Patents
Literature
202 results about "Radiance" patented technology
Efficacy Topic
Property
Owner
Technical Advancement
Application Domain
Technology Topic
Technology Field Word
Patent Country/Region
Patent Type
Patent Status
Application Year
Inventor
In radiometry, radiance is the radiant flux emitted, reflected, transmitted or received by a given surface, per unit solid angle per unit projected area. Spectral radiance is the radiance of a surface per unit frequency or wavelength, depending on whether the spectrum is taken as a function of frequency or of wavelength. These are directional quantities. The SI unit of radiance is the watt per steradian per square metre (W·sr⁻¹·m⁻²), while that of spectral radiance in frequency is the watt per steradian per square metre per hertz (W·sr⁻¹·m⁻²·Hz⁻¹) and that of spectral radiance in wavelength is the watt per steradian per square metre, per metre (W·sr⁻¹·m⁻³)—commonly the watt per steradian per square metre per nanometre (W·sr⁻¹·m⁻²·nm⁻¹). The microflick is also used to measure spectral radiance in some fields. Radiance is used to characterize diffuse emission and reflection of electromagnetic radiation, or to quantify emission of neutrinos and other particles. Historically, radiance is called "intensity" and spectral radiance is called "specific intensity". Many fields still use this nomenclature. It is especially dominant in heat transfer, astrophysics and astronomy. "Intensity" has many other meanings in physics, with the most common being power per unit area.
Infrared imaging radiation correction method and system for gas leakage detection
The invention relates to the technical field of gas leakage detection, and discloses an infrared imaging radiation correction method and system for gas leakage detection, and the method comprises the steps: obtaining the distribution data of dark current noise, and the mapping relation parameters of an image gray value and a radiation brightness value; acquiring infrared radiation of the gas leakage scene by using an infrared detector to obtain an original infrared image; based on the distribution data of the dark current noise, performing pixel-by-pixel compensation on the original infrared image to generate an infrared image after dark current correction; extracting the radiation intensity distribution of the infrared image after dark current correction, calibrating the radiation value of each pixel in the infrared image based on the mapping relation parameter between the image gray value and the absolute radiation brightness value, converting the image gray value into the absolute radiation brightness value, and generating the infrared image after radiation calibration; and outputting an infrared image after radiometric calibration for subsequent gas leakage area identification and feature analysis. According to the invention, a high-quality and quantifiable radiation quantification image can be output.
Owner:STATE GRID SHANXI ELECTRIC POWER COMPANY TAIYUAN POWER SUPPLY COMPANY +1
Electronic component early fault detection method based on infrared thermal imaging
The invention discloses an electronic component early fault detection method based on infrared thermal imaging, and the method comprises the following steps: collecting an infrared thermal imaging image, synchronously collecting current and voltage data, and obtaining an infrared thermal imaging sequence; distortion correction, noise suppression and radiance correction are carried out on the sequence, and metal reflection false high-temperature points are removed; executing time sequence difference to extract a continuous heating area, and generating a time sequence temperature feature vector; inputting the feature vector into an improved Times Net model, and outputting time sequence feature representation; calculating a reconstruction error, a prediction residual error and a frequency spectrum deviation, and fusing into an abnormal score; comparing the abnormal score with a dynamic threshold value, and outputting an electronic component identifier, a potential fault type and an abnormal type; and an early fault trend report is generated by combining historical data comparison. The method realizes early detection and trend prediction of electronic component faults, and is suitable for state monitoring and reliability guarantee of a complex circuit system.
Owner:TIANJIN ZHENYU TECHNOLOGY CO LTD
Method for verifying Mars sky radiance simulation result based on Mars real-shot photos
The invention relates to a method for verifying a Mars sky radiance simulation result based on a Mars real-shot photo, and belongs to the technical field of Mars sky background radiance. Comprises: image acquisition; performing radiation calibration; correcting dark current; performing flat field correction; converting a radiation value; and geometric correction. The Mars sky radiance simulation method breaks through the dependence of an existing model on idealized hypothesis, performs dynamic verification by using actual shot image data, remarkably improves the authenticity and reliability of a Mars sky radiance simulation result, and effectively solves the problem of systematic deviation under a specific wave band; by constructing a complete process from image acquisition, radiation calibration, geometric modeling to brightness inversion and comparison verification, dynamic feedback and closed-loop correction of a theoretical radiation model are realized, model adaptability is improved, and fine modeling under multi-temporal and multi-meteorological conditions is supported; the method can be applied to an existing Mars rover navigation camera and an image processing link of the Mars rover navigation camera, does not need additional modification, has good engineering practicability and task compatibility, and is convenient to popularize and apply.
