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53 results about "Cherenkov radiation" patented technology
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Cherenkov radiation (IPA: /tʃɛrɛnˈkɔv/, Russian: Черенков) is electromagnetic radiation emitted when a charged particle (such as an electron) passes through a dielectric medium at a speed greater than the phase velocity of light in that medium. The characteristic blue glow of an underwater nuclear reactor is due to Cherenkov radiation. It is named for Soviet physicist Pavel Cherenkov, who shared the 1958 Nobel Prize in Physics for its discovery.
Blue extended super continuum light source
InactiveUS7800818B2Increase powerLaser using scattering effectsSemiconductor/solid-state device manufacturingInstabilityRefractive index
Owner:NKT PHOTONICS
Method and optical fiber device for production of low noise continuum
InactiveUS20060159398A1New design degreeCladded optical fibreCoupling light guidesLow noisePolarization-maintaining optical fiber
Owner:UNIVERSITY OF ROCHESTER
Method and optical fiber device for production of low noise continuum
InactiveUS7403688B2Reduce noiseCladded optical fibreCoupling light guidesLow noisePolarization-maintaining optical fiber
Owner:UNIVERSITY OF ROCHESTER
Optical frequency up-conversion of femtosecond pulses into targeted single bands in the visible and ultraviolet
An apparatus and methods for generating a substantially supercontinuum-free widely-tunable multimilliwatt source of radiation characterized by a narrowband line profile. The apparatus and methods employ nonlinear optical mechanisms in a nonlinear photonic crystal fiber (PCF) by detuning the wavelength of a pump laser to a significant extent relative to the zero-dispersion wavelength (ZDW) of the PCF. Optical phenomena employed for the selective up-conversion in the PCF include, but are not limited to, four-wave mixing and Cherenkov radiation. Tunability is achieved by varying pump wavelength and power and by substituting different types of PCFs characterized by specified dispersion properties.
Owner:THE BOARD OF TRUSTEES OF THE UNIV OF ILLINOIS
Production of optical pulses at a desired wavelength utilizing higher-order-mode (HOM) fiber
An apparatus and method for producing optical pulses of a desired wavelength utilizes a section of higher-order-mode (HOM) fiber to receive input optical pulses at a first wavelength, and thereafter produce output optical pulses at the desired wavelength through soliton self-frequency shifting (SSFS) or Cherenkov radiation. The HOM fiber is configured to exhibit a large positive dispersion and effective area at wavelengths less than 1300 nm.
Owner:FURAKAWA ELECTRIC NORTH AMERICA INC
Production of optical pulses at a desired wavelength utilizing higher-order-mode (HOM) fiber
Owner:OFS FITEL LLC
Real-time monitoring device for neutron flux in fission reaction
ActiveCN104464856AHigh measurement accuracyShort glow timeNuclear energy generationMeasurement with scintillation detectorsGamma rayFluorescent light
The invention discloses a real-time monitoring device for the neutron flux in a fission reaction. The device is characterized in that a fast neutron conversion body (1), a fluorescent light reflection tube (3), a boron plastic flash body (2), a Cherenkov light reflection tube (5) and a Cherenkov radiation body (4) are arranged in the incident direction of particles in sequence; neutrons and gamma rays enter the boron plastic flash body (2) to interact with substances to generate e+ / e-, recoil protons and alpha particles, the e+ / e-, the recoil protons and the alpha particles are excited to generate fluorescent light, and the fluorescent light enters a first photoelectric multiplier tube (7) through reflection of the fluorescent light reflection tube (3) and is amplified through an amplifier (10) to obtain neutron and gamma information; after secondary particles enter the Cherenkov radiation body, only e+ / e- generates Cherenkov light, and the Cherenkov light is amplified through a second photoelectric multiplier tube to obtain gamma information; two signals are subjected to subtraction to obtain neutron flux information. According to the device, the n and gamma signals are judged in combination with the pulse rise time difference, so that the measurement precision of the pulsed neutron flux is further improved.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Method for detecting radiation, device thereof, and positron emission tomography scanner
InactiveUS20110001049A1High measurement accuracyResolution timeMaterial analysis by optical meansTomographyScintillatorElectron
A light receiver for detecting incident time is installed on the side of a radiation source of a scintillator (including a Cherenkov radiation emitter), and information (energy, incident time, an incident position, etc.) on radiation made incident into the scintillator is obtained by the output of the light receiver. It is, thereby, possible to identify an incident position and others of radiation into the scintillator at high accuracy.
