43results about How to "Solve dispersion" patented technology

The invention discloses a head mounted type display device based on holographic waveguide. The head mounted type display device comprises inlet coupling grating (1), left visual field deflection grating (2), right visual field deflection grating (3), outlet coupling grating (4), and rectangular waveguide (5). The inlet coupling grating (1), the left visual field deflection grating (2), the right visual field deflection grating (3), and the outlet coupling grating (4) are attached to the upper surface or the lower surface of the rectangular waveguide (5). Whether the inlet coupling grating (1), the left visual field deflection grating (2), the right visual field deflection grating (3), the outlet coupling grating (4), and the rectangular waveguide (5) are attached to the upper surface or the lower surface is determined by an exit entrance pupil light design direction. By adopting a pupil remodeling way, a visual field separation problem of a conventional two-dimensional pupil dilation way under a large visual field angle condition is solved.

The invention discloses a water quality detection device which comprises a base, a cam motor, a cam, a water material sliding table, a fixed support, a stirrer, a stirring motor, a stirring lifting table, an air cylinder, a screw motor, a water material container, a detection sliding table, an anti-dispersion cover, a result display, a detection liquid container, a lamp source, a color sensor anda detection liquid dropper. The fixed support is fixedly installed on the base, a water material sliding table guide rod base is fixedly installed on the base, and the detection sliding table base isfixedly connected with the water material sliding table guide rod base and the fixed support. The water quality condition is detected through different liquid reagents; corresponding liquid reagents are selected according to different attributes of water quality to be detected; color change after reaction of the water material and the reagent is distinguished through the lamp source and the colorsensor, a processor receives color signals and then performs distinguishing analysis according to chromatography, and a result is displayed on the result display, so that whether the water quality isgood or not is determined, a detection result is accurate, and manual judgment capacity is not needed.

The invention relates to a method for performing focusing shaping control on a distorted femtosecond laser pulse. The method is characterized in that an optical inverse diffusion algorithm is writtenaccording to a time inversion principle; a phase shift holographic algorithm is written according to a holographic interference principle; light beams output from a laser 1 are incident on a beam splitter 2 and are divided into two parts, one part entering a sample light path 3.1-8 and the other part entering a reference light path 3.2-8. The light beams in the reference light path 3.2-8 are reflected onto an isosceles prism 10 by a second mirror 3.2 and a third mirror 3.3, the light beams are reflected to a fourth mirror 3.4 by the isosceles prism 10, and the light beams are reflected by thefourth mirror 3.4 and then input to a two-dimensional spectrometer 8. According to the method in the invention, the spatial freedom of the wave-front in a spatial light modulator is controlled by running the optical inverse diffusion algorithm through a computer, thereby realizing simultaneous focusing shaping control on the spatial distortion and time distortion of the femtosecond laser pulse.

The method includes following steps: (1) based on need of beam-splitting number, selecting a piece of Daman grating to split laser pulse in femtosecond in order to guarantee vertical incidence of light beam; split diffracted beam in m order of diffraction passing through a compensation grating, whose space cycle is 1/m of space cycle of Daman grating, arranged in parallel in order to eliminate difference of different diffraction angle of each components of frequency spectrum at the order of diffraction; (2) vertical distance between compensation grating and Daman grating is ensured to separate light beams in each order of diffraction thoroughly; (3) repeating step (2) in order to compensate all diffracted beams split. The method eliminates angular dispersion of each light beam split. Thus, pulse width and shape of light beam are kept in about 100fs range.

The invention discloses an implementation method of a full-color volume holographic anti-counterfeiting technology based on DMD. The method employs an optical path system, an image generation system and a volume holographic material, and the method comprises the following steps: generating two coherent light beams through an optical path system; and recording a three-dimensional image generated by the image generation system on the volume holographic material through two coherent light beams. According to the invention, the computing holography and the volume holography are combined, so a three-dimensional object which does not exist can be simulated to the DMD through computer holography, and then is recorded on a volume holographic material by adopting an interference method; a volume hologram is generated through three-color laser multiplexing interference, and the generated volume hologram has a wide diffraction band has similar diffraction efficiency for different wavelengths, so that the dispersion problem of volume holography is effectively solved, a more obvious full-color true three-dimensional dynamic effect is realized. Compared with that of the traditional holographic anti-counterfeiting technology, the anti-counterfeiting effect is enhanced. Meanwhile, the imitation difficulty is increased due to the unduplicateability of the volume holographic material.

Leak of a metered resin by backflow in injection filling is prevented not depending on reverse rotation of a screw but by closing a ring valve by controlling a screw forward movement speed in injection filling. An injection filling speed and a valve closing operation speed are set to the screw forward movement speed. The valve closing operation speed is different from an initial speed of the injection filling speed, and the operation time thereof is set to the time necessary for moving the injection screw by a distance capable of performing the valve closing after the end of metering. The valve closing is performed with the set operation speed and the set operation time.

