6 results about "Angle dependence" patented technology

The invention relates to the technical field of dental image shooting, and discloses a label-based intelligent positioning method and device, a positioner and a ray machine, and the method comprises the steps: collecting response signals of a plurality of induction labels of an imaging sensor aiming at a signal transmitted by a label positioner arranged on the ray machine, and receiving signal intensity and carrier phase information; the method comprises the following steps: estimating an estimated distance for any induction tag by fusing a linear relationship between an attenuation model of received signal strength and a carrier phase, and eliminating a single tag error by utilizing multi-point sampling in combination with the estimated distance and position information of all the induction tags and a position offset generated by a positioning imaging sensor relative to a ray machine, so as to realize submillimeter-level accurate positioning. The alignment accuracy and efficiency of the two are improved, so that the position is accurate when the dental X image is shot, and the imaging sensor is ensured to completely fall into the range of the projection area; the device is flexible in installation, low in cost, small in angle dependence, and suitable for low-power-consumption scenes where the size of the sensor in the oral cavity is limited and no independent power supply exists.

This invention discloses a method for evaluating the angle dependence of critical current in superconducting tapes, relating to the field of superconducting tape performance evaluation technology. The method includes: measuring the critical current values ​​of the superconducting tape at multiple magnetic field angles under constant environmental conditions; calculating the statistical average of the critical current values ​​and a quantitative index characterizing the dispersion of the data; and evaluating the angle dependence of the critical current of the superconducting tape based on the magnitude of the quantitative index. This method enables a quantitative comparison of the angle dependence of critical current in different superconducting tapes, is simple to calculate, has good versatility, and is suitable for superconducting tape design and material selection evaluation.

A polarizing plate includes a polarizer and an optical film configured to suppress in-plane tint unevenness and azimuthal angle dependence when a display device is viewed obliquely in a black display state. The optical film has an in-plane retardation of 130 to 150 nm at a wavelength of 550 nm and includes, from a polarizer side, a first optically anisotropic layer, an intimate attachment layer, and a second optically anisotropic layer. The first optically anisotropic layer has an in-plane retardation of 150 to 240 nm at 550 nm, and a ratio of the in-plane retardation to a thickness of the first optically anisotropic layer is 0.07 to 0.116.

The embodiment of the invention provides a method for improving light guide-out uniformity of a diffracted optical waveguide and the diffracted optical waveguide, and the method comprises the steps: determining a first polar angle of light in a first pupil expansion direction and a second polar angle of light in a second pupil expansion direction in a two-dimensional diffracted micro-nano structure according to a horizontal deflection angle and a vertical deflection angle of incident light relative to a normal of the diffracted optical waveguide; based on the first polar angle and the second polar angle, a first target polar angle corresponding to the first polar angle and a second target polar angle corresponding to the second polar angle are determined, and the diffraction micro-nano structure region is determined based on the first target polar angle, the second target polar angle, the horizontal deflection angle, the vertical deflection angle and the period coupled into the diffraction micro-nano structure region. And periodically modulating the two-dimensional diffraction micro-nano structure to a corresponding first target period in the first pupil expansion direction and the second pupil expansion direction, so that the order of the diffraction light meets the polar angle symmetry. The problem that the light intensity distribution of the exit pupil area is not uniform due to the view angle dependence of the grating diffraction efficiency, and then the image brightness uniformity is reduced is solved, and the light emitting uniformity and the display effect are improved.

The invention discloses a multi-angle adjustment ion beam impurity sputtering experiment device and method based on magnetic driving. The multi-angle adjustment ion beam impurity sputtering experiment device comprises a vacuum cavity, a sample table assembly, a magnetic control angle isocentric adjustment mechanism and a multi-layer magnetic shielding mechanism. By adjusting the magnetic field direction and strength of an electromagnet in the magnetic driving angle isocentric adjusting mechanism, 0-90-degree non-contact angle adjustment of a sample in a vacuum environment is realized, and the vacuum sealing problem caused by a traditional shaft penetrating type transmission structure is avoided. The multilayer magnetic shielding mechanism can effectively inhibit interference of magnetic field leakage to ion beam transmission and sputtering processes. Due to the isocentric adjustment design, the sputtering point position of the sample is kept fixed in the rotating process, and the problems of ion flux deviation and sputtering point drift caused by incident angle change are solved. The device is compact in structure, reliable in sealing, small in magnetic interference and suitable for multi-angle impurity sputtering, incident angle dependence research and surface deposition experiments.

The application provides a force-induced color change film with low angle dependence and fatigue resistance and a preparation method and application thereof, and the force-induced color change film is prepared by the following steps: preparing a silica amorphous photonic crystal film through a sol-gel method, KH570 modification and a pulling method; and uniformly coating PDMS solution on both sides of the film to obtain the force-induced color change film with low angle dependence and fatigue resistance. The nano-silica photonic crystal has uniform particle size and good dispersibility in ethanol, so that the periodic and regular arranged amorphous photonic crystal film can be prepared through the pulling method, and the film has low angle dependence when observed at different angles under indoor diffuse light; through modification, carbon-carbon double bonds are grafted on the surface of the silica nanoparticles, the carbon-carbon double bonds react with hydroxyl groups and mercapto groups on the surface of PDMS, chemical bonds are introduced, the interface interaction between the inorganic silica nanoparticles and the PDMS is enhanced, and therefore the mechanical properties and fatigue resistance of the material are improved.