40 results about "Double reflection" patented technology

According to the large-depth-diameter-ratio micropore laser rotary-cutting precision machining system and method, light beam self-rotation and light beam scanning are achieved through a compact rotating assembly integrating a Dove prism and double reflectors, the off-axis angle and the off-axis amount are precisely regulated and controlled through deflection and movement of the reflectors, light beams are subjected to off-axis focusing through a focusing assembly, and the precision of laser rotary-cutting precision machining is achieved. Finally, a light path focusing mode of first converging and then off-axis focusing is formed, large-depth-diameter-ratio micropore machining is achieved, the aperture range is dozens of micrometers to several millimeters, and the maximum depth-diameter ratio can reach 15: 1 or above; the device is compact in structure, a complex adjusting system is not needed, the control mode is simple, high rotating speed can be achieved, ultra-short pulse time domain broadening is reduced through the double-reflector system, and machining of hole patterns such as steep straight holes and taper holes can be achieved.

An optical system (1) includes a lightguide (100) and an image projector (200). A coupling-in configuration includes a first planar reflector (250) forming an acute angle [3 with a major surface (101) of the lightguide and extending across a thickness h of the lightguide, and a second planar reflector (271) external to the lightguide and inclined at an angle 2|3 thereto. Light rays passing through a first part (Di) of the projector exit aperture impinge directly on the first planar reflector (250) and are reflected to impinge on major surface (101) of the lightguide at a first angle of incidence and light rays passing through a second part (D2) of the projector exit aperture impinge on the second planar reflector (271), are reflected towards the first planar reflector (150) and impinge on the second major surface (102) at the same angle of incidence.

The invention discloses an integrated system suitable for multi-mode polarization interference grating exposure. The integrated system comprises a laser, a collimation and beam expansion system, a first polarization regulation and control unit, a second polarization regulation and control unit, a first variable diaphragm, a second variable diaphragm, a space light absorption plate, a first reflection optical module, a second reflection optical module and a substrate. The invention aims to realize a more compact, stable and easy-to-adjust high-precision exposure device by simplifying an optical path structure, unifying an optical path and introducing a spatial partition polarization modulation mode. The system does not depend on a traditional PBS beam splitting structure any more, a needed interference field is directly generated through a single-beam expansion laser source, a symmetrical double-reflection interference structure is adopted, and the symmetry and stability of the system are greatly improved.

The invention relates to an interrogator system for interrogating fiber based sensors. The system comprises a broadband excitation light source illuminating a first lead fiber section having a wavelength shift response generating optical waveguide sensor, and a second lead fiber section having an in-line two reflectors based fiber interferometer sensor. The system also includes a detection 3 x 3 interferometer having an optical path difference arranged to match the wavelength shift response generating optical waveguide sensor and the in-line two reflectors based fiber interferometer sensor.

The utility model discloses a novel energy -conserving lamp, through the combination structure of split type stepped radiator and annular auxiliary radiator, cooperate the hinged design of double reflection cover, realize the combination of high -efficient heat dissipation and accurate light distribution. The main radiator adopts the stepped fin structure of three -level gradual change spacing, and the auxiliary radiator is equipped with annular fin group, and the reflection cover assembly includes relatively rotatable inner and outer double cover bodies, and realizes 0~120 degree stepless regulation through slide rail type angle adjusting mechanism. The structure can make the lamp operating temperature reduce by 30% or more, and the light efficiency utilization rate is improved by 45%, and simultaneously realizes the lightweight of lamp structure.

The invention relates to an expandable rotating paraboloid double-reflector system SAR (Synthetic Aperture Radar) antenna, belongs to the technical field of spacecraft antennas, and solves the technical problems that the expandable rotating paraboloid double-reflector system SAR antenna is large in folding envelope and low in profile precision. The SAR antenna comprises a reflector and a phased array feed source device, the reflector comprises a main reflector body, an auxiliary reflector body and a conical force bearing barrel, the main reflector body is of a rotating paraboloid structure after being unfolded, the auxiliary reflector body is located on the inner side of the rotating paraboloid structure and connected with the main reflector body through the conical force bearing barrel, and the conical force bearing barrel is connected with the main reflector body. The phased array feed source device is arranged in the conical force bearing barrel, the phased array feed source device comprises a horn radiation unit, a T / R assembly and a heat conduction table, the cross section of the heat conduction table is of an axial symmetry structure shaped like a Chinese character'ji ', and the phased array feed source device is fixedly connected with an upper cabin plate of a load cabin of a satellite through the bottom face of a heat conduction table unit. The SAR antenna is high in precision, small in size, good in heat dissipation effect and high in stability.

