588 results about "High reflectivity" patented technology

The invention discloses a passive radiation refrigeration coating and a preparation method thereof, and relates to the technical field of industrial coatings. Comprising a fluoroacrylate emulsion, hollow glass beads, nano titanium dioxide, flaky silicon dioxide aerogel powder, polytetrafluoroethylene micro powder, hydroxyl-terminated polydimethylsiloxane, a hydroxyl acrylic acid modified silane coupling agent, a super-hydrophobic modified fluorosilicone surface additive, nano cerium oxide, aluminum fluoride doped zinc oxide infrared enhancement powder and deionized water. The paint is prepared on the basis of the formula. According to the invention, a multi-scale spectrum regulation and control and surface self-cleaning system is constructed cooperatively, so that the synergistic effect of high reflection of a sunlight region and high emission of a middle infrared region is realized. The coating can maintain continuous passive refrigeration in a day and night period, the surface of the coating has self-cleaning capability and excellent ultraviolet aging resistance, and high reflectivity and high radiation emissivity can be maintained for a long time in a complex outdoor environment, so that the thermal management efficiency of buildings and equipment is remarkably improved.

The invention discloses a reflective steel pipe weld defect identification method based on a multimode spectrum chromatography technology, and provides a detection process of multiband reflection data acquisition, denoising and normalization, multi-region feature distribution modeling, sparse reconstruction separation abnormal response, multi-scale contrast weighted enhancement, significant layered imaging and defect classification and discrimination. According to the method, through the measures of automatic partitioning, environment and material dynamic acquisition, self-adaptive parameter optimization and the like, high-reflection interference is effectively suppressed, the distinguishing between defects and backgrounds is remarkably enhanced, and the detection sensitivity and the positioning precision of the small and micro defects are improved.

The invention provides a circuit board and a preparation method thereof and a backlight module, the circuit board comprises a circuit substrate and a reflection structure layer located on at least one surface of the circuit substrate, the reflection structure layer covers at least part of a circuit layer of the circuit substrate, and the reflection structure layer comprises a reflection layer and a transparent photosensitive layer which are sequentially stacked on the surface of the circuit substrate. The transparent photosensitive layer covers the outer surface of the reflecting layer. According to the circuit board provided by the invention, the surface of the reflecting layer is coated with the transparent photosensitive layer, so that the thickness and flatness of the reflecting structure layer can be improved, the light loss is reduced, the reflectivity and uniformity are improved, the lateral erosion size of the bottom of the reflecting layer is reduced, and the risk that the reflecting layer falls off is reduced.

The invention provides high-reflectivity coated glass and a preparation method thereof. The high-reflectivity coated glass comprises a glass substrate, and an antioxidant dielectric layer, a reinforced dielectric layer, a metal layer and an outer dielectric layer which are sequentially arranged on the glass substrate, and the reinforced dielectric layer comprises a first dielectric layer and a second dielectric layer which are arranged in sequence. According to the coated glass provided by the invention, through specific dielectric layer structure combination, the reflectivity of the coated glass is improved, the transmittance is reduced, and the coated glass has good oxidation resistance, scratch resistance and heat-resistant processability, is simple in preparation process and has a wide application prospect.

The invention belongs to the field of composite materials, and particularly relates to a nanofiber radiation refrigeration heat insulation film with a bionic multilayer structure. The device sequentially comprises a bionic anti-reflection layer, a solar spectrum reflection layer, a nanofiber porous heat insulation layer and an atmospheric window radiation layer from outside to inside, the bionic anti-reflection layer is a sub-wavelength nano bulge array simulating a moth eye structure and is formed on the outer surface of the solar spectrum reflecting layer; the solar spectrum reflecting layer is a polymer film doped with high-reflectivity nanoparticles; the nanofiber porous heat insulation layer is a porous membrane formed by interweaving polymer nanofibers prepared by an electrostatic spinning technology; the atmospheric window radiation layer is a functional layer formed by coating or blending high-emissivity inorganic nanoparticles on the inner surface of the nanofiber porous heat insulation layer; the film integrates bionic antireflection, high sunlight reflection, efficient heat radiation and physical heat insulation, and efficient, stable and flexible daytime radiation refrigeration is achieved.

