33 results about "Thin-film interference" patented technology

The invention relates to the technical field of optical detection, and discloses an object surface three-dimensional topography measurement method based on optical interference, which comprises the following steps: acquiring a mixed time domain interference signal sequence in an axial scanning process; extracting seed pixels and constructing a spatial topology connectivity feature matrix; introducing fractional Fourier transform, and constructing a joint decoupling objective function containing a frequency domain nonlinear phase distortion evaluation index and a time domain physical invariant evaluation index; executing multi-stage optimization for the seed pixels, and locking a global optimal rotation angle; array self-adaptive decoupling is executed in combination with the spatial topology connectivity feature matrix, and an optimal rotation angle matrix is generated; and performing signal decoupling and reconstruction on the mixed signal, and extracting the absolute surface height of each pixel point to generate three-dimensional shape data. According to the invention, through multi-dimensional joint decoupling and spatial prior constraint, the problem of phase decoupling caused by film interference aliasing is solved, and the calculation overhead of a large-pixel array is reduced while the measurement precision is improved.

The invention relates to the field of cable detection, and discloses a cable oil film uniformity detection system based on machine vision, and the system comprises an active photoelectric illumination module which is used for generating a modulation optical signal of which the polarization state changes under a preset time sequence, and projecting the modulation optical signal to the surface of a cable; the synchronous photoelectric sensing and conversion module is used for receiving the modulated optical signal reflected by the surface of the cable and synchronously converting the modulated optical signal into a first electrical signal flow and a second electrical signal flow; wherein the first electrical signal flow represents multi-spectral intensity information of the reflected modulated optical signal, and the second electrical signal flow represents multi-polarization intensity information of the reflected modulated optical signal. By utilizing the sensitivity difference of the thin film interference model and the elliptical polarization model to the optical parameter change of the oil product, the systematic measurement error caused by batch replacement of the oil product or temperature fluctuation can be actively corrected, and the accuracy and long-term stability of the detection result are improved.

A head-mounted device may have left-eye and right-eye optical modules that may have a display that creates an image and a corresponding lens that provides the image to an eye box for viewing by a user. The optical modules each include a lens barrel to which the display and lens of that optical module are mounted and a head-mounted optical module gaze tracking system. The gaze tracking system may have light-emitting devices such as light-emitting diodes that emit light at a given near infrared wavelength and may operate through the lens and a removable supplemental lens. The supplemental lens may be a prescription lens and may have an antireflection portion that reduces the reflectance of the lens across visible and near infrared wavelengths. The antireflection portion may be a thin-film interference coating or a moth-eye portion. In this way, the gaze tracking system may operate through the removable supplemental lens.

A system may include a broadband light source emitting polarized light that is polarized to two orthogonal polarization states, multiple beam splitters for combining and splitting the polarization states, and interferometric cell for creation of interference patterns with respect to a sample surface, lenses of appropriate design that focus the polarized light at predefined locations, and sensors that analyze the polarized light as a function of angle and wavelength. The system may also include a controller configured to modulate the reference arm through operation of an optical chopper and allow for different data analysis modes to be used on the system produced data.

Asymmetric interferometry is used with various embodiments of an optical photo-thermal infrared (OPTIR) system to suppress thin film interference effects. Systems and methods for operating a photo-thermal infrared microscope to achieve these purposes are described herein. These may include illuminating a sample region with an infrared pump beam, splitting a probe beam into two paths (one towards the sample and the other towards a reference reflector), directing the probe beam towards the sample to produce interference radiation, collecting the interference radiation as collected probe light, recombining the collected probe light with the reflected probe radiation, and recombining the recombined probe light with the reflected probe radiation. The recombined light is separated between the two detectors, and the signals from the detectors are used to generate a composite photo-thermal signal that suppresses thin film interference effects caused by interference radiation.

