213 results about "Specular reflection" patented technology

The invention discloses a welded pipe surface defect detection system, particularly relates to the technical field of metal pipe surface quality detection, and is used for solving the problem of defect misjudgment and missing detection caused by mixed reflection interference under single light source irradiation in the existing visual detection technology. An annular light source is adopted for time-sharing pulse triggering through a light source control module, reflected light images at different angles are synchronously collected, a feature extraction module constructs a diffuse reflection intensity ratio and mirror reflection angle distribution matrix to generate a three-dimensional reflection feature spectrum, and reflection anomaly characterization of a defect area is enhanced; the area positioning module screens candidate areas and inhibits interference by combining strength ratio circumferential deviation degree and reflection angle gradient change, and the distortion correction module compensates geometric distortion errors based on curvature radius and station movement parameters, filters pseudo defects of abnormal time sequence fluctuation, and improves the accuracy of the distortion correction. And the defect judgment module utilizes a gradient-gray scale space coupling classification model to distinguish the types of cracks, scratches and corrosion, and finally judges the defect authenticity in combination with reflection characteristic deviation vector superposition.

The invention discloses a magnetic material defect detection system based on image recognition, which adopts a first acquisition module, a first determination module, a second determination module, a second acquisition module and a third acquisition module, and is characterized in that the first acquisition module is used for performing multi-angle illumination control on the surface of a magnetic material by adopting a polarized light imaging device; mirror reflection generated by the strong light reflection characteristic is inhibited by adjusting the angle of a polaroid and the incident angle of a light source, original image data with uniform illumination distribution are obtained, and if it is detected that an overexposure area exists in an image, exposure parameters and the polarization angle are automatically adjusted to obtain a high-quality image suitable for follow-up processing; and the first determination module is used for performing multi-scale wavelet transform decomposition according to the acquired high-quality image, identifying a surface defect area by analyzing texture features and edge information in different frequency components, and judging that the surface defect area is a potential defect area if a wavelet coefficient in the high-frequency component exceeds a preset threshold value. The detection performance is obviously improved.

The invention discloses a visual combined infrared precast beam appearance defect detection method, and relates to the technical field of civil engineering structure detection and nondestructive testing, and the method comprises the following steps: establishing an illumination time sequence observation layer, collecting multi-dimensional optical parameters aiming at the surface of a precast beam, and generating a dynamic reflection fingerprint baseline; and performing coherent phase decomposition based on the dynamic reflection fingerprint baseline, separating the specular reflection signal from the material texture signal, and calibrating light spot track and intensity evolution data in the unified baseline. According to the method, an illumination time sequence observation layer is constructed to generate reflection fingerprints, coherent phase decomposition and anti-fact playback are combined, reflection interference is stripped, and crack boundaries are recovered; time coordinates are reconstructed through double-mirror-image anchor points, and crack evolution is accurately recovered; phase conjugate projection and light field traction are combined, a dynamic threshold optical fence is established, the exposure rhythm is controlled in a closed-loop mode, and precise detection of the defects of the precast beam is achieved.

The invention discloses a one-way door control method, system and equipment based on image recognition, and belongs to the field of images. The method comprises the following steps: synchronously obtaining a polarized light image, binocular depth point cloud data and a face image of a target area; the polarized light image and the depth point cloud three-dimensional feature are fused through spatial registration, and a point cloud polarization joint feature is constructed; performing pixel alignment on the joint feature and the face image, and generating a dynamic mask by using polarization degree data of the polarized light image; under the constraint of a dynamic mask, performing cross-modal fusion on the face image and the spatial feature map by adopting a multi-scale attention mechanism, and extracting a multi-modal feature vector containing a face spatial structure, a material attribute and a texture feature; performing similarity comparison on the vector and a preset database, and outputting verification information through a classification network; and triggering a self-adaptive control instruction of the one-way access control system according to the mapping relationship between the verification information and the control strategy. The one-way door can be accurately and effectively controlled in a complex reflective scene.

The invention discloses a photovoltaic POSS (polyhedral oligomeric silsesquioxane)-containing antireflection film coating liquid and a preparation method thereof, the coating liquid comprises the following raw materials in parts by weight: 80-100 parts of modified emulsion, 10-15 parts of modified graphene, 3-5 parts of sodium dodecyl benzene sulfonate, 1-3 parts of triethylene tetramine and 40-60 parts of deionized water, a modified additive in the coating liquid contains a polyhedral oligomeric silsesquioxane structure, the polyhedral oligomeric silsesquioxane structure can form uniformly-distributed nanopores and is matched with a two-dimensional honeycomb lattice structure in the graphene oxide, the surface roughness can be increased, the microstructure can scatter incident light and reduce specular reflection, so that the surface light transmittance is improved, and meanwhile, the modified additive molecule contains a fluoroalkyl structure, so that the surface light transmittance is improved. The fluoroalkane has a high refractive index, so that light reflection can be reduced, and the light transmittance is further improved.

