1049 results about "High reflectivity" patented technology

The invention discloses a glass lens surface scratch detection method and system, relates to the technical field of precision optical detection, and aims to solve the problems of scratch false detection, leak detection and poor algorithm adaptability caused by interference fringes, noise coupling and poor form adaptability in a high-reflection / complex coating process scene in the prior art. According to the scheme, an orthogonal polarization state composite light field is generated based on a multi-angle polarization light source array and a near-infrared compensation light source, and candidate regions are extracted through dynamic threshold segmentation and a direction gradient tensor matrix; gaussian pyramid multi-scale feature fusion and refraction angle consistency verification are utilized to eliminate artifact interference; constructing a direction constraint convolution kernel group to decompose scratches and background textures, and dynamically allocating computing resources in combination with a cascade network; feeding back closed-loop calibration light source wavelength and convolution kernel parameters in real time through coating parameters; according to the method, the precision and robustness of high-reflectivity surface scratch detection are remarkably improved, and meanwhile, the requirements for high-resolution image processing and real-time performance in a high-speed production line are balanced.

The invention provides a multi-camera fusion workpiece surface defect detection method and related equipment, and the method comprises the steps: employing a plurality of industrial cameras to carry out the video collection of the surface of a rotary body machined part, so as to generate the video data of the surface of the rotary body machined part; decoding the video data to obtain each frame of image in the video; cutting and splicing the obtained frame images to form an overall or local unfolded image of the workpiece surface; and performing image processing analysis on the expanded image to detect defects on the surface of the workpiece. In combination with flexible configuration of a plurality of industrial cameras, a high-speed video acquisition technology is adopted, and optical flexibility which is incomparable with that of a common line scanning camera is realized. The configuration not only adapts to various complex industrial scenes, but also has the characteristic of large depth of field, and can ensure that clear images can be obtained under different working distances. And the method has very strong universality for detecting the surface defects of the outer side wall of a metal rotary body machined part with a curved surface and high reflectivity.

The invention discloses a method for preparing a copper-chromium-niobium alloy high-thermal-conductivity part based on green laser SLM, and relates to the technical field of copper-chromium-niobium alloys. Comprising the following steps that copper-chromium-niobium alloy powder is pretreated; the pretreated copper-chromium-niobium alloy powder is laid on a base plate, green laser is adopted for selective laser melting printing, at least two layers of printing parameters with different energy densities are set in a layered energy gradient control mode, layered printing is carried out, a pore structure with the porosity in continuous gradient distribution is formed, and a pre-machined part is obtained; wherein the wavelength of the green laser is 500 nm to 550 nm, and the spot diameter of the green laser is 15 [mu] m to 30 [mu] m; and the pre-machined part is subjected to heat treatment, and the high-heat-conduction part is obtained. The copper-chromium-niobium alloy part is prepared through the green laser SLM technology, the layered energy density gradient control technology is adopted, and the problems that in copper-based alloy additive manufacturing, the reflectivity is high, the structure is limited, and the performance is insufficient are systematically solved.

The invention discloses an optical fiber Fabry-Perot sensor for detecting C4F7N gas and decomposition products thereof, belongs to the technical field of C4F7N gas detection, and solves the problem of how to improve the sensitivity of the optical fiber Fabry-Perot sensor for detecting the C4F7N gas and the decomposition products thereof. According to the optical fiber Fabry-Perot sensor for detecting the C4F7N gas and the decomposition products thereof, the Fabry-Perot cavity is formed by the interval between the end face of the single-mode optical fiber and the surface of the groove, emergent light of the single-mode optical fiber is reflected by the surface of the groove, the reflected light is converged by the groove, the loss of the reflected light is reduced, and the detection accuracy of the C4F7N gas and the decomposition products thereof is improved. Gold is uniformly sputtered on one surface of the groove of the sensing diaphragm device layer to form a layer of reflecting film, so that the reflectivity is further improved, reflected light is efficiently coupled into the single-mode optical fiber, the contrast ratio of a light interference peak is improved, and the detection sensitivity of the sensor is further improved; the sensor is simple in structure, small in size, high in reliability and capable of achieving high-sensitivity measurement of the C4F7N gas decomposition products.

