65 results about "Background radiation" patented technology

The invention relates to the technical field of gas detection, and relates to an optimization method and system for SF6 gas detection in a multi-temperature environment, and the optimization method comprises the steps: obtaining dual-band infrared images of a scene to be detected at the same time, the dual-band infrared images comprising a detection band infrared image and a reference band infrared image; preprocessing the dual-band infrared image; performing registration processing on the preprocessed dual-band infrared image; performing differential operation on the registered dual-band infrared image to obtain a differential image; and determining a dynamic segmentation threshold according to the current environment temperature, and performing threshold segmentation on the differential image according to the dynamic segmentation threshold so as to identify the SF6 gas leakage area. According to the optimization method and the optimization system, the dynamic segmentation threshold value is determined according to the current environment temperature, the problem that the detection performance of a fixed threshold value is reduced due to background radiation changes at different environment temperatures can be solved, and stable and reliable detection sensitivity can be kept within a wide temperature range.

The invention discloses a hydraulic concrete structure underwater surface crack detection method, and relates to the technical field of image sensors, and the method comprises the steps: carrying out the transmissivity mapping and background radiation field separation of underwater light field characterization parameters, generating a target reflectivity image, carrying out the multispectral-polarization data fusion of the target reflectivity image, and generating an enhanced feature image; performing multi-scale convolution kernel space transformation and feature pyramid fusion on the enhanced feature image to generate a crack response diagram, and performing anisotropic non-maximum suppression and morphological skeleton refinement on the crack response diagram to generate crack detection data; and performing geometric topology joint optimization and parameter quantification on the crack detection data, and outputting a structured detection report. According to the invention, by constructing the light field transmission model and synchronously carrying out polarization and depolarization ratio combined noise filtering and geometric distortion correction, adaptive noise filtering is realized, and the measurement precision is improved.

Method (100) of optical spectroscopy for analyzing a sample using an optical spectrometer (10), comprising: Obtaining a sample spectrum (101) of the sample using the optical spectrometer; Obtaining a blank spectrum (102) using the optical spectrometer, wherein the blank spectrum includes structured background radiation that correlates with the sample spectrum; Determining a cross-correlation (103) of the sample spectrum and the blank spectrum; Generating a mapped blind spectrum (105) by mapping the blind spectrum onto the sample spectrum based on cross-correlation; and Subtracting the imaged blank spectrum from the sample spectrum to produce a background-corrected sample spectrum (106).

The invention provides a binocular infrared wide-area calorific value detection method based on distance and environmental background compensation, which comprises the following steps: acquiring a fused infrared radiation image and a visible light binocular image, and introducing an atmospheric transmissivity calculation mechanism based on an infrared radiation transmission physical model, pixel-by-pixel compensation is carried out on infrared radiation attenuation of different distances and environment conditions; the infrared radiation image is subjected to background segmentation, an environment background area of a non-heat source target is extracted, an environment background radiation field covering a monitoring range is reconstructed, and a radiation correction value of the surface of the heat source target is calculated according to the atmospheric transmissivity, the environment background radiation field and a radiation value of a pixel corresponding to the heat source target in the infrared radiation image. Therefore, the actually measured temperature is obtained. According to the method, differentiated distance compensation and environment compensation can be carried out on wide-area and multi-target scenes, temperature measurement errors under complex environment conditions are effectively reduced, and the accuracy and stability of infrared heat value detection in wide-range monitoring application are remarkably improved.

Various systems and computer-implemented methods for background radiation based attenuation correction are disclosed. Nuclear scan data including scan data associated with a first imaging modality and background radiation data are received. An initial background radiation attenuation map is generated and provided to a trained model configured to generate a final background radiation based attenuation map from the initial background radiation attenuation map. Attenuation correction of the scan data associated with the first imaging modality is performed based on the background radiation based attenuation map and a nuclear image is reconstructed from attenuation corrected scan data associated with the first imaging modality.