The utility model discloses an LED lamp bead capable of preventing blue light harm, which relates to the technical field of LED lamp beads and comprises a lamp bead body, a group of pins are fixedly connected to the lower surface of the lamp bead body, a protective cover used for protection is arranged on the annular side face of the lamp bead body, and a group of protective sleeves used for limiting are arranged below the protective cover. Two first magnetic attraction blocks are fixedly connected between one set of protective sleeves, two sets of arc-shaped sleeves used for protection are arranged below one set of protective sleeves, the protective covers are made of polymethyl methacrylate materials and are excellent in transparency, high in surface hardness and good in abrasion resistance, the surfaces of the protective covers are plated with multiple layers of optical thin films for preventing blue light, the blue light is reflected according to the thin film interference principle, and the anti-blue-light effect is achieved. And a group of grooves are formed in the inner wall of the protective cover, so that the inner wall of the protective cover is uneven, light beams emitted by the lamp bead body are reflected and refracted, light rays are propagated and mixed for multiple times in the protective cover, direct emission of blue light is reduced, and the uniformity and the spectral quality of the light are improved.

Asymmetric interferometry is used with various embodiments of Optical Photothermal Infrared (OPTIR) systems to suppress thin film interference effects.

The application discloses a transparent electrostatic ultrasonic transducer and a display device, wherein the transducer increases the surface roughness of the vibrating diaphragm surface and / or the insulating layer surface, so that the phase relationship of the light waves reflected from the two interfaces changes rapidly in space when superimposed, or the light waves are diffusely reflected, so that a large-area and bright color coherent interference pattern cannot be formed. Through the scheme, the conditions for thin film interference can be effectively destroyed, the transparent electrostatic ultrasonic transducer no longer presents obvious rainbow stripes under white light, the visual appearance is improved, so that when the transparent electrostatic ultrasonic transducer is integrated with a display screen, visual interference on the display content is avoided, the user experience is improved, and the application is particularly suitable for applications with high requirements on visual quality, such as smart phones, tablet computers, vehicle-mounted displays and the like.

The invention provides a multilayer film saturable absorption mirror based on interference and an optimization method. The multilayer film saturable absorption mirror comprises a saturable absorption material film, a middle interference layer, a gold film and a silicon substrate, the thin film is a flat thin film with a saturable absorption characteristic; the middle interference layer is a ZnS thin film layer deposited on the gold reflector substrate; and the gold film and the silicon substrate jointly form a gold reflector substrate. The thin film interference cancellation condition is achieved by adjusting the thicknesses of the thin film and the middle interference layer, so that the linear reflectivity is extremely low when the light intensity is low; as the light intensity is enhanced, the refractive index of the material is changed and the absorption coefficient is reduced until the material is bleached by strong light, the optical lengths of the thin film and the middle interference layer do not meet destructive interference any more, so that the upper limit of the modulation depth cannot be greatly reduced due to the introduction of the middle interference layer. According to the invention, the linear reflectivity or transmittance of the thin film type saturable absorption mirror at low light intensity can be effectively reduced to enlarge the modulation range, the effect of improving the modulation depth is achieved, and the method is simple to operate, high in flexibility and universal.

The utility model discloses an infrared ray cut-off filter which comprises a substrate, a hard protective film, a multilayer interference film and an anti-reflection coating are sequentially deposited on one surface of the substrate according to the direction from the air side to the substrate, the multilayer interference film is composed of at least five high refractive index material layers and at least five low refractive index material layers, and the high-refractive-index material layers and the low-refractive-index material layers are alternately stacked. According to the utility model, a plurality of layers of dielectric films are deposited on the surface of the substrate, selective transmission and reflection characteristics for light in a specific wavelength range are formed based on a thin film interference principle, and a strong reflection band is formed in a near-infrared region while high transmittance is effectively kept in a visible light range, so that the purpose of cutting off infrared rays is achieved.

The application relates to a carbon-containing thin film interference microsphere with non-iridescent structural color and a preparation method, and belongs to the field of new materials. The carbon-containing thin film interference microsphere with non-iridescent structural color is prepared by high-temperature calcination of polymer-inorganic hybrid microspheres; the polymer-inorganic hybrid microspheres are prepared by uniformly coating an inorganic thin film interference layer on the surface of polymer microspheres, and the average particle size is 300-1800 nm, and is further preferably 500-1000 nm. The non-iridescent submicron thin film interference microsphere structural color pigment has the advantages of bright color, small particle size and simple preparation method, and can be used as a novel structural color pigment.

Asymmetric interferometry is used with various embodiments of Optical Photothermal Infrared (OPTIR) systems to suppress thin film interference effects. Systems and methods are described herein for operating a photothermal infrared microscope to accomplish these objectives. These can include illuminating a sample region with an infrared pump beam, splitting a probe beam into two paths (one towards the sample and the other towards a reference reflector), directing the probe beam towards the sample to create interfering radiation, collecting the interfering radiation as collected probe light, recombining the collected probe light with reflected probe radiation, dividing the recombined light between two detectors, and using signals from the detectors to generate a composite photothermal signal that suppresses the effects of thin film interference caused by the interfering radiation.

