6results about How to "Low dispersion" patented technology

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 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.

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.

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.