The invention provides a preparation method of a surface structure of a back contact battery, which relates to the technical field of back contact batteries, and comprises the following steps: S1, carrying out double-sided polishing on the surface of a silicon wafer: firstly carrying out rough polishing, removing a damaged layer on the surface of the silicon wafer, then cleaning with acid and ozone, then carrying out fine polishing, then cleaning with a mixed solution of hydrogen peroxide and alkali, and then carrying out acid pickling with ozone, then cleaning with a mixed solution of acid and hydrogen peroxide, and finally washing and drying; sequentially depositing a tunneling oxide layer and amorphous silicon on a single surface at high temperature; and performing high-temperature diffusion on the surface to form a crystallized first semiconductor region and a mask layer BSG. According to the invention, the specific suede structure is formed on the front surface, and the polished surface is formed on the back isolation base region, so that high reflectivity of the back isolation base region is ensured, the specific suede structure on the front surface can be independently designed, and meanwhile, a double-surface ozone oxidation process is added; therefore, the open-circuit voltage and the short-circuit current of the cell are improved, and the photoelectric conversion efficiency of the cell is improved.

The invention provides a surface-emitting gallium nitride VCSEL laser chip and an epitaxial defect suppression preparation method thereof, and relates to the technical field of laser chips, the surface-emitting gallium nitride VCSEL laser chip comprises a substrate, a low-temperature nucleating layer, a high-temperature recovery layer, a stress regulation type nano mask composite defect blocking layer, an n-type nitride DBR reflector, an active region, a polarization enhanced tunnel junction and the like, the defect blocking layer adopts an in-situ silicon nitride nano-porous mask layer to be matched with an aluminum gallium nitride / gallium nitride stress compensation superlattice layer, through pulse type lateral epitaxial overgrowth annihilation penetrating dislocation, and the n-type nitride DBR reflector adopts an AlInN / GaN lattice matching material system to be combined with a hydrogen etching interruption modification technology, so that thick film growth with zero cracks and high reflectivity is realized; a polarization enhanced tunneling junction is used at the top to replace ITO, and the hole tunneling probability is enhanced by piezoelectric polarization in InGaN, so that efficient current injection with low working voltage and no absorption loss is realized, the dislocation density and the device voltage are remarkably reduced, and the yield of an epitaxial wafer and the photoelectric conversion efficiency are improved.

The invention discloses a dynamic self-adaptive radiation refrigeration material which comprises the following components in percentage by mass: 15-30% of matrix resin, 40-60% of a ternary function system, 1-3% of a dispersing agent, 2-5% of a cross-linking agent and the balance of deionized water, the ternary function system is composed of a temperature-sensitive block copolymer, phase change microcapsules and rare earth doped infrared emission particles according to the mass ratio of (1-2): (2-3): (1-1.5). According to the refrigeration material, when the environment temperature is higher than the low critical solution temperature of the temperature-sensitive copolymer, the temperature-sensitive chain segment shrinks to expose the rare earth particles, so that high reflectivity of sunlight and high emissivity of an atmospheric window are realized, and refrigeration is enhanced; when the temperature is lower than the phase-change temperature of the phase-change material, the temperature-sensitive chain segments stretch and wrap the rare earth particles, the infrared emissivity is reduced, heat loss is reduced through phase-change heat release, the dual functions of efficient refrigeration in summer and heat loss reduction in winter are achieved, and the applicability of the coating in an area with the large temperature difference is improved.