The invention discloses a preparation method of an ultrahigh-reflectivity radiation refrigeration fiber membrane, which comprises the following steps: dissolving a polymer in an organic solvent to prepare an electrostatic spinning precursor solution, and adjusting parameters such as the concentration of the electrostatic spinning precursor solution, spinning voltage, spinning distance, roller rotating speed, liquid supply rate, slide rail reciprocating rate and the like to prepare the ultrahigh-reflectivity radiation refrigeration fiber membrane. And preparing the ultrahigh-reflectivity radiation refrigeration fiber membrane with a porous structure, wherein the reflectivity of the ultrahigh-reflectivity radiation refrigeration fiber membrane is greater than 95% at the sunlight wave band of 0.3-2.5 microns. In the dissolving process of the polymer in the organic solvent, the water bath stirring temperature is 20-60 DEG C, the stirring time is 3-6 hours, a bilateral multi-nozzle opposite layout is adopted in electrostatic spinning, the spinning distance is 15-30 cm, the electrostatic spinning voltage is 20-50 kV, the rotating speed of a roller is 400-1000 r / min, the spinning liquid supply rate is 8-30 ml / h, the reciprocating rate of a sliding rail is 3-10 mm / s, and the thickness of the ultrahigh-reflectivity radiation refrigeration fiber membrane is 300-500 microns. The radiation refrigeration film prepared through the method can be prepared in batches, has good flexibility and can be widely applied to the fields of clothes, buildings, equipment and the like.

The invention discloses a reflection-transmission mixed extreme ultraviolet collimation illumination system, and relates to the technical field of extreme ultraviolet optics. The system comprises a discharge plasma EUV light source, a multilayer film ellipsoid reflector and a collimating super lens. Wherein the discharge plasma EUV light source is used for generating radiation light in an extreme ultraviolet band; the multi-layer film ellipsoid reflector adopts an ellipsoid design, is plated with a high-reflectivity multi-layer film, is arranged on a transmission line of the discharge plasma EUV light source, and is used for focusing light beams of the light source; and the collimating super lens is arranged behind the focal position of the multi-layer film ellipsoid reflector and is used for collimating the focused light beams to form parallel light beams for Talbot photoetching illumination. The extreme ultraviolet illumination system is compact in structure, high in light beam energy and high in collimation, and the exposure quality in an application scene needing high-collimation extreme ultraviolet light beams is effectively improved.

The invention provides a SiO2 / TiO2 / PMMA radiation refrigeration film and a preparation method thereof, and relates to the technical field of passive daytime radiation refrigeration films. The radiation refrigeration film is prepared from the following raw materials: N, N-dimethylformamide, polymethyl methacrylate, silicon dioxide and titanium dioxide. The invention relates to a preparation method of a SiO2 / TiO2 / PMMA radiation refrigeration film. The preparation method comprises the steps of preparing silicon dioxide, preparing titanium dioxide, synthesizing composite sol and preparing the SiO2 / TiO2 / PMMA radiation refrigeration film. The SiO2 / TiO2 / PMMA radiation refrigeration film prepared by the invention has high reflectivity in the ultraviolet-visible-near infrared band and high emissivity in the infrared band, can realize 8.4 DEG C sub-environment refrigeration, and is low in cost and simple in process flow.

The invention provides a laser surface treatment method, device and equipment based on visual control, and the method comprises the steps: carrying out the energy waveform capture processing of pulse laser outputted by laser marking equipment, and carrying out the multi-channel visual detection of a surface reflection region of a to-be-marked part based on a pulse energy reference, and obtaining the surface feature information; planning an initial scanning path according to the surface feature information, and synchronously correcting a trigger time sequence of the pulse laser to obtain a target marking path; and in combination with the target marking path and the pulse energy reference, dynamic observation and local heat dispersion treatment are conducted on the marking area, and the treated part surface is obtained. The method is suitable for performing fine marking on a high-reflectivity or complex geometric surface, and can perform timely adjustment according to local temperature rise or optical characteristic change in the marking process to reduce depth unevenness and thermal damage.

