A configurable integrated spectral, color and image-quality tester system including a first optical channel including a first light path for the traversal of a first band of electromagnetic waves, a second optical channel including a second light path for the traversal of a second band of electromagnetic waves, a dichroic beam combiner for combining the first light path and the second light path to form a third light path, a spectral filter interposed between the first optical channel and the dichroic beam combiner for modifying the first band of electromagnetic waves prior to arriving at the dichroic beam combiner, and a third optical channel for receiving the third light path, the third optical channel including a homogenizing module for homogenizing electromagnetic waves, wherein the first band of electromagnetic waves and the second band of electromagnetic waves are together disposed at wavelengths falling in a range of about 200-2500 nm.
A method for verifying alignment of image sensors of a CCD camera, the method including casting a collimated light source through an LCOS controlled to be disposed in a first pattern, onto the image sensors to form a second pattern on each of the image sensors, the LCOS disposed between a collimated light source and the CCD camera, frame-differencing the first pattern with the second pattern of each of the image sensors to result in a differencing result for each of the image sensors, and adjusting at least one of an orientation and a position of one of the image sensors if the differencing result for the one of the image sensors is non-zero, to result in an optical mapping of pixel cells of the LCOS and pixel cells of each of the image sensors.
An apparatus for indicating a misalignment of an optical axis of a lens system including a lens, a front end and a rear end, the lens having a front surface and a rear surface, the apparatus including a light source, a first mirror, a first beam splitter, and an image plane, wherein a laser beam of the light source is configured to be directed at the first beam splitter to result in a first and a second beam, the first beam is redirected at the first mirror before being redirected by the first mirror through the first beam splitter to cast a first spot at the image plane, and the second beam is disposed through the first beam splitter to be directed at the front surface of the lens system before being redirected by the first beam splitter to cast a second spot at the image plane.
G01B 11/27 - Measuring arrangements characterised by the use of optical techniques for measuring angles or tapersMeasuring arrangements characterised by the use of optical techniques for testing the alignment of axes for testing the alignment of axes
A system for determining dental caries in a patient's tooth, the system including a dental tray including a curved channel configured to be placed on the patient's teeth on the patient's lower jaw or below the patient's teeth on the patient's upper jaw, the channel includes a length, two side walls and a middle wall connecting the two side walls, and a U-shaped excitation-detection transducer defined by two side portions and a middle portion connecting the two side portions, the transducer configured to be supported on and slidingly coupled with the channel with a shape of the transducer conforming to a cross-sectional periphery of the channel, the transducer selectively positioned over a portion of the channel over the patient's tooth, wherein the transducer is used to excite surface acoustic waves (SAWs) in the tooth and to receive SAWs in the patient's tooth.
An optical system for measuring a parallelism of rays of a light emitter and virtual imaging distances (VIDs) of the light emitter, the optical system including an enclosure, a pair of apertures, and a lens system disposed between the front and rear end of the enclosure, wherein a first and second of the apertures allows a first and second set of rays into the enclosure to be disposed through the optical lens system to be cast on an imaging plane as a first and second spot, respectively, wherein a parallelism of the sets of rays is based on a correspondence of a distance between the spots with a distance between sets of rays and a VID of the light emitter is based at least in part on an offset of the imaging plane from the lens system focus position when the light emitter is not optically disposed at infinity.
A wavefront tester for measuring the wavefront of a sample via an optical path, the wavefront tester including a mirror, an imaging lens, an aperture, a beam splitter, a wavefront sensor, a lens selection system including a plurality of optical lenses, a suitable optical lens of which is commensurate with the sample and selected to be disposed in the optical path and a light source directed in a first direction through the optical path by the beam splitter through the suitable optical lens and the sample to the mirror such that the light source is redirected in a second direction opposite the first direction through the optical path and the beam splitter, the aperture and the imaging lens to be received at the wavefront sensor.