The invention discloses an anti-skid and noise-reduction multifunctional road hot melt coating and a gradient forming process thereof, and relates to the technical field of hot melt coatings. Comprising the following components in percentage by mass: 25-28wt% of bio-based resin, 8-12wt% of a noise reduction material, 15-20wt% of nano composite rubber particles and 5-8wt% of internally mixed reflective glass beads. The bio-based resin is used as a base material of the hot melt coating, the superfine bamboo fibers and the polyurethane elastomer are combined to serve as noise reduction materials, and honeycomb-shaped pores with the diameter of 0.1-1 micron exist in the superfine bamboo fibers, so that a coating produced by construction of the hot melt coating has good noise reduction performance; meanwhile, coarse-grade glass beads and fine-grade glass beads are introduced into the material, the coarse-grade glass beads provide basic light reflection, gaps are filled with the fine-grade glass beads to form a compact reflection layer, the coarse-grade glass beads and the fine-grade glass beads synergistically act to enable incident light to generate a composite effect of diffuse reflection and specular reflection, the retroreflection coefficient of the coating is increased by utilizing the effect, the light reflection performance in rainy days is further improved, and the safety is improved; and the hot-melt coating mostly adopts an environment-friendly material, is easy to degrade and is beneficial to environment protection.

The invention discloses an efficient three-dimensional scene anti-rendering method and system based on a multi-view image and a storage medium, and the method comprises the steps: employing a neural symbol distance function network as a geometric model to represent a scene geometric structure of the multi-view image, decomposing a neural radiation field into a diffuse reflection field and a specular reflection field, in combination with the self-shielding probability of the mirror reflection field, the diffuse reflection field, the mirror reflection field and the self-shielding probability of the mirror reflection field, calculating color information of the spatial points and optimizing the geometric model; a material network is adopted to represent albedo and roughness and obtain material information, color information cached in a neural radiation field, an illumination visibility function and direct illumination are introduced, global illumination of each light ray is calculated, importance sampling and illumination Monte Carlo integral are combined to obtain a rendering result, and the material network and a direct illumination network are optimized; and on the basis of the geometric structure, the material information and the illumination information obtained by the decoupled geometric model, the material network and the direct illumination network, a high-quality image is generated by adopting rendering pipeline calculation.

The invention provides a multi-source radiation coupled target infrared polarization characteristic inversion method. The method comprises the following steps: S1, acquiring temperature parameters of a background, a target and an incident source, an angle parameter of the incident source and a surface material parameter of the target; s2, calculating the equivalent black body radiation brightness of the background, the target and the incident source; s3, calculating a first specular reflection heat radiation component and a second specular reflection heat radiation component; s4, calculating a first diffuse reflection heat radiation component and a second diffuse reflection heat radiation component; s5, calculating a self-heating radiation component of the target; s6, obtaining three parameters in a reflection Stokes vector according to the first specular reflection thermal radiation component, the second specular reflection thermal radiation component, the first diffuse reflection thermal radiation component, the second diffuse reflection thermal radiation component and the target self-heating thermal radiation component; and S7, obtaining the target polarization degree of the target according to the three parameters. The method has the beneficial effect that the accuracy of target infrared polarization feature inversion can be improved.

The invention discloses a borehole optical image crack intelligent quantification method for diaphragm wall quality evaluation, belongs to the technical field of diaphragm wall quality, and aims to solve the problems of difficulty in micro crack identification, high subjectivity of geometric feature quantitative judgment and low detection efficiency in manual detection. Comprising the following steps: acquiring a high-definition image of a borehole wall, eliminating mirror reflection through adaptive homomorphic filtering, and generating an illumination invariance image; inputting a U-Net + + network (a crack segmentation model) fused with a histogram of oriented gradient enhancement module, and identifying a result containing width; a crack pixel of 0.1 mm; the length, the bifurcation angle and the tendency are calculated through fracture topology connectivity analysis; predicting a potential penetration path in combination with a soil stress field model; calculating an index representing the integrity of the diaphragm wall according to the segmentation result, the geometric features and the potential path; and generating a crack risk assessment report based on the index.

