71 results about "Absorption cross section" patented technology

According to the spectrum-to-mass concentration imaging method and device based on physical mechanism deep learning provided by the invention, the actually measured spectrum and the reference spectrum of the pollution gas smoke plume are collected, the spectrum data set is constructed after differential processing, the meteorological data and the online mass concentration label are synchronously collected, and meanwhile, the spectrum-to-mass concentration imaging method and device based on physical mechanism deep learning are provided. A high-resolution gas absorption section is obtained and is convolved into a matrix; and constructing a deep learning model fusing a feature extraction module, an expanded least square module and a full connection module, taking the spectral data set, the meteorological data and the absorption cross section matrix as input, performing training in combination with labels to obtain an optimization model, and predicting the mass concentration of the target gas. According to the method, the problems of error accumulation, low calculation efficiency and poor interpretability caused by dependence on a complex physical model in a traditional method are solved, and high-precision, high-efficiency and interpretable real-time imaging of the mass concentration of the smoke plume of the pollution gas is realized.

The invention discloses an active and passive combined observation carbon dioxide column concentration inversion method, and relates to the technical field of meteorological detection.The method comprises the steps that an active laser radar observation data set is obtained through arrangement according to month information and longitude and latitude information, and differential optical thickness is obtained through calculation based on a radar equation according to priori active laser radar observation data; according to the line-by-line integration principle, a carbon dioxide absorption cross section lookup table is constructed, priori profile data and differential optical thickness are combined, a correction coefficient matrix of a priori profile and corrected priori profile data are obtained through calculation, and according to the optimization algorithm principle, the corrected priori profile data serve as constraint, and the carbon dioxide absorption cross section is obtained. And the concentration of the carbon dioxide column is calculated based on the passive observation data, so that the inversion method provided by the invention not only comprises active laser radar observation, but also comprises the passive observation data, the active observation and the passive observation are effectively combined, more accurate prior profile information is provided, and the inversion precision is improved.

The invention discloses a satellite remote sensing atmospheric pollution gas concentration inversion method and system based on DOAS, and belongs to the technical field of atmospheric environment remote sensing monitoring. The method comprises the following steps: acquiring solar back scattering spectrum data observed by a satellite load and preprocessing the solar back scattering spectrum data; performing spectrum correction by using a high-precision instrument response function; in a selected fitting window, constructing a fitting model comprising a target gas differential absorption cross section, a Ring effect, Mie scattering and multiple scattering contributions; carrying out spectrum fitting by adopting a nonlinear least square algorithm, and carrying out inversion to obtain a differential batter column concentration (DSCD) of the target gas; in conjunction with an Atmospheric Mass Factor (AMF), the DSCD is converted to a Vertical Column Concentration (VCD). The system comprises a data acquisition and preprocessing module, a spectrum fine correction module, a DOAS spectrum fitting module, a dynamic AMF calculation module and a column concentration inversion and output module, and optionally comprises a data assimilation and traceability analysis module. According to the satellite remote sensing atmospheric pollution gas concentration inversion method and system based on the DOAS, the parameterized multiple scattering correction items are introduced, a dynamic AMF calculation scheme is developed, and the inversion precision and reliability under the complex atmospheric condition are remarkably improved.

The invention provides a low-cost ytterbium-doped Yb calcium silicate niobium aluminum gallium laser crystal and a preparation method and application thereof. According to the invention, Al < 3 + > is introduced to replace 50% Ga < 3 + >, Yb < 3 + > ions are doped, and the Yb: Ca3NbAl < x > Ga < 3-x > Si2O14 laser crystal (0lt; xlt; and 3) the raw material cost is greatly reduced, the growth period is shortened, the laser performance of the crystal is improved, the absorption cross section and the emission cross section of the crystal are increased, the half-peak width of absorption and emission peaks is broadened, the oblique efficiency and the light conversion efficiency of continuous laser output are further improved, the laser threshold value is reduced, and watt-level continuous laser output is obtained.

