79 results about "Absorption band" patented technology

The invention belongs to the technical field of water pollutant identification, and particularly relates to a water pollutant distinguishing method and system based on multi-source spectrum fusion. According to the method, ultraviolet visible spectrum data and three-dimensional fluorescence spectrum data are effectively integrated in a multi-source spectrum data fusion mode, so that the characteristic information of water pollutants is captured, stably appearing characteristic absorption wavebands can be positioned by utilizing the ultraviolet visible spectrum data, and the water pollutants can be accurately detected. The method comprises the following steps: identifying a characteristic sub-region capable of representing the fluorescence response characteristic of a pollutant through three-dimensional fluorescence spectrum data, in a characteristic extraction stage, performing first-order derivative operation on an ultraviolet visible spectrum to position an absorption peak position, calculating curvature distribution of a three-dimensional fluorescence spectrum to identify the characteristic sub-region, and when a fusion characteristic is generated, performing first-order derivative operation on the three-dimensional fluorescence spectrum to identify the characteristic sub-region; according to the method, the key operation parameters are subjected to grid search optimization, and the optimal key operation parameter combination is screened out by performing multiple rounds of iterative training and evaluation on a preset training set and a verification set, so that the recognition performance of the real-time collected water sample is improved.

The invention relates to a PVB (polyvinyl butyral) composite film as well as a preparation method and application thereof. The PVB composite film is prepared from the following raw materials in parts by weight: 100 parts of PVB resin, 1-10 parts of nano praseodymium oxide, 1-10 parts of a dispersing agent, 0.01-1 part of a coupling agent and 20-50 parts of a plasticizer. The nano praseodymium oxide is added into the PVB resin, and the infrared absorption band of the PVB composite film is optimized by utilizing the infrared absorption performance, chemical stability and heat-resistant stability of the nano praseodymium oxide, so that infrared radiation can be efficiently blocked, and the excellent heat insulation effect and long-term use stability of the PVB composite film are realized. Furthermore, the nano praseodymium oxide is modified by a coupling agent, so that the dispersion uniformity of the nano praseodymium oxide in the PVB resin and the interface bonding force of the nano praseodymium oxide and the PVB resin are improved, the light transmittance loss of the PVB composite film is reduced, and the mechanical property and the heat insulation property of the composite film are improved.

The invention discloses a near-infrared dichroic dye, a liquid crystal composition and application of the near-infrared dichroic dye and the liquid crystal composition. The structural general formula of the disclosed dichroic dye is as shown in formula I in the specification. According to the invention, a hydrogenated quinoline ring, a hydrogenated benzopyran ring and a hydrogenated naphthalene ring are introduced into a molecular skeleton, so that the novel near-infrared dichroic dye with high light stability, high solubility, high order parameter and high light modulation capability is obtained. Compared with the near-infrared dichroic dye disclosed in the prior art, the absorption band is further subjected to red shift, and the light modulation capability is remarkably improved; ordering parameters are greatly improved, and the application bottleneck is solved.

Provided is a light-emitting element which includes a light-emitting layer containing a phosphorescent compound, a first organic compound, and a second organic compound between a pair of electrodes. A combination of the first organic compound and the second organic compound forms an exciplex (excited complex). An emission spectrum of the exciplex overlaps with an absorption band located on the longest wavelength side of an absorption spectrum of the phosphorescent compound. A peak wavelength of the emission spectrum of the exciplex is longer than or equal to a peak wavelength of the absorption band located on the longest wavelength side of the absorp-tion spectrum of the phosphorescent compound.

The invention provides a gradient wave-absorbing PMI (polymethacrylimide) foam material as well as a preparation method and application thereof, and the gradient wave-absorbing PMI foam material is prepared by the following steps: soaking PMI foam beads in an adhesive containing a wave-absorbing agent, and drying after soaking to respectively obtain wave-absorbing functional beads containing wave-absorbing agents with different loading capacities; sequentially paving the wave-absorbing functional beads containing the wave-absorbing agents with different loading capacities on the surface of a mold, and performing high-temperature foaming to obtain the gradient gradually-changing wave-absorbing PMI foam material; in the direction away from the surface of the mold, the loading capacity of the wave absorbing agent in the wave absorbing functional beads is sequentially increased, and the PMI foam material prepared by the preparation method is matched with air impedance through the surface low dielectric constant layer, so that incident reflection is reduced; the middle transition layer enhances electromagnetic wave penetration; the bottom high-loss layer deeply loses electromagnetic waves, the gradient dielectric change significantly widens the absorption frequency band, and the continuous gradient design eliminates the impedance step and interlayer air gap of the traditional multilayer structure, thereby avoiding interlayer separation and reflection loss.