There is provided a component for a light control device. The component comprises a first serrated structure. The first serrated structure has an array of active faces and a respective array of passive faces. Each passive face comprises a first layer having at least one structural feature configured to suppress the specular reflection of ambient light incident thereon.

A measuring apparatus includes an illuminator including a light source to emit light onto an object being conveyed in a conveyance direction; a first diffuser plate; a second diffuser plate between the first diffuser plate and the object; a light shield portion between the second diffuser plate and the object; and a light receiver to receive light specularly reflected from the object illuminated by the illuminator. The light shield portion has an opening that includes an optical axis of light emitted from the light source and reaching the second diffuser plate.

The invention relates to a method for calculating the degree of polarization of complex space debris, in particular to a method for calculating the degree of polarization of complex space debris based on a micro-facet pBRDF model, and solves the technical problem that an existing method for calculating the degree of polarization is poor in authenticity and accuracy. According to the complex space debris polarization degree calculation method based on the micro-facet pBRDF model provided by the invention, aiming at the characteristics of multi-shape and multi-material coupling of complex space debris, on the basis of the modeling thought of complex refractive index, specular reflection, diffuse reflection and volume scattering of different structural materials of the complex space debris; the albedo projection area is adopted as a reflection contribution coefficient calculated by the total light intensity of reflected light of the complex space debris, and a micro-surface element pBRDF model of different structures and different reflection contribution coefficients of the complex space debris is established, so that the model is closer to the multi-shape and multi-material characteristics of the real space debris; and the polarization degree of the complex space debris calculated based on the micro-facet pBRDF model is more accurate.

The present invention relates to a spectrometer device (130) for obtaining at least one item of spectral information on at least one object (110) by spectral measurement, wherein the spectrometer device (130) comprises: (1) at least one sample interface (132), wherein the sample interface (132) defines a measurement surface, wherein the measurement surface is configured for defining a measurement pose of the object (110), particularly during the spectral measurement, wherein the measurement surface further defines an x- y- plane and, thereby, defines an x-axis (134) and a y-axis (136); (2) at least one light emitting element (138), wherein the light emitting element (138) is configured for emitting illumination light (140) for illuminating the at least one object (110) in order to generate detection light (142) from the at least one object (110), wherein the incident illumination light (140) has an angular distribution θI(0X, 0y) on the sample interface (132) causing an angular distribution θI'(0x, 0y) of Specular Fresnel reflected light on the sample interface (132); wherein θx is an angle between a projection of a nominated light ray of the light described by the respective angular distribution projected in an x-z-plane and a projection of a normal on the measurement surface in the x-z-plane, wherein θy is an angle between a projection of a nominated light ray of the light described by the respective angular distribution projected in the y- z-plane and a projection of a normal on the measurement surface in the y-z- plane; (3) at least one detector (144), wherein the detector (144) is configured for generating at least one detector signal when receiving the detection light (142) from the object (110) in order to obtain the item of spectral information, wherein the detection light (142) received by the detector (144) has an angular distribution θC(θX, θy) on the sample interface (132); wherein the spectrometer device (130) is configured for the angular distribution θC(θX, θy) and the angular distribution θI'(θX, θy) to be at least partially separated.

The invention discloses a visual inspection sorting method and system for surface defects of intelligent electric meter shell injection molded parts, and relates to the technical field of visual inspection, and the method comprises the following steps: selecting an intelligent electric meter shell as a reference part, dividing the surface of the shell into a plurality of functional partitions, collecting structured light form and brightness information, and obtaining a reference appearance map; and positioning a to-be-detected electric meter shell to a position consistent with the reference part, obtaining the online three-dimensional form and brightness response of each functional zone, mapping the online three-dimensional form and brightness response to the reference appearance map, marking a stable mirror surface with high brightness, and interpolating along an observation track to generate an online appearance map. According to the invention, through functional partition sampling layout of a window sealing area, a wiring terminal area, a stud and reinforcing rib area, a nameplate and two-dimensional code area and a general decoration side wall area, and in cooperation with double-light-source collection of diffused light and oblique incident light combined with structured light, a reference appearance map containing a highlight tolerance mask is constructed; stable characterization of mirror reflection and a transparent window is realized, and false detection caused by high brightness of the mirror surface is remarkably reduced.

