12 results about "Reflectance factor" patented technology

The present invention relates to an optical lens comprising a substrate and a multi-layer antireflection coating provided on at least one of the main surfaces of the substrate and comprising a stack of at least one layer having a high refractive index and at least one layer having a low refractive index, a spectral reflectance curve of the multi-layer antireflection coating for an angle of incidence in the range of 0 DEG to 15 DEG has a reflection peak centered on a wavelength in the range of 435-450 nm and having a maximum reflectance of less than or equal to 30% and a full width at half maximum of less than or equal to 90 nm, and a local reflectance minimum in the range of 380-420 nm of less than or equal to 2% and a multi-layer antireflection coating for the at least one major surface, the multi-layer antireflection coating providing the at least one major surface with: for an angle of incidence in the range of 0 to 15 degrees, the present invention relates to a light-emitting device comprising a light-emitting element, a light-emitting element, an average light reflection factor Rv of 380 nm to 780 nm of less than or equal to 2.5%, an average blue light reflection factor RmB1 of greater than or equal to 15% in the wavelength range of 420 nm to 450 nm of greater than or equal to 15%, an average blue light reflection factor RmB3 of greater than or equal to 15% in the wavelength range of 440 nm to 460 nm of greater than or equal to 15%, and a ratio RmB1 / RmB3 of less than or equal to 1.

This invention provides a curvewave domain-based method for removing strong axes based on reflection coefficient attribute volumes, relating to the field of seismic data processing technology. The method includes: performing spectral inversion processing on raw seismic data to generate a reflection coefficient volume; based on the reflection coefficient volume, performing multi-scale, multi-directional layer-by-layer analysis in the curvewave domain, i.e., extracting reflection coefficient curves for each analysis window, determining inflection point locations by calculating the zero point of the second derivative of the curves to identify abrupt changes in the reflection coefficient; simultaneously, constructing local discrete surfaces based on the reflection coefficient volume, identifying local geometric anomaly regions of the reflection coefficient volume by fitting surface patches and calculating Gaussian curvature; and extracting strong reflection coefficient components by combining the determined inflection point locations and the identified local geometric anomaly regions. This invention can achieve precise stripping of strong reflection energy and faithful protection of effective weak signals, improving the reliability of seismic data in identifying and analyzing subsurface lithology and geological structures.

The application discloses a least square reverse-time migration imaging method, device, equipment and medium, and relates to the technical field of geophysical exploration.The application is characterized in that, in the process of capturing the second-order curvature information of a target function at a current iteration point based on the gradient of the target function in the current iteration of a reflection coefficient model, an adjustable weight parameter is used to perform convex combination on a quasi-Newton equation capable of matching the gradient to the target function value in iteration and a quasi-Newton equation directly using an adaptive weight parameter to adjust the reflection system model update amount in iteration, so that the second-order curvature information of the target function at the current iteration point can be captured more accurately at a higher convergence speed, the calculation efficiency is greatly improved by combining the adaptive weight parameter, and finally high-precision migration imaging is performed.

The invention discloses a satellite-borne GNSS-R soil humidity inversion method based on a Fresnel reflection coefficient, and belongs to the field of satellite-borne GNSS-R soil humidity remote sensing monitoring, and the method comprises the steps: obtaining satellite-borne GNSS-R observation data, and carrying out the preprocessing; eliminating satellite-borne GNSS-R observation data influenced by a water body by adopting a water body elimination method; fitting to obtain a Fresnel reflection coefficient correction function based on different satellite signal incidence angles and environmental parameters; correcting the original surface reflectance by using the Fresnel reflection coefficient correction function to obtain the corrected surface reflectance; and establishing a linear inversion equation based on the corrected surface reflectance and soil humidity reference product data to realize soil humidity inversion. According to the method, water body interference is effectively eliminated, the influence of multiple factors on the Fresnel reflection coefficient is weakened, the soil humidity inversion precision and stability are improved, the sampling point number advantage is remarkable, and reliable technical support is provided for dynamic monitoring of the soil humidity.

