22 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.

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.

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 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.

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 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 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 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.

Methods, devices and systems are described to eliminate or reduce unwanted polarization aberrations associated with interference filters. An example method for producing a polarization aberration compensator for a thin film interference filter includes obtaining a set of Mueller matrix values based on polarization measurements of the thin film interference filter over a spectral range, and generating a metric based on a difference between a compensated Mueller matrix and an identity matrix over the spectral range. The compensated matrix represents a cumulative Mueller matrix for a combination of the thin film interference filter and the polarization aberration compensator. A configuration of the polarization aberration compensator is determined based on evaluating the metric that eliminates or reduces the difference between the compensated Mueller matrix and the identity matrix over the spectral range. Configuration parameters, including thicknesses of birefringent layers, fast-axis angles and the number of birefringent layers in the compensator are obtained.

To provide a polarizing plate including an optical film which hardly causes thin film interference unevenness when formed into a laminate.SOLUTION: A polarizing plate comprising an optically anisotropic layer, an optical film, and a polarizing element, wherein the optically anisotropic layer, the optical film, and the polarizing element are arranged in this order as viewed in a thickness direction, the optical film has a thickness of 4 μm or less, and the optical film has a main surface 50nm having an arithmetic average height Sa of S1 or less, the optically anisotropic layer comprises a first phase difference layer, and the first phase difference layer has Re1 (550) of 100nm or more and 150nm or less, and Re1 (450) / Re1 (550) of 0.80 or more and 1.30 or less, wherein Re1 (550) represents an in-plane retardation at a wave length 550nm of the first phase difference layer, and Re1 (450) represents an in-plane retardation at a wave length of the first phase difference layer; 450nm. X ≥ Y (1) In Formula (1), X is a value obtained by dividing a square region having a side of 225mm included in the optical film into nine sections each having a side of 75mm and measuring thicknesses at a plurality of positions in each of the nine sections. An average value (μm) of standard deviations obtained by calculating a standard deviation of each of the nine sections and calculating an arithmetic average of the calculated nine standard deviations, Y is represented by the following formula (2), and in the formula (2), Haze represents a haze value (%) of the optical film. Y=-0.0159*Haze+0.0392(2) SELECTED DRAWING: None