71 results about "Optical index" patented technology

The invention discloses an online detection system and method for optical indexes of a hollow-core optical fiber, and relates to the technical field of optical performance detection of optical fibers, and the system comprises an optical fiber connection module, an optical performance detection module, a production linkage module and a data interaction module. The method comprises the following steps: welding the inner end of a production optical fiber with a system at one time; the industrial personal computer reads PLC production data and generates a test trigger condition; when the conditions are met, controlling the OTDR to test the optical indexes of the optical fiber; carrying out segment processing on the OTDR curve by using an improved Viterbi algorithm so as to identify fault features; performing automatic environment compensation based on an attenuation reference model established by the LSTM neural network; and finally, uploading the analysis data to a manufacturing execution system. According to the invention, on-line, real-time and accurate detection of the optical indexes of the hollow-core fiber is realized, traditional multi-time welding is replaced by one-time welding, the detection efficiency is greatly improved, and the problems of poor sealing performance, low efficiency and low data reliability in the prior art are solved.

The present application belongs to the technical field of optical fiber communication, and particularly relates to a stress measurement method and a stress measurement device. The stress measurement method comprises the steps of preparation, coupling, detection and force application. In the detection step, a detection mechanism measures a first reference value of an optical index when a coupler is formed. In the force application step, at least one taper mechanism releases the clamping of each optical fiber, and one end of a coupling area is fixed. A pulling force is applied to the other end of the coupling area in a direction away from the coupling area, a detection mechanism measures a second reference value of the optical index, the pulling force is gradually increased until the second reference value is substantially equal to the first reference value, and the value of the pulling force at this time is read to obtain the stress of the coupling area. The stress measurement method of the present application can quickly measure the stress of the coupling area.

The invention provides a large truss vibration control controlled mode selection method based on optical performance indexes, which comprises the following steps of: 1, establishing a finite element model of a large truss structure, and performing mode analysis on the large truss structure to obtain mode information of vibration of the large truss structure; 2, a linear system of the large truss structure is built through a modal superposition method; 3, calculating the dynamic response of the large truss structure under the required working condition, and obtaining the size of each order of modality under the required working condition; step 4, according to the position of the optical measurement point, establishing a calculation expression of the optical performance index under the physical coordinate, and performing quadratic form fitting; and 5, calculating the modal value of each order of modal to each optical index under the required working condition, and carrying out sorting and screening according to the modal value. According to the invention, the problem of effective mode loss caused by a traditional mode truncation method is solved.

Optical fibers are disposed within v-grooves of an optical fiber attachment region of a photonic integrated chip (PIC). A structural adhesive is disposed over a first portion of the optical fibers within the optical fiber attachment region of the PIC without being disposed over a second portion of the optical fibers within the optical fiber attachment region of the PIC. An optical index matching adhesive is disposed over the second portion of the optical fibers within the optical fiber attachment region of the PIC. A buffer structure is disposed on the structural adhesive and the optical index matching adhesive as they are cured. The buffer structure is removed. The optical fibers, the structural adhesive, and the optical index matching adhesive have a collective vertical height above a top surface of the PIC that is less than a vertical height of flip-chip attachment structures on the top surface of the PIC.

The invention discloses a precise rotary table shafting assembling and adjusting method which comprises the steps that according to a product structure and a task form corresponding to a target shafting, a rotating shaft and a mounting base are used as assembling references, assembling units are divided, a process assembling sequence is determined, and target shafting assembling is completed based on the process assembling sequence; converting the target imaging pixel difference of the assembled target shafting into an optical index corresponding to the target shafting, and converting the optical index corresponding to the target shafting into a mechanical linear parameter corresponding to the target shafting; comparing the actual shafting assembly precision with the mechanical linear parameter value, and performing process design on the assembled target bearing in response to the situation that the actual shafting assembly precision is smaller than the mechanical linear parameter value; and verifying whether the shafting assembly precision corresponding to the target bearing subjected to the process design meets a system design index or not by using an optical method, and finishing the assembly and adjustment of the target shafting under the condition that the shafting assembly precision meets the system design index. By applying the method, the assembly quality can be stabilized, and the assembly efficiency is improved.

