39 results about "Pulsed radiation" patented technology

The invention discloses a method for selecting and triggering gamma instant radiation pulse events, and belongs to the technical field of nuclear radiation detection. The method comprises the following steps: carrying out normalization preprocessing on an original gamma pulse radiation time spectrum; s time-frequency transformation is carried out on the preprocessed data, and time-frequency features are extracted; optimizing parameters of the frequency threshold and the amplitude threshold after S time-frequency transformation by adopting a deep reinforcement learning model to obtain an optimal frequency threshold and an optimal amplitude threshold; performing filtering processing on the signal of the S time-frequency conversion result, and separating noise from an effective signal; and searching a pulse radiation event for the filtered signal by applying a morphology-based peak searching method, and positioning the position and the characteristic of a real gamma instant radiation pulse event. According to the method, time-frequency analysis is carried out through S time-frequency transformation, the problem that the frequency of an analysis window cannot be adjusted through short-time window Fourier transformation is solved, the method has better frequency resolution and phase retention characteristics, and gamma pulse signal characteristics can be represented more accurately.

The invention relates to a hundred-milliwatt high-power high-repetition-frequency terahertz strong source generating device at room temperature, belongs to the technical field of nonlinear optical frequency conversion, and solves the problems that the terahertz conversion rate is low and additional cooling equipment is needed in the prior art. The beam expanding lens group is used for carrying out light spot beam expanding on the femtosecond pumping laser until the diameter of a light spot is twice of the original diameter; the plane mirror group is used for guiding the pump laser after beam expansion; the first half-wave plate, the reflective diffraction grating, the gold reflector and the third ultrafast reflector are used for adjusting polarization and diffraction reflection; the 4-f telescope imaging lens group is used for reducing the spot diameter of the received pump laser and imaging the pump laser to the lithium niobate crystal; the lithium niobate crystal generates terahertz pulse radiation in the direction perpendicular to the wavefront; the terahertz collection module receives and focuses the terahertz pulse radiation; and the measuring device is used for receiving the focused terahertz pulse radiation for measurement.

The invention discloses an accurate X-ray radiation dose measurement system based on artificial intelligence, which comprises the following steps: acquiring CT image data of a patient and pulse irradiation parameters of radiotherapy equipment through terminal equipment, and calculating a patient specific anatomical structure dynamic influence factor set, a pulse waveform time domain characteristic factor and a tissue interface scattering correction factor; all the parameters are substituted into a dose measurement formula to obtain an accurate X-ray radiation dose value; through a deep fusion image recognition technology (such as a high-resolution anatomical structure, tissue density gradient and heterogeneous region distribution provided by CT / MRI), a secondary particle scattering effect of a junction region of a tumor and a normal tissue can be accurately represented; and dynamic anatomical information (such as respiratory movement and organ displacement) in the image is combined to correct the time characteristic (such as dynamic change under an instantaneous high dose rate) of the pulse radiation field in real time, so that the dose calculation accuracy of a fast algorithm in a complex scene is remarkably improved.

The invention discloses a biplane tapered slot antenna, and belongs to the technical field of antennas. The antenna comprises a dielectric substrate, a metal radiation patch, a metal conduction band and a resistor. The radiation patch is arranged in a double-plane manner, so that the different-plane tapered slot line is constructed, and the impedance matching of the antenna is improved while the power capacity is improved. The metal radiation patch comprises an upper radiation patch and a lower radiation patch, the metal conduction band and the lower radiation patch form a microstrip line, and the resistor, the upper radiation patch and the lower radiation patch are connected in series into a whole, so that the effective suppression of the reflection voltage of the antenna is realized; therefore, resistance loading does not affect the radiation efficiency of the antenna. Technical index parameters such as power capacity, reflection voltage and radiation efficiency are considered at the same time, a technical scheme with excellent comprehensive performance is provided for ultra-wideband microwave pulse radiation, and the ultra-wideband microwave pulse radiation model can be used as an antenna basic model.

