92results about "Refractive power measurement" patented technology

The invention relates to a method for measuring optical lenses (10) using a device (1) comprising: a detection device (11) arranged on a first side (10a) of the lens (10) with respect to a plane of extension of the lens (10); one or more first radiation sources (12) with which the position of the lens (10) in space is determined; and / or a second radiation source (13) with which a planar refractive power distribution of the lens (10) over the surface is determined. According to the invention, a planar, moving pattern extending through the lens (10) is generated by the second or a further radiation source (13), which is detected by the detection device (11) through the lens (10), and one or more defects (15) on the surface of the lens (10) are detected by the computer unit (14).

The invention relates to the technical field of optical parameter measurement, in particular to an optical fiber nonlinear refractive index measurement method and system based on a narrow linewidth signal, and the method comprises the steps: obtaining the initial length of an optical fiber and the wavelength parameter and a plurality of power values of a laser group connected with a to-be-measured optical fiber, and calculating the effective length value of the optical fiber based on the initial length; main peak power and side peak power corresponding to the multiple power values are obtained, the power ratio of the main peak power and the side peak power is calculated, the power ratio is input into a calculation model for inversion calculation to obtain the corresponding target phase shift amount, and the power values and the corresponding phase shift amount are fitted to determine intermediate parameters; and calculating the nonlinear refractive index of the optical fiber by combining the intermediate parameter, the wavelength parameter and the effective length value. The technical problems that in the prior art, the calculation process is complex and is easily interfered by the dispersion effect, and the nonlinear effect intensity is unstable, so that the accuracy of the nonlinear refractive index of the optical fiber is low are solved. The method has the effects of reducing the calculation complexity of the nonlinear refractive index of the optical fiber and improving the accuracy at the same time.

A measurement system for a focal distance measurement of an optic includes: a translation stage including a base and platform configured to translate in linear motion relative to each other in an automated manner driven by a linear actuator; a reference material disposed on the translation stage and having a surface opposite the optic to be measured; a measuring device configured to measure a gap between the surface of the reference material and a distal tip of the optic in an automated manner; a spectrometer in optical communication with the optic; and a controller configured to operate the translation stage, the measuring device, and the spectrometer and to determine a focal distance of the optic based on a spectral characteristic of a measurement spectrum and on a final gap between the surface of the reference material and the distal tip of the optic at which the spectral characteristic is determined.

Examining a light optical element (LOE) may include placing a first slit optically between a projector configured to emit light and the LOE's first major surface and placing a second slit optically between the LOE's second major surface and a detector. Facet parallelism between two facets may be deduced based on a shift of the image reflected from the first facet to the second facet relative to light transmitted normal to the first and second major surfaces through a portion of the substrate not including a facet. Facet refractive index homogeneity or deviation may be deduced based on the light transmitted through the facet relative to light transmitted normal to the first and second major surfaces through a portion of the substrate not including a facet.

A method for characterizing optical elements of a lens element adapted for a person is presented, the lens element including: a holder including a refraction area having a refractive power based on a prescription for correcting an abnormal refraction of an eye of the person; and a plurality of optical elements configured so that at least one of slow down, retard or prevent a progress of the abnormal refraction of the eye of the person. A two-dimensional representation of the local optical power of the lens element is obtained using a fringe deflectometry method and the images used for the fringe deflectometry method consist of pixels smaller than or equal to 0.05 mm×0.05 mm.

Methods and systems for measuring the optical quality of an eye based on laser ray tracing are provided herein. Generally, the method uses the steps of temporally detecting the human eye with one or more laser beams in a set of points within the pupil of the eye, detecting projections of the laser beams reflected and scattered from the retina, and processing an image of the detected laser spots. In one embodiment, the components of the system include, but are not limited to, a laser having a dual-axis acousto-optic deflector and a dual-output generator of a digitally synthesized sinusoidal voltage, a collimating optical system, a conjugate telescope system, a polarizing beam splitter, and first and second photosensitive detectors, each component being in operable communication with a processing unit. Another embodiment uses a multi-laser block that does not require laser beam scanning.

A system can perform a method to identify when one or more lenses are the wrong prescription for the user. In some embodiments, the system notifies the user to switch prescription lenses or initiates an enrollment process for the lenses. In some embodiments, the system can identify the prescription of a lens and compare the identified prescription to one or more enrolled prescriptions for the user (e.g., previously defined in user settings associated with user profile). When the identified prescription of the lens does not match an expected enrolled prescription for the user), the system can notify the user to switch prescription lenses. When there are no enrolled prescriptions for the user, the device can prompt the user to enroll the lens.

