1680 results about "Light wave" patented technology

The invention discloses a thyroid intraoperative real-time navigation method and a thyroid intraoperative real-time navigation system based on multi-mode optical fusion. The thyroid intraoperative real-time navigation method comprises the following steps: outputting visible light through an endoscope and coupling light waves of a narrow-band multispectral light source to irradiate an operative field, exciting parathyroid glands to generate near-infrared fluorescence, and receiving reflected visible light, split light, near-infrared fluorescence and laser speckle signals through an endoscope probe. And separating the composite optical signal into four channels, and respectively generating an anatomical structure color image, a blood vessel spectroscopic image, a parathyroid gland near-infrared fluorescence image and a laser speckle image. Performing decorrelation processing on the laser speckle image to generate a blood flow dynamic pseudo-color decorrelation speckle image; an anatomical structure, a blood vessel center line, a parathyroid gland contour and blood flow dynamic feature points are extracted through a multi-modal registration technology, after affine transformation space alignment is conducted, a comprehensive imaging map containing the anatomical structure, blood vessel distribution and parathyroid gland function marking information is generated through a wavelet fusion algorithm, and intraoperative multi-dimensional real-time tissue navigation is achieved.

Some implementations described herein provide techniques and apparatuses provide a semiconductor device including a photonics device having a backside transmissive region and methods of manufacturing. The semiconductor device includes a first semiconductor device stacked over a second semiconductor device, where the first semiconductor device includes a photodiode structure and the second semiconductor device includes the backside transmissive region. The backside transmissive region, which is below the photodiode structure of the first semiconductor device, includes a trench structure having highly reflective structures and / or properties to maintain an optical power of light waves propagating through the backside transmissive region. An absence of structures within the trench structure lessens a likelihood of interferences which may cause a transmission loss (e.g., a reflection loss, an absorption loss, a scattering loss, and / or a mode mismatch loss) relative to another transmissive region that is adjacent to the photodiode structure.

The invention provides an anti-falling detection unit, a photovoltaic panel cleaning robot and an anti-falling detection method.The anti-falling detection unit comprises a substrate, an ultrasonic sensor and at least one laser sensor, the ultrasonic sensor is arranged on the substrate, and each laser sensor is arranged on the substrate; the at least one laser sensor and the ultrasonic sensor are arranged at intervals in the first direction. According to the anti-falling detection unit, the ultrasonic sensor and the laser sensor are used at the same time, the ultrasonic detection mode and the light wave detection mode are combined, comprehensive detection of the edge and the gap of the photovoltaic panel is achieved, the accuracy and the reliability of signals are improved, the problem of false alarm possibly caused by a single sensor is effectively avoided, and the detection efficiency is improved. The photovoltaic panel cleaning robot is simple in structure and convenient to operate, work interruption caused by signal abnormity can be reduced, the photovoltaic panel cleaning robot can be prevented from falling off and can cross gaps between different photovoltaic panels to complete cleaning work of the multiple photovoltaic panels, and the work efficiency of the photovoltaic panel cleaning robot is improved.

The invention discloses a scanning method and system based on pre-scanning and dynamic optimization, a medium and equipment, and the method comprises the specific steps: a pre-scanning step: carrying out the preliminary scanning of a file through light sources with different wavelengths through a multispectral scanning technology, and obtaining image information containing visible light and invisible light wave bands; a pre-scanning analysis step: based on a deep learning image analysis algorithm, analyzing a preliminary scanning image in real time, and identifying a file type, a non-uniform illumination region and a potential scanning problem; a light supplement adjustment step: dynamically adjusting the brightness, angle and spectral range of a light supplement lamp according to the pre-scanning analysis result; a high-precision scanning step: performing high-precision formal scanning to obtain a scanning image; and a post-processing step: based on AI denoising, sharpening, color correction and semantic analysis, generating an optimized scanning file. According to the method, dynamic adaptation to different document features can be realized through setting of the pre-scanning analysis step and the light supplementing adjustment step, and the scanning quality and efficiency are remarkably improved.

