45 results about "Visible band" patented technology

The invention relates to the technical field of carbon detection, in particular to an online real-time dynamic detection method for the carbon content of converter steelmaking molten steel, which comprises the following steps: acquiring multi-source sensing data, and acquiring a molten steel surface temperature image acquired by a thermal infrared imager; acquiring multiband spectral data, namely controlling a visible band sensor to acquire radiation intensity in a range of 500-600nm, and controlling a near-infrared band sensor to acquire reflectivity characteristics in a range of 850-1100nm; analyzing and fusing the data, analyzing the temperature image, and generating a molten pool two-dimensional temperature field; analyzing the multiband spectral data, and extracting a spectral feature vector related to the carbon content; fusing the two-dimensional temperature field and the spectral feature vector, and generating a molten steel surface carbon content distribution diagram based on a pre-trained carbon content machine learning model; and outputting an optimized detection result, processing multi-node data through a distributed computing framework, and outputting a dynamic carbon content detection report. According to the invention, the effects of breaking through the limitation of traditional static detection, real-time component monitoring, full molten pool covering and dynamic feedback are achieved.

The invention discloses a perovskite-based visible-near infrared photoelectric detector array and a preparation method thereof. The perovskite-based visible-near infrared photoelectric detector array comprises a substrate, an up-conversion particle / perovskite heterostructure and an electrode layer, wherein the up-conversion particle / perovskite heterostructure is arranged on the substrate; the heterostructure comprises a perovskite layer arranged on the substrate, the perovskite layer is composed of a plurality of perovskite micro-nanowires in one-dimensional linear arrangement, and an up-conversion material layer wraps the two transverse sides of the perovskite micro-nanowires from the side wall to form an up-conversion particle / perovskite structure; the absorption spectrum of the up-conversion material comprises a near-infrared band, and the emission spectrum is partially or completely matched with the absorption spectrum of the perovskite layer material. The detector array widens the absorption range of the perovskite to the near-infrared band under the condition that the inherent visible band detectability of the perovskite is not influenced, the up-conversion material absorbs near-infrared light and emits light in the visible band, the light can be effectively absorbed by the perovskite and generates electron hole pairs, and the photoelectric conversion efficiency is improved. Energy absorption and detection of the perovskite-based photoelectric detector from a visible spectrum section to a near infrared spectrum section are realized.

The invention discloses a method for improving optical storage capacity based on ultraviolet femtosecond laser multi-cycle low-temperature direct writing, and belongs to the technical field of laser processing. Leveling the sample table; designing a random data structure and calculating parameters; preparing a random data structure; reading and characterizing a random data structure; according to the method, firstly, ultraviolet femtosecond laser with the wavelength of 343 nm is used for replacing infrared / visible band laser used in traditional five-dimensional optical storage, secondly, a multi-cycle scanning mode is used for replacing an existing scanning mode, and birefringence modification with the smaller size is induced in quartz glass at low temperature; the tiny birefringence modification is used for realizing data writing and reading of the optical memory with higher storage density; according to the multi-cycle scanning mode, heat accumulation in the machining process is affected by changing single-point one-way acting time, so that the dot spacing is shortened, and the storage capacity is increased.

The invention provides a dynamic polarization three-dimensional imaging system, which relates to the technical field of anti-counterfeiting encryption and comprises a light source, a polarization film and a color three-dimensional imaging module which are sequentially arranged along a light path, the light source is used for providing visible band incident light; the polarizing film is configured to transmit TM polarized light when rotating 0 degree and transmit TE polarized light when rotating 90 degrees; the color three-dimensional imaging module comprises a micro lens array, a transparent spacing layer and a micro image-text array which are sequentially arranged along a light path; the micro image-text array comprises a metal coating layer, a grating layer and a glass substrate which are stacked from top to bottom, wherein the grating layer forms a Fabry-Perot-like microcavity resonance structure; the polarization state of the incident light is switched by rotating the polarization film, so that the stereo image of the micro image-text array is dynamically switched among an appearing state, a hiding state or a color changing state. According to the invention, wide-color-gamut and dynamically-adjustable color stereo imaging is realized, and the complexity and the identifiability of anti-counterfeiting encryption are improved.

