24 results about "Wavelength scale" patented technology

The invention provides a multifunctional passive cooling optical metamaterial fiber, yarn and fabric and a preparation method thereof. The passive cooling optical metamaterial fiber is composed of high-refractive-index inorganic micro-nano particles and / or a micro-nano functional material and a polymer substrate material. Wherein wavelength / sub-wavelength scale micro-nano particles are uniformly distributed in a substrate material as a random scattering medium to form a random optical metamaterial system, and reflection enhancement of the optical metamaterial fabric in a solar spectrum band is realized by utilizing a multiple Mie resonance collective effect. According to the passive cooling optical metamaterial fiber, a circular structure, a skin-core structure and the like are prepared through melt spinning, high-refractive-index inorganic micro-nano particles are added into a skin layer and used for sunlight band wide spectrum regulation and control, and a micro-nano functional material is added into a core layer, so that multiple functions are effectively achieved.

The invention relates to the field of industrial visual inspection, and discloses a material surface defect detection system based on industrial visual inspection, which comprises a laser light source module, a light beam distribution assembly, a dark field illumination structure, a near field irradiation structure, an industrial visual inspection module, a signal processing module and a data processing module. The laser light source module is used for generating a modulated laser beam, and the laser beam distribution assembly guides the laser beam to the surface of a material; and the dark field illumination structure is matched with the near field irradiation structure to form an irradiation path with an inclined direction and a sub-wavelength scale. The industrial visual inspection module comprises an industrial camera, an image acquisition device and an image processing module and is used for acquiring and processing images of the defect area. The signal processing module is used for performing frequency domain analysis on the scattered signals; and the data processing module is used for analyzing spatial positions and forms of defects based on image and signal data. The system is suitable for fine detection and structure identification of tiny defects on the surface of a material.

The application relates to a laser surface periodic structure construction method based on geometric structure guidance, and belongs to the field of laser micro-nano processing. The method first constructs a geometric structure with characteristic size and spatial arrangement on a material surface, and the geometric structure is obtained through mechanical processing, high-energy beam processing or other forming methods; then under the condition of random polarization or circular polarization laser irradiation, the geometric structure modulates the near-surface electromagnetic field distribution, thereby forming a periodic micro-nano structure. By adjusting the size, spacing and arrangement form of the geometric structure, controllable construction of one-dimensional gratings and two-dimensional array structures can be realized. The period of the formed structure is related to the wavelength of the incident laser, and satisfies the near-wavelength scale relationship (Lambda approximately 0.8-1.2 lambda), and can be adjusted by adjusting the wavelength of the laser. The method can realize large-area periodic structure preparation, and the process is relatively simple, and is suitable for surface optical regulation and functional interface construction.

The invention relates to the technical field of micron-sized droplet jet flow and ink jetting, in particular to an acoustically-driven micro-droplet jetting method and device, and the method comprises the steps that to-be-jetted liquid is stably conveyed to a nozzle micropore assembly; generating an ultrasonic signal, and driving an ultrasonic transducer after power amplification; the resonant vocal cavity nozzle is driven by the ultrasonic transducer, and a stable standing wave sound field with a sub-wavelength scale is formed in the cavity; acoustic radiation force is used for acting on a liquid column at the end of the spray head, and non-contact separation and directional spraying of liquid drops are achieved. The nozzle is controlled by the multi-axis motion platform to move on the substrate, so that liquid drops are deposited according to a preset track. According to the method and the device, the problems of nozzle blockage and the like caused by high viscosity or high solid content of liquid in a traditional piezoelectric or electrofluid driving mode are solved; the control precision of the liquid drop size and the spraying speed can be remarkably improved, and the device has excellent fluid adaptability and spraying stability and is particularly suitable for precise deposition and graphical jet printing of complex fluid such as photoresist, metal slurry and functional nano materials.

The present invention relates to the field of electromagnetic wave imaging technology, and discloses a subwavelength imaging system and method based on a laser-induced plasma probe. The imaging system includes a laser control module, a high-resistance semiconductor substrate, a microwave near-field scattering module, and a data acquisition module. The laser control module is composed of a laser, a galvanometer, and a lens assembly. The laser, the galvanometer, the lens assembly, the high-resistance semiconductor substrate, and the microwave near-field scattering module are arranged in sequence, and the microwave near-field scattering module is connected to the data acquisition module. The imaging method includes forming a transient plasma area; setting the number of scanning points of the data acquisition module and setting the scanning matrix; controlling the galvanometer to jump the laser spot to the current coordinate point; and the data acquisition module collecting the reflection parameter S of the current point signal. 11 ; Reflection parameters S of all scan points collected 11 The present invention realizes non-contact high-resolution imaging at a sub-wavelength scale, and improves system stability, compatibility and scanning efficiency.

