23 results about "Exit angle" patented technology

The present invention relates to a reading and writing table device with peripheral defocus and unobstructed vision, which includes a housing, a beam splitter, an eyepiece, and an object distance adjustment panel. The housing is a closed frame structure with an open front sidewall. The eyepiece is embedded on the rear sidewall of the housing. The eyepiece includes a concave mirror and a retroreflective lens tightly surrounding the periphery of the concave mirror. A beam splitter is inclinedly arranged in the housing between the open part of the housing and the eyepiece. The object distance adjustment panel is embedded on the lower sidewall of the housing, and the size of the object distance adjustment panel is adapted to the size of the retroreflective lens, so that the middle area of the picture seen by the human eye through the reading and writing table device is a virtual image, and the peripheral area is a real image, which can achieve the effect of preventing and controlling myopia. The included angle between the sidewall of the housing and the eyepiece satisfies a certain relational expression, so that the included angle between the sidewall of the housing and the eyepiece can be determined according to the exit angle of the marginal light rays, so as to achieve the viewing effect that the vision is not blocked by the housing, and improve the use experience and visual effect.

The invention provides a polymorphic beam controller and a preparation method thereof. The preparation method comprises the following steps: constructing a modulation unit structure based on a phase change material; constructing a metasurface radius-phase distribution library based on the modulation unit structure; screening a metasurface from the metasurface radius-phase distribution library according to a preset incident angle and a preset deflection angle of the polymorphic beam controller; and manufacturing the polymorphic beam controller based on the screening result. According to the invention, the metasurface radius-phase distribution library is constructed, and the appropriate metasurface size is selected according to the required incident angle and deflection angle, so that the polymorphic beam controller under the specific incident angle and emergent angle is constructed.

There is provided an optical system and an image display device which can improve a usage efficiency of an image light ray from a display element. A light guide (5) of an optical system includes an exit extension region (53) including a diffraction structure dividing an image light ray (L1B) entering a body (50) via an incident region (51) and propagating in a first propagation direction intersecting a thickness direction of the body (50), into a plurality of image light rays (L1C) propagating in a second propagation direction intersecting the first propagation direction, in the first propagation direction, and allowing them to emerge from the light guide (5). At least one part of the exit extension region (53) satisfies that when refractive indices of media on individual incident and exit sides of an image light ray relative to the exit extension region (53) are assumed to be equal to each other, an exit angle θ_out of an image light ray (L1C) emerging from the exit extension region (53) at the highest diffraction efficiency in a predetermined plane (P1) including a normal line (N) of the exit extension region (53) is equal to or greater than 15° and is equal to or smaller than 45°, and an incident angle θ_in of an image light ray (L1B) incident on the exit extension region (53) in the predetermined plane (P1) is greater than the exit angle θ_out by 14° or more.

A lidar, a mobile system and a laser detection method. The lidar comprises: a rotating platform (10), at least two transceiver modules (11) fixed on the rotating platform (10), and a driving module configured to drive the rotating platform (10) to rotate about an axis of rotation (L) as a center, wherein each transceiver module (11) comprises a transmitting assembly configured to emit at least two laser beams having different exit angles, and a receiving assembly configured to receive echo signals of the emitted laser beams that are reflected by an object; the at least two transceiver modules (11) are arranged around the axis of rotation (L); the field-of-view ranges of at least two detection modules in a direction perpendicular to the axis of rotation (L) are staggered; and at least two annular field-of-view ranges respectively formed by the at least two transceiver modules (11) during rotation are stitched to form a larger annular field-of-view range. The lidar is low in terms of costs and can flexibly form different field-of-view ranges.

This invention discloses a high-precision white light adjustable aperture device for various operating conditions. It is characterized by comprising two absorber assemblies, each with an absorber assembly attitude adjustment mechanism, a two-dimensional precision displacement system, and a two-dimensional precision displacement system adjustment mechanism located below it. The upstream and downstream absorber assemblies are used to receive synchrotron radiation and adjust its exit angle. The two-dimensional precision displacement system adjustment mechanism is used to adjust the attitude and height of the two-dimensional precision displacement system. The two-dimensional precision displacement system is used to control the horizontal and vertical displacement of the absorber assembly. The absorber assembly attitude adjustment mechanism is used to adjust the attitude of the absorber assembly. This invention can simultaneously receive multiple types of synchrotron radiation, achieving the function of using a single adjustable aperture device to handle multiple different operating conditions within the limited space of the front-end area.