Owner:NAT INST FOR QUANTUM & RADIOLOGICAL SCI & TECH
Advanced cherenkov-based imaging systems, tools, and methods of feedback control, temporal control sequence image capture, and quantification in high resolution dose images
ActiveUS20200061391A1Simple, accurate, quick, robust, real-time, water-equivalent characterizationRapid and economic characterizationRadiation intensity measurementX-ray/gamma-ray/particle-irradiation therapyClinical settingsTherapy radiation
The present invention relates to advanced Cherenkov-based imaging systems, tools, and methods of feedback control, temporal control sequence image capture, and quantification in high resolution dose images. In particular, the present invention provides a system and method for simple, accurate, quick, robust, real-time, water-equivalent characterization of beams from LINACs and other systems producing external-therapy radiation for purposes including optimization, commissioning, routine quality auditing, R&D, and manufacture. The present invention also provides a system and method for rapid and economic characterization of complex radiation treatment plans prior to patient exposure. Further, the present invention also provides a system and method of economically detecting Cherenkov radiation emitted by tissue and other media in real-world clinical settings (e.g., settings illuminated by visible light).
Owner:DOSEOPTICS LLC
Tunable Cerenkov radiation source
InactiveCN102496678AOvercoming high voltageOvercome volumeThermoelectric devicesLow voltageRefractive index
A surface polaritons Cherenkov radiation source (SPCRS) belongs to an electromagnetic wave radiation source technology field. The radiation source comprises: an electron gun, a medium torus (or a medium cylinder) and a metal film layer deposited on an internal surface of the medium torus (or deposited on an external surface of the medium cylinder). An electron beam emitted from the electron gun is swept past from a metal film layer surface so as to excite a surface polaritons wave on the metal film layer surface. The surface polaritons wave penetrates the metal film layer and arrives at a medium material layer. When a ratio beta of a moving speed of the electron beam emitted by the electron gun to a light velocity in vacuum and a refractive index n of the medium material layer satisfy a Cerenkov radiation condition which is n beta>1, the surface polaritons wave is converted into the Cerenkov radiation in the medium material layer. A radiation frequency is determined by the frequency of the surface polaritons wave excited by the electron beam. Through changing moved electron energy, the frequency of the excited surface polaritons wave can be changed so as to tune the frequency of the electromagnetic radiation source. The radiation source of the invention has a small size, a narrow bandwidth and a low voltage, and is tunable and easy to be integrated.
Owner:UNIV OF ELECTRONIC SCI & TECH OF CHINA
Radiation dosage monitoring system
ActiveUS20160332000A1Shorten treatment timeIncreases radiation levelImage enhancementImage analysisRadiation DosagesMonitoring system
Some embodiments are directed to a radiation dosage monitoring system including a model generation module configured to generate a 3D surface model of a portion of a patient undergoing radiation treatment, an image detector configured to detect Cherenkov radiation and any subsequent secondary and scattered radiation originating due to the initial Cherenkov radiation emitted from the patient, a processing module configured to determine estimations of radiation applied to the patient utilizing the images from the image detector and the 3D model, and to utilize the determined estimations of radiation applied to the patient together with data indicative of the orientation of a radiation beam inducing emission of the Cherenkov radiation at a time when the radiation beam was applied to generate a 3D internal representation of the location of the portions of a irradiated patient resulting in the emission of the Cherenkov radiation.
Owner:VISION RT LTD
Method for tissue characterization based on beta radiation and coincident Cherenkov radiation of a radiotracer
InactiveUS20110250128A1Microbiological testing/measurementRadioactive preparation carriersRadioactive tracerTissue sample
A method of characterizing a tissue sample is provided that includes injecting a tissue sample with radiotracers, where the radiotracers include beta-emitter radio tracers, the beta-emitter radio tracers emit beta particles according to a decay of the beta-emitter radio tracers, and measuring the beta particles or Cherenkov radiation from the beta particles in the tissue sample, and determining a condition of the radio tracers in the tissue sample according to the measured beta particles or the measured Cherenkov radiation, where the determined condition includes a depth and / or a concentration of the radiotracers in the tissue sample.