The present application relates to the field of micro-droplet jet and inkjet technology, and particularly relates to an acoustic driving micro-droplet jetting method and device, which comprises: stably delivering a liquid to be jetted to a nozzle micro-hole assembly; generating an ultrasonic signal, which drives an ultrasonic transducer after power amplification; driving the resonant acoustic cavity nozzle through the ultrasonic transducer to form a stable sub-wavelength scale standing wave acoustic field in the cavity; using the acoustic radiation force to act on the liquid column at the end of the nozzle to realize the non-contact separation and directional jetting of the droplet; and moving the nozzle on the substrate through a multi-axis motion platform to realize the deposition of the droplet according to a predetermined track. The method and device avoid the nozzle blockage and other problems caused by the high viscosity or high solid content of the liquid in the traditional piezoelectric or electrohydrodynamic driving mode; can significantly improve the control accuracy of the droplet size and jetting speed, have excellent fluid adaptability and jetting stability, and are particularly suitable for the precise deposition and patterning jetting of complex fluids such as photoresist, metal paste and functional nanomaterials.

The invention discloses a miniaturized large-aperture refraction-super hybrid thermal imaging refraction-super hybrid lens and a thermal imager, and belongs to the field of optical lenses, and the lens comprises a first lens and a second lens which are sequentially arranged from an object plane to an image plane along an optical axis. According to the invention, a folding and super hybrid system is formed by combining a super-surface lens and a traditional lens, the super-surface can flexibly regulate and control the characteristics of phase, amplitude, polarization and the like of light waves on the sub-wavelength scale, and mature micro-nano processing technologies such as electron beam lithography, nano-imprinting and the like and diversified materials are adopted; the characteristics help to reduce the size and weight of the lens of an optical system, reduce the cost of raw materials, and realize the miniaturization, light weight and integrated design of thermal imaging equipment.

A spectrometer device (110) for obtaining spectroscopy information about at least one object (112), the spectrometer device (110) comprising: i. At least one light source (114) for generating illumination light (116) for illuminating the object (112), the light source (114) comprises at least one light emitting diode (118) and at least one luminescent material (120) for light conversion of primary light generated by the light emitting diode (118); 10 ii. At least one detector (128) for detecting the light (116, 130, 256) and thereby generating at least one detector signal; iii. At least one evaluation unit (136) configured to derive spectroscopy information about the object (112) from the at least one detector signal, the evaluation unit (136) being configured to derive spectroscopy information about the object (112) by taking into account the wavelength correction information.

The invention relates to the technical field of acoustic holographic transmission, and relates to a high-data-density acoustic holographic transmission method and system under a limited space bandwidth product. The method comprises the steps of obtaining a target image and generating an amplitude hologram; based on a physical model of sound wave propagation, establishing a coupling relation model between the complex sound pressure amplitude and the phase of the amplitude hologram; inversely inverting the amplitude hologram based on a time inversion principle, and inversely solving focusing phase distribution corresponding to the low-information-density amplitude hologram through a horny lizard optimization algorithm according to the coupling relation model; coupling the amplitude hologram with low information density with focusing phase distribution to generate a coupling amplitude hologram with high information density; and reconstructing a high-data-density sound field based on the high-information-density coupling amplitude hologram. According to the method, the diffraction limit of sound waves on the wavelength scale is successfully overcome, and super-focusing sound field reconstruction under the condition of low information density is achieved. In addition, the method can realize high data density sound field transmission even under the condition of low information density. The research provides a new insight for far-field acoustic super-resolution imaging and low-density information transmission, and has huge application potential in the fields of medical ultrasonic imaging, remote acoustic communication and the like.

The wavelength calibration device and method of the solar Halpha space telescope belong to the field of space optics, effectively overcome the shortcomings of traditional wavelength calibration based on a monochromator, low spectral resolution and weak monochromatic energy. The wavelength calibration device comprises a wavelength tunable laser with high monochromaticity, high energy and ultra-narrow line width performance, a collimator, a wavemeter, a high-precision two-dimensional turntable and the like, and meets the wavelength calibration requirements of a spectral imaging system with very high spectral resolution, and is widely applied in the development, adjustment and detection of the solar Halpha space telescope, and has equal important application value in the wavelength calibration of future spectral imaging systems with very high spectral resolution, and has wide engineering application prospect.