A first pumping source and a second pumping source are combined through a pumping beam combiner and are coupled into an erbium-doped fluoride fiber and a high-reflectivity fiber bragg grating, and the erbium-doped fluoride fiber and a low-reflectivity fiber bragg grating form a laser resonant cavity. The intermediate infrared laser is output through the low-reflectivity fiber bragg grating, the cladding light filter and the optical fiber end cap; the high-reflectivity fiber bragg grating and the low-reflectivity fiber bragg grating have the same grating period, the fourth-order harmonic reflection wavelength of the grating is located in the emission spectrum range of transition of erbium ions from the 4F9 / 2 energy level to the 4I9 / 2 energy level, and the fifth-order harmonic reflection wavelength of the grating is located in the emission spectrum range of transition of erbium ions from the 4I11 / 2 energy level to the 4I13 / 2 energy level; by adjusting the power of the first pumping source and the second pumping source, the net gain of laser transitions from the 4F9 / 2 energy level to the 4I9 / 2 energy level and transitions from the 4I11 / 2 energy level to the 4I13 / 2 energy level is regulated and controlled, and switching of laser working wavelengths is achieved.

The invention discloses a preparation method of copper-based composite powder with high infrared laser absorptivity and a reaction device of the copper-based composite powder, and belongs to the technical field of metal additive manufacturing. The preparation method of the copper-based composite powder comprises the following steps that copper powder is subjected to acid pickling pretreatment, Cu2O-coated Cu powder is prepared through air suspension dynamic etching, the Cu2O-coated Cu powder is purified, and the prepared composite powder is of a core-shell structure and comprises a copper core and a cuprous oxide modified shell wrapping the surface of the copper core; by means of the structure, the absorptivity of the copper powder to near-infrared laser of 1064 nm and the like can be remarkably improved to 30% or above, and therefore the problems that pure copper is poor in melting and multiple in forming defect due to high reflectivity in laser additive manufacturing are effectively solved. The composite powder can be directly used for existing selective laser melting or directional energy deposition equipment, has great significance in achieving high-density copper part forming under medium power, and is convenient to prepare, low in cost and high in practicability.

The invention provides an unmanned aerial vehicle inspection tour anti-dazzle visual angle optimization method and system based on background perception. Acquiring a key detection area of the inspection target; candidate shooting poses of the unmanned aerial vehicle are generated for the key detection area; constructing a glare risk function based on the material type parameters, the solar incident angle and the deviation angle between the camera observation direction and the mirror reflection direction; constructing a contrast scoring function based on the brightness corresponding to the background type and the reflection brightness corresponding to the key detection area; a target shooting position is selected according to the glare risk function and the contrast scoring function, and an unmanned aerial vehicle inspection track is generated; the shooting visual angle of the unmanned aerial vehicle is automatically selected and adjusted in a complex natural light environment, the image failure risk caused by high reflection, silhouette and low contrast is reduced, and the detectability of defects of key parts is improved.

The application discloses a kind of low thermal conductivity high reflectivity five-element co-doped ceramic laser protection coating and preparation method thereof, belong to high-energy laser protection technical field.The protective coating includes the adhesive layer and the reflective heat insulation layer of laminated arrangement, adhesive layer is arranged on the surface of base material, reflective heat insulation layer is arranged on the surface of adhesive layer;Wherein, adhesive layer is formed by spraying one of Ni-Al self-bonding powder, Ni-Mo-Al, NiCrAlY, CoCrAlY and NiCoCrAlY;Reflective heat insulation layer is the ceramic coating of five-element co-doped ZrO2, in ceramic coating, base element is ZrO2, doping component is:Y2O3, Gd2O3, Yb2O3, TiO2 And Ta2O5, after doping, material is single cubic phase structure at 25 ℃-1600 ℃.By multiple oxide doping to ZrO2, the coating can maintain cubic phase at room temperature while having lower thermal conductivity and higher reflectivity, can solve the problems of oxidation reflectivity reduction of metal material, mass loss of ablation material and insufficient heat insulation capacity of heat insulation material in laser protection field, prolong service life.