The present invention relates to a dual-scale measuring device and a measuring method for measuring the viewing angle of an optical element, including a support frame, a large scale, a small scale, a vernier disc, a vernier and a stage. The vernier is mounted on the vernier disc and abuts against the large scale, and the stage is located directly above the center of the vernier disc; the large scale and the vernier disc can rotate relative to each other, and a first locking device is provided between the small scale and the large scale or the vernier disc; when the first locking device is locked, rotating the small scale can drive the large scale or the vernier disc to rotate synchronously, and the rotation refers to a rotational movement centered on the axis of the large scale under the action of an external force. This application is mainly used to measure the exit angle of the exit light of an optical element when it is incident by a symmetric light source, and calculate the size of the viewing angle based on this; it can be used to measure the effective viewing angle of a single optical element or an optical element group, evaluate the optical element or system through this important parameter of the viewing angle, and provide guidance and reference for the application field of the optical element.

A detection device (10), a UAV, a control method and device of the detection device (10). A light pulse sequence emitted by a light source (111) in the detection device (10) passes through a scanning module (12) and can change its propagation direction by an optical module (121, 122) in the scanning module (12), wherein the optical module (121, 122) moves under the drive of a drive module, and the optical module (121, 122) changes the direction of the light pulse sequence, so that the light pulse sequence is emitted from at least two different exit angle ranges, thereby forming at least two different scanning fields of view, and the light pulse sequence of different scanning fields of view can return to a detector in the detection device (10) after being reflected by an external object, and the detector detects the at least two scanning fields of view through the received light pulse sequence. The light pulse sequence emitted by the light source (111) is divided into at least two light pulse sequences by the optical module (121, 122), and then emitted from different exit angle ranges, thereby forming at least two different scanning fields of view, so that the field of view angle of the scanning field of view of the detection device (10) can be increased.

The invention relates to the technical field of 3D (three-dimensional) sensors, and discloses a high-precision high-magnification imaging method for a 3D line laser sensor, which comprises the following steps: a light ray enters a first lens with a narrow-band coating film, and the light ray with non-405nm wavelength is filtered and then enters a second lens, so that the light ray is gathered; the gathered light enters the third lens to reduce the distortion of the light, and then sequentially enters the fourth lens, the diaphragm and the fifth lens to optimize the incident angle of the light; light emitted from the fifth lens enters the sixth lens, spherical aberration caused by the first lens, the second lens, the third lens, the fourth lens and the fifth lens is effectively compensated through the sixth lens, the light is deflected, and the angle when the light is emitted is reduced; the light emitted from the sixth lens sequentially enters the seventh lens and the eighth lens to deflect the light angle; light emitted from the eighth lens sequentially enters the first reflective mirror and the second reflective mirror, so that the total length of the high-precision and high-magnification imaging lens is shortened, and the light receiving efficiency is improved by controlling the angle at which the light enters the CMOS.

The present application relates to the field of laser radar technology, and discloses a method, device, laser radar and medium for determining the placement position of a wedge mirror. The method comprises: when performing a coarse iteration, adjusting the deflection angle combination according to a first preset adjustment step rule until the emission angle is within the preset emission angle range, and the difference between the first deflection angle and each second deflection angle is within the preset deviation range, then performing a fine iteration; when performing a fine iteration, adjusting the deflection angle combination according to a second preset adjustment step rule until each emission angle is equal to the target angle, and the first deflection angle and each second deflection angle are equal, then the iteration is completed; the first deflection angle and the second deflection angle in the deflection angle combination when the iteration is completed are used as the setting angle of the wedge mirror. The setting angle of the wedge mirror obtained in the present application can make the light beam passing through the wedge mirror swing while not causing the light beam to diverge.

