6results about How to "Short decay time" patented technology

The present invention belongs to the field of ceramic scintillators, and specifically discloses a heterovalent ion co-doped garnet transparent scintillating ceramic and a preparation method thereof; the ceramic structure has the following general formula: (R x A 3‑x‑ y A y ')(B 5‑z B' z ) 12 ; Wherein: R represents an activating ion and a sensitizer thereof, including at least one of Ce, Pr, Yb, and Cr elements; A is at least one of the rare earth elements Gd, Y, and Lu; A' represents a divalent cation, including at least one of the elements Mg, Ca, Sr, and Ba; B is at least one of the elements Al, Ga, and Sc; B' represents a tetravalent cation Si; x ranges from 0.0005 to 0.1, y ranges from 0.00005 to 0.01, and z ranges from 0.00005 to 0.01. The present invention uses a heterovalent ion to co-replace the balanced charge, so that the ceramic has the characteristics of high light yield, fast decay, and low afterglow. The ceramic is prepared based on a high-energy ball milling method to prepare powder, which is simple in process and can be mass-produced.

The invention particularly relates to a trace neodymium-doped phenylethylamine lead-bromine single crystal capable of simultaneously enhancing the light yield and shortening the decay time and application thereof, and solves the technical problem that in the prior art, the light yield is difficult to increase and the luminescence decay time is difficult to shorten at the same time. The trace neodymium-doped phenylethylamine lead-bromine single crystal capable of simultaneously enhancing the light yield and shortening the decay time is prepared by the following steps: 1) weighing; the preparation method comprises the following steps: weighing phenylethylamine hydrobromide, lead bromide and neodymium bromide, and putting into a glass bottle; the molar ratio of the phenylethylamine hydrobromide to the lead bromide to the neodymium bromide is 2: 1: (0.02-0.05); 2) obtaining a precursor solution; adding N, N-dimethylformamide into the glass bottle, heating and stirring until the N, N-dimethylformamide is completely dissolved to obtain a precursor solution; 3) obtaining a crystal; the precursor solution is filtered and then put into a glass beaker to be crystallized, and the neodymium-doped phenylethylamine lead-bromine single crystal is obtained; the radiation recombination rate is improved by adjusting the crystal energy band structure through neodymium.

The invention relates to scintillator glass melted in a high-concentration hydrogen atmosphere and a preparation method and application thereof. The preparation method comprises the following steps: preparing raw materials and mixing the raw materials; charging and melting in a high-concentration hydrogen atmosphere: charging the powder into a high-purity alumina crucible, then putting the crucible into a hearth of a high-concentration hydrogen atmosphere furnace, vacuumizing, introducing mixed gas into the high-concentration hydrogen atmosphere furnace, controlling the total flow of the mixed gas, and melting in the high-concentration hydrogen atmosphere furnace, when the pressure in the hearth is in a micro-positive pressure state, opening a one-way stop valve, controlling tail gas emission, starting an atmosphere furnace heating system, and heating, preserving heat and founding for a certain time; clarifying and homogenizing; molding by casting and annealing; and processing to obtain the scintillator glass. According to the invention, efficient formation and uniform dispersion of Ce < 3 + > are guaranteed through sufficient reduction, and finally, the scintillator glass reaches better levels in transmittance, light yield, decay time and irradiation resistance.

This invention relates to the field of high-sensitivity radiation detection technology, specifically disclosing a method for preparing silver-doped boron phosphate glass sheets and their applications. The invention involves mixing, degassing, and melting the component raw material powders, pouring the molten glass into a preheated graphite mold, and then annealing, grinding, polishing, and cutting to obtain silver-doped boron phosphate glass sheets. By precisely controlling the P:B ratio and annealing process, this invention introduces B-O-P bridging and B-O-B structures at the glass network structure level, significantly improving the structural and environmental stability of the glass and overcoming the technical defects of existing silver-doped phosphate glasses, such as easy hydrolysis and fragility. The prepared glass sheets exhibit excellent photoluminescence properties, with a good linear relationship between luminescence intensity and radiation dose in the 0-50 Gy dose range, and possess neutron detection potential. They can be applied in fields such as radiation monitoring, high spatial resolution X-ray imaging, non-destructive testing, biomedical imaging, and encryption and anti-counterfeiting technologies.

The invention provides an ultra-low afterglow fast scintillation attenuation rare earth orthosilicate scintillation material, a preparation method and an application, the chemical formula of the scintillation material based on the raw material ratio is RE2 (1-u-v-w) Ce2uM2vH2v + yN2wSi1-yAlyO5, H represents a hydrogen element and is provided by a preparation atmosphere, 0 < u < = 0.05, 0 < = v < = 0.02, 0 < w < = 0.05, 0 < = y < = 0.02, v + y > 0, RE represents a rare earth element, the rare earth element is selected from at least one of lutetium, yttrium, gadolinium and lanthanum, and y is greater than 0. The strong oxygen vacancy trapping type doping element comprises an aluminum element and / or an M element, the M element is selected from at least one of magnesium, calcium and nickel elements, N represents a strong carrier bound type doping element, and the strong carrier bound type doping element is selected from at least one of ytterbium, praseodymium and holmium elements. According to the rare earth orthosilicate scintillating material, the afterglow intensity can be reduced to below 200ppm (lower than 200ppm and 10ms) within 10ms after continuous irradiation is terminated, and can be reduced to below 20ppm (lower than 20ppm and 20ms) within 20ms, and meanwhile, the attenuation time for attenuating the scintillating light intensity to 1 / e of the original intensity under the irradiation of ionizing radiation is less than or equal to 15ns.

The invention discloses a flux linkage suppression-based low-voltage ride-through control method, device and system for a grid-forming doubly-fed motor, and a storage medium, and belongs to the technical field of power generation, power transformation or power distribution. The method comprises the following steps: firstly, locking a network construction control unit and obtaining an internal potential phase based on a virtual synchronous machine principle when a voltage drop occurs in a power grid; the proportionality coefficient of the excitation flux linkage ring is dynamically adjusted, so that the system damping is maximized, and the attenuation of the transient component of the stator flux linkage is accelerated; on the basis, a rotor current instruction is generated in real time according to voltage and current capacity limitation of a rotor-side converter, and a modulation signal is output to drive the converter in combination with a feed-forward compensation strategy and a resonance controller. According to the method, rotor overcurrent and overvoltage during a fault period can be effectively suppressed without adding any hardware circuit, the attenuation speed of a transient flux linkage is remarkably improved, meanwhile, the reactive power supporting capacity of a unit to a power grid is enhanced, and high-performance low-voltage ride-through of the grid-forming type doubly-fed motor is achieved.