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1463 results about "Plane mirror" patented technology

A plane mirror is a mirror with a flat (planar) reflective surface. For light rays striking a plane mirror, the angle of reflection equals the angle of incidence. The angle of the incidence is the angle between the incident ray and the surface normal (an imaginary line perpendicular to the surface). Therefore, the angle of reflection is the angle between the reflected ray and the normal and a collimated beam of light does not spread out after reflection from a plane mirror, except for diffraction effects.

Method and apparatus for using an array of grating light valves to produce multicolor optical images

A multicolor optical image-generating device comprised of an array of grating light valves (GLVs) organized to form light-modulating pixel units for spatially modulating incident rays of light. The pixel units are comprised of three subpixel components each including a plurality of elongated, equally spaced apart reflective grating elements arranged parallel to each other with their light-reflective surfaces also parallel to each other. Each subpixel component includes means for supporting the grating elements in relation to one another, and means for moving alternate elements relative to the other elements and between a first configuration wherein the component acts to reflect incident rays of light as a plane mirror, and a second configuration wherein the component diffracts the incident rays of light as they are reflected from the grating elements. The three subpixel components of each pixel unit are designed such that when red, green and blue light sources are trained on the array, colored light diffracted by particular subpixel components operating in the second configuration will be directed through a viewing aperture, and light simply reflected from particular subpixel components operating in the first configuration will not be directed through the viewing aperture.
Owner:THE BOARD OF TRUSTEES OF THE LELAND STANFORD JUNIOR UNIV

Star sensor calibrator and method for calibrating high-precision star sensor

The invention discloses a star sensor calibrator and a method for calibrating a high-precision star sensor. The star sensor calibrator has the structure that a two-dimensional adjustable plane mirror is arranged on the optical path between a single-star simulator and a star sensor to be calibrated; the position forming an included angle of 90+/-15 degrees with the two-dimensional adjustable plane mirror is provided with a laser device of a laser angle measuring device; the position 50-200 cm away from the center of the two-dimensional adjustable plane mirror is provided with a high-precision two-dimensional guide rail which can vertically and horizontally move on an optical hover platform; a laser detector of the laser angle measuring device is installed on the high-precision two-dimensional guide rail; after being reflected by the two-dimensional adjustable plane mirror, the laser emitted by the laser device is incident into the laser detector; and a data processing computer is respectively communicated with the star sensor to be calibrated and the laser detector. The invention does not need to rotate the star sensor, increases the tangential distortion and the deflection angle of the installation error, and can meet the requirements for very-high-precision (sub-arcsec) star sensors. The invention has the advantages of simple method and small amount of calculation.
Owner:NAT UNIV OF DEFENSE TECH

High-precision laser photocuring 3D (three dimensional) printer

The invention relates to a high-precision laser photocuring 3D (three dimensional) printer. The high-precision laser photocuring 3D printer comprises a shell and a pedestal. The high-precision laser photocuring 3D printer has the beneficial effects that one end of a high-precision ball screw is connected with a servo motor, the control precision of the servo motor is guaranteed by a rotary encoder at the rear end of a motor shaft and is accurate, and the high-precision laser photocuring 3D printer utilizes the servo motor, so that the printer is stable, and the energy consumption is reduced; as the ball screw has the characteristics of high positioning precision, small friction force, high rigidity and strong load capacity, the molding precision of the printer is high; a circuit control module is connected with a touch screen and a power supply switch respectively through data wires to intelligently control the printer, so that the control precision and processing efficiency are increased; a digital projection device comprises a digital projector horizontally fixed on the upper side of the pedestal, and a plane mirror, so that the structure of the printer is compact; the digital projection device comprises an ultraviolet source and a focusing lens, and the focusing lens is arranged above the ultraviolet source, so that the realizing theory is simple, and the cost performance is high.
Owner:RUIAN MAITIAN NETWORK TECH

Measurement mechanism of lens focal length, measurement method and thereof and optical quality evaluation method