The invention relates to a hypoperfusion oxyhemoglobin saturation detection method based on dynamic light compensation, which comprises the following steps of: constructing a combined characteristic relation based on multi-wavelength reflection intensity and fluctuation amplitude, and dynamically judging the optical sparseness of tissues, namely optical characterization of erythrocyte density in the tissues; reversely deducing the current perfusion degree through the morphological characteristics of the reflection waveform; establishing a perfusion optical index; analyzing the dynamic change trend of light reflection in a past period of time by adopting a time sequence modeling mode; an LED driving strategy is dynamically adjusted, and a light supplementing behavior similar to a physiological rhythm is formed in a step-by-step climbing mode, a pulse stimulation mode and a period maintaining mode; each light supplementing action is regarded as physiological stimulation; dynamic form similarity discrimination is introduced, whether tissue response is really caused by light supplement each time is quantified, and real physiological fluctuation and noise disturbance are distinguished; for low-response light supplement, the light supplement intensity is reduced in a feedback manner; on the contrary, key deformation features are extracted from high-response light supplement for signal reconstruction, and the signal recognition capability in the low-perfusion environment can be enhanced.

An object of the present invention is to provide a capillary electrophoresis device and an optical power diagnostic method for the same, capable of verifying optical power without requiring any specific action. Accordingly, the capillary electrophoresis device according to the present invention comprises a capillary arrangement containing a plurality of capillaries, a light source that causes laser light to oscillate, a detection unit that detects light emitted when the capillary arrangement is irradiated with the laser light, and a control unit that performs predetermined processing based on a signal emanating from the detection unit.The control unit also extracts a predetermined absolute value with respect to an optical index based on an image captured by the detection unit and calculates the optical index by comparing the extracted absolute value with a predetermined reference value.

The invention discloses a solar simulator detection method and system, relates to the field of optical systems, and is used for solving the problem of detecting optical indexes of a solar simulator. The method comprises the following steps: enabling an image plane to be positioned on a light emitting side of the solar simulator, receiving emergent light and imaging to obtain a first light field distribution image; for any pixel of the first light field distribution image, the irradiance value of the light received at the position corresponding to the pixel on the image plane is obtained according to a preset relation and the gray value of the pixel, and the preset relation describes the relation between the gray value of each pixel of the image obtained by the image plane and the irradiance value of the light received at the position corresponding to each pixel on the image plane; and obtaining an optical index of emergent light of the solar simulator according to the irradiance value corresponding to each pixel of the first light field distribution image. The emergent light of the solar simulator is imaged, the irradiance condition of the emergent light of the solar simulator is obtained according to the gray value of each pixel of the image, and then the optical index of the emergent light of the solar simulator is obtained.

This phase-quadrature interferometer (1) with polarization-maintaining optical fibers, each comprising a first axis and a second axis with different refractive indices, the interferometer (1) comprising a starting optical fiber (9) optically connecting, via its first axis, a linearly polarized laser source (3) and a first coupler (5), a reference optical fiber (11) optically connecting, via its first axis, the first coupler (5) and a second coupler (7), a measurement optical fiber (15) optically connected to the second coupler (7), a fourth optical fiber (43) and a fifth optical fiber (45) exiting the second coupler (7) to a phase-shifting module (47), and four optical sensors (49) configured to perform a phase-quadrature measurement of the light intensity received by the optical sensors (49). Figure for the abstract: Fig. 1

The invention discloses a large-view-field low-distortion infrared telecentric scanning objective lens which comprises a lens body, the lens body is composed of a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are arranged along an axis, the first lens is a positive lens, the second lens is a negative lens, the third lens is a negative lens, the fourth lens is a meniscus positive lens, and the fifth lens is a negative lens. The fifth lens is a positive lens, and the first lens and the second lens are cemented lenses. According to the invention, through combination of a plurality of lenses and the balsaming lens, high optical index, good temperature adaptability, low distortion, large target surface and large entrance pupil diameter are realized; by reasonably distributing the focal power of each lens and adopting the combination of optical materials with specific refractive index and Abbe number, various aberrations such as spherical aberration, curvature of field, chromatic aberration and the like are effectively corrected, so that high-quality imaging with system RMS wavefront less than 0.02 lambda is realized, the distortion is strictly controlled below 0.02%, and the imaging quality is greatly improved. And a sub-pixel-level accurate positioning capability is realized for high-precision machine vision and measurement detection.