The invention relates to an automatic probe focal length measurement system and method. A measurement system for focal length measurement of an optical device includes: a translation stage including a base and a platform configured to be driven by a linear actuator to translate in a linear motion relative to each other in an automatic manner; a reference material disposed on the translation stage and having a surface opposite the optical device to be measured; a measuring device configured to automatically measure a gap between a surface of the reference material and a distal tip of the optical device; a spectrometer in optical communication with the optics; and a controller configured to operate the translation stage, the measurement device, and the spectrometer, and determine a focal length of the optical device based on a spectral characteristic of the measurement spectrum and based on a final gap between a surface of the reference material and a distal tip of the optical device when the spectral characteristic is determined.

A method for predicting the lifetime of an EUV pellicle includes a) acquiring transmittance data of an EUV pellicle over a wavelength band ranging from an infrared region to an ultraviolet region, b) acquiring complex refractive index data of the EUV pellicle over the wavelength band ranging from the infrared region to the ultraviolet region, c) acquiring information on the relationship between density and transmittance of the EUV pellicle as a function of wavelength, and d) measuring the transmittance of the EUV pellicle for at least one measurement beam having a wavelength within the wavelength band, extracting an estimated density of the EUV pellicle on the basis of the measured transmittance and the information on the relationship between density and transmittance acquired in the step c), and predicting a remaining lifetime of the EUV pellicle on the basis of the estimated density.

A substrate inspection apparatus includes an optical coherence tomography (OCT) measuring device which outputs a cross-sectional image generated by optical interference between light radiated onto an organic layer on a substrate and reflected light reflected from the organic layer, a memory which stores one or more instructions and a processor which executes the one or more instructions stored in the memory, where the processor sets a reference line extending from a line in contact with one surface of the substrate, on which the organic layer is not disposed, from the cross-sectional image, measures an optical thickness from a first upper line to a lower line of the organic layer in a first area in the cross-sectional image, measures a physical thickness from the first upper line of the organic layer to the reference line, and calculate a refractive index based on the optical thickness and the physical thickness.

The present disclosure relates to a glasses diopter identification method and apparatus, an electronic device, and a storage medium, the method includes: acquiring an image to be processed; the image to be processed is obtained by performing image acquisition on a lens of target glasses under irradiation of a light source, and the image to be processed includes an optical feature generated when the light source emits light to the lens of the target glasses; and inputting input data including the image to be processed to a glasses diopter identification model to obtain a glasses diopter of the target glasses.

The application provides an optical lens measuring device and method, which comprises a light source, a half-wave plate, a polarization beam splitter, a 1 / 4 wave plate, a first mirror, a second mirror, a first beam splitter, a rotating module, a transmittance and reflectance detection module and a chirp detection module, the transmittance, reflectance and chirp are measured by constructing a reflection measurement path and a transmission measurement path and setting a detachable light beam shielding module on the mirror, without the need for recalibration and debugging, a large amount of time is saved, and the detection efficiency is improved. In addition, the rotating module is used to rotate the to-be-measured lens and the corresponding mirror lens, so that different optical parameters can be measured according to different optical lenses and different angles, the detection diversity is increased, the detection complexity is simplified, the cost of manpower and material resources is reduced, and the sustainable development of enterprises is beneficial.

A multi-focus optical detection device (100), comprising a detection area (1), a detection light source (2) and a beam splitter (3) which are arranged corresponding to the detection area (2), two cameras (4, 5) arranged corresponding to the beam splitter (3), and an image processor (6) electrically coupled to the two cameras (4, 5). The detection light source (2) can emit light (L) passing through the contact lens (203). The beam splitter (3) is used for splitting the light to make the light travel synchronously along two light splitting paths (24, 25). The two cameras (4, 5) are respectively located on the two light splitting paths (24, 25) and are used for focusing on the central part and the outer edge part of the contact lens (203), so as to respectively obtain two images (41, 51). The image processor (6) can be used for receiving the two images (41, 51) so as to combine the two images (41, 51) to form a detection image (61) covering the entire contact lens (203). Therefore, the multi-focus optical detection device (100) can use a high-resolution camera having a small depth of field, so as to effectively improve the detection capability.

Systems and methods for determining optical properties of a workpiece (e.g., silicon carbide workpiece). In some examples, the method includes providing emission of one or more electromagnetic radiation signals to the silicon carbide semiconductor workpiece such that the one or more electromagnetic radiation signals are at least partially transmitted through the silicon carbide semiconductor workpiece and internally reflected within the silicon carbide semiconductor workpiece. In some implementations, the example method includes receiving the one or more electromagnetic radiation signals at one or more detectors.