FIELD: measuring equipment.SUBSTANCE: invention relates to a device for determining wind parameters. The wind parameter determinator comprises a control and signal processing unit (1), as well as an optical-electronic module (2). The control and signal processing unit (1) includes an analogue-to-digital converter (13) and a module (14) for calculating correlation functions between signals. The optical-electronic module (2) includes three photodetectors (8) with signal amplification units (11), amplitude detection units (12), as well as an optical system (4) with a variable focal length, a diaphragm unit (7), an amplitude modulator (5) of the intensity of the background radiation flux with a reference modulation frequency.EFFECT: increase in the sensitivity of the device.1 cl, 1 dwg

The application relates to a kind of double-band based infrared image blind cell compensation methods, belong to double-band infrared image processing technical field.The method includes: the double-band infrared image of input X i ( i , j )、 Y i ( i , j ) respectively carry out blind cell detection;Edge extraction is carried out to the double-band infrared image, and edge image Ex i , j 、 Ey i , j ;According to the detection condition and extraction condition, the pixel condition of the double-band infrared image is classified, and the image is output after the pixel is compensated according to the classification condition.The application method can improve the accuracy of blind cell detection, improve the accuracy of blind cell compensation, and effectively improve the compensation effect of large blind cell area in the image by using the difference of double-band background radiation information.​​

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.

The invention discloses air conditioning equipment which comprises a sensing module, a first characteristic parameter acquisition module, a second characteristic parameter acquisition module, a target parameter acquisition module and a prediction module. Wherein the first characteristic parameter acquisition module is configured to acquire a dressing grade, a somatosensory wind speed and an indoor environment background radiation temperature of a tested human body target based on a thermal image; the second characteristic parameter acquisition module is configured to acquire the environment temperature and the environment humidity of the indoor environment; the target parameter acquisition module is configured to acquire combinations of target sensible temperature and sensible humidity of a tested human body, and an integer index is used for representing a target label of each combination; the prediction module is provided with a prediction model generated based on the dressing grade, the somatosensory wind speed, the background radiation temperature, the environment temperature, the environment humidity and the target label. The integer index corresponding to the maximum probability value output by the prediction model is used for outputting the human body target comfort degree category. When a small sample environment is dealt with, the air conditioning equipment provided by the invention can effectively reduce the over-fitting risk.

The invention discloses a system and a method for measuring celestial body radiation noise based on an idle channel of a GNSS (Global Navigation Satellite System) receiver, relates to the crossing field of satellite navigation and radio astronomy detection, fully utilizes the idle channel in the receiver, realizes function expansion through firmware and algorithm upgrading, and does not need to add radio frequency hardware. This means that the idle channel and the navigation channel share the same radio frequency link in the links of the antenna, the feeder line, the low noise amplifier, the down-conversion and the like, so that the noise measurement result is consistent with the real observation condition. The deep fusion of navigation and scientific detection is realized, the baseband output is converted into a real-time radio radiation detector through statistical analysis, and the time sequence data of the equivalent noise temperature of the antenna can be continuously acquired. The data can be directly used for tasks such as sun storm monitoring, moon brightness temperature measurement, space background radiation change analysis and the like, and a real-time data source is provided for radio astronomy, space weather monitoring and planetary scientific detection.

The application discloses a titanium alloy component determination method and system based on a spectrometer, and comprises the following steps: focusing a first laser pulse on the surface of a titanium alloy sample to be measured to generate an initial excitation area; after a preset delay time after the action of the first laser pulse, a second laser pulse is applied to the initial excitation area; during the action of the second laser pulse, the spectrum signal emitted by the initial excitation area is collected in at least two different preset polarization analysis directions to obtain polarization-resolved spectrum data; a characteristic analysis signal of a target element is obtained; and the component content of each element in the titanium alloy sample to be measured is calculated according to the characteristic analysis signals of the target elements. The spectrum signal is collected in at least two different preset polarization analysis directions to obtain polarization-resolved spectrum data, and the response signal under a specific polarization direction combination is calculated to obtain a characteristic analysis signal, so that the isotropic background radiation and the spectral line interference of non-target elements are effectively suppressed from the physical principle.