Owner:HARBIN INST OF TECH +1
Single-satellite target sight atmospheric refraction correction method and system based on multi-spectral range finding
ActiveCN121048573AAngle measurementNavigational calculation instrumentsSingle starSatellite observation
The invention discloses a single-satellite target sight atmospheric refraction correction method and system based on multi-spectral range finding, and relates to the field of atmospheric refraction processing, and the method comprises the steps: determining a target radiation intensity ratio based on two radiation intensities on different wavebands at the same moment; obtaining observation sight lines of the satellite on the measured target on different wave bands at the same moment, and carrying out light trace tracking to obtain a light ray tracking trajectory; determining a target grid through which each ray tracing trajectory passes from the atmosphere gridding model, determining an extinction coefficient of each target grid, and constructing a target function of a radiation intensity ratio with respect to the height of the target from the ground in combination with a radiation intensity calculation formula; determining a target height from the measured target to the ground based on a target function and a target radiation intensity ratio, determining the position of the measured target according to a track point matched with the target height in each light ray tracing track, and determining a sight line vector after atmospheric refraction correction by combining the position of a satellite, therefore, high-precision atmospheric refraction correction under a single-star observation condition is realized.
Owner:NAT UNIV OF DEFENSE TECH
Infrared bidirectional heat effect simulation method based on radiation intensity and GPU acceleration
ActiveCN121351443ADesign optimisation/simulationSpecial data processing applicationsConcurrent computationGlobal illumination
The invention discloses an infrared bidirectional thermal effect simulation method based on radiation and GPU acceleration, and belongs to the field of thermal radiation simulation and parallel computing. Dispersing the complex geometry into patch units, constructing an inter-patch radiation energy balance equation based on a radiance theory, and iteratively solving the final temperature of the patches through a radiance method; a three-level parallel strategy of a task level, a data level and an instruction level is designed, data intensive tasks such as shape factor calculation and radiance iteration are migrated to a GPU to be executed, data storage is optimized in combination with a structure array (SoA) layout and a sparse matrix compression technology, and efficient data sharing of a CPU end and a GPU end is achieved through a CUDA zero copy technology. According to the method, the dependence of a traditional method on regular grids is broken through, the calculation efficiency and precision of million-level surface patch heat radiation transmission in a complex scene are remarkably improved, and an efficient tool is provided for heat radiation indirect transmission calculation and a global illumination model in the field of three-dimensional scene infrared simulation.
Owner:ZHEJIANG UNIV
Ground photometer aerosol parameter inversion algorithm based on integrated machine learning
The invention discloses a ground photometer aerosol parameter inversion algorithm based on integrated machine learning. According to the method, a training data set for training an integrated machine learning model is obtained by adopting a forward radiation transmission simulation model, and the training data set is independent of an aerosol product of an existing algorithm and observation interfered by noise; the algorithm has good generalization ability and is excellent in performance after being used for real observation of a photometer, and inverted aerosol parameters have the ability of representing aerosol types; an aerosol inversion algorithm based on an integrated machine learning model is developed aiming at observation of a ground photometer, and the time for completing aerosol inversion for one time is at a millisecond level; the multi-band and multi-angle radiance observation can be utilized at the same time to invert aerosol parameters of multiple bands at a time; any prior hypothesis and smooth constraint are not needed during aerosol parameter inversion, inversion result loss caused by non-convergence of gradient descent in a numerical inversion algorithm is avoided to a certain extent, and waste of effective observation is reduced.
Owner:PEKING UNIV
Joint inversion method and system for surface temperature and emissivity, and medium
The invention relates to a land surface temperature and emissivity joint inversion method and system and a medium. The inversion method comprises the following steps: acquiring radiation brightness vectors observed by a satellite sensor in a plurality of thermal infrared bands as observation radiation brightness vectors; constructing a standard emissivity spectrum dictionary database as a dictionary matrix; defining a generation rule of the surface emissivity; establishing a forward physical model, and taking an analog value of the observed radiance vector as model output; defining a likelihood function of an observation radiance vector, defining sparsity prior probability distribution for the sparse coefficient vector, and defining uniform prior probability distribution for the surface temperature; joint posterior probability distribution of the surface temperature and the sparse coefficient vector is calculated, and multiple groups of samples are extracted; calculating a posteriori estimation value and an uncertainty interval of the surface temperature; and calculating a posteriori estimation vector of the sparse coefficient vector, and multiplying the posteriori estimation vector with the dictionary matrix to obtain a posteriori estimation value of the surface emissivity. The automation level of remote sensing information extraction and the information output efficiency are improved.