A method for aligning the projection of a first light source with an in-coupler of a planar waveguide, the method including supplying a secondary light source through an optical path of the planar waveguide to exit at the in-coupler of the planar waveguide as an exit light, determining the concentricity of the exit light with respect to the first light source, and improving the concentricity of the exit light with respect to the first light source by adjusting the positioning of the first light source such that the exit light becomes concentric with the projection of the first light source.
An optical target system for a device under test disposed in an optical path, the optical target system including a pupil, a lens system and a target configured to be adjustable in position along the optical path such that the object distance of the target with respect to the lens system, is adjustable, the lens system is disposed between the pupil and the target along the optical path, wherein a first virtual image cast behind the target is of a first size when the target is disposed at a first position along the optical path, a second virtual image cast behind the target is of a second size when the target is disposed at a second position along the optical path.
H04N 17/00 - Diagnosis, testing or measuring for television systems or their details
G01B 11/25 - Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures by projecting a pattern, e.g. moiré fringes, on the object
A system for providing six-dimensional position data of an object in a three-dimensional (3D) space, the system including a light source configured to emit a light beam in an x-direction, a mirror including a mirror plane disposed in an x-y plane and a beam splitter configured for reflecting the light beam from the light source onto the mirror before being directed to the object, the light beam reflected by the object onto the beam splitter before being directed through a lens to an image plane to form an image.
An optical system including an enclosure including a front end and a rear end, a first pair of apertures configured to be disposed on a front plane on the front end of the enclosure and a single optical lens system disposed between the front end and the rear end of the enclosure, wherein the first pair of apertures are configured to allow sets of light rays into the enclosure through the single optical lens system to be cast on an image plane as first and second spots, the image plane being parallel to the front plane, if the first and second spots are concentrically disposed, the sets of light rays are determined to be parallelly disposed with respect to one another, otherwise the sets of light rays are determined to not be parallelly disposed with one another.
G01B 11/27 - Measuring arrangements characterised by the use of optical techniques for measuring angles or tapersMeasuring arrangements characterised by the use of optical techniques for testing the alignment of axes for testing the alignment of axes
G02B 23/00 - Telescopes, e.g. binocularsPeriscopesInstruments for viewing the inside of hollow bodiesViewfindersOptical aiming or sighting devices
11.
Optical parallelism system for extended reality metrology
An optical system including an enclosure including a front end and a rear end, a first pair of apertures configured to be disposed on a front plane on the front end of the enclosure and a single optical lens system disposed between the front end and the rear end of the enclosure, wherein the first pair of apertures are configured to allow sets of light rays into the enclosure through the single optical lens system to be cast on an image plane as first and second spots, the image plane being parallel to the front plane, if the first and second spots are concentrically disposed, the sets of light rays are determined to be parallelly disposed with respect to one another, otherwise the sets of light rays are determined to not be parallelly disposed with one another.
G01B 11/27 - Measuring arrangements characterised by the use of optical techniques for measuring angles or tapersMeasuring arrangements characterised by the use of optical techniques for testing the alignment of axes for testing the alignment of axes
G06T 7/62 - Analysis of geometric attributes of area, perimeter, diameter or volume
A system for determining a location of a feature of an object, the system including a first marker including a first area and a surface having two parallel edges and a third edge disposed perpendicularly to the two parallel edges, the two parallel edges are disposed about a first central axis of the two parallel edges; and a sensor configured to provide a distance from the sensor to a portion of the first marker, wherein the sensor is adapted to obtain distances between the sensor and the first marker and an environment surrounding the first marker to form a first map representing the distances corresponding to locations from which the distances are obtained using the sensor and the location of the feature of the object is determined based on at least one corner corresponding to an intersection formed of the third edge and one of the two parallel edges.
G01B 21/24 - Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring angles or tapersMeasuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for testing the alignment of axes for testing the alignment of axes
G01B 21/04 - Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness by measuring coordinates of points
G01B 21/16 - Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring distance or clearance between spaced objects
G01B 21/18 - Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring depth
13.