The invention relates to the technical field of spectrograph calibration, in particular to a spectrograph spectrum calibration and radiometric calibration method. According to the technical scheme, the method comprises spectrum calibration and radiometric calibration, the spectrum calibration comprises the steps that firstly, a standard light source is adopted for conducting initial spectrum calibration on an uncalibrated spectrometer to obtain an initial spectrum calibration equation, and then optical differential thickness data is obtained through a sample gas measurement experiment and combined with standard gas absorption cross section data; and calculating a wavelength difference value to correct the initial spectrum calibration equation to obtain a final spectrum calibration equation. The wavelength absolute error precision after spectrum calibration is improved by nearly one order of magnitude, the radiometric calibration error is greatly reduced, the stability and accuracy of radiometric calibration are remarkably improved, the problems that a traditional calibration method is limited in spectral line, poor in light source stability and large in extrapolation error are effectively solved, and the method is suitable for popularization and application. And a solid guarantee is provided for high-precision application of the spectrograph in the fields of environmental monitoring, material science, remote sensing technology and the like.

The invention relates to a high-performance copper (I)-based glass scintillator material and a preparation method thereof, and particularly discloses a Cu (I)-based hybrid metal halide optimized based on halogen engineering (Cl, Br, I), and the X-ray absorption cross section and the light output performance are remarkably improved. The light yield of the material reaches 79, 770 photons MeV <-1 > and is improved by 180% compared with that before optimization. The transparent glass scintillation screen (optical transmittance gt; the material has excellent X-ray imaging resolution (20.5 lp mm <-1 >), and also shows good thermal stability (stable luminescence performance at a high temperature of 150 DEG C) and anti-radiation durability. The material has the advantages of high light yield, low detection limit, high spatial resolution and the like, provides a breakthrough solution for application of the zero-dimensional halogenated cuprous-based scintillator in the fields of X-ray detection and imaging, and is particularly suitable for the fields of medical diagnosis, industrial nondestructive testing, high-energy physical detection and the like.

The invention relates to an ultra-low concentration NO detection method based on an ultraviolet differential optical absorption spectrum technology, and belongs to the field of gas detection. According to the method, on the basis of the classic DOAS technology, the process of calculating the differential absorption cross section of the detected gas is omitted, and a mathematical model of the differential optical density and concentration of the detected gas is constructed; when the gas is measured, the difference optical density of the gas to be measured only needs to be calculated and is substituted into the mathematical model, and the concentration value of the gas to be measured is calculated; and correcting the calculated gas concentration by using a temperature compensation method so as to obtain the accurate concentration of the gas to be detected. According to the invention, the detection of pollution gas in ultra-low emission flue gas is realized, and the requirements of new ultra-low emission on a monitoring system are met.

The application provides a PGNAA detection data comprehensive analysis method, which relates to the technical field of detection and comprises the following steps: acquiring the first element content, neutron absorption cross section and environmental temperature variation amount and humidity of a sample to be detected; adjusting the ray self-absorption correction coefficient of the first element content, adjusting the flux distribution based on the neutron absorption cross section, calibrating the peak position based on the environmental temperature variation amount, and correcting the background based on the environmental humidity; and through case-by-case processing, when the relevant parameters exceed the threshold value, the synergistic calculation and simulation are adopted, otherwise the standard value is used, so that the accurate comprehensive analysis of the PGNAA detection data is realized, and the accuracy and adaptability of the detection result are improved.

This invention discloses a data processing method for carbon dioxide column concentration based on a spaceborne lidar, comprising: performing nonlinear correction on the spaceborne integral path differential absorption (IPDA) lidar detection signal; calculating the differential optical thickness based on the IPDA lidar signal; calculating the echo height above sea level and geographic coordinates based on the echo signal location; establishing an absorption cross-section lookup table using differential absorption cross-section data from the High Resolution Transmission Molecular Absorption (HITRAN) database; calculating the pressure at the echo location using the European Centre for Medium-Range Weather Forecasts Reanalysis Dataset (ERA5) and the echo signal height above sea level; calculating the Doppler frequency shift; calculating a weighting function based on pressure profiles, humidity profiles, temperature profiles, and Doppler frequency shift data; and calculating the carbon dioxide column concentration. The key features of this invention are the nonlinear correction of the spaceborne IPDA lidar echo signal, the establishment of a differential absorption cross-section lookup table for carbon dioxide molecules, and the accurate and efficient calculation of the carbon dioxide column concentration using spaceborne IPDA lidar detection data and ERA5 meteorological dataset data.

