10 results about "Dynode" patented technology

The invention discloses a method for simply and rapidly installing a dynode of an electron multiplier, and belongs to the field of electron multiplier assembly. According to the method, extra tools are not needed, and only three long screws and a pair of pointed tweezers need to be additionally used. According to the method, the problem that time and labor are wasted when the ceramic plate of the multiplier and nine dynodes are folded and aligned is solved, and the installation of the dynodes can be effectively accelerated. During installation, the three long screws are inserted into the through holes of the ceramic plate bottom plate, then the screws are sleeved with the limiting stainless steel cylinders respectively, then the nine dynodes and the collecting plate are sequentially installed on the ceramic plate bottom plate, then the ceramic plate top plate is sleeved with the three screws, the hexagonal studs are screwed, and the ceramic plate top plate is installed on the ceramic plate bottom plate. And the distance between the top and bottom ceramic plates is about 4mm longer than that of the limiting stainless steel cylinder. The nine dynodes and the collecting plate are sequentially stirred through pointed tweezers, the upper feet of the dynodes and the collecting plate enter the small mounting holes corresponding to the top plate of the ceramic plate, the lower feet of the dynodes do not leave the small mounting holes corresponding to the bottom ceramic plate, and the top ceramic plate and the bottom ceramic plate are tightened after completion. And the long screws are replaced by the original screws of the multiplier in sequence, and the dynode is assembled.

The invention relates to a micro-channel plate manufacturing method based on a mold pouring method and a micro-channel plate. The method comprises the steps that a silicon microchannel array substrate is placed on a metal mold material, and holes of the silicon microchannel array substrate face downwards; based on a crucible and a vacuum hot melting filling device, liquefying a metal mold material and filling the metal mold material into the silicon micro-channel array substrate; cooling to realize metal curing to obtain a metal mold precursor, and corroding silicon to obtain a metal mold; putting the high borosilicate glass material and the metal mold into a crucible, and filling the high borosilicate glass material into the metal mold based on a vacuum hot melting filling device; cooling to obtain a glass-metal complex, and corroding a metal material to obtain a micro-channel plate substrate; carrying out hydroxylation treatment; and preparing a dynode on the micro-channel plate substrate, and performing annealing treatment to obtain the micro-channel plate. The microchannel plate with a high softening point and high purity can be manufactured, the yield is high, noise is low, exhaust in the channel is sufficient, and the service life of the image tube is prolonged.

An ion detector includes a conversion dynode including a conversion region where electrons are emitted by incident ions, an electron multiplier including an electron incident surface on which the electrons are incident, and an aperture electrode including an aperture through which the electrons traveling from the conversion region to the electron incident surface pass. The conversion region is a region protruding toward a space where the electrons are emitted.

A sample analyzer, a photometer and a photometric system. The sample analyzer (2000) comprises a light source (100), a photometer (600) and a processor (500); the photometer (600) comprises a photoelectric conversion assembly (401) and a signal processing assembly (400); the photoelectric conversion assembly (401) comprises a photomultiplier tube (200) and a voltage divider circuit (300), an input end node of the voltage divider circuit (300) being connected to the cathode of the photomultiplier tube (200), and an output end node of the voltage divider circuit (300) being connected to the anode of the photomultiplier tube (200). N+1 voltage divider nodes are sequentially arranged between the input end node and the output end node, and the N+1 voltage divider nodes are respectively and sequentially connected to a photoelectron focusing electrode and N dynodes of the photomultiplier tube (200), such that voltage divider branches between two adjacent nodes form N+2 divided voltages; at least one of the divided voltage corresponding to the input end node, the divided voltage corresponding to the voltage divider node N+1, and the divided voltage corresponding to the voltage divider node N is configured to be less than the divided voltages corresponding to the other voltage divider nodes.

A sample analyzer, a photometer, and a photometric system. The sample analyzer (2000) comprises a light source (100), a photometer (600), and a processor (500); the photometer (600) comprises a photoelectric conversion assembly (401) and a signal processing assembly (400); the photoelectric conversion assembly (401) comprises a photomultiplier tube (200) and a voltage divider circuit (300); an input end node of the voltage divider circuit (300) is connected to a cathode of the photomultiplier tube (200); an output end node of the voltage divider circuit (300) is connected to an anode of the photomultiplier tube (200); N+1 voltage divider nodes are sequentially arranged between the input end node and the output end node; the N+1 voltage divider nodes are respectively connected to a photoelectron focusing electrode and N dynodes of the photomultiplier tube (200) in sequence, and voltage divider branches between adjacent nodes form N+2 divided voltages; at least one of the divided voltage corresponding to the input end node, the divided voltage corresponding to the voltage divider node N+1, and the divided voltage corresponding to the voltage divider node N is configured to be less than the divided voltages corresponding to the other voltage divider nodes.