The invention discloses a 2 [mu] m nanosecond pulse fiber laser and a time domain waveform adjustment method thereof. The laser comprises a seed source module and an amplification module connected with the seed source module. The seed source module comprises a first high-reflectivity fiber bragg grating, an acoustic optical modulator, a first beam combiner, a first thulium-doped fiber, a 2 * 2 coupler and a second high-reflectivity fiber bragg grating which are connected in sequence, as well as a driving source connected with the acoustic optical modulator and a first pumping source connected with the first beam combiner; the amplification module comprises an online isolator, a second beam combiner, a second thulium-doped optical fiber and an output jumper which are connected in sequence, and a second pumping source connected with the second beam combiner; the rising edge time and the starting time of the acousto-optic modulator are subjected to parameter setting through a human-computer interface of the driving source; the wavelengths of lasers output by the first pumping source and the second pumping source are both 793 nanometers. According to the invention, the multi-peak phenomenon of the Q-switched pulse laser of the 2um waveband can be conveniently and effectively eliminated, the performance of the laser is improved, and the application requirements of low cost and mass production are met.

The invention discloses a high-power intermediate infrared fiber laser. The fiber laser is composed of a first pumping source, a second pumping source, a pumping beam combiner, a high-reflectivity fiber grating, a low erbium-doped fluoride fiber, a low-reflectivity fiber grating, a cladding light filter, a fiber end cap, a collimating lens and a dichroscope. The mode of combining erbium ion ground state transition achieved through fiber core pumping and erbium ion excited state transition achieved through cladding pumping is adopted, mid-infrared laser upper energy level particle number accumulation is obtained, and meanwhile laser lower energy level particles are effectively consumed through the cladding pumping transition process. And the population inversion state of the laser system is kept, and the particle circulation rate and the quantum efficiency from the pump light to the intermediate infrared laser are improved, so that the generation of high-power and high-efficiency intermediate infrared fiber laser is realized.

The invention discloses a passive radiation refrigeration coating and a preparation method thereof, and relates to the technical field of industrial coatings. Comprising a fluoroacrylate emulsion, hollow glass beads, nano titanium dioxide, flaky silicon dioxide aerogel powder, polytetrafluoroethylene micro powder, hydroxyl-terminated polydimethylsiloxane, a hydroxyl acrylic acid modified silane coupling agent, a super-hydrophobic modified fluorosilicone surface additive, nano cerium oxide, aluminum fluoride doped zinc oxide infrared enhancement powder and deionized water. The paint is prepared on the basis of the formula. According to the invention, a multi-scale spectrum regulation and control and surface self-cleaning system is constructed cooperatively, so that the synergistic effect of high reflection of a sunlight region and high emission of a middle infrared region is realized. The coating can maintain continuous passive refrigeration in a day and night period, the surface of the coating has self-cleaning capability and excellent ultraviolet aging resistance, and high reflectivity and high radiation emissivity can be maintained for a long time in a complex outdoor environment, so that the thermal management efficiency of buildings and equipment is remarkably improved.