The embodiment of the invention provides an image acquisition method and system. The image acquisition method comprises the following steps: acquiring imaging pulse sequence information for a to-be-detected object; in a background scanning state, synchronously analyzing scanned image data to determine a synchronous starting moment with the pulse-type ray source; predicting the arrival time of at least one imaging pulse in the to-be-transmitted imaging pulse sequence according to the synchronous starting time and the imaging pulse sequence information; before the arrival time, controlling the detector to switch from the background scanning state to an integration state so as to receive the at least one imaging pulse; and in response to completion of reception of the at least one imaging pulse, executing an image reading operation to read an image corresponding to the at least one imaging pulse. According to the embodiment of the invention, a synchronous physical synchronization cable is omitted, the system cost and the integration difficulty are reduced, and the method is particularly suitable for a nondestructive testing system of MV-level high-energy pulse X-rays.

The invention discloses a peak-valley segmentation multi-size self-adaptive peak searching method applied to collision light pulse radiation, relates to the field of light radiation measurement, and aims at the characteristics of peak structure size difference, asymmetric structure distribution and the like of collision light radiation signal data, based on a peak-valley segmentation region and in combination with a logarithmic normal distribution fitting algorithm. According to the method, adaptive extraction of characteristic quantities of peaks of different sizes is realized, and main existing areas of peak structures of different scales are adaptively traversed through screening of peaks and valleys, so that the calculation amount of signal data processing and peak influence area screening is reduced, the peak searching process efficiency of the peak structures of different sizes is improved, and the calculation cost and time are saved.

The invention relates to the technical field of spectral analysis, and discloses an injection molding machine template casting iron liquid spheroidization rate residual magnesium trace detection method, which comprises: ablating an iron liquid surface by exciting a pulse radiation unit to generate plasma, synchronously collecting signal intensities of a first wave band and a second wave band, determining a plasma transient energy level distribution parameter based on the ratio, monitoring a time domain evolution trajectory of the parameter, comparing the trajectory with a signal-to-noise ratio threshold value determined based on the background signal attenuation feature points, and triggering a gating window when the parameter reaches the threshold value to extract trace magnesium spectrum data and output an evaluation parameter; through deep correlation of energy level parameters and background attenuation characteristics, the problem of triggering time sequence drift caused by high-temperature melt surface background radiation step fluctuation is solved, covering of residual magnesium trace signals by noise random fluctuation is reduced, and detection stability under complex working conditions is ensured.

This invention discloses a high-power pulsed radiation source based on low-dimensional nanomaterials, belonging to the field of pulsed radiation sources. It includes an integrated base, a lamp head, and internal core functional units. The lamp head has an emission window, a fan-shaped lamp cover, and a cleaning rod. Through an operating ring linked to a gear ring, gears, and a worm gear structure, the opening and closing of the lamp cover and the cleaning of the window can be achieved synchronously. The sealed emission window can isolate dust and moisture. The power supply unit, pulse drive unit, low-dimensional nanomaterial emission module, and radiation control unit within the integrated base work collaboratively. The power supply unit provides dual-path power, the pulse drive unit transmits excitation signals and receives feedback, the emission module generates pulsed radiation, and the control unit achieves timing matching through a synchronization signal. This invention is easy to operate and maintain, ensuring both the cleanliness of the emission window and the safety of internal components, while also improving the stability and power of the pulsed radiation output, solving the problems of cumbersome maintenance and insufficient coordination in existing technologies.

The present disclosure relates to a method of applying a protective coating to a substrate, the method comprising applying a fluid coating composition on at least a portion of a surface of the substrate by a precise application substantially without overspray, and applying pulsed infrared radiation to form a cured coating. Further disclosed is a substrate coated by said method and the use of a coating composition for forming a protective coating on at least a portion of a substrate by curing the applied composition by pulsed infrared radiation. The present disclosure is particularly useful for protecting a paint surface of a vehicle from stone hit.

