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32 results about "Wavefront curvature" patented technology

Method and apparatus for measuring optical aberrations of the human eye

InactiveUS20020047992A1Measure quickly and accuratelyQuickly and accurately measuringRefractometersSkiascopesLight spotImage detection
An apparatus for measuring optical aberrations of the human eye wherein the person positions his or her eye on an optical axis of the apparatus and looks at an illuminated target on the optical axis that is visible to the eye for allowing the eye to focus on the target and establish a position of the eye. A collimating lens on the optical axis is movable along the optical axis for adjusting the apparent optical distance between the eye and the target. A light source directs a predetermined light beam along the optical axis into the eye and onto the retina of the eye as a spot of light. A lens reimages the light scattered from the light spot on the eye retina into a wavefront curvature sensor that forms two oppositely defocused images on an image detector, and a computer processes and analyzes the two defocused images for measuring the optical aberrations of the eye.
Owner:AOPTIX TECH

Apparatus for displaying image by projection on retina of viewer with eliminated adverse effect of intervening optics

An apparatus for use in image display, of projecting a light beam onto a retina of a viewer, to thereby allow the viewer to perceive an image, is disclosed. The apparatus is constructed to include: a light emitter emitting a light beam; a scanner scanning the light beam emitted by the light emitter; an optical system receiving the light beam scanned by the scanner as an incoming light beam, and emitting the received incoming light beam as an outgoing light beam, such that, upon modulation of the light beam with respect to a traveling direction of the light beam, the outgoing light beam is directed to a pupil of the viewer; and a curvature compensator compensating a wavefront curvature of the incoming light beam.
Owner:BROTHER KOGYO KK

Display device

A display device (1) has a photon source (20) that displays an image scene in which the user perceives points at differents distances, resulting in optical stimulation of the eye's accommodative response. This is achieved by an intermediate optical system (21) forming the photons into pencils and a variable power optical system (22) positioned for convergence of the pencils. A control system (8) controls the variable power optical system (22) to modulate photon wavefront curvature according to image pixel co-ordinate and intensity data and data representing required perceived pixel distance.
Owner:SHEVLIN TECH

Image display apparatus and signal processing apparatus

An apparatus is disclosed for displaying to a viewer an image stereoscopically representing a three-dimensional object to be displayed. The apparatus includes: an emitter emitting light, having an intensity modulating section capable of intensity modulation for modulating an intensity of the light emitted from the emitter; a wavefront-curvature modulator capable of wavefront-curvature modulation for modulating a curvature of wavefront of the light emitted from the emitter; and a controller controlling the intensity modulation and the wavefront-curvature modulation, based on a luminance signal indicative of luminance of the image, and a depth signal indicative of depth of the image. The depth signal is a signal corresponding to depth data produced in a rendering process for the object to be displayed.
Owner:BROTHER KOGYO KK

A dynamic three-dimensional microscopic observation device for biological living cells based on digital holography

The invention discloses a digital holography-based three-dimensional micro-observation apparatus for cell dynamic of a living organism. According to the apparatus provided in the invention, a microscopic technology of digital holography is employed, so that dynamic three-dimensional microscopic observation without contact, damage and pretreatment on a cell of a living organism can be realized; a fiber optical path is utilized to realize object light illumination and an optical path portion of the object light employs a vertical type structure, so that it is convenient to carry out observationon the cell of the living organism; reference light utilizes a light beam turnover device to control an included angle between the reference light and the object light so as to realize off-axis digitholography; and an infinite distance correction microscopic object lens is employed to carry out pre-amplification and imaging on the cell; simultaneously, a relay lens is utilized to adjust an imaging position and a wavefront curvature of the object light, so that observation resolution is improved. According to the apparatus, layout structures of a plurality of optical elements are compact, flexible and stable thorough a platform; moreover, the apparatus can be applied to dynamic observation on the cell of the living organism for a long time.
Owner:BEIHANG UNIV