Diffraction-limited ultrawide angle lens for extended reality metrology
A lens including a first lens group including three positive singlets and an achromatic doublet for collecting all field rays received at the first lens group while making initial corrections of spherical and color aberrations, a second lens group including a near-symmetrical group including two positive meniscus elements and two negative meniscus elements, wherein the second lens group is configured to correct distortions, a third lens group including two positive lenses with an air gap disposed between the two positive lenses, wherein the third lens group is configured to correct field curvature and astigmatism and a fourth lens group including a triplet and a positive meniscus element, wherein the fourth lens group is configured to correct spherical, coma, axial color and lateral color aberrations, wherein the lens is disposed in an order of the first lens group, the second lens group, the third lens group and the fourth lens group.
G02B 9/64 - Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or – having more than six components
G02B 13/22 - Telecentric objectives or lens systems
G02B 13/00 - Optical objectives specially designed for the purposes specified below
A system for providing a virtual distance of a device under test, the system including a light source, a wedge shear plate including a first surface, a second surface and a wedge angle, wherein the second surface is disposed at the wedge angle with respect to the first surface and the wedge shear plate is configured to be disposed between the device under test and the light source, a first detector configured for receiving a first interference pattern formed as a result of the light source being disposed through and reflected by the first surface and the second surface of the wedge shear plate and a second detector configured for receiving a second interference pattern formed as a result of the light source being disposed through and reflected by the first surface and the second surface of the wedge shear plate.
An alignment tool including a first and a second positioning system configured for positioning and orientating a first lens and a second lens respectively, wherein a light beam is configured to be disposed through the first lens and the second lens to cast a light spot on the image plane, if the light spot does not stay stationary on the image plane when at least one of the first lens and the second lens is rotated about the central axis of the light beam, at least one of the first positioning system and the second positioning system is actuated to alter at least one of the position and orientation of at least one of the first lens and the second lens until the light spot becomes stationary on the image plane, indicating the first lens is coaxially disposed with the second lens.
A method for providing an object distance of a device under test (DUT) using a system including a first lens, a second lens, an optical pinhole disposed between the first lens and the second lens, a detector, a pair of gratings disposed between the second lens and the detector, the detector configured for receiving a Moiré pattern formed as a result of light from of the DUT being disposed through the first lens, the optical pinhole, the second lens and the pair of gratings, the method including obtaining the Moiré pattern using the detector and determining the object distance based on the Moiré pattern and one or more properties of the pair of gratings.
A system for providing an object distance of a device under test (DUT), the system including a first lens, a second lens, an optical pinhole disposed between the first lens and the second lens, a detector and a pair of gratings disposed between the second lens and the detector, the detector configured for receiving a Moiré pattern formed as a result of light from the DUT being disposed through the first lens, the optical pinhole, the second lens and the pair of gratings, wherein the object distance is determined based on the Moiré pattern and one or more properties of the pair of gratings.
A method for providing a virtual distance of a device under test using a system including a light source, a wedge shear plate, a first detector and a second detector, wherein the wedge shear plate is disposed between the device under test and the light source, the first detector configured for receiving a first interference pattern formed as a result of the light source being disposed through and reflected by the wedge shear plate, and the second detector configured for receiving a second interference pattern formed as a result of the light source being disposed through and reflected by the wedge shear plate, the method including obtaining the first interference pattern using the first detector, obtaining the second interference pattern using the second detector and determining the virtual distance based on the first interference pattern, the second interference pattern, the light source and the wedge shear plate.
A wavefront calibration method for a wavefront tester of a lens, the method including: measuring an air wavefront of the wavefront tester without the lens; measuring at least one golden sample wavefront to generate an actual wedge angle and refractive index of the at least one golden sample based on the air wavefront; calculating a measured wedge angle and refractive index based on the actual wedge angle and refractive index of the at least one golden sample; and linear fitting between the actual wedge angle and refractive index and the measured wedge angle and refractive index to produce an actual magnification of the lens.