The invention discloses a tunable narrow-band medium-wave infrared detection method based on up-conversion, and the method mainly comprises the steps: building a tunable narrow-band medium-wave infrared detection system, adjusting the power of signal light and pump light and the size of a beam waist, and controlling the temperature of a nonlinear crystal at a room temperature level to suppress the noise of a static system. A nonlinear crystal is designed through displacement of a multi-polarization period of a mechanical motion module, so that quasi-phase matching of signal light and pump light in a range of 3-5 microns is realized in different polarization period channels, sum frequency light of a visible wave band is generated, and flexible tuning of the signal light in a wide spectral range is realized; after stray light is filtered out, a sum frequency signal is received by a detector, a corresponding curve is obtained according to detected intensity information corresponding to each wavelength, and narrow-band response characteristics of different polarization periods are obtained.

The invention discloses a self-reference three-phase polarization imaging system and method based on an integrated photon neural network, and the method comprises the steps: setting a fixed phase difference in a silicon-based photon chip to achieve three-phase projection and single-port reading, outputting a three-phase interference signal at the same time, obtaining all phase and polarization information in one-time imaging to achieve full-polarization measurement, and carrying out the single-port reading of the silicon-based photon chip; according to the invention, the effective resolution ratio is consistent with that of an original detection array, power and temperature drift is eliminated, single-frame acquisition has no time sequence error and motion artifact, a stable and compact single-port self-reference reading mode is realized through a three-phase interference measurement architecture constructed on a chip in combination with channel normalization and rotation correction, and complete Stokes parameters and polarization information can be measured. According to the system provided by the invention, the MZI is adopted, so that the phase bias can be flexibly adjusted, and different bandwidth requirements can be met by adjusting an interference path. The silicon-based photon platform has a broadband response characteristic and can cover a visible wave band, so that the device can keep stable interference performance in a communication wave band.

The invention relates to the technical field of meteorological data processing, and discloses a meteorological satellite data processing method based on deep learning, and the method comprises the steps: 1, obtaining multi-modal meteorological satellite data which comprises infrared band data, visible light band data, multispectral band data, auxiliary ground observation data and meteorological radar data; and step 2, denoising the meteorological satellite data through a convolution auto-encoder. By designing a cross-modal self-attention mechanism, features of infrared, visible light and multispectral data are interactively fused, complementary information among different data sources is fully mined, deep feature expression of multimodal meteorological satellite data is realized, the problem that a single data source is difficult to comprehensively characterize a complex meteorological phenomenon is solved, and the accuracy and the reliability of the meteorological satellite data are improved. The effect of remarkably improving the perception ability of the model to complex meteorological phenomena is achieved, the collaborative analysis ability of multi-modal data is improved, and higher precision and robustness are provided for meteorological prediction and phenomenon detection.

The invention provides a pine wood nematode disease stage monitoring and identification method based on unmanned aerial vehicle visible light remote sensing, and particularly relates to the technical field of reading and identification of image data for pine wood nematode disease discoloration identification, and the method comprises the following steps: carrying out geometric registration, cutting and other preprocessing based on obtained unmanned aerial vehicle visible light remote sensing data; the method comprises the following steps: calculating vegetation indexes based on visible light three wave bands: a visible light wave band difference vegetation index (VDVI), an extra-green index (ExG), a visible light wave band difference vegetation index (VDVI), and a visible light wave band difference vegetation index (VDVI); converting the visible light image and the corresponding vegetation index image into a grayscale image, and performing multi-threshold segmentation on the grayscale image; and the color-changing standing tree is extracted according to the optimal threshold value, the extraction result is post-processed to realize single-plant color-changing standing tree identification, and the efficiency and precision of pine wood nematode disease color-changing wood identification based on the visible light unmanned aerial vehicle remote sensing image are further improved.

The application discloses a kind of visible band tunable femtosecond pulse laser generation device, including input side single-mode optical fiber jumper component, visible light frequency comb generation module, collimating lens, tunable filter module, focusing lens and output side single-mode optical fiber jumper component in turn along laser light path, visible light frequency comb generation module includes germanium core optical fiber, germanium core optical fiber is tapered optical fiber, including core and cladding, core is SiO2 core of GeO2 doping concentration 98mol.%, cladding is SiO2 cladding, the input end of germanium core optical fiber is fused with the output end of input side single-mode optical fiber jumper component.The device has high integration, and through the structure of all-fiber realizes integrated all-fiber and tunable stable, accurate single-wavelength femtosecond pulse laser output, does not need to adjust optical path frequently to complete coupling in use process, saves manpower and material resources, and the laser generator structure is small and exquisite, compatibility is good, and it is convenient to be applied in large-scale complex optical system.