Ocular metrology employing spectral wavefront analysis of reflected light

ActiveUS20160135679A1Balanced detectionReduce artefactSpectales/gogglesOptical measurementsMetrologyNear sightedness
Method and systems are presented for analysing a wavefront using a spectral wavefront analyser to extract optical phase and spectral information at a two dimensional array of sampling points across the wavefront, wherein the relative phase information between the sampling points is maintained. Methods and systems are also presented for measuring an eye by reflecting a wavefront of an eye and measuring the wavefront at a plurality of angles to provide a map of the off-axis relative wavefront curvature and aberration of the eye. The phase accuracy between wavelengths and sample points over a beam aperture offered by these methods and systems have a number of ocular applications including corneal and anterior eye tomography, high resolution retinal imaging, and wavefront analysis as a function of probe beam incident angle for determining myopia progression and for designing and testing lenses for correcting myopia.
Owner:CYLITE

Flight path-driven mitigation of wavefront curvature effects in SAR images

A wavefront curvature effect associated with a complex image produced by a synthetic aperture radar (SAR) can be mitigated based on which of a plurality of possible flight paths is taken by the SAR when capturing the image. The mitigation can be performed differently for different ones of the flight paths.
Owner:NAT TECH & ENG SOLUTIONS OF SANDIA LLC

Method and apparatus for recording an optical grating in a photosensitive medium

InactiveUS6501883B1Versatile and commercially practicalImprove efficiencyCladded optical fibreDiffraction gratingsGratingLight beam
A method and an apparatus for recording optical gratings in a photosensitive medium are provided. The invention uses a phase mask in combination with a scanning of the recording light beam. The phase mask, or alternatively the photosensitive medium, is translated along a direction parallel to the scanning of the light beam, so that the period of the recorded grating may be locally adjusted. To ensure a proper recording efficiency over a large range, an appropriately selected wavefront curvature is provided in the light beam. The method of the invention is particularly advantageous for the recording of superimposed grating components in a photosensitive medium.
Owner:TERAXION

Display device

A display device (1) has a photon source (20) that displays an image scene in which the user perceives points at differents distances, resulting in optical stimulation of the eye's accommodative response. This is achieved by an intermediate optical system (21) forming the photons into pencils and a variable power optical system (22) positioned for convergence of the pencils. A control system (8) controls the variable power optical system (22) to modulate photon wavefront curvature according to image pixel co-ordinate and intensity data and data representing required perceived pixel distance.
Owner:SHEVLIN TECH

Retinal image display device

A retinal image scanning device is provided with at least one light source that emits a light beam, an intensity modulating system that modulates the intensity of the light beam emitted by said at least one light source in accordance with a video signal, an optical system that directs the light beam to a pupil of an observer, a scanning system that scans the light beam in a first direction and in a second direction which is substantially perpendicular to the first direction so that a two-dimensional image frame defined by the first and second directions is formed on a retinal of the observer, and a wavefront curvature modulating system that modulates a wavefront curvature of the light beam when the light beam is scanned in at least one of the first direction and the second direction.
Owner:BROTHER KOGYO KK

Image display apparatus and signal processing apparatus

An apparatus is disclosed for displaying to a viewer an image stereoscopically representing a three-dimensional object to be displayed. The apparatus includes: an emitter emitting light, having an intensity modulating section capable of intensity modulation for modulating an intensity of the light emitted from the emitter; a wavefront-curvature modulator capable of wavefront-curvature modulation for modulating a curvature of wavefront of the light emitted from the emitter; and a controller controlling the intensity modulation and the wavefront-curvature modulation, based on a luminance signal indicative of luminance of the image, and a depth signal indicative of depth of the image. The depth signal is a signal corresponding to depth data produced in a rendering process for the object to be displayed.
Owner:BROTHER KOGYO KK

Increase spatial sampling for wave front mid-spatial frequency error recovery

A differential curvature sensing device for measuring a wavefront curvature by employing increased spatial sampling for wavefront testing with mid-frequency error recovery. The device includes a sampling sensor having an output beam, an optical element to split said output beam, a lenslet array in the path of each beam to generate corresponding sampling grids, a shearing element for shifting the grid points in horizontal and vertical directions to produce plural sampling grids having plural grid points for use generating a spatial sampling grid having a density for mid-spatial frequency recovery. The displacement of the shifting less than a pitch size of the lenslet array, and a measuring device measuring plural slopes of plural wavefronts at each grid point to obtain a wavefront normal curvature and corresponding twist curvature terms to determine a principal curvature and directions. The sensor is a Shack-Hartman sensor, shearing interferometer sensor and other discrete-point sampling sensors.
Owner:UNIV OF CENT FLORIDA RES FOUND INC