The invention provides radio over fiber communication technology with high linearity and dispersion resistance. The technology comprises the following steps: incident light carriers are evenly divided into two paths on a mother modulator of double parallel strength modulators to be transmitted on upper and lower arms of the mother modulator. The light carriers transmitted on the upper arm are modulated by radio frequency signals when passing by a sun strength modulator 1. The amplitudes of the radio frequency signals loaded on two electrodes of the sun strength modulator 1 are the same, the phase angles are respectively 102.27 degrees and 180 degrees, a certain bias voltage is loaded, so that the light signals transmitted on the upper arm of the sun strength modulator 1 deviates for 102.27 degrees relative to the lower arm. In addition, when the light carriers transmitted on the lower arm of the mother strength modulator pass by the sun strength modulator 2, no signal or bias voltage needs to be loaded, but a bias voltage needs to be loaded to the lower arm of the mother strength modulator, so that the light carriers transmitted on the lower arm shift for 245.26 degrees relative to the incident light carriers. Finally, the light signals modulated by the mother modulator are transmitted by an optical fiber and are detected. Therefore, the system has the properties of high linearity and dispersion resistance.

The invention provides an augmented reality display device and head-mounted equipment. The augmented reality display device comprises an optical machine and an optical waveguide. The optical waveguide comprises an optical waveguide sheet and two metasurface gratings; each of the two metasurface gratings comprises two strip-shaped units with the same height and different widths, the two strip-shaped units are arranged in parallel at a first distance to form a basic unit, and the basic units are periodically arranged at a second distance; the strip-shaped units in the two metasurface gratings are symmetrically arranged; under the condition that the height of the strip-shaped unit is larger than or equal to one third of the minimum wavelength of a light beam emitted by an optical machine, the light beam enters the first metasurface grating to deflect and generate a phase difference in direct proportion to the height of the strip-shaped unit, enters the optical waveguide sheet to deflect again and generate total reflection, and is emitted out of the second metasurface grating to be imaged in human eyes. According to the invention, the two metasurface gratings adopt a symmetrical structure, so that the light efficiency of different wavelengths and incident angles can be complementary, and the brightness of an image after pupil expansion is uniform.

The invention provides a multi-gap liquid crystal display panel and a manufacturing method thereof. The manufacturing method comprises the following steps: providing a first substrate which is provided with a first pixel area, a second pixel area and a third pixel area; orderly forming a first dielectric layer and a second dielectric layer which are covered on the first pixel area, the second pixel area and the third pixel area; removing the second dielectric layer which is positioned on the second pixel area and the third pixel area; removing the first dielectric layer which is positioned on the third pixel area; assembling a second substrate on the first substrate so as to form a first gap, a second gap and a third gap on the first pixel area, the second pixel area and the third pixel area between the first substrate and the second substrate respectively; and filling a liquid crystal layer between the first substrate and the second substrate. Different unit cell gaps are produced in the pixel areas with different colors, so that the penetration rates of different color light tend to be consistent so as to solve the problem of chromatic dispersion.

The invention provides an optical waveguide with two metasurface gratings and a head-mounted device. The optical waveguide comprises an optical waveguide sheet, a first metasurface grating and a second metasurface grating, the first metasurface grating comprises three strip-shaped units with the same height and width; the three strip-shaped units are arranged in parallel at a first distance to form basic units, and the basic units are periodically arranged on the surface of the optical waveguide sheet at a second distance; when the height of each strip-shaped unit is larger than or equal to one third of the minimum wavelength of a light beam emitted by an optical machine, the light beam enters the first metasurface grating to be deflected for the first time, generates a phase difference in direct proportion to the height of the strip-shaped unit, enters the optical waveguide sheet to be deflected for the second time towards the two sides and is totally reflected; the light beams are emitted to the human eyes from the two second metasurface gratings to be imaged, and the second metasurface gratings only conduct one-way deflection on the light beams. Bidirectional pupil expansion can be realized towards two sides through the first metasurface grating, and the utilization rate of the optical waveguide is improved.

The invention discloses a W-band high-gain zero-dispersion glass-based microstrip array antenna, and belongs to the technical field of antennas. The W-band high-gain zero-dispersion glass-based microstrip array antenna sequentially comprises a radiation patch layer, a glass substrate and a reflecting plate layer from top to bottom, and the radiation patch layer comprises 16 series-fed microstrip patch subarrays and a set of hybrid feed network; each series-fed microstrip patch subarray comprises at least two radiation patches, the interval between the adjacent patches is 1 lambda g, and lambda g is the wavelength of a center frequency guide wave; the hybrid feed network comprises a one-to-eight unequal power divider 2 and eight one-to-two equal power dividers 3; and the spacing of each branch port in the one-to-eight unequal power divider is an integer multiple of the spacing of the wavelength of the guide wave. The antenna can improve the limitations of large feeder network loss, chromatic dispersion of beam pointing and the like of the current common microstrip array antenna, and is suitable for a high-precision real-time imaging system.

The invention relates to a light guide assembly. The light guide assembly comprises a light guide sheet and a light diffusion sheet; the light guide sheet is arranged at one end of the light diffusion sheet and is fixedly connected with the light diffusion sheet; and a first reflecting layer is arranged on the upper end surface of the light guide sheet. Compared with the prior art, the light scattering sheet is used for scattering the light irradiated by the light guide sheet and the light reflected by the light guide sheet, so that the light is uniformly emitted from the surface of the light scattering sheet.