The invention belongs to the field of semiconductor metering, and discloses an X-ray critical dimension system calibration method, which comprises the following steps of: firstly, moving a group of oppositely moving slit blade edges of high-flux small-angle X-ray scattering instrument equipment, recording flux change, and calibrating the relative distance of the initial positions of the group of slit blade edges; setting a slit opening, and calibrating the positions of the slit center and the light beam center; then adjusting the grazing incidence angle of the sample until the intensity peak of the specular reflection light coincides with the Yoneda peak of the critical angle, and recording the incidence angle at the moment as the critical angle; recording light spots of an incident light beam directly irradiated on the detector, comparing scattered light spots with different pitch angles, and calibrating the pitch angle corresponding to the light spots on the same horizontal plane as the direct light spots as a pitch angle zero position; and finally, a light spot of the detector is observed, when a complete semicircle is formed, the semicircle is calibrated as an azimuth angle zero position, different azimuth angle values are obtained through building and combining, and the in-situ calibration requirements of rapid, non-destructive and accurate measurement of the three-dimensional morphology of the complex IC nano-structure are met.

A measuring apparatus includes an illuminator and a light receiver. The illuminator includes a light source to emit a light beam to an object conveyed in a conveyance direction; and a diffuser plate to diffuse the light beam emitted from the light source to illuminate a surface of the object with a diffused light beam. The light receiver receives reflection light specularly reflected from the surface of the object illuminated by the illuminator. A conditional expression below is satisfied:L1>L2whereL1 denotes a distance between the light source and the diffuser plate, andL2 denotes a distance between the diffuser plate and the surface of the object.

The invention discloses a space scattering light field distribution measurement method, which realizes measurement of space scattering light field distribution, and specifically comprises the following steps: S1, a tested sample or a reference sample close to ideal mirror reflection is not placed at a test position, a light source enters at a first angle, and a detector receives and measures light radiation from different angles to obtain light source light field distribution; s2, placing a tested sample at the test position, enabling the light source to enter at a second angle, receiving and measuring light radiation passing through the tested sample from different angles by the detector, and obtaining scattered light field distribution of the tested sample; and S3, decoupling the scattered light field distribution of the tested sample by using the light field distribution of the light source to obtain the corrected scattered light field distribution of the tested sample. According to the invention, the influence of the measurement system on the material scattering light field distribution test is eliminated, and the two-dimensional display detector is introduced for receiving, so that the measurement is more accurate. The method is especially obvious in effect on samples with higher specular reflection or higher transparency.

This three-dimensional measuring device comprises a projecting unit that projects a prescribed striped pattern toward a target region, an imaging unit that images an object, on which the prescribed striped pattern is projected, and outputs event data, a measuring unit that measures the three-dimensional shape of the object, and a projection control unit that controls the projection unit, wherein: the measuring unit comprises a determining unit that determines whether a captured image generated from the event data includes a region in which specular reflection is occurring, a detecting unit that detects an imaging pixel group, of the imaging unit, that imaged the region in which the specular reflection is occurring, in the captured image that is determined, by the determining unit, to include a region in which specular reflection is occurring, and an identifying unit that identifies a projection pixel group, of the projecting unit, that is a projection region corresponding to an imaging region formed by the imaging pixel group detected by the detecting unit; and if the determining unit has determined that a region in which specular reflection is occurring is included, the projection control unit projects the prescribed striped pattern with the projection pixel group identified by the identifying unit in an extinguished state.

The invention discloses a composite aluminum foil current collector coating thickness detection device, and relates to the technical field of coating thickness detection, the composite aluminum foil current collector coating thickness detection device comprises a thickness detection member, the thickness detection member comprises an upper wheel set, a lower wheel set, a detection rack and a laser detector, and the upper wheel set and the lower wheel set are respectively penetrated by an upper shaft and a lower shaft; the detection frame and the lower shaft rotate synchronously to change the inclination angle of the laser detector, and the tensioning wheel can ascend and descend to be used for adjusting the tightness of the composite aluminum foil on the lower wheel set. The two sides of the aluminum foil are clamped and the aluminum foil is transversely stretched, so that the aluminum foil is flatly attached to the measuring wheel. It is ensured that the aluminum foil is in a flat, tight and vibration-free state when passing through a laser measurement point, which is the premise of obtaining accurate measurement data. The whole laser detection frame can be used as a whole, the lower shaft supported by the aluminum foil synchronously rotates to change the angle of incident light, so that a specular reflection light path of ambient light deviates from the laser receiver, laser beams can still keep nearly vertical incidence, and reflected light of the laser beams can be effectively received.

