258 results about "Scattering effect" patented technology

Disclosed in the present invention is a salient contour matching-based method for target measurement in a severe imaging environment. The method specifically comprises: (1) acquiring a binocular image of a target; (2) establishing a global-local joint constraint-based background light estimation model, and removing a scattering effect of a medium in an imaging environment to obtain a restored left eye image and a restored right eye image; (3) learning an original image, and on the basis of a residual between a network reconstructed image and the original image, obtaining target localization prediction maps of the left eye image and the right eye image; and (4) respectively extracting contour lines of the target in the left eye image and the right eye image, constructing feature matching descriptors of contour points, performing stereo matching on the two sets of contour lines by minimizing matching cost, and performing three-dimensional reconstruction on the contour lines in light of calibrated intrinsic and extrinsic parameters to complete the measurement of a key size. According to the present invention, the key sizes of different targets in a severe environment can be accurately measured, thereby providing an effective solution for the problem of measuring the sizes of targets in a severe environment.

The invention provides an underwater image enhancement method combining high-frequency enhancement, space-frequency mixed feature extraction and a Mama enhancement fusion technology. The method aims at solving the problems of low contrast ratio, color distortion, detail loss and the like caused by absorption and scattering effects in the light propagation process of the underwater image, the image quality is improved, and the visual perception effect is improved. The method specifically comprises the following four main steps: firstly, acquiring and preprocessing initial data sets of different underwater scenes; secondly, extracting texture detail information of the image through a texture enhancement module; thirdly, further enhancing texture details by using a space-frequency mixed feature extraction module; and finally, in combination with the original image, the texture information and the spatial frequency domain enhancement result, realizing feature fusion of the image through a Mama enhancement fusion module, thereby effectively recovering details of the underwater image, correcting color deviation and improving the definition and visual effect of the image. According to the method, the enhancement performance of the underwater image in a complex environment can be improved, and powerful support is provided for applications such as underwater detection, target detection, object recognition and image segmentation.

The invention discloses an ocean-ionized layer ultralow-frequency electromagnetic target detection simulation method based on ADI-FDTD and SIBC, and belongs to the field of computational electromagnetics. The ocean-ionized layer ultralow-frequency electromagnetic target detection simulation method comprises the following steps: introducing a frequency domain surface impedance boundary condition SIBC into an ADI-FDTD model; the ocean-ionosphere simulation model is used for carrying out ocean-ionosphere ultra-low frequency electromagnetic wave attenuation analysis on the ocean-ionosphere ultra-low frequency electromagnetic wave attenuation. According to the method, the frequency domain surface impedance boundary condition (SIBC) is combined with the ADI-FDTD method for the first time, so that the calculation space for analyzing the influence of the seabed on electromagnetic wave propagation is reduced. The calculation requirement is obviously reduced, and the efficiency is improved. In addition, the SIBC model based on the ADI-FDTD method can be used for simulating the scattering effect of electromagnetic waves on a high-conductivity and low-conductivity area interface.

The invention relates to a deep ultraviolet light-emitting diode with a light scattering structure and a preparation method of the deep ultraviolet light-emitting diode. The light-emitting diode comprises a substrate layer, a buffer layer and an N-type semiconductor transmission layer which are sequentially arranged along the epitaxial growth direction of a chip, wherein the shape of the N-type semiconductor transmission layer is divided into an upper part and a lower part, and the multi-quantum well active layer, the P-type semiconductor transmission layer and the P-GaN contact layer sequentially cover the surface of the upper part of the N-type semiconductor transmission layer; a horizontal light scattering structure layer and a vertical light scattering structure are respectively distributed in the upper part and the lower part of the N-type semiconductor transmission layer. According to the invention, the scattering effect of light in the N-type semiconductor transmission layer is improved, the optical waveguide effect of the N-type semiconductor transmission layer is broken, the light is effectively prevented from spreading to the metal n electrode, meanwhile, the light can be scattered, the bottom light emitting efficiency of the deep ultraviolet LED is improved, and the light extraction efficiency is improved.