Owner:CHINA GEOLOGICAL SURVEY XIAN MINERAL RESOURCES SURVEY CENT
Calibration method for infrared temperature measuring device
The invention relates to the technical field of infrared temperature measurement, in particular to a calibration method for an infrared temperature measurement device, and the method comprises the steps: calculating a first spectral radiation quantity at a reference temperature and a second spectral radiation quantity at an ambient temperature; based on the first spectral radiation quantity and the second spectral radiation quantity, the spectral average emissivity of the target surface of the blackbody calibration source at the reference temperature is obtained, the third spectral radiation quantity of a calibration temperature reference value is obtained through calculation, reverse calculation is conducted on the third spectral radiation quantity, and the calibration temperature reference value is obtained; a response model is constructed based on a calibration temperature reference value, a gain coefficient and a bias coefficient are obtained by solving the response model, a gain value of the infrared temperature measuring device is corrected based on the gain coefficient, and a bias value of the infrared temperature measuring device is corrected based on system bias. The whole calibration process of the method is convenient and easy to operate.
Owner:WUHAN GUIDE SENSMART TECH CO LTD
Rotation and translation absolute calibration method based on nerve radiation field, medium and equipment
The invention relates to the technical field of optical precision measurement, in particular to a rotation and translation absolute calibration method based on a nerve radiation field, a medium and equipment. The method comprises the following steps: acquiring at least three groups of interference measurement data of a measured mirror under original, rotation and translation poses by using an interference measurement system to be calibrated, inputting pixel coordinates and position coding information in the data into a neural radiation field network, optimizing network parameters through a self-supervised training strategy, and completing calibration of a reference mirror surface shape. Compared with a traditional Zernike method, the scheme adopts a neural radiation field to construct a double-branch network, can adaptively learn complex surface shape space distribution, and improves medium-high frequency error separation precision; the error of the reference mirror and the measured mirror is synchronously and directly output by double branches without successive dependence, so that error transmission and accumulation are avoided; the self-supervised training mechanism implicitly compensates pose deviation and noise interference through redundancy constraint, and shows higher engineering robustness.
Owner:LEADING OPTICS (SHANGHAI) CO LTD
Systems and method to calibrate and measure fluorescence
PendingUS20260056126A1Radiation pyrometryRaman/scattering spectroscopyRadianceBroadband light source
A method and a system have been developed to calibrate the total spectral radiance factor (TSRF) obtained from different instruments. A broad-band light source covering the whole visible range as well as the fluorescence excitation wavelengths is used to measure the TSRF, and one or more narrow-band light sources outside of the fluorescent band is used to measure fluorescent spectral radiance factor (FSRF) separately. After that, the TSRF is adjusted by the FSRF, and a calibrated TSRF can be obtained. This can be applied to characterize Optical Brightening Agents (OBAs) as well as other fluorescent materials without requiring any moving part of the instrument to do the calibration.
Owner:DATACOLOR
Dry-farming oat growth vigor monitoring method and system based on hyperspectral remote sensing of unmanned aerial vehicle
The invention provides a dry-farming oat growth vigor monitoring method and system based on unmanned aerial vehicle hyperspectral remote sensing, and relates to the technical field of dry-farming oat growth vigor monitoring. The reflectivity of each image pixel under different spectral band conditions is calculated through the absolute radiation brightness and the known reflectivity of the reference plate, the average reflectivity of the unit grids in different spectral bands is obtained, a linear product is adopted to construct a growth score index, the growth score index of each grid unit is clustered by adopting a K-means clustering method, and the average reflectivity of each grid unit is calculated. And outputting the clustering condition of the growth vigor of the dry farming oats of the grid units, and setting a judgment threshold according to the clustering condition of the growth vigor of the dry farming oats to realize growth vigor classification. A reference plate is introduced to calibrate the reflectivity, the pixel-level absolute reflectivity is calculated through a radiation transfer equation, and the influence of illumination condition changes is eliminated; k-means clustering is adopted to automatically divide growth vigor levels, and a threshold value can be generated in a self-adaptive mode based on data distribution.
