1086 results about "Laser projection" patented technology

The invention discloses a dynamic calibration type laser surface real-time detection method and system, and the method comprises the following steps: obtaining initial calibration parameters of a laser projection module and a high-speed imaging module through a standard calibration plate, building an initial measurement coordinate system through a camera calibration method, and building a dynamic calibration model; through a dynamic calibration mechanism, calibration parameters are updated in real time, and a sub-pixel-level laser light strip center coordinate extraction method is combined, so that the detection precision is effectively improved, and tiny surface defects can be detected; by responding to changes of environmental parameters such as vibration, temperature and illumination intensity in real time and automatically triggering a calibration process, it is ensured that a high-precision detection result can still be kept in a complex industrial environment; by adopting the mode of combining the standard calibration plate and the workpiece reference area, the calibration time is shortened, and for workpieces of different models, quick adaptation can be achieved through quick migration of pre-training model parameters and a federal learning mode, and the production efficiency is improved.

The invention belongs to the technical field of tunnel excavation, and particularly relates to a method for projecting a tunnel excavation contour through multi-beam visible laser. Comprises: S1, establishing a tunnel line model; s2, establishing a two-dimensional rectangular coordinate system on the excavation section of the tunnel; s3, arranging more than three target positioning points on the excavation section of the tunnel, and installing reflecting lenses on the target positioning points; s4, converting the space coordinates of the target positioning point obtained in the step S3 under the construction engineering coordinate system into a two-dimensional rectangular coordinate system; s5, converting the two-dimensional rectangular coordinates of each point of the theoretical tunnel contour model into three-dimensional space coordinates; s6, erecting a laser projection device; s7, calculating the horizontal angle and the vertical angle obtained in the step S5 by the laser projection device, and controlling a motor to quickly adjust the angles of the reflecting lenses of the X axis and the Y axis respectively; s8, adjusting the angles of the reflecting lenses of the X axis and the Y axis of the related positioning point; and S9, averaging the mileage of the target positioning point of each total station obtained in the step S4, and taking the averaged mileage as the mileage of the current excavation face to carry out informatization management.

The invention discloses a large workpiece strain measuring point auxiliary positioning system and method, and the system comprises a professional software and automatic control system, and an industrial photogrammetry system, a car lifting system, a laser projection system and a three-dimensional scanning quantitative analysis system which are connected with the professional software and automatic control system. And a positioning target is arranged on the surface of the large workpiece product. According to the system, strain contact auxiliary lineation and laser guide assembly work of a large workpiece and quantitative analysis work of strain gauge pasting are achieved, the system takes a target arranged on a product as a positioning reference, the outline of a product model is extracted in a photogrammetry mode, the product model and a real object are matched and unified to the same coordinate system, and the product model and the real object are obtained. The position contour of the strain gauge needing to be pasted and auxiliary information are projected to the surface of a product through the laser projection technology, the current pasting position information can be efficiently and accurately reflected, and high-efficiency and high-precision assembly of the strain gauge is facilitated.

The invention discloses a non-ferrous metal ingot detection method and equipment based on three-dimensional vision. Belongs to the field of nonferrous metal detection. The method comprises the steps of construction of a three-dimensional pixel model with laser projection structured light projection and line laser scanning camera shooting, adaptive filtering preprocessing, establishment of a three-dimensional point cloud model through deep learning, feature information extraction, deep learning algorithm identification and classification, production process problem analysis and optimization and the like in sequence. Therefore, high-precision, multi-angle and all-directional detection of the non-ferrous metal ingot is realized. The equipment comprises a multi-axis collaborative three-dimensional visual inspection subsystem consisting of a mounting bracket, an X-Y-Z servo motion platform, a line laser scanning camera and the like. According to the method, the quality detection precision and defect detection rate of the non-ferrous metal ingot can be effectively improved, detailed product quality analysis is provided, and the method plays an important role in improving the product quality, optimizing the production process and reducing the production cost.

The invention discloses a laser projection light source and laser projection equipment, the laser projection light source comprises a shell, a plurality of lasers and a plurality of light combination mirror groups in one-to-one correspondence with the lasers, each light combination mirror group comprises a plurality of reflectors, the lasers are mounted at a plurality of accommodating openings in a first side wall, and the reflectors are mounted at the accommodating openings in the first side wall. A second side wall perpendicular to the first side wall is provided with a light outlet; the light-emitting surface of the at least one laser comprises a first light-emitting area, a second light-emitting area and a third light-emitting area which are respectively used for emitting a first color light beam, a second color light beam and a third color light beam with different polarization directions, and the at least one wave plate is located between one light-emitting area and one reflecting mirror. The laser projection light source is used for the laser projection equipment.