A dimming tester station for testing an optical object, the optical object disposed along an axis represented by a central axis of the optical object, the dimming tester station including a motion stage for supporting the optical object, wherein the optical object is disposed between at least one camera with an entrance pupil of the at least one camera disposed in a first plane and a light emitting panel configured to emit light through a front surface disposed in a second plane, the central axis is substantially perpendicular to the first plane and the second plane, the entrance pupil of the at least one camera is disposed in an orientation facing at least a portion of the front surface, the motion stage is configured to be adjustable such that the location of the optical object from each of the first plane and the second plane is alterable.
A method for aligning the projection of a first light source with an in-coupler of a waveguide, the method including supplying a secondary light source through an optical path of the waveguide to exit at the in-coupler of the waveguide as an exit light; determining the concentricity of the exit light with respect to the first light source; and improving the concentricity of the exit light with respect to the first light source by adjusting the positioning of the first light source such that the exit light becomes concentric with the projection of the first light source.
A method for controlling an autoexposure function of a camera to a gray level setting, the method including establishing a critical exposure time of an image sensing device of the camera, wherein the critical exposure time of the image sensing device of the camera is an exposure time at which a first sensed gray level of the image sensing device of the camera is disposed at a target gray level, the sensed gray level is disposed in a trend of decreasing sensed gray level values; exposing the image sensing device of the camera to light to obtain a second sensed gray level and comparing the second sensed gray level at the critical exposure time to the target gray level, if the second sensed gray level is disposed at least at the target gray level, limiting the exposure of the image sensing device of the camera to the critical exposure time.
A system for extending the effective aperture of an optical output in a direction parallel to the optical axis of the optical output, the system including a beam splitter configured for receiving an output beam of the optical output along the optical axis of the optical output, the beam splitter configured for splitting the output beam into two light beams; a central mirror for receiving and directing a first of the two light beams from the beam splitter; and a pair of motorized mirrors each motorized mirror including a mobility mechanism and a mirror functionally connected to the mobility mechanism, each of the motorized mirrors is configured to be movable in a direction orthogonal to the optical axis, wherein the optical output is extended to the two light beams separated by a pupil distance adjustable by controlling at least a mobility mechanism of one of the pair of motorized mirrors.
An electromagnetic wave-trapping device including two surfaces, each disposed in a plane, the two surfaces disposed at a first angle with respect to one another to form an opening, one of the two surfaces is configured to be orientated such that an incident electromagnetic ray through the opening, is disposed at a second angle with respect to the one of the two surfaces.
A device for providing an output beam in a direction, the device including a plate including an exit pupil; a plurality of rows of optical elements disposed substantially in a first plane, each row of optical elements in the first plane including: at least one beam splitter; and a plurality of rows of optical elements disposed substantially in a second plane, the optical elements in the second plane include mirrors, wherein the second plane is disposed between the exit pupil and the first plane, wherein the at least one beam splitter at the first plane is configured to transmit an incident beam to one of a subsequent optical element at the first plane and a subsequent optical element at the second plane before being reflected to exit through the exit pupil.
G02B 27/14 - Beam splitting or combining systems operating by reflection only
G02B 7/182 - Mountings, adjusting means, or light-tight connections, for optical elements for prismsMountings, adjusting means, or light-tight connections, for optical elements for mirrors for mirrors
A system for calibrating an equipment, the system including a beam splitter; a first reticle configured to be removably attached to the equipment; and an image capture device including an image plane, wherein an image of the first reticle is configured to be received by way of the beam splitter at the image plane along an optical axis of the beam splitter, wherein the orientation as indicated by the first reticle is compared to an orientation of the image plane and if the orientation as indicated by the first reticle differs from the orientation of the image plane, the equipment is rotated about the optical axis of the beam splitter such that the orientation as indicated by the first reticle matches the orientation of the image plane.
G01B 11/27 - Measuring arrangements characterised by the use of optical techniques for measuring angles or tapersMeasuring arrangements characterised by the use of optical techniques for testing the alignment of axes for testing the alignment of axes
27.