InactiveCN101140196APrecision Measuring Focal LengthPrecise measurement of depth of focusTesting optical propertiesMeasurement deviceLong-focus lens
The invention relates to a device and a method for measuring lens focal length as well as a method for evaluating optical quality, wherein the device for measuring the lens focal length is composed of a plane mirror, a lens to be measured, a point light source, a vertical incision, a one-dimensional precise flat movable guide rail, a laser distance measuring instrument, a CCD detector and a display, and the method for measuring the lens focal length is as follows: (1) adjusting the autocollimation of the point light source and the lens to be measured; (2) adjusting the plane mirror to make the transflective convergent beam enter the CCD detector; (3) measuring the focal depth of the lens to be measured; (4) measuring the distance L from the point light source to the geometric main plane of the lens to be measured; (5) calculating the focal length f = L + d of the lens to be measured, and the d is the distance between the geometric main plane of the lens and the optical main plane. The optical processing quality of the lens to be measured is qualitatively evaluated through the observation of shape of the far-field focal spot. The device and the method are applied to the measurement and evaluation of the small-bore short-focus and large-bore long-focus lens, and have the advantages of the intuitionism, the high measuring precision and the simple mechanism.
Owner:SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI

Device and method of measuring surface topographies of mirror and mirror-like objects

The invention discloses a method and a device for measuring surface topographies of mirror and mirror-like objects. Phase measurement deflectometry is adopted to measure mirror and mirror-like surface shapes, a combination between a liquid crystal display and a planar mirror serves as a calibration plate, the liquid crystal display is fixed and can not move, the planar mirror moves freely for four times, an image reflected by the planar mirror is photographed by a CCD detector, linear solution and beam method adjustment are then used for completing calibration on inner parameters of the camera, global pose estimation is used for completing calibration on the relative relation between the liquid crystal display and the camera, and finally, a three-dimensional topography of a to-be-detected mirror surface is calculated and obtained through a gradient integral of the phase measurement deflectometry. According to the device and the method of the invention, defects that the calibration plate is needed and a precise positioning control point is attached to the planer mirror during the calibration process in the traditional method are overcome, the measurement cost is low, and he measurement speed is quick; and constraint conditions such as rotation matrix orthogonality during a perspective imaging process and a fourier transform method are introduced for corresponding point matching, and influences by high noise and multiframe processing on three-dimensional topography recovery can be overcome.
Owner:TSINGHUA UNIV

Sweeping robot and walking control method for same

The invention provides a sweeping robot and a walking control method for the same. The method comprises the following steps of: mounting a plane mirror on a wall of a room to be swept, wherein a vertical non-reflective surface is arranged in the center of the plane mirror; the normal direction of the non-reflective surface is the positive direction of an X axis; a horizontal direction parallel to the plane mirror is the direction of a Y axis; and the central point of the vertical non-reflective surface is the original point of the X axis and the Y axis; calibrating the walking direction of the sweeping robot and the position of the original point according to the change of reflected laser which is transmitted to the plane mirror by a laser transmitter and received by a photoelectric conversion receiving head; calculating the walking distance of the sweeping robot in the X and Y directions by using a control module of the sweeping robot and positioning the sweeping robot on an indoor ground; and according to the positioning in a walking process, recording swept areas and identifying un-swept areas to finish the full sweeping of the indoor ground. The sweeping robot and the walking control method can realize a high-efficiency cleaning task and have a low cost.
Owner:厦门朴蜂智能科技有限公司

Device for detecting wave front of large-aperture optical system

The invention relates to a device for detecting the wave front of a large-aperture optical system. The device comprises an interferometer, a five-dimensional adjustment platform, a numerical-control turntable, a numerical-control electric displacement platform, a self-collimation standard plane mirror, a two-dimensional adjustment rack and a computer control and data processing system. The device is characterized in that: the wave front of the large-aperture optical system is divided into a plurality of sub-aperture wave fronts, the interferometer and the self-collimation standard plane mirror detect the sub-aperture wave fronts of the large-aperture optical system, the numerical-control turntable and the numerical-control electric displacement platform control the standard plane mirror to move so as to scan the sub-aperture wave fronts, the interferometer detects and records the sub-aperture wave fronts, so that the detected sub-aperture wave fronts cover the whole large-aperture optical system; and the computer control and data processing system stitches the sub-aperture wave fronts through algorithms, so that the full-aperture wave front of the large-aperture optical system is obtained, and the detection on the wave front of the large-aperture optical system is finished. The device has the advantages of simple structure, low cost and capability of detecting the image quality of the wave front of a large-aperture optical system with the aperture of not less than 1000 mm.
Owner:INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI

Systematic geometric demarcation method for reflection three-dimensional measurement of stripe