The utility model relates to the technical field of tunnel construction measurement and monitoring measurement, in particular to a double-reflector-plate support for measurement, which comprises a base, a mounting hole is formed in the bottom surface of the base, a positioning screw hole communicated with the mounting hole is formed in the left side surface of the base, a positioning panel is arranged above the base, and a through hole is formed in the middle of the positioning panel. A positioning clamping groove is formed in the top of the positioning panel, a positioning insertion plate is inserted into the positioning clamping groove, reflection pieces are bonded to the front face and the back face of the positioning insertion plate, and the centers of the reflection pieces are concentric with the through hole; the device is installed on an embedded steel bar on the side wall of the tunnel through the installation holes, and can be fixed through the positioning screws after the orientation of the reflector plate is adjusted, so that quick disassembly and assembly can be realized; a double-sided reflector plate is adhered to the positioning insertion plate, so that bidirectional monitoring and measurement can be realized; the device is simple in structure, low in manufacturing cost and convenient to install, and the cost is greatly saved on the premise that the quality of tunnel monitoring and measuring work is guaranteed by putting the device into use.

The application discloses a non-line-of-sight vehicle target multipath perception and positioning method and device based on an OFDM signal. Utilizing a base station multi-antenna received sensing integrated signal, after static clutter suppression, candidate propagation paths are extracted in a time delay, Doppler and angle of arrival joint parameter space; according to reflection geometric constraints in a T-shaped road, the candidate paths are divided into direct paths, first wall surface first-order reflection paths, second wall surface first-order reflection paths and interference paths; a multi-target path association and pairing scoring function is established according to time delay consistency, angle consistency, Doppler consistency, path energy credibility and reflection geometric residual, adaptive pairing of multiple target corresponding reflection paths is realized; according to the pairing result, a single reflection path positioning or double reflection path weighted fusion positioning mode is adopted to estimate the position and speed of each target. The application can improve the stability and path association accuracy of multi-target positioning and speed measurement in a non-line-of-sight and weak line-of-sight mixed scene of an urban road.

This invention discloses an SOA-DFB mutually coupled dual-feedback hybrid integrated chaotic semiconductor laser, relating to the field of semiconductor optoelectronic integration technology. The laser comprises a DFB laser chip, an SOA chip, a collimating lens, and a double-reflection transmission mirror arranged sequentially and coaxially. By adding an active device, the SOA chip, directly coupled to the DFB laser chip, the invention utilizes the broadband ASE noise generated by the SOA chip to inject backward into the DFB laser chip, causing disturbances to the optical field and intercarrier interactions within the laser. Simultaneously, combined with the strong-weak imbalance dual-cavity competition mechanism caused by the short and long external cavities formed by the front and rear reflecting surfaces of the double-reflection transmission mirror, the periodicity of a single feedback loop is effectively broken. This allows for the realization of high-bandwidth, low-delay, and high-power chaotic laser output without the need for complex optical injection systems and expensive optical isolators, offering advantages such as small size, low cost, high integration, and good stability.

The application provides a spatial dual-color off-axis reflective laser beam expander lens, which comprises a transition plate module, a main mirror chamber, a main mirror barrel, a main mirror module, a first folding mirror module, a second folding mirror module and a secondary mirror module. The first folding mirror module and the second folding mirror module make the light emitted by the dual-color laser to be folded twice by 90 degrees, and then match the outgoing light axis with the geometric mechanical axis of the main mirror module and the secondary mirror module, thereby completing off-axis emission of the laser. The main mirror in the main mirror module and the secondary mirror in the secondary mirror module are both parabolic reflecting surfaces and are both coated with a polarization maintaining dielectric film. The output light of the second folding mirror module is expanded and emitted after being reflected by the secondary mirror and the main mirror in turn, and the emitted light is quasi-parallel light. The application uses an off-axis cassette type dual-reflection mirror, does not need to correct chromatic aberration, has no obstruction on the light path, ensures the system efficiency and has no return laser entering the laser interior, thereby ensuring the system life. Through thermodynamic structure simulation, the whole machine structure design is guided, the system environmental adaptability and service life are improved, and the system thermal control cost is reduced.