The invention relates to the technical field of film uniformity detection, in particular to a PETG film uniformity detection device based on optical interference, which is used for film uniformity detection and comprises a workbench, and the workbench is provided with a micrometer, a light emitting module, an acquisition module, a processing module, a storage module and a control module. By means of the film interference phenomenon that light beams can be reflected after passing through the upper surface and the lower surface of a film, an imaging plate and an area-array camera are adopted to record graphic data of an upper light reflecting area, a lower light reflecting area and a highlight area, and comparison data are formed by combining manual and mechanical detection thickness values of a ten-thousand-minute ruler. A plurality of contrast data meeting the uniformity requirement are selected for pattern contour integration to form a highlight range region, when the thin film is continuously detected, the detection part of the thin film meets the uniformity requirement as long as the highlight region formed by irradiating the thin film is in the highlight range region, and rapid and continuous detection can be realized.

An electronic device may be provided with conductive structures such as conductive housing structures. A visible-light-reflecting coating may be formed on the conductive structures. The coating may have adhesion and transition layers and a thin-film interference filter on the adhesion and transition layers. The thin-film interference filter may be a four-layer interference filter stacked directly onto the adhesion and transition layers and having an uppermost SiCrN layer, a lowermost SiN layer, and interleaved SiH and SiN layers. If desired, an opaque coloring layer such as a Cr layer may be disposed between the interference filter and the adhesion and transition layers. The coating may exhibit a deep red or orange color that has a relatively uniform visual response even when the underlying conductive structures have a three-dimensional shape.

The invention discloses a full-spectrum water quality detection method with transient interference self-consistent compensation. The method comprises the following steps: acquiring absorbance; performing transient interference separation processing on the absorbance to generate absorbance after stripping scattering; performing film interference decurl processing on the absorbance after stripping and scattering to generate decurl absorbance; and quantitatively calculating the concentration vector of the target object based on the decurl absorbance. According to the invention, two key interferences of transient scattering and film interference can be compensated in a cascade manner, a self-consistent closed loop is realized through uncertainty propagation and self-cleaning triggering, and the accuracy and robustness of online water quality detection are improved.

The application discloses a kind of six-degree-of-freedom error correction three-dimensional motion measurement system and measurement method, including optical air floatation platform, six-degree-of-freedom error correction three-dimensional motion measurement system, two-dimensional motion machine table, reference optical flat, color confocal measurement bridge component, camera measurement bridge component and thin film interference component;Camera measurement bridge frame module in the application acquires the image of concentric circle in the image grid sensor system, the concentric circle image is based on subpixel processing and concentric circle identification to obtain high-precision transverse displacement, based on linear interpolation calculation mode forms two virtual measurement lines in X, Y two directions, the intersection of measurement line is the placement position of color confocal head, the thin film interference component is placed directly below the head, the thin film interference component uses super-precision optical flat as measurement reference, so that the application satisfies three-dimensional zero Abbe error, three-axis zero coupling error, improve the measurement accuracy of three-dimensional motion measurement platform.

A full-field or line-field swept-source optical coherence tomography (OCT) system that uses a tilt-tuned cat's-eye laser whose semiconductor gain chip is dimensioned to lase in multiple spatial modes. The multimode output is preserved by free-space or multimode-fiber coupling from the laser to the interferometer, and is shaped by cylindrical line-forming optics to illuminate the sample with a long aspect-ratio line or across the field. The multimode operation produces a super-Gaussian, near flat-top intensity profile along the line or field and reduces spatial coherence, improving detector uniformity and lowering pixel cross-talk. Example implementations use a single-angled-facet gain chip with ridge width >3 μm and / or active-layer ridge height >2 μm, a thin-film interference filter tilt-scanned by a servoed galvanometer with encoder, and a line-scan camera to acquire parallel A-scans for B-scan formation. The approach maintains OCT advantages while relaxing single-mode constraints on the swept source and improving line-field and full-field image quality.

