8results about How to "Reduce diffraction effects" patented technology

The utility model discloses a cutter wear detector which is characterized in that the cutter wear detector comprises a shell, and the shell is provided with a blue laser emitting port and a blue laser receiving port; a blue laser transmitter, a blue laser receiver, a detector control unit and a built-in battery are arranged in the shell, and a blue laser diode is arranged in the blue laser transmitter; and the detector control unit is connected with the blue laser transmitter and the blue laser receiver. The beneficial effects of the utility model lie in that the detection dimension precision and the detection speed are improved, the time cost is reduced, and the product quality is improved; the tool wear detection efficiency is improved, meanwhile, the labor cost is reduced, and product scrapping and collision caused by manual tool setting errors are avoided.

The invention provides a rainbow pattern elimination AR display device based on an angle correlation filtering film, and relates to the field of augmented reality display. The device comprises a micro display, an optical waveguide structure lens and angle correlation filtering films on the surfaces of the two sides of the lens. The angle correlation filtering film sequentially comprises a second protection layer, a second grating layer and a substrate layer; the second grating layer is composed of light-transmitting units and light-shading units in an alternating mode. The shading unit adopts an asymmetric structure, and the asymmetric angle response of the angle correlation filtering film is matched with the lens coupling-out grating; and the second grating layer adopts a special arrangement mode to inhibit the diffraction effect. According to the augmented reality display device, large-angle external environment light is prevented from entering the grating area through the angle correlation filtering film, so that rainbow lines of the augmented reality display device are eliminated, the augmented reality display device has the advantages of being insensitive to wavelength and polarization and light and thin, diffraction artifacts cannot be additionally introduced, and the imaging quality and user experience of the augmented reality display device can be improved.

The invention discloses an improved method for underwater optical signal detection, and belongs to the technical field of optical communication. The method comprises the following steps: taking a Bessel-Gaussian beam as a carrier beam, acquiring temperature and salinity values of a communication water area through a sensor, and then calculating a long-term expansion radius of the carrier beam transmitted to a receiving end under the temperature and salinity conditions of the water area and a focal spot radius of the carrier beam on a focal plane after passing through a focusing lens; on the basis, the suggested value ranges of the aperture and the focal length of the focusing lens are determined, so that the carrier light beam can be completely received by the focusing lens and is completely coupled into the detector; and finally, a detector is arranged at the focal plane of the selected focusing lens, so that the detection of the carrier light beam is realized. According to the invention, for the adverse effect of water area temperature and salinity changes on carrier light beam detection, appropriate focusing lens parameters are selected for compensation, and the adaptability of an underwater wireless optical communication system to different water area environments is improved.

The application provides a light-emitting chip and a laser light source. The light-emitting chip comprises a substrate, an N electrode, an N-type Bragg mirror set, an active layer, a current blocking layer, a P-type Bragg mirror set and a P electrode. The current blocking layer is formed on the active layer, and a current injection aperture is formed in a central region of the current blocking layer. The P-type Bragg mirror set is formed on the current blocking layer, and the projection of the P-type Bragg mirror set on the active layer is larger than the current injection aperture along the injection direction of the current. The P electrode is formed on the P-type Bragg mirror set. A PN junction depletion region is formed at the junction of the current blocking layer and the P-type Bragg mirror set. The PN junction depletion region is used to prevent the current from flowing into the current blocking layer, so that the current is injected into the active layer through the current injection aperture, thereby improving the injection efficiency of the current in the active layer, and more electrons and holes can be combined in the active layer, thereby improving the electro-optical conversion rate and the light-emitting quality of the light-emitting chip.

This invention discloses an optimization device and method for laser spot edge diffraction, relating to the field of optical instrument technology. The optimization device includes two sets of guiding mechanisms, two sets of driving mechanisms, and two sets of aperture pairs. Each aperture pair includes two opposing aperture plates, the edges of which are used to define the light transmission boundary and have a serrated structure. The driving mechanisms drive the two aperture plates in the same set to move synchronously in opposite directions along the guiding direction. The positions of the two aperture pairs are independently controlled to combine and form different light transmission boundaries. In the optimization method, the positions of the two aperture pairs are adjusted according to the edge morphology of the laser beam to be optimized, and the laser beam is made to pass through the target light transmission boundary for edge intensity modulation. Through the technical solution of this invention, the edge diffraction caused by traditional straight-edge apertures is reduced, and the edge smoothness of the laser beam, the flexibility of light transmission boundary adjustment, the adaptability to different spot morphologies, the shaping consistency, and the processing stability are improved.

There is provided a light measuring apparatus including: a first lens; a first variable opening positioned at a predetermined distance in the first direction from the first lens; a second lens positioned at a predetermined distance in the first direction from the first variable opening; a second variable opening positioned in the first direction from the second lens; a third lens positioned in the first direction from the second variable opening; and a light receiving unit positioned at a predetermined distance in the first direction from the third lens, in which a diameter of the first variable opening and a diameter of the second variable opening are independently adjusted. The light measuring device is capable of improving image quality.

The utility model belongs to the technical field of beam limiting devices, and particularly relates to a shielding assembly for a speed limiter and an adjustable shielding device. The fixed lead window comprises a fixed bracket and a rounded rectangular lead window, and a rectangular opening is formed in the lead window; the aperture adjusting part comprises a base and a pressing ring, an annular groove is formed in the base, a rotatable rotating disc is arranged in the annular groove, the pressing ring is used for abutting the rotating disc into the annular groove, a plurality of radial sliding grooves are formed in the rotating disc, and a plurality of shielding blades stacked layer by layer are arranged between the rotating disc and the base. The upper ends and the lower ends of the shielding blades are hinged to the rotating disc and the base through upper pin shafts and lower pin shafts respectively, the upper pin shafts are slidably installed in the radial sliding grooves, the rotating disc is rotated so that the upper pin shafts can slide in the radial sliding grooves in the direction close to or away from the center of the rotating disc, and the upper ends of the shielding blades are driven to be close to or away from each other. The shielding range of the shielding blade is adjusted; the shielding efficiency, the shielding utilization rate and the imaging quality of the beam limiting device are improved.

The invention discloses a spliced holographic film and a manufacturing method thereof. The spliced holographic film comprises a base material; the holographic information layer is located on the base material and comprises a splicing unit array, and splicing units in the splicing unit array are arranged in a staggered mode. The manufacturing cost of the holographic film can be reduced, and meanwhile the rainbow fringe phenomenon can be restrained.