The invention relates to a high-reflectivity high-entropy rare earth phosphate radiation refrigeration pigment, the high-entropy rare earth phosphate radiation refrigeration pigment has a monazite phase with a monoclinic system structure, the chemical formula of the pigment is (A1xA2yA3zA4uA5v) PO4, A1, A2, A3, A4 and A5 are any five rare earth cations of La, Ce, Yb, Gd, Nd and Eu, the cations are in an equimolar ratio, and x, y, z, u and v meet the condition that x + y + z + u + v = 2. Meanwhile, the invention also discloses a preparation method of the high-entropy rare earth phosphate radiation refrigeration pigment. The high-entropy rare earth phosphate radiation refrigeration pigment has high infrared emissivity in air, the emissivity reaches 0.90 or above within the wave band of 8-13 microns, the solar reflectivity reaches 0.93 or above within the wave band of 0.3-2.5 microns, and the high-entropy rare earth phosphate radiation refrigeration pigment has wide application prospects in the fields of building energy conservation, urban heat island effect reduction, photovoltaic power generation efficiency improvement and the like.

The invention provides a welding seam parameter anti-interference measurement method, which comprises the following steps of: acquiring spectrum characteristics of a high-reflectivity surface through a laser scattering technology and Fourier transform processing, matching a correction coefficient, realizing weighted adjustment and geometric parameter extraction of a scattering signal, accurately quantifying a groove size in combination with an edge enhancement algorithm and a three-dimensional contour modeling technology, and accurately measuring the welding seam parameters. Interference such as surface oil stain, corrosion and stripe fracture is effectively overcome by using image filtering, morphological reconstruction and an abnormal value elimination algorithm, and finally, high-precision and anti-interference measurement of the weld groove angle, the truncated edge thickness and the assembly alignment tolerance under high-reflection, corrosion and complex working conditions is realized through multi-source data fusion and self-adaptive calculation range adjustment. And the reliability and the automation level of welding quality detection are remarkably improved.

The invention relates to a packaging structure of a micro display chip and a display device, and the packaging structure comprises a substrate, the surface of which comprises a display area and a non-display area; the electrode pads are located in the non-display area; and a plurality of through hole plugs located in the substrate, wherein one end of each through hole plug is electrically connected with the electrode pad. In AR near-to-eye display application, the light absorption structure can effectively absorb stray light returned from components such as an optical waveguide and the like, secondary specular reflection of the metal electrode pad on the non-display area is avoided, ghosting is prevented from being formed, and the imaging contrast ratio and the picture purity are remarkably improved. The light absorption structure is integrated in the packaging structure, and a stray light feedback path is cut off through a physical means on the premise that normal light emitting of a display area and electrical connection of an electrode pad are not affected, so that the optical performance of the micro-projection ray machine is improved, the final display effect is guaranteed, and the display effect is improved. Therefore, the technical problem of image quality degradation caused by high reflectivity of the non-display area is effectively solved.

The invention discloses a method and a system for detecting the quality of an outer package using a polyurethane coating, and relates to the technical field of outer package material detection. Comprising the following steps: acquiring spectral data of a polyurethane coating outer package; based on the spectral data, extracting coating material information of the outer package; according to the coating material and the discrimination index, correcting the light source attribute and generating correction data; distributing defect grades for the outer package of the polyurethane coating according to the correction data and the discrimination indexes; and obtaining projection data of the outer package of the polyurethane coating at the packaging position. According to the method, the wavelength-reflectivity data matrix is constructed, principal component extraction and curvature feature analysis are performed on the wavelength-reflectivity data matrix, the spectral feature vector representing the coating material is constructed, and then the feature vector is matched with the preset material database, so that the coating material is identified; the problem that in the prior art, the detection accuracy of high-reflectivity coatings such as polyurethane coatings is insufficient is solved, and the reliability of extracting the intrinsic characteristics of materials is remarkably improved.