The application discloses a kind of fast double reflection non-visual area imaging methods based on important light screening, which comprises: based on NLOS scene, calibrating sampling system, determine the size of the space to be reconstructed;Change laser light path illumination hidden space, obtain the shadow image generated by active illumination, process the shadow image based on calibration information, get the pose and shadow binary image under three-dimensional coordinates;Based on double reflection NLOS scene, light modeling is carried out, and the three-dimensional reconstruction network of shadow scene is built;The shadow binary image is sampled using a multi-resolution sampling method based on edge intensity;The shadow binary image after sampling is input into the reconstruction network for training with the pose;The shadow binary image obtained is dynamically sampled using a difference light sampling method;The three-dimensional reconstruction of NLOS dynamic scene is realized.The application realizes low delay in reflecting the dynamic change of the scene and completes the reconstruction of the moving object.

To provide an optical instrument for viewing a nearby object as a mirror image located farther away.SOLUTION: An object (6) such as a book or a game console is placed under a housing (1), and a light source (5) illuminates the object (6). Through double reflection by a half-transparent half-reflective mirror (3) and a reflective mirror (4), a user can view an image of the object located farther away in front of the housing (1). Adjusting a support member (2) can change the height of the housing (1), and changing the distance between the reflective mirror (4) and the object (6) can adjust the distance between the eyes of the user and the image of the object (6). Through double reflection, the image appears to be located farther away from the user. This allows the eyes of the user to remain in a state of viewing a distant object even when the user is looking at a nearby object (6), thereby reducing eye strain and preventing myopia.SELECTED DRAWING: Figure 1

The utility model discloses a spectrograph based on a double-plane reflection grating, and belongs to the technical field of spectrographs. The first plane reflection grating and the second plane reflection grating which are adjacently distributed are arranged in the spectrograph, light rays are subjected to secondary light splitting through the two plane reflection gratings, on the basis that the resolution of the spectrograph is guaranteed, a focusing lens with a large focal length does not need to be adopted, the overall size of the spectrograph is effectively reduced, the manufacturing cost is saved, and the cost is reduced. And the miniaturization design of the spectrograph is facilitated. In addition, the diffraction angle is increased by using the double reflection gratings, the problem that the diffraction angle of the near-infrared light for the high-scale density of the reflection gratings is small is solved, and the diffraction efficiency of the near-infrared light is improved.

The invention provides a back reflection dodging module, a lamp and a backlight source, the back reflection dodging module comprises a light source and a transflective part, the back reflection dodging module takes the light emitting surface orientation of the light source as the light emitting direction, the transflective part is arranged on the light emitting path of the light source, and the transflective part is arranged on the light emitting path of the light source. The light source is provided with a light emitting face and a light transmitting face protruding towards the light emitting face of the light source, so that when light of the light source is projected to the light transmitting face, the light is reversely reflected by the light transmitting face in the direction opposite to the light emitting direction and then is emitted in the light emitting direction through secondary reflection, and the illumination area is enlarged based on double reflection of the light in the axial direction. The dependence on a complex curved lens is reduced, the structure of the back reflection dodging module is simplified, the cost of the back reflection dodging module is reduced, and the production efficiency is improved.

Disclosed in the present invention is an integrated system applicable to multi-mode polarization interference grating exposure. The system comprises: a laser, a collimation and beam expansion system, a first polarization regulation and control unit, a second polarization regulation and control unit, a first variable aperture, a second variable aperture, a spatial light absorption plate, a first reflective optical module, a second reflective optical module and a substrate. The present invention aims to realize a more compact, stable and easily adjustable high-precision exposure apparatus by simplifying an optical path structure, unifying an optical path length and introducing a spatially partitioned polarization modulation method. By no longer relying on traditional PBS beam-splitting structures, the system directly generates a required interference field by means of a single-beam expanded laser source, and uses a symmetric dual-reflection interference structure, thereby greatly enhancing the symmetry and stability of the system.