Atmospheric optical data transmission system

A free-space optical data transmission system, comprised of first and second transceivers spaced a substantial distance from each other and having telescopes aimed at each other. Each transceiver has a light transmitter for transmitting data-encoded light from its telescope to the other telescope, and a light receiver for receiving the data-encoded light from the other telescope. Each transceiver has a wavefront sensor for determining the curvature of the wavefront of light transmitted between the telescopes, which light wavefront may be distorted by atmospheric aberrations, a deformable curvature mirror operably connected to the wavefront sensor and positioned in the path of the data-encoded light for modifying the wavefront curvature of the data-encoded light in response to the wavefront curvature determined by the wavefront sensor. Preferably, each transceiver has an arrangement for distinguishing / separating the transmitted and received light waves for bi-directional data transmission.
Owner:AOPTIX TECH

Wavefront characterization and correction

ActiveUS8009280B1Easy constructionComputationally less-intensiveOptical measurementsPhotometryGratingEngineering
A system, for determining characteristics of a beam wavefront and reshaping such wavefront, including: apparatus for sampling the wavefront curvature and generating outputs; apparatus for reshaping the wavefront; and apparatus for receiving the outputs, proportioning the outputs to match the inputs need to drive controls for the reshaping apparatus, and sending the proportioned outputs to the reshaping apparatus. The reshaping apparatus is, preferably, a deformable mirror. The sampling apparatus includes a distorted grating. The method includes: positioning the sampling apparatus in the bean path; positioning a reshaping apparatus in the beam path; sampling the curvature of the wavefront and generating outputs representative of the curvature thereof; sending the generated outputs to the proportioning apparatus; proportioning the outputs to match the inputs needed to drive the controls of the reshaping apparatus; and sending the proportioned outputs to the reshaping apparatus to change the shape thereof.
Owner:KESTREL CORP

Method for optimizing stacking parameters of seismic common reflection surface

The invention provides a method for optimizing the stacking parameters of a seismic common reflection surface, which includes the following steps: S1, acquiring seismic data, and acquiring the wavefront curvature radius of an initial reflection point and the wavefront curvature radius and inclination angle of an initial reflection surface based on the seismic data; and S2, acquiring the optimal values of the wavefront curvature radius of the initial reflection point and the wavefront curvature radius and inclination angle of the initial reflection surface according to the wavefront curvature radius of the initial reflection point and the wavefront curvature radius and inclination angle of the initial reflection surface and based on an objective function. The invention provides a method foroptimizing the stacking parameters of a seismic common reflection surface. In the first step, three initial parameters are found, the initial parameters are searched one by one, and simple linear search can be used. In the second step, an optimal combination solution is searched near the initial parameters by using a global optimization algorithm. Thus, the problem on how to fast scan the CRS imaging parameters by a CMAES algorithm is solved.
Owner:SOUTHWEST PETROLEUM UNIV

Spherical wavefront curvature radius measuring device and measuring method

ActiveCN114322848AOvercoming unmeasurable deficienciesAchieve recoveryUsing optical meansICT adaptationLight beamErbium lasers
The invention discloses a spherical wavefront curvature radius measuring device which comprises an initial wavefront adjusting module, a spherical wave generating module and a radial shearing interference module. The spherical wave generation module comprises a transmission-type spherical wave generation module and a reflection-type spherical wave generation module; coupled beams are output from a laser, the coupled beams are used as initial input wavefronts for generating two different types of spherical waves, and the initial wavefronts are adjusted by an initial wavefront adjustment module and then enter a transmission-type spherical wave generation module and a reflection-type spherical wave generation module respectively; initial input wavefront deforms correspondingly after passing through the transmission type spherical wave generation module and the reflection type spherical wave generation module and then is transmitted to the radial shearing interference module, final output wavefront is received by the polarization camera, and curvature radius measurement is achieved according to obtained original spherical wavefront distribution. The invention further discloses a method for measuring the curvature radius of the spherical wavefront, and the method has the advantages that large-curvature spherical wavefront recovery is achieved, the method is not affected by vibration operation, and efficient data dynamic collection is achieved.
Owner:CHINA UNIV OF PETROLEUM (EAST CHINA)