The invention provides a reflective thermal insulation coating based on three-dimensional porous resin as well as a preparation method and application of the reflective thermal insulation coating. The coating is prepared from the following raw materials in parts by weight: 15 to 60 parts of polymer resin emulsion, 1 to 15 parts of good solvent, 1 to 15 parts of poor solvent, 5 to 15 parts of reflective filler, 2 to 5 parts of nano kaolin and 1 to 5 parts of silicon dioxide aerogel. The reflective filler is hollow glass microspheres jointly modified by a silane coupling agent and titanium n-butoxide. The chemical reaction between the silane coupling agent and the surfaces of the glass microspheres can enhance the binding force between the silane coupling agent and the resin matrix, and avoids the problems of aggregation and sedimentation in the coating, thereby improving the uniformity and stability of the coating. Meanwhile, titanium n-butoxide is introduced, a TiO2 coating layer is generated through a hydrolysis reaction, heat can be effectively reflected through the high reflectivity of TiO2, heat absorption of the coating is reduced, and the heat insulation effect is improved. Therefore, the double-modified hollow glass microspheres can play a better heat insulation role in the coating, and the overall heat insulation efficiency of the coating is improved.

The invention discloses a multi-parameter C4F7N gas detection optical fiber Fabry-Perot sensor with a temperature compensation function, belongs to the technical field of C4F7N gas detection, and solves the problems that an existing optical fiber sensing instrument is low in sensitivity and single in application scene. When the sensor is in an environment with target gas, a detection result of the environment gas and a detection result of the temperature can be obtained, so that the application range of the sensor is widened; the gap between the end face of the single-mode fiber and the surface of the groove forms a Fabry-Perot cavity, emergent light of the single-mode fiber is reflected by the surface of the groove, the groove converges the reflected light, the reflectivity is improved, the reflected light is efficiently coupled into the single-mode fiber, the contrast ratio of a light interference peak is improved, and then the detection sensitivity of the sensor is improved. The sensor is simple in structure, small in size, high in reliability and capable of achieving high-sensitivity measurement of the C4F7N gas decomposition products.

The invention discloses a reflective steel pipe weld defect identification method based on a multimode spectrum chromatography technology, and provides a detection process of multiband reflection data acquisition, denoising and normalization, multi-region feature distribution modeling, sparse reconstruction separation abnormal response, multi-scale contrast weighted enhancement, significant layered imaging and defect classification and discrimination. According to the method, through the measures of automatic partitioning, environment and material dynamic acquisition, self-adaptive parameter optimization and the like, high-reflection interference is effectively suppressed, the distinguishing between defects and backgrounds is remarkably enhanced, and the detection sensitivity and the positioning precision of the small and micro defects are improved.

A mirror system comprising an EUV mirror (M1-M6), wherein the EUV mirror (M1-M6) includes a mirror body (38) and an optical surface (32) formed on the mirror body (38) with high reflectivity for EUV radiation. The mirror system comprises a frame structure (31) supporting the mirror body (38), a fluid channel (37, 58) for a temperature control fluid extending within a structural body (31, 38) of the mirror system, and a supply line (35) for delivering the temperature control fluid to the fluid channel (37, 58). The supply line (35) is provided with a temperature sensor (42) for the temperature of the temperature control fluid. The temperature sensor (42) is arranged outside the cross-section of the supply line (35). The invention also relates to a method for operating a mirror system and a projection lens of a microlithographic projection exposure system.

The present invention provides a method for analyzing the highest temperature experienced by an electrothermal alloy based on surface color. The 0Cr25Al5 electrothermal alloy and its products work in an air atmosphere and a high temperature environment. The surface is oxidized at high temperature to produce an oxide film. The higher the temperature, the faster the oxidation speed, and the thicker the oxide film thickness. The oxide film is extremely thin and dense, and can show interference colors. The color of the interference color is related to the thickness of the oxide film. After the 0Cr25Al5 electrothermal alloy and its products experience high temperature oxidation for a certain period of time, the thickness of the oxide film generated is related to the highest temperature experienced. The visible light reflectivity test using a spectrophotometer can obtain the visible light wavelength with the highest reflectivity. Substituting it into the formula given by the present invention, the highest temperature experienced by the 0Cr25Al5 electrothermal alloy and its products can be calculated. The advantages of the method of the present invention are: no need to prepare for the test in the early stage; no need to observe the 0Cr25Al5 electrothermal alloy and its products when they are working; non-contact type is adopted, and the surface of the test object is not damaged.