A vertical-cavity surface-emitting laser (VCSEL) emitter device includes a highly-doped cap layer; and a stacked structure comprising a top surface and an edge region. The highly-doped cap layer is arranged on the top surface. The stacked structure includes a bottom distributed Bragg reflector (DBR) mirror; a top DBR mirror; an active area arranged between the top DBR mirror and the bottom DBR mirror and configured to generate laser light; and at least one oxide layer, wherein an oxide aperture is formed through the at least one oxide layer for current confinement and optical index guiding. An isolation trench is arranged at the edge region, wherein the isolation trench extends through the highly-doped cap layer and into the stacked structure, including partially into the bottom DBR mirror, and wherein the isolation trench is configured to block current from spreading into the edge region via the highly-doped cap layer.

The invention relates to the technical field of spaceflight, in particular to a design method and device of a spaceflight optical load and a computer program product. The design method of the spaceflight optical load comprises the following steps: determining the emphasis dimension of a to-be-designed optical load according to a received task demand, and determining an optical weight, a mechanical weight and a thermal control weight based on the emphasis dimension; determining a performance optimization objective function according to the optical weight, the mechanical weight, the thermal control weight, the optical index, the mechanical index and the thermal control index; and performing simulation design on the optical load based on a simulation model and the task demand, and optimizing the simulation design at least based on the performance optimization objective function.

The invention discloses an optical index testing method and device, wearable display equipment and a storage medium, and the method comprises the steps: carrying out the shooting of a test graphic card at different visual angles, and obtaining at least two to-be-spliced images; aligning the images to be spliced to form an overlapping region; the image gradual change direction of each repeated image in the overlapping area is determined, and the image gradual change direction is the direction from the to-be-spliced image side from which the repeated image comes to the other adjacent to-be-spliced image side; the pixel values of the corresponding repeated images are gradually reduced in the overlapping area according to the image gradual change direction, the pixel values of the repeated images are overlapped, a spliced image is generated, and the overlapped pixel values of the repeated images in the overlapping area are consistent with the pixel values of the to-be-spliced images; the optical index is tested according to the spliced image, so that an obvious boundary trace is prevented from appearing at the splicing line of the overlapped region, and the accuracy of the optical index test is effectively improved.

This invention discloses a method and apparatus for extracting rice information based on multi-source remote sensing and machine learning. First, rice is extracted from Sentinel-1 and Sentinel-2 images using rice indices and optical indices, respectively. The union of the extraction results forms a potential rice distribution map. Pixels are extracted from the distribution map and the areas outside the distribution map as labels for rice and non-rice samples. The VH time-series values ​​and SWIR1 band reflectance of each labeled sample point are extracted from the Sentinel-1 and Sentinel-2 images, respectively, and training sets are constructed to train two classification models. Images of the study area are acquired, and the rice probability distribution is obtained using the corresponding classification models and weighted fusion is performed. Data from a statistical yearbook is used to constrain the area of ​​the obtained probability distribution map, and the optimal probability threshold is obtained for rice extraction from the probability distribution map. This invention can achieve high-precision regional rice mapping using free imagery.

The present invention discloses a method for analyzing polarized image information, a system, an electronic device, and a computer-readable storage medium. These methods, which fall within the field of optics, primarily target materials exhibiting birefringence. By comprehensively considering all factors, including the light source, material absorption / emission, birefringence, and the provision of additional optical path difference devices in the optical path, the method reproduces the sample's color and texture, revealing the material's optical properties and molecular arrangement characteristics. These methods, including optical index, birefringence, color, and molecular director distribution, provide quantitative analysis tools for polymer crystallization / orientation, liquid crystal texture analysis, and biofilm analysis. These methods can be applied to material microstructure and performance studies, including analysis of color distortion caused by design flaws in liquid crystal displays, liquid crystal spatial light modulators, and active-matrix organic light-emitting diode displays. Furthermore, in the production of polymer materials using stretching processes, this method can also monitor and analyze properties such as the order parameter and birefringence of oriented polymers in real time.