Tunable achromatizing optical apparatus, methods, and applications

A tunable, achromatizing optical system for use with a broadband imaging modality system for imaging objects having a range of longitudinal chromatic aberration (LCA) values. The optical system includes an achromatizing component and a parfocal component, for example, a zoom system. A method for tuning the wavefront curvature of different chromatic components of objects having a range of longitudinal chromatic aberration (LCA) values when imaged by a broadband imaging modality system includes the steps of providing a broadband imaging modality system having an entrance pupil, for imaging an object having longitudinal chromatic aberration; providing a tunable, achromatizing optical system; and varying the focal length of the parfocal component while maintaining a conjugate relationship between the achromatizing component and the entrance pupil of the broadband imaging modality system.
Owner:UNIVERSITY OF ROCHESTER

Large-field-of-view survey telescope wavefront curvature sensing method, device and equipment, and medium

The invention discloses a large-field-of-view survey telescope wavefront curvature sensing method, device and equipment, and a medium. The large-field-of-view survey telescope wavefront curvature sensing method comprises the steps of: carrying out coarse alignment on a large-caliber main focus assembly, and carrying out imaging through using staggered curvature sensors located at two sides of a focal plane to obtain an out-of-focus star point graph; acquiring the boundary of the out-of-focus star point graph, and segmenting the out-of-focus star point graph into a plurality of sub-aperture regions, wherein each sub-aperture region is divided into a pure internal region without a boundary and a boundary-containing region; in the pure internal regions, solving wavefront curvatures corresponding to the pure internal regions; in the boundary-containing regions, solving the wavefront curvatures and the wavefront slopes corresponding to the boundary-containing regions, and estimating the parameters of the constrained wavefront slopes by using the maximum likelihood; and carrying out comprehensive arrangement and analysis on the solved wavefront curvatures and the constrained wavefront slopes to obtain wavefront phase information of the telescope. In this way, the finally solved wavefront sensing result is more accurate, the correction time is shortened, and the correction precision is improved.
Owner:CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI

Curvature wavefront sensor based on digital micromirror device

InactiveCN102628713ASolve the problem of acquiring two out-of-focus plane imagesAvoid aberrationsOptical measurementsOptical elementsWavefront sensorDetector array
The invention relates to a curvature wavefront sensor based on a digital micromirror device. A digital micromirror device is placed between a lens and the focal plane position of the lens, the digital micromirror device is utilized to reflect light wave passing through the lens in two directions to focus light wave, two photoelectric detector arrays are respectively located on two beams of reflection focus light wave in the two directions of the digital micromirror device and respectively detect far field light intensity distribution images of the two beams of reflection focus light wave at different places to obtain two far field light intensity distribution images which are different on a symmetrical out-of-focus face around a focal plane. Relation between light intensity distribution difference normalization of corresponding points on the two out-of-focus faces, incident wavefront curvature and normal curvature of wavefront at the edge of pupil can be obtained according to the fresnel diffraction theory and approximation in geometric optics, and the poisson equation can be utilized to obtain wavefront phase of wavefront to be measured.
Owner:江苏明德之星激光显示科技有限公司

Endoscope optical system, endoscope and endoscope system

The invention provides an endoscope optical system, an endoscope and an endoscope system. The endoscope optical system comprises a diaphragm and a lens assembly, wherein a target lens exists in the lens assembly, and the target surface of the target lens is plated with a filter film layer; and the difference between the curvature of the target surface and the incident wavefront curvature of main light rays of each view field of the target surface is within a set curvature range, so that the incident angle of the main light rays of each view field on the target surface of the target lens is smaller than or equal to a set angle. According to the endoscope optical system, adverse effects caused by wavelength drift are effectively eliminated or reduced, and besides, use of an optical filter is reduced, so that the endoscope optical system is simple in structure and low in cost when wavelength drift is reduced.
Owner:SONOSCAPE MEDICAL CORP