The invention provides a multispectral imaging underwater high-speed image sensor and an imaging method. The multispectral imaging underwater high-speed image sensor comprises a color imaging module, a monochromatic imaging module, an optical filter rotating wheel, a synchronous central control platform, a lighting system, a supporting structure and a waterproof shell. The supporting structure and the waterproof shell fix the multispectral imaging underwater high-speed image sensor at a determined position and guarantee long-term working stability and waterproofness, and the synchronous central control platform controls the illumination system to provide proper underwater illumination conditions and controls the optical filter rotating wheel to be in a required imaging wave band. And synchronously controlling the color imaging module and the monochromatic imaging module to acquire video images, transmitting the video images back to the synchronous central control platform, performing video compression processing on the video images, and pushing the video images to an upper computer for display. The high frame rate can significantly improve the image ghost problem of fast swimming fishes, infrared band imaging supported by the optical filter rotating wheel and the illumination system has a longer observation distance than a visible band, and a clearer imaging effect can be obtained in a high-turbidity environment.

The present invention relates to the technical field of electro-optical regulation, and particularly relates to a regulation structure for independent regulation of visible light and infrared light. The regulation structure includes an infrared regulation structure and a visible light regulation structure, and the infrared regulation structure and the visible light regulation structure are respectively arranged on both sides of a substrate that is permeable to visible light. The infrared regulation structure sequentially includes a reflection layer, an insulating layer, and a regulation layer along the direction away from the substrate. The visible light regulation structure sequentially includes a first electrode layer, a first color-changing layer, an electrolyte layer, a second color-changing layer, and a second electrode layer along the direction away from the substrate. The preparation material of the reflection layer includes a conductor and a semiconductor that have infrared reflection and visible light transmission. The preparation material of the regulation layer includes a conductor or a semiconductor that is infrared semi-transparent and visible light transmissive. The preparation materials of the first color-changing layer and the second color-changing layer are metal oxides. The embodiment of the present invention provides a regulation structure for independent regulation of visible light and infrared light, which can provide a regulation structure for flexibly controlling the infrared band and the visible band.

The invention discloses a visible-infrared image fusion detector structure and a preparation method thereof. The detector structure comprises a substrate, a visible light absorption layer, an infrared light absorption layer, a metal electrode layer and a protection layer from bottom to top. The structure monolithic integrates a visible light detector and an infrared detector. P-type and N-type doping of the same semiconductor material is realized by regulating and controlling the number of atomic layers (or the thickness of the material) by utilizing the self-doping effect of the number of atomic layers of the two-dimensional semiconductor, so that regulation and control of an electric field built in a heterojunction and a photon-generated carrier transport process are realized through energy band engineering. In combination with a differential mechanism of a spatial domain current signal, detection and imaging of an independent visible band (450-700 nanometers) and an independent infrared band (1.5-4 microns) are realized in a single device. The planar heterojunction detector does not need a complex optical system and a bias circuit, the preparation process is simple, and a novel device design scheme is provided for visible-infrared image fusion detection.

The invention discloses a visible wave band tunable femtosecond pulse laser generating device which comprises an input side single-mode optical fiber jumper assembly, a visible light frequency comb generating module, a collimating lens, a tunable filtering module, a focusing lens and an output side single-mode optical fiber jumper assembly which are sequentially arranged along a laser light path. The visible light frequency comb generation module comprises a germanium core optical fiber, the germanium core optical fiber is a conical optical fiber and comprises a fiber core and a cladding, the fiber core is a SiO2 fiber core with the GeO2 doping concentration being 98 mol.%, the cladding is a SiO2 cladding, and the input end of the germanium core optical fiber is welded to the output end of the input side single-mode optical fiber patch cord assembly. The device is high in integration level, integrated all-fiber and tunable stable and accurate single-wavelength femtosecond pulse laser output is achieved through an all-fiber structure, coupling can be completed without frequently adjusting a light path in the using process, manpower and material resources are saved, and the laser generator is small in structure, good in compatibility and high in practicability. And the system can be conveniently applied to a large-scale complex optical system.

Disclosed in the present invention are a directional radiation device and a use. By regulating radiation on the basis of a specified angle or angle range, broad spectrum angle asymmetric directional thermal radiation in an infrared band is achieved, and the geometric structure of an asymmetric unit can be adjusted to enhance infrared radiation at a specific angle. By changing the material of a spectral selection layer, the wavelength of thermal radiation is regulated, thereby achieving spectral selective emission in the infrared band. By attaching a porous membrane on the directional radiation device, the reflectivity of the directional radiation device for a visible band is enhanced, thereby truly achieving passive radiation cooling on both vertical and inclined surfaces.