The invention discloses a colored electrothermal film based on optical interference regulation and a preparation method thereof. The electrothermal film comprises an electrothermal unit and an optical interference regulation and control layer arranged on the outer surface of the electrothermal unit, and the optical interference regulation and control layer is a multi-layer film system formed by alternately stacking high and low refractive index material layers. Structural colors are generated through thin film interference, the colorful and lasting decoration effect is achieved, and the original light transmitting and heating performance is not affected. The preparation method adopts a vacuum coating process to deposit the optical interference regulation and control layer. Optionally, a gradient color effect can be realized by using a mask plate during deposition; or the innermost layer of the optical layer is designed as the seed crystal induction layer of the transparent conductive layer, so that the electric heating performance is improved. The problem that an existing electrothermal film is single in color is solved, and the electrothermal film is suitable for the fields of high-end consumer electronics, smart home and the like.

The invention discloses a transparent material surface patterning coloring method, which relates to the technical field of structure coloring, and comprises the following steps: providing a transparent substrate; preparing a metal layer on the transparent substrate; preparing an interference layer on the metal layer; pulse laser parameters and processing parameters are selected and tested, pulse laser is aligned with a composite layer formed by the interference layer and the metal layer, the pulse laser is adopted to scan the composite layer formed by the metal layer and the interference layer attached to the transparent substrate, and different thicknesses are achieved for different patterned areas in the interference layer; meanwhile, the optical properties of different patterned areas in the interference layer are changed, so that the different patterned areas form different structural colors; wherein different patterned areas in the interference layer have different thicknesses and different optical properties. According to the method, an artificially controllable structural color system is constructed through the film interference effect, and surface coloring and color patterning of the transparent material are efficiently achieved at low cost.

To provide: an article which includes a thin film interference pigment and a coating including a colored selectively absorbing nanoparticles, where the article can exhibit a change in hue, lightness and / or chroma compared to the thin film interference pigment alone; and methods of making the same.SOLUTION: An article comprises: a thin film interference pigment 12; and a coating 10 including colored selectively absorbing nanoparticles 14 on the thin film interference pigment.SELECTED DRAWING: Figure 22

The embodiment of the invention provides a film overflow detection method and device based on thin film interference imaging, and the method and device achieve the effective extraction of information through the innovative design of a feature extraction system, geometric analysis and texture analysis. And a similarity evaluation mechanism is constructed, and a reliable detection strategy is established in combination with feature fusion and region positioning. Abnormality analysis is introduced, and the accuracy of detection is ensured through parameter quantification and grade evaluation. According to the method, the defects of the traditional technology in the aspects of feature extraction, region positioning, anomaly analysis and the like are effectively overcome, and technical guarantee is provided for film layer detection.

This invention discloses a full-spectrum water quality detection method with self-consistent compensation for transient interference, comprising: acquiring absorbance; performing transient interference separation processing on the absorbance to generate absorbance after stripping scattering; performing thin-film interference de-curling processing on the absorbance after stripping scattering to generate de-curled absorbance; and quantitatively calculating the target analyte concentration vector based on the de-curled absorbance. This invention can cascade compensation for two key types of interference: transient scattering and thin-film interference, and achieves self-consistent closed-loop processing through uncertainty propagation and self-cleaning triggering, thereby improving the accuracy and robustness of online water quality detection.

The application discloses a kind of lithium ion battery pole piece coating defect on-line detection method based on machine vision, it is related to lithium ion battery manufacturing quality detection technical field.For the problem of missing detection due to insufficient contrast of conventional dry film optical detection of small metal foreign matter in high-speed coating production line, piezoelectric acoustic emission sensor array is arranged in pairs on the coating die lip plate, background vibration is suppressed by differential processing, foreign matter acoustic emission pulse is captured and acoustic characteristic is extracted to predict foreign matter parameters;Based on the predicted parameters, the expected template of the interference fringes in the downstream wet film area is calculated using the thin film interference physical model;Acoustic emission event triggers downstream camera to collect interference image at predicted position and extract features;Match the expected template with the actual observation, confirm and classify foreign matter through acoustic-optical matching score, and evaluate the embedded depth.The method increases the detection sensitivity of metal foreign matter to 40 μm level when the coating speed is above 80 m / min, and can identify fully embedded foreign matter that cannot be detected by pure optical solution.