Owner:INNER MONGOLIA AUTONOMOUS REGION ACAD OF AGRI & ANIMAL HUSBANDRY SCI
Intermediate infrared hyperspectral emission and reflection characteristic integrated inversion method
ActiveCN121252970ARadiation pyrometryScattering properties measurementsMiddle infraredSpectral emission
The invention belongs to the technical field of quantitative remote sensing, and relates to a mid-infrared hyperspectral emission and reflection characteristic integrated inversion method, which comprises the following steps: acquiring mid-infrared hyperspectral satellite remote sensing data, and optimizing sensing entrance pupil radiance data to obtain optimized entrance pupil radiance data; the intermediate infrared hyperspectral satellite remote sensing data comprises sensing entrance pupil radiance data; performing atmospheric correction on the optimized entrance pupil radiance data by using a radiation transfer model to obtain surface brightness temperature and atmospheric downward radiation, and calculating solar irradiance reaching the surface; constructing a mid-infrared hyperspectral earth surface bi-directional reflectivity inversion framework, and performing earth surface bi-directional reflectivity inversion based on the mid-infrared hyperspectral earth surface bi-directional reflectivity inversion framework to obtain earth surface bi-directional reflectivity and earth surface equivalent radiance; constructing a scene self-adaptive framework, and performing inversion based on the scene self-adaptive framework to obtain the surface temperature and the surface emissivity; therefore, accurate separation of surface emission radiation and surface reflection radiation is completed.
Owner:INST OF GEOGRAPHICAL SCI & NATURAL RESOURCE RES CAS
Laser-driven white light source device
This invention relates to the field of laser special light source technology, and provides a laser-driven white light source device, which includes a laser source, an optical system, a gas-loaded structure, and a high-voltage driving component. The laser source is suitable for providing a laser beam; the optical system is suitable for focusing the laser beam; the gas-loaded structure is located on the side of the optical system away from the laser source, and the center of the gas-loaded structure corresponds to the focusing area of the laser beam; the high-voltage driving component is suitable for igniting plasma within the gas in the gas-loaded structure; wherein, the gas-loaded structure has a gas carrier incident surface and a gas carrier exit surface arranged opposite each other along the propagation path, and the curvature of the gas carrier incident surface and the gas carrier exit surface is constant in the direction perpendicular to the propagation path. This application can reduce the generation of aberrations, thereby reducing the size of the emitting point and resulting in better consistency of the emitting point; at the same time, the uniformity of white light output and the spectral radiance are also better.
Owner:HANGZHOU LANGDAO SHENGUANG TECHNOLOGY CO LTD
Enhanced water radiance sensor based on polarization filter
ActiveCN119085844BSpectrum investigationPhotometry using electric radiation detectorsMechanical engineeringOptical polarization
This invention relates to the field of water radiance measurement technology, and particularly to an enhanced water radiance sensor based on a polarizing filter. The sensor comprises a polarizing filter, a Kohler illumination system, a shaping fiber bundle, a spectrometer, and a host computer, arranged sequentially. The polarizing filter is positioned at a preset position at the front end of the optical path of the Kohler illumination system, which converts natural light from the water surface into a uniform and controllable light source. The incident end of the shaping fiber bundle is connected to the Kohler illumination system, and the exit end is connected to the spectrometer. The spectrometer is connected to the host computer. The water radiance passes sequentially through the polarizing filter, the Kohler illumination system, and the shaping fiber bundle before entering the spectrometer. The spectrometer converts the received optical signal into an electrical signal and transmits it to the host computer. The advantage of this invention is that by employing the Kohler illumination system, the field of view of the enhanced water radiance sensor is reduced to ±2°, solving the problem of poor glare suppression under large field of view in traditional sensors.
Owner:CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
Infrared scene quantitative radiance calculation method based on ray tracing module
The present application relates to a kind of infrared scene quantitative radiance calculation methods based on light ray tracking module, comprising: obtaining target mask information image, the radiance image of infrared scene, depth information image and position information image, sensor position information, sensor field of view and sensor observation direction;Infrared scene is divided into several view cones according to the resolution of target radiance area image, wherein several view cones and the object surface in infrared scene intersect to form several face elements;The radiance of each face element at the sensor is calculated by the theorem of solid angle projection;The radiance of several face elements at the sensor is accumulated, and the radiance of infrared scene to the sensor is obtained.The method supports full scene, single target, multiple targets as radiation energy source, and can be applied to high complex infrared scene simulation work;Without additional data support, the radiance at the sensor can be calculated without performing redundant work.