The invention relates to the technical field of image processing, and discloses an image correction method and system for binocular diffraction AR intelligent glasses. The method comprises the following steps: calculating a dispersion response parameter of a diffractive optical element in the AR glasses in a visible light wave band; respectively carrying out dispersion distortion detection on the left eye image and the right eye image in the AR glasses to obtain a left eye dispersion distortion feature and a right eye dispersion distortion feature; interpupillary distance change data of a user is obtained, effective aperture offset calculation is carried out on the diffractive optical element, and interpupillary distance compensation parameters are obtained; performing coupling calculation on the left eye dispersion distortion feature, the right eye dispersion distortion feature and the interpupillary distance compensation parameter to obtain a binocular dispersion correction matrix; and performing dispersion compensation on the left eye image and the right eye image to obtain a dispersion correction image, and outputting the dispersion correction image to a display module of the AR glasses. The method can respond to the pupil distance change of the user in real time, automatically adjust dispersion correction parameters, realize accurate and comprehensive dispersion correction, and ensure the stability of dispersion correction performance.

The invention discloses a digital twinborn intelligent travel management system and method, and relates to the technical field of travel interaction, and the method comprises the following steps: building a multi-projection unified phase baseline and energy distribution auditing model, carrying out the nanosecond-level synchronous sampling of the phase difference and brightness change curve of a plurality of projection light waves in a virtual-real superposition region, and carrying out the nanosecond-level synchronous sampling of the phase difference and brightness change curve of the multi-path projection light waves in the virtual-real superposition region; generating a corresponding initial light field energy coupling matrix; and constructing an interference trajectory inversion network based on the initial light field energy coupling matrix, and replaying the light wave superposition sequence by using a time inversion algorithm. According to the invention, accurate monitoring and active regulation and control of light field energy are realized through unifying a phase baseline and energy auditing, interference focusing and brightness mutation are effectively eliminated, and visual stability and immersion experience are improved; and energy self-adaptive balance and dynamic closed-loop control are realized through phase conjugate driving and spectrum inverse diffusion gating, so that safe operation of a light field and soft and stable brightness are ensured, and a comfortable and healthy digital twinborn travel light environment is created.

The invention relates to the technical field of chip preparation, and provides a chip based on an annular photonic crystal and a preparation method thereof. The preparation method comprises the following steps: growing a nucleating layer on a substrate; growing a superlattice structure on one side, away from the substrate, of the nucleating layer; sequentially growing an n-type coating layer, an n-type waveguide layer, a quantum well and a p-type electron blocking layer on one side, deviating from the nucleating layer, of the superlattice structure; etching a plurality of annular cavities on the p-type electron barrier layer to form an annular photonic crystal; growing a p-type extension contact layer on one side, deviating from the quantum well, of the p-type electron blocking layer; and carrying out in-situ annealing treatment. According to the preparation method, the directivity of the photonic band gap can be effectively adjusted, uniform light waves in all directions on the side face can be formed, so that leakage of laser from a non-light-emitting area on the side face is restrained, the light emitting efficiency is improved, the annular photonic crystals are periodically distributed, and the light beam quality is effectively guaranteed.

The invention discloses an intelligent seabed energy detection system and method based on visible light communication, and belongs to the technical field of deep sea detection, the detection system comprises a data acquisition system (1) and a visible light communication system (2), the data acquisition system (1) structurally comprises a high-definition camera (11), an underwater sensor (12) and a first analog-to-digital converter ADC (13), the visible light communication system (2) structurally comprises a transmitting end and a receiving end; the detection method comprises the steps of front-end acquisition, signal conversion, signal processing, optical signal transmission and signal restoration. The characteristics of high frequency and large bandwidth of light waves are utilized, the intensity of light is modulated, binary code element signals are converted into optical signals, the optical signals are received through the photoelectric detector for underwater information transmission, efficient and real-time submarine energy monitoring and analysis are achieved, and comprehensive technical support is provided for development and utilization of submarine energy.