The invention provides a PGNAA detection data comprehensive analysis method, and relates to the technical field of detection, and the method comprises the following steps: obtaining the first element content, neutron absorption cross section, environment temperature variation and humidity of a detected sample; adjusting a ray self-absorption correction coefficient based on the first element content, adjusting flux distribution based on a neutron absorption cross section, calibrating a peak position based on an environment temperature variation, and correcting a background based on environment humidity. According to the method, through processing according to conditions, when relevant parameters exceed threshold values, modes such as cooperative calculation and simulation are adopted, otherwise, standard values are used, accurate comprehensive analysis of PGNAA detection data is achieved, and the accuracy and adaptability of detection results are improved.

Various embodiments herein relate to techniques for depositing photoresist material on a substrate. For example, the tin techniques may involve providing the substrate in a reaction chamber; providing a first and second reactant to the reaction chamber, where the first reactant is an organo-metallic precursor having a formula of M1aR1bL1c, where: M1 is a metal having a high patterning radiation-absorption cross-section, R1 is an organic group that survives the reaction between the first reactant and the second reactant and is cleavable from M1 under exposure to patterning radiation, L1 is a ligand, ion, or other moiety that reacts with the second reactant, a≥1, b≥1, and c≥1, and where at least one of the following conditions is satisfied: the photoresist material comprises two or more high-patterning radiation absorbing elements, and / or the photoresist material comprises a composition gradient along a thickness of the photoresist material.

The present application relates to the field of optical measurement technology, disclose a kind of based on open optical path atmospheric NO3 radical measurement system and method, system includes light source module, first convex lens, first high reflectivity lens, second high reflectivity lens, detachable cavity, second convex lens and spectrometer, the present application is directly sampled to the air between high reflect lens by the design of open optical path, avoid the wall loss of NO3 radical in active sampling, to improve the sensitivity and accuracy of measurement. While introducing the design of detachable cavity, realize the flexible switching of zero air and actual atmospheric sampling. The introduction of zero-point spectral library method effectively compensates the influence of temperature and humidity change on light source and spectrometer, the spectral shift caused by environmental change is eliminated by dynamic calibration, in addition, the input of real-time water vapor absorption cross section can accurately remove the influence of water vapor absorption on NO3 radical measurement, further improve the reliability of measurement result.

The present invention relates to a wide-range concentration detection system and method for a gas analyzer. The system includes a light source, a collimator, a measuring cell, a spectrometer, a temperature controller, a signal converter, a data acquisition module, and a data analysis module. The method collects a reference zero-point spectrum and concentration sequence spectra of n gases as reference original spectrum sequences, performs differential, normalization, and polynomial fitting on the reference zero-point spectrum and obtains n fitting coefficient matrices for the n gases. The matrix is ​​then combined with the real-time differential spectrum of the gas to be measured to form a nonlinear equation system. The least squares method is used to solve the nonlinear equation system to obtain the initial normalized concentration solution of each gas. The initial normalized concentration solution is further optimized and denormalized to obtain the final concentration value of each gas. The present invention solves the problem of gas concentration detection when the absorption cross section and concentration of the gas to be measured have a nonlinear relationship, and has high detection efficiency and detection accuracy, and a wide concentration detection range.

The invention belongs to the technical field of nuclear reactor materials, and particularly relates to anti-radiation medium-entropy ceramic as well as a preparation method and application thereof. In order to enable a core material of a fourth-generation reactor to have better radiation resistance, the invention provides the radiation-resistant medium-entropy ceramic material, and the chemical composition of the radiation-resistant medium-entropy ceramic material is (TiaZrbNbc) C, wherein a is equal to 5at%-33at%, b is equal to 33-67at%, c is equal to 33at%-58at%, a + b + c is equal to 1, and the component of Zr and Nb is higher than that of Ti. The components of transition metals (Ti, Zr and Nb) are regulated and controlled, and the components of Zr and Nb are higher than those of Ti, so that the medium-entropy ceramic still has a low neutron absorption cross section.