Owner:XIDIAN UNIV
Infrared radiation calibration method and device considering test distance, equipment and storage medium
PendingCN121977703AHigh precisionHigh measurement accuracyImage enhancementRadiation pyrometryBlack-body radiationRadiance
The invention discloses an infrared radiation calibration method and device considering a test distance, equipment and a storage medium. The method comprises the following steps: constructing an infrared radiation physical model considering the integral time of an infrared detector and the test distance of a target; and utilizing the training set and the coefficient learning network model to fit parameters in the infrared radiation physical model to obtain an optimal solution of the parameters, and applying the optimal solution to the infrared radiation physical model to complete infrared radiation calibration. According to the method, the influence of the test distance and the integral time on the relationship between the gray scale image and the radiation brightness is considered, so that the infrared radiation physical model is constructed, the accuracy of the radiation calibration result is improved, and the accuracy of the radiation calibration result is improved by utilizing the gray scale image under different test distance and integral time combinations. And parameters of the infrared radiation physical model are optimized by a training set consisting of the grey-scale maps and the black-body radiance corresponding to each grey-scale map, so that the infrared radiation physical model can set an optimal solution, and the measurement precision of the infrared radiation measurement system on the target radiance distribution is improved.
Owner:XIDIAN UNIV
Method and device for judging inland water flare of hyperspectral remote sensing image of unmanned aerial vehicle
The invention relates to the technical field of remote sensing image quality control, and discloses an unmanned aerial vehicle hyperspectral remote sensing image inland water flare judgment method and device, and the method comprises the steps: obtaining the wavelength data of each pixel point in a remote sensing image and the radiation brightness data corresponding to each wavelength data; determining a saturated flare characteristic wave band and an unsaturated flare characteristic wave band according to the spectral curve characteristics of each content in the remote sensing image; identifying saturated flare pixels and unsaturated flare pixels in the remote sensing image according to the wavelength data and the radiation brightness data of each pixel point in the saturated flare characteristic wave band and the unsaturated flare characteristic wave band; and judging whether the remote sensing image is available or not according to the positions and proportions of the saturated flare pixels and the unsaturated flare pixels relative to the focus region in the remote sensing image. According to the method, whether the content contained in the pixel is the flare pixel is judged according to the spectral curve characteristics of the pixel points in the remote sensing image, and then whether the remote sensing image is available is judged according to the position and proportion of the flare pixel in the focus region of interest.
Owner:SHANGHAI INVESTIGATION DESIGN & RES INST CO LTD
A high-resolution remote sensing scene three-dimensional radiance calculation method and application
ActiveCN120030857BConcurrent instruction executionDesign optimisation/simulationConcurrent computationThree-dimensional space
The application relates to the technical field of space remote sensing, and specifically provides a three-dimensional radiance calculation method and application of a high-resolution remote sensing scene. First, a surface cell grid of a three-dimensional space is created, spontaneous radiation of all triangular surface cells under sunlight irradiation is calculated, a traditional RGM model is improved, a plurality of threads of a GPU are used to perform parallel calculation of a visibility factor under an OpenACC parallel framework, a successive over-relaxation method is used to iteratively calculate radiation flux density of the surface cells, after the radiation flux density of each surface cell is obtained, bidirectional reflectivity BRF under different observation angles is calculated, efficient simulation of bidirectional reflectivity and radiation transmission of a complex scene is realized. The application significantly improves the calculation speed of an original RGM model, the calculation speed is improved by nearly 70 times through testing, and when a large-scale scene is simulated, ten million small surface pieces can be processed without sacrificing precision.