A system is disclosed for determining optical correction information of optical equipment. The system includes a camera system for capturing at least one camera image, a target, toward which the camera system is directed, a detection area between the camera system and the target for receiving the optical equipment including at least one lens, and a processing system with a searching routine for determining at least one center of the at least one lens based on the at least one camera image of the target via the optical equipment.

The invention relates to a method and to a measuring system for determining the effective focal length (EFL) of an optical system (10), in which an optical measuring device (11) is located in the image-side focal plane (BFP) of the optical system and an input beam (E1) is directed onto the optical system (10) at first and second angles (α1, α2) relative to the direction of the object-side optical axis (OA) and, in each case, the lateral position (x1, y1; x2, y2) of the points of incidence (AP1, AP2) of the associated output beams (A1, A2) on a measuring device (11) are ascertained and the effective focal length (EFL) of the optical system is calculated on the basis of the mutual spacing (formula (I)) of the points of incidence (AP1, AP2) of the first and the second output beams (A1, A2) and on the basis of the formula ΔL = EFL*tan(α2 - α1).

A device (100) for testing an astigmatic optical test object (OBJ) is presented. The device (100) comprises an illumination device (110) with a light source (112), an annular mask element (114), and collimating optics (116). The collimating optics (116) are designed to output light rays from the annular mask element (114) illuminated by the light source (112) as collimated test light (122) to the test object (OBJ). The device (100) also comprises an evaluation device (130) designed to record and evaluate an image (124) generated by the test object (OBJ) in response to the test light (122) in order to determine an axial position of the test object (OBJ) and an optical parameter related to the axial position.

An electronic device may include a variable focus camera that is used during lens measurement operations. During the lens measurement operations, the variable focus camera may capture images of one or more targets with and without an intervening lens. Focus information obtained by the variable focus camera may be used to determine the spherical power, the cylindrical power, and the cylindrical axis of the lens. The focus information may be obtained using a frequency sweep while capturing images of a single target. Alternatively, the focus information may be obtained by performing autofocus operations while focusing on different targets. Based on the determined spherical power, cylindrical power, and cylindrical axis of the lens, the electronic device may output lens information using a display, a speaker, or communications circuitry.

Examining a light optical element (LOE) may include placing a first slit optically between a projector configured to emit light and the LOE's first major surface and placing a second slit optically between the LOE's second major surface and a detector. Facet parallelism between two facets may be deduced based on a shift of the image reflected from the first facet to the second facet relative to light transmitted normal to the first and second major surfaces through a portion of the substrate not including a facet. Facet refractive index homogeneity or deviation may be deduced based on the light transmitted through the facet relative to light transmitted normal to the first and second major surfaces through a portion of the substrate not including a facet.

Provided is a device for measuring a refraction coefficient and an extinction coefficient. The device for measuring a refraction coefficient and an extinction coefficient may comprise: a light source for generating EUV light; a target for transmitting and reflecting the EUV light generated from the light source; a reflector disposed under the target to reflect the EUV light having been transmitted through the target; and a detector for detecting an interference pattern by collecting the EUV light having re-transmitted through the target after being reflected from the reflector and the EUV light reflected from the target, wherein a refraction coefficient and an extinction coefficient of the target may be detected by comparing a first interference pattern detected through the target and having a first thickness with a second interference pattern detected through the target and having a second thickness.

A method for converting measurements of a lens (1), comprising the following steps: receiving experimental lens measurements (EXP) of the lens (1) from optical measurements of the lens (1); determining (S1) a digital lens model representing the lens (1) from the experimental lens measurements (EXP); determining (S2) a transformed digital lens measurement (SIM2) representing the transformed lens measurements of the lens (1) based on the digital lens model; and determining (S3) a measurement result (CON) of the lens (1) based on the experimental lens measurements (EXP1) and the transformed digital lens measurement (SIM2).

The present invention relates to an apparatus for lens processing, with at least one receiving device for at least one transport box, with at least one measuring device, and at least one processing device. According to the invention it is provided that between the at least one measuring device and the at least one processing device at least one conveying device is provided, that between the at least one receiving device, the at least one measuring device and the at least one conveying device at least one handling device or apparatus is provided in such a way that the at least one measuring device, the at least one conveying device and the at least one processing device can be arranged or are arranged in any number and / or orientation relative to each other. The present invention further relates to a corresponding method for lens processing and to a processing device for lenses.

The invention relates to a measuring device (1), a system, a measuring method, and a computer program (5) for determining the optical properties of a transparent object (8). In order to be able to determine the optical properties of a transparent object (8) in a particularly simple manner, a measuring method is proposed comprising the following steps: capturing images (30, 31, 32) of a test pattern (3) during a capturing process, wherein the capturing process comprises capturing test patterns (21, 22) imaged by the object (8) at at least two different positions (11, 12) of the object (8), wherein the distances between the object positions (11, 12) are known, and wherein the relative positions of the image capturing devices (10) to one another and to the display device (2) remain unchanged during the capturing process, and determining the optical properties of the object (8) during a determination process without knowledge of the geometric shape.the position and the orientation of the object (8) from the images (30, 31, 32) of the test pattern (3) acquired during the acquisition process by comparing test patterns (20, 21, 22) acquired during the acquisition process.

