988 results about "Stray light" patented technology

The invention relates to the field of optical measurement, in particular to a reflective interference film thickness measurement method and system for eliminating back scattering of a transparent substrate, and the method comprises the following steps: transmitting a light beam through a low-coherence-length broadband light source, and forming linearly polarized light through polarization modulation; focusing the light beam to the surface of the film through a confocal optical system; collecting reflection interference signals of the upper surface and the lower surface of the film; spatial filtering, low-coherence gating and polarization control are used for cooperatively inhibiting back scattering of the substrate. And processing the acquired interference signal, and calculating to obtain film thickness information. According to the invention, triple inhibition mechanisms are adopted for synergistic effect, and the method comprises the following steps: spatial filtering: shielding out-of-focus back reflected light through a confocal small hole; low-coherence gating: using a short coherence length to naturally suppress a reflected signal beyond a coherence range; and polarization control: further weakening stray light interference through polarization state matching, and effectively suppressing back scattering of the substrate.

The invention relates to a star map stray light processing method based on multidirectional gradient, belongs to the technical field of space situation awareness, and solves the technical problems of low processing speed and inaccurate target edge information processing when the existing method is used for processing stray light under a complex illumination condition. Comprising the following steps: performing multidirectional gradient calculation on each pixel point of an original star map image containing stray light to obtain a multidirectional gradient value of each pixel point, and performing normalization processing to obtain a normalized gradient image; carrying out adaptive threshold segmentation on the normalized gradient image to obtain a binary image; performing morphological closed operation on the binarized image to obtain a contour image after the closed operation; and carrying out contour filling on the contour image after the closed operation, and carrying out mask processing to obtain a pure star map image with a reserved target area. The influence of strong stray light on target detection is effectively eliminated, and the precision and robustness of star map image target positioning are improved.

The invention relates to the technical field of airborne wind power measurement, and discloses an airborne wind measurement laser radar method and system. The method comprises the following steps: generating a scanning time sequence identifier and a path correction mark structure through scanning beat synchronization and stray light shielding processing; executing time-frequency demodulation and quality gating based on the back scattering signal to generate an observation wind speed initial value sequence; performing time alignment and motion compensation in combination with inertial navigation data, and generating a wind speed vector grid fragment through spatial interpolation and scanning geometric mapping; and finally, generating a configuration updating instruction structure through coordinate alignment and grid splicing. According to the invention, the precision and the anti-interference capability of wind field measurement in an airborne environment are effectively improved, and the data reliability and the system stability under a complex meteorological condition are remarkably enhanced through multi-source data fusion and a self-adaptive compensation mechanism.

The invention discloses a medical endoscope with an extinction anti-pollution structure, and relates to the technical field of endoscopes, the medical endoscope comprises an endoscope main body, the front end of the endoscope main body is provided with a camera module, and the periphery of the camera module is provided with an illumination light source for illumination, an outer sleeve and an extinction structural member; a hollow observation opening is formed in the center of the endoscope body in a penetrating mode, a light blocking sinking table used for blocking front direct light beams emitted by the illumination light source is arranged outside the hollow observation opening in a surrounding mode, and a deflection bevel edge used for diffraction deflection of light rays emitted by the illumination light source is further arranged outside the light blocking sinking table. Through the synergistic effect of physical shielding of the light blocking sinking table and diffraction deflection of the deflection bevel edge, front-side direct stray light of the illumination light source is cut off from the source, side-emitting and oblique-emitting light rays are deflected in a targeted mode, light spot and light fog pollution caused by diffuse reflection of the front end of a transparent guide sheath or a catheter is remarkably eliminated, and the imaging definition is remarkably improved.

The invention relates to a coaxial four-mirror optical system, which comprises a primary mirror, a secondary mirror, a third mirror, a fourth mirror and an annular diaphragm, all the mirrors and the annular diaphragm are coaxially arranged, both the secondary mirror and the third mirror are provided with light through holes, light is reflected by the primary mirror and then is reflected by the secondary mirror, the third mirror and the fourth mirror in sequence, and the light is reflected by the annular diaphragm. And finally converging and imaging. In the design, through application of the annular diaphragm, edge aberration is reduced, and stray light suppression capability is remarkably enhanced at the same time. The coaxial four-mirror optical system has the advantages of being compact in structure, high in imaging quality, wide in applicability and the like, and is suitable for being applied to multiple fields of aerospace, biomedicine, industrial detection and the like.