The invention discloses a real haze image defogging method based on a haze degradation model. The method comprises the following steps: constructing a haze degradation model fusing multiple scattering effects and multiple image degradation factors; using the haze degradation model to construct a training data set including the clear image and the corresponding pseudo haze image; constructing a defogging network for a real haze scene; training the defogging network by adopting the training data set until a preset loss function is converged; and inputting a to-be-defogged image into the trained defogging network to obtain a defogging result. According to the haze degradation model constructed by the invention, the difference between a synthetic domain and a real domain is effectively relieved; a designed space-frequency hybrid module improves the adaptability of the model to complex degradation characteristics; the prior-guided feed-forward network fully excavates and fuses dark channel prior information, and the sensing and modeling capability of the model to the haze area is effectively enhanced.

The invention belongs to the technical field of ocean laser radar remote sensing detection, and particularly relates to an ocean subsurface water body element vertical structure inversion method and system and a computer program. The method comprises the following steps: carrying out preprocessing, distance correction and logarithm conversion on a laser radar echo signal; constructing an iterative hybrid inversion model to invert a water body attenuation coefficient and a particulate matter backscattering coefficient; performing scattering correction for multiple times; matching multi-source data to construct a deep learning model; and finally inverting the chlorophyll concentration and the vertical section of the granular organic carbon. According to the method, the multiple scattering effect of the water body and the influence of system parameters are comprehensively considered, data driving and a physical model are combined, high-precision and automatic marine water body element inversion can be achieved under the complex water quality condition, and the method is suitable for ecological environment monitoring and research of large-range and multi-type sea areas.

The invention belongs to the technical field of immunoassay and biosensing, and provides a preparation method of a photoelectrochemical sensor based on CuO-induced photocurrent polarity reversal. The invention provides a preparation method of the photoelectrochemical sensor based on CuO-induced photocurrent polarity reversal. Specifically, hollow polyhedral flower-shaped CuO with a unique inner cavity structure is adopted as a polarity induction factor, so that multiple light refraction and scattering effects are remarkably enhanced, and the light capture efficiency is improved. Besides, when CuO is introduced to the surface of the In2O3 / ZnCdS electrode as a photocurrent polarity reversal factor, due to the energy band structure difference between CuO and In2O3 / ZnCdS, the migration path of a photon-generated carrier is changed, and the photocurrent polarity is reversed from an anode to a cathode photocurrent, so that the detection specificity of the gastrin-releasing peptide is improved. The photocurrent polarity reversal strategy effectively eliminates potential false positive signal interference, and the accuracy and sensitivity of detection are remarkably improved. According to different photoelectrochemical signal intensities of to-be-detected substances with different concentrations, the gastrin-releasing peptide is detected.

The invention provides an optical system and a monitoring method for monitoring a stimulated Brillouin scattering effect, and the optical system for monitoring the stimulated Brillouin scattering effect comprises the steps: firstly, conveying a narrow-linewidth seed source into a laser amplifier through a first optical device, and carrying out the narrow-linewidth laser amplification; and the stimulated Brillouin scattering light generated by the laser amplifier is guided out to the return light monitoring module, so that the return light power and the spectral component of the stimulated Brillouin scattering light are detected in real time through the return light monitoring module, and the purposes of simultaneously and accurately measuring the power of the stimulated Brillouin scattering light and observing the laser component are achieved. Whether the stimulated Brillouin scattering effect occurs or not can be judged more easily; furthermore, according to the optical system, the narrow-linewidth seed source and a spectrograph in the return light monitoring module can be protected from being damaged by return light to the maximum extent by adjusting the light splitting proportion of the first optical device and the return light monitoring module, and the purposes of accurately judging the stimulated Brillouin scattering effect and protecting system safety are achieved.

