90 results about "Solar spectra" patented technology

The invention belongs to the field of composite materials, and particularly relates to a nanofiber radiation refrigeration heat insulation film with a bionic multilayer structure. The device sequentially comprises a bionic anti-reflection layer, a solar spectrum reflection layer, a nanofiber porous heat insulation layer and an atmospheric window radiation layer from outside to inside, the bionic anti-reflection layer is a sub-wavelength nano bulge array simulating a moth eye structure and is formed on the outer surface of the solar spectrum reflecting layer; the solar spectrum reflecting layer is a polymer film doped with high-reflectivity nanoparticles; the nanofiber porous heat insulation layer is a porous membrane formed by interweaving polymer nanofibers prepared by an electrostatic spinning technology; the atmospheric window radiation layer is a functional layer formed by coating or blending high-emissivity inorganic nanoparticles on the inner surface of the nanofiber porous heat insulation layer; the film integrates bionic antireflection, high sunlight reflection, efficient heat radiation and physical heat insulation, and efficient, stable and flexible daytime radiation refrigeration is achieved.

The invention discloses a TEC photo-thermal stable thermoelectric power generation device and a preparation method thereof, and relates to the technical field of thermal power generation, and the TEC photo-thermal stable thermoelectric power generation device comprises an energy capture module, a thermoelectric power generation module and a dual-mode heat dissipation module which are sequentially arranged from top to bottom; the energy capture module comprises a silicon substrate with a micro-cone array on the surface, a phase change energy storage buffer dielectric layer coated on the surface of the micro-cone array, and a silicon carbide film layer, a titanium nitride film layer and a titanium nitride nanoparticle layer which are sequentially arranged on the surface of the phase change energy storage buffer dielectric layer; the thermoelectric power generation module comprises a corrugated metal composite substrate and a plurality of thermoelectric units arranged on the surface of the metal composite substrate. The bottleneck that a traditional single material is insufficient in solar spectrum coverage is broken through, the solar energy utilization efficiency is greatly improved, excessive heat generated by sudden change of instantaneous illumination intensity can be effectively absorbed, and continuous and stable heat source input is provided for thermoelectric conversion.

The invention discloses an on-orbit spectrum precision test method and equipment for an ultraviolet hyperspectral remote sensor, and the method comprises the steps: selecting a high-resolution reference solar spectrum higher than the spectral resolution of the ultraviolet hyperspectral remote sensor, and calculating a reference standard solar spectrum according to the high-resolution reference solar spectrum; establishing a reference wavelength library according to the reference standard solar spectrum of the ultraviolet band, and selecting a standard absorption line meeting conditions as a reference wavelength; screening an absorption peak center position of the observation spectrum, finding an absorption peak center closest to the reference wavelength in combination with the reference wavelength library, and constructing a peak searching database of the absorption peak center of the discrete spectrum; and calculating a difference value between the central wavelength calculated according to the peak searching database and the corresponding reference wavelength to obtain the spectrum calibration precision of the ultraviolet hyperspectral remote sensor. According to the method, the precision difference of the spatial dimension can be identified, the distribution of the overall system deviation is quantified, and reliable support is provided for on-orbit precision verification and performance optimization of the ultraviolet hyperspectral remote sensor.

The invention relates to the technical field of radiation refrigeration films, and discloses a porous polyvinylidene fluoride based composite radiation refrigeration film and a preparation method thereof. The method comprises the following steps: firstly, carrying out melt blending on PVDF, NaCl and ZnO nanoparticles and forming a film, then dissolving out NaCl through water washing, and constructing a continuous three-dimensional porous structure in a PVDF matrix; and immersing the obtained porous PVDF / ZnO membrane material into a methanol aqueous solution containing 2-methylimidazole, so that ZnO is subjected to a coordination reaction at the pore wall and is converted into the ZIF-8 nanocrystal in situ. In the thin film prepared by the steps, the micron-sized salt-induced pore structure, the nano-sized ZIF-8 particles and the interface of the ZIF-8 particles jointly form a multi-stage scattering network, so that the scattering ability of the thin film in the solar spectrum range of 0.25-2.5 microns can be remarkably enhanced, the high infrared emission performance of the PVDF matrix in an atmospheric window of 8-13 microns is maintained, and the thin film has high solar reflectivity and high infrared emissivity, and can be used for preparing the solar film. An excellent radiation refrigeration effect can be achieved, and the heat-dissipating material is suitable for being applied to building outer surfaces, equipment heat dissipation, individual heat management and the like.