The application discloses a signal transmitting and receiving method and device based on a reconfigurable refractive metasurface, the method comprising: sending a first pilot sequence to a user, and feeding back the received signal by the user; receiving the feedback of the first pilot sequence by the user, and estimating the channel between the feed source and the reconfigurable refractive metasurface, the channel between the reconfigurable refractive metasurface and the user, the incident angle of the feed source to each unit of the reconfigurable refractive metasurface, and the exit angle of each unit of the reconfigurable refractive metasurface to the user based on the feedback; designing the state of each unit of the reconfigurable refractive metasurface in the data transmitting and receiving stage according to the channel, the exit angle and the incident angle; and transmitting and receiving data based on the designed state of the reconfigurable refractive metasurface. The application can accurately estimate the response of the RRS unit, thereby improving the performance of the RRS antenna beam forming, and improving the system data transmission rate.

Optoelectronic arrangement (1) with - at least two semiconductor laser devices (10) configured to emit electromagnetic radiation, and - an optical superposition element (20) with at least one radiation entry surface (20A) and one radiation exit surface (20B), wherein - each semiconductor laser component (10) is assigned an optical component (30), - each semiconductor laser device (10) emits a plurality of spatially separated entry beams (R1), - all incoming beams (R1) of a semiconductor laser device (10) pass through the respective associated optical element (30), wherein several incoming beams (R1) emitted by a semiconductor laser device (10) are fanned out against each other after passing through the optical element (30) in such a way that the incoming beams (R1) enter the optical superposition element (20) at different angles of incidence (α), and - Entrance beams (R1) from different semiconductor laser devices (10) exit at the radiation exit surface (20B) of the optical superposition element (20) superimposed in a plurality of exit beams (R2), wherein - the optical elements (30) have a distance (D) from the optical superposition element (20), - the distance (D) of each optical element (30) is set such that the entrance beams (R1) from different semiconductor laser elements (10) exit together in common exit beams (R2) at the radiation exit surface (20B) of the optical superposition element (20). - the exit beams (R2) superimposed at a common point leave the optical superposition element (20) at a common exit angle (β), - each semiconductor laser device (10) comprises a plurality of waveguides (101) each emitting an entrance beam (R1), and - the waveguides (110) of a semiconductor laser device (10) can be controlled independently of each other.

The present invention relates to the field of optical lenses, and provides a visible near-infrared spectrum imaging lens for visible near-infrared spectrum imaging. The lens includes, from the object plane to the image plane, a first lens, a second lens, a third lens, a fourth lens, an aperture, a fifth lens, a sixth lens, a seventh lens, an eighth lens, and an integrated filter; the side of the fourth lens close to the image plane is an aspherical surface, the side of the sixth lens close to the image plane is an aspherical surface, the first lens, the second lens, the third lens, the fifth lens, the seventh lens, and the eighth lens are spherical lenses; the first lens, the fourth lens, the fifth lens, the sixth lens, and the eighth lens are positive lenses, and the second lens, the third lens, and the seventh lens are negative lenses. The present invention is used to solve the defects of the imaging lens for visible near-infrared spectrum in the prior art, such as complex structure, poor imaging quality, and small field of view. The scheme of the present invention can form an image-side telecentric optical path by setting the aperture in the center of the optical path to control the light beam exit angle, thereby improving the quality of spectral imaging.

The application discloses a laser radar beam scanning system based on a combination of a super lens and a refractive lens, which comprises laser radars, refractive lenses and super lenses arranged at intervals; scanning beams with different exit angles of the laser radars are focused by the refractive lenses and then deflected by the super lenses; wherein the super lens has a nano structure layer composed of a nano structure array, and the deflection angles of all scanning angles are equal to a target deflection angle through weighting optimization of the deflection angle and the divergence angle. The nano structure layer can realize large-angle deflection of the scanning beams, is not sensitive to the polarization angle, solves the problem that the existing laser radar beam scanning system cannot simultaneously realize large scanning angle, small system volume, high scanning speed, high resolution and long detection distance, is favorable for realizing high-performance beam scanning effect and can meet the beam processing of various scanning angles.