A two-mirror assembly, which includes a first mirror which is an aspherical mirror, a second mirror located away from the first mirror, and an open cavity formed between the first mirror and the second mirror. Embodiments of the invention provide open cavities that are stable cavities including a direct injection stability and a real ray stability.

The invention relates to different variants of reflectors (220), which alone or together with a light unit (210) also described form a space-saving high-luminosity system.

The guide cylinder comprises a cylinder body, an upper opening is formed in the upper end of the cylinder body, a lower opening is formed in the bottom surface of the cylinder body, the diameter of the lower opening is gradually reduced from top to bottom, an inclined plane or an inclined concave surface is formed between the upper edge and the lower edge of the lower opening, and a dark coating is arranged at the bottom of the cylinder body. The diameter of the upper opening of the guide cylinder is larger than that of the lower opening of the guide cylinder. According to the utility model, a single and clear inverted image formed by the lower opening of the guide cylinder in the silicon liquid level can be collected when the target liquid opening distance is positioned, and double inverted images cannot be collected, so that the target liquid opening distance is accurately positioned, and the success rate of drawing a silicon single crystal rod is improved.

The application relates to the field of information and communication technology, and relates to a joint beamforming method based on end-to-end learning in a multi-RIS assisted communication system, and aims to improve the bit error rate performance of the communication system.The application provides a joint beamforming method based on end-to-end learning, wherein single reflection and double reflection links are actually considered, and a bit error rate minimization problem is formulated by jointly designing active and passive beamforming.In order to solve the non-convex problem thus generated, a new method is introduced, and the proposed multi-RIS assisted communication system is regarded as an end-to-end optimization task.Specifically, modulation, precoding, passive beamforming, combination and demodulation processes are simultaneously optimized to avoid local optimization.Simulation results show that, compared with a traditional alternating optimization algorithm, the system based on end-to-end learning in the application realizes a competitive performance gain.In addition, under the condition that the total number of reflection elements is the same, the performance enhancement of multiple RISs relative to a single RIS assisted system is verified.

The utility model discloses a double-reflecting-surface antenna with an auxiliary reflecting surface capable of being overturned, unfolded and folded. The double-reflecting-surface antenna comprises a main reflecting surface, the auxiliary reflecting surface, a feed source, a fixed frame, a storage position locking structure and a working position locking structure. Due to the fact that the movable fixing frame is hinged to the fixed fixing frame, by rotating the movable fixing frame, the movable fixing frame can be located at the storage position of the side portion of the fixed fixing frame and can also be located at the working position of the top of the fixed fixing frame. When the double-reflector antenna is transported, the movable fixing frame can be rotated to the side part of the fixed fixing frame and is locked through the storage position locking structure, the overall height of the antenna is reduced while relative rotation does not occur, and thus transportation is facilitated. When the double-reflector antenna needs to be unfolded to a working state, only the movable fixing frame needs to be rotated to the top of the fixed fixing frame and is locked through the working position locking structure. Therefore, the double-reflector antenna is simple in structure, and the problem of overrun of a vehicle-mounted antenna in the highway and railway transportation process can be solved.

An EUV polarizer (24) converts incident EUV light along a useful beam path into linearly polarized EUV useful light. The EUV polarizer (24) has a plurality of double-reflecting surface units (29) with a first reflecting surface (29.1) and a second reflecting surface downstream in a useful beam path. EUV light incident on the first reflecting surfaces (29.1) during operation forms an angle of 43° ± 10° with the first reflecting surfaces (29.1). One polarization direction of the linearly polarized EUV useful light is perpendicular to an incident plane of the EUV light on the first reflecting surface (29.1). An entrance aperture of the EUV polarizer (24) is divided into at least two polarization aperture regions (26, 27). In a first polarization aperture region (26) several of the double reflection surface units (29) are oriented to polarize the EUV light along a first polarization direction.In a second polarization aperture region (27), several of the double reflection surface units (29) are oriented along a second polarization direction to polarize the EUV light. The two polarization directions form an angle of at least 7° to each other. Such an EUV polarizer allows for the setting of demanding illumination parameters for EUV projection lithography.