The utility model belongs to the technical field of monitoring equipment, and relates to a defect monitoring and identifying device which comprises a workbench (1), a mounting column (2) arranged on one side of the workbench (1), and a camera (3), a lens (4), an annular light source (5) and a light shielding plate (6) which are coaxially arranged from top to bottom, a light through hole (61) is formed in the light shielding plate (6), a first connecting structure (7) is arranged on the mounting column (2) in a sliding manner, and a second connecting structure (8) is arranged on the first connecting structure (7). The annular light source (5) is rotationally connected with the first connecting structure (7); a second connecting structure (8) is arranged below the first connecting structure (7), the second connecting structure (8) is in sliding fit with the mounting column (2), and the shading plate (6) is fixedly connected with the second connecting structure (8). The defect monitoring and identifying device disclosed by the utility model can effectively inhibit stray light and improve the detection precision.

A cap having a closed end and one or more openings is attached to the tip of an optical Raman probe sensor. The cap serves to block stray light noise from entering the tip of the sensor. In this way, Raman spectra may be more accurate and consistent. Further, the cap may be permanently affixed or removably attached to the sensor. In some embodiments, a reflective surface may be included on the interior surface of the closed end of the cap. This reflective surface may reflect Raman scattering light toward the tip, enhancing the received signal by a factor of 2 to 100.

To integrate an EUV collector, designed to guide EUV useful light and suppress stray light, into an EUV projection exposure system (1), which includes an EUV light source and illumination optics, a stray light suppression efficiency is first measured over a usable area of ​​the EUV collector. A low-suppression usable area section (43 optA high-impact target area (32) of the target area (42) is identified where the measured stray light suppression efficiency is lower than a given stray light suppression efficiency. Furthermore, a stray light exposure intensity is measured across a target area (42) in the useful light beam path at the location of an arrangement position of the useful area of ​​the EUV collector to be installed. A high-impact target area section (32) of the target area (42) is identified where the measured stray light exposure intensity is greater than a given stray light exposure intensity. The useful area is oriented relative to the target area (42) in an installation orientation in which the low-impact suppression target area section (43) is located. opt ) does not correspond to the high-impact target area section (32). The EUV collector is installed in the installation orientation. This results in an EUV collector with improved collector efficiency.

The invention relates to a packaging structure of a micro display chip and a display device, and the packaging structure comprises a substrate, the surface of which comprises a display area and a non-display area; the electrode pads are located in the non-display area; and a plurality of through hole plugs located in the substrate, wherein one end of each through hole plug is electrically connected with the electrode pad. In AR near-to-eye display application, the light absorption structure can effectively absorb stray light returned from components such as an optical waveguide and the like, secondary specular reflection of the metal electrode pad on the non-display area is avoided, ghosting is prevented from being formed, and the imaging contrast ratio and the picture purity are remarkably improved. The light absorption structure is integrated in the packaging structure, and a stray light feedback path is cut off through a physical means on the premise that normal light emitting of a display area and electrical connection of an electrode pad are not affected, so that the optical performance of the micro-projection ray machine is improved, the final display effect is guaranteed, and the display effect is improved. Therefore, the technical problem of image quality degradation caused by high reflectivity of the non-display area is effectively solved.

The invention discloses a stray light removing system of a diffractive optical element for beam splitting, which comprises a laser light source, the diffractive optical element for beam splitting, a first focusing element, a diaphragm, a second focusing element and a third focusing element which are sequentially arranged along the direction of a laser light path, and is characterized in that the diffractive optical element is used for splitting incident light into a plurality of sub-beams; a plurality of light through holes used for removing stray light are formed in the diaphragm corresponding to the plurality of sub light beams, the focal lengths of the first focusing element and the second focusing element are the same and are F, the distance between the diaphragm and the first focusing element and the distance between the diaphragm and the second focusing element are the same and are L, and L is equal to F. By forming a 4f filtering system, stray light of each sub light beam is effectively removed, and under the condition that the transmission characteristic of light is not changed, the whole structure is simple, operation is convenient, the yield of machined products is guaranteed, and cost is saved.