The invention relates to the technical field of plant root nodule phenotype analysis and image processing, in particular to a root nodule blue light image acquisition and image enhancement processing method and application thereof. The whole image level white reference plate is used as an image acquisition background, the whole original image area except the root nodule body is filled with the reference white plate with high reflectivity and uniform spectral response, and natural illumination drift and color temperature deviation are systematically eliminated in combination with blue channel reflection analysis and pixel level gain correction; through the steps of brightness normalization, adaptive contrast enhancement, edge preservation and noise reduction, semantic mask extraction and image preprocessing for unified standardization of the size, a root nodule feature region with a clear structure can be extracted, a feature recognition enhanced image is generated, and then a root nodule counting analysis model is called to complete accurate counting of root nodules. And the consistency and accuracy of root nodule detection in a complex field environment and under a non-uniform illumination condition can be remarkably improved.

A structured light imaging device, a three-dimensional imaging method therefor, and a storage medium. The structured light imaging device comprises two polarizers which generate polarized light, a light-combining device, and a polarization analyzer, and can suppress high reflectivity and improve the accuracy and integrity of three-dimensional reconstruction. The three-dimensional imaging method comprises: using two rays of polarized light to perform structured light projection so as to obtain a first polarized structured light image and a second polarized structured light image of an imaged object, and separately using the images to perform three-dimensional reconstruction so as to obtain a first height image and a second height image; on the basis of the first polarized structured light image and the second polarized structured light image, determining whether there are multiple reflections on the imaged object surface corresponding to a pixel position, and if not, then determining a final height value of the pixel position on the basis of the height values of the first height image and the second height image at said pixel position, thereby reducing the impact which multiple reflections on the object surface have on reconstruction accuracy and integrity.

The invention provides a high-purity structural color device based on a metasurface and a color developing method, and relates to the technical field of structural color metasurface, the structural color device is a double-layer nanoring array based on an all-dielectric metasurface, adopts an optical design based on Fabry-Perot interference and Mie resonance, and comprises a plurality of structural units, the structure unit comprises a vertical stacking double-layer circular ring structure formed by a tantalum pentoxide Ta2O5 functional layer and a silicon dioxide SiO2 top cover layer, and has sub-wavelength periodic two-dimensional arrangement; through the technical path of the invention, a structural color solution with high purity, wide color gamut and high reflection is provided by utilizing the wide band gap characteristic and high-quality manufacturing capability of Ta2O5. The application scenarios include but are not limited to high-end displays, optical sensors, information encryption and precision optical elements, and brand new possibility is provided for development of the next generation of photonics technology.

An LED includes a first composite layer on a first of its doped layers. Primary vias extend through the first composite layer, through the first doped layer and active region of the LED, and into a second doped layer thereof. A second composite layer (TCO, dielectric, multilayer reflector, and metal layers) is positioned on the second doped layer within the primary vias, on lateral surfaces of the primary vias, and on portions of the first composite layer. A dielectric spacer layer separates the first composite layer, the first doped layer, and the active region from the second composite layer. The TCO layer includes embedded electrical contact areas outside the primary vias, each being separated from the first doped layer by the first composite layer and the dielectric spacer layer. The second composite layer within the primary vias increases LED luminance (by reducing absorption, increasing reflectivity, and reducing darkening or dimming).

The invention provides a reverse printing ink system based on a positive photosensitive mechanism and application thereof. The printing ink system comprises three types of products, namely black matte printing ink, high-reflectivity white printing ink and green printing ink, the production process of the ink system comprises the following steps: 1) synthesizing the film-forming resin; (2) sharing the film-forming resin with a pigment system, a dispersion medium and a functional additive; and 3) applying the reverse ink system to PCB manufacturing. According to the method, the characteristic of'dissolution in an exposure area 'is realized through positive light sensing, and the problems of scanning splicing printing, color difference and insufficient reflectivity in a traditional solder mask process are solved by matching with a special developing solution and a DI exposure light spot shaping technology; compared with the prior art, the reverse printing ink system has the advantages that the yellowing index, the resolution ratio, the heat resistance and the like are remarkably improved, and the reverse printing ink system is suitable for manufacturing a high-end mini LED / micro LED PCB (Printed Circuit Board).

