18results about How to "Low dispersion" patented technology

The invention provides optical glass, which comprises the following components in molar percentage: 25-40% of SiO2; 1 to 8 percent of B2O3; 1 to 8 percent of La2O3; 1 to 6 percent of BaO; 5 to 25 percent of CaO; 5 to 15 percent of Nb2O5; 8 to 20 percent of TiO2; the content of SiO2 and B2O3 is 27%-45%, and the content of Li2O is 1.5%-15%. The optical glass contains a proper amount of SiO2, alkali metal oxide and other components, so that the optical glass has excellent anti-devitrification performance; the optical glass contains high-refractive-index components such as Nb2O5 and TiO2, so that the optical glass has a relatively high refractive index; through reasonable component design, the glass has low relative partial dispersion.

This invention discloses a high-elongation cast Al-Cu-Zn-Mg alloy with good resistance to hot cracking. The alloy composition, by mass percentage, includes: Cu 3.5–4.5%, Mg 0.4–1.5%, Mn 0.2–0.5%, Ti 0.10–0.2%, Zn 2.5–3.5%, with the balance being Al and unavoidable impurity elements. Addressing the limitations of existing Al-Cu casting alloys, such as wide solidification temperature range, poor fluidity, and hot cracking, this invention provides a high-Zn-content Al-Cu-Zn-Mg alloy with good resistance to hot cracking. This alloy has a low melting point, a narrowed solidification temperature range, and excellent resistance to hot cracking and mechanical properties. It can be used for various high-strength cast aluminum alloy structural parts, effectively avoiding casting defects such as hot cracking, shrinkage cavities, and porosity, and significantly improving the overall mechanical properties of the alloy.

The application discloses a method for improving signal-to-noise ratio of femtosecond transient absorption spectrum, which comprises a femtosecond transient absorption spectrometer with an inner wall having an optical absorption coating, and the femtosecond transient absorption spectrometer is further internally provided with a low-dispersion laser focusing assembly and a micro-nano reflection assembly in front of a sample table, the micro-nano reflection assembly comprises a reflection structure and a light transmission area, the reflection structure is not completely perpendicular to an incident light path, so that the light path reflected by the reflection structure can irradiate the optical absorption coating; the low-dispersion laser focusing assembly focuses supercontinuum white light and provides dispersion to the micro-nano reflection assembly, and the micro-nano reflection assembly selectively reflects according to the dispersion effect to adjust the spatial distribution of light of different wavelengths near a focal point. The application adjusts the transmission rate of the probe white light by the micro-nano reflection assembly, and does not cause the pulse width of the femtosecond pulse probe white light to be widened. Under the premise of maintaining the maximum time resolution of the femtosecond transient absorption spectrum, the signal-to-noise ratio of the femtosecond transient absorption spectrum is effectively improved.

The invention discloses a dynamic optical scanning holographic encryption system based on time-space joint imaging, which comprises a laser, a light beam emitted by the laser is divided into two light beams by a beam splitter, one transmission light beam irradiates an orbital angular momentum multiplexing hologram, and the other transmission light beam irradiates an orbital angular momentum multiplexing hologram. One beam of reflected light is transmitted to a beam combiner through a space-time coupling spring light generation module and an optical delay line module in sequence, and the other beam of reflected light is transmitted to the beam combiner through a plane mirror, an optical switch and an encryption key in sequence, so that the other beam of reflected light interferes with the time-delayed space-time coupling spring light to generate dynamic interference fringes, and the dynamic interference fringes are scanned through a Fourier transform lens and a scanner; the time-space coupling spring light generation module is used for generating time-space coupling spring light, and the optical delay line module is used for carrying out delay processing on the time-space coupling spring light and realizing accurate modulation time delay. The invention further discloses a dynamic optical scanning holographic encryption method based on time-space combined imaging.