The invention discloses a shield tail gap measurement method based on instance segmentation and laser projection error compensation, and belongs to the technical field of shield construction automatic measurement. The method solves the problem that in the prior art, projection coordinate deviation is caused by shield type TBM mechanical vibration and laser thermal drift, and then shield tail gap measurement precision is affected. According to the technical scheme, the method comprises the steps that multiple sets of lasers are arranged in the circumferential direction of a shield tail to project fringes to segments; synchronously acquiring images through an industrial camera; respectively extracting a segment seam sub-pixel boundary and a laser stripe center line by using a double-branch instance segmentation network; performing real-time vibration and temperature drift compensation on the laser projection point based on a thermal-mechanical coupling error model; and finally, calculating a gap value and three-dimensional gradient distribution through point cloud registration. The method is mainly used for high-precision and real-time dynamic measurement of the gap between the shield tail and the duct piece in the tunneling process of the shield type TBM.

The invention discloses a pipeline inner wall panoramic three-dimensional scanning device and a measuring method, and the device comprises a panoramic plane laser generator which comprises a point laser generator, an axicon, a laser focusing lens, a conical surface reflector and a transparent cylindrical support, and is used for transmitting a 360-degree panoramic plane laser beam to the inner wall of an object to be measured; according to the invention, single-exposure full-circumferential high-precision three-dimensional measurement is realized, and the device can synchronously obtain complete three-dimensional point cloud data of the circumference of the inner wall of the whole pipeline at the moment of single exposure through innovative combination of a panoramic annular imaging system and a panoramic planar laser projection technology; the method has the advantages that axial rotary scanning or multi-view data splicing required by a traditional method is avoided, measurement efficiency is improved, splicing accumulative errors are avoided, laser stripe image acquisition is complete and free of breakpoints, and completeness and accuracy of three-dimensional reconstruction data are guaranteed from the source.

The invention discloses a steel member laser stripe detection method and system based on an artificial intelligence algorithm. The method comprises the following steps: S1, projecting a stripe pattern to the surface of a to-be-detected steel member by using laser projection equipment; s2, capturing laser stripe images modulated on the surface of the steel member from at least two different angles; s3, preprocessing the captured laser stripe image to eliminate noise and enhance image contrast; s4, inputting the preprocessed image into the trained artificial intelligence model; s5, outputting a defect detection result of the surface of the steel member by the artificial intelligence model; and S6, generating a quality evaluation report of the steel member. According to the method, various defects on the surface of the steel member can be automatically and efficiently identified and analyzed, the method is of great significance in improving the production efficiency, reducing the labor cost and guaranteeing the product quality, and high-precision detection and analysis of the surface defects of the steel member are achieved through the steps of image preprocessing, feature extraction, defect identification and classification.

The invention relates to the technical field of laser processing, in particular to a linear laser engraving method and a laser engraving machine. The linear laser engraving method comprises the steps that a laser engraving path is obtained according to an engraving line pattern, the laser engraving path comprises a plurality of line segments, and the laser engraving path is split into a plurality of target line segment laser engraving paths; acquiring a moving path of a laser engraving head according to the laser engraving path; in combination with the engraving parameters, speed changes of the laser engraving head when the laser engraving head goes through the laser engraving paths of the target line segments are obtained; and the moving path or / and the laser projection state of the laser engraving head are / is adjusted, so that the energy per unit length of the laser projected to the laser engraving path of the original target line segment is within the error range. The carving depth of the carved pattern is consistent, and the visual sense is good.

The utility model provides an optical machine illumination system and laser projection equipment, and relates to the technical field of laser display. According to the optical machine illumination system, the first face of the first prism is arranged to be the curved face, the first face is used for collecting the illumination light beam and adjusting the incident angle of the illumination light beam entering the second face to replace a lens, materials and space of the lens are saved, and the system size and the number of optical elements can be effectively reduced; and miniaturization of the equipment is facilitated. Meanwhile, by adding the second prism, the propagation path of the light beam is prolonged, so that the projection light beam and the non-projection light beam can be separated, and the contrast ratio is improved.