An optical modulator with which electrical connection between a signal electrode and signal wiring of a wiring substrate can be reliably made even in a case where a width of the signal electrode in an action portion of an optical control substrate is narrow is provided. An optical modulator includes an optical control substrate (1) that includes an optical waveguide (OW) including at least a branched waveguide which branches one light wave into two light waves, and that includes a control electrode for applying an electrical field to the branched waveguide, and a wiring substrate provided with a wiring which relays an electrical signal to be applied to the control electrode or with a wiring which terminates the electrical signal, in which the control electrode is provided with a signal electrode(S), the wiring is provided with signal wiring, and in a part (Sc) in which electrical connection is made between the signal electrode(S) and the signal wiring, a clearance (W1) in which the branched waveguide (OW) sandwiches the signal electrode is wider than a clearance (W2) in which the branched waveguide sandwiches the signal electrode in an action portion in which the control electrode applies the electrical field to the branched waveguide.

A method for processing a radar signal based on a photonic fractional Fourier transformer comprises: transmitting a linear frequency modulation signal to targets to be detected, receiving echo signals of the targets to be measured, and loading the linear frequency modulation signal and the echo signals onto a single-frequency optical wave by an electro-optical modulator (S1); respectively biasing a sub-modulator and a parent modulator of the electro-optical modulator at different bias points, modulating the single-frequency optical wave by the electro-optical modulator based on the linear frequency modulation signal and the echo signals, and outputting a modulated optical signal (S2); converting the modulated optical signal by a photoelectric detector to a photocurrent (S3); and performing Fourier transform on the photocurrent to obtain a fractional Fourier spectrum, and obtaining distance information of the targets to be measured according to peak positions of each pulse signal in the fractional Fourier spectrum (S4).

The invention relates to the technical field of space detection, and particularly provides an optical imaging and radar detection common-aperture imaging system, which comprises a coaxial reflector group with common aperture for light waves and microwaves, a radar feed source, an optical imaging system and a frequency division light splitting element for separating the light waves and the microwaves, and the coaxial reflector group and a radar feed source form a microwave transmitting and receiving antenna which is responsible for transmitting and receiving microwaves, light waves collected by the coaxial reflector group are reflected to the optical imaging system by the frequency division light splitting element for optical imaging, and the microwaves are transmitted to the radar feed source for radar detection after passing through the frequency division light splitting element. According to the invention, the common aperture design of optical imaging and radar detection is realized, the radar feed source and the optical imaging system are arranged at the same side of the coaxial reflector group, the system complexity is reduced, and in addition, the problem that the optical imaging quality is reduced due to multi-stage diffraction of the metal grating is solved by adopting a light splitting and frequency division mode of transmitting microwaves and reflecting light waves.

The invention provides a strip mine area automatic extraction method based on a convolutional neural network and an attention mechanism, and the method comprises the steps: carrying out the data preprocessing, and constructing multispectral data containing a vegetation index and a plurality of wavebands; a strip mining area extraction model is set, a double-branch encoder structure is constructed in the strip mining area extraction model, a main encoder in the double-branch encoder structure inputs the visible light wave band of the remote sensing image to extract geometric and texture features, and an auxiliary encoder fuses the near-infrared wave band and the vegetation index to extract vegetation features; high-level features output by the double-branch encoder are input into a cavity space convolution pooling pyramid module, and multi-scale context information is integrated; constructing a decoder containing a depth supervision mechanism, and setting an attention segmentation head at the tail end of the decoder; and training the strip mining area extraction model by adopting the dynamic weighted mixed loss function, and outputting an automatic extraction result of the strip mining area based on the trained model. According to the invention, rapid and accurate extraction of the strip mine area can be realized.

The present invention discloses a nanoparticle transport device, comprising a silica substrate, a droplet-shaped gold nanoarray, polarized light waves, and nanoparticles; the silica substrate serves as a substrate; the droplet-shaped gold nanoarray is disposed on the silica substrate and serves as a driving unit, interacting with the polarized light field to form an excited local electric field to capture and directionally transport nanoparticles; the polarized light wave is used to provide a light source, interacting with the droplet-shaped gold nanoarray to generate an evanescent field; the nanoparticles serve as the objects to be captured and transported; the droplet-shaped gold nanoarray includes a periodically arranged droplet-shaped plasma gold nanostructure, which is composed of a droplet-shaped tail and a circular body, and the transport direction of the nanoparticles forms a certain angle with the droplet-shaped tail. The present invention can achieve more stable capture with lower light power, and also enables the device to achieve highly operational transport of target particles.