The application provides a high beam module and a vehicle lamp. The high beam module comprises a light source for emitting light; a high beam lens arranged on the light emitting side of the light source, the high beam lens being an integral structure, the high beam lens comprising a light inlet surface, a first total reflection surface, a second total reflection surface, a third total reflection surface and a light outlet surface, the second total reflection surface and the third total reflection surface being oppositely arranged along a first direction, the light outlet surface being located on one side of the third total reflection surface along a second direction, the light emitted by the light source being projected to the first total reflection surface through the light inlet surface, the parallel light being formed after being reflected by the first total reflection surface, the parallel light being reflected by the second total reflection surface and the third total reflection surface in sequence, and the parallel light being emitted by the light outlet surface to form a high beam light pattern; the light outlet surface comprises a plurality of sub-light outlet surfaces arranged in sequence along a third direction, and the distance between the root of each sub-light outlet surface and the light source along the second direction gradually increases along the third direction. The application can improve the light efficiency of the high beam module while ensuring the narrow opening size.

The utility model relates to rainwater and garbage separation technical field, concretely is a kind of separation device of rainwater and garbage separation, including separator main body, the water inlet is arranged in the side of separator main body, the water outlet is arranged in the other side of separator main body, and the flange of the other end of water outlet is connected with drain pipe;Guide cylinder, the inner wall of separator main body is fixedly connected with guide cylinder, and the inside of guide cylinder is inserted with barrier net, the filter cylinder is inserted between barrier net and guide cylinder, and the upper fixed connection of filter cylinder has hanger. The utility model is through the setting of water outlet water inlet end rectangle structure, so that it can better realize the material guiding of rainwater, effectively avoid the residual of rainwater in separator main body, ensure rainwater fully separated material guiding, avoid the floating situation caused by garbage following overflow hole position to appear simultaneously, further improve the stability of rainwater garbage filtration, ensure that garbage is impacted and accumulated in the bottom of filter cylinder.

The present application belongs to the field of radio wave propagation theory and electromagnetic field numerical calculation technology, and discloses a low-dispersion very low frequency radio wave propagation characteristic prediction method.The present application method aims at the defects of large numerical dispersion, low calculation efficiency and high resource occupation of the existing FDTD method in long-distance, complex layered medium scene, and realizes high-precision and high-efficiency prediction of the very low frequency radio wave propagation characteristic in seawater-air-ionosphere medium by combining HIE-FDTD method and M(2,4)FDTD method through three-layer processing of the whole calculation area.The present application method solves the contradiction between reducing numerical dispersion error and reducing computer consumption of the traditional FDTD method, can greatly reduce computer memory resource occupation and improve calculation speed while ensuring prediction accuracy, is suitable for electromagnetic propagation simulation of large-size, complex medium and terrain, and has obvious advantages in phase delay prediction of very low frequency ground wave propagation.

This invention discloses a graded-index non-zero dispersion-shifted optical fiber based on orbital angular momentum modes, comprising an optical fiber body including a ring core and an optical fiber cladding surrounding the ring core. The optical fiber cladding includes a circular region inside the ring core and an outer optical fiber cladding outside the ring core. This invention aims to provide a feasible optical fiber structure for suppressing four-wave mixing to meet the requirements of low-dispersion transmission of multiple orbital angular momentum modes.

The utility model relates to optical field, concretely is a kind of traffic lens and imaging device, the traffic lens is sequentially composed of fixed lens group of positive focal power, focusing lens group of negative focal power and compensation lens group of positive focal power from object plane side to image plane side;The focusing lens group moves along the main optical axis direction of the traffic lens, for adjusting the object distance of the traffic lens;The traffic lens satisfies the following conditional formula:-4 The focal length of focusing lens group is reduced, the focal length of focusing lens group front group and rear group is optimized, the possibility of excessive volume of front group and rear group is reduced, the traffic lens has small change in resolving power, and the miniaturization of traffic lens is realized.