The invention relates to the technical field of electromagnetic wave imaging, and discloses a sub-wavelength imaging system and method based on a laser-induced plasma probe. The imaging system comprises a laser regulation and control module, a high-resistance semiconductor substrate, a microwave near-field scattering module and a data acquisition module, the laser regulation and control module is composed of a laser, a galvanometer and a lens assembly, the laser, the galvanometer, the lens assembly, the high-resistance semiconductor substrate and the microwave near-field scattering module are sequentially arranged, and the microwave near-field scattering module is connected with the data acquisition module. The imaging method comprises the following steps: forming a transient plasma region; setting the number of scanning points of the data acquisition module, and setting a scanning matrix; the galvanometer is controlled to jump the laser spot to the current coordinate point; the data acquisition module acquires a reflection parameter S11 of a current point signal; and performing unified processing on the acquired reflection parameter S11 data of all the scanning points. According to the invention, the non-contact high-resolution imaging of the sub-wavelength scale is realized, and the stability, compatibility and scanning efficiency of the system are improved.

An endoscope illumination device and a method thereof. The endoscope illumination device comprises a light source assembly, an optical cable assembly, and a planar optical element. The light source assembly is configured to emit illumination light. The optical cable assembly has an incident end and an emission end, and the incident end of the optical cable assembly corresponds to the light source assembly, configured to transmit the illumination light emitted by the light source assembly from the incident end to the emission end. The planar optical element is correspondingly arranged at the emission end of the optical cable assembly, and the planar optical element comprises a substrate layer and at least one super-structured surface layer, wherein the at least one super-structured surface layer is formed on the substrate layer in a superposed manner, and each super-structured surface layer is composed of an arrangement of micro-nano antennas in a sub-wavelength scale, configured to regulate the illumination light emitted from the emission end of the optical cable assembly to achieve a uniform illumination effect in a large field of view.

The invention provides an acoustic metamaterial suitable for a leading edge slat, a design method and the slat, and belongs to the field of aircraft noise reduction. The acoustic metamaterial comprises a plurality of acoustic metamaterial subunits, and each subunit is composed of a micro-perforated plate and a cavity. And at least one of the plurality of subunits is linear and the internal channel of the cavity is linear, and at least one of the plurality of subunits is curved and the internal channel of the cavity is curved. The linear and curved subunits form a conformal unitary structure by an adaptive arrangement including profile adaptation within the airfoil profile and location distribution and combination within a profile perpendicular to the airfoil profile and along the leading and trailing edges. According to the invention, extremely limited space in the slat is utilized to the maximum extent through conformal design, a sound wave propagation path is prolonged at a sub-wavelength scale through linear and curved cavity channels, efficient low-frequency sound absorption is realized, broadband noise is covered through combination of multiple subunits, and the problem of insufficient low-frequency sound absorption in a slat space in a traditional scheme is effectively solved.

The utility model discloses a superlens light splitting imaging system, the optical elements of which comprise two biconvex lenses, an aspheric reflector bent towards the light incident direction and a reflective plane dispersion superlens, and the aperture diaphragm of the system is arranged at the reflective plane dispersion superlens. After passing through the entrance slit, incident light is transmitted, passes through the first biconvex lens and is reflected by the aspheric reflector, and reflected light enters the reflective plane dispersion super lens, enters the aspheric reflector after being split by the reflective plane dispersion super lens, is reflected by the aspheric reflector and reaches the detector through the second biconvex lens. The primary mirror of the spectroscopic imaging system provided by the utility model adopts a free-form surface shape, and the reflection-type plane dispersion super lens with a square titanium dioxide nano-column unit structure with a sub-wavelength scale is used as a spectroscopic element, so that the spectroscopic imaging system has the advantages of high spatial and spectral resolution, small system size and the like, can be used in the fields of hyperspectral detection of unmanned aerial vehicles and the like, and has wide application prospects. The application prospect is wide.