The invention discloses a ghosting-free waveguide type head-up display system and a ghosting-free imaging method, and belongs to the technical field of vehicle-mounted display. The system comprises an image generation module, a collimation optical system, a waveguide assembly and a vehicle windshield. The HUD light emitted by the waveguide assembly only contains the P polarization component and is emitted to the glass surface at the incidence angle close to the Brewster angle of the windshield, and the characteristic that the reflectivity of the first surface approaches zero when the P polarization light is emitted at the Brewster angle is utilized, so that an HUD image is only reflected by the second surface to form a single virtual image; therefore, the ghosting problem caused by double reflection of the front surface and the rear surface in the traditional HUD is thoroughly eliminated. According to the system, a wedge-shaped windshield is not needed, the manufacturing complexity and cost are reduced, meanwhile, the waveguide technology is combined to achieve compact structure and large-view-field display, and the imaging definition and the driving safety are remarkably improved.

An optical system (1) includes a light guide (100) and an image projector (200). The coupling-in configuration includes a first planar reflector (250) forming an acute angle [beta] with a major surface (101) of the light guide and extending across a thickness h of the light guide, and a second planar reflector (271) external to the light guide and inclined at an angle 2 [beta] relative to the light guide. Light passing through a first portion (D1) of the projector exit aperture directly impinges on a first planar reflector (250) and is reflected to impinge on the major surface (101) of the light guide at a first angle of incidence, and light passing through a second portion (D2) of the projector exit aperture impinges on a second planar reflector (271), reflected towards the first planar reflector (150), and reflected to impinge on the major surface (101) of the light guide at a second angle of incidence. And irradiates on the second main surface (102) at the same angle of incidence.

The invention discloses a high-temperature-resistant integrated ring-focus antenna with a ceramic dielectric metallized structure, which comprises double reflecting surfaces of the ceramic dielectric metallized structure, and the double reflecting surfaces comprise a main reflecting surface supporting structure and an auxiliary reflecting surface supporting structure which are made of ceramic materials. Metal layers are plated on the inner surfaces of the main reflecting surface supporting structure and the auxiliary reflecting surface supporting structure, a feed source is arranged at the bottom of the main reflecting surface supporting structure, a radome is arranged at the top of the auxiliary reflecting surface supporting structure, and the radome is integrated with the auxiliary reflecting surface supporting structure and the metal layer on the surface of the auxiliary reflecting surface supporting structure. A heat shield can be arranged between the main reflecting surface supporting structure and the auxiliary reflecting surface supporting structure. The VSWR (Voltage Standing Wave Ratio) of the ring focus antenna is less than or equal to 1.75 in a frequency band from 34.4 GHz to 35.4 GHz, and the gain range of 32.7 to 34.3 dBi can be realized. Within 1500s when the antenna window is continuously loaded with the high temperature of 1200 DEG C, the temperature of the feed source port is 27 DEG C and 34 DEG C respectively when the heat shield exists or not.

An autostereoscopic display device with backlight real-imaging is adapted to an imaging semi-reflective mirror. In the autostereoscopic display device with backlight real-imaging, a backlight module collocates with an off-axis dual mirror module to generate a directional backlight beam in smaller space. The equivalent distance between the backlight module and an imaging concave mirror is greater than the focal length of the imaging concave mirror, and the eye box array of the real image of the backlight module is generated by the imaging concave mirror. According to the position of an eye movement, backlight sources are switched to facilitate an image beam to cross at the corresponding small eye box of the eye box array. The plurality of small eye boxes are used to correspond to one eye to improve the tracking buffer when the eye moves quickly and to avoid image interruption.

The application discloses a 2D-DIC-based full-field deformation measurement method and device for a planar elongated area under a small field of view, and belongs to the technical field of deformation measurement. The method comprises the following steps: collecting panoramic images of a planar elongated area by using a virtual camera array in a field-of-view limited environment; achieving high-precision strain field measurement by means of double-mirror out-of-plane motion compensation, system static error compensation, and adaptive image splicing and fusion algorithms; finding accurate splicing positions by using a sub-set correlation and frequency domain shift theorem-based sub-pixel compensation method, achieving high-precision image splicing, and obtaining high-resolution images; and replacing a linear weight curve of a traditional fade-in and fade-out method fusion function with a sine trigonometric function, so that second-type discontinuous points generated at a boundary position of an overlapping area are eliminated. The application enables 2D-DIC to be effectively applied to high-resolution and high-precision strain field measurement of a planar elongated area under a small field of view.