The invention discloses an agricultural plant protection unmanned aerial vehicle path planning method and system, and relates to the technical field of agricultural unmanned aerial vehicle flight control, and the method comprises the following steps: S100, constructing an illumination and time sequence observation layer, collecting an incident angle, a polarization parameter and brightness gradient information from an operation environment, generating a light spot risk baseline according to the information, and establishing a time anchor point for dynamic identification. According to the method, a light spot risk baseline is constructed based on multi-source illumination, mirror reflection is stripped, abnormal tracks are identified, false obstacles are calibrated, a reverse illumination mask is generated to serve as a path boundary, task perception information is fused to update weights, differential privacy is introduced to correct deviation, and a reverse phase light graph and a shadow beacon are combined. Dynamic traction and closed-loop regulation and control of an unmanned aerial vehicle path are realized, and planning precision and flight safety are improved.

The invention discloses a humidity response discoloration radiation refrigeration material which comprises a scattering layer and an iridescent photon film arranged on the surface of the scattering layer, the iridescent photon film is a cellulose nanocrystal / polyethylene glycol composite film, and the scattering layer is a polylactic acid-silicon dioxide-aluminum oxide composite nanofiber film. Through the composite design of the top cellulose nanocrystal / polyethylene glycol iridescent photon film and the bottom PLA / SiO2 / Al2O3 scattering layer, coupling of color mirror reflection of the color radiation refrigeration function layer constructed by CNC / PEG composite and broadband diffusion response of the electrostatic spinning film reflecting layer is achieved, and the negative effects of moisture absorption and color development on the reflectivity are reduced; color intelligent response and efficient radiation refrigeration are successfully combined; the preparation method is simple in process, the adopted raw materials are all degradable and renewable materials, the cost is low, and industrial popularization and application are easy.

A component for a light control device comprises a first serrated structure having an array of active faces 902 and a respective array of passive faces 904. Each passive face comprises a first layer 1

To provide a measuring apparatus capable of improving accuracy in measuring an object to be measured.SOLUTION: The measuring apparatus according to one aspect of the present invention is a measuring apparatus for measuring an object to be measured conveyed in a conveying direction, and includes: an illumination unit for illuminating the object to be measured and a light receiving unit for receiving specularly reflected light from the object to be measured illuminated by the illumination unit. The illumination unit includes: a light source including a plurality of point light sources; and a first diffusion plate, the light source being arranged in a plurality along a predetermined arrangement direction, the plurality of point light sources being arranged in an orthogonal direction orthogonal to the arrangement direction. When the diffusion angle of the first diffusion plate in the arrangement direction is defined as Ax and the diffusion angle in the orthogonal direction is defined as Ay, the relationship of Ax<Ay is satisfied.SELECTED DRAWING: Figure 4

The present application provides a switchgear condensation monitoring method, device, electronic device, and storage medium, relating to the field of power monitoring technology. The method utilizes a laser to scan the condensation monitoring area on the top of the switchgear. The laser generates different types of optical signals based on the surface state of the condensation monitoring area, receives the optical signals, and collects light intensity information of the optical signals to determine whether condensation is present in the condensation monitoring area. The method also detects the first reception time of mirror-reflected light and the second reception time of refracted light, as well as the incident angle of the mirror-reflected light and the refraction angle of the refracted light, and determines the thickness of water droplets. Operation and maintenance responses are then prioritized based on whether condensation is present in the condensation monitoring area and the thickness of the water droplets. Thus, by collecting the intensity of reflected light and calculating the thickness of water droplets, the condensation situation inside the switchgear can be accurately reflected, improving the accuracy of condensation monitoring while also providing comprehensive early warnings and facilitating efficient maintenance.

The invention discloses a disease prediction system and a disease prediction method based on urine image recognition, which are used for analyzing the physical properties of a urine sample by measuring the optical properties (such as reflectivity, polarization state and the like) of the urine sample by using a polarized light technology so as to realize the prediction and early detection of diseases. The light source module achieves time-sharing excitation through LED sets arranged in an annular array, mirror reflection components are separated in real time based on a polarization filter in a reflection suppression mode, a light source is directly driven to close a decision, a real-time closed loop from optical perception to light source control is formed, and dynamic liquid level reflection noise is eliminated from the source. The image acquisition module is combined with an ambient light differential compensation mechanism, and the angle of a polarization filter and a light source is cooperatively calibrated, so that the system stably works under a non-camera obscura condition; the control module dynamically adjusts the detection frequency based on the liquid level curvature change rate, the urine image color fidelity and the disease prediction accuracy are improved, meanwhile, user operation inclination tolerance is compatible, and the use reliability is improved.