The invention discloses a system and a method for dynamically visualizing a flow field in a high-energy laser damage process, and relates to the technical field of laser damage effect detection.The schlieren method is applied to dynamic visualization of the flow field in a high-energy laser and high-speed airflow coupling scene for the first time, and by means of the schlieren method principle, a coaxial point light source lamp serves as a light source, and the dynamic visualization of the flow field is realized. Light beams emitted by the point light source pass through the schlieren mirror to be focused to the knife edge position of the blade, when the light beams penetrate through a to-be-measured flow field area, the light beams deflect due to the gas density gradient, flow field imaging is achieved through the light beam deflection caused by the gas density gradient, the light beams are cut into light beams with bright and dark stripes through the blade, and the light beams are focused to the knife edge position of the blade. According to the technical scheme, the light beam deflection and light beam cutting process is optically isolated, and the background radiation of the high-energy laser and the target material combustion flame is inhibited through the light filtering module, so that the flow field structure and the flow field flow state are clearly captured and distinguished through optical isolation and spectral filtering under the strong wide-spectrum radiation generated by the high-energy laser and the combustion flame.

The invention discloses a spectrograph-based titanium alloy component determination method and system. The method comprises the following steps: focusing a first laser pulse to act on the surface of a titanium alloy sample to be detected to generate an initial excitation region; after a preset delay time after the first laser pulse acts, a second laser pulse acts on the initial excitation area; collecting spectral signals emitted by the initial excitation region in at least two different preset polarization analysis directions during the action period of the second laser pulse to obtain polarization resolution spectral data; obtaining a feature analysis signal of the target element; and according to the characteristic analysis signal of each target element, calculating to obtain the component content of each element in the titanium alloy sample to be detected. Spectral signals are collected in at least two different preset polarization analysis directions to obtain polarization resolution spectral data, and response signals of the polarization resolution spectral data in a specific polarization direction combination are calculated to obtain characteristic analysis signals, so that isotropic background radiation and spectral line interference of non-target elements are effectively inhibited from the physical principle.

A method of optical spectroscopy for analysing a sample using an optical spectrometer is provided. The method comprises obtaining a sample spectrum of the sample using the optical spectrometer and obtaining a blank spectrum using the optical spectrometer. The blank spectrum comprises structured background radiation which is correlated with the sample spectrum. A cross-correlation of the sample spectrum and the blank spectrum is determined. A mapped blank spectrum is generated by mapping the blank spectrum to the sample spectrum based on the cross-correlation, and the mapped blank spectrum is subtracted from the sample spectrum to generate a background corrected sample spectrum.

The present application relates to the technical field of building thermal test, solve the technical problem of low accuracy of the test of the building envelope performance due to the lack of sky background radiation cold effect in the prior art, provide a kind of coupling sky cold and hot radiation effect's building envelope performance test method and system, the method comprises: according to weather database, establish equivalent sky effective temperature control model;According to equivalent sky effective temperature control model, test environment parameter control module is obtained by testing environment parameter;According to testing environment parameter, the real-time test data of the building envelope test piece under the control of testing environment parameter is obtained by testing data acquisition module;Real-time test data is analyzed by testing data analysis module, and test result is obtained.The present application introduces controllable equivalent sky effective temperature model, effectively solves the problem of lack of sky background radiation cold effect in the prior art, and the deviation of test result and actual building service environment is large.