The invention provides a visual detection method for processing defects of a groove on the surface of a workpiece, which is used for detecting the defects of a slot of a triangle of a circular knitting machine, a lightweight slot defect detection model CSGE-DETR of the triangle of the circular knitting machine is used in the method, the trunk of the model comprises a CGSE module, and the model further comprises an SOEP trunk network and a RepC3 module introducing wavelet convolution WTConv; the detection method comprises the following steps. The method comprises the steps of 1, image acquisition; 2, preprocessing the image; step 3, defect identification; the computer machine vision detection method is optimized for solving the problems that the defect size of the triangle of the circular knitting machine is small, the background is complex, and the imaging quality is reduced due to the optical scattering effect when the defect is captured.

The invention relates to the technical field of wind power plant echo suppression, in particular to a method for analyzing the multipath scattering effect of an offshore wind plant on a passive radar system, and the method comprises the steps: constructing a novel sea condition offshore wind plant model; the offshore wind plant model comprises a model construction module, a simulation position design module and a sea condition program application macro module; calculating scattering superposition RCS of different wind turbines in the wind power plant under different incident angles based on the offshore wind power plant model; constructing a multipath scattering mathematical model of the offshore wind power plant according to the offshore wind power plant model and scattering superposition RCS of different wind turbines in the wind power plant; the multipath influence of the offshore wind power plant on the passive radar system is confirmed based on the multipath scattering mathematical model of the offshore wind power plant, and the method is of great significance to scientific estimation of the passive radar system by the multipath scattering effect of the wind power plant.

The invention discloses a preparation method and application of a PLA (polylactic acid) / PTFE (polytetrafluoroethylene) radiation refrigeration composite film based on an electrostatic spinning method, and belongs to the field of radiation refrigeration materials. And preparing the polymer radiation composite fiber membrane by adopting an electrostatic spinning technology. The obtained micro-nano size fiber film has a porous structure, can realize a strong Mie scattering effect on solar wavelength, improves the solar reflectivity of the radiation film, and realizes the reflectivity of 85% or above within the wavelength of 400-1400 nm and the relatively high infrared emissivity of 90% within the wavelength of 8-13 [mu] m. The radiation cooling composite film has great application potential value in the field of low-temperature grain storage.

The invention discloses a single-frequency fiber laser capable of inhibiting a nonlinear effect, and provides a single-frequency fiber laser capable of prolonging the length of a gain fiber and inhibiting the nonlinear effect in the fiber laser to solve the problem that the existing single-frequency fiber laser structure cannot inhibit the deterioration of line width caused by various nonlinear effects while realizing hectowatt-magnitude power single-frequency laser output. And line width broadening caused by the cavity length is compensated based on a self-injection locking line width narrowing optical path. And meanwhile, a phase-shift long-period fiber grating is adopted to inhibit excitation of various nonlinear effects (such as a stimulated Raman scattering effect, a stimulated Brillouin scattering effect and a nonlinear refraction effect) in a self-injection locking line width narrowing light path and a light energy amplification process. Stable hectowatt power single-frequency laser output can be realized, and the influence of the nonlinear effect in the fiber laser on the output line width can be effectively inhibited in the subsequent MOPA structure.

The invention relates to the technical field of additive manufacturing, in particular to a photocuring printing scattering suppression method and system based on acousto-optic modulation. According to the method, in the photocuring printing process, an acousto-optic modulation device is used for generating a focused ultrasonic field in a printing material, specific refractive index distribution is formed in the material based on the photoelastic effect, and therefore a refractive index regulation and control area used for restraining and guiding scattered light propagation is constructed in a local space; therefore, the scattering effect is suppressed, and the forming precision and the structural fidelity are improved. The system comprises a photocuring device, a light source, a printing platform and an acousto-optic modulation device used for achieving the method, the acousto-optic modulation device is composed of an ultrasonic transducer and an acoustic lens, and the acousto-optic modulation device forms a focusing sound field under external excitation and works in cooperation with the light source. The method is suitable for photocuring printing of various high-scattering light-sensitive composite materials, comprises material systems containing particles, cells or components with remarkable refractive index difference, and has good material adaptability.