The embodiment of the invention provides a remote sensing image atmospheric correction method and system for an ocean near-shore scene, and relates to the technical field of ocean remote sensing image atmospheric correction. According to the method, after remote sensing data is obtained, solar flare correction is executed by extracting a target mask and using a secondary simulation model of a satellite signal in a solar spectrum. And then a multi-band darkness index is calculated, and an optimal aerosol optical thickness value is inverted through a radiation transmission model. And calculating the atmospheric correction coefficient of each wave band according to the optimal aerosol optical thickness value so as to generate correction result data. According to the method, on the basis of robust flare correction of the SWIR proxy, scene-adaptive flare proxy is constructed by utilizing water body reflection and path radiation physical characteristics of the SWIR under a deepwater condition, and flare deduction is realized. Inversion is carried out through multiband combined darkness indexes, and the spectral characteristics of the deep water body reflected in the visible spectrum are utilized, so that single-band random noise is smoothed, and the accuracy of an AOT estimation result is improved.

The present disclosure provides a film for enhancing the growth of plants in the Cannabaceae family, the film being capable of blocking solar spectrum in the range 430-550 nm. The present disclosure also provides a single- or multi-layer plastic greenhouse film for enhancing cannabis plant growth, where the single- or multi-layer plastic greenhouse film (a) has at least one blue light blocking layer for blocking solar spectrum in the range of 430-500 nm; (b) has a high transmittance for red light in the solar spectrum in the range of 600-750 nm.

The invention provides an under-forest light spot space-time distribution simulation method and system based on anisotropic probability volume fraction, and the method comprises the steps: obtaining laser radar point cloud data of a target forest stand, and carrying out the preprocessing, and generating a standardized point cloud; constructing a forest probability density field: dividing a forest stand space into voxel grids, and for each non-empty voxel containing vegetation, extracting spatial distribution statistical characteristics of internal point clouds of the non-empty voxel and calculating an anisotropic extinction coefficient of each non-empty voxel; the method comprises the following steps: simulating the sun as a surface light source with a preset angular diameter, emitting light from an under-forest preset observation point to the surface light source, executing probability volume fraction light stepping in a forest probability density field, and obtaining the optical thickness by accumulating anisotropic extinction coefficients of all non-empty voxels on a light propagation path. And then calculating the transmittance of the light reaching the observation point, integrating the solar spectrum irradiance in a wave band and a time period corresponding to the photosynthetically active radiation, and generating a spatial-temporal distribution map of the photosynthetically active radiation under the forest.

This application provides a machine learning-based method and system for optimizing the photothermal conversion efficiency of solar desalination in seawater. The method includes: firstly, collecting solar spectral distribution data, seawater turbidity spectral data, real-time heat flow data, and semiconductor nanomaterial data for the target sea area; and constructing a material spectral mapping library based on the light absorption characteristics of the nanomaterials. By coupling analysis of the solar spectrum and seawater turbidity spectrum to form environmental constraints, a Bayesian optimization model is used in conjunction with the material spectral mapping library and real-time heat flow data to generate the optimal nanomaterial mixing ratio under these constraints. Subsequently, a deep residual network is used to predict the interfacial evaporation rate and obtain the optimal material morphology configuration scheme, which is finally applied to the preparation of semiconductor nanomaterials. This application improves the photothermal conversion efficiency of solar desalination systems in high-turbidity seawater environments.

The application provides a high-thermal-conductivity heat dissipation integrated composite heat control film for satellites, which comprises a protective layer, a nano heat control film and a graphite film. The nano heat control film comprises a protective layer based on the surface of the film and a three-dimensional micro-nano structure, the graphite film is packaged by hot melt adhesive and is pasted together with the nano heat control film by the hot melt adhesive to form a new high-thermal-conductivity heat dissipation integrated composite heat control film. The application is pasted on the outer surface of a satellite cabin plate or an antenna and the like by silicone rubber, so that the outer surface of the satellite has the characteristics of high reflectivity to the solar spectrum, high emissivity to the infrared spectrum and high thermal conductivity, the uniformity of the temperature field of the whole satellite is improved, the reliability of the single machine in the cabin is improved, the production cycle of the product is short and the product is convenient to implement. The application solves the problems of high heat flux density, complex illumination components and rapid development of future low-orbit satellite constellations, the production cost is significantly reduced, and the commercial batch production of the satellite constellations is facilitated.