The present invention relates to a capsule luminescence pigment comprising a luminescent substance and a photochemically switchable absorber as a molecular switch, wherein the luminescent substance and the photochemically switchable absorber are dissolved and / or dispersed as separate molecules in a polymer particle, the luminescent substance has an energy transfer level relevant for luminescence, the photochemically switchable absorber has a first absorption spectrum in a first switching state and a second absorption spectrum in a second switching state, wherein the energy transfer level relevant for the luminescence of the luminescent substance falls significantly into an absorption band of the photochemically switchable absorber in the second switching state, so that significantly more intense luminescence of the luminescent substance occurs in the first switching state than in the second switching state of the photochemically switchable absorber.The present invention further relates to a switchable luminescent printing ink comprising a capsule luminescent pigment as described herein and to a security document, preferably a banknote, comprising an imprint with a first switchable luminescent printing ink as described herein.

The present invention discloses an ABX3 perovskite composite electromagnetic wave absorption material and a preparation method, which belongs to the field of electromagnetic wave absorption material preparation. The first step is to prepare ABX3 perovskite by dry grinding, and then dry and heat treat it. The second step is to uniformly mix and compound the prepared ABX3 perovskite with carbon nanotube materials according to different mass ratios. The present invention adopts a solvent-free method to prepare ABX3 perovskite-type absorption material, which is in the form of irregular nanoparticles and forms a conductive network structure with carbon nanotubes. The suitable structure constructed in this way has a strong absorption effect on electromagnetic waves and has a wide absorption band. The material preparation method does not require toxic solvents, has simple synthesis equipment, low cost, few processes, high yield, and is suitable for large-scale preparation.

The invention discloses a CaLaPrNdGdFeO perovskite high-entropy ferrite wave-absorbing material as well as a preparation method and application thereof, and belongs to the technical field of electromagnetic wave absorbing materials. The chemical composition of the material is (Ca < 0.2 > La < 0.2 > Pr < 0.2 > Nd < 0.2 > Gd < 0.2 >) FeO3. The preparation method comprises the following steps: dissolving metal nitrate and a complexing agent in water, adjusting to alkalescence to obtain a metal ion-complexing agent solution, heating to obtain gel, aging, drying and carrying out self-propagating reaction to obtain precursor xerogel; and then grinding, pre-sintering and carrying out heat treatment. The ferrite wave-absorbing material composed of the equimolar high-entropy components fully solves the disadvantages of narrow effective wave-absorbing frequency band and poor low-frequency performance stability of the traditional ferrite, has the advantages of strong synthesis stability, good oxidation resistance, high absorption efficiency and stable performance, can absorb electromagnetic waves in the microwave band of 2-18 GHz, and has a wide application prospect. And the material can be used in the fields of stealth coatings, electromagnetic shielding, 5G communication devices and the like.

This invention discloses a low-pass, high-absorption energy selective surface based on magnetic materials, comprising multiple periodically distributed units. Each unit includes, from top to bottom, a magnetic material layer and an energy selective layer. The energy selective layer includes a dielectric substrate, and first to seventh metal structures and first to eighth diodes disposed on the dielectric substrate. This invention achieves a low-intervention, low-frequency passband with low insertion loss and an ultra-wide absorption band at high frequencies by forming a complete circuit through multiple diodes and impedance matching between the magnetic material and the energy selective layer. When low-power electromagnetic waves are incident, it achieves high shielding effectiveness within the operating frequency band and an ultra-wide absorption band outside the band. The overall design of this invention is simple, the principle is clear, it is easy to manufacture, and it is inexpensive, with broad application prospects.