The invention provides an electro-optical modulator combining a slow light waveguide and a capacitive load type traveling wave. The electro-optical modulator comprises the slow light waveguide, a capacitive load type traveling wave electrode, a multi-mode interferometer, a mixed single-mode waveguide, a micro-ring structure and a micro-ring upper phase adjusting electrode. Capacitive load type traveling wave electrodes are arranged between and on the side edges of a pair of slow light waveguides which are arranged in parallel, the two ends of the slow light waveguides are connected to one end of a multimode interferometer through mixed single-mode waveguides respectively, the other end of the multimode interferometer is provided with two ports, one port is used for being connected with a micro-ring structure, and the other port is used for being connected with a micro-ring structure. The other port is used as the input end or the output end of the electro-optical modulator, and the two sides of the micro-ring structure are provided with micro-ring upper phase adjusting electrodes. The group refractive index and the working bandwidth of light can be regulated and controlled by adjusting the geometric parameters of the slow light waveguide, and low dispersion and high group refractive index can be realized in a wide optical bandwidth range; through a sectional capacitance load type slow wave electrode structure, the regulation and control of the microwave refractive index are realized, and the electro-optical modulation bandwidth is improved.

A semiconductor device inspection method includes: selecting, for a semiconductor device including at least one layer, a target layer on which inspection and measurement are to be performed; selecting a material to fill a hole region formed inside the semiconductor device; conducting a simulation for an optical inspection and a measurement for the semiconductor device; selecting, based on the simulation, a wavelength band of light for the optical inspection and the measurement; and detecting, through the light at the selected wavelength, a lower portion of the semiconductor device and a defect of the semiconductor device. A refractive index of the material filling the inside of the hole region is greater than a refractive index of a molding layer surrounding the outside of the hole region.

The embodiment of the invention provides an optical waveguide detection system and detection method. The optical waveguide detection system comprises: a light source assembly comprising a multi-axis mechanical arm and a light source module, wherein the multi-axis mechanical arm adjusts the light emitting angle of the light source module; the to-be-tested sample assembly comprises a bearing assembly, a profiling workpiece and a to-be-tested optical waveguide, and the profiling workpiece calibrates setting parameters of the to-be-tested optical waveguide; the to-be-measured optical waveguide is arranged on the bearing assembly, and light emitted by the light source module enters the to-be-measured optical waveguide to form a rainbow pattern; the shooting assembly is used for acquiring a rainbow pattern image formed by light rays of different light emitting angles received by the optical waveguide to be measured; the control module is used for controlling the bearing assembly to move to pass through the profiling workpiece so as to calibrate setting parameters of the optical waveguide to be measured, and the control module is used for controlling the light source assembly to emit light to the optical waveguide to be measured at a preset light emitting angle so as to obtain a rainbow pattern image shot by the shooting assembly; and determining parameters of the rainbow pattern image according to different preset light emitting angles.

The invention provides an electro-optical modulator and a modulation method thereof, the electro-optical modulator comprises a substrate, a buried oxide layer and a lithium niobate waveguide layer are sequentially stacked on the substrate, and the lithium niobate waveguide layer comprises a first optical waveguide and a second optical waveguide; the electrode layer comprises a composite traveling wave electrode and a direct-current electrode, and the direct-current electrode is arranged on one side, in the signal transmission direction, of the composite traveling wave electrode; wherein the composite traveling wave electrode comprises a metal electrode and a polymer electrode, the metal electrode is embedded into the buried oxide layer, the polymer electrode is arranged on the surface of the buried oxide layer, and the composite traveling wave electrode is arranged between the first optical waveguide and the second optical waveguide and arranged on the side faces of the first optical waveguide and the second optical waveguide respectively; wherein the direct current electrode is arranged between the first optical waveguide and the second optical waveguide. The electro-optical modulator is high in electro-optical conversion efficiency, the plasma effect caused by light field coupling is effectively avoided, and the light loss of the device is remarkably reduced.