The invention discloses a Fe3C (at) C assembled nano wave-absorbing structure and a preparation method thereof, and the preparation method comprises the following steps: synthesizing Fe2O3 (at) C spheres through a hydrothermal method, carrying out carbon removal treatment on the Fe2O3 (at) C spheres by adopting an air oxidation method to obtain a Fe2O3 hollow sphere precursor, and finally carrying out chemical vapor deposition (CVD) reaction on the obtained Fe2O3 hollow sphere precursor to convert a Fe2O3 phase in the Fe2O3 hollow sphere precursor into a Fe3C phase to form Fe3C hollow spheres, thereby obtaining the Fe3C assembled nano wave-absorbing structure. And growing a C nano-particle array on the surface of the Fe3C hollow sphere in situ so as to obtain the Fe3C-C assembled nano wave-absorbing structure. The problems that an existing magnetic wave-absorbing material is large in density, poor in impedance matching, low in electromagnetic wave loss efficiency and the like are solved. According to the prepared nano wave-absorbing structure, coupling of dielectric loss and magnetic loss and optimization of impedance matching are easily achieved, the multiple scattering effect of electromagnetic waves is greatly enhanced through the C nano-particle array structure and the hollow structure on the surface of the nano wave-absorbing structure, enhancement of the interface polarization relaxation loss effect is promoted through a large number of Fe3C-C heterogeneous interfaces, and the wave-absorbing performance is improved.

The invention relates to a method for determining the layer thickness of an at least partially transparent surface coating on the surface of a substrate, using a measuring device for emitting focused radiation. The invention is characterized in that the distance between the surface of the substrate and the measuring device for emitting focused radiation is changed by a relative movement between the measuring device and the substrate, wherein the image of the radiation is captured in different relative positions, wherein in the case of an image with a clear outline edge, focusing is inferred at the interface between the surface coating and the substrate and the current relative position is stored as the first position, and wherein in the case of an image surrounded by scattering effects, focusing is inferred at the interface between the surface coating and the air and the current relative position is stored as the second position, after which the difference between the first and second positions is used to determine theTaking into account the refractive index of the transparent surface coating, the layer thickness of the at least partially transparent surface coating is determined.

The invention provides an anti-reflection atomization film layer and a preparation method thereof, anti-reflection atomization coated glass and a photovoltaic module, a multi-stage pore structure is distributed in the anti-reflection atomization film layer, the multi-stage pore structure comprises a first pore and a second pore, and the pore diameter of the second pore is larger than that of the first pore; at least part of the second holes are flat holes, and pit structures are irregularly distributed on the surface of the film layer. The anti-reflection atomization film layer provided by the invention is colorless, the surface of photovoltaic glass is covered with the anti-reflection atomization film layer, and a battery piece in a photovoltaic module can be covered through the scattering effect of the film layer on light rays, so that the color distribution consistency of the photovoltaic module can be greatly improved; through the anti-reflection effect of the film layer on incident light, the anti-reflection effect is realized, and the power generation power of the photovoltaic module is improved.

The invention discloses a multi-cyano offset substituted pentamethine cyanine dye and a synthesis method and application thereof, and the dye has the following general formula structure: # imgabs0. According to the multi-cyano offset substituted pentamethine cyanine dye disclosed by the invention, the absorption emission wavelength is increased by introducing an offset substitution structure; the dye has near-infrared first-area imaging and treatment performance, so that the optimal excitation and emission wavelength can be flexibly selected, the dye shows obvious Stokes shift, reduction of self-absorption and scattering effects is facilitated, the imaging definition and depth are improved, the molar extinction coefficient of the prepared dye is up to 190000, and the dye can be applied to near-infrared first-area imaging and treatment of the near-infrared first-area imaging and treatment of the near-infrared first-area imaging and treatment of the near-infrared first-area imaging. According to the present invention, with the application of the dye, the light energy utilization degree of the dye is substantially improved, the long wavelength light with the deeper penetration depth can be strongly absorbed, the light energy capture and conversion can be effectively achieved, the photosensitizer efficiency can be improved, the light dose can be reduced, the phototoxicity can be reduced, the high absolute fluorescence quantum yield can be represented, and the biological imaging effect can be substantially improved; and the imaging quality is higher.