The invention discloses a preparation method of a broadleaf plant leaf imitating camouflage coating fabric. The problem of compatibility of hyper-spectrum and thermal infrared camouflage is solved through the design of a multi-layer composite structure. The fabric is composed of a base fabric layer, a high-reflection layer, a hyper-spectral camouflage layer and a low-emissivity layer, wherein the high-reflection layer compensates near-infrared band absorption and maintains vegetation spectral characteristics; the hyperspectral camouflage layer simulates a spectral curve of a broad-leaved plant leaf in a 400-2500nm wave band, the fitting degree reaches 0.95 or above, and the GJB 1411A-2015 primary standard is met; the low-emissivity layer realizes 8-14 [mu] m band thermal infrared low emissivity while visible light is highly transparent, and the temperature difference between the low-emissivity layer and plant background radiation in a daily period is less than 5 DEG C. According to the method, near-infrared absorption of the silver nanowires is counteracted through optical path cooperative regulation and control, unification of visible light-near infrared high-precision vegetation imitation and thermal infrared stable camouflage is achieved, the environmental stability is good, humidity and heat resistance, high and low temperature resistance and mold resistance are achieved, the 60-degree glossiness of visible light is smaller than or equal to 5, and the full-time camouflage requirement of a complex battlefield is met.

The invention provides an automatic angle ratio identification method and system of an optical fiber probe and an in-situ measurement device, and relates to the technical field of semiconductor detection.The method comprises the steps that an iris diaphragm of a light beam adjusting assembly is used for sampling light returned by the optical fiber probe according to a preset aperture sequence, an original data set is formed, and feature vectors are extracted; and matching with a pre-calibrated standard feature set in a database to output a target angle ratio. By adopting the scheme, automatic identification of the angle ratio can be realized under the condition that the hardware structure of the optical fiber probe is not changed; meanwhile, because the standard feature set is established under the unified preset calibration condition, the matching process has better robustness for the individual difference of the probe, thereby effectively reducing the risk of manual configuration and mismatching, improving the parameter consistency and measurement precision under the working condition of high-temperature strong background radiation, and improving the accuracy of measurement. And the universal adaptation capability of the in-situ measurement device to different probes is enhanced.

The present application belongs to the field of aviation / aerospace photoelectric remote sensing imaging detection technology, and particularly relates to a light and small common-aperture infrared / laser ranging integrated camera. During operation, infrared incident light sequentially passes through a first mirror surface, a third mirror surface, a second mirror surface and a beam splitter, and is then reflected onto an infrared receiving assembly. Incident laser light sequentially passes through the first mirror surface, the third mirror surface, the second mirror surface and the beam splitter along an optical path, and is then refracted onto a laser receiving assembly. The material of the annular multi-surface common main mirror, secondary mirror, main mirror barrel and secondary mirror seat is aluminum alloy, which is light in weight, high in strength and easy to process, and is beneficial to the manufacture and adjustment of the device, and is more conducive to the realization of athermalization design. The device still maintains good imaging quality or detection performance under a wide dynamic temperature environment of -150 DEG C to +80 DEG C, greatly reduces the volume of the device, realizes lightweight design of the system, solves the problems of low optical system transmittance and large optical-mechanical structure background radiation at high temperatures, and improves the detection performance of the system.

A method of estimating suppression of background radiation, by a target object, at an evaluation location, the method comprising: estimating a region of a field of view at the evaluation location which is occupied by the target object; and estimating a degree of suppression of background radiation at the evaluation location, by the target object, based on the region of the field of view at the evaluation location which is estimated to be occupied by the target object.

The invention relates to the technical field of nuclear radiation monitoring, in particular to a remote tritium on-line monitoring system, which comprises a data acquisition module for synchronously acquiring tail end tritium concentration, pipeline on-way environmental parameters and environmental background radiation data; the coupling model building module is used for building a gas-solid interface adsorption kinetics and fluid transportation coupling model and determining a dynamic transmission transfer function; the source item inversion reconstruction module is used for executing deconvolution operation and reversely deducing the real tritium concentration of a source end; the state evaluation and threshold adjustment module is used for calculating pipeline adsorption saturation in real time and dynamically adjusting an alarm threshold; the early warning generation module is used for generating an early leakage early warning instruction; the operation and maintenance prediction module is used for identifying pipeline maintenance requirements based on the adsorption performance decline trend; according to the invention, the defects of signal lag and peak smoothing are overcome, and second-level response to sudden pulse leakage is realized.