The invention discloses a large-frequency-ratio heterogeneous scaling model common-aperture antenna array, which relates to the technical field of antennas, and specifically comprises a three-waveband scaling array antenna layer, a circuit integrated architecture layer and all-waveband component layers which are connected in sequence. The antenna layer comprises an S-waveband antenna array, a K-waveband antenna array, a Ka-waveband antenna array and three kinds of media which are arranged in a coplanar mode, and a nested layout that holes are dug in the first medium to accommodate the second medium and holes are dug in the second medium to accommodate the third medium is adopted. The antenna layer establishes low-loss vertical connection with the component layer through glass through hole technology interconnection of the circuit layer and a radio frequency micro-spring vertical interconnection structure. And Ka, K and S radio frequency components are vertically stacked in the component layer from top to bottom. By using the wavelength scaling array and heterogeneous integration, the physical size is compressed, and the isolation and radiation efficiency are improved.

The application provides a super-structured optical fiber for generating a spindle beam and an optical acoustic endoscopy imaging system, the super-structured optical fiber comprising a fiber body and a super-structured optical structure arranged at an exit section of the fiber body, the super-structured optical structure comprising an optical expander and a super-structured structure array arranged at the end of the optical expander; the super-structured structure array is periodically arranged by super-structured units in a sub-wavelength scale, and the super-structured unit is in the form of a regular quadrangular prism; by clear phase modulation and parameter optimization, the super-structured optical structure is integrated at the end face of the fiber body, the emission light wave front is accurately regulated, a long focal depth spindle beam is obtained under the condition of a limited aperture and a compact structure, and the problem that the focal depth is limited in optical acoustic endoscopy imaging is effectively relieved; based on the combination of Bessel beams and the lateral spot size, the application maintains a high lateral resolution ability while extending the focal depth, avoids the defect that the resolution is significantly reduced in the traditional zooming scheme, and improves the imaging consistency and the signal-to-noise ratio.

The invention relates to an electromagnetic inverse scattering imaging method based on a nucleation depth expansion network, and belongs to the technical field of electromagnetic inverse scattering imaging. A kernel convolution module and a random Fourier feature module are integrated at the bottleneck position of the U-Net network, the kernel convolution module effectively extracts local spatial features of dielectric attributes by integrating a nonlinear kernel function, and the random Fourier feature module realizes efficient capture of global spectrum features through cosine base projection. Therefore, the expression ability of the sub-wavelength structure and the wavelength scale interference mode is considered. Through recursive iteration and end-to-end training of a physical operator, a reconstruction result can be optimized step by step, and organic combination of data driving and physical prior is realized. According to the method, through recursive iteration and end-to-end training, the reconstruction precision, generalization ability and physical consistency are effectively improved, and the method is suitable for the electromagnetic wave imaging fields of medical imaging, nondestructive testing and the like.

The invention discloses a double-layer metasurface structure filter for multicolor visible light communication, the filter is vertically integrated from bottom to top, and upper and lower layer electric field modes of the filter are subjected to coherent superposition and coupling under a phase matching condition to form a new LSPR-GMR mixed mode; the upper-layer metasurface structure is a sub-wavelength scale metal pattern, and the lower-layer metasurface structure is a sub-wavelength periodic unit based on a polycrystalline silicon material; an intermediate dielectric layer is arranged between the upper-layer metasurface and the lower-layer metasurface, physical isolation of the upper-layer metasurface and the lower-layer metasurface is achieved, and the intermediate dielectric layer serves as an energy transfer channel and a mode matcher to achieve efficient coupling between the upper-layer metasurface and the lower-layer metasurface; a substrate is arranged below the lower-layer metasurface, and a silicon wafer is selected as the substrate of the double-layer metasurface filter, provides physical support for the double-layer metasurface structure filter and serves as an active area of a Si-based photoelectric device. According to the invention, efficient and accurate selection of red light, green light and blue light is realized, and technical support is provided for high-performance optoelectronic devices and multi-color visible light communication.

The invention discloses a nonlinear guided wave nondestructive testing method based on an elastic wave metasurface, which comprises the following steps: arranging a metasurface on one side of a preset detection area on the surface of a test panel to be detected, and arranging a piezoelectric exciter on the other side of the detection area; the method comprises the following steps: generating Lamb waves through a piezoelectric exciter, collecting a displacement amplitude response signal on a to-be-detected test plate between two columns of supercells contained in the metasurface, and taking the displacement amplitude response signal as detection data after Fourier transform; and the detection data is compared with baseline data obtained by Fourier transform of an obtained displacement amplitude response signal after the metasurface and the piezoelectric exciter are arranged on the health test panel by adopting the same method as that of the test panel to be detected, so that whether the test panel to be detected has early damage or not is determined. Through the design of the scatterer array under the sub-wavelength scale, material early-stage damage nonlinear signals are greatly enhanced in a millimeter-scale structure, meanwhile, transmission of center frequency guided wave signals is reduced, and the detection signal-to-noise ratio is remarkably improved.