The invention provides an acupuncture point accurate positioning device based on machine learning, and relates to the field of artificial intelligence. Comprising a multi-modal data acquisition module, a data preprocessing module, a machine learning processing module, a dynamic adaptive calibration module, a gender specificity optimization module, a laser projection module and an interaction and control module, wherein the multi-modal data acquisition module is used for acquiring human body surface sign information and human body three-dimensional space coordinate information; temperature difference information and human body posture data of the acupoint area and surrounding tissues; the machine learning processing module is internally provided with a trained improved convolutional neural network model, performs feature extraction and fusion on the data processed by the preprocessing module, and outputs initial acupuncture point coordinates; the dynamic self-adaptive calibration module dynamically corrects the coordinates of the acupuncture points; the gender specificity optimization module analyzes gender information of a patient and performs targeted adjustment on initial acupuncture point coordinates. According to the invention, the defects in precision, efficiency, adaptability and scene expansibility in the prior art are overcome.

The invention discloses a dynamic multi-spot projection optical system based on an LED light source, which comprises the LED light source, a reflecting cover, a grating sheet, a condensing lens, a concave reflector and an optical reflection assembly, and is characterized in that the LED light source is arranged at the bottom of the reflecting cover, and the grating sheet is provided with a light-transmitting area with a preset pattern shape; the reflecting cover consists of a plurality of plane reflectors A; the concave reflector consists of a plurality of plane reflectors B; light emitted by the LED light source forms a pattern light beam through the grating piece, the light beam is divided and reflected into a plurality of sub light beams through the conical reflecting cover, and the sub light beams are guided to the condensing lens through the optical reflecting mirror set. According to the invention, a low-cost, laser-free and safe LED scheme is adopted, and through innovative optical design, a complex dynamic light and shadow effect comparable to or even surpassing laser projection is realized, and the imaging definition is kept unchanged within a projection distance range of 2-15 meters.

The invention discloses a laser beam combining system applied to a multi-primary-color laser projector, and belongs to the technical field of laser projectors. Comprising a light source module, a reflector unit and a dispersion element which are sequentially arranged in the light propagation direction. The light source module outputs multiple beams of monochromatic laser with different wavelengths, the reflector unit reflects the multiple beams of monochromatic laser with different wavelengths to the dispersion element at a specific angle, and the dispersion element combines the multiple beams of laser with different wavelengths into one beam. When the principle is utilized, the incident light with different colors is required to be narrow-linewidth laser, while a common LED light source is wide in spectrum, so that the position of an output light field is deviated due to dispersion when the light is incident into a dispersion element, and the system performance is greatly reduced. The light source of the laser projector is narrow-linewidth laser, and the characteristics of the light source just meet the required conditions, so that the laser beam combination system provided by the invention can be used for realizing the beam combination of the laser of the multi-primary-color laser projector.

The embodiment of the invention discloses a clothing care flatness monitoring method, electronic equipment and fabric cleaning equipment, and belongs to the technical field of clothing care and monitoring. The clothing care flatness monitoring method comprises the following steps: acquiring a multi-angle RGB image and laser projection reflection data; according to the multi-angle RGB image and the laser projection reflection data, obtaining multi-modal fusion data of the surface of the to-be-nursed clothes; determining two-dimensional texture features and three-dimensional deformation features of the surface of the to-be-nursed clothes based on the multi-modal fusion data; determining a three-dimensional wrinkle strength index according to the two-dimensional texture features and the three-dimensional deformation features; and determining the flatness of the to-be-nursed clothes based on the three-dimensional wrinkle strength index. According to the method, the optical image and the laser structured light data are combined, so that the spatial accuracy of wrinkle recognition is remarkably improved, meanwhile, real-time decision support is provided for intelligent nursing equipment, the situation of excessive nursing or insufficient nursing is effectively avoided, and therefore the nursing effect is improved, and meanwhile energy consumption is reduced.