Owner:THE BOARD OF TRUSTEES OF THE LELAND STANFORD JUNIOR UNIV
Radiation dosage monitoring system
Owner:VISION RT LTD
Optical Mode Conversion Using Intermodal Cherenkov Radiation
ActiveUS20130273240A1High optical densityOvercomes drawbackLaser detailsCladded optical fibreFiberAudio power amplifier
Embodiments of the present invention generally relate to laser combiners, and more specifically, to all-fiber devices that combine optical laser power from multiple separate sources such as lasers or amplifiers. In one embodiment, a method of manufacturing a combiner device comprises: positioning an plurality of fibers into a bundle of fibers; drawing the bundle of fibers to create a tapered section, the tapered section having a first outer diameter at an input end, a second outer diameter at an output end, and a taper ratio of at least three; wherein at least one of the fibers of the bundle of fibers comprises an optical waveguide configured for propagating an optical mode from the input end to the output end, and wherein a mode field diameter of the optical mode at the input end is substantially the same as the mode field diameter at the output end.
Owner:OFS FITEL LLC
Method for detecting radiation, device thereof, and positron emission tomography scanner
InactiveUS9029789B2High measurement accuracyResolution timeMaterial analysis by optical meansTomographyScintillatorElectron
A light receiver for detecting incident time is installed on the side of a radiation source of a scintillator (including a Cherenkov radiation emitter), and information (energy, incident time, an incident position, etc.) on radiation made incident into the scintillator is obtained by the output of the light receiver. It is, thereby, possible to identify an incident position and others of radiation into the scintillator at high accuracy.
Owner:NAT INST FOR QUANTUM & RADIOLOGICAL SCI & TECH
Cherenkov radiation device based on artificial surface plasmon
ActiveCN106486754AEasy to makeEasy to integrateRadiating elements structural formsAntennas earthing switches associationWaveguideStructure based
The invention discloses a Cherenkov radiation device design based on an artificial surface plasmon. The Cherenkov radiation device comprises a dielectric layer and two layers of metal sheets, wherein the two layers of metal sheets are fixedly connected with two sides of the dielectric layer and are in mirror symmetry along an extension direction of the metal sheets, the radiation device is of a structure based on dual layers of artificial surface plasmon waveguides, a periodic phase reverse structure is introduced into the waveguides, and thus, structural mutation with discontinuous impedance is generated in the structure. On the basis of the artificial surface plasmon waveguides, mode conversion and high-efficiency radiation of artificial surface plasmon are achieved, and moreover, the radiation and the beam direction of the artificial surface plasmon are effectively controlled by changing dispersion characteristics; by the Cherenkov radiation device, high-efficiency conversion between a conduction mode and a space radiation mode can be achieved, the development of a device and a functional device of a novel waveguide structure can be promoted to a great extent, and the Cherenkov radiation device has important application prospect in aspects of circuits, signal transmission, processing and the like in future.
Owner:SOUTHEAST UNIV
Device and method for measuring divergence angle distribution of electron beam
ActiveCN106970411AMeasurement accuracyImprove adjustment work efficiencyX/gamma/cosmic radiation measurmentDivergence angleParticle physics
Owner:INST OF FLUID PHYSICS CHINA ACAD OF ENG PHYSICS
Cherenkov infrared radiation source and free electron light source based on natural hyperbolic material
The invention provides a natural hyperbolic material-based Cherenkov infrared radiation source and free electron light source, which comprises a natural hyperbolic material layer and an on-chip free electron emission source, and the on-chip free electron emission source comprises an on-chip electron source cathode and an on-chip electron source anode. In this way, the on-chip free electron emission source generates a stable electron beam to excite infrared Cherenkov radiation in the natural hyperbolic material. As the natural hyperbolic material is low in cost, easy to obtain and simple in preparation process, the natural hyperbolic material has remarkable advantages compared with an artificial hyperbolic metamaterial. Meanwhile, the natural hyperbolic material is easy to grow, good in stability and few in defect, and the influence of the material processing technology precision on the device performance can be avoided. And on the basis of a natural dielectric material, the intrinsic loss is lower, so that the corresponding device is higher in radiation power, higher in efficiency and smaller in heat emission. In addition, based on a natural crystal material, layout and arraying are easy to realize, and a possible scheme is provided for a high-power array integrated free electron light source.