The invention provides a radiation control network node cooperative communication method and system, and relates to the technical field of computers, and the method comprises the steps: obtaining background radiation data in a target area and the original information content of to-be-sent data of each node; obtaining independent initial virtual radiation potential energy of each network node according to the background radiation data and the original information content; establishing a coupling relationship for all nodes according to the initial virtual radiation potential energy to obtain a continuous situation game field; obtaining a potential energy adjustment vector according to the continuous situation game field; deciding the transmitting state of the node according to the potential energy adjustment vector to obtain a transmitting spectrum form; the method comprises the following steps: performing closed-loop processing on a communication process according to an emission spectrum form, and iteratively updating historical background radiation data by taking a radiation state generated by actual emission as new environment feedback data until virtual radiation potential energy of a node does not change any more, so as to obtain a steady-state communication strategy enabling a network radiation mode to converge to a background.

The application provides a synthetic aperture radar image target detection method and device against complex interference, and relates to the technical field of remote sensing. The method comprises the following steps: acquiring a synthetic aperture radar (SAR) image to be detected; performing adaptive amplitude mapping on the SAR image to obtain a dark background radiation enhancement channel and a bright target radiation enhancement channel corresponding to the SAR image; performing coherent speckle noise suppression on the SAR image to obtain a coherent speckle noise suppression channel corresponding to the SAR image; performing channel fusion on the dark background radiation enhancement channel, the bright target radiation enhancement channel and the coherent speckle noise suppression channel to obtain a pseudo-color SAR image, and performing target detection based on the pseudo-color SAR image. By using the technical scheme provided in the application, the coherent speckle noise can be suppressed while the amplitude distribution of the SAR image is stabilized, so that the robust generalization capability of target detection is improved.

The application discloses a polarization remote sensor short-wave infrared band polarization calibration method based on background radiation correction, and the method comprises the following steps: constructing a polarization response measurement model and a background radiance model, and measuring a Stokes vector of target radiation; adopting a wave band method to determine a background radiation polarization response mathematical model caused by an internal system of a remote sensor; acquiring a background radiation measurement matrix by using a light source and a polarization polarization system; determining a correlation coefficient between external background radiation and internal background radiation to establish a background radiation polarization response mathematical model caused by internal background radiation; according to an actual operation state of the polarization remote sensor, an improved inversion model of a polarization degree based on background radiation correction is established; and a comparison measurement normalized deviation method is adopted to verify the correction effect of the background radiation polarization response. The application can effectively solve the problems of background radiation caused polarization remote sensor short-wave infrared band background noise increase and dynamic range drift, and improve the polarization measurement precision.

The application provides a radiation intensity calculation method and device for a space small target based on an infrared image. The method comprises the following steps: determining the center position and pixel space distribution range of the target based on the infrared image of the target; determining the initial radiation region of the target; performing expansion on the initial radiation region of the target, and performing expansion again on the first expansion region after expansion to obtain a second expansion region; generating a first background radiation template and a second background radiation template according to the initial radiation region of the target, the first expansion region and the second expansion region, and calculating a first target radiation intensity and a second target radiation intensity respectively; judging whether the difference between the first target radiation intensity and the second target radiation intensity is greater than a preset threshold value, if yes, taking the first expansion region as the initial radiation region and the second expansion region as the first expansion region to continue iteration, and if not, taking the average value of the two as the result output. The application can realize accurate calculation of the radiation intensity of a space small target.