The invention discloses a rice information extraction method and equipment based on multi-source remote sensing and machine learning, and the method comprises the steps: firstly extracting rice from a Sentinel-1 image and a Sentinel-2 image through employing a rice index and an optical index, and obtaining a union set of extraction results to form a potential rice distribution diagram; respectively extracting pixels from the distribution map and the area outside the distribution map as rice and non-rice sample labels; respectively extracting a VH time sequence value and SWIT1 wave band reflectivity of each label sample point on the Sentinel-1 image and the Sentinel-2 image, and respectively constructing training sets to train two classification models; and obtaining an image of a research area, obtaining rice probability distribution by using a corresponding classification model, performing weighted fusion, performing area constraint on an obtained probability distribution diagram by using data of statistical yearbook, and obtaining an optimal probability threshold to perform rice extraction on the probability distribution diagram. According to the method, regional high-precision rice drawing can be realized by using free images.

The embodiment of the utility model provides an optical film assembly, a backlight module and a display device, and the optical film assembly comprises an optical film which comprises a first prism layer; the polaroid comprises a body diffusion layer, air holes are formed in the body diffusion layer so as to reflect and refract light rays, and at least one side face of the body diffusion layer is a flat surface so as to be tightly connected with the first prism layer. The air holes in the diffusion layer are used in the polaroid to diffuse light rays, existing diffusion coating particles are replaced, the particles can be prevented from scratching the prism layer, and therefore the probability that the optical film is abraded is reduced, optical devices are reduced on the basis that the optical index requirement of the polaroid is guaranteed, and the thickness of the backlight module is reduced.

The present invention provides an optical film containing a polymer resin, the polymer resin comprising a first repeating unit, a second repeating unit, a third repeating unit, and a fourth repeating unit, wherein the optical index of the film is 1.0% / GU or more, the first repeating unit is an imide repeating unit derived from a first diamine compound and a dianhydride compound, the second repeating unit is an imide repeating unit derived from a second diamine compound and a dianhydride compound, the third repeating unit is an amide repeating unit derived from a first diamine compound and a dicarbonyl compound, the fourth repeating unit is an amide repeating unit derived from a second diamine compound and a dicarbonyl compound, the first diamine compound is 2,2′-bis(trifluoromethyl)benzidine (TFDB), the second diamine compound includes an aromatic diamine compound, and the third repeating unit and the fourth repeating unit are included in a proportion of 80% or more relative to the total number of repeating units including the first to fourth repeating units.

Optical fibers are disposed within v-grooves of an optical fiber attachment region of a photonic integrated chip (PIC). A structural adhesive is disposed over a first portion of the optical fibers within the optical fiber attachment region of the PIC without being disposed over a second portion of the optical fibers within the optical fiber attachment region of the PIC. An optical index matching adhesive is disposed over the second portion of the optical fibers within the optical fiber attachment region of the PIC. A buffer structure is disposed on the structural adhesive and the optical index matching adhesive as they are cured. The buffer structure is removed. The optical fibers, the structural adhesive, and the optical index matching adhesive have a collective vertical height above a top surface of the PIC that is less than a vertical height of flip-chip attachment structures on the top surface of the PIC.

The invention belongs to the technical field of laser detection, and discloses a myriawatt-level optical parameter measurement system which comprises a detection assembly and a light splitting assembly. The detection assembly comprises a first detection unit, a second detection unit, a third detection unit and a fourth detection unit. The light splitting assembly is used for receiving an original light beam emitted by a fiber laser, and the light splitting assembly comprises multiple stages of light splitting elements arranged along a light path so as to split the original light beam into at least four paths of detection light beams; the first detection light beam enters the first detection unit, the second detection light beam enters the second detection unit, the third detection light beam enters the third detection unit, and the fourth detection light beam enters the fourth detection unit. The device can synchronously test multiple key optical indexes of the fiber laser, and is simple in structure, accurate in result and high in stability.

