摘要:
According to the invention, at least one magnet element is provided for generating a guide magnetic field such that the electrons are guided at a spacing from the elongated anode. At least one kicker magnet is provided for generating a kicker magnetic field such that the electrons are steered onto the elongated anode in the region of the kicker magnetic field. The kicker magnet is implemented as a permanent magnet.
摘要:
A protective layer is provided for an image detector used for an x-ray image. This image detector comprises a layer of luminescent material that is to be protected against mechanical stress and moisture. A polymeric protective layer is disposed thereupon and is hardened exclusively in an area which does not border the layer of luminescent material. The hardened area provides protection against mechanical stress while the remaining area forms a moisture barrier. An appertaining method is provided for producing a polymeric protective layer on an image detector for an x-ray image, which is provided with a layer of luminescent material. The protective layer is deposited on the layer of luminescent material and then is hardened only in an area which does not border the layer of luminescent material.
摘要:
A protective layer is provided for an image detector used for an x-ray image. This image detector comprises a layer of luminescent material that is to be protected against mechanical stress and moisture. A polymeric protective layer is disposed thereupon and is hardened exclusively in an area which does not border the layer of luminescent material. The hardened area provides protection against mechanical stress while the remaining area forms a moisture barrier. An appertaining method is provided for producing a polymeric protective layer on an image detector for an x-ray image, which is provided with a layer of luminescent material. The protective layer is deposited on the layer of luminescent material and then is hardened only in an area which does not border the layer of luminescent material.
摘要:
A thermionic emitter has a flat emission surface that is subdivided by slits into generally spiral or serpentine conductor sections, the surface having legs extending therefrom that form part of the current supply terminals and that also serve for securing the emitter. Each of these legs has a portion with a longitudinal electrical resistance that is elevated compared to that of the conductor sections, such that areas of maximum temperature migrate from the middle of the emitter to its edges as the heating current increases.
摘要:
An anode for an x-ray tube has an incident surface on which an electron beam is incident for generating x-rays emanating from a focal spot. In at least that region wherein the focal spot is located during operation of the x-ray tube, the incident surface has a step-like structure with end faces that reside at a substantially right angle relative to the electron beam during operation of the x-ray tube. The end faces are connected by respective sidewalls, and backscattered electrons from the end faces strike the sidewalls and generate x-rays in addition to x-rays emanating from the end faces struck by the electron beam, thereby improving the efficiency of x-ray generation. A similar improvement can be achieved by an anode having a roughened surface in the region of the focal spot.
摘要:
In an electronic x-ray computed tomography apparatus that enables a scanning of approximately 360.degree., the electron beam is guided in an annularly fashioned magnet arrangement that has a U-shaped cross section. The U enables the guidance of the electron beam to the annular anode and enables the emergence of the x-radiation. The magnet arrangement is composed of a number of side-by-side U-shaped magnet elements arranged to form an annulus with a coil for excitation of the magnet element respectively arranged on the cross bar of each U. A single magnetic arrangement is thus used to generate both the electron beam guidance field and, by means of a sudden polarity reversal of a magnet element disposed at a desired deflection location, the deflection field.
摘要:
A scintillator plate has a radiation-permeable substrate on which is applied a scintillator layer made of copper iodide that is formed from spicular crystals. The scintillator layer has an emission maximum in the red spectral range. The scintillator layer of the scintillator plate has a high emission power in the near-infrared range.
摘要:
The invention describes a dispenser (1) for automatically dispensing semi-fluid media, in particular toothpaste, from a tube with a mouthpiece, comprising a housing (2) with an orifice (3) and having at least one portion measuring unit (4) for the tube in the interior, a switch (6), a motor (20), a drive mechanism (5) and a control unit (7), whereby a brush is positioned in the orifice (3) in order to charge it with semi-fluid medium. In order to transport the brush automatically from the orifice (3) in the direction of the mouthpiece of the tube, at least one drive mechanism (5) is provided on a positioning mechanism (8), in particular a gear (33) with at least one driver (34).
摘要:
An optical multi-port element with an acousto-optical modulator (AOM) has at least two monomode optical waveguide connections, at one side thereof. The end surfaces of the waveguides disposed in the focal plane of a lens situated between the optical waveguides and the acousto-optical modulator. In order to obtain a construction which can be adjusted in a simple manner and which has low attenuation, with a small overall length, it is provided that at least one side of the AOM (1) a single lens (2,3,31) is disposed with its optical axis aligned to the transmission axis of the AOM (1), and that the optical wave-guides (4 to 6, 18 to 20 or 27,28) are disposed with their axes parallel to one another and spaced from the optical axis of the lens (2,3,31) in such a manner that parallel beams (14 to 17), leading from the lens (2,3,31) to the AOM (1), are directed to the active region of the AOM (1) at the Bragg angle to the optical axis.
摘要:
A liquid metal bearing includes at least one first bearing part and at least one second bearing part that have a non-positive fit connection to one another. At least one first ductile sealing layer is disposed at least partly between at least a first bearing part of the at least one bearing and a second bearing part of the at least one second bearing part.