Light-emitting element comprising: a first electrode (103); a light-emitting layer (703) above the first electrode (103), wherein the light-emitting layer (703) comprises a guest material and a host material; and a second electrode (108) above the light-emitting layer (703), where a fluorescence spectrum of the host material and a phosphorescence spectrum of the host material overlap the absorption band on the longest wavelength side (the side of lowest energy) in the absorption spectrum of the guest material, wherein the difference between the energy value of the maximum of the fluorescence spectrum of the host material and the energy value of the maximum of the absorption band on the side of the lowest energy in the absorption spectrum of the guest material, wherein this maximum has an absorption wavelength corresponding to a direct transition from the singlet ground state to the lowest excited triplet state of the guest material, is 0.2 eV or less, wherein the host material is a mixture of a heterocyclic compound and an aromatic amine compound or carbazole compound, and where the level of a triplet excitation energy of the host material is higher than the level of a triplet excitation energy of the guest material.

The invention relates to the field of luminescent materials, and particularly discloses near ultraviolet excited blue fluorescent powder and application thereof, the molecular formula of the fluorescent powder material is Ca3Lu2Si3O12: xCe < 3 + >, x is the molar doping amount of Ce < 3 + >, 0 lt; and x is less than or equal to 0.10. The preparation method of the series of blue fluorescent powder adopts a high-temperature solid-phase method for synthesis, is mature in process and has large-scale production potential. The fluorescent powder shows nearly 100% internal quantum efficiency, the value of the internal quantum efficiency is as high as 99%, the fluorescent powder has broadband emission in the range of 350-600nm and has high matching degree with a blue light absorption band of a plant photosynthetic pigment, and a blue light LED device with high brightness and good matching with plant pigment absorption can be obtained by assembling the blue light material and a 365nm purple light chip.

The invention relates to a sensor (1) for simultaneously measuring a pressure and a velocity, comprising: - a crystal (2) comprising a face covered with a reflective layer (3); - a pumping laser (4) configured to emit a pumping beam (F1) towards the crystal and having a wavelength comprised in an absorption band of the crystal so that the illumination of the crystal by the pumping beam excites a portion of the electrons of the crystal; - a spectrometer (6) for receiving a luminescence signal (S1) resulting from the de-excitation of the electrons of the crystal, and for measuring the variation over time in the wavelength of the spectral lines of the luminescence signal; - an interferometry system (12) configured to measure the variations in velocity of the reflective layer over time by means of laser Doppler velocimetry.

The application discloses a kind of quasi-terahertz wave full absorption metasurface absorber and preparation method thereof, the structure of absorber includes: the design of silica layer, graphene multilayer structure and metal base;The structural design of top silica four pyramid;The structural design of multilayer graphene electric control simultaneously.The application uses multilayer graphene to enhance terahertz wave absorption, through the control of external bias voltage, can control the absorption intensity of low-frequency absorption band, realize certain degree of tunability.In terahertz wave band, the metasurface absorber proposed in the application can reach 96.33% average absorption in 0.5-10.0THz band.The application can effectively solve the problem that current absorber can only absorb part of terahertz wave band, open a new road for high performance of terahertz wave absorption field device.

This invention relates to the fields of atmospheric physics and remote sensing, and particularly to a method and system for obtaining upward atmospheric transmittance in the infrared absorption band. The method includes: directly measuring solar spectral data from the ground; simultaneously measuring atmospheric composition profiles in the directions of the sun and satellite; calculating the downlink measured transmittance based on the measured data; calculating the downlink and uplink theoretical transmittance based on the profiles using a radiative transfer model; comparing the downlink measured and theoretical transmittance to verify errors; calculating a correction coefficient based on the uplink and downlink theoretical transmittance; and using this correction coefficient to correct the downlink measured transmittance to obtain the final uplink atmospheric transmittance. The system includes spectral measurement, profile measurement, and data processing units for implementing the above method. This invention combines the high precision of direct measurement with the physical extrapolation capability of theoretical models, solving the problem of obtaining high-precision uplink atmospheric transmittance and providing a reliable technical solution for satellite remote sensing calibration.