The invention discloses a systematic geometric demarcation method for reflection three-dimensional measurement of a stripe, and relates to systematic geometric demarcation during the three-dimensional appearance measurement of an object with a mirror reflection characteristic. As a stripe display device appears in a viewing field range of a video camera indirectly, the conventional systematic geometric demarcation process is fulfilled by adopting a method of sticking a marking point on a plane mirror. However, the physical coordinates of the marking point are required to be pre-measured through other precision measurement means. To solve the problem, the systematic geometric demarcation method adopts the scheme that the operation of sticking the marking point on the plane mirror is eliminated, the stripe on the stripe display device is reflected three times by the plane mirror, and analysis and linear calculation are conducted on the coordinates of the characteristic point and the imaging point of the stripe, so that the original value evaluation of the systematic geometric demarcation process is fulfilled; and then the evaluation result is optimized by adopting bundle adjustment, so as to obtain the final systematic geometric demarcation result. The systematic geometric demarcation method has the advantages of simplicity and flexibility; and only a plane mirror with a proper size is required for fulfilling the systematic geometric demarcation of the reflection three-dimensional measurement of the stripe. The systematic geometric demarcation method provides an efficient systematic demarcation way for phase position measurement deflection methods, stripe reflection photogrammetric survey and like which are based on stripe reflection three-dimensional measuring methods, thereby having a wide application prospect.
Owner:SICHUAN UNIV

Single-pixel terahertz holographic imaging device and method

The invention discloses a single-pixel terahertz holographic imaging device and method. Monochromatic terahertz light emitted by a terahertz laser source is transformed into parallel light with larger beamwidth by a beam expander device, and then divided into object light and reference light through a beam splitter; the object light is encoded by a modulation device in airspace after irradiating an object; the reference light passes through an adjustable phase shifter on the light path after being reflected by a plane mirror; the object light is converged with the reference light on a second beam splitter after being reflected by the plane mirror, enters a single-pixel detector at the focus point of a condenser lens after being converged by the condenser lens; a signal output by the single-pixel detector is fed to a control module to carry out image reconstruction; and terahertz holographic compression sensing imaging of the object is achieved by changing combination of a space code on the modulation device and a phase on the adjustable phase shifter for a plurality of times. The single-pixel terahertz holographic imaging device and method have the advantages that real three-dimensional imaging of the tested object is achieved by combining phase-shifting digital holography with a compression sensing principle, and the single-pixel terahertz holographic imaging device and method are pioneering inventions in the field of terahertz imaging.
Owner:博微太赫兹信息科技有限公司

Non-scanning 3D imaging laser radar optical system based on APD array

A non-scanning 3D imaging laser radar optical system based on an APD array is arranged in a shell of a laser radar system. The non-scanning 3D imaging laser radar optical system is composed of a laser, a Galilean telescope, an optical splitter, an emitting optical unit consisting of an emitting-receiving spectroscope and an emitting lens with the focal length of f1 and a receiving optical unit consisting of a receiving lens with the focal length of f2 and the emitting-receiving spectroscope; the inner wall of the tail part of the shell of the laser radar system is provided with the laser, the Galilean telescope is arranged in front of the laser, the optical splitter is arranged in front of the Galilean telescope, the emitting-receiving spectroscope is arranged in front of the optical splitter, is a plane mirror with a hole provided at the center thereof, is positioned between a light spot and the receiving lens with the focal length of f1 and placed at 45 degrees to an optical axis, a port on the shell of the laser radar system is provided with the receiving lens with the focal length of f2, the emitting lens is positioned in the hole at the center of the receiving lens, and the emitting-receiving spectroscope reflects beams at 90 degrees to a detector at a focal plane position of the receiving lens. The optical system has simple structure and high accuracy, and can be applicable to the fields of plotting, navigation and astronautics.
Owner:BEIHANG UNIV

A structured light parameter calibrating apparatus and method based on a front-film-plated plane mirror

The invention discloses a structured light parameter calibrating apparatus and method based on a front-film-plated plane mirror. The method comprises the following steps: a front-film-plated plane mirror and a plane glass target are placed in front of a camera; the camera simultaneously shoots the image of the plane glass target and a mirror image of the plane glass target; a virtual binocular measurement model is established; optimal solutions of a rotation matrix from a front-film-plated plane mirror coordinate system to a camera coordinate system and a translation vector are obtained by a nonlinear optimization method; image vanishing point solving is carried out on optional feature points by the least squares method; white printing paper is placed in front of the front-film-plated plane mirror, and the camera takes the actual light bar image and the mirror image light bar image; and the center point of the light bar image is extracted to calculate the three-dimensional coordinates of matching points to solve an optical plane equation. According to the invention, the light bar quality is improved and the light bar center extraction precision is raised; feature points with the position precision of the micron order are provided to obtain more calibration points; higher calibration precision is realized; and the calibration result is more stable.
Owner:BEIHANG UNIV

