Abstract:
A cold cathode ionization vacuum gauge includes an extended anode electrode and a cathode electrode surrounding the anode electrode along its length and forming a discharge space between the anode electrode and the cathode electrode. The vacuum gauge further includes an electrically conductive guard ring electrode interposed between the cathode electrode and the anode electrode about a base of the anode electrode to collect leakage electrical current, and a discharge starter device disposed over and electrically connected with the guard ring electrode, the starter device having a plurality of tips directed toward the anode and forming a gap between the tips and the anode.
Abstract:
An ionization vacuum measuring cell comprises an anode (3A) and a cathode (4K) in a measuring chamber (107). The measuring chamber (107) is arranged in a housing (101) which has a vacuum-tight feedthrough (103) for a connection rod (104) of the cathode (4K) towards the outside. The measuring chamber (107) holds the rod (104) in a feedthrough (109) which is electrically insulating only. The measuring chamber (107) in the housing (101) can be exchanged by means of a releasable plug connection (106).
Abstract:
Die Erfindung bezieht sich auf einen Kaltkathoden-Drucksensor (10) mit einem gasdichten Gehäuse ( 12), mit einem Testgas-Einlass (18), einer Anode (14) und einer Kathode (16,17) in dem Gehäuse ( 12) und einer auf die Kathode (16,17) gerichteten Strahlungsquelle (20) zum Zünden einer Kaltkathoden-Entladung. Das Gehäuse (12) ist mindestens teilweise aus Glas gebildet. Die Strahlungsquelle (20) ist außerhalb des Gehäuses (12) angeordnet und strahlt durch das Gehäuse-Glas auf die Kathode (16,17). Die Strahlungsquelle (20) strahlt im Wesentlichen Strahlung einer Wellenlänge von mehr als 350 nm und weniger als 1.400 nm aus.
Abstract:
An ionization gauge includes an electron generator array that includes a microchannel plate that includes an electron generating portion of the microchannel plate comprising a source for generating seed electrons and an electron multiplier portion of the microchannel plate, responsive to the seed electrons generated by the electron generating portion, that multiplies the electrons. The ionization gauge includes an ionization volume in which the electrons impact a gaseous species, and a collector electrode for collecting ions formed by the impact between the electrons and gas species. The collector electrode can be surrounded by the anode, or the ionization gauge can be formed with multiple collector electrodes. The source of electrons can provide for a spontaneous emission of electrons, where the electrons are multiplied in a cascade.
Abstract:
An ionization gauge for isolating an electron source from gas molecules includes the electron source for generating electrons, a collector electrode for collecting ions formed by the impact between the electrons and gas molecules, and an electron window which isolates the electron source from the gas molecules. The ionization gauge can have an anode which defines an anode volume and retains the electrons in a region of the anode. The ionization gauge can have a plurality of electron sources and/or collector electrodes. The collector electrode(s) can be located within the anode volume or outside the anode volume. The ionization gauge can have a mass filter for separating the ions based on mass-to-charge ratio. The ionization gauge can be a Bayard-Alpert type that measures pressure or a residual gas analyzer that determines a gas type.
Abstract:
The invention pertains to a Penning measuring cell (1) with an electrode system that comprises an anode (5) and a cathode (2), which are situated in the magnetic field of a permanent magnet (8, 9), and with an ignition aid (11) for the electrode system (2, 5). To ensure rapid and reliable ignition the invention proposes attaching to the anode (5) as ignition aid (11) at least one metal strip (11) the free end of which extends towards the cathode (2).
Abstract:
A cold cathode ionization gauge includes a first electrode (12) and a second electrode (20) which are spaced apart and insulated from one another and have a common axis. A magnetic field generator surrounds the gauge and applies a magnetic field along the common axis of the electrodes. The magnetic field generator includes at least one pair of opposed axially magnetized magnets (32, 34) adjacent to each other. The magnet arrangement minimizes magnetic flux outside the gauge while increasing the strength of the magnetic flux inside the gauge. The magnetic arrangement also allows the gauge to be ignited in a very high vacuum, thereby extending the operating range of the gauge.
Abstract:
A total pressure cold cathode ionization gauge is disclosed. An inverted magnetron electrode design is capable of simultaneously detecting and measuring total gas pressure in a high vacuum system, along with partial pressures of one or more gases, such as hydrogen, helium and water. In addition, a leak detector, such as a helium leak detector, is disclosed with a compact counterflow arrangement of a gas inlet passage to an ion detection passage.