A non-linear optical crystal includes a nanostructured optical surface including distributed pillars and voids to provide anti-reflection and scatter control of light incident on an optical surface. The crystal with the anti-reflective structured optical surface may be a monolithic structure and thus need not include a coating of an anti-reflective (AR) material. The pillars and gaps may be randomly distributed on the optical surface to form a gradient optical index.

The application provides a building outer wall defect detection method and system based on acousto-optic-thermal multi-physical field coupling, and relates to the technical field of intelligent nondestructive testing. The method comprises the following steps: according to the comparison result between the optical indexes of each region in the building outer wall image and the index conditions, candidate regions with defects are selected from multiple regions of the building outer wall image; a temperature change sequence of each pixel point collected during the application of sound excitation and thermal excitation to the outer wall region corresponding to the candidate region is obtained; time-frequency transformation and phase-locked analysis are performed on the temperature change sequence of each pixel point to obtain the thermal-acoustic coupling parameter and resonance intensity parameter of each pixel point; the defect type to which each pixel point belongs is determined; for multiple pixel points with the defect type of hollowing in the candidate region, based on the preset calibration relationship between the resonance peak feature and the hollowing depth and the bonding stiffness, the hollowing depth and the bonding stiffness are obtained by inversion according to the resonance peak feature of the multiple pixel points.

The present invention discloses a method for formulating thermal control indexes of a space remote sensor based on a force-thermal coupling algorithm, including: establishing four assumed working conditions of force-thermal coupling; calculating the value of MTF according to the force-thermal coupling elastic deformation theory and the conversion relationship between the opto-mechanical structure deformation and the optical system to quantitatively evaluate the imaging quality; determining the corresponding comprehensive imaging quality index under the coupling of the thermal control subsystem and the mechanical subsystem of the remote sensor according to the relationship between the overall index and the subsystem index of the imaging quality; performing iterative calculation on the coupling working condition and taking the temperature corresponding to when the imaging quality threshold is reached as the thermal control index to complete the conversion from the optical index to the thermal control index. The indexes of the present invention can reduce the power consumption of the thermal control system by about 20% and shorten the development cycle of the remote sensor to a certain extent while ensuring that the imaging quality of the remote sensor in orbit meets the indexes.

The utility model relates to the technical field of production line optical index testing, and particularly discloses an auxiliary fixing device for optical index testing, which comprises a fixing seat, a first upright post and a product fixing piece, the first stand columns are fixed to the fixing base, and each first stand column is provided with a plurality of product fixing pieces. The product fixing piece is vertically connected to the first stand column in a sliding mode, and the product fixing piece can be positioned, locked and fixed to the first stand column through a bolt; the test fixing device can be compatible with fixation of test products of more models or sizes, corresponding test fixing devices do not need to be produced for different test products, cost is saved, and production benefits are improved; according to different sizes of products, the distance between the power supply fixing piece and the network port fixing piece is adjusted, multiple to-be-tested products can be inserted at the same time for testing, and efficient optical index testing is carried out on the test by matching with a testing instrument.

The invention provides a light environment model construction method and device, equipment and a storage medium, and relates to the technical field of optics, and the specific implementation scheme is as follows: obtaining scene feature information corresponding to a target light environment scene; according to the scene feature information, obtaining an overall optical representation graph of the target light environment scene, wherein the pixel value of each pixel point in the overall optical representation graph represents the optical index of the corresponding scene position; partitioning the overall light distribution image, and determining feature points of each partition; and for each partition, obtaining an optical index association relationship between the feature points and association points in the partition, and obtaining a scene light environment model. Through the implementation of the scheme of the invention, the optical indexes of all scene positions in the light environment scene are comprehensively represented, and then the optical index association relationship between the feature points and all the association points in the partitions is established for each scene region, so that the information amount of the scene light environment model is enriched, the generalization ability of the model is effectively improved, and the user experience is improved. And the practicability of the model is expanded.