The application discloses a method for determining the position of drilling fluid leakage and calculating leakage parameters, which is used for finding the position of well leakage during drilling, calculating the leakage speed and leakage amount of drilling fluid, and estimating the leakage scale. The application describes the principle that the photoelectric absorption cross section Pe value of barite contained in the drilling fluid is abnormally high compared with other rocks, minerals and fluids, and the leakage position is accurately positioned by the characteristics of the high value of the Pe curve measured by the lithology density logging in the leakage well section, and the leakage speed is predicted by the correlation between the Pe logging value and the instantaneous leakage speed, and the leakage amount is calculated by combining the method of multi-mineral analysis with the actual content of barite in the drilling fluid. The method is simple and easy to operate, and the accuracy is reliable. Compared with the data provided by the field, the error of the leakage speed and the leakage amount calculated by the method is small, and the effect is good.

The invention relates to the technical field of microwave measurement and reverberation chambers, in particular to a theoretical model for reverberation chamber testing of an equivalent absorption cross section of a wave-absorbing material based on the mirror image principle and application, and the method comprises the steps: building a mirror image model, and obtaining the number of mirror image objects after multiple reflections and the total surface area of the mirror image model; acquiring a time constant in a no-load state; acquiring a time constant in a loading state; and constructing a theoretical model for testing the reverberation chamber of the equivalent absorption cross section of the wave-absorbing material. The mirror image principle is applied to the field of microwave measurement based on the reverberation chamber, and rapid and accurate equivalent absorption cross section reverberation chamber testing is achieved.

The application discloses a shale gas reservoir biological silicon content logging calculation method based on unit volume effective photoelectric absorption cross section index, and solves the problems of complex cost, inability to meet field large-scale, regional, low-cost evaluation and large calculation error of existing biological silicon content logging calculation methods. The method calculates unit volume effective photoelectric absorption cross section index from logging photoelectric absorption cross section index Pe and logging lithology density DEN data, and then calculates shale gas reservoir biological silicon content. The method can be used in coring wells, and has universal application value for all shale gas wells, and has smaller error and lower cost.

The present invention belongs to the field of gas field technology, and specifically relates to a method for determining the unimpeded flow and production allocation of a dense carbonate reservoir. The unimpeded flow determination method first obtains the residual thickness of the dense carbonate reservoir, the thickness of the dolomite reservoir, the photoelectric absorption cross-sectional index, and the structural curvature of the factors related to the unimpeded flow model, and then substitutes them into the unimpeded flow model to obtain the unimpeded flow of the dense carbonate reservoir; and the unimpeded flow model is constructed based on the relationship between the unimpeded flow and at least two factors of the residual thickness, the dolomite reservoir thickness, the photoelectric absorption cross-sectional index, and the structural curvature, and the dolomite reservoir thickness and the structural curvature are both positively correlated with the unimpeded flow, and the residual thickness and the photoelectric absorption cross-sectional index are both negatively correlated with the unimpeded flow. The present invention uses the established unimpeded model to obtain the unimpeded flow, the method is simple, the calculation result is highly accurate, the prediction accuracy of the production capacity is high, and the development effect of the gas well is guaranteed.

The invention discloses a tunable mid-infrared fiber laser with high power flatness. A pumping source enters an erbium-doped fiber through a pumping / signal coupler, and a low-reflectivity cavity mirror, the erbium-doped fiber, a laser collimator and a tuned filter form a laser resonant cavity; the low-reflectivity cavity mirror and the pumping / signal coupler are coupled to output intermediate infrared laser, the tuning filter device is used for realizing a wavelength tuning function, and the insertion loss difference value of the device under different working wavelengths is less than 0.5 dB; the wavelength of the pumping source is in a 1.6-1.7 micron wave band, erbium ions are pumped from a ground state energy level to a laser upper energy level, and laser lower energy level particles are consumed; the stable insertion loss in the process of adjusting the working wavelength by using a tuning filter device is combined with the characteristics that the emission cross section and the absorption cross section of erbium ions are gradually reduced along with the increase of the wavelength and the reduction rate of the absorption cross section is greater than that of the emission cross section, so that the gain difference caused by the emission cross section difference under different laser wavelengths of the fiber laser is reduced; and the power flatness of the fiber laser under different tuning wavelengths is improved.