A MEMS Piezoelectric Sensor for Measuring the Curvature of Microscale Charge Detonation Wave Front

A MEMS piezoelectric sensor for measuring the curvature of the detonation wave front of a micro-scale charge, including a base, on which a lower output electrode and a lower pad are sputtered, and the lower output electrode and the lower pad are connected by a lower wire to form a lower layer Output layer; the lower output layer is spin-coated and cured to form a PVDF-TrFE film layer, and the PVDF-TrFE film layer is polarized in a silicon oil bath, and the PVDF-TrFE sensitive element is obtained by ion etching to form a PVDF-TrFE piezoelectric layer; PVDF ‑TrFE piezoelectric layer is sputtered with an upper output electrode and an upper pad, and the upper output electrode and the upper pad are connected by an upper wire to form an upper output layer; the lower and upper output electrodes are arranged in an axially aligned manner; the lower, The upper layer pad adopts the vertical layout method connected by the lower layer wire and the upper layer wire; the upper layer output layer is coated with a protective layer; the sensor has the characteristics of small size of sensitive element, high precision, multi-point acquisition, etc., and is suitable for various test conditions Measurement of curvature of detonation wave fronts under microscale charges.
Owner:XI AN JIAOTONG UNIV

Digital holography-based three-dimensional micro-observation apparatus for cell dynamic of living organism

The invention discloses a digital holography-based three-dimensional micro-observation apparatus for cell dynamic of a living organism. According to the apparatus provided in the invention, a microscopic technology of digital holography is employed, so that dynamic three-dimensional microscopic observation without contact, damage and pretreatment on a cell of a living organism can be realized; a fiber optical path is utilized to realize object light illumination and an optical path portion of the object light employs a vertical type structure, so that it is convenient to carry out observationon the cell of the living organism; reference light utilizes a light beam turnover device to control an included angle between the reference light and the object light so as to realize off-axis digitholography; and an infinite distance correction microscopic object lens is employed to carry out pre-amplification and imaging on the cell; simultaneously, a relay lens is utilized to adjust an imaging position and a wavefront curvature of the object light, so that observation resolution is improved. According to the apparatus, layout structures of a plurality of optical elements are compact, flexible and stable thorough a platform; moreover, the apparatus can be applied to dynamic observation on the cell of the living organism for a long time.
Owner:BEIHANG UNIV

Multi-Channel Optical System

A multi channel beamsplitter system operating over a wide spectral band has high optical performance despite the fact that the incoming and / or exiting light is not collimated and its material is dispersive. This is achieved using wavefront compensators that are matched to the curvature of the wavefronts of the incoming and / or exiting light.
Owner:CHARLES STARK DRAPER LABORATORY

Pumping method for laser equipment

Laser equipment in which pumping every dependence of output beam diameter and beam wavefront curvature is reduced. The total pumping energy of at least one of laser active media disposed beyond terminal laser beam waists, among beam waists, is approximately one-half of the total pumping energy of laser active media disposed between two adjacent beam waists.
Owner:MITSUBISHI ELECTRIC CORP

Wavefront curvature sensing method and device for cruising telescope, equipment and medium

The invention discloses a wavefront curvature sensing method and device for a cruising telescope, equipment and a medium, and the method comprises the steps: carrying out the coarse alignment of a large-caliber main focus assembly, and imaging through two staggered sensors located at two sides of a focal plane; when the obtained two defocused star point images corresponding to the double natural guide stars are overlapped, simulating to obtain a light intensity distribution diagram of the two defocused star point images; taking the light intensity distribution diagram of the two defocused starpoint images obtained by simulation as a judgment basis, selecting one defocused star point image and discarding the other defocused star point image, or converting the two defocused star point images into a complete defocused star point image; and obtaining wavefront information of the telescope according to the selected defocused star point image or the light intensity distribution of the complete defocused star point image obtained by conversion. Through the method, the correction capability of curvature sensing can be improved, the finally obtained wavefront sensing result is more accurate, the observation precision of the telescope in the deep space field is improved, and the actual requirements are met.
Owner:CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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