139results 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 provides a flexible transparent display screen detection method, and belongs to the technical field of screen detection, and the method comprises the steps: carrying out a light transmittance dynamic attenuation test through optical detection equipment in a bending state of a to-be-detected flexible transparent display screen, and constructing a light transmittance attenuation image; stripping the to-be-tested flexible transparent display screen layer by layer by using a laser stripping technology, and quantifying the light transmission loss of each layer based on an integrating sphere system; point position analysis is carried out on the light transmittance attenuation image based on the light transmission loss, the abnormal attenuation point position is determined, the real use condition can be simulated to carry out layered detection on the flexible transparent display screen, and the detection accuracy is improved.

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 for compensating measurements of devices under test (DUTs) captured through prescription lenses (and associated imaging systems, devices, and methods) are described herein. In one embodiment, a method for characterizing focus quality of a DUT through a prescription lens includes adjusting an optical power of a measurement device to compensate for optical power provided by the prescription lens. The method further comprises imaging, using the measurement device, a test pattern through the prescription lens, wherein the test pattern is displayed by the DUT; measuring contrast of an edge in the test pattern at a point of interest within the imaging of the test pattern; and determining focus quality of the DUT based at least in part on the contrast measurement.

A computer implemented method for determining a refractive power value of an intraocular lens to be inserted is described. The method includes measuring ophthalmological patient data, receiving a target refraction value, determining a first refractive power value of an intraocular lens to be inserted, with the measured ophthalmological patient data and the target refraction value being used as input data, determining, by means of a trained machine learning system, a second refractive power value of the intraocular lens to be inserted, the measured ophthalmological patient data and the received target refraction value being used as input data for the trained machine learning system, and determining the final refractive power value of the intraocular lens to be inserted from the first refractive power value and the second refractive power value by means of an individual boosting factor value.

Acoustic optical integrity detection system architectures and methods can be used to detect optical integrity of an optical component by detecting a discontinuity on and / or in the optical component (e.g., on the optical surface and / or within the bulk of the optical component). In some examples, integrity detection can be used to ensure safety compliance of an optical system, optionally including a laser. Acoustic integrity detection can utilize transducers (e.g., piezoelectric transducers) to transmit ultrasonic waves along an optical surface and / or through the thickness of an optical component. A discontinuity of the optical surface can interact with the transmitted wave causing attenuation, redirection and / or reflection of at least a portion of the transmitted wave. Portions of the transmitted wave energy after interaction with the discontinuity can be measured to determine discontinuity location, type, and / or severity.

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 optical system comprises a front optical element, a back optical element and a wave guide. The back optical element is intended to be positioned closer to an eye of a wearer of the optical system than the front optical element. The wave guide is between the front optical element and the back optical element. The wave guide has an exit surface being arranged to output an image to the wearer. The method comprises determining values of parameters of a first part of the front optical element corresponding to the near vision part of the optical system and values of parameters of a second part of the front optical element corresponding to a far vision part of the optical system based on an intended power map of the optical system.

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.

This disclosure relates to methods and devices for designing customized contact lenses, by initially making dynamic wavefront sensor measurements through a trial contact lens that is fitted on an eye, and then calculating a WaveFront Guided (WFG) correction to be applied to the trial contact lens that reduces the RMS level of aberrations as much as practically possible. The output of the wavefront correction program is a customized lathe file that the manufacturer can use to make customized contact lenses on a lathe. The method works best for soft contact lenses and scleral lenses.

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.

To determine optical parameters of a lens of eyeglasses by processing an image of a target captured via a lens.SOLUTION: Embodiments include apparatuses, systems and / or methods of determining one or more optical parameters of a lens of eyeglasses. An embodiment may include one or more tangible computer-readable non-transitory storage media including computer-executable instructions operable to enable at least one computer processor to perform operations of determining one or more optical parameters of a lens of eyeglasses. The operations include processing at least one image of a screen 230 captured via a test lens 210; and determining the one or more optical parameters of the lens based on the at least one image.SELECTED DRAWING: Figure 2

The invention relates to the technical field of optical cable detection, in particular to a system and method for detecting an optical cable special for logging based on big data. The method comprises the steps of measuring a pressure value borne by an optical cable deployed in an oil-gas well based on a pressure sensor, and performing segmented labeling on the optical cable based on the pressure value to obtain labeled segments; based on the optical cable azimuth information data, calculating to obtain an outside-sleeve optical cable azimuth angle change value, and based on the azimuth angle change value, judging whether the marked segmented optical cable meets the azimuth angle change requirement of the logging optical cable or not; analyzing and processing the optical time domain reflection data to obtain the total power of reflected light of the marked segments of the optical cable, and judging whether the marked segments of the optical cable are damaged or not based on the total power of the reflected light of the optical cable; the environment state characterization value is generated based on the environment data, whether the environment where the marked and segmented optical cable is located meets the optical cable working environment requirement or not is judged based on the environment state characterization value, the optical cable detection efficiency can be improved, the detection comprehensiveness is improved, and the detection real-time performance is enhanced.