This invention discloses a photomultiplier tube (PMT) dynode film preparation system and method belonging to the field of PMT technology. The system includes a PMT, a vacuum system, and an alkali source assembly. The alkali source assembly includes an external glass tube and internal K, Na, and Cs sources. One end of the glass tube is closed, and the other end is connected to the vacuum system via a tail tube. One end of the PMT is also closed, and the other end is connected to the vacuum system via a tail tube. The K, Na, and Cs sources are connected to pin electrodes via nickel wires to form a circuit. Eleven pin electrodes are led out from the inside of the PMT. This invention can accurately and effectively monitor the secondary electron emission capability of the dynode film, solving the problem of lack of quality control in the dynode preparation process. Furthermore, it improves the secondary electron emission coefficient of the dynode film, resulting in a significant increase in overall PMT gain and achieving good consistency.

Provided is a photomultiplier tube including: a photoelectric surface configured to emit photoelectrons in response to incident light; an electron multiplying unit including a plurality of dynodes configured to emit secondary electrons in response to incidence of the photoelectrons emitted from the photoelectric surface and to multiply the secondary electrons; an acceleration electrode disposed between the photoelectric surface and the electron multiplying unit and configured to accelerate the photoelectrons to be incident to the electron multiplying unit; and a tubular accommodation container accommodating the photoelectric surface, the acceleration electrode, and the electron multiplying unit.

The application discloses a high-collection-efficiency large-area micro-channel plate photomultiplier, which comprises a vacuum glass container, a photoelectric cathode, a focusing electrode, a micro-channel plate electron multiplier, an anode and a power supply wire; the photoelectric cathode is covered on the inner surface of the vacuum glass container; the focusing electrode is arranged directly below the photoelectric cathode; the diameter of the top opening of the focusing electrode is larger than the diameter of the bottom opening and smaller than the diameter of the photoelectric cathode; a high secondary electron emission material layer is uniformly covered on the inner wall of the focusing electrode; the micro-channel plate electron multiplier is arranged at the bottom opening of the focusing electrode; the voltage of the focusing electrode is smaller than the input voltage of the micro-channel plate electron multiplier; the anode is arranged directly below the output end of the micro-channel plate electron multiplier; and the photoelectric cathode, the focusing electrode, the micro-channel plate electron multiplier and the anode are powered through the power supply wire. Under the high collection effect, the collection efficiency of the large-area micro-channel plate photomultiplier can be greatly improved.

The effective quantum efficiency of a metal-channel photomultiplier tube can be increased with an optical system. The optical system can direct incident light from areas of low efficiency on the cathode of the metal-channel photomultiplier tube instead to areas of high efficiency on the cathode. These high-efficiency areas of the cathode can correspond to a position between the dynode structure.

The invention discloses a method for preparing a beryllium-copper-based high-entropy alloy strip by adopting vacuum magnetic suspension, and relates to a method for preparing a beryllium-copper-based alloy strip for a photomultiplier. The invention aims to solve the problems that the traditional Cu-Be alloy strip can only form a BeO single film, the secondary electronic performance is insufficient, and multiple performances are difficult to meet; the traditional smelted high-entropy alloy is easy to generate segregation; the problems of blindness, easy damage to a matrix, many chemical residues and the like of a traditional brushing process are solved. The method comprises the following steps: 1, vacuum magnetic suspension casting; 2, throwing the blank; 3, quenching; 4, mechanical brushing; (5) rolling; 6, rolling by a four-roller mill; 7, rolling by using a six-roller mill; 8, performing online annealing; 9, rolling by a 20-roller rolling mill; tenthly, online annealing is conducted; 11, trimming; 12, stretch bending and straightening; 13, alternating current cleaning and brushing; and 14, rolling. The method is different from a traditional strip preparation process combining smelting and mechanical brushing, blank manufacturing is conducted in a small vacuum magnetic suspension smelting and continuous blank drawing mode, surface treatment is conducted on the rolled plate through the composite surface treatment technology combining the electric field effect and mechanical brushing, and controllable coil weight preparation and targeted surface cleaning are achieved. According to the preparation method, the Cu-Be-Al-Mg-Y-Ce alloy composite strip for the photomultiplier can be obtained.