The invention provides a circuit board and a preparation method thereof and a backlight module, the circuit board comprises a circuit substrate and a reflection structure layer located on at least one surface of the circuit substrate, the reflection structure layer covers at least part of a circuit layer of the circuit substrate, and the reflection structure layer comprises a reflection layer and a transparent photosensitive layer which are sequentially stacked on the surface of the circuit substrate. The transparent photosensitive layer covers the outer surface of the reflecting layer. According to the circuit board provided by the invention, the surface of the reflecting layer is coated with the transparent photosensitive layer, so that the thickness and flatness of the reflecting structure layer can be improved, the light loss is reduced, the reflectivity and uniformity are improved, the lateral erosion size of the bottom of the reflecting layer is reduced, and the risk that the reflecting layer falls off is reduced.

The invention relates to the technical field of PDRC coatings, and discloses a novel super-hydrophobic PDRC coating with high mechanical strength. The coating can be prepared by a spraying process with large-scale production and low energy consumption. The PDRC coating is composed of poly (poly (GMA-co-FMA)) modified by a silane coupling agent (KH550) and SiO2 / TiO2 particles. By adjusting the mass ratio of SiO2 to TiO2 and the content of poly (GMA-co-FMA), the optimized PDRC coating shows the solar reflectivity of 91.06% and the emissivity of 93.72%, has the super-hydrophobicity of about 157 degrees, and effectively prevents dust attachment. In addition, the PDRC coating still keeps the reflectivity of 91.06% after 3,000 times of wear-resistant cycles of 250g load, which indicates that the PDRC coating has excellent mechanical durability. Due to the excellent optical performance, the surface temperature of the coating is reduced by about 13.2 DEG C, and the net cooling power of about 109.2 W / m is provided. The PDRC coating can be further processed into variants with different colors without influencing the high reflectivity and emissivity of the PDRC coating, so that the PDRC coating is suitable for practical application.

The invention provides high-reflectivity coated glass and a preparation method thereof. The high-reflectivity coated glass comprises a glass substrate, and an antioxidant dielectric layer, a reinforced dielectric layer, a metal layer and an outer dielectric layer which are sequentially arranged on the glass substrate, and the reinforced dielectric layer comprises a first dielectric layer and a second dielectric layer which are arranged in sequence. According to the coated glass provided by the invention, through specific dielectric layer structure combination, the reflectivity of the coated glass is improved, the transmittance is reduced, and the coated glass has good oxidation resistance, scratch resistance and heat-resistant processability, is simple in preparation process and has a wide application prospect.

The invention discloses a short pulse laser assisted continuous laser welding device and method. The method comprises the steps that materials are laid; a welding area is divided, and the whole welding area is divided into small areas; performing feature extraction on the small regions; constructing a speed mapping table according to the extracted different features; and planning a laser scanning path according to the speed mapping table. The short-pulse laser-assisted continuous laser welding device and method have the beneficial effects that near-infrared wavelength laser (such as 1064nm) is selected in the whole welding process, and the characteristics of high reflectivity of titanium alloy to the wavelength, high absorptivity of thermoplastic resin, relatively low absorptivity of a resin part in a thermosetting composite material and poor absorptivity of carbon fibers to the wavelength are utilized; laser energy is mainly concentrated on the thermoplastic resin layer, and local heating is achieved. The method comprises the following steps: dividing a region into small regions, extracting features, constructing a speed mapping table, controlling laser energy input, and reducing heat affected zones of the titanium alloy and the thermosetting composite material.