Techniques for facilitating stray light mitigation are provided. In one example, a method includes determining moving averages associated with an image. Each of the moving averages is associated with a respective window size. The method further includes determining a kernel based on the moving averages. The method further includes generating a stray light compensated image based on the image and the kernel. Related devices and systems are also provided.

The invention discloses an illumination device, an illumination adjusting method and wafer detection equipment. The device comprises an illumination light source, an illumination adjusting device and a wafer detection device, wherein the illumination light source comprises a light-emitting surface for exporting illumination light to the outside; the light-emitting surface adjusting part is used for adjusting the position of the light-emitting surface; the objective lens group comprises a plurality of objective lenses which are different in multiplying power and can be mutually switched, calibration data are pre-stored in the controller and comprise pupil plane size information, pupil plane position information and light-emitting surface position information of the objective lenses different in multiplying power, and the controller is used for adjusting the position of the light-emitting surface by the light-emitting surface adjusting part according to the multiplying power information of the objective lenses and the calibration data. According to the invention, rapid and automatic matching between the illumination system and pupil planes of objective lenses with different multiplying powers is realized, and uneven illumination and stray light caused by mismatching of the pupil planes are effectively eliminated.

The invention discloses a photoelectric imaging system multi-component optimization method based on full-link model driving. The method comprises the following steps: determining a parameter value range of to-be-optimized sensor parameters of multiple components in a target photoelectric imaging system; the to-be-optimized sensor parameters comprise focal length, aperture, pixel size and integration time; based on a pre-constructed full-link simulation model of a target photoelectric imaging system and a target genetic algorithm, performing iterative optimization on the parameter value range of the to-be-optimized sensor parameters to obtain target parameter values of the to-be-optimized sensor parameters under aberration-free and stray-free conditions; and determining a target aberration range and a target stray irradiance range of the target photoelectronic imaging system based on the target parameter values of the optimized sensor parameters. According to the method, the synergistic effect and the mutual coupling restriction relation between different component parameters can be integrated in the optimization process, and the performance of the optimized target photoelectric imaging system is improved.

The invention provides a projection lamp shadow effect intelligent adjustment method based on artificial intelligence, and the method comprises the steps: obtaining the material type and reflection coefficient of the wall surface of each region of an exhibition space through a pre-established wall surface material database, carrying out the classification processing according to the reflection characteristics of different materials, and obtaining a material reflection distribution diagram; acquiring light intensity distribution in the space based on stray light distribution characteristics, performing gridding decomposition on the light intensity distribution, and obtaining light intensity and light field distribution uniformity of each grid area through numerical integration; according to the adjusted projection angle and light source position, generating a control parameter for the projection equipment, adjusting the output intensity and direction of the projection light source, and obtaining the light distribution intensity after the control parameter of the projection equipment is adjusted; and if the contrast ratio and the color deviation value of the detail area do not meet the preset standard, optimizing the light source control parameters through an ambient light compensation mechanism in combination with the accumulated intensity data of the space corner to obtain a light compensation result.

A head-up display system is used for transmitting an image light beam to a light transmitting and reflecting element and comprises an image generating module and an optical module. The image generation module comprises an image generation unit, at least one curved reflector and a diffusion member. The image generating unit is used for generating an image beam, and the diffuser has a light incident surface. The at least one curved reflector is arranged on a transmission path of the image light beam between the image generation unit and the diffusion piece and is used for controlling at least one of a light angle and angle distribution of the image light beam entering the diffusion piece, so that the image light beam enters a light incident surface of the diffusion piece in a first direction, and is homogenized by the diffusion piece to form a light incident surface of the diffusion piece; and transmitting to the optical module. The normal direction of the light incident surface of the diffusion piece has a first included angle which is not zero relative to the first direction. The head-up display system can effectively reduce the stray light problem caused by external sunlight.

