16 results about "Spectral transmittance" patented technology

This invention discloses a rapid calculation method for the rearward infrared radiation intensity of an S-curve nozzle, belonging to the field of infrared radiation characteristic simulation of aero-engine exhaust systems. The method comprises the following steps: determining the design parameters of the S-curve nozzle and exhaust mixer components; establishing projection models of the key shielding sections of the exhaust mixer and S-curve nozzle; calculating the projected area of ​​each component after shielding by the S-curve nozzle using an image method; calculating the flow field parameter distribution and component surface temperature of the S-curve nozzle; calculating the axial length and volume of the visible region of the exhaust gas in the S-curve nozzle; calculating the spectral transmittance and spectral radiance of the exhaust gas along the nozzle outlet centerline within the visible region of the exhaust gas, as well as the spectral radiance intensity of the exhaust gas; calculating the infrared spectral radiance intensity of the wall surface; and integrating the spectral radiance to obtain the total infrared radiation intensity. This method solves the problems of existing technologies where the simulation calculation of the infrared radiation characteristics of S-curve nozzles is complex and time-consuming, and rapid calculation methods are only applicable to axisymmetric nozzles and cannot simulate the shielding structural characteristics of S-curve nozzles.

This invention relates to a filter having a substrate and a dielectric multilayer film laminated on at least one main surface of the substrate as the outermost layer, wherein the substrate comprises a resin film comprising resin and a pigment (A), the pigment (A) being a near-infrared absorbing pigment, and the pigment (A) satisfies specific spectral characteristics in the spectral transmittance curve of a coated film obtained by dissolving the pigment (A) in the resin and coating it onto an alkali glass plate.

This invention discloses a method and system for online determination of the surface processing status of silicon carbide wafers, belonging to the field of silicon carbide processing technology. The method provided by this invention includes the following steps: providing a silicon carbide wafer to be tested, the wafer having completed at least one polishing process; measuring the online spectral transmittance data T of the silicon carbide wafer at a predetermined visible light wavelength in a non-contact manner at a detection station; comparing the online spectral transmittance data T with a judgment threshold pre-stored in a database in real time, the judgment threshold being associated with different surface processing statuses of the silicon carbide wafer; based on the comparison result, outputting the surface processing status determination result of the silicon carbide wafer to be tested in real time, and generating corresponding production flow control instructions. This invention, by measuring the spectral transmittance in the visible light band and directly associating it with a pre-stored process status judgment threshold, achieves online, rapid, non-destructive determination and automatic sorting of the processing status of silicon carbide wafers on the polishing production line.

This optical film includes, on at least one surface of a resin base material, a primer layer and an optical functional layer, in that order. The value of a hue a* of SCE reflection light is -2.0 to +2.0, and the value of a hue b* of the SCE reflection light is -3.0 to +3.0. Preferably, the optical film has a spectral transmittance of 67.0% or less at a wavelength of 390 nm and 86.0% or less at a wavelength of 400 nm. Preferably, the optical functional layer of the optical film is a UV-blocking hard coat layer. Preferably, the film thickness of the primer layer of the optical film is 70 nm to 120 nm.

This invention discloses a method and system for testing atmospheric spectral transmittance based on gas absorption spectra, belonging to the field of aero-engine target radiation characteristic measurement technology. It solves the technical problems of high requirements for blackbody size and temperature consistency, cumbersome processes, and low accuracy in atmospheric transmittance testing. The testing system includes a blackbody, a collimation system, and a spectroradiometer. The collimation system is located between the blackbody and the spectroradiometer to increase the testing distance for atmospheric spectral transmittance. The testing method includes the following steps: baseline fitting and gas absorption spectrum extraction, characteristic absorption peak classification and experimental absorption spectrum area calculation, establishment of a forward spectral energy evolution model and simulated absorption spectrum area calculation, determination of atmospheric temperature and concentration along the transmission path, determination of concentration along the transmission path, and calculation of atmospheric spectral transmittance distribution along the measurement path, considering the coupling instrument function effect. This invention is used for measuring the radiation characteristics of aero-engine targets.