This invention belongs to the field of micro-nano photonics technology and discloses a metasurface and its design method, as well as a holographic imaging method. The invention first constructs the basic structure of the metasurface, including a substrate layer, a waveguide layer, and a structural layer. The substrate layer and waveguide layer are divided into unit cells of uniform size, and the structural layer includes several nanobricks, with one nanobrick disposed on the working surface of each unit cell. Using the directions parallel to the two edges of the working surface of the unit cell as the x-axis and y-axis, the displacement of each nanobrick within its unit cell along the x-axis and y-axis is determined based on the phase modulation values ​​corresponding to multiple two-dimensional diffraction orders. After incident light is incident on the metasurface provided by this invention, a camera captures multi-order holographic images; wherein, different holographic images are captured at different exit angles under different second-order diffraction orders. This invention can broaden the encoding capacity and expand the field of view under relaxed processing conditions.

The invention discloses a nondestructive testing method for through-type screw dislocation defects of a silicon carbide material, and belongs to the technical field of silicon carbide dislocation defect characterization. The nondestructive testing method provided by the invention comprises the following steps: carrying out first diffraction geometric selection based on an X-ray morphology testing system, n being a multiple of 4; an incident angle theta S, an emergent angle theta D and a sample rotation angle phi are calculated, and then parameter optimization is carried out by using rocking curve scanning and curvature calibration; performing imaging based on the optimized parameters to obtain an XRT image of the TSD; and performing dislocation automatic identification on the XRT image to obtain dislocation information of the TSD. The method provided by the invention can realize nondestructive detection of TSD defects in the silicon carbide material, has the advantages of high detection accuracy, low detection cost and simple sample preparation, and can effectively distinguish TpSD and TMD in TSD.

The present application relates to the technical field of animal repelling, and particularly relates to a bird repelling device, a control method, a terminal and a storage medium. The bird repelling device embodiment of the present application is provided with a focusing module, different sunlight irradiation angles are adjusted to be uniform exit angles, sunlight is collected, and a light beam is formed. Therefore, the obtained light intensity is high, the irradiation intensity can be significantly improved, and the irradiation spot is large, so that the locking of the repelling target is easily realized. The bird repelling control method disclosed in the present application embodiment is used for identifying and positioning the position in the image by dividing the image into image blocks through images with different visual angles, and positioning the position of the repelling target through the positions in multiple images. Therefore, the positioning precision is high, the sunlight irradiation when the attitude of the reflector is controlled is targeted, and the repelling effect is significant.

The invention belongs to the technical field of optical diffusion devices, provides a variable diffusion angle diffusion sheet based on refractive index regulation and control and a preparation method thereof, and is widely applied to an illumination system, a three-dimensional measurement system, light field regulation and control, a backlight module and a display and imaging system. A transparent optical adhesive layer with a controllable refractive index is tightly attached to a scattering surface of a traditional rough surface type diffusion sheet (such as ground glass, sand blasting glass and the like), and refraction paths of light rays between the scattering surface and the adhesive layer and between the adhesive layer and an air interface can be effectively changed by changing the refractive index of the adhesive layer, so that regulation and control of overall emergent angle distribution are realized; on one hand, the angle-variable diffusion sheet has the advantages of being simple in structure, low in cost, simple in process, high in stability and the like; on the other hand, compared with an existing adjustable diffusion technology depending on an electric control liquid crystal or a complex variable structure lens, the key problems of high cost, high manufacturing difficulty, limited optical power tolerance and the like are effectively solved.