The invention relates to a detection module, a detection device, a digital detection system and a detection method. The detection module comprises a scanning unit, the scanning unit is arranged to perform three-dimensional scanning on a detected surface, the scanning unit comprises a laser projection device and a laser receiving device, the laser projection device comprises a laser source and an MEMS micro scanning mirror, and the laser receiving device is arranged to receive laser returned from the detected surface to obtain a laser image of the detected surface; and the processor is arranged to receive the laser image and process the laser image so as to detect defects on the detected surface. The scanning unit further comprises an RGB image sensor to acquire an RGB image of the measured surface, and the processor is further arranged to detect a defect on the measured surface from the acquired RGB image and based on the laser image and the RGB image. According to the invention, the detection precision of the detection module can be improved while the miniaturization of the detection module is realized.

The invention relates to the technical field of unmanned aerial vehicle application and highway engineering monitoring, in particular to a highway slope engineering inspection unmanned aerial vehicle which comprises a multi-rotor aircraft provided with a flight controller, the bottom of the multi-rotor aircraft is connected with a first holder, a plurality of supporting legs are arranged on the periphery of the first holder, and a second holder is arranged at the bottom of the first holder. An equipment tray is arranged at the bottom of the second holder; the laser projector is fixed at the bottom of the equipment tray and is used for projecting a reference image; the marking gun is fixed at the bottom of the equipment tray and is used for emitting marking paintballs; the high-definition camera is fixed to the bottom of the equipment tray and located between the laser projector and the marking gun. Optical axes of the high-definition camera and the laser projector are parallel to each other and are consistent with the emission direction of the marking gun; through multi-module collaborative operation, the slope inspection efficiency and precision are remarkably improved, and the system is particularly suitable for high-precision and automatic slope disease detection and safety evaluation under complex terrain conditions.

The invention provides a mixed tower drum monitoring method and device based on combination of laser vision and a YOLOV5 model, electronic equipment, a storage medium and a program, and relates to the technical field of mixed tower drum swing monitoring. S10, an original image is acquired, the original image is preprocessed, and a preprocessed ROI image is output; s20, inputting the preprocessed ROI image into a pre-trained YOLOv5 model, and outputting a cross light spot dynamic parameter sequence; s30, outputting a synchronous six-dimensional time sequence data matrix according to the cross light spot dynamic parameter sequence; and S40, outputting a 28-dimensional normalized feature vector according to the synchronized 6-dimensional time sequence data matrix. Through the cooperation of the above structures, the device has the following beneficial effects: 1, through a non-contact measurement mode of laser projection and image acquisition, the damage of a traditional sensor to a tower drum structure is avoided; and secondly, top laser projection can be combined with an AI model to identify millimeter-level displacement change, so that a traditional monitoring blind area is made up, and the instability risk of the top structure is warned in advance.

The invention provides an on-orbit calibration method for a space target pose measurement system based on vision and laser fusion, which is used for solving the problems that in the existing calibration method based on a checkerboard and other special calibration objects, the calibration objects are poor in setting universality for specific use scenes; or the existing calibration method based on a common scene has the technical problems of large calculation amount and relatively high requirements on calculation resources. According to the vision and laser fused space target pose measurement system on-orbit calibration method provided by the invention, firstly, a joint calibration model of a vision sensor and a laser range finder is established, and on the basis, a traditional orthogonal iteration algorithm is improved from two aspects of calculation of an iteration initial value and simplification of the iteration algorithm, so that the calibration precision of the visual and laser fused space target pose measurement system is improved. In order to solve and optimize the pose conversion relation between a laser coordinate system and a visual coordinate system, only one part of a spatial non-cooperative target is used as a laser projection target, and in-orbit high-precision calibration of a visual sensor and laser range finder combined pose measurement system can be realized.

The present disclosure belongs to the technical field of display. Provided are a laser projection device and an image display method. On the basis of a video signal, a display driving component (102) sends an enable signal and a PWM signal to a laser driving component (105), sends an enable signal to a phase light modulation component (107), and sends a display driving signal to a light modulator (103). The laser driving component (105) sends a light source driving signal to a light source component (104) on the basis of the enable signal and the PWM signal, so as to drive the light source component (104) to emit primary-colored light. A video processing component (106) sends a phase video signal to the phase light modulation component (107) on the basis of the video signal. The phase light modulation component (107) performs phase light modulation on the basis of the phase video signal and the enable signal, so as to emit modulated light to the light modulator (103). The present disclosure redistributes light energy in space, and thus improves the peak brightness and the light energy efficiency.