The present disclosure is related to systems and methods for data masking. The method includes obtaining data associated with coincidence events related to intrinsic background radiations of a plurality of crystals of the PET device. Each of the coincidence events may be detected by two crystals of the plurality of crystals of the PET device. The data associated with the each coincidence event may include first time information and second time information. The method includes determining a first time of fight (TOF) difference corresponding to the each coincidence event based on the first time information and the second time information. The method includes determining a second TOF difference corresponding to the each coincidence event based on locations of the two crystals that detect the each coincidence event. The method includes correcting the PET device based on the first TOF difference and the second TOF difference.

The application provides a long-wave infrared spectral segment background radiation elimination method and system based on a long-wave infrared detector. First, all pixel dark background measured values of a certain frame number of the long-wave infrared detector and focal plane temperatures at corresponding moments are obtained. The relationship between the dark background measured values and the focal plane temperatures is fitted. Each pixel obtains a group of fitting coefficients. The dark background estimated values of the current frame of different pixels can be calculated through the fitting coefficients of each pixel and the real-time focal plane temperature. The dark background estimated values are removed from the incident signals, and the influence of the long-wave infrared system background radiation can be effectively eliminated. The above method and system build the relationship between the background radiation of all pixels and the focal plane temperature, calculate the dark background of different pixels from the nature of the background radiation, reduce the intermediate links, eliminate the influence of the non-uniformity of the dark pixels and the transmission error, effectively improve the calculation accuracy, and avoid wasting the detector resources caused by the artificial definition of the dark pixels.

The application discloses a kind of based on portable gamma spectrometer's energy spectrum data processing method and system, belong to nuclear radiation detection and energy spectrum analysis field.System contains detector, preamplification and analog-digital conversion, FPGA data processing, timing and display and storage module, signal acquisition and processing are completed cooperatively.Detector is converted into electric pulse by gamma ray, and digital data is obtained by amplification, analog-digital conversion;Effective signal is screened and channel is distributed by pulse determination and energy mapping, and energy spectrum is formed by statistics accumulation;By time normalization, eliminate acquisition time length difference, subtract ambient background by channel difference, reduce statistical noise by sliding average, finally output storage net energy spectrum data and related parameters.The application realizes ambient background real-time deduction and data whole-process real-time processing, weakens background radiation and statistical noise interference, improves measurement accuracy and comparability under portable scene, and is suitable for soil radioactivity investigation and other on-site detection.

The invention discloses a hydrophobic membrane, a preparation method of the hydrophobic membrane and a treatment method of high-salt radioactive wastewater. The hydrophobic membrane comprises a polymer, and the polymer comprises polyvinylidene fluoride; the hydrophobic membrane is a hydrophobic membrane subjected to CF4 plasma irradiation treatment. The hydrophobic membrane has high interception performance, the treatment method can achieve the volume minimization of radioactive waste, meanwhile, the purification liquid can reach the natural background radioactivity level, efficient treatment of salt-containing radioactive waste water is achieved, and the treatment method is simple and convenient to operate.

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.

The present application relates to the technical field of nuclear radiation, and discloses a nuclear medicine radioactivity purity online detection system based on energy spectrum analysis, which comprises a synchronous signal acquisition module, a real-time background suppression module for carrying out correlation screening on the gamma energy spectrum based on the environmental background radiation to obtain a background suppression energy spectrum of the nuclear medicine sample, a target peak shape extraction module, a dynamic response spectrum construction module for driving simulation of the target nuclide of the gamma energy spectrum based on the pure target peak spectrum and a preset detector response function to obtain a dynamic full response spectrum of the target nuclide, a dynamic spectrum contribution stripping module for carrying out contribution spectrum accurate stripping on the spectrum contribution of the target nuclide based on the background suppression energy spectrum and the dynamic full response spectrum to obtain a limit residual spectrum of the nuclear medicine sample, an impurity characteristic identification module and a radioactivity purity calculation module. The present application can improve the online detection efficiency of the nuclear medicine radioactivity purity based on energy spectrum analysis.