Prism to enable large FOV high resolution sampling with smaller FOV imaging system
A prism module for enabling a large field of view high resolution sampling of incoming rays, the prism module including a plurality of elongated prisms disposed about a central axis, each of the prisms including a fore surface; an aft surface; and a reflecting surface connected on a first edge to the fore surface and connected on a second edge to the aft surface, wherein the fore surface is configured to receive the incoming light rays orthogonally disposed with respect to the fore surface, the reflecting surface configured to reflect the incoming light rays to cause outgoing light rays to exit at a right angle through the aft surface to form an image with a maximum distortion not recognizable by a human eye.
A chromatic confocal sensor configured for calibrating an orientation of an equipment about the optical axis of the chromatic confocal sensor, wherein the equipment is disposed at a first orientation about the optical axis of the chromatic confocal sensor, the chromatic confocal sensor including a light source, a collimator, a lens and a reticle, wherein the light source, the collimator and the lens are coaxially disposed along the optical axis, the reticle is configured to be interposable between the collimator and the lens along the optical axis, an image is configured to be cast by the light source through the collimator, the reticle and the lens on the equipment, the image is disposed at a second orientation about the optical axis and the equipment is calibratable by aligning the equipment with the image such that the first orientation approaches the second orientation.
G01B 11/27 - Measuring arrangements characterised by the use of optical techniques for measuring angles or tapersMeasuring arrangements characterised by the use of optical techniques for testing the alignment of axes for testing the alignment of axes
A system for providing two parallel light beams spaced-apart a selectable distance, the system including: a first beam splitter configured for reflecting a light beam from a light source to create a first datum light beam, the first beam splitter is fixedly attached to a base; a second beam splitter configured for reflecting a transmitted light beam from the light beam from the light source to create a second datum light beam, a third beam splitter configured for reflecting a transmitted light beam from the light beam from the light source to create a third datum light beam, a fourth beam reflecting device configured for reflecting a transmitted light beam from the light beam from the light source to create a fourth light beam. Each of the second, third beam splitters and fourth beam reflecting device is configured to be slidingly attached to the base.
G02B 7/182 - Mountings, adjusting means, or light-tight connections, for optical elements for prismsMountings, adjusting means, or light-tight connections, for optical elements for mirrors for mirrors
A colorimeter configured to receive central rays and marginal rays, the colorimeter including an image sensor configured for receiving the central rays to produce a first image; a spectrometer configured for receiving the marginal rays to produce a second image; and at least one optical device configured to reflect at least a portion of the marginal rays through a light path to the spectrometer, wherein the first image and the second image are aggregated to produce a total image that is more extensive than the first image.
A processing device suitable for processing multiple lens blanks into a finely ground product, the processing device including two processing fixtures, each including a fixture body with a curved surface. There are three grooves having centers disposed on the same circumferential surface. One of the processing fixtures corresponds to the inner surface of the groove as a flat surface, and the other processing fixture corresponds to the concave surface of the groove as a curved surface. The invention also discloses a method for processing a plurality of lens blanks into a finely ground product by using the processing device. The invention can directly perform the fine grinding processing of multiple cylindrical lens blanks, thereby eliminating a milling process and reducing the production cost while meeting the required thickness, radius of curvature and appearance of the finished product.
The invention discloses a toric mirror surface shape measurement method. The measurement method is as follows: first, according to the parameter information of the toric mirror to be measured, using three-dimensional modeling software, establish a CAD model of the toric mirror to be measured and then import the CAD model into the three-coordinate machine software, based on the three-coordinate machine to measure and construct the geometric characteristics of the solid toric mirror, establish the workpiece coordinate system, which is consistent with the CAD model coordinate system. Finally, use the three-coordinate machine to perform scanning measurements to the solid toric mirror and compare the scanning result with the theoretical value to obtain the measurement result data. The measurement method of the present invention is based on the three-coordinate measurement technology and has the advantages of strong operability and high measurement accuracy.