Owner:TSINGHUA UNIV
Design method of high power emitter based on catastrophic topological state
ActiveCN109543288AAchieve maximum extractionGuaranteed normal transmissionDesign optimisation/simulationSpecial data processing applicationsDielectricBoron nitride
A design method of a high power emitter based on a catastrophic topological state is disclosed. The composition and thickness of materials with different dielectric constants are designed by frequency, The output radiation characteristics of the device are designed at the topological mutation point of the material. The specific steps are as follows: S1, a radiation device structure supporting themutation topological state is designed, which is divided into three layers: graphene layer / boron nitride layer / metal aluminum layer, wherein the graphene layer is dielectric characteristic at the extreme ultraviolet ray, and the metal aluminum layer realizes the metal characteristic; S2, the thickness design of the radiation device structure; S3, the design of radiation field strength and electronflying distance. The direction of Cherenkov radiation wave vector of topological state mutation point is along the propagation direction, and the direction of energy flow of electromagnetic wave is perpendicular to the direction of wave vector, so that the maximum electron energy can be extracted. The invention realizes the high-power microwave radiation by utilizing the material topological state mutation; On the basis of using low electron energy to realize radiation, the high power output with adjustable narrow band is realized, and the design and development of the high power center frequency adjustable radiation chip is formed.
Owner:CHINA SHIP DEV & DESIGN CENT
Metamaterial slow wave structure unit based on Cherenkov radiation mechanism and slow wave structure
ActiveCN112751173AWith miniaturizationHigh coupling impedanceRadiating elements structural formsWave structureUniform field
The invention belongs to the crossing field of metamaterial and microwave source technology, and particularly relates to a Cherenkov-radiation-mechanism-based metamaterial slow wave structure unit and a metamaterial slow wave structure; the metamaterial slow wave structure unit comprise a hollow metal circular waveguide, a first metamaterial resonance unit and a second metamaterial resonance unit. The metamaterial slow wave structure unit has the following technical effects: the metamaterial slow wave structure unit can work under the cut-off frequency of the hollow circular waveguide with the same size, and has the advantage of miniaturization; high coupling impedance is achieved, and the effect beam wave interaction can be improved; the metamaterial slow wave structure unit has the advantage of uniform quasi TM01 mode field distribution, and the beam wave interaction efficiency can be improved through uniform field distribution; the electron beam can feel more conductor structures in the advancing process, the potential energy of the electron beam is reduced, and therefore the electron beam has larger kinetic energy, and the space limiting current is improved. The problem of structure edge field concentration caused by too thin thickness can be effectively solved, and the breakdown risk of the device is reduced; and meanwhile, a conductor part sensed by the electron beam is also added, so that the space limiting current can be improved.
Owner:NAT UNIV OF DEFENSE TECH
Apparatus and method for non-invasive inspection of solid bodies by muon imaging
ActiveUS10371855B2Non-invasive inspectionEfficient and cheapNuclear radiation detectionVolumetric Mass DensityNon invasive
Owner:INST NAT DI ASTROFISICA INAF
Radiotherapy position and dose real-time monitoring and positioning device and tumor radiotherapy system
ActiveCN111991710ANovel and clear research ideasRealize all-round real-time monitoringX-ray/gamma-ray/particle-irradiation therapyRadiologyNuclear medicine
The invention provides a radiotherapy position and dosage real-time monitoring and positioning device based on a CLI and structured light technology, and a tumor radiotherapy system in order to solvethe technical problems that the position of a Cherenkov radiation signal acquired by an existing tumor radiotherapy real-time monitoring synchronous acquisition device is possibly inconsistent with the position of a radiation target area, and the specific deviation position and causes cannot be positioned when a clinical deviation occurs. Three-dimensional body surface dose distribution of a patient is obtained in real time through three CLI cameras, three-dimensional body surface contour distribution of the patient is obtained in real time through three sets of position synchronous monitoringmodules, registration fusion of the three-dimensional body surface dose and the body surface contour is achieved through space coordinate transformation, and the accuracy of the radiotherapy dose andthe treatment position of the patient is monitored in real time. Once the position dose exceeds the clinical deviation, the accurate position of the dose deviation can be positioned, the deviation reason can be judged, and a basis is provided for adjusting the body position of the patient or the dose of an accelerator.