The application provides an optical system and a monitoring method for monitoring stimulated Brillouin scattering effect. The optical system for monitoring stimulated Brillouin scattering effect firstly delivers a narrow linewidth seed source into a laser amplifier through a first optical device to amplify the narrow linewidth laser, and guides stimulated Brillouin scattering light generated by the laser amplifier to a back light monitoring module to detect the back light power and spectral components of the stimulated Brillouin scattering light in real time through the back light monitoring module, so as to realize the purpose of simultaneously and accurately measuring the stimulated Brillouin scattering light power and observing the laser components, and is more conducive to judging whether the stimulated Brillouin scattering effect occurs. Further, the optical system can adjust the light splitting ratio of the first optical device and the back light monitoring module to protect the narrow linewidth seed source and the spectrometer in the back light monitoring module from the damage of the back light to the greatest extent, and achieve the purpose of accurately judging the stimulated Brillouin scattering effect and protecting the system safety.

The invention relates to a film coating device, a film and a preparation method of the film. The film coating device comprises a vacuum chamber, a first-stage rotating disc, a second-stage rotating disc and a film coating source, wherein the first-stage rotating disc, the second-stage rotating disc and the film coating source are located in the vacuum chamber; according to the preparation device system, through the arrangement of the first-stage rotating disc and the second-stage rotating disc, deposition during thin film evaporation has a certain periodic characteristic, so that the expected scattering effect is generated, and the thickness of the scattering thin film only needs several microns when the expected scattering degree is generated; in addition, through the arrangement of the film coating source, the thin film with the high scattering rate can be obtained, the hardness and adhesive force of the obtained thin film can be improved, and the quality of the thin film is improved.

The invention relates to the technical field of underwater imaging, provides a Fourier lamination underwater imaging system and method based on adaptive phase retrieval, and effectively solves the problem of insufficient imaging resolution caused by a strong scattering effect of a water body and aperture limitation of an optical system in a traditional underwater imaging technology. According to the method, the Fourier lamination imaging technology is applied to the underwater environment for the first time, and the spatial resolution is improved by 2.24 times compared with that of a traditional method in combination with the self-adaptive phase retrieval algorithm. Further experiments show that even under the strong scattering condition, the scheme can still keep the resolution performance obviously superior to that of a traditional method. The invention provides a novel underwater high-resolution imaging technical scheme, the imaging performance of marine resource exploration and underwater engineering facility detection can be remarkably improved, and the method has important application value.

The invention relates to the technical field of optical fiber lasers, and proposes an ultra-wideband tunable optical fiber communication light source based on gas stimulated Raman scattering, comprising a 1μm band seed source, an electro-optic modulator, a signal generator, an optical fiber amplifier, a solid-hollow compact coupling device, an optical fiber end cap, a hollow-core optical fiber, a micro gas cavity, a lens, a dichroic mirror, and a methane gas 1μm band tunable pump source. The tuning range covers at least 1024nm-1126nm. Based on the stimulated Raman scattering effect of methane gas, it can be converted into a communication band laser covering the entire S+C+L+U band. Thanks to the Raman characteristics of methane molecules, the output laser has a corresponding narrow line width single spectral line under single wavelength pumping, without accompanying ASE noise amplification, etc., and does not need to be selected through secondary filtering. At the same time, the use of the hollow-core optical fiber ensures that the output laser is only single-mode, and high beam quality can be guaranteed without other operations.