This invention discloses a superhydrophobic radiation-cooling polymer coating, its preparation method, and its application. The coating is white and possesses a bicontinuous micro / nano porous structure. It is prepared by a ternary copolymerization reaction of polyurethane acrylate oligomers, acrylate reactive diluents, and vinyl siloxane porogens. The method involves initiating free radical polymerization of monomers in the porogen under ultraviolet light, inducing rapid phase separation, and naturally evaporating the porogen to obtain the coating. This coating exhibits superhydrophobicity without post-treatment, virtually no absorption in the solar spectrum, and near-100% emissivity in the mid-infrared window. Furthermore, the optical properties and superhydrophobicity of the coating are minimally affected by long-term ultraviolet irradiation, thermal aging, acids, and alkalis. This coating can be applied over large areas in high-performance radiation-cooling applications.

The invention discloses a purple phosphorus-based monatomic catalyst for efficient hydrogen evolution and a preparation method of the purple phosphorus-based monatomic catalyst, and belongs to the technical field of catalysts. The preparation method comprises the following steps: treating block purple phosphorus by a liquid-phase ultrasonic stripping method to obtain a purple phosphorus precursor serving as a carrier; mixing a platinum salt solution with the purple phosphorus precursor to form a mixed solution; and carrying out irradiation treatment on the mixed solution by adopting a standard solar spectrum, so that platinum ions in the platinum salt are reduced and anchored on the purple phosphorus precursor in a monatomic form, thereby obtaining the purple phosphorus-based monatomic catalyst. The whole technological process only relates to common raw materials such as purple phosphorus and trace platinum salt, operation is easy and convenient, cost is low, and product purity is high. According to the method, the monatomic catalyst with a clear structure is successfully constructed through ingenious process design by utilizing the confinement effect of purple phosphorus and the synergistic effect of photoreduction, and a solid foundation is laid for the monatomic catalyst to show high catalytic activity and excellent stability in a hydrogen evolution reaction.

The invention relates to a biomass-based radiation refrigeration fireproof composite material and a preparation method thereof, and belongs to the technical field of macromolecular fireproof composite materials. In order to solve the problem that an existing fireproof coating cannot give consideration to both thermal management and fireproof performance, the invention provides a biomass-based radiation refrigeration fireproof composite material which comprises magnesium-aluminum hydrotalcite powder, cellulose nanofibers and a hydrophobic adhesive. According to the invention, a brick-mud hierarchical structure with a shell-like structure is constructed through electrostatic self-assembly, and the mechanical strength and toughness of the material are improved. The optical performance is improved through a multi-stage scattering interface constructed through CNF, and the solar spectral reflectivity is as high as 95.6%. The emissivity of the atmosphere window wave band reaches 94.9%, the radiation refrigeration power reaches 138.54 W / m < 2 >, and the thermal management performance is far better than that of a traditional fireproof coating. The inherent flame retardant property of Mg-Al LDH is combined with the enhancement effect of CNF, so that the material is endowed with excellent flame retardant property and good thermal stability.

The invention discloses a polar axis type solar direct radiation spectrum measurement method and system, belongs to the technical field of solar direct radiation spectrum measurement, and aims to solve the problems that an existing measurement system depends on complex double-axis tracking, has many errors, is high in maintenance cost and is insufficient in latitude adaptability. The system comprises a polar axis rotating reflector and a solar spectrum measurement system, the polar axis rotating reflector directly radiates and reflects the sun with the solar elevation angle of + / -23.5 degrees and the solar azimuth angle of + / -90 degrees to the measurement system, and measurement is achieved in combination with a spectrum reconstruction model. The spectral resolution is superior to 2 nm, the single-point error ranges from-6.83% to 6.61%, the area error ranges from-0.03% to 0.05%, the space-time uniformity is larger than or equal to 99.92%, the structure is simplified, all-year-round all-latitude high-precision measurement without moving tracking is achieved, and the method is suitable for the fields of solar energy development, climate change research and the like.

