27 results about "Spectral transmission" patented technology

A glass including silica and titania is disclosed. An average hydroxyl concentration of a plurality segments of the glass is in a range from about 20 ppm to about 450 ppm, an average titania concentration of the plurality of segments is in a range from about 6 wt. % to about 12 wt. %, and each segment of the plurality of segments has a length of about 12.7 mm, a width of about 12.7 mm, and a height of about 7.62 mm. The hydroxyl concentration of each segment is measured using a Fourier transform infrared spectroscopy in transmission, the refractive index is measured using an optical interferometer with a 633 nm operating wavelength and a resolution of 270 microns×270 microns pixel size, and the average titania concentration is determined based upon the measured refractive index.

An apparatus, system, and method for smoothing spectral transmission modulation in an optical fiber includes at least one holder for coupling a portion of the optical fiber, an optical fiber bending member configured to cyclically move a length of the portion from an initial position perpendicular to a longitudinal axis of the portion. The optical fiber bending member is placed adjacent to the at least one holder, and the movement changes a radius of curvature of the portion.

Noise performance of image sensors is improved by use of inter-pixel comparisons, which may number in the hundreds, all contributing information about a given pixel. This permits accurate determination of image chromaticity, even at extremely low signal-to-noise ratios. In other embodiments, filters of non-conventional spectral transmission functions are employed to reduce metamerism, enabling discernment of scene information not visible to the human eye. Still other embodiments involve fabricating a sparse array of transparent pedestals on an image photosensor array. When color resist is thereafter applied, these pedestals cause thickness variations in the resulting resist layer, leading to pixels having different spectral responses despite using the same color resist. Still other embodiments concern image sensor arrangements enabling generation of red, green, blue and NIR output data using only four conventional (red, green, blue, cyan, magenta, yellow) color resists. Many other novel features and arrangements are also detailed.

The invention discloses a dynamic target synchronous tracking and interaction system and method, and relates to the technical field of motion capture, and the system comprises an optical positioning module which is used for switching an optical filter to a narrowband infrared optical filter, marking the narrowband infrared optical filter in a Blob mode, capturing the infrared image data of an actor in real time, and obtaining the information of a marking point; the unmarked visual module is used for switching an optical filter to full-spectrum transmission, marking the optical filter as a video mode, and capturing RGB picture data and space depth information of the actor in real time; the mode switching module is used for switching a Blob mode and a video mode and uniformly using the Blob mode for calibration; and the fusion processing module is used for obtaining the real-time three-dimensional model of the actor, obtaining the dynamic space position of the actor, and carrying out fusion synchronous mapping on the real-time three-dimensional model after weight distribution and the dynamic space position. The method and the device have the effect of improving the accuracy and the anti-interference capability in the motion capture process.

An optical detector unit (10) comprising an optical sensor (16) arranged in a chamber (14) with an aperture (18) in a housing (12), wherein the optical sensor (16) is arranged to detect photons received through the aperture (18), and a diffuser (22) arranged on top of the aperture (18) on the housing (12), should provide improved accuracy and data reliability.According to the invention, this is achieved by the optical sensor (16) comprising an arrangement (36) of sensor pixels (38s) of a first type and pixels (38c) of a second type, wherein the pixels (38s) of the first type each have different spectral transmission properties and each generate a multispectral sensor signal, and the pixels (38c) of the second type have the same transmission properties and each generate a compensation sensor signal, and wherein the compensation sensor signals generated by the pixels (38c) of the second type are provided to generate a compensation parameter for each of the sensor pixels (38s).

In some embodiments, a spectrometer is proposed. According to some embodiments, the spectrometer includes: an optical sensor array including a substrate and a pixel array formed on the substrate; a spectral filter array formed above the pixels of the optical sensor array, the spectral filter array filtering incident light such that each pixel receives light with a spectral transmission profile associated with that pixel; a transparent spacer formed above the spectral filter array; and an opaque mask having an input aperture that allows light to pass through the transparent spacer and reach a portion of the spectral filter array. The spectrometer can be formed from the optical sensor array using photolithography techniques and a combination of bonding of certain layers.