G01B 11/25 - Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures by projecting a pattern, e.g. moiré fringes, on the object
G06F 30/20 - Design optimisation, verification or simulation
A method for locating a center of a field of view of an optical element using a system having a surface disposed at a first illumination, an image receiver, a blocker disposed at a second illumination, the method including disposing the blocker at, at least one location in the field of view upon the surface in a first direction when the brightness of an image within the field of view of the optical element is disposed at a brightness and recording a first location of the blocker; repeating the disposing step in a second direction and at the brightness, wherein the second direction is opposite the first direction and each of the first direction and the second direction is parallel to the surface; and averaging the first location and the second location to yield the center of the field of view of the optical element in the first direction.
G02B 6/04 - Light guidesStructural details of arrangements comprising light guides and other optical elements, e.g. couplings formed by bundles of fibres
G01J 1/02 - Photometry, e.g. photographic exposure meter Details
G06T 7/73 - Determining position or orientation of objects or cameras using feature-based methods
G01J 1/18 - Photometry, e.g. photographic exposure meter by comparison with reference light or electric value using electric radiation detectors using comparison with a reference electric value
34.
Comprehensive test platform for fluorescence microscope objective lenses
A comprehensive test platform for fluorescence microscope objective lenses, comprising a bottom plate (1), wherein a horizontal adjustment device and a vertical fixing mechanism are provided on the bottom plate (1); the horizontal adjustment device comprises a two-dimensional translation stage (2) and a two-dimensional tilting stage (3) stacked in sequence; a reticle (4) is provided on the two-dimensional tilting stage (3); the vertical fixing mechanism comprises a back plate (6), and the back plate (6) is fixedly connected onto the bottom plate (1); an optical detection device and a guide sliding device (7) in the vertical direction are separately fixedly provided on the back plate (6); and a sliding support (8) that can slide along the guide sliding device is provided on the guide sliding device (7), and a measuring objective lens (5) is fixed on the sliding support (8).
A system for providing two parallel light beams spaced-apart a selectable distance, the system including: a first beam splitter configured for reflecting a light beam from a light source to create a first datum light beam, the first beam splitter is fixedly attached to a base; a second beam splitter configured for reflecting a transmitted light beam from the light beam from the light source to create a second datum light beam, a third beam splitter configured for reflecting a transmitted light beam from the light beam from the light source to create a third datum light beam, a fourth beam reflecting device configured for reflecting a transmitted light beam from the light beam from the light source to create a fourth light beam. Each of the second, third beam splitters and fourth beam reflecting device is configured to be slidingly attached to the base.
G02B 7/182 - Mountings, adjusting means, or light-tight connections, for optical elements for prismsMountings, adjusting means, or light-tight connections, for optical elements for mirrors for mirrors
A special-shaped plane reflecting mirror including a first reflecting mirror, a second reflecting mirror, a third reflecting mirror, a fourth reflecting mirror and a fifth reflecting mirror; wherein the second reflecting mirror and the fourth reflecting mirror are constructed the same and symmetrically arranged on both sides of the first reflecting mirror, the third and fifth reflecting mirrors have the same structure and are arranged symmetrically on both sides of the first reflecting mirror, the first reflecting mirror is placed at an angle of 45° with the horizontal plane, and the second reflecting mirror. The first mirror is placed at an angle of 45° with the horizontal plane, the angle between the reflection surface of the second mirror and the reflection surface of the first mirror is 165°, and the angle between the reflection surface of the third mirror and the reflection surface of the first mirror is 163°.
A spot sub-pixel center positioning method based on pixel movement and cutting, the method includes driving the CCD image plane to move along the x direction and the y direction through a displacement platform, selecting target pixels to move and cut the spot, and recording the gray value change of the target pixels, constructing the mapping relationship between gray value and displacement, performing differential transformation on the gray value and displacement curve, and finally performing interpolation fitting to obtain the sub-pixel coordinate value of the center point of the light spot. The measurement accuracy can be maintained within ½ of the single-step displacement of cutting. The method is not only suitable for strong and weak distribution of light spots, but also for fully saturated light spots, and also for asymmetrically distributed and blurred edges. It also has a good measurement effect and can handle a variety of spot scenes.