The invention relates to the field of image recognition, discloses an image recognition method and an image recognition system, and systematically solves the core pain point of traditional document recognition through optical-topology fusion processing and a dynamic resource allocation mechanism. The image recognition method is composed of an acquisition module, a grid module, a phase module, a setting module and a distribution module, pixel brightness is calculated and coded based on document RGB data, and a two-dimensional coding matrix is generated; constructing a geometric correction grid, forming a nonlinear constraint field, and enhancing the anti-deformation capability of the image; generating spiral phase light waves in the constraint field by using a spatial light modulator, and generating a time-varying phase map; determining a local topology index by detecting the number of phase jump times; and extracting the closed boundary region as a character block, and generating an analysis result file. The system breaks through traditional limitation, improves image geometric correction precision, feature extraction sensitivity and boundary judgment accuracy, efficiently completes document analysis, and is suitable for scenes such as document digitization and information retrieval.

The invention discloses a cross-medium wearable audio transmission system and a transmission method thereof, which are suitable for audio communication scenes in an air and water body junction environment such as a natatorium. The system comprises a shore transmitting terminal and an underwater receiving earphone, and adopts a blue-green light wave band as a transmission carrier to realize cross-medium wireless transmission of audio signals. The transmitting terminal comprises an audio preprocessing module, a modulation and driving module and a coarse-fine composite light beam alignment module; the receiving earphone comprises an optical receiving module, a posture sensing and aligning module, a signal processing module and a bone conduction audio output unit. According to the system, through a dynamic attitude compensation and light beam alignment mechanism, the audio transmission rate greater than or equal to 1Mbps in a 10-meter range is realized, the error rate is less than or equal to 1 * 10 <-6 >, and the transmission delay is less than 50ms. The method has the advantages of high communication quality, strong anti-interference capability, good wearable performance and the like, and is suitable for scenes of underwater training, voice guidance, immersive audio playing and the like.

The invention discloses a dynamic tunable zero-level electro-optical wave plate system, a device and a preparation method, and belongs to the technical field of optical devices. The invention provides a dynamic tunable zero-order electro-optical wave plate system, and the system comprises a zero-order electro-optical wave plate device which comprises a wave plate substrate made of an electro-optical crystal of a non-centrosymmetric structure, and an electrode disposed on the wave plate substrate; the output end of the adjustable voltage source is electrically connected with the electrode; wherein the adjustable voltage source is configured to be capable of outputting a half-wave working voltage corresponding to a target working wavelength, so that the zero-order electro-optical wave plate device works at the target working wavelength as a half-wave plate. According to the invention, self-adaptive matching of a single device to a plurality of working wavelengths is realized, the problem that the working wavelength of the device is single due to material dispersion is solved, and meanwhile, the processing difficulty of an ultrathin structure required by a specific wave band is avoided.

The invention relates to the technical field of medical data processing and nerve regulation and control, in particular to a method for synchronously activating post-stroke neuroplasticity through photoacoustic, which comprises the following steps of: 1, constructing a stroke specific brain region target map: fusing brain structure connection data and functional network data of a patient, generating a three-dimensional target map containing the high-metabolism semi-dark band coordinate set and the cross-hemisphere compensatory connection intersection; 2, calculating a time-space synchronization focusing parameter; 3, synchronous stimulation and dynamic regulation are executed, wherein the ultrasonic transducer and the laser source are controlled to emit time-space synchronous sound waves and light pulses; monitoring the blood perfusion variable quantity and the neurotransmitter concentration ratio of the target brain area in real time; when the blood perfusion variable quantity does not reach the expectation or the transmitter ratio is unbalanced, the stimulation intensity is dynamically adjusted, and the focusing coordinate is translated in the direction away from the infarction area. Through photoacoustic stimulation of time-space synchronization, the difference between the propagation speeds of sound waves and light waves is overcome, and accurate collaboration of neural restoration is achieved.