Owner:JILIN UNIVERSITY
Multiband intelligent radiation temperature control device
The invention provides a multiband intelligent radiation temperature control device, which realizes multiband intelligent radiation temperature control through innovative design, and is characterized in that a first micro-unit and a second micro-unit with different characteristic lengths are adopted in an optical functional layer, and according to an electromagnetic resonance theory, the first micro-unit with the long characteristic length is matched with a far infrared band wavelength, and the second micro-unit with the long characteristic length is matched with a far infrared band wavelength; the far infrared radiance can be modulated along with the change of the external temperature, and the second micro-unit with the short characteristic length is adaptive to a middle infrared band to realize corresponding radiance modulation; meanwhile, large-area temperature control uniformity is guaranteed through array arrangement of the modulation areas, and environment adaptability is enhanced through combination of the protection layer and the optical function layer. Compared with a traditional single-band temperature control device, the design breaks through band limitation, achieves mid-infrared and far-infrared dual-band cooperative regulation and control, can respond to environment temperature changes in real time, improves the temperature control precision and dynamic performance, and effectively solves the problems that in the prior art, temperature control is not accurate in a complex environment, and the application scene is single.
Owner:WUHAN XINGZHILENG TECHNOLOGY CO LTD
Infrared image adaptive atmospheric correction method and device based on radiation transfer model
The application discloses an infrared image adaptive atmospheric correction method and device based on a radiation transmission model, and belongs to the technical field of remote sensing image radiation correction. The method first extracts the spatial range, imaging time and observation geometry parameters of an image scene, constructs a scene-based atmospheric profile grid by distance inverse ratio weighted interpolation based on a reanalysis atmospheric profile, and combines a digital elevation model and a view zenith angle to correct and apply terrain and observation geometry constraints to generate control node input parameters. Then, the atmospheric radiation transmission model is called in batches to obtain the hyperspectral results of each control node, and the transmittance and path radiance parameters of the infrared target band are extracted by spectral response function convolution. Finally, the control node parameters are reprojected to the original image coordinates, the four-neighbor-domain bilinear interpolation and nine-neighbor-domain weighted interpolation results are adaptively fused for each pixel, the full-resolution atmospheric parameter field is recovered, and the observed radiance at the ground is inversed.
Owner:SHANGHAI INSTITUTE OF TECHNICAL PHYSICS CHINESE ACADEMY OF SCIENCES
Reflection wave band spectral domain influence uncertainty quantification method and device for reference star radiation reference transmission
PendingCN121298013ARadiation pyrometryDesign optimisation/simulationStandard uncertaintyReflected waves
The invention provides a reflection wave band spectrum domain influence uncertainty quantification method and device for reference star radiation reference transmission, and relates to the technical field of data processing, and the method comprises the steps: inputting ground features, atmosphere and observation geometric parameters into a radiation transmission model, and simulating to generate high-resolution atmosphere top spectrum radiance data as a real radiation spectrum; carrying out convolution on the data and a reference instrument spectral response function to obtain a reference instrument measurement spectrum; the reference instrument measurement spectrum and the real radiation spectrum are respectively convolved with the target instrument spectral response function, the relative difference percentage is calculated, the root mean square is taken, and a first standard uncertainty is obtained; positive and negative deviation is applied to the central wavelength of the reference instrument, and a wavelength sensitivity coefficient is obtained through calculation and normalization; the variance is synthesized into related parameters to obtain the total standard uncertainty, then the coverage factors are fused, and the expansion uncertainty is output. The accuracy of the quantification result is improved.
Owner:NAT SATELLITE METEOROLOGICAL CENT +1
Dynamic Range Extraction and Analysis Method for Damaged Geomorphic Features in Mining Areas
This invention relates to the field of image analysis technology, and more specifically, to a method for extracting and analyzing the dynamic range of images of damaged landforms in mining areas. The method includes: Step 1: Integrating the multispectral radiance within a set wavelength range, while subtracting two atmospheric scattering terms at each wavelength point to obtain the corrected reflectance; Step 2: Multiplying the Euclidean distance by the curvature amplitude in the near-infrared band to obtain a spectral collapse-curvature index sensitive to browning / chlorosis; Step 3: Calculating the peak elastic strain energy density per unit area of overburden-coal mass; Step 4: Extracting all linear cracks from remote sensing images of the same time period and statistically analyzing their orientation histograms, then using the Shannon entropy formula to calculate the anisotropic entropy modulation of the cracks, thereby constructing a comprehensive dynamic range damage index to characterize the degree of damage to each pixel. This invention achieves accurate identification and intensity classification of surface damage areas under mining disturbance in mining areas.