To provide apparatuses, systems and methods for determining one or more parameters of a lens.SOLUTION: A method of determining one or more optical parameters of a lens is provided, comprising processing at least one depth map including depth information captured via the lens, and determining the one or more parameters of the lens based at least on the depth map.SELECTED DRAWING: Figure 8

The invention relates to a square self-focusing lens refractive index distribution measuring method and device, and the method comprises the steps: generating a laser beam through a laser light source, forming a parallel beam through a beam shaping assembly, and converting the parallel beam into a line focusing beam through a line focusing assembly. The line focusing light beam passes through the square self-focusing lens to be measured, the image acquisition assembly is used for acquiring the profile image of the modulated light beam, and finally the processing assembly is used for processing the image to invert the refractive index distribution. The measuring device comprises a laser light source, a light beam shaping assembly, a line focusing assembly, a sample table and an image acquisition assembly which are sequentially arranged along a light path, and a processing assembly connected with the image acquisition assembly. According to the invention, a non-contact measurement mode is adopted, rapid full-field measurement can be realized, the system structure is simple, the environmental interference resistance is high, and an effective technical means is provided for refractive index distribution measurement of the square self-focusing lens.

The multi-focus optical detection device (100) includes a detection area (1), a detection light source (2) and a spectral lens (3) installed corresponding to the detection area (1), two cameras (4, 5) installed corresponding to the spectral lens (3), and an image processor (6) electrically connected to the two cameras (4, 5). The detection area (1) is for installing a contact lens (203), and the detection light source (2) can emit light (L) that passes through the contact lens (203). The spectral lens (3) is used to split the light so that it travels synchronously along two spectral paths (24, 25). The two cameras (4, 5) are located in the two spectral paths (24, 25), respectively, and are used to acquire two images (41, 51) by focusing on the central portion and the outer edge portion of the contact lens (203). The image processor (6) can receive the two images (41, 51) and further combine them to construct a detection image (61) covering the entire contact lens (203), thereby enabling the multi-focus optical detection device (100) to effectively improve detection capabilities using a high-resolution camera with a shallow depth of field.

A performance evaluation method for a spectacle lens comprising calculating a change rate of a first component and a change rate of a second component with a computer to calculate at least one of a distortion evaluation value and a shaking evaluation value, the first component being a component in a first direction of a prism refractive index, the second component being a component in a second direction of the prism refractive index, the distortion evaluation value being a value for evaluating a distortion regarding a spectacle lens, the shaking evaluation value being a value for evaluating a shaking regarding the spectacle lens.

The invention relates to a device (100) for imaging through an optical system to be tested. The device (100) comprises a first device section (110) with a first degree a transmission for electromagnetic waves and a second device section (120) with a second degree of transmission for the electromagnetic waves, wherein the second degree of transmission is greater than the first degree of transmission. At least one of the device sections (110, 120) has an annular shape.

Method for characterizing at least part of a lens element, for example a myopia control lens element, adapted for a wearer, said lens element providing a first optical function having a power based on a prescription of the wearer, and comprising a plurality of optical elements, for example at least twenty optical elements, each optical element of the plurality of optical elements providing one or more optical functions, at least one of which is different from the first optical function, the lens element comprising two surfaces, wherein the method comprises : - obtaining over a measuring pupil positioned on said at least part of the lens element at least a value of the modulation transfer function (MTF) of the lens based on at least one feature of the at least part of the lens element measured over the measuring pupil, - determining a value for an estimator factor over the measuring pupil based on the obtained at least one value of the modulation transfer function (MTF) of the lens over said measuring pupil, - determining for different positions of the measuring pupil on the at least part of the lens element a value of the estimator factor, - characterizing said at least part of the lens element by computing the determined values of the estimator factor at the different positions of the measuring pupil.

A system can perform a method to identify when one or more lenses are the wrong prescription for the user. In some embodiments, the system notifies the user to switch prescription lenses or initiates an enrollment process for the lenses. In some embodiments, the system can identify the prescription of a lens and compare the identified prescription to one or more enrolled prescriptions for the user (e.g., previously defined in user settings associated with user profile). When the identified prescription of the lens does not match an expected enrolled prescription for the user), the system can notify the user to switch prescription lenses. When there are no enrolled prescriptions for the user, the device can prompt the user to enroll the lens.