Owner:THE FIRST AFFILIATED HOSPITAL OF MEDICAL COLLEGE OF XIAN JIAOTONG UNIV
Radiation dose measuring method and device
InactiveCN111221021AEliminate noise interferenceReal-time measurementDosimetersNuclear technologyLight signal
The invention discloses a radiation dose measuring method and device, wherein the method comprises the steps of enabling a ray to respectively act with the probes of two optical fibers which are arranged side by side and are different in length, and generating the first Cherenkov radiation and the second Cherenkov radiation; transmitting a radiation signal to a sensor by the optical fibers; converting an optical signal into an electric signal and a digital signal in sequence; subtracting the digital signal of the first Cherenkov radiation from the digital signal of the second Cherenkov radiation by a computer to obtain a signal of a measurement area; and measuring the radiation dose according to the relationship between the Cherenkov radiation signal and the radiation dose. According to the invention, the rapid, accurate and real-time measurement of the radiation dose is realized, and the method and the device have an important value for the nuclear technology application, especially the medical application.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Method and system for measuring beam density distribution of high-current pulse electron beam
ActiveCN114047540AGuaranteed linear relationshipRealize beam density distribution measurementX/gamma/cosmic radiation measurmentImaging processingLight spot
The invention provides a method and a system for measuring the beam density distribution of a high-current pulse electron beam, and solves the problem that the beam density of a complete section of the high-current pulse electron beam cannot be measured by an existing beam measurement method. The method comprises the following steps of: 1, manufacturing a Cherenkov radiation conversion target; 2, establishing a measurement system; 3, collecting a light spot image; 4, obtaining the relative intensity distribution of Cherenkov radiation through the gray value distribution of the light spot image; and 5, acquiring beam density distribution. According to the method, the design process of the Cherenkov radiation rotating target is given, so that a basis is provided for realizing beam density distribution measurement. Meanwhile, the method provides a beam spot image processing method, gray value distribution of the beam spot image is converted into beam density distribution through the method, and therefore beam density distribution measurement on the complete section of the high-current pulse electron beam is achieved.
Owner:NORTHWEST INST OF NUCLEAR TECH
Cherenkov radiation detection device and method
InactiveCN109683189ACherenkov photon numberMany photonsRadiation intensity measurementLow demandDetector array
The invention relates to a Cherenkov radiation detection device and method. After ejecting proton nuclides, positive electrons will move for a time period before annihilation, and in the prior art, anexisting detector cannot read position information and energy information of a Cherenkov event accurately. The Cherenkov radiation detection device comprises a photoelectric detector module, a multi-case time coincidence module and a Cherenkov even estimation module. The Cherenkov radiation detection method includes the steps that by placing a photoelectric detector array, the counts of Cherenkovphotons, emitted by charge particles, ejected to the detector module and time of all the counts is read; time coincidence is conducted on the read time; through relative positions of the photons in holes, the position where the Cherenkov event occurs is estimated. By the adoption of the Cherenkov radiation detection device and method, the spatial resolution and the imaging signal-to-noise ratio of a component can be improved effectively, and the Cherenkov radiation detection device and method are particularly suitable for living imaging, with the low demand for imaging depth, of plants and others.
Owner:NANCHANG UNIV
Cherenkov radiation detection method and apparatus
PendingCN106405618ACherenkov photon numberMany photonsRadiation intensity measurementPhotodetectorMulti event
Provided is a Cherenkov radiation detection method. The method comprises placing a photodetector array, reading the photon counting and each counting time of Cherenkov photons emitted by charged particles to a detector module; performing time coincidence on the read time; and estimating the occurring position of the Cherenkov event according to the relative position of the photon in a hole. Provided is a Cherenkov radiation detection apparatus including a photodetector module, a multi-event time coincidence module, and a Cherenkov event estimation module. The Cherenkov imaging method and apparatus can effectively improve the device space resolution and imaging signal to noise ratio, and are especially suitable for the imaging of plants or other living bodies having low imaging depth requirement.