High-collimation solar simulator optical system with auto-collimation aiming system

InactiveCN101907773AAccurate zero calibrationEliminate human influenceIndividual semiconductor device testingOptical elementsEyepiecePlane mirror
The invention relates to a high-collimation solar simulator optical system with an auto-collimation aiming system, belonging to a solar simulator optical system in the technical field of optics design and aiming at solving the technical problem of providing a high-collimation solar simulator optical system with the auto-collimation aiming system. The high-collimation solar simulator optical system with the auto-collimation aiming system comprises a xenon lamp source, an ellipsoid condenser, a plane mirror, an optics integrator assembly, a first dispersion prism, a second dispersion prism, an emission reticle, an LED light source, an aiming reticle, an ocular lens and a collimator objective. On the basis of the traditional high-collimation solar simulator optical system, an auto-collimation aiming system is added on an optical path of the optical integrator assembly, wherein the auto-collimation optical system comprises a first dispersion prism, a second dispersion prism, an emission reticle, an LED light source, an aiming reticle and an ocular lens. The invention can ensure more accurate zero calibration so as to eliminate the man-made influence and achieve better experimental effect.
Owner:CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI

Single-frequency laser interferometer non-linear error compensation device

ActiveCN106225667ACompensate for phase non-orthogonality errorCompensate for non-linear errorsUsing optical meansGrismPlane mirror
The present invention discloses a single-frequency laser interferometer non-linear error compensation device. The single-frequency laser interferometer non-linear error compensation device is characterized in that after a light beam emitted by a laser is split by a polarization splitting prism, the transmitted light is projected to a rectangular prism and is returned to the polarization splitting prism to form the reference light S; the reflected light is projected to a plane mirror and is returned to the polarization splitting prism to form the measurement light P; a linear polaroid along an S direction is placed in a reference light path, and a linear polaroid along a P direction is arranged in a measurement light path, thereby realizing the nonorthogonal error compensation; the semi-transparent and semi-reflective mirrors are arranged in the emergent light paths of the linear polaroids, so that the reference light and the measurement light are combined and then are split by a depolarization splitting prism evenly, the transmitted light generates the interference signals I1 and I2 via a quarter-wave plate and the polarization splitting prism, the reflected light generates the interference signals I3 and I4 via the polarization splitting prism, and the mutual phase difference of the signals I1, I2, I3 and I4 is 90 degrees. According to the present invention, a non-linear error of the single-frequency laser interferometer is compensated effectively.
Owner:HEFEI UNIV OF TECH

Two-dimensional photoelectric auto-collimation method and device of polarized light plane mirror reference common-path compensation

InactiveCN102176086AAccurately reflect the amount of driftSame characteristicsUsing optical meansOptical elementsBeam splitterPlane mirror
The invention discloses a two-dimensional photoelectric auto-collimation method and device of polarized light plane mirror reference common-path compensation, and the method and device provided by the invention belong to the technical field of precision instrument manufacture and precision measurement. According to the invention, high-precision photoelectric autocollimation angle measurement is realized for solving the defects in the existing method and device. The method comprises: a plane mirror reference common-path shift quantity monitoring separating device can be used for separating a reference light beam with the feature identical to the that of a measurement light beam, especially the reference light beam which is in the common-path transmission with the measurement light beam, while obtaining measurement light beam in a two-dimensional angle variation by using the polarization feature of the laser and using a polarizing beam splitter and a reference plane reflector; and a controller can be used for controlling a two-dimensional light beam deflection device in real time according to the shift quantity reflected by the reference light beam so as to inhibit the shift quantity coupled in the measurement light beam, thus the precision measurement on the two-dimensional angle variation is realized. The device for realizing the method comprises a two-dimensional photoelectric auto-collimation tube, the plane mirror reference common-path shift quantity monitoring separating device, the controller and the two-dimensional light beam deflection device.
Owner:HARBIN INST OF TECH
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