An AlO x A method for preparing an Al2O3 low-reflection, etch-resistant composite coating includes the following steps: In a first chamber, the surface of a substrate is cleaned by ion bombardment; in a second chamber, argon and oxygen are introduced, and at least one layer of Al2O3 is deposited on the surface of the substrate using pulsed DC magnetron sputtering. x Layer; containing AlO x The substrate of the layer is fed into the third chamber, argon and oxygen are introduced, and AlO is sputtered using pulsed DC magnetron sputtering. x An Al2O3 layer is deposited on the surface of the layer and cooled in the furnace to obtain AlO. x - Al2O3 low-reflection, etching-resistant composite coating. This invention constructs a non-stoichiometric Al2O3 composite coating within the composite coating. x A gradient structure of oxygen content gradually transitioning from a layer to a dense Al2O3 layer, with low oxygen content AlO2O3. x The layer has a high oxygen vacancy concentration and low reflectivity, which can effectively reduce the reflection intensity in the ultraviolet-visible band. The dense Al2O3 layer formed on the surface has good structural stability and chemical inertness, thus significantly improving the etching resistance of the coating in the plasma etching environment.

The invention relates to a sum frequency laser system with continuously adjustable wavelength and pulse width. The sum frequency laser system comprises two laser light source devices with adjustable wavelength, a sum frequency laser amplification device and a laser sum frequency device. The sum frequency laser system further comprises a signal generator and an intensity modulator. The pulse laser can be generated through two laser light source driving devices with adjustable wavelengths, or through an intensity modulator, and can also be generated through a sum frequency laser amplification device. When the laser light source driving device and the intensity modulator generate the pulse laser, the signal generator controls the duty ratio and the time delay of the pulse. The two pulse lasers enter the sum frequency laser amplification device and the laser sum frequency device together, and visible band laser output with continuously adjustable wavelength and pulse width is achieved. The invention has the advantages of flexible wavelength, simple and compact structure and the like, and has important practical value and application prospect.

The application provides a visible band photonic spin Hall device based on a plasmonic metasurface, which comprises: an anisotropic metasurface, which is designed based on a PB geometric phase principle and is formed by periodic arrangement of supercells; the supercells are arranged by homochiral superatoms every interval p and rotation angle by turns, so that the last superatom of each supercell rotates 180 DEG relative to the first superatom; the superatom is a half-wave plate working in a wide frequency visible light band, that is, when left-handed or right-handed circularly polarized light is incident on the superatom, the reflected light is converted into right-handed or left-handed circularly polarized light; under parallel circularly polarized light incidence, the reflected circularly polarized light of the metasurface device follows the generalized Snell law, and left-handed light and right-handed light are reflected towards opposite directions respectively, that is, a photonic spin Hall effect is generated.

The present invention discloses a laser gain medium and a visible band solid laser, which belongs to the technical field of solid lasers and can solve the existing Tb 3+ The solid laser output power is low and the pump light source is expensive. 3+ ions and Dy 3+ Ion materials are used as laser gain media, where Tb 3+ ions as active ions, Dy 3+ ions as sensitizing ions, Tb 3+ The pumping band of the laser material is converted from 488nm to 450nm, solving the problem of existing Tb 3+ Solid-state lasers cannot use commercial high-power 450nm band semiconductor lasers as pump sources, effectively reducing the cost of pump light sources and increasing Tb 3+ Output performance of solid-state lasers.

The invention discloses a self-Raman intracavity frequency conversion five-wavelength selectable laser which comprises a machine body, a pumping source, a total reflection lens, a neodymium-doped yttrium vanadate crystal, a Q switch, a middle lens, a first BBO crystal, a second BBO crystal and an output lens are sequentially arranged in the machine body, and the total reflection lens and the output lens form an oscillation cavity. The axial center lines of the pumping source, the total reflection lens, the neodymium-doped yttrium vanadate crystal, the Q switch, the middle lens, the first BBO crystal, the second BBO crystal and the output lens are overlapped, a horizontal rotation adjusting table is arranged at the lower end of the first BBO crystal, a fixed platform is arranged at the lower end of the second BBO crystal, and the first BBO crystal is rotated through fine tuning to adjust the axial center lines of the neodymium-doped yttrium vanadate crystal, the Q switch and the middle lens. And the light passing direction of the first BBO crystal is consistent with the phase matching angle required by the output of the corresponding wavelength, so that the frequency mixing of the corresponding fundamental frequency light or each order of Stokes light in the laser resonant cavity is selectively realized, and the visible band laser with different wavelengths is correspondingly output. The technical scheme is reasonable in structural design, high in laser efficiency, stable in output and good in practicability.