The present application is suitable for oil and gas geophysical exploration technical field, provide a kind of stratum attenuation factor time-frequency domain prestack seismic inversion method and system, the method includes the following steps: construct about longitudinal, transverse wave attenuation factor frequency domain AVO formula, propose the collaborative inversion strategy of joint time-frequency domain seismic data real part and imaginary part information;Input partial stack seismic data and carry out spectral decomposition, obtain time-frequency domain seismic data;According to the real part of time-frequency domain data, the frequency variable longitudinal, transverse wave modulus reflectivity is calculated;According to the imaginary part of time-frequency domain data, construct the time-frequency spectrum of imaginary part reflectivity difference;With the real part inversion result as prior information, in combination with the spectrum of seismic wavelet, the frequency variable longitudinal, transverse wave attenuation factor frequency gradient attribute is inverted, and the longitudinal, transverse wave attenuation factor is calculated by frequency integration.This method uses the real part and imaginary part information of time-frequency domain seismic data, and provides an effective method for calculating stratum attenuation factor by "real part-imaginary part" hierarchical inversion strategy.

The invention relates to a secured document (100) comprising: a substrate (101) partially covered in at least two, preferably non-overlapping regions with an additional layer, wherein a first effect layer (104) made of a material susceptible to deformation under the influence of an external pressure force and reflecting light, having a high light reflectance coefficient, is applied to at least a first substrate region (106), and a second print layer (103) made of a reflective, color, high-viscosity coating material, which modifies the substrate (101), is applied to at least a second substrate region (107); and wherein on at least the first region (106) of the substrate there is a first security element (102) which is an embossed optical element (108) comprising an embossed structure made by the gravure method in the form of a grid (400) of cells (401), preferably equilateral cells, most preferably square cells, wherein a single cell (401) corresponds to a single point of the first security element (102) forming, together with the remaining points of the grid, a globally perceptible, information-bearing first security element (102), and in which cells (401) there are sub-images (403) formed by convex embossed lines (402) parallel to the remaining ones present in the cell, having a predetermined height (h) in relation to the surface of the substrate (101) between the lines (402), modified with a material susceptible to deformation under the influence of an external pressure force and reflecting light, having a high light reflectance coefficient, which lines (402) in each of the cells (401) of the grid (400) are parallel to each other, and the angle of inclination of the lines relative to the selected axis of symmetry, identical for all cells, of the first security element (102) defined in the plane of the substrate (101) is constant within each of the cells (401) of the grid (400) and varies within the range from 1 to 180°, and the number of lines (402) in each of the cells (401) of the grid (400) is equal to or greater than three and the maximum distance measured between the most distant points of each of the cells (401) does not exceed 1 mm, preferably is less than 0.7 mm, more preferably is less than 0.5 mm and most preferably is less than 0.1 mm.

The invention relates to a secured document (100) comprising: a substrate (101) partially covered in at least two, preferably non-overlapping regions with an additional layer, wherein a first effect layer (104) made of a material susceptible to deformation under the influence of an external pressure force and reflecting light, having a high light reflectance coefficient, is applied to at least a first substrate region (106), and a second print layer (103) made of a reflective, color, high-viscosity coating material, which modifies the substrate (101), is applied to at least a second substrate region (107); and wherein on at least the first region (106) of the substrate there is a first security element (102) which is an embossed optical element (108) comprising an embossed structure made by the gravure method in the form of a grid (400) of cells (401), preferably equilateral cells, most preferably square cells, wherein a single cell (401) corresponds to a single point of the first security element (102) forming, together with the remaining points of the grid, a globally perceptible, information-bearing first security element (102), and in which cells (401) there are sub-images (403) formed by convex embossed lines (402) parallel to the remaining ones present in the cell, having a predetermined height (h) in relation to the surface of the substrate (101) between the lines (402), modified with a material susceptible to deformation under the influence of an external pressure force and reflecting light, having a high light reflectance coefficient, which lines (402) in each of the cells (401) of the grid (400) are parallel to each other, and the angle of inclination of the lines relative to the selected axis of symmetry, identical for all cells, of the first security element (102) defined in the plane of the substrate (101) is constant within each of the cells (401) of the grid (400) and varies within the range from 1 to 180°, and the number of lines (402) in each of the cells (401) of the grid (400) is equal to or greater than three and the maximum distance measured between the most distant points of each of the cells (401) does not exceed 1 mm, preferably is less than 0.7 mm, more preferably is less than 0.5 mm and most preferably is less than 0.1 mm.