The invention discloses a scene microwave radiance measurement method based on an inverted image, and the method comprises the steps: placing an observation target on a flat surface, receiving microwaves which are emitted at the same emission angle # imgabs0 #, come from the observation target and are reflected by cold air through the observation target through a microwave radiometer, and obtaining a first output voltage; the observation target is placed on a flat surface, the microwave radiometer receives microwaves which are emitted at the same emergence angle # imgabs1 #, come from the observation target, are reflected by the observation target after cold air is reflected by the reference wall and are reflected by the reference wall through the observation target, and second output voltage is obtained; the microwave radiometer receives the microwaves which are reflected by the reference wall and are emitted by the cold air at the emitting angle # imgabs2 #, and third output voltage is obtained; the microwave radiometer receives the microwaves of the cold air emitted at the emission angle # imgabs3 #, and fourth output voltage is obtained; and calculating the radiance of the observation target at the exit angle # imgabs4 #. The rapid radiance measurement method can calculate the microwave radiance of the observation target without absolute calibration, and has the advantages of low hardware requirement, simple process operation and the like.

A retro-reflector comprising a front boundary surface configured for entry of measuring light into the retro-reflector and a back boundary surface configured for reflecting the measuring light as reflected measuring light. The front boundary surface and the back boundary surface are arranged on opposite sides of the retro-reflector, and an optical axis is defined by the arrangement of the front boundary surface and / or the back boundary surface of the retro-reflector, wherein an incidence angle of the measuring light relative to the optical axis is equal to an exit angle of the reflected measuring light relative to the optical axis. A first optical element is provided comprising the front boundary surface, and a second optical element is provided comprising the back boundary surface.

A light guide includes an exit extension region including a diffraction structure dividing an image light ray propagating in a first direction intersecting a thickness direction of a body, into image light rays propagating in a second direction intersecting the first direction, in the first direction, and allowing them to emerge therefrom. At least one part of the region satisfies that when refractive indices of media on individual incident and exit sides of a ray relative to the region are assumed to be equal to each other, an exit angle θ_out of a ray emerging from the region at the highest diffraction efficiency in a plane including a normal line of the region is not smaller than 15° and is not greater than 45°, and an incident angle θ_in of a ray incident on the region in the plane is greater than θ_out by 14° or more.

An angle amplifier (12) of this invention is an angle amplifier that a beamformed electromagnetic wave enters at a predetermined steering angle, and includes a plurality of metamaterial-based elements (121_1 to 121_n). The metamaterial-based element is formed by a metamaterial cell and a filling material, the plurality of metamaterial-based elements are arranged point-symmetrical with respect to a center of the angle amplifier, and an exit angle of the electromagnetic wave that exits from the angle amplifier is larger than the predetermined steering angle.　Hence, this invention can provide an angle amplifier capable of amplifying the steering angle of a beamformed incident electromagnetic wave beam.

The object of the present invention is to provide a lens and an optical system device capable of measuring the optical properties of a light source or optical element with a simple structure. The lens (1) has an optical axis and includes an incident surface (F) and an exit surface (B). The incident surface (F) and the exit surface (B) are configured such that light incident from a first position (O) at an illumination angle (θ) relative to the optical axis onto the incident surface (F) is refracted by the incident surface (F) and the exit surface (B) and exits from the exit surface (B) at an exit angle θ / m (m>1) relative to the optical axis. The apparent position of the light exiting from the exit surface (B) all starts from a second position (P). In addition, the optical system device includes the lens (1) and a diffuser plate for diffusing the light emitted from the lens (1).

The application discloses an optical device based on a transformed material curved wave beam and an implementation method, and belongs to the technical field of transformed materials and optical signal processing technology.The optical device comprises an input surface, a two-dimensional straight-edge Eaton lens based on a transformed material curved wave beam and an output surface.The application adopts a transformed optical method to transform a traditional Eaton lens into a straight-edge lens, obtains a transformation relationship between the traditional Eaton lens through conformal transformation, and then obtains medium parameters by using a transformed material method.The incident angle and the exit angle of light on the transformed two-dimensional straight-edge Eaton lens remain unchanged, the light rays which are at the same angle with the normal line of each point of the input surface in the traditional Eaton lens are equivalent to parallel light rays after transformation, the incident angle of the light rays is equal to the exit angle, the propagation path of the wave beam is changed with the change of the incident angle, the wave beam path can reach a very wide curved angle, and variable-angle turning can be realized in a single device;the isotropy is ensured, and the preparation in engineering is facilitated.