The invention relates to a transparent optical article comprising a thermoplastic substrate, at least one UV absorber, and at least one fluorescing dye at least partially inhibiting transmission of light having a wavelength ranging from 400 to 500 nm, wherein the spectral transmission curve of said transparent optical article has a light cut-off wavelength higher than or equal to 400 nm and an inflection point at a wavelength ranging from 400 to 450 nm, and the slope at said inflection point is higher than or equal to 6% / nm.

The invention provides an optical fiber-free spectrum transmission system, which does not need to use an optical fiber to transmit a signal, can avoid the problem of signal attenuation of the optical fiber in an ultraviolet environment for a long time, and further prolongs the service life of equipment. Comprising a spectrometer main body; the spectral information acquisition module is arranged between the spectrograph main body and a to-be-detected sample and is used for receiving an optical signal generated by plasma sparks on the to-be-detected sample and transmitting the optical signal to the spectrograph main body according to a preset signal transmission path; the spectral information acquisition module comprises at least one group of optical elements with optical coupling focusing, and preset angles are formed between the optical elements and the to-be-detected sample and between the optical elements and the spectrometer main body, so that a signal input path and a signal output path are respectively formed; the signal input path is used for receiving and collecting optical signals generated by plasma sparks on the to-be-detected sample; and the signal output path is used for converging and transmitting the optical signals to the spectrometer main body.

The invention provides a defect detection and repair method for a filling type silicon through hole. The method comprises the following steps: forming the filling type silicon through hole; performing partition scanning on the top surface of the filling type silicon through hole by using a laser confocal system to obtain a three-dimensional surface height distribution diagram of each detection area; emitting terahertz waves upwards from the back surface of the substrate by using a terahertz time-domain spectroscopy system, enabling the terahertz waves to directionally enter a corresponding region at the bottom of the filled through silicon via, and receiving a terahertz reflection signal; based on the three-dimensional surface height distribution diagrams of the detection areas and the corresponding terahertz reflection signals, comprehensively judging whether the detection areas have defects or not and the types of the defects; and if it is judged that the surface cavity defect exists, directional cavity repairing processing is executed. On-line and non-destructive defect detection is realized through a non-destructive detection technology fusing laser confocal scanning microscopy and terahertz time-domain spectrum transmission, and accurate cavity repair is carried out.

The application discloses a dynamic target synchronous tracking and interaction system and method, relates to the technical field of motion capture, and comprises an optical positioning module: used for switching a filter to a narrow-band infrared filter, marking as a Blob mode, capturing infrared picture data of an actor in real time, and obtaining mark point information; a mark-free vision module: used for switching the filter to full-spectrum transmission, marking as a video mode, capturing RGB picture data and spatial depth information of the actor in real time; a mode switching module: used for switching the Blob mode and the video mode, and calibrating by uniformly using the Blob mode; a fusion processing module: used for obtaining a real-time three-dimensional model of the actor, obtaining a dynamic spatial position of the actor, and performing fusion synchronous mapping on the real-time three-dimensional model and the dynamic spatial position after weight distribution. The application has the effect of improving the accuracy and anti-interference capability in the motion capture process.

The application provides a wide-spectrum high-transmittance low-reflectance glass surface modification process and application thereof, relates to the technical field of optical materials and glass surface treatment, and comprises the following steps: providing a glass substrate for wide-spectrum transmission application, and performing surface pretreatment on the glass substrate. The wide-spectrum high-transmittance low-reflectance glass surface modification process and application thereof are characterized in that: the surface of the glass substrate is pretreated, the glass substrate is immersed in a surface modification liquid containing silicon oxide particles and aluminum oxide particles, and a surface modification layer is formed on the surface of the glass substrate after immersion, pulling and drying, so that the optical performance of the glass surface is improved; the obtained glass has high transmittance and low reflectance in a wide-spectrum range of 380nm-1400nm, and can meet the application requirements of wide-spectrum transmission devices such as display cover plates, optical windows, sensor protection sheets, imaging module light transmission components and photoelectric detection components.

