11 results about "Attenuation factor" patented technology

The application discloses a method for measuring optical constants of transparent solid based on a layered sample transmission spectrum analysis method, and belongs to the fields of spectroscopy and optical measurement. The principle of the application is that: layering flat sample materials with the same thickness, measuring the transmittance of two layered combination samples, deriving the transmittance t and reflectance r of light vertically through a single layer sample with a thickness of L through algebraic operation, then obtaining the attenuation factor y and the interface reflectance R through an analytical method, and further obtaining the extinction coefficient k and the refractive index n of the sample, so as to realize the measurement of the optical constants of the transparent solid. The application solves the problem of inconsistent conditions of measuring the reflection and transmission spectrum of the single layer sample in the prior art, and also solves the iteration error and the time-consuming calculation problem existing in the layered sample transmission spectrum inversion method, and greatly simplifies the experimental measurement and solving calculation process.

The invention discloses an ultraviolet index-based solar irradiation intensity prediction and correction method for a photovoltaic power station, and the method comprises the steps: obtaining free ultraviolet indexes, cloud layer parameters and conventional meteorological data through an API interface, firstly calculating the total ultraviolet intensity in an ideal state, and then correcting the total ultraviolet intensity in combination with an atmospheric attenuation factor and a cloud layer correction factor; dynamically determining the proportion of ultraviolet rays in the total solar irradiation intensity according to the solar altitude, and reversely deducing the initial total solar irradiation intensity; and finally, through real-time data of a local meteorological instrument, a baseline correction and dynamic error correction dual mechanism is constructed, and a prediction result is optimized. Through fusion of multiple meteorological factors, the prediction error is less than 10%, the photovoltaic power prediction system can be directly connected, and low-cost and high-precision data support is provided for optimized operation of the photovoltaic power station.

The invention discloses a method for measuring the angle of a cylindrical detector. The method comprises the following steps: setting a projection plane of the cylindrical detector; traversing all angles based on a single-frame result obtained by actual measurement of the cylindrical detector for the radioactive source, and projecting the assumed incident part and the assumed emergent part to the projection plane in a one-to-one correspondence manner to obtain a first projection point and a second projection point; enabling the first projection point and the second projection point to correspond to each other in an interpolation mode; multiplying and summing the first projection point and the second projection point to obtain an inner product result; and based on the Cauchy inequality, selecting the angle with the maximum inner product as a correct incident angle. According to the method, the incident angle is accurately and efficiently calculated by utilizing the property of the mathematical Cauchy inequality. Troubles of estimating attenuation factors and errors caused by the troubles of estimating the attenuation factors in a traditional method are avoided.

The application discloses a BIM building facade dynamic light-heat balance design method and system, and belongs to the technical field of building energy-saving design. The facade component information is parsed from a BIM model, azimuth weight factors and floor height attenuation factors are calculated according to azimuth angles and floor heights, and a space-time decomposition vector is constructed to form a facade design parameter set. Latin hypercube sampling is used to generate training samples, and a double-channel time series convolutional neural network proxy model is constructed, which includes an energy consumption prediction channel and a light environment prediction channel. Then, a multi-objective optimization solution is carried out to minimize the annual energy consumption of the building and maximize the daylighting effective time ratio as the optimization target, and a Pareto optimal solution set is generated. Based on the light-heat coupling index, the dynamic angle of the sunshade board at each time is calculated, and an annual hourly sunshade control strategy is generated. The application realizes the dynamic balance of the daylighting demand and the heat insulation demand of the building facade, and improves the optimization efficiency and the design quality.

The application discloses a kind of SAR data active integration's remote sensing data timing seamless reconstruction method and device, belong to remote sensing image processing and space-time information analysis technical field.Sentinel-2 waveband and Sentinel-1 dual polarization data are screened and time-space alignment, radiation normalization and cloud mask construction are completed;Parallel operation dual-branch deep network optical branch extracts multi-scale space-time characteristics, SAR branch uses deformable convolution+texture self-attention to mine multi-scale directional texture;Then optical characteristics are used as Query, in cloud mask marked area active search SAR Key-Value complementary information, realize deep fusion by cross-modal multi-head attention;Fusion result is jointly corrected by relative time distance coding, time attenuation factor and cloud perception mask, and long-time sequence attention drift is inhibited;Final level fusion multi-level feature and adaptive weighting are outputted, and full-time seamless image is outputted.

The invention discloses a star signal-to-noise ratio real scale effect compensation method, which comprises the following steps of: S1, constructing a star point centroid offset model to obtain an offset between a star point energy peak position and a pixel center where the star point energy peak position is located; s2, respectively obtaining ideal star point radiation intensity distribution and actual star point radiation intensity distribution according to different conditions that the star point energy peak position coincides with the center of the pixel where the star point energy peak position is located; s3, defining a scale attenuation factor eta as a central pixel star point radiation intensity ratio under two conditions that a star point energy peak value coordinate deviates from a pixel center and coincides with the pixel center; s4, calculating to obtain a corrected signal-to-noise ratio considering real scale effect compensation; the method has general applicability, is simple and convenient in calculation, can accurately predict the star point imaging signal-to-noise ratio, and can comprehensively evaluate the imaging quality of the star map.