The invention discloses a multi-level diffraction grating precision displacement sensor and a displacement measurement method, and relates to the field of displacement sensors. The grating precision displacement sensor comprises a laser, a half-wave plate, a first non-polarization splitting prism, a + / -2-level diffraction interference grating precision displacement sensor module and a + / -3-level diffraction interference grating precision displacement sensor module. And a final displacement measurement result is calculated after weighting by taking the noise levels of the + / -2-level diffraction interference grating precision displacement sensor module and the + / -3-level diffraction interference grating precision displacement sensor module as weights. The multi-level diffraction grating precision displacement sensor provided by the invention improves the utilization rate of effective light by using the polarization characteristic of light, reduces the interference of environmental stray light on measurement signals, and improves the accuracy and stability of the whole system.

The invention discloses a display panel and a display device. The display panel comprises a plurality of light-emitting elements located on one side of a substrate, the light-emitting elements comprise first light-emitting elements and second light-emitting elements, the first light-emitting elements emit light in a shared mode, and the second light-emitting elements emit light in a peep-proof mode. The light blocking layer is located on the side, away from the substrate, of the light emitting element and comprises a plurality of light blocking structures. In the first direction, light blocking structures are distributed on the two opposite sides of the first light-emitting element, and light blocking structures are distributed on the two opposite sides of the second light-emitting element. In the second direction, light blocking structures are distributed on the two opposite sides of the first light-emitting element, light blocking structures are distributed on the two opposite sides of the second light-emitting element, and the first direction intersects with the second direction. According to the display panel and the display device provided by the embodiment of the invention, the light blocking structures are correspondingly arranged on the periphery of the first light-emitting element, so that large-angle stray light of the area where the first light-emitting element is located is inhibited, and the peep-proof effect is improved.

The invention relates to a refraction-super hybrid long-focus day and night confocal lens and an image acquisition device, and belongs to the field of optical lenses. The long-focus day and night confocal lens has focus consistency in a visible light band and an infrared band; comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens which are sequentially arranged from an object plane to an image plane along an optical axis; at least one of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens is a metasurface lens, and the other lenses are spherical lenses. By adopting the technical scheme of folding and super mixing, large-target-surface day and night common-focal-length imaging is realized, the use of glued lenses is reduced, the complexity of the system is reduced, the assembly difficulty is reduced, and the risk that a structural member generates stray light is reduced.

A monitoring device (46) is used to monitor an EUV collector of a projection exposure system. A detector assembly (38) of the monitoring device (46) has at least one stray light detector (47). i ) for detecting stray light radiation (20) with a stray light wavelength that differs from the useful light wavelength of useful light (3) generated by an EUV light source (2) by at least 10%, wherein the stray light radiation (20), originating from a component of the EUV light source, is reflected at a collector surface of the EUV collector. A detection component (37; 32) of the detector device (38) can be arranged in an illumination optics array (40) that is optically conjugated to a collector array of the EUV collector. Due to the monitoring, an increased collector efficiency can result.

The invention discloses a laser power monitoring device. A sampling mirror, a focusing mirror, a spectroscope, an attenuation filtering assembly and a power detection assembly are sequentially arranged in the light path direction. Wherein the attenuation light filtering unit comprises a first attenuation sheet, a second attenuation sheet and a light filter; real-time online monitoring of the laser power in the machining process is achieved, and instantaneous power fluctuation is effectively captured. The detection sensitivity is improved by the enhanced sampling signal intensity, the interference of environmental stray light is inhibited by the multi-stage light splitting structure, and the influence of thermal radiation is eliminated by the gradient attenuation and filtering combined design. The device can stably work in a high-temperature processing environment, and provides reliable data support for closed-loop power control.