The embodiment of the invention discloses a digitalized assembling method of a helicopter fairing, which comprises the following steps of: 1, scanning the surface of the fairing and the surface of a helicopter body structure, and acquiring a three-dimensional contour model of the surface of the fairing and the surface of the helicopter body structure according to scanning data; 2, generating a visual assembly correction scheme by comparing the three-dimensional contour model with a design model imported into a controller; 3, in the fairing assembly process, a visual assembly correction scheme is projected through laser, non-contact hole making and polishing guiding are achieved, and digital assembly of the fairing is implemented; and 4, in the fairing assembling process, dynamic position information of the fairing and all the positioning targets on the aircraft body structure is obtained, the moving track of the fairing in the assembling process is solved, automatic alarming is conducted when the fairing is out of tolerance, and laser projection is frozen. The problems that an existing fairing assembling mode is low in assembling efficiency and precision, and the production efficiency and the assembling requirement of a helicopter are difficult to meet are solved.

The invention relates to a pipeline inspection system based on AR intelligent wearable equipment, and belongs to the technical field of industrial detection. The system comprises a sensing layer, a processing layer and an interaction layer, the sensing layer integrates laser projection, a flexible pressure sensor and an inertial measurement unit through a wearable glove, and pipeline data collection is achieved in combination with a millimeter wave radar, a multispectral camera and an ultrasonic thickness measurement module. The processing layer adopts a heterogeneous computing platform, dynamically distributes computing power and optimizes data processing efficiency; the interaction layer provides clear operation guidance in a complex environment through an adaptive projection engine and bone conduction feedback; the system can switch detection modes according to hand actions and automatically adjust projection parameters to adapt to different pipe diameters and illumination conditions; a distributed power supply design is adopted, a super capacitor and a lithium battery are combined, and long-time stable operation is guaranteed; according to the scheme, the inspection efficiency is improved, manual intervention is reduced, and the method is suitable for pipeline detection and maintenance in a complex industrial environment.

The invention relates to the technical field of laser projection, in particular to a dynamic laser projection marking device for mutual rescue of rail transit motor train units based on a vehicle-vehicle ad hoc network, which comprises a laser projection body, an outer sleeve box arranged outside the laser projection body, a protection mechanism arranged on the top surface in the laser projection body, and a mirror surface cleaning part. According to the dynamic laser projection marking device for mutual rescue of the rail transit motor train units based on the vehicle-vehicle ad hoc network, a baffle plate displacement end point triggers embedding of a guide block and a round hole, so that a liquid blocking plug moves downwards to conduct a cross-shaped through pipe, accurate time sequence matching of full opening of the baffle plate and spraying of cleaning liquid is achieved, a piston plate is matched, and a push plate is linked through a connecting rod; the opening action of the baffle is utilized to pressurize and supply liquid to the liquid storage tank, closed-loop control of mechanical action and cleaning start and stop is formed, the problem of response delay existing in a traditional separated system of the structure is solved, and the investment of additional pressurizing equipment is reduced.

Systems, methods, devices and non-transitory, computer-readable storage mediums are disclosed for a wearable multimedia device and cloud computing platform with an application ecosystem for processing multimedia data captured by the wearable multimedia device. In an embodiment, a body-worn apparatus comprises: a camera; a depth sensor; a laser projection system; one or more processors; memory storing instructions that when executed by the one or more processors, cause the one or more processors to perform operations comprising: capturing, using the camera, a set of digital images; identifying an object in the set of digital images; capturing, using the depth sensor, depth data; identifying a gesture of a user wearing the apparatus in the depth data; associating the object with the gesture; obtaining data associated with the object; and projecting, using the laser projection system, a laser projection of the data on a surface.

The invention discloses a laser projection light source and laser projection equipment, the laser projection light source comprises a shell, a plurality of lasers and a plurality of light combination mirror groups in one-to-one correspondence with the lasers, each light combination mirror group comprises a plurality of reflectors, the lasers are mounted at a plurality of accommodating openings in a first side wall, and the reflectors are mounted at the accommodating openings in the first side wall. A second side wall perpendicular to the first side wall is provided with a light outlet; the light-emitting surface of at least one laser comprises a first light-emitting area, a second light-emitting area and a third light-emitting area which are respectively used for emitting a first color light beam, a second color light beam and a third color light beam which are different in polarization direction, and a first wave plate is arranged between the third light-emitting area and the third reflector. The laser projection light source is used for the laser projection equipment.

