Abstract:
A solid state compact ion gauge includes an inlet, a gas ionizer, and a detector all formed within a cavity in a semiconductor substrate. The gas ionizer can be a solid state electron emitter with ion optics provided by electrodes formed in the cavity through which the cavity is evacuated by differential pumping. Preferably, the substrate is formed in two halves. The substrate halves are then bonded together after the components are provided therein.
Abstract:
Chamber (11, 12, 13) for bounding a plasma generation area (42) in a vacuum pressure sensor (40), wherein the chamber comprises an electrically conductive casing element (1, 1′, 1″) located radially on the outside relative to a central axis, wherein the chamber comprises electrically conductive wall elements (2, 2′, 2″) arranged substantially perpendicular to the central axis and connected to the casing element, wherein at least one of the wall elements has a first opening (3), through which the central axis extends, wherein the casing element comprises at least a first (B1) and a second region (B2), wherein the first region is located closer to the central axis than the second region. The invention further relates to a vacuum pressure sensor comprising the chamber.
Abstract:
A mass spectrometer is provided which is mounted on a wall portion of a chamber and analyzes a gas to be analyzed existing in the chamber. The mass spectrometer includes: a measurement unit which is inserted into the chamber at the time of mounting the mass spectrometer to the chamber and measures each partial pressure of gaseous components in the gas to be analyzed with respect to mass-to-charge ratios; a control unit which is disposed outside of the wall portion at the time of mounting the mass spectrometer on the chamber and is used to manipulate the measurement unit; and a display unit which is disposed outside of the wall portion at the time of mounting the mass spectrometer on the chamber and displays the measurement result of the measurement unit. Here, the measurement unit, the control unit, and the display unit are disposed close to each other.
Abstract:
In a quadrupole mass spectrometer which measures partial pressure strength according to a gas type in a vacuum system from ion current intensity, a quadrupole mass spectrometer with a total pressure measurement electrode has a total pressure measurement electrode for examining an ion density disposed in a demarcation space which is comprised of a grid electrode and an ion focusing electrode. And, a vacuum system is provided with only the quadrupole mass spectrometer which measures partial pressure strength according to a gas type in the vacuum system from an ion current intensity and does not have an ionization vacuum gauge other than the quadrupole mass spectrometer.
Abstract:
A solid state compact ion gauge includes an inlet, a gas ionizer, and a detector all formed within a cavity in a semiconductor substrate. The gas ionizer can be a solid state electron emitter with ion optics provided by electrodes formed in the cavity through which the cavity is evacuated by differential pumping. Preferably, the substrate is formed in two halves. The substrate halves are then bonded together after the components are provided therein.
Abstract:
A method for linearizing the sensitivity of a quadrupole mass spectrometric system to allow the sensor to more accurately report partial pressures of a gas in high pressure areas in which the reported data is effected by a number of loss mechanisms. According to the invention, correction factors can be applied empirically or software in a quadrupole mass analyzer system can be equipped with correcting software to expand the useful range of the mass spectrometer.
Abstract:
A dual beam ion source comprises an ion volume in an ion chamber, an ion collector, and two identical ion accelerators. One ion accelerator accelerates a first, "test" ion stream from the ion volume in a first direction and directs it to the ion collector where it can be directly measured. The second ion accelerator accelerates a second, "utilizable" ion stream from the ion volume in a second direction. By directly measuring the ion current (caused by the first, "test" ion stream) at the ion collector, either or both the total ion pressure of the gas within the ion volume, and the magnitude of the second, "utilizable" ion stream, can be calculated.
Abstract:
This invention relates to a method of operating quadrupole mass spectrometers with only an RF potential applied to the filter rods so that the spectrometer operates to pass all ions above a particular value of m/e. In practice, spectrometers operated in this way usually show a marked loss in transmission efficiency for ions of high m/e when operated with an RF potential low enough to pass ions of m/e