The present invention discloses a high-efficiency waste incinerator flue gas treatment process in the field of industrial flue gas purification, comprising the following steps: S1, first introducing hot nitrogen to activate the adsorption bed, spraying a circulating liquid with a pH of 8.5-9.0 through a pre-cooling tower, and then entering the treatment process after the flue gas temperature stabilizes at 175-185°C. The adsorption bed comprises 20 layers of stainless steel wire mesh filled with SNPC material, equipped with an observation window and a pneumatic vibrator. S2, the flue gas is rapidly cooled from 300°C to 80°C by a vortex generator in the pre-cooling tower before entering the adsorption bed. Regeneration is automatically triggered when the dioxin concentration exceeds 1.0ng TEQ / m³. S3, closing the adsorption bed valve and performing microwave pulse radiation regeneration under nitrogen protection. Regeneration is completed when the exhaust CO2 concentration is less than 100ppm, and the adsorption material is cooled to 60°C before being recycled. The present invention uses process synergy to treat flue gas pollutants, improve the removal efficiency of dioxins and heavy metals, and simultaneously achieve the recycling of adsorption materials.

The application discloses a kind of super wide band electromagnetic radiation environment field uniform area fast estimation method, belong to electromagnetic field and microwave technical field, to solve the technical problem that present super wide band electromagnetic environment field uniform area calculation method is long in time, cost is high, workload is big, not suitable for the technical problem of fast application in experimental site.The method takes the radiation aperture area of super wide band pulse radiation system and the time parameter of excitation pulse waveform as input, realizes the fast estimation to the 3dB field uniform area and boundary of super wide band electromagnetic radiation environment by the calculation method obtained based on aperture radiation theory.The application can quickly determine the super wide band electromagnetic irradiation uniform area in experimental site without complex numerical calculation or experiment, provide reference for electronic information system electromagnetic vulnerability experiment layout, electromagnetic safety area division and the like, and then improve the efficiency of field experiment.The method can also help the design, engineering application and performance evaluation of super wide band pulse radiation system.

The invention discloses a refraction type pulse radiation detector based on multi-wavelength compensation and a dynamic range expansion method thereof, and solves the problems that when ray pulse intensity input by an existing refraction type pulse radiation detector is high, a large phase difference is generated between signal light and reference light, an output signal of an interferometer is reduced when reaching a certain value, and the dynamic range of the refraction type pulse radiation detector is influenced. The problem that the measurement dynamic range of the refraction type pulse radiation detector is limited due to the fact that the external output is not increased continuously is solved. The number of paths of probe light is reasonably designed, a plurality of interferometers with complementary linear intervals can be obtained, the dynamic range limitation of a single-path interferometer is broken through, the dynamic range of the refraction type pulse radiation detector is effectively expanded, meanwhile, the advantages of the single-path refraction interferometer are reserved, namely, the picosecond-order intrinsic time resolution is achieved, and the detection precision is improved. Meanwhile, pulse signals can be transmitted remotely, the front end is full-optical, and the anti-electromagnetic interference capability is high.

This invention discloses a time-division multiplexing system for power generation and controllable space electromagnetic pulse radiation based on a conductive tether, belonging to the field of aerospace electric tether technology. The invention uses a single retractable conductive tether as the core carrier and adopts a time-division multiplexing topology. A fully integrated radiation-resistant solid-state switch array within the cabin achieves physical-level electrical isolation and nanosecond-level disconnect-before-make switching between power generation and pulse radiation modes. The controllable space electromagnetic pulse radiation is actively excited high-energy pulse radiation, with high-energy nanosecond-level electromagnetic pulses actively injected through a pulse emission module, significantly increasing radiation power and possessing practical value for electromagnetic passivation of space debris. In power generation mode, the tether and space plasma form a closed loop to cut the geomagnetic field and generate electricity. In pulse radiation mode, the tether acts as an end-fed directional long-line antenna radiating electromagnetic pulses. Active sheath control stabilizes the sheath potential and suppresses losses. Radio frequency isolation achieves electrical decoupling between the cabin section and the radiation section, and the mode switching timing does not depend on the plasma's millisecond-level relaxation response, avoiding the risks of mutual exclusion and self-interference. This invention resolves the fundamental conflict between single-strand conductive tether power generation and pulsed radiation. It exhibits strong dynamic stability and meets electromagnetic compatibility standards. The core components are based on on-orbit verification technologies such as TSS-1R, PMG, and T-Rex, making it highly feasible for engineering applications. It can be applied to aerospace scenarios such as satellite on-orbit operation and maintenance and space debris management.