A full-field or line-field swept-source optical coherence tomography (OCT) system that uses a tilt-tuned cat's-eye laser whose semiconductor gain chip is dimensioned to lase in multiple spatial modes. The multimode output is preserved by free-space or multimode-fiber coupling from the laser to the interferometer, and is shaped by cylindrical line-forming optics to illuminate the sample with a long aspect-ratio line or across the field. The multimode operation produces a super-Gaussian, near flat-top intensity profile along the line or field and reduces spatial coherence, improving detector uniformity and lowering pixel cross-talk. Example implementations use a single-angled-facet gain chip with ridge width >3 μm and / or active-layer ridge height >2 μm, a thin-film interference filter tilt-scanned by a servoed galvanometer with encoder, and a line-scan camera to acquire parallel A-scans for B-scan formation. The approach maintains OCT advantages while relaxing single-mode constraints on the swept source and improving line-field and full-field image quality.

The application relates to the technical field of thermal management, in particular to a preparation method and application of a Janus radiation thermal management material of a double module, which comprises the following steps: placing a titanium foil serving as an anode and a stainless steel sheet serving as a cathode in an electrolyte H3PO4 solution, adopting an anodic oxidation method to obtain a colored titanium foil; dissolving P(VDF-HFP) in acetone, adding deionized water to obtain a precursor solution; taking the colored titanium foil as a radiation heat preservation film, coating the precursor solution on the back of the colored titanium foil, and drying to form a white radiation cooling surface. The radiation heat preservation layer is prepared based on the film interference principle, the film with structural color is prepared as a radiation heat preservation layer, the radiation heat preservation layer solves the contradiction that color and radiation heat preservation effect cannot be achieved, and the radiation heat preservation layer simultaneously has multiple colors compared with ordinary commercial coatings and radiation heat preservation capacity. The radiation thermal management material can switch the refrigeration / heat preservation mode according to the environment, has huge energy-saving potential, and provides a feasible method for replacing ordinary commercial dyes.

An aspect of the disclosure relates to a thin film including an amorphous array of particles including a top surface and a bottom surface opposing each other, the thin film exhibiting thin film interference and further coherent scattering from the amorphous array of particles, wherein the thin film may include first regions and second regions, wherein the thin film interference of the second regions may be suppressed as compared to the first regions. Another aspect of the disclosure relates to a product including an indicium including a thin film in accordance with any of the previous claims, wherein the indicium may include an encoded pattern encoded by the relative position of the second regions to the first regions, wherein the encoded pattern may be visible under specular reflection of light of a pre-determined wavelength. Another aspect of the disclosure relates to a method of producing a thin film.

The invention provides a leaf spectrum growth state detection method for greenhouse bitter gourds, which comprises the following steps: according to an initial spectrum data set, separating light refraction paths and reflection intensity distribution characteristics caused by dew films by adopting a signal decomposition technology, extracting interference signals related to a surface tension effect, and determining a preliminary film interference component set; according to the corrected spectral signal set, a reflection characteristic vector related to the villus capillary adsorption force and the blade inclination angle is extracted, signal distribution under the wavelength dependence characteristic is analyzed, and a blade surface characteristic set after dew thin film interference is removed is obtained; and aiming at the leaf surface feature set, fusing environment humidity data and adsorption time period data, constructing a spectrum peak correlation corresponding relation corresponding to the health state of the greenhouse bitter gourd in the seedling stage, and determining a final leaf health assessment index.

This invention discloses an online detection method for coating defects in lithium-ion battery electrodes based on machine vision, belonging to the field of lithium-ion battery manufacturing quality inspection technology. Addressing the problem of missed detection of minute metallic foreign objects by conventional dry film optical detection due to insufficient contrast in high-speed coating lines, this invention deploys a piezoelectric acoustic emission sensor array in pairs on the lip plate of the coating die. Differential processing suppresses background vibrations, captures acoustic emission pulses from foreign objects, and extracts acoustic features to predict foreign object parameters. Based on the predicted parameters, a thin-film interference physical model is used to calculate the expected template for interference fringes in the downstream wet film region. The acoustic emission event triggers a downstream camera to acquire interference images at the predicted position and extract features. The expected template is matched with the actual observation, and the foreign object is confirmed, classified, and its embedding depth is evaluated through the acoustic-optical matching score. This method improves the detection sensitivity of metallic foreign objects to the 40μm level at coating speeds above 80m / min, and can identify fully embedded foreign objects that cannot be detected by purely optical methods.