The invention relates to the field of semiconductors, and discloses an infrared photoelectric detector, a manufacturing method thereof and electronic equipment, and the method comprises the steps: growing a buffer layer on the upper surface of a substrate; forming an epitaxial structure layer on the upper surface of the buffer layer, and forming a nanowire array structure above the buffer layer; the nanowire array structure comprises a plurality of nanowires, and each nanowire is perpendicular to the upper surface of the buffer layer; forming a transparent conductive layer on the upper surface of the nanowire array structure; and growing a first electrode on the upper surface of the transparent conductive layer, and growing a second electrode to obtain the infrared photoelectric detector. According to the invention, the vertical nanowire array structure has a remarkable quantum effect and excellent photoelectric performance, and has a great absorption cross section and strong light interaction between nanowires, so that the vertical nanowire array structure has the characteristics of low reflection and strong broadband absorption, optical coupling of the infrared photoelectric detector can be increased, and the photoelectric performance of the infrared photoelectric detector can be improved. And the infrared photoelectric detector realizes high light absorption and high quantum efficiency.

The application discloses a method for determining biological silicon content in shale gas reservoirs based on lithology density logging data, and solves the problems of complex cost, inability to meet field scale, regional, low-cost evaluation and large calculation error of existing biological silicon content logging calculation methods. The method comprises the following steps: obtaining logging lithology density DEN, logging photoelectric absorption cross-section index Pe and logging natural gamma GR, establishing a ternary calculation equation based on the lithology density logging data, and then calculating the biological silicon content Si_toc in the shale gas reservoirs of the well to be interpreted. The method can be applied in coring wells, and has universal application value for all shale gas wells, and has smaller error and lower cost.

The invention belongs to the technical field of laser radar detection, and particularly relates to a buoy-borne CO2 inversion method, system and equipment based on laser radar detection, which can realize real-time dynamic calculation of an absorption cross section with lower calculation cost by applying a model, avoid a complex physical model and a large amount of spectral data search in traditional absorption cross section calculation, and improve the calculation accuracy of the absorption cross section. Powerful support is provided for carbon dioxide concentration inversion, the problems that a traditional calculation method is long in time consumption and low in efficiency are solved, and the high-timeliness measurement requirement is met. The method is not only suitable for inversion of carbon dioxide concentration, but also can be expanded to calculation of absorption cross sections of other gases, and has a wide application prospect.

The invention relates to the field of micro-nano structure arrays and solar energy absorption, in particular to a super-surface-based Cu2ZnSnS4-based visible light efficient absorber as well as a preparation method and application of the super-surface-based Cu2ZnSnS4-based visible light efficient absorber. The solar visible light wave band absorption efficiency of the Cu2ZnSnS4-based series material is improved by utilizing the incident light regulation and control capability of the metasurface. The optical absorption cross section of incident light is increased through surface plasmon resonance of the metal aluminum nanodisk array; the frequency of action between incident light and the Cu2ZnSnS4-based series material is increased through cavity resonance of the Al2O3 medium nano hexahedron array; the refractive index jump gradient of incident light on the surface of the Cu2ZnSnS4-based series material is reduced through the free space impedance matching layer, so that the impedance matching condition is realized. And the three components are combined to form the visible light absorber with high absorption efficiency. The super-surface Cu2ZnSnS4-based visible light efficient absorber provided by the invention has the advantage of high visible light absorption rate.

The application relates to an anti-radiation high-entropy MAX phase ceramic and a preparation method thereof, and belongs to the technical field of nuclear reactor materials. a Zr b V c Nb d Ta e )2AlC; wherein a+b+c+d+e=1. The high-entropy MAX phase ceramic provided by the application has radiation resistance and high-temperature resistance, has a small neutron absorption cross section, can inhibit the growth of radiation defects and helium bubbles, and improves the safety of nuclear materials.