The invention discloses a fano resonance-based color radiation refrigeration film and a preparation method thereof, the film comprises a structure M1D1M2D1AD 'which are sequentially stacked from bottom to top, the structure of the film is an asymmetric structure, M1 represents a first metal layer, M2 represents a second metal layer, A represents an absorption layer, D1 represents a first dielectric layer, and D' represents a symmetrical dielectric layer unit of a film material; the M1D1M2 structure is in a discrete state and serves as a narrow-band light absorber, the M2D1AD'structure is in a continuous state and serves as a broadband light absorber, D 'serves as an antireflection layer in a continuous state, and the narrow-band light absorber and the broadband light absorber are coupled by sharing the second metal layer M2 to achieve fano resonance. The high-purity and color-adjustable reflection type structural color is achieved, the high reflectivity is achieved in the solar spectrum wave band, the high emissivity is achieved in the atmosphere window, and therefore the excellent radiation refrigeration effect is achieved.

The invention discloses a double-sided flexible solar cell and a preparation method thereof. The solar cell sequentially comprises a flexible semitransparent photovoltaic cell, a curved surface reflector and a flexible photovoltaic cell from top to bottom, wherein the flexible semitransparent photovoltaic cell sequentially comprises a packaging layer, a second transparent electrode, an electron transport layer, a light absorption layer, a hole transport layer and a first transparent electrode from top to bottom; the curved-surface reflecting mirror comprises a curved-surface substrate, a high-reflectivity metal layer and a weather-resistant protective layer from top to bottom in sequence. The flexible photovoltaic cell is one of a perovskite solar cell, an organic solar cell, a CIGS solar cell, a dye-sensitized solar cell, a monocrystalline silicon solar cell, an amorphous silicon solar cell, a cadmium telluride thin film solar cell and a quantum dot solar cell. The double-sided flexible solar cell provided by the invention can solve a series of problems that a traditional flexible solar cell is low in solar spectrum utilization rate, insufficient in photovoltaic and photo-thermal system collaboration, poor in complex curved surface adaptability and the like.

Disclosed are a micro-display chip and a preparation method thereof. The micro-display chip includes: a self-luminescence layer, a wavelength conversion layer, and a first transmitting-and-reflecting layer and / or a second transmitting-and-reflecting layer; the first transmitting-and-reflecting layer is disposed between the self-luminescence layer and the wavelength conversion layer; the second transmitting-and-reflecting layer is disposed on another surface of the wavelength conversion layer; the first transmitting-and-reflecting layer has low reflectivity and high transmissivity for the first color light and high reflectivity and low transmissivity for the second color light, and the second transmitting-and-reflecting layer has high reflectivity and low transmissivity for the first color light and low reflectivity and high transmissivity for the second color light. The micro-display chip of the present disclosure can effectively improve the absorbance and color purity of conversion light, thereby obtaining a brighter and purer conversion spectrum.

Provided are a chiral photosensitive molecular switch, a cholesteric liquid crystal composition, and a display panel and a preparation method therefor. The chiral photosensitive molecular switch has two stable states, and can be transformed from one stable state to the other stable state in response to light, and exist stably. The cholesteric liquid crystal composition comprises: the chiral photosensitive molecular switch, a bent-core molecule mixture, a rod-shaped single crystal mixture and a non-photosensitive chiral dopant; the cholesteric liquid crystal composition can be used to prepare a cholesteric liquid crystal display panel, the cholesteric liquid crystal comprising two stable states having different rotation directions, and being able to reflect light having different rotation directions. By adopting the strategy of light regulating the rotation direction of a cholesteric liquid crystal and an electric field regulating a reflection band, it is possible to obtain a cholesteric liquid crystal display panel having high reflectivity, high contrast and good stability, and which can be applied to electric field regulation of reflection in the full spectrum range.

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 provides a crystalline silicon solar cell and a preparation method thereof. The preparation method comprises the following steps: carrying out anisotropic corrosion treatment on a silicon wafer, and carrying out first texturing; carrying out isotropic corrosion treatment on the silicon wafer; and carrying out anisotropic corrosion treatment on the silicon wafer, and carrying out second texturing. According to the invention, after the first time of texturing, the silicon wafer is subjected to isotropic corrosion treatment, and the bottom of the textured pyramid is corroded, so that the small pyramid at the tower bottom is removed, and finally, the textured pyramid tower bottom is modified through the second time of texturing, so that the textured uniformity is improved, the reflectivity is reduced, and the photoelectric conversion efficiency of the solar cell is improved.