The utility model discloses a reflecting mirror applied to high-power laser, which comprises a base material structure layer, a reflecting dielectric film structure layer is arranged on the reflecting surface of the base material structure layer in a film coating mode, and the reflecting dielectric film structure layer is composed of 46 layers of high-refractive-index film structures and 46 layers of low-refractive-index film structures which are alternately overlapped from inside to outside. The reflector applied to the high-power laser can obtain high reflectivity in the application scene of the high-power laser under the working wave band of 915 + / -10nm, 976 + / -10nm or 1064 + / -10nm. Meanwhile, the dielectric film of the reflector is extremely low in laser absorptivity, and energy loss can be effectively reduced.

The present invention discloses a heterogeneously integrated optoelectronic chip based on an optical through-substrate via (TSV), comprising multiple stacked optoelectronic chips based on the same or different types of substrates, each layer of optoelectronic chips having several optoelectronic devices, and at least one pair of optoelectronic chip layers are attached back-to-back and have an optical TSV with interlayer coupling structures at both ends, so as to establish optical interconnection between at least one pair of optoelectronic devices in different layers. The interlayer coupling structures include coupling gratings with high alignment tolerance, and a high-reflectivity metal film at a certain distance above the grating to achieve efficient unidirectional coupling. The invention solves the technical difficulties of III-V / silicon heterogeneous integration and 3D multi-chip stacking. It achieves interlayer connections through optical TSVs, enabling front electrodes of optoelectronic chips to be used for interconnection with electronic chips, avoiding the fabrication difficulty of electrical TSVs.

A dynamically tunable optical mirror named as a resonant cavity switching (RCS) device and a refractive index modulating (RIM) device are disclosed. The RCS device is comprising a nanoporous piezoelectric III-nitride material layer, such as GaN, AlN, AlScN, AlGaScN or their alloys sandwiched between a high-reflectivity distributed Bragg reflector (DBR) and a lower-reflectivity output DBR. The RIM devise is comprising the nanoporous III-nitride material layer. The nanoporous layer, patterned with interdigital transducers (IDTs), is actuated via surface acoustic waves (SAWs) or electric fields to induce rapid, reversible modulation of its effective refractive index. This enables sub-nanosecond switching between resonant and off-resonant optical states, facilitating efficient energy extraction, optical pulse carving, or phase control.

The utility model discloses a code disc for a reflective encoder, which relates to the technical field of encoder equipment and comprises a glass code disc, a low-reflection film is fixedly connected to the surface of the glass code disc, and a high-reflection film is fixedly connected to one side, far away from the glass code disc, of the low-reflection film. The low-reflection film is formed by plating acid-resistant alkali metal and metal oxide through a vacuum coating machine, the acid-resistant alkali metal comprises niobium, molybdenum, tantalum and hafnium, one of the niobium, the molybdenum, the tantalum and the hafnium is short for H, the metal oxide comprises sio2, sio, al2o3 and zro2, one of the sio, the al2o3 and the zro2 is short for L, and the plating sequence of the acid-resistant alkali metal and the metal oxide is LHLHLHLHLHL, and after the thickness of each layer of the acid-resistant alkali metal and the metal oxide is optimized, the thickness range is 10-150nm, so that the problems that the performance of a traditional material cannot reach an ideal level and the overall effect and the accuracy of equipment are reduced when the traditional glass code disc is in a working environment under high-intensity light or in a scene requiring high reflectivity are solved.

The utility model relates to high-permeability all-light reflection cloth, which belongs to the technical field of all-light reflection cloth and comprises an all-light reflection cloth body, and the all-light reflection cloth body comprises first reflection cloth, second reflection cloth and a high-reflectivity coating. The all-light reflection cloth has the advantages that the all-light reflection cloth body is disassembled into the first reflection cloth body and the second reflection cloth body, so that workers can place the all-light reflection cloth body around crops under the condition that scissors are not needed, and the all-light reflection cloth body can be arranged around the crops through the easy-to-tear strip. According to the full-light reflection cloth body, a worker can cut sleeve holes with corresponding sizes according to the sizes of crop stumps, in the using process of the full-light reflection cloth body, the worker does not need to conduct cutting through scissors in the whole process, time and labor are saved, operation is convenient and fast, when the clamping piece and the clamping groove are in a parallel state, the worker can press the rotating piece to the position below the clamping piece, and the work efficiency is improved. And then the clamping piece is rotated, so that the clamping piece abuts against the rotating piece, and the purpose of fixing the first reflection cloth and the second reflection cloth can be achieved.