The present application relates to the technical field of microwave measurement and reverberation chamber, and particularly relates to a theoretical model of a reverberation chamber test of an equivalent absorption cross section of a wave-absorbing material based on a mirror principle and application, comprising: establishing a mirror model, and obtaining the number of mirror objects after multiple reflections and the total surface area of the mirror model; obtaining a time constant in an unloaded state; obtaining a time constant in a loaded state; and constructing a theoretical model of a reverberation chamber test of an equivalent absorption cross section of a wave-absorbing material. The present application applies the mirror principle to the field of microwave measurement based on a reverberation chamber, and realizes a fast and accurate reverberation chamber test of an equivalent absorption cross section.

To provide a material with large two-photon absorption cross-sectional area.SOLUTION: A two-photon absorption material is provided, containing a molecule having a thiolate ligand and a metal thiolate complex bound to a surface of a small atomic cluster nucleus. An element constituting the small atomic cluster nucleus and a metal element constituting the metal thiolate complex are Au, and the small atomic cluster nucleus of the molecule of the metal thiolate complex has an atomic number in a range of 10-56.SELECTED DRAWING: None

The present invention discloses an A-π-D-π-A' type two-photon fluorescent compound and its synthesis method and application. The compound is shown in formula (I). The present invention provides a synthesis method of the compound, comprising the following steps: (1) a compound of formula (II) undergoes a bromomethylation reaction with paraformaldehyde and hydrobromic acid to obtain a compound of formula (III); (2) the compound of formula (III) is first salified with hexamethylenetetramine, and then undergoes a hydrolysis reaction to obtain a compound of formula (IV); (3) the compound of formula (IV) undergoes a unilateral dehydration condensation reaction with 2-methylbenzoxazole to obtain a compound of formula (V); (4) the compound of formula (V) undergoes a dehydration condensation reaction with a compound of formula (VI) to obtain a compound of formula (I). The compound has a large two-photon fluorescence active absorption cross section and Stokes shift, good living cell penetrability and low cytotoxicity, and can be used for two-photon fluorescence imaging in living cells.

The present invention provides a method for measuring gas photolysis rate. Specifically, the solar spectrum in the atmosphere is first received by a quartz receiving head with uniform angular response in all directions, and the spectrum information is uniformly transmitted to a spectrometer through a quartz light guide rod and an optical fiber to obtain spectrum data; then, the measured spectrum data is converted into spectrum radiance by integrating sphere radiation calibration; finally, the photolysis rate of different gas substances is obtained by using an integral formula and the spectrum function data of each gas, that is, the absorption cross section σ and quantum yield φ of each gas. The present invention has a simple overall structure, a compact size, a high degree of integration, and greatly saves costs.

A kind of light-weight high-temperature-resistant high-performance n / γ composite shielding material for space nuclear reactor, the composition of composite shielding material is: Gd-MOF mass fraction is 5wt%-40wt%, Pb-MOF mass fraction is 10wt%-40wt%, PI is matrix, high H content of PI is used to slow down fast neutron into thermal neutron, and the synergistic effect of high thermal neutron absorption cross section of Gd and high efficient γ shielding of Pb, combined with the chemical coordination characteristics of outer electron of Gd and Pb, metal-organic framework MOF porous structure is prepared, in-situ chemical synthesis is used to realize the interpenetration and winding of PI molecular chain in Gd-MOF and Pb-MOF porous structure, to improve the mechanical properties of composite material, and high efficient n / γ composite shielding function is obtained, the shielding material composition is good in uniformity, with high efficient n / γ composite shielding function and good comprehensive mechanical properties, resistant to high and low temperature and anti-radiation aging, can be used for long time in-260℃~+350℃ environment, can be applied to the demand of light-weight high-temperature-resistant high-performance n / γ composite shielding material for space nuclear reactor and micro-advanced nuclear energy system.

Disclosed in the present invention is a low-concentration gas measurement method based on direct absorption spectroscopy. In the method, real-time measured spectral data of a gas under test and a database of absorption cross sections of said gas measured in a laboratory are used, the concentration of SO2 is calculated by means of ultraviolet differential absorption spectroscopy, an interference spectrum of SO2 on NO2 is calculated, the influence of SO2 on the absorbance of NO2 is eliminated, the absorbance at a zero absorption position is calculated, the influence of spectral attenuation on measurement is eliminated, and the concentration of NO2 after elimination of cross interference is accurately calculated, thereby greatly improving the measurement accuracy and lowering the measurement limit.