The invention discloses a solar spectrum unmixing and beam combining method based on grating inverse dispersion, relates to the technical field of solar spectrum simulation, and solves the problems of low energy utilization rate, poor spectrum coincidence and difficulty in wide spectrum matching in traditional beam combination. The method comprises the following steps: carrying out discrete sampling on an AM0G / AM1.5 G spectrum, selecting a plurality of narrow-band LEDs as reconstruction units, and solving a weight coefficient by a least square method to realize spectrum unmixing; the light is condensed to a grating through a focusing lens, inverse dispersion beam combination is carried out according to a grating equation, and a divergence angle is corrected to 0.733 degrees / 0.814 degrees through a cylindrical shaping lens; and evaluating the quality through SD, SMSR and light spot overlap ratio. The spectrum matching error is smaller than or equal to 5.89%, the light spot overlap ratio is 95.42%, double spectrums can be switched, and the method is suitable for high-precision spectrum beam combination of the solar simulator.

The invention relates to the technical field of photothermal conversion materials, in particular to a total solar spectrum absorption type triarylamine cation free radical system. The organic triarylamine cation free radical shows excellent stability, has a narrow-band gap characteristic, and can efficiently absorb light energy in the whole solar spectrum range by combining with a unique intervalence charge transfer effect, so that the light energy in the whole solar spectrum range can be effectively absorbed, and the light energy in the whole solar spectrum range can be effectively absorbed. The free radical material can quickly convert light energy into heat energy through an ultrafast non-radiative transition process, and shows excellent solar photo-thermal conversion performance.

The application provides a spectrum bending correction method, system and medium, relates to the fields of spectral imagers and satellite remote sensing technology, and comprises the following steps: S1, selecting a solar spectrum image as sample data for spectrum bending correction, and performing curve fitting on the sample data; S2, calculating the bending degree of each column of a to-be-corrected image according to the fitted curve; and S3, correcting each column of the to-be-corrected image by using the time shift property of Fourier transform according to the bending degree of each column, completing the correction of all column data, and obtaining complete corrected spectrum image data. The application can not need to increase the design and manufacturing difficulty of a spectral element or a slit, not need complex calculation, only use the time shift property of discrete Fourier transform to process image data, and simply and intuitively complete spectrum bending correction.

The invention discloses an efficient laminated fluorescent solar concentrator based on environment-friendly quantum dots, and belongs to the technical field of solar photoelectric conversion. According to the condenser, an upper layer structure and a lower layer structure are physically attached to form an optical coupling laminated design, wherein the top layer uses environment-friendly carbon quantum dots for absorbing visible light of 300-500 nm as a light-emitting material; and the bottom layer adopts copper-based ternary quantum dots of which the absorption range covers ultraviolet light to near-infrared light. The invention also provides a preparation method of the condenser. The structure not only realizes wide-range efficient absorption and fluorescence convergence of solar spectrum, but also has the characteristics of environmental friendliness and no heavy metal toxicity. Under AM 1.5 G standard illumination, the highest photoelectric conversion efficiency of the laminated condenser reaches 4.48%, and the laminated condenser has excellent stability and environmental protection compatibility and is suitable for building windows, vehicle skyscreens and other scenes.

The utility model relates to the technical field of environmental simulation test equipment, in particular to an angle-adjustable solar spectrum filter for a test box, which comprises a filter body and a base frame, the upper end and the lower end of the back side of the base frame are respectively provided with a connecting corner bracket, and a transverse driving mechanism composed of a displacement push plate, a guide rod and a guide sleeve is arranged in each connecting corner bracket. The device comprises a base frame used for accurately controlling the horizontal transverse position of the base frame, the outer side of the base frame drives a rotating support through a rotating motor, an angle changing roller is arranged in the rotating support, supporting blocks are arranged at the upper end and the lower end of the outer side of the angle changing roller, and the outer sides of the supporting blocks are connected with fixing lugs used for being connected with and installing a filter body. According to the solar spectrum filter with the adjustable angle for the test box, the illumination angle can be flexibly adjusted, different illumination conditions can be conveniently simulated, and the experiment efficiency and the data accuracy are improved.