An optical system (1) includes a lightguide (100) and an image projector (200). A coupling-in configuration includes a first planar reflector (250) forming an acute angle β with a major surface (101) of the lightguide and extending across a thickness h of the lightguide, and a second planar reflector (271) external to the lightguide and inclined at an angle 2β thereto. Light rays passing through a first part (D1) of the projector exit aperture impinge directly on the first planar reflector (250) and are reflected to impinge on major surface (101) of the lightguide at a first angle of incidence and light rays passing through a second part (D2) of the projector exit aperture impinge on the second planar reflector (271), are reflected towards the first planar reflector (150) and impinge on the second major surface (102) at the same angle of incidence.

The invention discloses a compact light path and gas cell, which comprises a double-reflecting-surface combined mirror, a first secondary mirror, a primary mirror, a second secondary mirror and a return mirror, the first secondary mirror, the second secondary mirror and the primary mirror form a White cell structure, and the double-reflecting-surface combined mirror is provided with a first reflecting surface and a second reflecting surface which are intersected; an incident light beam is reflected by a first reflecting surface of the double-reflecting-surface combined mirror and then is reflected for multiple times among the first secondary mirror, the primary mirror and the second secondary mirror to form a first reflecting light path, and the first reflecting light path is reflected to the return mirror by the second secondary mirror; and the light beam is reflected for the same times among the second secondary mirror, the primary mirror and the first secondary mirror after being returned by the return mirror to form a second reflection light path, and reaches the second reflection surface to be reflected to form an emergent light beam. The gas cell has the beneficial effects that optical path multiplication is realized in a limited space, the incident angle and the divergence angle of an incident beam and the emergent angle and the divergence angle of an emergent beam are allowed to be flexibly adjusted, and the overall performance and the use flexibility of the gas cell in a spectral analysis system are improved.

The invention provides a metal thick plate damage detection method based on double reflection longitudinal wave extraction signal characteristics, and relates to the technical field of metal material nondestructive testing, the method comprises the following steps: S1, establishing a metal thick plate structure damage detection model, and extracting time-space domain receiving signals; s2, interference of Rayleigh waves, direct longitudinal waves and direct transverse waves on damage detection of the metal thick plate is filtered out in the time-space domain receiving signals; s3, on the basis of the wave field data after the interference waves are eliminated, interference of primary reflection longitudinal waves and primary reflection transverse waves on damage detection of the metal thick plate is filtered out; s4, extracting wave field data of secondary reflection longitudinal waves propagating in the metal thick plate from the complex spectrum matrix after the primary reflection waves are filtered out; and S5, extracting an envelope signal based on the wave field data of the secondary reflection longitudinal wave, and realizing damage positioning of the thick metal plate through time domain feature mutation detection. According to the invention, the technical problem that secondary reflection longitudinal wave signals are difficult to extract under strong interference is solved, and high-sensitivity identification and detection of metal thick plate damage are realized.

The present invention relates to a beam line system and method for spectral purification and effect verification thereof, comprising: an upstream radiation source interface for receiving broad spectrum radiation; the bunch transmission channel is used for limiting a radiation propagation path; the switchable spectrum blocking verification assembly can be switched between a first working state in which the switchable spectrum blocking verification assembly is inserted into the radiation propagation path and a second working state in which the switchable spectrum blocking verification assembly is moved out of the radiation propagation path, and is used for regulating and controlling radiation entering a subsequent structure under different spectrum conditions; the spectrum selection and purification assembly is used for carrying out selective transmission and spectrum purification on radiation of a specific target wave band; and the downstream detection unit is used for receiving and detecting the radiation treated by the spectrum selection and purification assembly. The beneficial effects of the invention are that through the combination of the double-reflector spectrum selection system and the narrowband filter membrane assembly, the multi-stage selection of the radiation of the specific target wave band is realized, and the spectral purity of the radiation of the target wave band can be improved.