The invention relates to a polarization-maintaining hollow-core anti-resonance optical fiber suitable for laser transmission and broadband communication, which comprises an elliptical fiber core (1), an outermost sleeve (7) and a cladding area, and is characterized in that the elliptical fiber core (1) is filled with air; the cladding region comprises an x-direction structure and a y-direction structure, the x-direction structure comprises at least one first cladding, the y-direction structure is vertically symmetrical relative to the central axis of the x-direction structure and is divided into an upper half part and a lower half part, and each of the upper half part and the lower half part comprises at least one second cladding; the first cladding comprises a first cladding tube (2), a second nested cladding tube (3) and a third nested cladding tube (4); and the second cladding comprises an internally nested cladding tube (5) and an externally nested cladding tube (6). According to the invention, polarization and low-loss energy transmission can be realized in a 1080nm high-energy transmission wave band, and wide application prospects are realized in the aspects of communication, sensing, high-energy polarization laser transmission and the like.

This invention provides an optical glass with a low glass transition temperature, low dispersion, and excellent thermal stability. The optical glass of this invention has the following glass composition, expressed as cation percent: S 6+ Content exceeding 0.0% but below 30.0%, Al 3+ Content exceeding 0.0% but below 30.0%, P 5+ Content of 5.0% or more and 50.0% or less, Li + Content of 0.0% to 51.0% and Na + Content of 0.0% or more and 44.0% or less, K + The content is above 0.0% and below 45.0%, Li + Na + K + and Cs + Total content R + For a percentage above 5.0%, Be 2+ Mg 2+ Ca 2+ 、Sr 2+ And Ba 2+ The total content is set as R. 2+ R 2+ Compared to Al 3+ With R 2+ The total content of cation ratio (R) 2+ / (Al 3+ +R 2+ The anion content is 0.56% or less, and the glass composition is as follows (expressed as anion percentage): O 2‑ The content is above 10.0% and below 95.0%, F ‑ The content is 10.0% or more and 90.0% or less, and the external transmittance of the above optical glass at a wavelength of 500nm to 1000nm is 80% or more when converted to a thickness of 10.0mm.

The invention provides self-repairing TPU (thermoplastic polyurethane) optical resin as well as a preparation method and application thereof. According to the self-repairing TPU optical resin disclosed by the invention, dithio diethylene glycol is deliberately selected as a cross-linking agent to introduce a dynamic disulfide bond, so that a material network is endowed with dynamic reversibility; meanwhile, a thiocarbamate bond and a dynamic metal coordination bond are introduced to a polyurethane main chain, the multi-dynamic bond action mechanism breaks through the bottleneck of low self-repairing efficiency of a single dynamic bond in the past, and on the basis of ensuring the mechanical strength performance under the normal temperature condition, the material can be effectively repaired when being subjected to microscopic damage, so that the self-repairing efficiency of the material is greatly improved. And the exchange reaction of covalent hydrogen bonds and disulfide bonds can be triggered through external stimulation, so that the self-repairing of the damaged part is realized, the anti-scraping performance of the optical element is remarkably improved, and the service life is prolonged. The TPU optical resin provided by the invention has high-efficiency self-repairing performance, is recycled and regenerated, and realizes performance balance among high refractive index, low dispersion and mechanical strength.

This utility model discloses an optical lens assembly for a vehicle headlight, a vehicle headlight, and a vehicle, relating to the field of vehicle headlight technology. The optical lens assembly includes a light source, an aperture, a first lens, and a second lens. The aperture forms a light-transmitting hole facing the light source. The first lens is disposed on the side of the aperture away from the light source. The second lens is disposed between the aperture and the light source, and the surface of the second lens facing the light source is planar. At least one of the first and second lenses has an Abbe number greater than 55, and at least one of the first and second lenses has a refractive index greater than 1.80. The optical lens assembly of this utility model ensures high-quality lighting while reducing size, assembly costs, and difficulty.

The invention discloses an optical monomer and a preparation method thereof, optical resin and application, the chemical structural formula of the optical monomer is shown in the figure 1, the optical monomer has the excellent properties of high refractive index, high light transmittance, low yellowness index and the like, the preparation route is simple, the condition is mild, raw materials are easy to obtain, and industrial production is easy. The invention provides the optical resin containing the optical monomer, so that the optical resin with high refractive index, high light transmittance, low yellowness, excellent water resistance, good thermal stability and good mechanical property is obtained, the invention further provides a preparation method of the optical resin, and an optical lens, an optical element and an optical device containing the optical resin.