A dynamic multi-wavelength and sample voltage atom probe tomograph feedback control system includes a pulsed radiation source, an ion detector, a high voltage supply, and an analyzer. The pulsed radiation source produces first coherent light and second coherent light. The ion detector receives first emitted ions and second emitted ions from the atom probe sample. The high voltage supply produces a high voltage bias. The analyzer receives the ion signal from the ion detector and dynamically produces first pulsed radiation source control signal, second pulsed radiation source control signal, and high voltage bias control based on the ion signal. The system dynamically adjusts the optical wavelengths and sample voltage in real-time with atom probe tomography feedback by using the ion signal from the ion detector to dynamically produce first pulsed radiation source control signal, second pulsed radiation source control signal, and high voltage bias control.

The invention belongs to the technical field of radiation detection, and particularly relates to a wide-range pulse radiation sensitive radiation detection unit which comprises a Si-PIN detector (1) provided with an N-type end and a P-type end, the N-type end is connected with a bias power supply (2) and a charge sensitive pre-amplifier (4), the P-type end is connected with the input end of a current amplifier (5), and an operational amplifier is arranged in the current amplifier (5); and the bias power supply (2) is used for providing working bias voltage for the Si-PIN detector (1). According to the invention, a single Si-PIN detector is adopted to work in a pulse mode and a current mode at the same time, and the charge-sensitive pre-amplifier (4) and the current amplifier (5) are matched to complete measurement of pulse signals and current signals at the same time, so that integration and miniaturization of wide-range dose rate measurement and pulse radiation measurement units are realized; the use of Si-PIN detectors is significantly reduced, and the manufacturing cost is further reduced.

The invention discloses an efficient garbage incinerator flue gas treatment process in the field of industrial flue gas purification, which comprises the following steps: S1, firstly introducing hot nitrogen to activate an adsorption bed, spraying circulating liquid with the pH value of 8.5-9.0 by a precooling tower, and entering a treatment flow after the flue gas temperature is stabilized at 175-185 DEG C; wherein the adsorption bed is provided with 20 layers of stainless steel wire meshes filled with SNPC materials, and is provided with an observation window and a pneumatic vibrator; s2, the flue gas is rapidly cooled to 80 DEG C from 300 DEG C through a pre-cooling tower vortex generator and then enters an adsorption bed, and when the dioxin concentration is larger than 1.0 ng TEQ / m, regeneration is automatically triggered; and S3, closing the valve of the adsorption bed, performing microwave pulse radiation regeneration under the protection of nitrogen, completing regeneration when the CO2 concentration of the tail gas is less than 100 ppm, and cooling to 60 DEG C for recycling. According to the invention, flue gas pollutants are cooperatively treated through the process, the removal efficiency of dioxin and heavy metals is improved, and meanwhile, the cyclic utilization of an adsorption material is realized.

The invention relates to a photoelectric measuring device, a photoelectric measuring method and a machine readable carrier. The invention relates to an optoelectronic measuring device with a scanning function, comprising: a pulsed radiation source which generates a measuring beam from light pulses at a light pulse emission rate; a photodetector that detects the light pulse reflected from the target object; a control and analysis unit designed to be based on the number n gt; according to the invention, the measuring device is designed to measure a distance value from a respective scanning point of the target object according to the time-of-flight principle, and the control and analysis unit is designed to automatically set the number as a function of target object-dependent measured values determined in real time by the measuring device.

A method and apparatus for measuring the thickness of each layer of a tire tread or tire component, where the tire tread or tire component has conductive and non-conductive layers. One or more sensors are used that emit a beam or pulse of radiation that travels through one or more of the layers. The beam or pulse of radiation reflects off the surface of the layers and the interfaces and is received by a receiving device of the one or more sensors. The reflected beam or pulse of radiation is used to determine the thickness of each tread layer.