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.

Provided is a refractive characteristic measurement device (1) that measures a refractive characteristic of an eye (25), the device including: a light emission unit (20); an opening member (10) that is positioned between the light emission unit and the eye and has a first opening (11) and a second opening (12) through which light emitted by the light emission unit is narrowed and passed; a first optical element (13) that is provided in the first opening and transmits light in a first wavelength band; and a second optical element (14) that is provided in the second opening and transmits light in the second wavelength band, in which the light emission unit includes a background portion (23) that emits white light, a first visual target portion (21) that emits first light (Li) that is a complementary color to light in the first wavelength band, and a second visual target portion (22) that emits second light (L2) that is a complementary color to light in the second wavelength band.

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 refractive power based on the prescription of the wearer, and comprising a plurality of 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; wherein the method comprises: - obtaining a two-dimension representation of the local optical power of at least part of the lens element using a deflectometry method or fringe projection profilometry, - determining the optical power distribution over at least part of the two-dimension representation of the lens element in the form of a representation of the data as a histogram or a stem-and-leaf plot; and - characterizing at least the part of the lens element within said at least part of the two-dimension representation of the lens element by analyzing the representation of the data, for example characterizing the histogram or stem-and-leaf plot.

This eyeglasses lens measurement device for measuring a eyeglasses lens includes a light source for emitting a measurement light beam toward the eyeglasses lens, a transmissive display that transmits the measurement light beam from the light source and is capable of displaying an indicator pattern formed through the arrangement of a plurality of indicators, a display control means for controlling the display of the indicator pattern, a detector for detecting the measurement light beam that has passed through the eyeglasses lens and transmissive display, an optical characteristic acquisition means for acquiring an optical characteristic of the eyeglasses lens on the basis of a detection result from the detector, and a lens information acquisition means for acquiring lens information different from the eyeglasses lens optical characteristic on the basis of a detection result from the detector. The optical characteristic is acquired through the display of the indicator pattern, and the lens information is acquired through the omission of the display of at least a portion of the indicator pattern. This makes it possible to use a simple configuration to accurately acquire an optical characteristic and lens information for an eyeglasses lens.

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.

An eyeglasses lens measurement device measures an eyeglasses lens of eyeglasses. The eyeglasses lens measurement device includes a light source that emits a measurement light flux toward the eyeglasses lens, a transmissive display that transmits the measurement light flux from the light source and displays an index pattern formed by arranging a plurality of indexes, a detector that detects the measurement light flux passing through the eyeglasses lens and the transmissive display, and a controller. The controller is configured to control a display of the index pattern, acquire an optical characteristic of the eyeglasses lens, based on a detection result of the detector, and acquire lens information different from the optical characteristic of the eyeglasses lens, based on a detection result of the detector.

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).

The invention relates to an optical voltage transformer quarter-wave plate additional birefringence calculation method based on a linear demodulation mode, and belongs to the technical field of high voltage measurement and optical voltage transformers. Linear demodulation of phase delay is realized based on an S-wave plate, specifically, light emitted by a light source forms linearly polarized light through a polarizer, electro-optical phase delay is generated through an electro-optical crystal modulated by an electric field, the linearly polarized light is synthesized under the action of a quarter-wave plate, and additional birefringence generated by the quarter-wave plate due to temperature drift is considered. Electro-optic phase delay and additional birefringence (collectively referred to as phase delay variation) are both converted into rotation of a linearly polarized light polarization plane, after the linearly polarized light passes through the S wave plate and the polarization analyzer, the rotation angle of the polarization plane is converted into linear translation of a strip-shaped light spot, and the rotation angle and the linear translation meet a linear relation. Therefore, the displacement of the light spot is determined by positioning the light spot, and the rotation angle of the polarization plane can be measured. And the additional birefringence introduced by the quarter-wave plate can be calculated by modulating the alternating-current voltage to be measured.

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.