The present invention belongs to the field of medical device technology, specifically an infrared endoscope system. The infrared endoscope system of the present invention includes an illumination light source, an objective optical system, an optical fiber image transmission system, a switching system and an image collector; the objective optical system includes five lenses and an aperture; the switching system includes six lenses and an aperture; the illumination light source is a near-infrared 1.2-1.8μm band light source; the optical fiber image transmission system uses a single-filament optical fiber, which is arranged in a hexagonal manner; the image collector uses a 320×256 pixel CCD sensor for imaging. The system designs an infrared band endoscope, which breaks the limitations of common visible light band endoscopes in certain special occasions, provides a guarantee for the stability of observation, and the system has a small size and a large field of view, which can effectively improve the efficiency of observation; the optical system adopts a spherical design, which reduces the difficulty of processing and reduces the overall cost of the system.

The present invention relates to the technical field of intelligent windows, and particularly to an intelligent window with visible and infrared dynamic regulation. The intelligent window sequentially includes a visible light-transparent substrate, a conductive layer, a first color-changing layer, an ion conduction layer, an electrolyte layer, a second color-changing layer, a reflective layer, an insulating layer, and an adjustment layer along the thickness direction. The conductive layer, the reflective layer, and the adjustment layer are all connected to a power source; when infrared light irradiates the adjustment layer, the unreflected infrared light passes through the adjustment layer, forming an optical resonant cavity structure between the adjustment layer and the reflective layer. The optical resonant cavity is used to adjust the absorption of infrared light to regulate the infrared light emissivity of the intelligent window; by applying a voltage between the conductive layer and the reflective layer, ions in the electrolyte layer enter the first color-changing layer or the second color-changing layer to cause the first color-changing layer or the second color-changing layer to change color. The embodiments of the present invention provide an intelligent window with visible and infrared dynamic regulation, which can provide an intelligent window for flexibly controlling the infrared band and the visible band.

The present invention discloses an optical projection lens for observing the concave surface of a sphere suspended in a liquid, comprising a first lens, a second lens, a third lens, an aperture stop and a fourth lens arranged in sequence from the image side to the object side; the first lens, the second lens, the third lens and the fourth lens are all positive lenses; the first lens, the second lens and the third lens are single-piece lenses; and the fourth lens is a cemented lens. The optical projection lens for observing the concave surface of a sphere suspended in a liquid of the present invention can work in the entire visible band, the observable diameter range can be up to 14.5 mm at most, and the maximum observable concave depth is 5 mm; the surfaces of all components are only composed of standard spherical surfaces and planes, with a simple structure and low cost; the surface and edge of the concave surface suspended in the liquid can be detected simultaneously, thereby improving the detection efficiency, and the imaging quality is high, and it can be used for the detection of contact lenses and the like.

The invention discloses a preparation method and application of a wafer-level palladium ditelluride-palladium diselenide vertical heterojunction thin film for a nonlinear saturable absorber. The structure of the material sequentially comprises a palladium ditelluride thin film and a palladium diselenide thin film from top to bottom, and the wafer-level two-dimensional palladium ditelluride-palladium diselenide thin film vertical heterojunction is prepared by adopting a chemical vapor deposition technology assisted by electron beam evaporation coating. Experimental results show that the nonlinear absorption performance of the obtained heterojunction thin film is superior to that of a single palladium ditelluride thin film in a visible wave band of 550 nm; in the near-infrared band of 1550 nm, the modulation depth can reach 31.92%, and the wide-spectrum response characteristic from the visible band to the near-infrared band is shown. The material obtained by the invention has the advantages of controllable wafer-level growth, excellent nonlinear performance, wide operating wavelength range and the like, provides important material strategy and theoretical support for the design of ultrafast photonic devices such as high-performance mode-locked lasers and all-optical switches, and has important application value.

The present invention discloses an optical lens system and surveillance camera equipment. The optical lens system includes a plurality of lens groups arranged sequentially from the object side to the image side, with an optical axis formed between the plurality of lens groups. The plurality of lens groups include a first lens group and a second lens group. The first lens group has negative optical focal length and is movable along the extension direction of the optical axis; the second lens group has positive optical focal length and is movable along the extension direction of the optical axis. By arranging the first lens group and the second lens group, the refractive index and Abbe number of light from the object side to the image side are complementary, ensuring a resolution effect in the infrared band while ensuring minimal chromatic aberration in the visible band. By adjusting the positions of the first lens group and the second lens group, the change in the conjugate distance of the first lens group and the change in the conjugate distance after magnification of the second lens group are offset, achieving image plane compensation, thereby providing an ultra-low-cost, glass-plastic hybrid, high-reliability zoom optical lens system.