Owner:NANJING RAYCAN INFORMATION TECH
Bispecific nano-micelle based on folic acid targeting and Cherenkov radiation response as well as preparation method and application thereof
ActiveCN111700862AImprove hydrophobicityStrong specificityOrganic active ingredientsPharmaceutical non-active ingredientsLocal radiotherapyFolate targeting
The invention discloses a bispecific nano-micelle based on folic acid targeting and Cherenkov radiation response as well as a preparation method and application thereof, and belongs to the technical field of nano-material manufacturing and application. According to the invention, a photosensitive group nitrobenzyl is coupled with a hexadecyl DOX derivative (hydrophobicity is enhanced), the coupledproduct is embedded into a folic acid modified amphiphilic polymer (FA-PEG-PCL), the nano micelle NM / DOC is prepared, and the NM / DOC can utilize folic acid to target tumor cells. Furthermore, in theX-ray local radiotherapy process, the X-ray radiation is uniform, the photosensitive group-nitrobenzyl is broken through generated Cerenkov radiation, the hydrophilicity of DOX is improved, drug release is triggered, radiotherapy and chemotherapy are organically integrated, the specificity of chemotherapy drug action is enhanced through active targeting and response drug release of NM / DOC, and thetoxic and side effects on the human body are greatly reduced.
Owner:XI AN JIAOTONG UNIV
Cerenkov radiation device, preparation method and method for extracting radiation
ActiveCN106569248BSlow flightReduce manufacturing costRadiation intensity measurementElectronHigh voltage
The invention discloses a Cerenkov radiation device and a manufacturing method thereof, and a radiation extraction method. The Cerenkov radiation device comprises a metal cycle nanometer slit structure, a hyperbolic metamaterial structure and an electron-emitting source, wherein the hyperbolic metamaterial structure is arranged on an upper surface of the metal cycle nanometer slit structure; the electron-emitting source is arranged on an upper surface of the hyperbolic metamaterial structure; and the electron-emitting source includes an anode, a cathode and a grid electrode. The Cerenkov radiation device does not need a high voltage. A characteristic that a phase velocity of light in the hyperbolic metamaterial structure can be reduced by several orders of magnitudes compared to a velocity in a traditional material is used so that a required electronic flight speed generated by Cerenkov radiation can be greatly reduced; and then production cost generated by the Cerenkov radiation device is decreased and safety performance is increased.
Owner:TSINGHUA UNIV
A device for generating Cerenkov radiation by surface plasmons
InactiveCN106770619BAchieve motivationMaterial analysis by electric/magnetic meansControl systemPhotonics
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Measurement method and device for AB-BNCT mixed radiation field dose distribution
ActiveCN111308535AAchieve screeningReal-time measurementDosimetersMeasurement by spectrometryNuclear engineeringFluorescence
The invention discloses a measurement method and device for AB-BNCT mixed radiation field dose distribution. The measurement method comprises the steps that neutrons act with an optical fiber array togenerate first radiological fluorescence, and gamma acts with the optical fiber array to generate second radiological fluorescence and Cherenkov radiation; the first radiological fluorescence, the second radiological fluorescence and the Cerenkov radiation are transmitted to the sensor along the optical fiber; the first radiological fluorescence, the second radiological fluorescence and the Cherenkov radiation are sequentially converted into an electric signal and a digital signal, and the electric signal and the digital signal are transmitted to a computer; obtaining digital signals of radiofluorescence and Cherenkov radiation respectively generated by neutrons and gamma radiation by utilizing the difference between the optical fiber array and the interaction between the neutrons and thegamma radiation; and rotating the optical fiber array to obtain the digital signals of the radiofluorescence and the Cherenkov radiation at different angles. According to the invention, discrimination and quick measurement of the mixed radiation field are realized, and the method has an important value for nuclear technology application, especially medical application.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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