The invention relates to the technical field of data calibration, and discloses a cloud water icing detection dynamic calibration method and system for an airborne terahertz radiometer, and the method comprises the steps: collecting external environment temperature and humidity data, and calibrating matching parameters; constructing an influence function of antenna icing on the flight platform on the preset terahertz frequency band radiation efficiency; performing icing analysis on the external environment temperature and humidity data to obtain an equivalent icing attenuation factor, correcting a target source radiation reference value stored in the airborne terahertz radiometer, and analyzing an environment compensation item and a system response item of the external environment temperature and humidity data; synthesizing the icing correction item, the environment compensation item and the system response item with the target source radiation reference value to generate a calibration coefficient; and compensating and correcting the original radiation signal of the terahertz frequency band received in real time by using the calibration coefficient to obtain a terahertz effective detection signal. According to the invention, the accuracy of dynamic calibration of cloud water icing detection can be improved.

The present application relates to the technical field of data calibration, and discloses a cloud water icing detection dynamic calibration method and system for an airborne terahertz radiometer, comprising: collecting external environment temperature and humidity data and calibration matching parameters; constructing an influence function of antenna icing on a flight platform on the radiation efficiency of a preset terahertz frequency band; performing icing analysis on the external environment temperature and humidity data to obtain an equivalent icing attenuation factor and correct a target source radiation reference value stored in the airborne terahertz radiometer; analyzing an environment compensation term and a system response term of the external environment temperature and humidity data; synthesizing the icing correction term, the environment compensation term and the system response term with the target source radiation reference value to generate a calibration coefficient; and using the calibration coefficient to compensate and correct real-time received original radiation signals of the terahertz frequency band to obtain a terahertz effective detection signal. The present application can improve the accuracy of cloud water icing detection dynamic calibration.

The invention discloses a vegetation pruning method and device, equipment, a storage medium and a product. The method comprises the steps of obtaining street lamp parameters and vegetation parameters of a target road section; wherein the street lamp parameters comprise street lamp height, and the vegetation parameters comprise leaf density and vegetation height; calculating a light attenuation factor by adopting a radiation transfer equation based on the street lamp parameters and the vegetation parameters; when the light attenuation factor is larger than a preset pruning threshold value, multi-round iteration is carried out on the vegetation pruning scheme, and the vegetation pruning scheme enabling the road surface lighting condition to be optimal is selected as the optimal vegetation pruning scheme so that vegetation pruning can be carried out on the target road section according to the optimal vegetation pruning scheme; wherein the road surface illumination condition and the light attenuation factor are in a negative correlation relationship. By considering the influence of vegetation on the lighting effect of the street lamp, the vegetation pruning scheme is optimized for guiding vegetation pruning, the lighting effect of the street lamp is improved, and therefore the energy utilization rate of the street lamp is effectively increased.

The invention discloses an energy-saving control method and system for a building group, and the method comprises the steps: collecting the visitor flow rate, natural light intensity, temperature difference abnormal data and equipment operation parameters of each region in the building group in real time, and carrying out the time-space correlation mapping with weather forecast and historical energy consumption data; air conditioner partition regulation and control parameters are generated based on a people flow density algorithm, and intelligent regulation of the air supply amount and the temperature is achieved in combination with dynamic correction factors; an illumination dynamic compensation strategy is generated through a light intensity difference model, and brightness changes are smoothly transited through attenuation factors; a heating mode switching instruction is generated according to the temperature difference threshold value and the building characteristics, and thermal comfort index optimization control logic is fused; and constructing a power distribution weight matrix, generating an energy demand curve by using a time sequence prediction model, adjusting the energy storage output power through feedforward compensation, and dynamically adjusting the regional power supply proportion to realize energy consumption balance. The overall energy efficiency can be improved, self-adaption to environment sudden change and periodic change is achieved, comfort is guaranteed, and meanwhile equipment loss is reduced.

The invention relates to the technical field of performance evaluation of electromagnetic shielding materials, in particular to a comprehensive performance evaluation method of an absorption type electromagnetic shielding material. The method comprises the following steps: constructing a comprehensive evaluation index system; the total shielding effectiveness, the reflection loss and the absorption loss of the material are obtained through a far field test, and an absorption coefficient, a reflection coefficient and an absorption dominant factor are determined; through a cavity effect test, comparing the internal field intensity of the cavity with the incident field intensity when the shielding body exists, and determining a cavity field intensity attenuation factor; determining an effective absorption bandwidth according to the absorption coefficient changing curve along with the frequency; determining a near-field absorption coefficient through a near-field test; integrating the indexes into a multi-dimensional evaluation vector, setting a weight according to an application scene, calculating a comprehensive score, and dividing grades. According to the method, multi-dimensional quantitative evaluation of the comprehensive performance of the absorption type electromagnetic shielding material is realized, and research, development and model selection of the material can be effectively guided.