The invention provides a light emitting diode and a light emitting device. The light-emitting diode comprises an isolation table top and a light-emitting area table top, the isolation table top is arranged around the light-emitting area table top, and an interval area is arranged between the isolation table top and the light-emitting area table top. A light-absorbing material layer is arranged below the light-emitting area table top, and the outer edge of the light-absorbing material layer is located in the area corresponding to the interval area. The outer edge of the light absorption material layer is arranged in the area corresponding to the interval area, stray light or reflected light generated in the process can be absorbed, the photoetching pattern precision of the interval area is improved, the problem that gallium nitride is left due to the fact that photoresist covers gallium nitride is solved, a potential leakage current path between the isolation table top and the light emitting area table top is cut off, and the light emitting efficiency is improved. The leakage current of the light-emitting diode is reduced, and the working stability and reliability of the light-emitting diode are improved.

The invention discloses an optical system of an infrared thermal imager, and the system comprises a super-structure lens module which employs a silicon-based super-structure lens, and achieves 3-5 [mu] m and 8-12 [mu] m multi-band focusing through a single sheet; the free-form surface lens is matched with the super-structure lens to correct asymmetric aberration; the multi-view-field switching mechanism is used for driving a zoom group through a micro stepping motor to realize switching between a wide angle and a narrow angle; the active athermalization compensation unit comprises an MEMS driver and a temperature sensor, and the lens spacing is dynamically adjusted through closed-loop control; and the intelligent processing module is integrated with an embedded FPGA processor and operates a deconvolution algorithm to suppress diffraction stray light at the edge of the super-structure lens. According to the optical system of the infrared thermal imager, the problems that a traditional infrared optical system is large in size, high in weight and poor in environmental adaptability are solved through the innovative optical design and manufacturing process, and efficient and long-time patrol flight detection of the unmanned aerial vehicle-mounted infrared thermal imager is achieved.

An optical navigation device includes a case, an illumination light source, an illumination lens, an optical detector and a first optical element. The case is movably located above a navigation surface. The illumination light source is disposed inside the case and adapted to emit an illumination beam. The illumination lens is disposed under the illumination light source and has an output surface. The illumination beam passes through the output surface to project onto the navigation surface. The optical detector is disposed inside the case and adapted to detect a reflection beam from the navigation surface. The first optical element is disposed adjacent to the output surface of the illumination lens and extended to an outer edge of the illumination lens, and adapted to eliminate a stray light beam generated by the illumination beam propagated between the illumination lens and the navigation surface from reaching the navigation surface.

The invention relates to the technical field of optical cement light transmission testing, in particular to an optical cement light transmission detection device. Comprising a supporting table, a control system, a light source emitter and a light source receiver, the control system is installed on the supporting table, and the light source emitter and the light source receiver are connected to the control system. By arranging a limiting block, a clamping plate, a shading frame, a shading film, a vibrator and a heating mechanism, the clamping action can be automatically triggered in the sample frame placing process, self-adaptive limiting and clamping in the front, back, left and right directions are achieved, and therefore the stability of a sample is ensured; in addition, external stray light can be effectively prevented from entering a light path system in the detection process, the situation that light transmittance data is virtually high due to the fact that ambient light is mistakenly received by a light source receiver is prevented, residual bubbles in the colloid can be effectively discharged through the synergistic effect of low-viscosity colloid and vibration, and the situation that the transmission light intensity is reduced due to bubble scattering or light reflection is avoided. Therefore, the authenticity and accuracy of the detection result are improved.

The embodiment of the invention provides a head-up display system, and belongs to the technical field of display. The head-up display system comprises an image generation unit, the image generation unit comprises a light source module, a collimation module, a micro-lens array module and a display panel which are parallel and sequentially arranged in the optical axis direction, light emitted by the light source module is adjusted to be parallel light through the collimation module, the micro-lens array module is used for deflecting the parallel light, and the display panel is used for displaying the light emitted by the light source module. A preset included angle is formed between the deflected light and the normal of the display panel; the reflector assembly is used for receiving external environment light and reflecting the received external environment light to the display panel, and the display panel is used for reflecting the external environment light to the direction deviating from the reflector assembly so as to eliminate stray light in the head-up display system. The head-up display system provided by the embodiment of the invention can effectively eliminate internal stray light, and is provided with the small-size image generation unit, so that the overall occupied space of the HUD is reduced.