Light-emitting element, comprising: a pair of electrodes; and a first light-emitting layer and a second light-emitting layer between the pair of electrodes, where the second light-emitting layer is in contact with the first light-emitting layer, wherein the first light-emitting layer comprises a first phosphorescent compound, a first organic compound and a second organic compound, wherein the second light-emitting layer comprises a second phosphorescent compound, the first organic compound and the second organic compound, wherein the first organic compound and the second organic compound form an exciplex, the first organic compound is a nitrogen-containing heteroaromatic compound, where the second organic compound is a π-electron-rich heteroaromatic compound or an aromatic amine compound, where a peak of an emission spectrum of the first phosphorescent compound has a shorter wavelength than a peak of an emission spectrum of the second phosphorescent compound, and where the difference between the energy of a peak in an emission spectrum of the exciplex and the energy of a peak in an absorption band on the longest wavelength side in an absorption spectrum of the first phosphorescent compound is 0.2 eV or less.

The application discloses a kind of perfect cutoff absorber of metasurface based on nano round structure, adopt nanometer cylinder and ring array grown on silicon dioxide, two groups of ring structure are respectively selected using dielectric material gallium arsenide and silicon.Optimizing structure parameter, wavelength from ultraviolet to mid-infrared, 0.913 average absorption is realized in absorption band 100-710nm, and average absorption is only 0.02 in non-absorption band 1260nm-20μm wave band.ER is 9.6dB, ED is 0.81, and CS is 0.0015nm ‑1 The perfect cutoff absorber provided by the application has exactly this spectral selectivity, which provides an effective method for designing ideal solar heat absorber, which has important application in the field of renewable energy, such as solar thermal photovoltaic and solar thermal energy application.

The invention belongs to the field of blood glucose detection, and relates to a high-sensitivity blood glucose noninvasive detection method and system based on polarized terahertz photoacoustic, which combines the advantages of terahertz wave band detection and photoacoustic detection, fully utilizes the chiral characteristics of glucose molecules, and adopts polarized terahertz photoacoustic to detect the blood glucose concentration. Polarization optical rotation change information is extracted through the time domain photoacoustic signal; by selecting the characteristic absorption wave band of glucose and utilizing the difference between glucose and other blood components in chiral characteristics, the influence of water and other high-concentration ions on terahertz signals is remarkably reduced, so that the selectivity and the anti-interference capability of blood glucose detection are effectively improved; terahertz non-ionizing radiation is adopted as an excitation source, no ionizing injury risk is caused to a human body, and the device is suitable for long-term repeated detection and is expected to be popularized and applied in wearable or bedside monitoring equipment.

To provide a light-emitting element with high external quantum efficiency and low driving voltage.SOLUTION: A light-emitting element includes, between a pair of electrodes, a light-emitting layer containing a phosphorescent compound, a first organic compound, and a second organic compound, wherein the first organic compound and the second organic compound form an exciplex, a light emission spectrum of the exciplex overlaps with an absorption band located at the longest wavelength side in an absorption spectrum of the phosphorescent compound, and a peak wavelength of the light emission spectrum of the exciplex is equal to or longer than the peak wavelength of the absorption band located at the longest wavelength side in the absorption spectrum of the phosphorescent compound.SELECTED DRAWING: Figure 1

The objective of the present disclosure is to enhance resolution in at least a propagation direction of promotion light in a stereolithographic technique using a liquid phase polymerization method. A stereolithographic method according to the present disclosure includes: a region defining step (S11) of defining a first region to be irradiated with promotion light on a molding surface set inside a photocurable resin and a second region to be irradiated with inhibition light; and an irradiation step (S13) of irradiating the first region with the promotion light having a wavelength λ1 which is n times (n is an integer of 2 or more) greater than a first absorption wavelength included in the absorption band of the polymerization initiator, and irradiating the second region with the inhibition light having a wavelength λ2 which is a second absorption wavelength included in the absorption band of the polymerization inhibitor. In the irradiation step, the polymerization initiator is activated by n-photon absorption of photons of the promotion light.