The application provides an image gray estimation method and system, computer equipment and a storage medium, and belongs to the field of image processing, and comprises the following steps: projecting light stripes to a plane where a calibration plate is located, and calibrating plane equations of the light stripes; projecting multiple structure lights to a surface of a measured tubular object, collecting reflected light of the measured tubular object, and extracting light stripe centers; calibrating relative values of surface reflection coefficients of the measured tubular object plane, and obtaining multiple surface reflection coefficient values of the surface of the measured tubular object; taking mean values of the multiple reflection coefficients, and calculating a theoretical gray value of the surface of the measured tubular object according to the mean values of the multiple reflection coefficients. The application can accurately estimate the gray distribution of the surface of the object under specific illumination conditions by using optical simulation, better simulates and optimizes influences of illumination, reflection and other factors on image gray, provides more reliable data support for defect detection of the tubular object, and improves the precision and robustness of the structure light three-dimensional scanning.

This invention relates to the field of optical detection, specifically to a universal method and device for detecting the focal length of a human eye based on the ciliary body. The method includes: obtaining the focal length of a sample group at different standard focal lengths f1 to f2. m The OCT light signal set of the ciliary body region was collected, and each different site M1 to M2 was extracted from the OCT light signal set. n Points P1 to P2 in different layers i The sample light reflectance coefficients, after normalization transformation, are used to obtain different standard focal lengths f1 to f2. m The invention obtains the "feature point-sample mean light reflectance coefficient curve" and the "feature point-measured light reflectance coefficient curve" for any focal length of the subject, and fits it with the "feature point-sample mean light reflectance coefficient curve" to obtain the measured focal length value of the subject. This invention achieves universal detection of the human eye's actual focal length based on the ciliary body, avoiding eye discomfort caused by laser irradiation of the lens, allowing the subject to enjoy a better testing experience with less eye stimulation, and further making focal length detection more accurate.

The invention discloses a least square reverse time migration imaging method and device, equipment and a medium, and relates to the technical field of geophysical exploration. In the process of capturing the second-order curvature information of an objective function at a current iteration point based on the gradient of the objective function in the current iteration of a reflection coefficient model, the second-order curvature information of the objective function at the current iteration point is obtained through adjustable weight parameters; according to the method, a quasi-Newton equation capable of matching a gradient with an objective function value in iteration and a quasi-Newton equation capable of directly adjusting the updating quantity of a reflection system model by using a ratio parameter in iteration are subjected to convex combination, and the gradient can be used for matching the objective function value in iteration in the process; according to the method, the updating amount of the reflection system model is adjusted by directly utilizing the self-adaptive ratio adjustment parameter, and the addition combination in the process is weight self-adaptive combination, so that the second-order curvature information of the target function at the current iteration point can be more accurately captured at a higher convergence speed, and the calculation efficiency is greatly improved by combining the self-adaptive ratio adjustment parameter; and finally, high-precision migration imaging is carried out.

The application belongs to the technical field of thermal reflectance coefficient measurement, and discloses a micro-region thermal reflectance coefficient in-situ calibration method and system. The application obtains an offline calibration curve corresponding to a micro-region of a target device, and the offline calibration curve is a function relationship between a temperature-sensitive electrical parameter and a junction temperature; in-situ synchronous measurement is performed on the target device to obtain in-situ measurement information corresponding to the micro-region; the in-situ measurement information includes optical reflectivity signals and temperature-sensitive electrical parameter signals corresponding to at least two different stable temperatures of the micro-region; and the thermal reflectance coefficient of the micro-region is calculated by combining the in-situ measurement information and the offline calibration curve. The application can realize in-situ calibration of the thermal reflectance coefficient in the micro-region.

The application discloses an optical lens surface scratch detection method and device and a medium, and relates to the technical field of image processing. The method comprises the following steps: under the condition that the pose of an optical lens is kept unchanged, the surface of the optical lens is illuminated from different known directions, corresponding surface reflection images under each illumination direction are collected and recorded, and a reflection image sequence is obtained; a reflectivity inversion model is constructed based on the reflection image sequence and a geometric normal map, the geometric normal map and the reflection image sequence are input into the reflectivity inversion model, and a diffuse reflection coefficient map and a specular reflection coefficient map of the surface of the optical lens are output; geometric gradient features of the surface of the optical lens are calculated based on the geometric normal map, and optical property deviation features of the surface of the optical lens are calculated based on the diffuse reflection coefficient map and the specular reflection coefficient map; the geometric gradient features and the optical property deviation features are fused, and a scratch detection report is generated in combination with an absolute phase map. The application realizes linear screening and physical size quantization of scratches.