An AESA antenna system with RF Beamformer PCB assemblies includes integrated radiating elements. The system utilizes a swappable PCB assembly with integrated thermal management. Such integrated thermal management may include a heat pipe thermal spreader, compatible with a PCB assembly to create a brick AESA architecture. A card cage and linear array mechanical assembly are configured to host a linear array of PCBs that span the UUBW spectrum within a common mechanical assembly. The PCBs in the brick AESA architecture can be configured / reconfigured within a wavelength scaled aperture (WSA) architecture.

A spectrometer device (110) for obtaining spectroscopic information on at least one object (112), the spectrometer device (110) comprising: i. at least one light source (114) for generating illumination light (116) for illuminating the object (112), the light source (114) comprising at least one light-emitting diode (118) and at least one luminescent material (120) for light-conversion of primary light generated by the light-emitting diode (118);10 ii. at least one detector (128) for detecting light (116, 130, 256) and, thereby, generating at least one detector signal; iii. at least one evaluation unit (136) configured for deriving the spectroscopic information on the object (112) from the at least one detector signal, wherein the evaluation unit (136) is configured for deriving the spectroscopic information on the object (112) by taking into consideration wavelength correction information.

The invention relates to the technical field of blade film hole measurement, in particular to a turbine blade film hole diameter non-contact measurement system and method. According to the technical scheme, the device comprises a tunable laser, a polarization controller, an optical fiber circulator, a vertical coupling echo wall microcavity, a photoelectric detector, a three-dimensional displacement device, turbine blades and a double-shaft turntable. Wherein the output end of the tunable laser is connected with the input end of the polarization controller. According to the invention, through the evanescent field sensitive characteristic of the sub-wavelength scale echo wall microcavity probe, the nanoscale precision non-contact measurement of the aperture of the turbine blade air film hole is realized, and the industrial measurement problem caused by contact damage, optical diffraction limitation and insufficient industrial CT precision of a micropore with a large depth-diameter ratio is solved in a breakthrough manner; on the premise of zero damage, the detection precision is improved to the nanometer level, and meanwhile, by means of a miniaturized optical fiber system and a double-shaft dynamic calibration structure, the complex deep hole detection cost is remarkably reduced, and second-level efficient measurement is achieved.

The present invention discloses a metamaterial photonic crystal fiber for effective broadband dispersion compensation transmission. The metamaterial photonic crystal fiber includes a core (1) and a cladding (2). The cladding has five layers of air holes, including an innermost circular structure air hole (3), a second-layer circular structure air hole (4), third and fourth-layer circular structure air holes (5), and an outermost circular structure air hole (6). The core is a solid region located at the center of the optical fiber body. The air holes in the cladding are arranged in a hexagonal radial pattern around the outer circumference of the core, forming a two-dimensional photonic crystal structure in the cross-section of the photonic crystal fiber. The dielectric constant changes periodically at the wavelength scale, enabling the light wave propagating therein to have a band structure. By only changing the parameters of the five layers of circular structure air holes in the cladding, the performance of the cladding can be adjusted like that of a single material, thereby realizing the functions of smooth dispersion, adjustable dispersion compensation, and reduced confinement loss in a broadband range.

According to the additive manufacturing method for improving the powder absorptivity through the ultrafast laser in-situ induction microstructure, metal powder is pretreated in a selected area through ultrafast laser, a micro-nano structure close to the ultrafast laser wavelength scale is manufactured on the surface of the metal powder, the micro-nano structure can generate the near-field enhancement effect on common near-infrared laser, and the powder absorptivity is improved through the near-field enhancement effect on the common near-infrared laser. The near-infrared laser absorption rate of metal powder can be effectively increased, long-pulse laser or continuous laser is allowed to melt the area with low power, severe flowing and splashing of a molten pool caused by excessive heat input are avoided, and formation of internal air holes is reduced. The heat accumulation of peripheral materials is reduced, the thermal gradient is favorably controlled, and the residual stress is reduced; a large amount of powder is prevented from adhering to the surface and surface quality is improved.