This invention discloses a method and system for detecting microalgae concentration and pigments based on multispectral attenuation inversion. The method includes: establishing a nonlinear light attenuation model, whose inputs are the chlorophyll a content, chlorophyll b content, carotenoid content, and microalgae concentration, and whose output is the corresponding spectral transmittance; presetting bio-realism constraints based on the physiological characteristics of microalgae and physical constraints based on the physical laws of spectral detection; acquiring measured spectral transmittance data of the microalgae sample under different spectra; combining the bio-realism constraints and physical constraints, using a nonlinear optimization algorithm to invert and solve the nonlinear light attenuation model, and calculating the chlorophyll a content, chlorophyll b content, carotenoid content, and microalgae concentration that meet the constraints using the measured spectral transmittance data as the objective. This invention improves the accuracy and bio-reasonableness of microalgae detection through multispectral coupling and constraint optimization.

This suppresses the increased burden of alignment when mounting bandpass filters with curved shapes. [Solution] The bandpass filter comprises a curved light-transmitting portion, a spectral transmittance control layer provided on the light-transmitting portion, and a support portion extending from the light-transmitting portion and supporting the light-transmitting portion. The light-transmitting portion may be set to a curvature corresponding to the CRA (Chief Ray Angle) of the sensor surface on which the light transmitted through the light-transmitting portion is incident. The support portion may have a flat surface located around the light-transmitting portion. Alignment marks may be located on the support portion.

This invention discloses a process for fabricating a large aspect ratio tubular tool with a conductive annular light-guiding film, comprising the following steps: S100: Using a mixed gas with high infrared spectral transmittance as raw material, a hollow tool mother tube is prepared. S200: The hollow tool mother tube is softened and shrunk under negative pressure to obtain the target hollow tool mother tube. S300: The target hollow tool mother tube is subjected to pressure-holding drawing, and the inner and outer diameters of the hollow tubular light guide tube obtained by pressure-holding drawing are fed back through real-time online measurement, and the drawing pressure is adjusted in real time to finally obtain the finished hollow tubular light guide tube of the target size. S400: A metal layer is deposited on the inner wall of the finished hollow tubular light guide tube, and an optical exit structure is processed on the tube end face of the finished hollow tubular light guide tube, thereby obtaining a large aspect ratio tubular tool. This invention can fabricate a large aspect ratio tubular tool with a conductive annular light-guiding film of the target size, and during the fabrication process, the size of the large aspect ratio tubular tool can be quantitatively controlled and is not prone to cracking.

A metal member (1) has: a substrate (2) composed of a metal; a transparent layer (3) provided on the substrate (2) and being composed of a material that transmits visible light; and a reflective layer (4) provided on the transparent layer (3). The mean value of the spectral transmittance of the reflective layer, in the wavelength range of 400 nm or longer and 700 nm or shorter, is 2% or more and 80% or less. In addition, the reflective layer (4) is constituted such that a portion of the visible light that is incident on the reflective layer (4) is reflectable. The metal member (1) can be obtained by performing an anodizing treatment on the substrate (2) in a weakly acidic or weakly basic electrolytic solution to form the transparent layer (3), and then performing a sputtering treatment to form the reflective layer (4) on the transparent layer (3).

Calibrating a spectral imaging device includesproviding first calibration light, with first calibration spectrum (IMPBF),coupling the first calibration light to the device,obtaining a first measured profile of the first calibration light by recording first detector pixel signals during scanning a control parameter of a Fabry-Perot interferometer of the device,obtaining a second measured profile of the first calibration light by recording second detector pixel signals during scanning,determining a first simulated profile from the first calibration spectrum using previously measured spectral quantum efficiency of first detector pixels, previously measured spectral transmittance function, and first calibration data,determining a second simulated profile from the first calibration spectrum using previously measured spectral quantum efficiency of second detector pixels, previously measured spectral transmittance function, and the first calibration data, andmodifying first calibration data until simulated profiles match with corresponding measured profiles.

The application provides a light source selection method and device based on chroma pigment transmittance, equipment and medium, which can be applied to the fields of cultural relic protection and spectral analysis technology. The light source selection method based on chroma pigment transmittance comprises the following steps: acquiring spectral power distribution of a plurality of candidate light sources for illuminating a painted cultural relic, and a plurality of pigment types of a target chroma part on the painted cultural relic and thicknesses of pigment layers corresponding to the plurality of pigment types; selecting a target spectral transmittance model of each of the plurality of pigment types according to the identification of the plurality of pigment types; inputting the spectral power distribution and the thicknesses of the pigment layers into the target spectral transmittance model of each of the pigment types to output spectral transmittance of each of the pigment types to the candidate light sources; predicting transmission power of the candidate light sources through the pigment layers according to the spectral transmittance of each of the pigment types and the spectral power distribution of the candidate light sources; and selecting a target light source according to the transmission power.