The invention relates to the technical field of environment monitoring, in particular to a point source plume influence point identification method based on concentration distribution. According to the technical scheme, the method comprises the following steps: carrying out underway observation around an emission point source, collecting solar spectrum and position information at the same time, carrying out inversion to obtain the concentration of a target gas column, and calculating the average mole fraction of a dry air column; generating a concentration distribution diagram by combining the position information, identifying a concentration background area according to the distribution characteristics, and determining a background concentration baseline and a variation amplitude; based on the background change amplitude and the observation uncertainty, setting a plume influence point judgment threshold value, calculating a concentration enhancement value of each point relative to the background, and if the enhancement value exceeds the threshold value, judging that the point is a plume influence point; and determining the range of the plume influence zone based on the spatial distribution of the plume influence points. According to the method, the plume influence area can be accurately identified under the condition that wind field data cannot be obtained or errors are obvious, and the reliability of emission flux estimation is effectively improved.

The invention discloses a spectrum-space coordinated regulation multispectral stealth device. The device structurally comprises an infrared selective radiation layer, a retroreflection structure layer and a microwave absorption layer from top to bottom in sequence, the infrared selective radiation layer has the transmissivity of more than 0.5 in a solar spectral band, the radiance of the infrared selective radiation layer in an infrared atmospheric window is lower than 0.5, and the radiance of the infrared selective radiation layer in an infrared non-atmospheric window is higher than 0.5; the reflectivity of the retroreflection structure layer to the solar spectrum wave band is higher than 0.6, and the final emergent light and the incident light are parallel but opposite in direction. The device provided by the invention can simultaneously realize visible light / short wave infrared stealth, infrared stealth and heat dissipation optimization, and a multiband compatible function of microwave stealth.

The invention discloses a neodymium plasma light source, and belongs to the technical field of plasma light sources, and the neodymium plasma light source comprises a magnetron which is used for generating microwaves; the microwave resonant cavity is in a semi-elliptic cylinder shape, a reflective mirror and an electrodeless discharge lamp tube are arranged in the microwave resonant cavity, and the electrodeless discharge lamp tube is filled with neodymium halide, tin halide, sodium halide and starting gas; one end of the waveguide tube is connected with the magnetron, and the other end of the waveguide tube is connected with the microwave resonant cavity; the color rendering index of the neodymium plasma light source is better than 95, the correlated color temperature is about 6000 K, and a spectrum curve is characterized in that a peak value appears around 480 nm and is similar to a solar spectrum.

The invention relates to the technical field of automobile films, in particular to a solar spectrum sub-band control type transparent energy-saving film and a preparation method thereof.The solar spectrum sub-band control type transparent energy-saving film is prepared from, by mass, 62-73 parts of thermoplastic polyurethane elastomer, 16-21 parts of polyethylene glycol terephthalate, 5-10 parts of functional auxiliary material C and 5 parts of functional additive; the functional auxiliary material C is prepared from the following raw materials in parts by weight: 60 to 68 parts of polyethylene glycol terephthalate, 15 to 20 parts of polyphenyl ring grafted polyalkyl compound, 5 to 10 parts of nano S SO2, 3 to 8 parts of ultraviolet high-absorption nano metal oxide and 2 to 3 parts of high-reflection metal oxide. The automobile body film has a good heat insulation function, and can effectively control infrared rays, shield ultraviolet rays, increase the permeability of visible light and reduce energy conversion of solar radiation energy on the surface of an automobile body, so that a good energy-saving effect is achieved.

The invention discloses a radiation refrigeration composite coating agent as well as a preparation method, application and fabric thereof. The composite coating agent comprises a fluorine-containing polymer and an inorganic filler, wherein the fluorine-containing polymer is coated on the surface of an inorganic filler microsphere in the form of nanoscale particles; the inorganic filler is micron-sized spherical particles, and has high reflectivity and high refractive index in visible light and near-infrared bands. The inorganic filler with high reflectivity and high refractive index in visible light and near-infrared bands and the polymer resin material with a strong mid-infrared emission function are introduced into the composite coating agent, so that the coating is endowed with strong mid-infrared emission characteristic, and the coexistence form between the polymer resin and the inorganic filler is regulated and controlled, so that the polymer resin and the inorganic filler generate a multi-stage interface, and the coating has a good anti-reflection effect. And sufficient diffuse reflection can be provided to realize a more perfect reflection function. The super-strong synergistic effect of reflection of a fabric coating in a solar spectrum wave band and infrared emission in an atmosphere transparent window position is realized by utilizing the composite coating agent, and the preparation of the super-strong radiation refrigeration composite coating fabric is realized.