The utility model relates to a sewing machine which comprises a rotating shuttle body, a shuttle peg and a detection device. The rotating shuttle body is arranged on the machine body and internally provided with a containing cavity. The shuttle peg is rotatably arranged in the containing cavity in the axial direction of the shuttle peg, the shuttle peg comprises a first panel, a second panel and a shuttle peg shaft, a side face hole is formed in the first panel, and the reflection coefficient of the second panel is larger than that of the first panel; detection signals of the detection device correspond to the side face holes, the detection device collects the detection signals reflected by the first panel or the second panel and generates reflection signals when the shuttle peg rotates, and the rotating speed of the shuttle peg is calculated through the reflection signals. According to the invention, the surface with a high reflection coefficient is arranged on the second panel and is compared with the side surface hole in the first panel, so that the laser sensor can recognize a hole signal more accurately, and the negative influence of high reflectivity of a material on the recognition capability of the sensor is overcome; the technical problem that in the prior art, when a shuttle peg rotates, high reflectivity of the material of the shuttle peg affects the rotating speed detection accuracy is solved.

The invention discloses a short-wave mid-infrared fiber laser and a laser system, and the short-wave mid-infrared fiber laser comprises a pump laser which is used for generating pump light of 980 nm or 1.7 [mu] m; the optical fiber mode field adapter is connected with the optical fiber laser; the high-reflectivity Bragg grating is connected with the optical fiber mode field adapter; the erbium-doped fluoride active optical fiber is connected with the high-reflectivity Bragg grating; the tilted fiber bragg grating is connected with the erbium-doped fluoride active optical fiber and is used for filtering out 2780nm parasitic laser; and the low-reflectivity Bragg grating is connected with the erbium-doped fluoride active optical fiber. According to the technical scheme provided by the invention, the technical problems of limited output power, complex structure and low stability of the technology for generating the laser with the wavelength of 2730nm in the prior art can be solved.

A light-emitting diode (LED) chip with reflective layers having high reflectivity is disclosed. The LED chip may include an active LED structure including an active layer between an n-type layer and a p-type layer. A first reflective layer is adjacent the active LED structure and comprises a plurality of dielectric layers with varying optical thicknesses. The plurality of dielectric layers may include a plurality of first dielectric layers and a plurality of second dielectric layers of varying thicknesses and compositions. The LED chip may further include a second reflective layer that includes an electrically conductive path through the first reflective layer. An adhesion layer may be provided between the first reflective layer and the second reflective layer. The adhesion layer may comprise a metal oxide that promotes improved adhesion with reduced optical losses.

The present application belongs to the technical field of digital twinning, and particularly relates to a three-dimensional digital twinning construction and virtual inspection method for conic landforms. The method comprises: synchronously collecting multi-station site cloud data and multi-station hyperspectral image data when a Beidou satellite positioning system second pulse signal is received by a hardware synchronous trigger through joint calibration of a support; registering the multi-station site cloud data based on a high reflectivity spherical target to obtain a conic landform global point cloud, and mapping the multi-station hyperspectral image data to the conic landform global point cloud based on an external parameter matrix to obtain a conic landform spectral point cloud; initializing and iteratively optimizing a three-dimensional Gaussian ellipsoid set from the conic landform spectral point cloud to obtain a conic landform three-dimensional Gaussian ellipsoid digital twinning model. The present application realizes hardware-level synchronous collection and high-precision fusion of multi-source sensor data, and through a three-dimensional Gaussian ellipsoid expression form, the geometric precision and spectral attribute integrity of the model are taken into account.