Disclosed is a method for determining a filter for a visual equipment to be placed in front of the eye of a user to improve visual comfort and / or visual performance of the user, the method including: determining the spectral transmittance of an ocular media of an eye; and determining a filter based on the determined spectral transmittance of the ocular media so the filter has a spectral transmittance profile including: a first portion having a maximum transmittance value between 380 nm and a predetermined threshold, and a second portion with a decreasing transmittance value between the threshold and 670 nm. Also disclosed is a filter whose spectral transmittance is calculated based on the spectral transmittance of the user's ocular media, as well as a set of filters with each filter in the set having a spectral transmittance based on the spectral transmittance of the ocular media of users having different ages.

The invention discloses a method for testing the sunlight blocking rate of a textile, belongs to the technical field of optical performance testing of textile materials, and aims to solve the core problems of poor reproducibility and comparability of a test result caused by splitting of a test wave band, serious distortion of the test result of a fluorescent textile and lack of calculation specifications in the prior art. The method comprises the following steps: firstly, carrying out fluorescence attribute discrimination on a to-be-detected textile, and classifying and acquiring effective spectral transmittance of full wave bands of 280-2500 nm based on a discrimination result; aiming at the textile containing the fluorescent substance, the interference of fluorescence emission light on the test is effectively eliminated by adopting a sub-band isolation measurement method; standard solar spectrum irradiance data subjected to standardization processing is adopted as a weighting parameter, and a sunlight blocking rate result is output after weighted average calculation and standardization modification. The method realizes integrated scientific evaluation of the total solar spectrum barrier property of the textile, is accurate and reliable in test result, and can be widely applied to standardized detection of the sunlight barrier property of various textiles.

The application relates to the fields of infrared optical film technology and precise photoelectric testing technology, and provides an attenuating piece, a preparation method, an attenuating piece wheel assembly, a testing system and a testing method. The application utilizes a first attenuating piece group and a second attenuating piece group to form an attenuating piece, each first attenuating piece in the first attenuating piece group adopts a zinc selenide base material and a nickel film and has high spectral transmittance; each second attenuating piece in the second attenuating piece group adopts a silicon base material, a gold film and a chromium adhesion layer and has high spectral transmittance; the attenuating piece is applied to an infrared detector nonlinearity testing system, different first attenuating pieces and second attenuating pieces can be combined to construct an attenuating assembly with a large dynamic range. The testing system using the attenuating piece can realize automatic scanning of incident photon flux density across more than four orders of magnitude, solves the problems of preparation and system integration of a mid-wave large dynamic range attenuating device, and improves the efficiency and reliability of infrared detector response nonlinearity testing.

This invention discloses a vacuum ultraviolet spectrophotometer device. A vacuum ultraviolet monochromatic spectral system disperses the composite light from a vacuum ultraviolet light source to obtain quasi-monochromatic light output. A vacuum ultraviolet collimation system collimates the quasi-monochromatic light, forming a parallel beam. A vacuum ultraviolet chopper system chops and modulates the vacuum ultraviolet signal, dividing the light into a main optical path and an auxiliary optical path. A vacuum switching mechanism switches the positions of multiple vacuum ultraviolet band filter samples under test. Light conversion is achieved through a vacuum light conversion mechanism, and then received by a vacuum detection component for photoelectric conversion. A comprehensive computing system compares and calculates the spectral transmittance value of the tested sample by comparing the main optical path signal and the auxiliary optical path signal. This invention can meet the requirements for vacuum ultraviolet transmittance testing in the 120nm–200nm wavelength range.

The invention discloses a self-cleaning long-wave infrared optical filter and a preparation method thereof. The optical filter comprises an optical filtering structure, a protective layer and a self-cleaning layer. The light filtering structure comprises an infrared transparent substrate and a light filtering layer located on one side of the infrared transparent substrate. The protective layer covers the surface of the side, away from the infrared transparent substrate, of the light filtering layer, covers the partial surface, facing the light filtering layer, of the infrared transparent substrate, and covers the side wall of the light filtering layer. The self-cleaning layer is located on the side, away from the infrared transparent substrate, of the protective layer and comprises at least one or more of a hydrophobic layer, a catalytic decomposition layer and a conductive heating layer. Through the arrangement of the technical characteristics, the anti-pollution capability of the optical filter can be improved, so that the optical filter keeps stable spectrum transmittance under the conditions of long-term operation and complex environment exposure.