The application discloses a deep ultraviolet light emitting diode with light scattering structure and a preparation method thereof. The light emitting diode comprises, in sequence along a wafer epitaxial growth direction, a substrate layer, a buffer layer and an N-type semiconductor transmission layer; wherein the N-type semiconductor transmission layer has an upper and lower part in shape, a multi-quantum well active layer, a P-type semiconductor transmission layer and a P-GaN contact layer are sequentially arranged on the surface of the upper part of the N-type semiconductor transmission layer; and a horizontal direction light scattering structure layer and a vertical direction light scattering structure are respectively arranged in the inner part of the upper and lower parts of the N-type semiconductor transmission layer. The application improves the scattering effect of light in the N-type semiconductor transmission layer, breaks the light waveguide effect of the N-type semiconductor transmission layer, effectively blocks the light propagation to the metal n electrode, simultaneously scatters the light, improves the bottom light extraction efficiency of the deep ultraviolet LED and improves the light extraction efficiency.

The present application relates to the technical field of medical image processing, and particularly relates to a CBCT data enhancement method and system based on anatomical region constraint and physical consistency; a human body region mask is acquired and a data enhancement model only exerting enhancement disturbance on the human body anatomical tissue region is constructed, a plurality of enhancement disturbances conforming to the CBCT imaging physical mechanism are combined, the CBCT data after enhancement is strictly limited to the anatomical range, non-physical disturbance introduced by the air region is avoided, and the CBCT data after enhancement is close to the real imaging degradation process; at least one enhancement disturbance including gray scale shift, Gamma nonlinear transformation, compound noise, low-frequency scattering field and stripe artifact is executed on the CBCT image after preprocessing, real imaging degradation factors such as device calibration error, detector nonlinear response, electronic noise, photon statistical noise, scattering effect and reconstruction artifact can be simulated, and the adaptability and robustness of the model to different devices, scanning parameters and patient individuals are significantly improved.

The invention relates to the technical field of lasers, in particular to a Brillouin hybrid integrated laser, which comprises a gain chip; the Bragg grating is connected with the first cavity surface; the first end of the micro-ring resonator is connected with the second cavity surface; the beam splitter is located between the micro-ring resonator and the gain chip; wherein the gain chip is used for generating spontaneous radiation light, the Bragg grating and the low-reflection film form a resonant cavity, the spontaneous radiation light is processed by the resonant cavity to form pump light, the pump light is injected into the micro-ring resonator through the second cavity surface, the micro-ring resonator generates a stimulated Brillouin scattering effect to generate Stokes light, and the Stokes light is transmitted to the Bragg grating and the low-reflection film. The micro-ring resonator performs mode selection amplification on the Stokes light and outputs ultra-narrow linewidth Brillouin laser, and the beam splitter outputs the ultra-narrow linewidth Brillouin laser according to a preset proportion. According to the Brillouin hybrid integrated laser, the integration level and the compactness of the Brillouin hybrid integrated laser are improved while it is guaranteed that the Brillouin hybrid integrated laser has excellent performance.

The present invention discloses a method and system for analyzing surveying and mapping information data for land planning and surveying projects, specifically relating to the technical field of topographic surveying and mapping, and is used to resolve the technical defect of missing surface point clouds caused by fixed laser parameters in vegetation-covered areas. The method obtains near-infrared spectral images, polarization characteristics, and aircraft pitch angles of vegetation areas in real time; calculates vegetation coverage density and inverts leaf inclination distribution entropy; couples multiple scattering effects with geometric propagation characteristics to generate actual penetration path length; dynamically increases pulse energy based on a coverage density threshold; increases emission frequency in stages according to the proportion of penetration path excess; and uses optimized parameters to emit laser beams to generate a high-integrity surface point cloud dataset. The method solves the terrain blind spot problem caused by vegetation occlusion and provides terrain model support for land planning.