The present application relates to the field of spectrum correction, and discloses a kind of ultraviolet spectrum wavelength shift adaptive correction method, equipment and storage medium, method includes the following steps: optimization multi-objective gas basic reference spectrum acquisition mode;The original absorbance spectrum of multi-objective gas is measured;According to the preliminary prediction concentration of each target gas and the optimized basic reference spectrum obtained from original absorbance spectrum preliminary prediction, obtain real-time contrast addition spectrum;Original absorbance spectrum is corrected using correction model based on translation and stretching simultaneously;The similarity between real-time contrast addition spectrum and corrected absorbance spectrum is calculated, and iterative operation is carried out, the correction model parameters are adjusted, until the similarity reaches the preset condition, to obtain the final correction model;Adaptive correction of the absorbance spectrum of the target gas to be measured is completed using the final correction model.The present application is more suitable for the actual drift change in the field, even if the characteristic absorption band of multiple components overlaps, wavelength drift correction can also be carried out in real time and effectively.

An illumination source is configured to illuminate a medium, having a chromium-based dopant, with light at a wavelength selected based on an emission band of a selected absorption band of the medium. The selected absorption and emission bands being associated with an electric-dipole-allowed transition of the medium. Upon illumination by the light the medium is cooled.

The application discloses a low-pass high-absorption energy selective surface based on a meander structure, comprising a plurality of periodically distributed units, each unit sequentially comprising a frequency selective layer, a dielectric layer and an energy selective layer from top to bottom, the frequency selective layer comprising a first dielectric substrate and a plurality of metal meander structures and resistors on the upper and lower surfaces of the first dielectric substrate, the energy selective layer comprising a second dielectric substrate and a plurality of metal block structures and diodes on the upper surface of the second dielectric substrate, and the frequency selective layer and the energy selective layer being separated by the dielectric layer. The energy selective surface and the frequency selective surface of the application are impedance matched through the dielectric layer, when low-power electromagnetic waves are incident, a low-insertion-loss low-pass band is realized, and a wide absorption band is formed outside the band; when high-power electromagnetic waves are incident, a reflection band with high shielding effectiveness is realized in the working frequency band, and a wide absorption band is formed outside the band. The overall design structure principle of the application is simple and clear, and has a wide application prospect.

The invention discloses an in-situ ultraviolet hot-wet flue gas monitoring device, relates to the technical field of flue gas monitoring, and solves the problem that the original spectral analysis mode is not thorough due to the fact that characteristic analysis is not carried out aiming at an absorption peak and the characteristics are prominent. By combining length screening of the front characteristic wave band and the rear characteristic wave band of the absorption wave band, abnormal fluctuation caused by real absorption peaks of gas molecules, dust scattering and external interference can be effectively distinguished; when dust exists in flue gas, a trend peak can be identified as non-gas absorption interference through a verification value Ji after temperature regulation, a temperature verification interval is generated in real time through a temperature regulation and control end, the flue gas temperature is gradually regulated, characteristic absorption changes of gas molecules at different temperatures can be dynamically captured, absorption spectral line deviation caused by temperature fluctuation is eliminated, and the smoke quality is improved. And the amplitude error of the absorption peak is reduced to be within + / -5%.

The invention provides a spectrum selective absorption thermal control filler and a preparation method thereof, the chemical composition of the spectrum selective absorption thermal control filler is Ti < 1-x > MxO < 2-0.5 x >, M represents one or more of Gd, Yb and Ga, x is more than 0 and less than or equal to 0.5, and titanium dioxide and trivalent oxide powder are subjected to solid-phase synthesis in a high-temperature environment. Titanium oxide is doped with trivalent oxide, oxygen vacancies are introduced while lattice distortion is generated, lattice symmetry is reduced, carrier concentration is improved, an infrared absorption band is widened, low solar absorption ratio is kept while high emissivity is obtained, and selective absorption of spectrums is achieved; and the infrared emissivity at 600 DEG C can reach 0.80-0.85, the solar absorptivity is 0.20-0.35, and an excellent high-temperature heat dissipation effect is achieved.

The invention provides a hydrocarbon pollution detection method and device by coupling spectrum subtraction and characteristic T detection, and belongs to the technical field of environmental monitoring. The method comprises the following steps: acquiring target near infrared spectrum data of a to-be-detected area, determining corresponding background near infrared spectrum data according to the ground feature type of the to-be-detected area, and determining the target near infrared spectrum data according to the background near infrared spectrum data; the background near infrared spectrum data is reference spectrum data which is the same ground object as the to-be-detected target and is not polluted by hydrocarbons; performing subtraction processing on the target near infrared spectrum data and the background near infrared spectrum data to generate a difference spectrum; selecting a hydrocarbon characteristic absorption wave band and a reference wave band, and carrying out independent sample T inspection on the spectral value of the difference spectrum in the hydrocarbon characteristic absorption wave band and the spectral value of the difference spectrum in the reference wave band; and determining a hydrocarbon pollution detection result of the to-be-detected area based on the detection result. According to the method, background interference is eliminated through spectrum subtraction, an objective judgment standard is established by utilizing T test, and the scientificity and applicability of hydrocarbon pollution detection are improved.