This invention relates to the field of defect detection technology, specifically to a method for improving the YOLOv8 network and its application in strip steel surface defect detection. Based on YOLOv8, this invention first proposes an improved coordinate attention mechanism, the three-channel coordinate attention mechanism TCCA. Addressing the overly simplistic offset mask generation method in DCNv2, which leads to insufficient deformation modeling capabilities, this invention proposes deeply embedding TCCA into DCNv2. Furthermore, this invention introduces a global attention mechanism to improve the model's ability to extract global features. The invention also introduces a BiFPN structure and dynamic serpentine convolution to enhance the model's multi-scale feature fusion capabilities. MDPioU replaces the original loss function of YOLOv8, solving the problem of loss of effectiveness due to identical aspect ratios in predicted bounding boxes, while increasing convergence speed and localization ability. Extensive comparative and ablation experiments on the NEU-DET dataset demonstrate that the improved algorithm of this invention achieves higher defect detection accuracy and faster speed.

This invention discloses a waveguide HUD angle adjustment system with dispersion compensation, relating to the field of automotive head-up display technology. It includes an image generation unit, a wedge prism, a deflection prism, an arrayed waveguide, a compensation mirror, and a windshield. The image generation unit outputs an image beam carrying image information. The arrayed waveguide includes a waveguide substrate, an input reflection slope disposed within the waveguide substrate, and multiple output reflection slopes spaced apart along the light propagation direction. This invention fixes the exit angle adjustment function on the non-parallel input and output reflection slopes, and fixes the dispersion compensation function on a single wedge prism located in the front-stage optical path. This achieves a coordinated structure of front-stage dispersion compensation, waveguide-based exit angle adjustment, output pupil expansion protection, and rear-stage aberration compensation, realizing optical path regularization and low dispersion display without increasing the overall installation tilt angle.

This utility model relates to the field of camera lenses, and more particularly to a compact camera lens, comprising: a first lens group, a second lens group, and a third lens group arranged sequentially along the light-gathering direction, with a variable aperture between the first lens group and the second lens group. The lens's length and maximum image height are characterized by the following condition: TTL / Ymax < 6; where TTL is the total length from the vertex of the first lens surface in the first lens group to the image plane, and Ymax is the paraxial maximum image height at infinity. By employing high-refractive-index optical glass and a compact lens group arrangement, the lens body length is shortened and weight reduced while maintaining a maximum aperture of F1.7, achieving true portability while ensuring image quality. An aspherical lens is used at the front end to reduce field curvature and distortion. Increasing the optical power ratio of the moving group reduces the travel of the moving group, further shortening the overall lens body length.

The invention discloses a coupling lens structure, an optical module and a manufacturing method, the coupling lens structure is composed of an optical focusing unit and an optical reflection unit, the optical focusing unit receives an optical signal transmitted by a multimode fiber and collimates or focuses the optical signal, and the optical reflection unit changes the propagation direction of the optical signal of an optical input path and reflects the optical signal to an optical output path. The light reflection unit forms a BESSEL-TIR reflection surface, and the BESSEL-TIR reflection surface modulates the propagation phase of a light signal, and enables the light spot of the light signal to be an annular light spot. According to the technical scheme, a traditional TIR plane reflecting surface is replaced by the BESSEL-TIR reflecting surface with the quasi-axial conical surface structure, on the premise that the overall structure and the manufacturing process of an original optical module are not changed, phase modulation of incident Gaussian beams is achieved, light spots can be effectively shaped to be annularly distributed, the annular flux control performance of optical signals is remarkably optimized, and the optical module can be applied to the field of optical modules. High-order mode excitation in the multimode optical fiber is reduced, dispersion and pulse broadening phenomena are further reduced, and therefore the transmission rate and the transmission distance of the optical module are improved.