The invention belongs to the technical field of aluminum alloy material design and preparation, and particularly relates to an Al-Bi alloy and a preparation method and application thereof. The aluminum alloy material comprises the following components in percentage by weight: 0.5%-3.5% of Bi, 0.02%-0.3% of Si, 0.05%-1% of Fe, less than or equal to 0.05% of impurities and the balance of aluminum, the content of the iron is greater than that of the silicon. The solid solubility of Bi in aluminum is extremely low and is as low as 1t at room temperature; in the solidification process, most Bi is separated out in a pure metal eutectic phase mode, the scattering effect of Bi on lattice electrons is small, and then it is guaranteed that the conductivity of the alloy is maintained at the high level; meanwhile, Bi can be used as a strengthening phase of an Al matrix, and through cold deformation, the hardness of the Al-Bi alloy is higher than that of pure Al, so that the Al-Bi alloy has high conductivity and high strength at the same time.

The embodiment of the invention discloses a display system, and the system comprises an optical fiber scanning array which comprises a plurality of optical fiber scanning units, the optical fiber scanning units are densely arranged in the transverse direction of the optical fiber scanning array, the number of the optical fiber scanning units arranged in the transverse direction is far greater than the number of the optical fiber scanning units arranged in the longitudinal direction, and the number of the optical fiber scanning units arranged in the longitudinal direction is greater than the number of the optical fiber scanning units arranged in the longitudinal direction. The included angle between the adjacent optical fiber scanning units in the transverse direction and the display center is related to the divergence angle of the emitted light. The directional scattering screen is configured to perform directional scattering in the longitudinal direction; light emitted by the optical fiber scanning array forms a display space range for imaging on the other side of the directional scattering screen through the directional scattering effect of the directional scattering screen.

According to embodiments of the disclosure, it is possible to increase scattering effect and light reflectance in the area around the light source by increasing the ratio of the base layer exposed around the light source, which have protrusion patterns and have a higher reflectance than the cover layer and are positioned under the cover layer and the wiring layer of the printed circuit where the light source included in the backlight unit. Thus, there may be provided a backlight unit with enhanced light efficiency and image quality in the area around the light source and a display device including the same.

The present application belongs to the field of automobile head-up display technology, and relates to a vehicle-mounted head-up display optical film with light scattering function and a preparation method thereof. The present application adopts a heat-sensitive shape memory idea, utilizes the light-sensitive characteristics and shape memory function of a light-heat effect type shape memory material, and sets a dynamic scattering layer scattering part. When the front sunlight is irradiated, the scattering part is raised, so that the sunlight is scattered to other directions through the scattering effect of light. Further, the scattering layer substrate is set as an encapsulated scattering solution. The shape memory material in the scattering solution is deformed and curled when irradiated by sunlight, absorbs and reflects part of the light, thereby further reducing the penetration of sunlight into the display film into the driver's line of sight. Moreover, reflective particles and light-absorbing particles are added in the scattering solution, further reducing the penetration of sunlight into the display film, thereby preventing or reducing sunlight from directly entering the driver's eyes from multiple aspects, and further improving the safety of driving.

The utility model provides an ultrathin down lamp, which belongs to the technical field of lighting lamps, and comprises a surface ring, a diffusion piece connected to the opening side of the surface ring, a light guide plate arranged in the mounting cavity, a light source arranged outside the light guide plate in a surrounding manner, and a reflecting plate arranged on one side, deviating from the diffusion piece, of the light guide plate, the diffusion piece comprises a diffusion plate and a diffusion ring connected to the diffusion plate, the diffusion ring is connected to the face ring, the plate face, located in the installation cavity, of the diffusion plate forms a diffusion face, the diffusion face comprises a main diffusion area and a diffusion area arranged outside the main diffusion area in a surrounding mode, the main diffusion area is a plane, and the diffusion area is an arc-shaped face sunken towards the side away from the light guide plate. The ultrathin down lamp provided by the utility model aims to solve the problems that in the prior art, light rays which are not refracted by the light guide plate cannot form a scattering effect when passing through corners of the diffusion cover, light rays are concentrated, and bright spots are generated.