The invention relates to the technical field of rock lumpiness identification, in particular to a rock lumpiness laser indicating device, which comprises L groups of laser projectors which are respectively arranged in different directions of a breaking hammer mechanical arm; the acquisition module is used for being matched with the laser projector to acquire grid deformation size data; and the central processing unit is used for obtaining the grid deformation size data and analyzing and processing the grid deformation size data to obtain a rock lumpiness index. According to the method, laser grid light is synchronously projected in multiple directions, deformation size data are acquired from different visual angles, and complementation of the visual angles in different directions can be realized, so that the problems of'dead angles' and information loss caused by mutual stacking and shielding among rocks are remarkably reduced, the coverage rate and reconstruction integrity of the whole point cloud are improved, and the reconstruction accuracy is improved. Through multi-view point cloud splicing and fusion, the obtained point cloud model is higher in integrity and richer in edge information, and subsequent fragmentation identification based on a machine learning model is facilitated.

The invention discloses a smoke alarm device and an alarm control method, and particularly relates to the technical field of fire-fighting alarm devices.The device comprises a shell, and a multi-mode sensor module is arranged in the shell and used for collecting parameters in the environment in real time and generating detection signals; the data processing unit is electrically connected with the multi-mode sensor module through an I2C bus and is used for performing multi-dimensional analysis on the detection signal and generating an alarm decision instruction; the grading alarm module is used for receiving the alarm decision instruction through a GPIO (General Purpose Input / Output) interface; wherein the grading alarm module comprises a visible light warning assembly which comprises an RGBLED array and a laser projector and is used for generating a visual alarm and escape guidance; the sound wave generating device is used for transmitting a directional frequency-adjustable sound wave signal; the wireless communication module is electrically connected with the data processing unit; the invention aims to solve the problem that a smoke alarm device in the prior art can only play a role in warning and cannot effectively guide evacuation of users.

The invention discloses a laser projection device, and relates to the technical field of illumination, and the laser projection device comprises a reflection cylinder and a laser light source. A reflecting surface is formed on the side of the reflecting cylinder; a plurality of reflecting surfaces are arranged and are planes; the laser light source is used for emitting a lighting beam, so that the lighting beam is projected to the reflecting surface; wherein the reflection cylinder can rotate around the axis of the reflection cylinder, so that the surface normal direction of the reflection surface is changed; and the reflecting surface is in a projection shape. According to the technical scheme provided by the invention, the definition of light spots can be improved.

A laser projection module includes a fixing base, a light-emitting chip and an optical element. The fixing base has a first surface and a second surface opposite each other, and the second surface is a light-emitting surface. The fixing base has a first accommodation cavity, a second accommodation cavity and a third accommodation cavity that are sequentially arranged in a direction from the first surface to the second surface and communicated to each other. The fixing base is provided with a conduction line. The light-emitting chip is disposed on the first fixing surface of the fixing base and electrically connected to one terminal of the conduction line. The optical element is disposed on the second fixing surface of the fixing base.

The invention discloses a retroreflection brightness coefficient determination method, which comprises the steps that a first image and a second image corresponding to a detected position in marking detection are acquired, the first image is an image acquired under the condition of single-wavelength laser projection, and the second image is an image acquired under the condition of single-wavelength laser non-projection; identifying a first marking area in the first image by using a given image segmentation algorithm; identifying a second marking area in the second image by using a given image segmentation algorithm; extracting a first gray value of a first marking area in the first image; extracting a second gray value of a second marking area in the second image; and according to the first gray value, the second gray value and a given retro-reflection brightness coefficient standard value, calculating the retro-reflection brightness coefficient of the marked line at the detected position. The invention further discloses a retroreflection brightness coefficient detection and evaluation device, electronic equipment and a program product.

A dual-modulation laser projection system (100) includes a polarizing beamsplitter (110) for splitting laser light (180) into first (182) and second (184) polarized beams having mutually orthogonal polarizations, a phase spatial light modulator (120) for beam steering the second polarized beam (184), a mechanical amplitude spatial light modulator (130) for amplitude modulating a combination of the first polarized beam (182) and the second polarized beam (186) as beam steered by the phase spatial light modulator (120), and a filter (140) for removing, from the combination (190) of the first and second polarized beams, one or more of a plurality of diffraction orders introduced by the mechanical amplitude spatial light modulator (130), to generate filtered, modulated output light (192).