The invention provides a preparation method of a surface structure of a back contact battery, which relates to the technical field of back contact batteries, and comprises the following steps: S1, carrying out double-sided polishing on the surface of a silicon wafer: firstly carrying out rough polishing, removing a damaged layer on the surface of the silicon wafer, then cleaning with acid and ozone, then carrying out fine polishing, then cleaning with a mixed solution of hydrogen peroxide and alkali, and then carrying out acid pickling with ozone, then cleaning with a mixed solution of acid and hydrogen peroxide, and finally washing and drying; sequentially depositing a tunneling oxide layer and amorphous silicon on a single surface at high temperature; and performing high-temperature diffusion on the surface to form a crystallized first semiconductor region and a mask layer BSG. According to the invention, the specific suede structure is formed on the front surface, and the polished surface is formed on the back isolation base region, so that high reflectivity of the back isolation base region is ensured, the specific suede structure on the front surface can be independently designed, and meanwhile, a double-surface ozone oxidation process is added; therefore, the open-circuit voltage and the short-circuit current of the cell are improved, and the photoelectric conversion efficiency of the cell is improved.

The invention provides a radiation refrigeration plate combining a sky radiation refrigeration material and a plate heat exchanger, and relates to the technical field of refrigeration, the radiation refrigeration plate comprises a sky radiation refrigeration material layer, a plate heat exchanger assembly, a fan cover layer and a heat insulation material layer, the sky radiation refrigeration material layer has high reflectivity in a solar spectrum wave band and has high emissivity in an atmospheric window wave band, and the plate heat exchanger assembly has high reflectivity in a heat insulation material layer; and heat can be efficiently radiated to the outer space. The plate heat exchanger assembly comprises an enhanced heat exchange tube and a nanofluid, and the nanofluid is filled in the enhanced heat exchange tube and used for heat transfer and transport capacity and enhancing the heat exchange effect. And the fan cover covers the sky radiation refrigeration material. The heat insulation material layer is laid on the portion, except the top face, of the radiation refrigeration plate so as to reduce heat loss of the system to the surrounding environment, and the refrigeration effect is guaranteed. By means of the structure, working modes in the daytime and at night are achieved, the heat transfer efficiency of the system is greatly improved, energy consumption is reduced, and the efficient radiation refrigeration effect of all-weather continuous operation at the temperature lower than the environment temperature is achieved.

The present invention relates to the technical field of reflective film and discloses a reflective film for photovoltaic use and a preparation method thereof. The present invention prepares a four-layer composite structure, namely a protective layer, a reflective layer, a base layer, and an adhesive layer. Each layer is bonded together by a hot pressing composite process. Each layer has insulating properties. In addition, a modified EVA adhesive layer is used as a bottom functional layer, which has both strong adhesiveness and insulating properties. The prepared reflective film has excellent insulating properties, weather resistance, and high reflectivity, and has great application value in the field of photovoltaic reflective film.

An echo processing method and apparatus, relating to the field of LiDAR, and used for filtering interference noise generated by a target object having high reflectivity. The method comprises: determining from a plurality of pieces of statistical data first statistical data of which the frequencies are greater than a preset threshold value, each of the plurality of pieces of statistical data comprising a plurality of times of flight and a frequency corresponding to each of the plurality of times of flight, and the statistical data being data obtained by accumulating and counting the times of flight recorded in corresponding pixels (S802); according to first position information and a preset offset value, determining interference noise, the first position information being position information of first pixels corresponding to the first statistical data in an SPAD array, the interference noise being generated by a target object having high reflectivity, and the preset offset value being a preset position offset value of the first pixels in the transverse direction of the SPAD array (S803); and filtering interference noise in the plurality of pieces of statistical data, so as to obtain target data (S805).