The invention discloses a three-band common-caliber satellite-borne optical imaging system, relates to the technical field of satellite-borne multispectral optical imaging, and solves the problems that true color imaging and fusion comparison of visible light and infrared information cannot be realized in the prior art. The system is composed of a primary mirror, a secondary mirror, a visible light band system, a medium-wave infrared band system and a long-wave infrared band system which are sequentially arranged on an optical axis. The first beam splitter prism divides the light reflected by the secondary mirror into two paths, and one path is focused on a visible band detector for imaging through a visible band compensating mirror group; the other path is divided into two paths through a second beam splitter prism, and one path is focused on a medium-wave infrared band detector through a reflector, a medium-wave infrared band compensating mirror group and a medium-wave infrared band cold diaphragm; and the other path is focused on a long-wave infrared band detector through a long-wave infrared band compensation mirror group and a long-wave infrared band cold diaphragm. While the imaging performance of each wave band is ensured, the manufacturing cost, the size and the weight of the system are remarkably reduced, and the system is more suitable for aerospace application scenes.

The invention discloses an online continuous detection device and detection method for spunlace non-woven fabric, and relates to the technical field of non-woven fabric production detection equipment, the online continuous detection device sequentially comprises a pressure applying module, a deformation detection module and a ventilation detection module, the pressure applying module is used for applying pressure to the upper surface of the non-woven fabric at intervals from top to bottom; the deformation detection module comprises a developing belt, a detection rod and an amplification detection assembly, the developing belt comprises a flat spreading part, the flat spreading part is flatly spread and always attached to the upper surface of the non-woven fabric, developing particles are supported on the flat spreading part, and when the developing belt synchronously runs along with the non-woven fabric, the developing particles always move on the flat spreading part; the detection rod is correspondingly, vertically and slidably connected below the spreading part, the top of the detection rod is used for keeping contact with the lower surface of the non-woven fabric, and the amplification assembly is used for performing amplification detection on the vertical displacement of the detection rod; the air permeability detection module is used for detecting the air permeability of the deformed area of the non-woven fabric. The non-woven fabric elasticity detection device has the effect of improving non-woven fabric elasticity detection efficiency.

This invention discloses a nitride single-transverse-mode dual-pass racetrack-shaped microring waveguide for the external cavity of a visible-light FP laser. It employs an AlN ridge waveguide system or a GaN strip waveguide system, achieving low-loss transmission of a single transverse mode in the visible-light band through precise control of waveguide cross-sectional parameters. The waveguide structure consists of two main straight waveguides and a racetrack-shaped microring waveguide forming a dual-pass coupling structure. The main waveguides are equally spaced on both sides of the microring straight track, forming three ports: input, pass-through, and download. This invention utilizes the dual-pass structure to feed back specific mode optical signals into the FP laser cavity, achieving self-injection locking and spectral purification. This invention features rigorous design logic and a compact structure, possessing significant monolithic integration application value in the fields of laser displays and precision atomic clocks.

A display device is provided, which includes a backlight module, a light modulation module, and a camera module. The light modulation module is configured to modulate light from the backlight module. The camera module includes a lens assembly. The backlight module is disposed between the camera module and the light modulation module, and includes a first reflective element. The first reflective element is arranged in accordance with the arrangement of the lens assembly. A reflectance of the first reflective element for the visible band ranges from 35% to 95%, and a transmittance of the first reflective element for the infrared band is greater than 0%.

The present invention relates to the field of coating technology, and specifically proposes a fly ash-based radiation cooling coating and a preparation method thereof, wherein the fly ash-based radiation cooling coating comprises the following components by weight: 30 to 35 parts of fly ash, 15 to 20 parts of adhesive, 4 to 8 parts of thermal conductor, 12 to 16 parts of reflector and 30 to 40 parts of ethanol. After waste coal slag is made into fly ash by ball milling and calcining, the fly ash is mixed with other raw materials and sieved to make fly ash radiation cooling coating. The radiation cooling coating prepared by the present invention has high radiation characteristics in the mid-infrared band and high emission characteristics in the visible light band, and the raw materials are low in price and the preparation method is simple, which is very suitable for industrial production and large-scale promotion and use.