A light-emitting plasma lamp bulb for solar ultraviolet simulation includes a bulb cover having a spherical shape or a rod shape through which ultraviolet rays are transmittable, discharge gas contained in the bulb cover, and a first light-emitting material and a second light-emitting material, wherein the first light-emitting material includes at least one of mercury (Hg) and mercury iodide (HgI2), and the second light-emitting material includes sulfur (S8), wherein light emitted from the bulb has a maximum optical power intensity in a range of 395 to 455 nm which is an ultraviolet-visible boundary region, wherein, when compared using a same ultraviolet dose in an ultraviolet region of 290 to 400 nm, an integrated intensity of a visible and infrared region of 400 to 850 nm is equal to or less than ⅕ of an integrated intensity of a visible and infrared region of a standard solar spectrum (ASTM G173, AM 1.5G).

The present application relates to a kind of preparation methods of non-iridescent structural color film with infrared anti-fake features. First, the aqueous solution of monodisperse microspheres is configured, then a small amount of MXene and carbon black material is added, and a mixed colloidal particle suspension is obtained. By using spray, spin coating or roll coating method, three-dimensional amorphous photonic crystal film is formed on the surface of the substrate by rapid evaporation of solvent. The black material absorbs light and scatters multiple times in the amorphous photonic structure, improving the color quality of the amorphous photonic crystal film and showing good non-iridescent structural color display. By using the better absorption in the solar spectrum and the extremely low emissivity in the mid-infrared band of MXene material, as well as the optical characteristic difference with carbon black and other materials, the structural color film realizes the thermal anti-fake property. After micro-heating, the hidden information can be read by an infrared camera.

The application belongs to the technical field of photothermal conversion materials, and particularly relates to a photothermal conversion coating, a preparation method thereof and a photothermal conversion device. The preparation method of the photothermal conversion coating comprises the following steps: obtaining a porous substrate, adsorbing an initiator in the porous substrate in situ to obtain a modified porous substrate, and performing a gas phase polymerization reaction on the modified porous substrate with a conjugated polymer monomer and a chlorine source to form a chlorine-doped photothermal conversion coating on the surface of the porous substrate in situ. In the preparation method of the photothermal conversion coating, the initiator is adsorbed in the porous substrate in situ, and the conjugated polymer monomer is diffused in the form of gas on the surface layer of the substrate, so that the monomer is polymerized in the pores of the substrate in situ, and the combination firmness of the coating and the substrate is improved. Meanwhile, the structuralization and doping effects improve the utilization rate of the coating to light energy, so that the photothermal conversion coating has the characteristics of high solar spectrum absorption efficiency, wide light absorption range, high absorption degree and high utilization rate, and exhibits super strong photothermal effect.

The invention discloses a lignin radiation cooling material and a preparation method and application thereof. The material is prepared by using light-color lignin and polyvinyl alcohol as matrixes, constructing frozen gel with a layered porous structure through a directional freezing technology, and growing silicon dioxide nanoparticles in pores of the frozen gel in situ. The preparation method comprises the following steps: mixing the light-color lignin with a polyvinyl alcohol solution, performing directional freezing and freeze-drying to form a porous skeleton, performing crosslinking treatment to enhance the stability, and finally performing in-situ generation of the silicon dioxide nanoparticles in an ethanol system under the catalysis of ammonia by taking tetraethyl orthosilicate as a silicon source. According to the method, the intrinsic infrared emission characteristic of lignin, the light scattering capacity of a porous structure and the high reflection performance of silicon dioxide are ingeniously combined, so that the obtained material has high reflectivity in the solar spectrum band and has high emissivity in the atmosphere window band, passive radiation cooling without external energy is achieved, and the service life of the material is prolonged. And a remarkable cooling effect can be generated in a noon strong light environment. The material provides a new solution for the fields of high-valued utilization of biomass resources and energy-saving cooling.