detect the presence of thermoparticulates in the cooling gas relatively independent of gas pressure, flow rate through the monitor, and effectiveness of the radiation source.

公开(公告)号：FR2317765B1

公开(公告)日：1982-04-02

申请号：FR7605608

申请日：1976-02-27

Applicant: GULF & WESTERN MFG CO

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

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.

公开(公告)号：GB1603702A

公开(公告)日：1981-11-25

申请号：GB1416578

申请日：1978-04-11

Applicant: CHLORIDE GROUP LTD

IPC: G08B17/113 ,  H01J41/08 ,  H01J47/02

Abstract: An inonisation chamber smoke detector in which a first electrode (11) is covered with an insulator (12) except at one end where it is opposed by a measuring electrode (15); the major part of the surface of the insulator (12) carries a conductor (41) not connected to the first electrode (11) to reduce the detrimental effect of condensation on the insulator (12).

公开(公告)号：SE7812025L

公开(公告)日：1979-10-20

申请号：SE7812025

申请日：1978-11-22

Applicant: ISOTEC IND LTD

Inventor： MALLORY J ,  TURLEJ Z

IPC: G08B17/113 ,  H01J41/08 ,  G08B17/10

公开(公告)号：FR2304916B3

公开(公告)日：1979-02-23

申请号：FR7508623

申请日：1975-03-19

Applicant: GAMMA ELECTRONIC

IPC: G01N27/66 ,  G08B17/11 ,  G08B17/113 ,  H01J41/08 ,  G01N27/62 ,  G08B17/10

公开(公告)号：DK139326B

公开(公告)日：1979-01-29

申请号：DK51076

申请日：1976-02-09

Applicant: GAMEWELL CORP

Inventor： SALOMON ELIAS E

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

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.

公开(公告)号：GB1528654A

公开(公告)日：1978-10-18

申请号：GB591776

申请日：1976-02-16

Applicant: STATITROL CORP

IPC: G01N27/64 ,  G08B17/10 ,  G08B17/11 ,  H01J41/08 ,  H01J39/28

Abstract: 1528654 Ionization aerosol detector STATITROL CORP 16 Feb 1976 [19 June 1975] 05917/76 Heading H1D An aerosol detector comprises first and second communicating ionization chambers 15 and 19, the second also communicating with the surrounding atmosphere, first and second electrodes 13 and 18A at respective remote ends of the two chambers and an intermediate electrode 16 at the junction of the two chambers, and a charged particle source 12 for irradiating both chambers, whereby an ion current flows through the chambers when a potential difference is applied between the electrodes 13 and 18A, and current changes due to entry of aerosols into the chamber 19 are measured as voltage changes on the electrode 16; the potential gradient and ion density in the chamber 15 are made considerably greater than in the chamber 19, so that only the second has a resistance characteristic sensitive to the presence of aerosols, the first maintaining a fixed resistance. The particle source 12 is preferably an alpha emitter. The electrode 16 is ring-shaped, and the electrode 18A is cylindrical and perforated. An electrostatic and air current shield 20, 21 is provided on the electrode 18A. The distance from the source 12 to the electrode 18A is made to correspond to the average particle range. The electrode 16 is connected to a field effect transistor in an alarm circuit.

公开(公告)号：DE2808018A1

公开(公告)日：1978-08-31

申请号：DE2808018

申请日：1978-02-24

Applicant: WESTINGHOUSE ELECTRIC CORP

Inventor： FORT EMIL M

IPC: H02K9/00 ,  G01K11/00 ,  G01N27/64 ,  G01N27/66 ,  H01J41/08 ,  G01N15/06 ,  G01N27/62 ,  H02H7/06

Abstract: Apparatus for sensing overheated electrical insulation through the detection of thermoparticulates in a dynamoelectric machine's cooling gas system is disclosed. The cooling gas as it circulates will entrain thermoparticulates produced in the system when there is overheating. This gaseous carrier is then withdrawn and conducted to an ionization chamber where it is ionized. Downstream from the ionization chamber there is placed a first ion collector for collecting ions with relatively small radii. A second ion collector which is biased for collecting ions with relatively large radii is also placed downstream from the ionization chamber. By comparison of ion current from the first ion collector with ion current from the second ion collector it is possible to detect the presence of thermoparticulates in the cooling gas relatively independent of gas pressure, flow rate through the monitor, and effectiveness of the radiation source.

公开(公告)号：CA1015072A

公开(公告)日：1977-08-02

申请号：CA200346

申请日：1974-05-21

Applicant: HONEYWELL INC

Inventor： LARSEN LARRY D ,  PEKAREK JOSEPH C ,  KOMPELIEN ARLON D ,  RORK GERALD D

IPC: G01N27/66 ,  G08B17/113 ,  H01J41/08