The utility model discloses a distributed sound wave sensing system for multi-frequency pulse modulation, and relates to the technical field of distributed sound wave sensing. The system comprises a narrow linewidth laser, an optical fiber coupler, a polarization-maintaining optical isolator, an acousto-optic modulator, a polarization-maintaining delay optical fiber, an erbium-doped optical fiber amplifier, a polarization-maintaining dense wavelength division multiplexer, an optical fiber circulator, an optical fiber Bragg grating, a piezoelectric transducer, a polarization controller, a photoelectric balance detector, a data acquisition card, an arbitrary waveform generator and the like. According to the utility model, the multi-frequency delay ring is utilized to carry out multi-frequency modulation, the frequency number of light waves is increased along with the circulation times of the light waves in the delay ring, and under the condition that the utilization of a large-bandwidth electro-optical modulator is not increased, the flexible modulation of the frequency is realized by utilizing a low-bandwidth acousto-optical modulator without being influenced by carrier frequency and sidebands of each order; the low-bandwidth acousto-optic modulator is used for frequency modulation in the multi-frequency delay ring, and compared with an electro-optical modulation or multi-acousto-optic / multi-light source modulation scheme, the modulation cost is effectively saved.

The invention relates to a preparation method of a visible and near-infrared dual-band high-transmittance transparent conductive film, which is characterized by comprising the following steps of: (1) preparing an ITO (Indium Tin Oxide) film on a transparent substrate by adopting a magnetron sputtering process, and sputtering and depositing the ITO film with the thickness of 200-1000nm; and (2) placing the substrate on which the ITO film is deposited in a high-temperature furnace for rapid heating heat treatment, and cooling after heat treatment. The preparation method has the advantages that the preparation method is simple, and rapid batch production can be realized in combination with an existing magnetron sputtering system; the average transmittance of the transparent conductive thin film prepared by the method reaches 70%-75.1% at the wave band of 1.1-2.5 microns, the average transmittance of the visible light wave band is not lower than 84%, and the sheet resistance is 20-35 omega / sq.

The invention belongs to the technical field of photovoltaic modules, and relates to a photovoltaic module, a preparation method thereof and a photovoltaic system, and the photovoltaic module comprises a battery piece layer which comprises a plurality of battery pieces which are connected with one another; the back surface of the battery piece layer comprises a coating layer, a grid line, a first adhesive film layer and a first cover plate which are stacked in sequence; a hollow reflective material layer is also arranged between the coating layer and the first adhesive film layer, the average reflectivity of the reflective material layer in a visible light wave band is greater than or equal to 30%, and the coverage area of the reflective material layer in the back surface of the battery piece layer is less than or equal to 70%. The reflective material layer is additionally arranged on the back of the photovoltaic module, so that the double-sided power generation capability is considered while the back color difference is effectively eliminated, and the photovoltaic module is particularly suitable for distributed application scenes.

The invention relates to the technical field of spot-size converters, and discloses a lithium niobate film spot-size converter with an asymmetric trident structure and a preparation method of the lithium niobate film spot-size converter with the asymmetric trident structure. The lithium niobate film waveguide layer is positioned on the insulating layer; the silicon dioxide layer is coated on the lithium niobate film waveguide layer; the silicon nitride waveguide layer is located on the silicon dioxide layer; the silicon nitride waveguide layer comprises a first waveguide part, a second waveguide part and a third waveguide part which are connected in sequence in the direction from the input end to the output end of the lithium niobate film spot size converter, and the first waveguide part, the second waveguide part and the third waveguide part are located on the same plane; in the light wave transmission direction, the transverse size of the second waveguide part is sequentially increased, and the transverse size of the third waveguide part is sequentially reduced; according to the invention, the process preparation difficulty is low, high-efficiency coupling with the coupling efficiency of more than 90% from the silicon nitride waveguide to the lithium niobate waveguide can be realized, and the optical fiber coupling alignment tolerance and overlay tolerance as well as the overall coupling efficiency of the spot size converter are improved.