The invention relates to a pose-adjustable collimator platform, belongs to the technical field of optical detection, and is used for solving the problems of high external field detection cost and low precision of large-caliber and wide-view-field optical remote sensing equipment. The platform comprises a collimator, a frame, a multi-linkage lifting device and a course adjusting mechanism, and the multi-linkage lifting device is arranged on the frame and can move up and down relative to the frame; the course adjusting mechanism is arranged on the multi-linkage lifting device and can rotate around a shaft in the vertical direction relative to the multi-linkage lifting device; and the collimator is fixedly arranged on the course adjusting mechanism. The collimator platform is of an overall frame structure, small in size, light in weight and convenient to transport, the requirements for the caliber of the collimator and the size of a view field are reduced, then the production cost is reduced, the detection precision is improved, it is ensured that multiple optical indexes of optical remote sensing equipment are detected and calibrated accurately, and the collimator platform has wide application prospects.

A passive cooler of the disclosure includes a thermal emitter having a substrate and a coating disposed on at least a portion of a first side of the substrate. The cooler has a beam guide made from a material having a high absorption to solar wavelengths and high reflectance at mid-infrared wavelengths. The beam guide is configured such that at least a portion of incident light is acted on by the beam guide before reaching the thermal emitter. In some embodiments, the beam guide has a graded optical index.

The invention provides a building outer wall defect detection method and system based on acousto-optic-thermal multi-physics field coupling, and relates to the technical field of intelligent nondestructive testing. The method comprises the following steps: screening candidate areas with defects from a plurality of areas of a building outer wall image according to a comparison result between an optical index and an index condition of each area in the building outer wall image; acquiring a temperature change sequence of each pixel point acquired during the period of applying acoustic excitation and thermal excitation to the outer wall region corresponding to the candidate region; performing time-frequency transformation and phase lock analysis on the temperature change sequence of each pixel point to obtain a thermoacoustic coupling parameter and a resonance intensity parameter of each pixel point; determining a defect type to which each pixel point belongs; and for the plurality of pixel points of which the defect types are hollowing in the candidate region, based on a preset calibration relationship between the formant characteristics and the hollowing depth and the bonding stiffness, carrying out inversion according to the formant characteristics of the plurality of pixel points to obtain the hollowing depth and the bonding stiffness.

The present invention provides an optical film comprising a polymer resin, which comprises a first repeating unit, a second repeating unit, a third repeating unit and a fourth repeating unit, wherein the optical index of the film is 1.0% / GU or more, the first repeating unit is an imide repeating unit derived from a first diamine-based compound and a dianhydride-based compound, the second repeating unit is an imide-repeating unit derived from a second diamine-based compound and a dianhydride-based compound, the third repeating unit is an amide-repeating unit derived from a first diamine-based compound and a dicarbonyl-based compound, the fourth repeating unit is an amide-repeating unit derived from a second diamine-based compound and a dicarbonyl-based compound, the first diamine-based compound is 2,2′-bis(trifluoromethyl)benzidine (TFDB), the second diamine-based compound includes an aromatic diamine-based compound, and the third repeating unit and the fourth repeating unit are included in a proportion of 80% or more with respect to the total number of the repeating units comprising the first to fourth repeating units.

The invention discloses a binocular AA image combination device for XR device research and development experiments, and relates to the technical field of image combination devices, the binocular AA image combination device comprises a rack, a control system arranged on the rack, and an image acquisition module electrically connected with the control system; the jig bearing table is arranged in the working area of the rack and used for bearing a to-be-assembled mirror frame; the number of the six-degree-of-freedom adjusting modules is two. According to the method, the binocular image combination deviation value is used as a core control variable, and the conversion from optical index priority to wearing comfort priority is realized by using a global evaluation model; when conflicts occur, the system actively sacrifices trace monocular definition, and the binocular visual axis deviation is forcibly corrected, so that the research and development model machine is ensured to accord with the physiological tolerance limit of human eyes; by simulating a binocular fusion mechanism of human eyes at an equipment end, research and development personnel can directly find whether an image combination dead zone exists in optical design or not in an assembly stage, so that the condition of repair after operation is avoided.