A method for controlling an autoexposure function of a camera to a gray level setting, the method including exposing an imaging device of the camera for a first exposure duration and obtaining a first gray level of the imaging device of the camera, exposing the imaging device of the camera for a second exposure duration within the first exposure duration and the maximum exposure duration and obtaining a second gray level of the imaging device of the camera, determining whether the first gray level and the second gray level are upward-trending from the first exposure duration to the second exposure duration and if the first gray level and the second gray level are determined to be upward-trending, interpolating for a target exposure duration based on the gray level setting, the first exposure duration and the first gray level.
A system for providing two spaced-apart parallel light beams wherein the space between the two spaced-apart parallel light beams is adjustable, the system including a first beam splitter configured for reflecting a light beam from a light source to create a first light beam; a second light reflecting device configured for reflecting a transmitted light beam from the light beam from the light source to create a second light beam; an optical flat including a first surface and second surface facing away from the first surface, the optical flat disposed in a manner with the first surface facing the first light beam and the second light beam, the first surface configured to reflect and transmit the first light beam and the second light beam; and a mirror.
A system for providing two spaced-apart parallel light beams wherein the space between the two spaced-apart parallel light beams is adjustable, the system including: a first beam splitter configured for reflecting a light beam from a light source to create a first light beam; a second beam splitter configured for reflecting a transmitted light beam from the light beam from the light source to create a second light beam; a third beam splitter configured for transmitting the first light beam and reflecting the first light beam to create a third light beam, the first beam splitter and the third beam splitter are disposed along a first central axis; a fourth beam splitter configured for transmitting the second light beam and reflecting the second light beam to create a fourth light beam.
A method for detecting lens cleanliness of a lens disposed in a flat-field optical path, the flat-field optical path including a light source, the lens, a camera, the light source is a narrow-band multispectral uniform surface light source, the camera's light-sensitive surface is disposed perpendicular to an optical axis of the lens and in the light position of the lens, the method including collecting the bright-field image data and dark-field image data in a plurality of spectra through the lens; for each pixel, performing a spectral differential flat-field correction operation to yield a plurality of spectral differentials; and displaying the spectral differentials in the form of a plurality of images to show a uniformity of each of the plurality of images, wherein a non-uniform area on each of the plurality of images is determined to have been caused by an impurity of the lens.
A method for detecting lens cleanliness of a lens in a flat-field optical path, the flat-field optical path includes a light source, the lens, a camera, the light source is a narrow-band multispectral uniform surface light source, the camera's light-sensitive surface is disposed perpendicular to an optical axis of the lens and in the light position of the lens and a pupil interposed between the lens and the light source, the method including collecting the bright-field image data and dark-field image data for a plurality of pupil aperture sizes through the lens; for each pixel, performing a pupil differential flat field correction to yield a plurality of PiPj pupil differentials; and displaying the pupil differentials in the form of a plurality of images to show uniformity of each image, wherein a non-uniform area on each image is determined to have been caused by an impurity of the lens.
A method for detecting lens cleanliness of a lens in a flat-field optical path, the flat-field optical path includes a light source, the lens, a camera, the light source is a narrow-band multispectral uniform surface light source, the camera's light-sensitive surface is disposed perpendicular to an optical axis of the lens and in the light position of the lens, the method including disposing the camera such that the camera's light-sensitive surface is located a distance from the focal plane of the lens and measuring the bright-field image data and the dark-field image data; for each pixel, performing an out-of-focus differential flat field correction to yield a plurality of DiDj out-of-focus differentials; repeating the disposing and performing steps by altering the distance at least two more times; and displaying the out-of-focus differentials in the form of a plurality of images to show uniformity of each of the plurality of images.
patents