The invention relates to a wind speed measurement system and method based on a homologous isomorphic light wave wind finding radar, and the system comprises a photo-generated millimeter wave signal source module which employs a first laser and a second laser to carry out beat frequency to generate photo-generated millimeter waves, obtains a local oscillator signal based on the photo-generated millimeter waves, and obtains local oscillator light based on the second laser; the millimeter-wave radar wind measurement transceiving module is used for radiating photo-generated millimeter waves to a target space, receiving echo signals, mixing the echo signals with local oscillation signals and outputting intermediate-frequency signals; the laser radar wind measurement receiving and transmitting module is used for transmitting second laser to a target space, receiving echo light and performing coherent beam combination on the echo light and local oscillation light of the second laser to output an electric signal; the signal processing module receives the intermediate-frequency signals and the electric signals and calculates the comprehensive wind speed based on the intermediate-frequency signals and the electric signals. Compared with the prior art, the invention provides a simplified and more flexible homologous laser-millimeter wave signal generation method, and more accurate and reliable wind measurement can be realized.

A hollow-core optical fiber (HCF) configured to guide light waves through anti-resonance, the hollow-core optical fiber comprising a tubular glass sheath; a hollow core defined in the central inner cavity of the sheath and having a polygonal shape in a cross section; and a cladding located in the central lumen and comprising flat, planar glass films, each having two opposing edges extending along the length of the HCF, a film thickness lt; the films are arranged in a plurality of groups, each group comprising: a core boundary film defining one side of a polygonal shape; and at least one cladding film between the core boundary film and the sheath, all films in the group being spaced apart; wherein each side of the polygonal shape is formed by a core boundary film, each film being anchored to the sheath only along its two opposite edges, and there is no contact between any films.

The invention relates to the technical field of fire early warning, in particular to a fire extinguishing system based on a multi-modal sensor and a multi-stage linkage control method.The fire extinguishing system based on the multi-modal sensor comprises a multi-spectral light source module, the multi-spectral light source module is configured to emit a dual-wavelength light beam with a preset divergence angle, the first wavelength # imgabs0 # is located in the visible light wave band, and the second wavelength # imgabs1 # is located in the near-infrared wave band; a temperature gradient sensor array and a scattering angle adjustable photoelectric detector array are arranged in the composite detection cavity, the temperature gradient sensor array comprises miniature thermocouple groups which are distributed in a spatial orthogonal manner, and the photoelectric detector array comprises a multi-angle receiving unit which can slide along a spherical track; the matrix eliminates coupling interference of a temperature field on scattering characteristics of smoke particles through a dual-wavelength phase locking algorithm; according to the scheme, the dynamic coupling interference of the temperature field and the scattering characteristic can be fundamentally solved.

The utility model discloses equipment for cleaning a spinning hot roller by using laser. The equipment comprises a moving trolley; the laser cleaning device is used for laser cleaning of the hot roller; and the assisting manipulator is arranged on the moving trolley and is used for carrying the laser cleaning device to the hot roller. Cleaning equipment can be rapidly moved to a cleaning station, an operator can also conveniently and rapidly enter the roller, operation is convenient, and the cleaning efficiency is greatly improved. In addition, the surface of the workpiece is irradiated by high-energy laser beams, so that dirt, rusty spots, coatings or residues on the surface are instantly evaporated after absorbing laser energy or generate expansion stress to be stripped under the impact of light waves, and therefore, attachments on the surface of a cleaned object are effectively removed at a high speed, and the purpose of cleaning is achieved.

The embodiment of the invention discloses a preparation device and method of a volume holographic grating. The device comprises a coherent light source used for generating coherent light with the coherent length larger than the optical path difference of the grating recording device; the beam expanding and splitting device is used for expanding and splitting the coherent light into object light and reference light with the same polarization direction; the control unit is used for decomposing the volume holographic grating into a plurality of volume holographic sub-gratings related to the grating position; the light modulator unit is used for modulating complex amplitude distribution of an object light wave surface to obtain object light with certain complex amplitude distribution, and the object light with certain complex amplitude distribution and the reference light interfere to form stripes with light intensity distribution corresponding to the volume holographic sub-grating; a light transmission unit for transmitting the object light having a certain complex amplitude distribution and the reference light to a recording medium; and the spatial position adjusting unit is used for bearing the recording medium and adjusting the position of the recording medium according to the signal from the control unit, so that the recording medium records stripes corresponding to the position according to the position to obtain the volume holographic grating.