To increase resolution and restrain time required for measuring distance by focusing on a subject even if the subject is photographed from an oblique direction in an imaging system and a distance measurement system using a variable focusing lens.SOLUTION: A first imaging device 1 includes: a first light source section 12 for applying pulsed light L1 to a subject A1; an angle adjustment section 121 for changing an angle θ of a light axis direction of the first light source section 12 relative to the subject A1; and a light axis correction section 43. The light axis correction section 43 extracts the light quantity of a regular reflection component and the light quantity of a diffusion reflection component from a first pixel signal outputted from a first imaging section 11 for imaging the subject A1 via a first variable focusing lens 111, and calculates a range θC of an angle θ at which the quantity of a regular reflection component becomes equal to or more than the quantity of light of a diffusion reflection component and the quantity of a regular reflection component becomes close to the maximum value.SELECTED DRAWING: Figure 1

A multilayer coating film includes a lustrous layer containing a luster material, and a colored layer stacked on the lustrous layer, containing a reddish coloring agent, and having translucency. For the lustrous layer, when a light incident angle (an angle with respect to a line perpendicular to the surface of the lustrous layer) is 45° and L*(θ) represents the L* value of the lightness index of reflected light measured at a light receiving angle (the angle of inclination toward a light source side from a specular reflection direction) θ, L*(θ) at 45°≤θ≤80° and 100°≤θ≤110° is 10 or less, and when the luster material is projected onto the bottom surface of the lustrous layer, the percentage of the projected area of the luster material on the bottom surface is 3% or more to 70% or less per unit area.

This invention discloses a robust method, device, and storage medium for laser spot recognition and tracking in complex lighting environments, belonging to the field of computer vision and target detection. Addressing the problems of high false alarm rates and poor robustness in existing methods under interference such as strong ambient light, dynamic projector flicker, and specular reflection, this invention proposes a multi-layered processing framework of "detection-verification-tracking." First, adaptive threshold segmentation is performed on the current frame image to extract candidate regions with brightness higher than the background. Second, multi-dimensional feature verification is introduced. Based on the inherent physical properties of the laser spot (such as spectral matching degree, shape and size, and two-dimensional Gaussian intensity distribution) and temporal motion patterns, candidate regions are jointly verified and filtered to effectively remove various homogeneous and heterogeneous interferences. Finally, through a multi-target trajectory management module, the filtered candidate spots are correlated with historical trajectories (e.g., using the Hungarian algorithm), and combined with Kalman filter prediction and state machine-based trajectory lifecycle management (temporary, confirmed, lost, terminated), stable tracking and output of the laser spot are achieved. This invention does not rely on a large amount of training data, has high computational efficiency, and can significantly improve the accuracy and robustness of laser spot recognition under complex dynamic lighting conditions, providing a reliable front-end perception guarantee for vision-based high-precision laser spatial positioning and interaction systems.

This invention discloses a bimetallic hybrid metasurface that achieves polarization-selective absorption and tunable liquid immersion. The metasurface consists of a three-layer structure: a bimetallic hybrid layer, a silicon dioxide layer, and a silver reflective layer. The bimetallic hybrid layer is composed of aluminum and titanium nanoribbons. The bimetallic hybrid metasurface achieves perfect absorption of incident light under x-polarized light at the resonant wavelength and specular reflection of incident light under y-polarized light, thus exhibiting a high extinction ratio. Furthermore, the absorption peak wavelength of the metasurface can be continuously and dynamically tuned by adjusting the unit period of the metasurface or by utilizing active tuning through liquid immersion. The bimetallic hybrid metasurface proposed in this invention achieves high-contrast polarization-selective absorption and possesses advantages such as simple structure, ease of integration, and dynamic tunability, thus it can be widely applied in practical applications such as novel optical polarizers and photodetectors.

Processing sound signals acquired by at least one microphone, to locate a sound source emitting from a plurality of discrete positions at respective discrete points in time, in a space comprising at least one planar reflective surface. The method includes: obtaining: a first vector {right arrow over (u)}0(k) determining a direction of a first acoustic path, direct between the source and the microphone, a second vector {right arrow over (u)}n(k) representing a second acoustic path resulting from a specular reflection and arriving at the microphone, and a delay τn(k) of second path at the microphone, compared to the direct path; exploiting a property of the specular reflection according to which a Euclidean distance between two positions of the source at two discrete points in time is equal to a Euclidean distance between two respective positions of images of the source and derived from one or more same reflections, respectively at said two discrete points in time.