Abstract:
A cold cathode pressure sensor (10) comprises a gas-tight housing (12), a test gas inlet (18), an anode (14) and a cathode (16, 17) arranged in the housing (12), and a radiation source (20) directed towards the cathode (16, 17) in order to ignite a cold cathode discharge. The housing (12) is at least in part made of glass. The radiation source (20) is arranged outside the housing (12) and irradiates the cathode (16, 17) through the glass which makes up the housing. The wavelength of the radiation from the radiation source (20) ranges substantially from more than 350 nm to less than 1400 nm.
Abstract:
The invention concerns a vacuum-technology device (1) with a housing (3) and, inside the housing, electrodes between which a gas discharge is maintained while the device is operating, the device also having at least one magnet (4) whose field extends the path of the ionizing electrons. In order to simplify the design of a device of this kind, the invention proposes that the magnet (4) is located inside the housing (3) and forms one of the electrodes.
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 system of measuring and correcting for distortions in homodyne systems and a method for operating a data processing system to provide an estimate of distortions in homodyne systems are disclosed. The method for operating a data processing system to provide an estimate of a distortion introduced by a homodyne system when the homodyne system processes a time a multi-tone time domain input signal, x(t), to obtain a time domain output signal, y(t) includes receiving a frequency spectrum, X(f), of the multi-tone time domain input signal, x(t) and measuring an output frequency spectrum, Y(f), when the homodyne system operates on x(t). A plurality of parameters of a model that represents a linear frequency response of the homodyne system when operating on X(f) to arrive at Y(f) by fitting the model to Y(f) and X(f) is determined, and the model is applied to X(f) and Y(f) to estimate the distortions.
Abstract:
An ionization gauge includes an anode having a rod shape, and a cathode including a cathode plate having a through hole through which the anode extends. A shape of the through hole on a section along an axial direction of the anode includes a concave portion sandwiched between two convex portions.
Abstract:
An ionisation vacuum gauge for measuring the residual pressure of a gaseous material remaining in a container (10), more particularly after operation of a vacuum pump comprises an electron-emitting cathode (31) made by exploiting the nanotube technology, a grid (13; 33; 133; 133′) for accelerating the electrons emitted by the cathode, and a plate (15; 35) collecting the ions and/or the ionised positive molecules of the gas. Measuring the plate current by a galvanometer allows for determining the value of the residual pressure inside the container.