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77results about "Multiplier dynodes" patented technology

Dynamic multi-stage serial connection coaxial butterfly-type channel dynode electron multiplier

The invention discloses a dynamic multi-stage serial connection coaxial butterfly-type channel dynode electron multiplier. The dynamic multi-stage serial connection coaxial butterfly-type channel dynode electron multiplier comprises a plurality of stages of butterfly-type dynodes sequentially distributed from inside to outside, an emission source, a voltage source and a drive device used for driving the multiple stages of butterfly-type dynodes to rotate, wherein the multiple stages of butterfly-type dynodes are sequentially arranged along a reflection path of electrons; each stage of butterfly-type dynode comprises a negative plate, a gate electrode and an arc support; the gate electrodes are of an annular structure; the cross section of each negative plate is of an arc structure; the circle centers of the negative plate in the multiple stages of butterfly-type dynodes coincide with a rotary shaft; the inner side faces of the negative plates are covered with reflection films; the negative plates are fixed on the arc surfaces of the corresponding arc supports; the gate electrodes are fixed on the lateral faces of the corresponding arc supports; one of each gate electrode is fixedly connected with one end of the corresponding negative plate; the voltage source comprises a power source and multiple resistors connected with the power source in series. The dynamic multi-stage serial connection coaxial butterfly-type channel dynode electron multiplier is long in service life, the actual use area of the negative plates is large, and the effective electron emissivity is high.
Owner:XI AN JIAOTONG UNIV

Automatic expansion focusing electrode for photomultiplier and photomultiplier

The invention discloses an automatic expansion focusing electrode and an automatic expansion focusing electrode-based photomultiplier. The photomultiplier comprises a high-vacuum seal shell, the automatic expansion focusing electrode, a high-quantum efficiency photocathode, an electronic multiplier system and a connection and lead system, wherein the high-vacuum seal shell has main functions of sealing and being used as a substrate for other films as a photomultiplier housing part; and the automatic expansion focusing electrode comprises a bottom plate, expansion blades and an automatic trigger mechanism as an electronic collector of the photomultiplier. The high-quantum efficiency photocathode is located in an upper area of the high-vacuum seal shell and converts incident photons into electrons. The electronic multiplier system is located at the lower part of the automatic expansion focusing electrode, amplifies the electrons collected by the focusing electrode and then leads out the electrons through the lead system. The automatic expansion focusing electrode touches the trigger mechanism in a photomultiplier packaging process, so that an expansion action of the automatic expansion focusing electrode is achieved and expansion of the radial size of the focusing electrode is achieved.
Owner:NORTH NIGHT VISION TECH

Non-contact object surface charge photomultiplier tube amplifier

ActiveCN105789016AHigh sensitivityReduce noiseMultiplier cathode arrangementsSecondary-electron emitting electrode tubesLow noiseSignal on
The invention relates to a non-contact object surface charge photomultiplier tube amplifier, belonging to the technical field of signal detection. The principle is as follows: the intensity of incident light is determined by the number of photons passing through a unit vertical area in unit time, and if the number of photons passing through a metal surface in unit time increases, the number of times that photons collide with the electrons in the metal increases, the number of photons escaping from the metal surface in unit time increases, and the photocurrent increases; and if the intensity of incident light remains unchanged and the number of times that photons collide with the electrons in the metal increases due to increase in the number of charges on the metal surface, the number of photoelectrons escaping from the metal surface in unit time increases. The number of photoelectrons is multiplied constantly by a photomultiplier tube, and the number of electrons collected by the anode finally can be increased 104-108 times. Because of high sensitivity and low noise of the photomultiplier tube, weak charge signals on the surface of a sample can be detected. The non-contact object surface charge photomultiplier tube amplifier can be widely used in the field of charge detection.
Owner:南通晶与电子科技有限公司

Novel silver-magnesium alloy dynode and preparation method thereof

ActiveCN110400737AIncreased secondary emission coefficientExempt from high temperature sensitization processPhoto-emissive cathodes manufactureSecondary emission electrodes manufactureSecondary emissionSurface layer
The invention relates to a novel silver-magnesium alloy dynode and a preparation method thereof, which belong to the technical field of photomultipliers and photoelectric device dynodes. The surface layer of the dynode is a magnesium nitride film layer, and the core layer is a magnesium oxide film layer. The secondary emission coefficient is 5 to 6 (150V), which is more than 20% higher than that of the existing magnesium oxide type silver-magnesium alloy dynode. The sensitivity and the gains of the tube can be significantly improved, the service life is prolonged and the yield of products is increased, and miniaturization and portability of the tube and the assembly are also facilitated. The core magnesium oxide film is formed by oxidation of the silver-magnesium alloy base layer, the surface magnesium nitride film is formed by nitridation of the silver-magnesium alloy, an extra-tube high-temperature activation process of the conventional magnesium oxide type silver-magnesium alloy dynode is saved in the process, the production cost is reduced, and the influences on the dynode by exposed air are completely eliminated. The novel silver-magnesium alloy dynode can be used in a photomultiplier tube electron multiplier and used as a multiplier in a optoelectronic device.
Owner:陈新云 +1
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