Owner:山东省国土空间生态修复中心(山东省地质灾害防治技术指导中心山东省土地储备中心)
Temperature measurement system, standardized temperature calculation device, and temperature measurement method
To provide a temperature measurement system capable of acquiring a standardized temperature of a combustion chamber used for temperature control of a coke oven.SOLUTION: A temperature measurement system comprises: a two-color radiation thermometer that measures a temperature of a flue constituting a combustion chamber based on a ratio of spectral radiances at two different wavelengths acquired through an optical window provided in an observation hole above the combustion chamber of a coke oven; and a standardized temperature calculation device that calculates a standardized temperature of the combustion chamber. The standardized temperature calculation device includes: a measurement target identification unit that identifies the combustion chamber including the flue to be measured based on a measurement position by the two-color radiation thermometer; and a standardized temperature calculation unit that calculates the standardized temperature from a combustion switching time of the flue to be measured, a temperature of the flue measured by the two-color radiation thermometer, and a measurement time, using a temperature change formula representing a temperature of the flue that changes with time during combustion switching for switching over between a combustion-side flue and an exhaust-side flue of the combustion chamber, the temperature change formula being acquired in advance.SELECTED DRAWING: Figure 3
Owner:NIPPON STEEL CORPORATION
Rapid Calculation Method for Rear Infrared Radiation Intensity of S-Bend Nozzle
ActiveCN116842863BAvoid solution dependenciesquick calculationDesign optimisation/simulationComplex mathematical operationsFt ir spectraSpectral transmittance
This invention discloses a rapid calculation method for the rearward infrared radiation intensity of an S-curve nozzle, belonging to the field of infrared radiation characteristic simulation of aero-engine exhaust systems. The method comprises the following steps: determining the design parameters of the S-curve nozzle and exhaust mixer components; establishing projection models of the key shielding sections of the exhaust mixer and S-curve nozzle; calculating the projected area of each component after shielding by the S-curve nozzle using an image method; calculating the flow field parameter distribution and component surface temperature of the S-curve nozzle; calculating the axial length and volume of the visible region of the exhaust gas in the S-curve nozzle; calculating the spectral transmittance and spectral radiance of the exhaust gas along the nozzle outlet centerline within the visible region of the exhaust gas, as well as the spectral radiance intensity of the exhaust gas; calculating the infrared spectral radiance intensity of the wall surface; and integrating the spectral radiance to obtain the total infrared radiation intensity. This method solves the problems of existing technologies where the simulation calculation of the infrared radiation characteristics of S-curve nozzles is complex and time-consuming, and rapid calculation methods are only applicable to axisymmetric nozzles and cannot simulate the shielding structural characteristics of S-curve nozzles.
Owner:NORTHWESTERN POLYTECHNICAL UNIV
Satellite radiance data deviation correction method and system based on constraint optimization
The invention discloses a satellite radiance data deviation correction method and system based on constraint optimization, and the method comprises the steps: obtaining satellite radiance observation data and a corresponding numerical mode background field simulation value, and constructing an observation background field subtraction data set; based on unbiased reference observation in combination with a Jacobian matrix of a radiation transmission mode, separating a numerical forecasting mode deviation from an observation deviation, estimating a prior deviation value of each satellite instrument channel, and constructing a configurable forecasting factor set; the forecasting factor set comprises an air mass dependence forecasting factor, a scanning position polynomial fitting factor and a scanning angle polynomial fitting factor; on the basis of basic quality control, statistical anomaly observation is eliminated by applying a double-weight robust estimation method, and a target function based on prior constraints is constructed; and controlling the relative weight of the observation fitting item and the prior constraint item through regularization parameters, obtaining an optimal deviation correction coefficient by solving a linear equation set, outputting a deviation correction coefficient file, and generating an evaluation correction effect.
Owner:EARTH SYST NUMERICAL PREDICTION CENT OF CHINA METEOROLOGICAL ADMINISTRATION
Method for calculating infrared spectrum radiation of non-equilibrium shock wave layer based on NO vibration excited state collision-radiation model
The invention particularly relates to a method for calculating non-equilibrium shock wave layer infrared spectrum radiation based on an NO vibration excited state collision-radiation model. The method comprises the following steps: constructing an NO infrared vibration excited state collision-radiation model; extracting flow field data along a certain specific direction, inputting the flow field data into the NO infrared vibration excited state collision-radiation model, and calculating NO vibration excited state particle number density; calculating each vibration state absorption coefficient of NO based on the NO vibration excited state particle number density; and calculating the absorptivity in any layer on the detection path based on each vibration state absorption coefficient in combination with an apparent ray method, and calculating the NO infrared spectrum radiance based on the absorptivity. The method solves the problems that the spectral radiation calculation precision in hypersonic thermodynamics and chemical unbalanced flow is not high, the unbalanced state is not considered in the calculation, and the excited state particle number density adopted in the calculation of the infrared spectral radiation of NO is inaccurate.