A substrate alignment measurement system comprising: an illumination source configured to provide a pulsed radiation beam comprising alternating s and p polarized radiation pulses; a first optical module configured to direct the pulsed radiation beam towards an alignment mark on a substrate; a second optical module configured to receive diffracted radiation from the alignment mark, the second optical module comprising a delay loop configured to provide temporally separated s and p polarized sub-pulses from each received pulse of the diffracted radiation; and a detection system configured to receive the s and p polarized sub-pulses from the second optical module and provide an output indicative of the intensity of each sub-pulse.

This invention relates to the field of materials physics testing technology and discloses a product defect detection method based on machine vision. The method includes: applying a single-pulse energy beam using a pulsed radiation source, acquiring a polarization image sequence of the material under test, and calculating the phase delay; dividing the sequence into a first sampling interval dominated by thermal conduction and a second sampling interval dominated by elastic relaxation; extracting the background deformation component in the second sampling interval, and differentially offsetting the phase delay in the first sampling interval to filter out macroscopic thermal expansion signals and obtain local defect feature fields, thereby identifying internal defects. This invention utilizes the physical parameters of the thermodynamic relaxation stage as a dynamic benchmark to solve the temporal aliasing problem between macroscopic deformation noise and microscopic thermal resistance signals under transient thermal excitation, achieving physical decoupling of subsurface micro-defect features and background stress, improving the signal-to-noise ratio of internal stress quantization, and ensuring the physical quantification accuracy of deep microcrack detection in semiconductor wafers.

The invention discloses a band-gap reference circuit with photocurrent compensation, which comprises a band-gap reference core and an error amplifier, and is characterized in that the band-gap reference core comprises a bias current mirror and band-gap reference geminate transistors; the output adjusting tube is connected with the output end of the error amplifier and is used for adjusting the output voltage according to the error gain output by the error amplifier; the resistance sampling circuit is connected with the output end of the output adjusting tube and is used for carrying out voltage division sampling on the output voltage and feeding back the sampled voltage to the error amplifier; and the light current compensating circuit is connected with the output end of the output adjusting tube and is used for forming light current under the strong X or gamma ray pulse radiation and compensating the output voltage. According to the band-gap reference circuit, the light current compensation circuit is utilized, compensation current can be generated from the voltage output end under strong X or gamma ray pulse radiation, so that output voltage disturbance generated by strong pulse radiation is compensated, and the output voltage of the band-gap reference circuit is stabilized in a strong pulse radiation interference environment.

The application discloses a kind of stripe camera system sensitivity under the measurement method and device of through radiation pulse, the calculation method of maximum ADUs value, solve the problem that stripe camera system sensitivity test precision is low in prior art, flexibility is poor and workload is big, specifically includes: step 1, build measurement system;Step 2, calculate conversion coefficient;Step 3, acquisition experimental image and dose monitoring value;Step 4, calculate sensitivity;The conversion coefficient calculation method of the present application is established from experimental radiation source pulse radiation dose to actual radiation source energy fluence, realizes the ability of using the measurement result under experimental radiation source to calculate stripe camera system sensitivity under actual radiation source radiation, fills the vacancy that stripe camera system sensitivity cannot be accurately measured under the current through radiation pulse, in the case where actual radiation source does not have stripe camera system calibration condition, ensure that stripe camera system is efficiently implemented scientific research exploration experiment.

The application discloses a system for rapidly identifying artificial radiation, and relates to the technical field of nuclear radiation protection. The system comprises an organic scintillator, a photomultiplier, a threshold comparison circuit and a processing module. The organic scintillator is used for absorbing gamma rays of a current environment and emitting photons when excited atoms and molecules are de-excited. The photomultiplier is used for converting the emitted photons into electric pulse signals. The threshold comparison circuit is used for comparing the amplified electric pulse signals with four voltage thresholds respectively through four comparators to obtain four count rates. The processing module is used for obtaining count rates between different voltage thresholds according to the four count rates, and obtaining corresponding weights according to the count rates between the different voltage thresholds. The absolute values of the differences between the multiple weights and a pulse radiation distribution characteristic factor in a natural background radiation environment are summed to obtain a summation result. Whether artificial radiation exists is determined according to the summation result. Through the multi-threshold pulse counting and weight distribution analysis method, whether an artificial radiation source exists can be rapidly judged within 100 ms.