The application discloses a kind of simultaneously generating 310nm and 355nm high-energy laser full solid-state ultraviolet laser, belongs to the technical field of laser.The frequency-doubled module of fundamental laser and it, intracavity sum-frequency module of optical parametric oscillator, sum-frequency module three parts, make full use of the output energy of 1064nm pulsed laser, adopt frequency conversion technology such as frequency doubling, optical parametric oscillation, sum-frequency, realize 310nm and 355nm ultraviolet pulsed laser output.The application has the advantages of multi-wavelength, high energy, high beam quality, compact structure, and the ultraviolet band is in ozone absorption band, especially suitable for the detection of troposphere and stratosphere atmospheric ozone concentration by spaceborne laser radar.

The invention discloses a cobalt ore prospecting method and system based on spectral absorption depth, and belongs to the new technical field of spectral prospecting methods and mineral product prediction. The method comprises the following steps: acquiring short-wave infrared hyperspectral data of a to-be-detected area to-be-selected research object through an image sensor and an intelligent sensing system, performing continuous spectrum removal processing, and extracting mechanism sensitive wave band absorption band depth parameters; constructing a cobalt ore spectrum diagnosis index based on the parameters, and performing inversion on the cobalt element enrichment intensity to form a continuous response field; introducing the response field into a space potential field model to carry out gradient analysis, and revealing enrichment abnormal space convergence characteristics; according to the method, multi-source response information is fused in combination with local space continuity constraints, intelligent identification, prediction, accurate positioning and quantitative exploration of cobalt mineralization abnormity under a complex geological background are realized, and the problem that a traditional remote sensing method is insufficient in ability of identifying concomitant class isomorphic hidden mineralization is solved; the method has the advantages of high recognition degree, accurate positioning prediction, accurate quantitative prediction, wide applicability and the like.

This application provides a method for synthesizing tetrapod-shaped HgTe quantum dots with sharp absorption band edges. The method includes: preparing a tellurium source solution of a first predetermined concentration; preparing a mercury precursor solution of a second predetermined concentration; injecting a predetermined volume of tellurium source solution into the mercury precursor solution using an injection pump at a predetermined injection rate to obtain a quantum dot solution; and growing the quantum dot solution for a predetermined time to obtain tetrapod-shaped HgTe quantum dots. This application synthesizes HgTe quantum dots using a simple injection pump method, with controllable injection rate, injection time, and other process conditions, and high reproducibility of the synthesis process.

Concentrations of individual hydrocarbons in a gas mixture are determined by measuring absorbance of mid-infrared radiation at specific wavelengths. Computation enables determination of concentrations of individual hydrocarbons despite overlaps of absorption bands.

The invention relates to a pyroelectric anti-interference detection method and a pyroelectric anti-interference detection device for characteristic decomposition products of mixed gas, and belongs to the field of insulating gas detection. Comprising the following steps: feeding sample gas into a chromatographic tower through carrier gas; the first product gas flows into a detection cavity through a buffer tank, the first concentration of the first product gas is obtained through carrier gas flushing, the second concentration of the first product gas is obtained through vacuumizing the detection cavity, and the third concentration of the first product gas is obtained through further carrier gas flushing; similarly, first to third concentrations of the second product gas and the third product gas are obtained; and respectively obtaining the final concentrations based on the first to third concentrations of the product gases. According to the method, different characteristic product gases are output to corresponding buffer tanks at different time intervals through chromatography, then sample gas is conveyed through carrier gas, and detection is performed through corresponding pyroelectric detectors, so that the problem that cross interference exists between the characteristic product gases and infrared absorption bands between the characteristic product gases and background gas when the characteristic product gases are directly detected by using a spectrum method is solved.