Owner:XIDIAN UNIV
A method and device for modeling and analyzing detection performance of an airborne infrared system disturbed by clouds
This invention provides a method and apparatus for modeling and analyzing the detection performance of an airborne infrared system with cloud interference. The method includes: dividing the cloud landscape into three different cloud scenarios based on the spatial geometric relationship between the cloud layer and the target and detector, and constructing an input parameter set; determining the equivalent target brightness and equivalent background brightness based on the input parameter set, and constructing a unified signal-to-noise ratio (SNR) model by combining the target radiance, background radiance, and atmospheric correction factor under clear-sky conditions, and solving the model; determining the SNR change rate and the detection distance change rate based on the solution results to construct a cloud interference model; comparing the SNR change rate and the detection distance change rate with measured data from field tests, and correcting the input parameter set in reverse based on the comparison error until the comparison error meets a preset threshold, thus completing the calibration of the cloud interference model. This improves the diversity, applicability, and practicality of the model, makes the analysis results traceable, and supports the evaluation of field test environments.
Owner:XIDIAN UNIV +1
A satellite observation operator construction method and system for a micro-gridded earth system
The application discloses a satellite observation operator construction method and system for a differentiable earth system, comprising the following steps: decomposing a satellite radiation transmission physical process into a plurality of differentiable calculation nodes, constructing a forward calculation graph, calculating an atmospheric state tensor, a prediction factor tensor, a total layer optical thickness tensor, a transmittance tensor, a top layer radiance tensor and an observed brightness temperature tensor through the differentiable calculation nodes, constructing a backward propagation calculation graph according to the forward calculation graph, and encapsulating the forward calculation graph, the backward propagation calculation graph and a standardized calling interface into a satellite observation operator. The method can not only realize end-to-end gradient propagation of an observation physical process, output observation and gradient information of the observation on an earth system state variable, but also has good interpretability and can be directly applied to a satellite observation operator construction system.
Owner:EARTH SYST NUMERICAL PREDICTION CENT OF CHINA METEOROLOGICAL ADMINISTRATION
A method for retrieving atmospheric N2O column concentration based on thermal infrared satellite remote sensing
PendingCN122133353AMaterial analysis by optical meansDesign optimisation/simulationAtmospheric layerRadiative transfer
This invention discloses a method for inverting atmospheric N2O column concentration based on thermal infrared satellite remote sensing, belonging to the field of atmospheric environment remote sensing technology. The method includes: acquiring and preprocessing satellite observation data; selecting a specific spectral range as the inversion characteristic spectral region; introducing a fast radiative transfer model to construct a forward simulation operator to simulate the radiance of the top atmospheric layer; selecting N2O-sensitive characteristic bands with high signal-to-noise ratio and low interference based on a channel optimization strategy using the N2O / CO2 Jacobi intensity ratio; constructing an extended state vector, using surface temperature as an unknown parameter and performing joint optimal estimation iterative inversion with the N2O profile to correct the surface temperature in the reanalysis data, thereby achieving high-precision inversion of N2O atmospheric column concentration. This invention transforms surface temperature from a fixed input parameter into a state variable to be inverted, effectively decoupling surface temperature error from the N2O signal, eliminating systematic bias, and significantly improving the inversion accuracy of N2O column concentration.
Owner:NANJING UNIV +1
A method and system for modeling the distribution of artificial light at night at an urban scale
This invention belongs to the field of image generation technology and discloses a method and system for modeling the distribution of artificial light at night at an urban scale. The invention acquires nighttime light remote sensing image data, land use type vector data, ground elevation data, and building morphology vector data of the study area; it uses the land use type vector data to perform super-resolution enhancement processing on the nighttime light remote sensing image data; based on the building morphology vector data and ground elevation data, it generates fixed-resolution three-dimensional point cloud data within the study area; based on the above data, it obtains horizontal and vertical radiance values; and it assigns the radiance values to the three-dimensional point cloud to visualize the distribution of artificial light at night at an urban scale. This invention enables three-dimensional modeling of nighttime light field distribution at an urban scale.
Owner:WUHAN UNIV