Examples described herein generally relate to apparatus and methods for rapid thermal processing (RTP) of a substrate. The present disclosure discloses pulsed radiation sources used to measure a broad range of low to high temperatures in the RTP chamber, each at a discrete wavelength, are used at a low temperature regime before using one laser at a discrete wavelength for higher temperatures. In another example, a single laser is used for both the low temperature regime and higher temperatures. These methods are useful for detection of a broad range of low to high temperatures in the RTP chamber with varying substrate types.

The invention particularly relates to a system and a method for obtaining radiation pulse response, and solves the technical problems that the accuracy is low when the radiation pulse response is calculated, the experiment time for actually measuring the radiation pulse response of a streak camera system is long, and parameters are difficult to accurately obtain in the prior art. Compared with the prior art, the system for obtaining the radiation pulse response has the advantages that the relative uncertainty of the obtained radiation pulse response is less than 100%, the experiment time of actually measuring the radiation pulse response of the streak camera system is greatly reduced, and the experiment time can be reduced by about 50% at most. The method provided by the invention can be used for estimating the radiation pulse response of the streak camera system, and the test result can be compared with the response obtained on the pulse radiation source for mutual reference, so that the reliability of the test result is improved.

The invention discloses an electronic personal dosimeter applied to a medical intervention pulse radiation field, and relates to the field of medical radiation monitoring, and the electronic personal dosimeter comprises an instantaneous-accumulation dual-channel detector, an ADC, a main controller and a segment code screen; the detector is arranged in the medical intervention pulse radiation field, is connected with the ADC and is used for simultaneously collecting transient response current and accumulated integral charge of the medical intervention pulse radiation field; the ADC is connected with the SPI end of the main controller; the LCD end of the main controller is connected with the segment code screen; the transient response current and the accumulated integral charge of the radiation field are synchronously collected through the detector and are converted into digital signals through the ADC, and after the radiation dose rate and the radiation accumulated dose are calculated by the main controller, the radiation dose rate and the radiation accumulated dose are displayed in real time through the segment code screen. The radiation dose rate and the radiation accumulated dose of the detector can be synchronously monitored in real time in a small size by adopting a dual-channel combination mode, the power consumption is reduced, and the portability and the environmental adaptability of the dosimeter are improved.

The invention relates to a high-power short-pulse ray source phase control synchronization system and method, relates to the technical field of X-ray detection, and solves the technical problems of motion blur, insufficient ray power and inaccurate synchronization control caused by continuous exposure in the prior art. The system comprises an upper computer, a phase control time sequence unit, a motion machine, a pulse X-ray source, a digital flat panel detector, an image processing module and an image output module. According to the high-power short-pulse radiation source phase control synchronization system and method disclosed by the invention, non-fuzzy and high-resolution online detection of a thick-wall large piece on a high-speed assembly line is realized for the first time. Through time, pulse and image quality three-closed-loop control, the detection precision and stability are remarkably improved, and a system-level solution capable of being popularized is provided for modern industrial nondestructive detection.

An apparatus for measuring properties of an object comprises: an illumination system; a detector; and a processor. The illumination system is configured to emit pulsed radiation and direct the pulsed radiation to a beam spot region. The pulses of the pulsed radiation are chirped such that a wavelength of each pulse varies with temporal position in the pulse. There may be a fixed relationship between the phase of each wavelength component from different pulses (for example the pulses are formed by a mode-locked laser). The detector is arranged to receive a scattered portion of the pulsed radiation scattered from an object disposed in the beam spot region. The processor is operable to determine at least one beat frequency of radiation received by the detector and to determine one or more properties of the object (e.g. a thickness of a layer of the object) from said at least one beat frequency.