The invention discloses a line laser 3D contourgraph working method integrating various stray light suppression algorithms, and the method comprises the steps: constructing a stray light sensitivity weight map based on a multi-exposure image sequence through the combination of a deep convolutional neural network and a point spread function; guiding Gaussian Laplacian pyramid adaptive filtering by using the weight map, and adjusting the filtering intensity by using a residual stability index to generate a purification intensity image; performing one-dimensional profile analysis based on the purified image and the original height map, calculating a morphological distortion index, extracting an energy concentration ratio through three-level wavelet packet decomposition, and triggering morphological restoration; performing center line extraction and motion blur correlation degree calculation on the repaired image, and performing anisotropic smoothing on the height map when a threshold value is exceeded; and registering the processed multi-frame height map, constructing geometric fidelity as a feedback driving genetic algorithm to optimize an initial parameter, and restarting a whole process until the fidelity meets a precision requirement. According to the invention, the precision of 3D imaging is improved through various stray light suppression algorithms.

The present application provides an optical folding element, a camera module, and an electronic device. The optical folding element comprises a first surface and a second surface which are arranged opposite to each other, wherein the first surface comprises an incident surface and an exit surface; the optical folding element further comprises a plurality of grooves; openings of the plurality of grooves are all formed on the second surface; and groove surfaces of the grooves can be used for reflecting light. First light enters the optical folding element from the incident surface, is reflected for multiple times in the optical folding element, and then is emitted out from the exit surface; and second light enters the optical folding element from the incident surface and is reflected in toward the incident surface under the action of the groove surfaces of the grooves. The optical folding element of the present application can effectively reduce the effect of stray light, thereby achieving good imaging quality.

The utility model discloses an optical element and an optical system, the optical element comprises an optical element body, the optical element body comprises a light transmission surface and a structural surface, and the light transmission surface and the structural surface jointly form an outer surface of the optical element body. The light transmission surface is used for transmitting light rays towards a light receiver, the structural surface is provided with a microstructure, and the microstructure is used for preventing the light rays projected to the structural surface from being transmitted towards the light transmission surface. According to the optical element provided by the embodiment of the utility model, the microstructure is arranged on the structural surface, so that stray light in the optical element body can be reduced, and stray light emitted from the emergent surface to the outside of the optical element body can be reduced, thereby improving the light emitting effect of the optical element, and improving the light emitting efficiency of the optical element when the optical element is applied to an optical system. The stray light emitted by the optical element is reduced, so that disordered imaging is not easy to form in the optical system, and the imaging effect of the optical system can be improved.

The utility model provides a kind of optical path turning element, it is equipped with incident plane, emergent surface, at least one first reflecting surface and at least one second reflecting surface, optical path turning element is equipped with multiple microstructures, multiple microstructures are set to at least one second reflecting surface and / or at least one first reflecting surface, microstructure is arc or broken line shape extension;Wherein, effective light enters optical path turning element by incident plane, after being reflected by at least one first reflecting surface, it is shot to the outside of optical path turning element by emergent surface;After stray light enters optical path turning element by incident plane, at least part stray light is reflected under the action of microstructure along the direction of incident plane, to make at least part stray light be shot to the outside of optical path turning element by incident plane.The optical path turning element can effectively eliminate stray light, improve imaging quality, and be conducive to reducing the volume of optical path turning element.The utility model further provides a kind of camera module and electronic equipment.

The optical detection system and method for suppressing stray light provided in this application include an illumination optical path and an imaging optical path sharing a common objective lens. An illumination beam transmitted along the illumination optical path illuminates the wafer under test through the objective lens and is reflected by the wafer under test to form an imaging beam. The imaging beam is transmitted along the imaging optical path through the objective lens for imaging. By arranging optical wedges in the illumination optical path, the illumination beam is incident at a non-parallel or non-coincident angle to the optical axis of the objective lens. Back-reflected stray light generated by multiple reflections between the lenses inside the objective lens is removed from the imaging optical path, which significantly suppresses back-reflected stray light and eliminates the influence of stray light inside the objective lens on imaging.