A glass including silica and titania is disclosed. An average hydroxyl concentration of a plurality segments of the glass is in a range from about 20 ppm to about 450 ppm, an average titania concentration of the plurality of segments is in a range from about 6 wt. % to about 12 wt. %, and each segment of the plurality of segments has a length of about 12.7 mm, a width of about 12.7 mm, and a height of about 7.62 mm. The hydroxyl concentration of each segment is measured using a Fourier transform infrared spectroscopy in transmission, the refractive index is measured using an optical interferometer with a 633 nm operating wavelength and a resolution of 270 microns×270 microns pixel size, and the average titania concentration is determined based upon the measured refractive index.

There is provided a method for measuring the spectral transmission response of a DUT using a multi-wavelength Optical Time Domain Reflectometer (OTDR) which allows performing OTDR measurements across a spectral range of interest. The OTDR targets a single reflective OTDR event along the OTDR trace, e.g., a mirror, a non-angled polished (UPC) connector or any other reflective surface located at the remote end of the DUT, which reflectance peak in combination with a reference measurement allows to perform single-end measurements of the transmission response. The process is repeated at various wavelengths to obtain a spectral transmission response of the DUT.

The invention relates to a filter (10) for modifying human color vision, having a spectral transmission function in the visible range, wherein the average transmission in a wavelength range of at least 20 nm width below 530 nm is at least twice the average transmission in a second wavelength range between 530 and 580 nm, and the average transmission in a wavelength range of at least 20 nm width above 580 nm is at least twice the average transmission in the second wavelength range. The invention comprises a dyed carrier lens (12) and an interference filter (14) arranged thereon, the transmission function of the dyed carrier lens (12) and the transmission function of the filter (10) having the following relationship in the second wavelength range: T sd (λ) < 1 - V(λ) · (1 - T(λ)) · n, wherein T(λ): is the transmission function of the filter (10), T sd (λ): is the transmission function of the dyed carrier lens (12), V(λ): is the sensitivity function of the human eye normalized to 1, n ≥ 0.3. The invention also relates to a method for designing such a filter (10).

The application discloses a hyperspectral scanning imaging system and method based on a double adjustable filter structure, and the system further comprises a scanning mechanism for driving at least two of the first adjustable filter structure, the second adjustable filter structure and the target to perform relative scanning movement. The center transmission wavelength of the two adjustable filter structures continuously or discretely changes along the spatial position, and the spectral bandwidth and the free spectral range thereof satisfy a specific matching relationship. The total spectral transmission function of the system is equal to the product of the transmission functions of the two adjustable filter structures, so that the simultaneous acquisition of high spectral resolution and wide non-aliasing working spectral range is realized. The application overcomes the technical contradiction that the traditional single-stage filter structure is difficult to simultaneously consider high spectral resolution and wide spectral range, and has wide application value in the fields of spectral detection, machine vision and remote sensing.

This application provides a training method, phase compensation method, and electronic device for a time-series prediction model of turbulence in space optical communication. The method includes: acquiring distorted spot intensity data from multiple frames of historical moments collected by the receiver in a space optical communication system, and constructing a historical spot intensity sequence based on a preset sliding window; performing multiple rounds of self-supervised learning steps on a spatiotemporal prediction network, including: inputting the historical spot intensity sequence into a 3D convolutional neural network in the spatiotemporal prediction network to generate a predicted phase screen for the target prediction moment; converting it into predicted spot intensity using an angular spectral transmission model, and acquiring the actual detected spot intensity at the target prediction moment; constructing a loss function and calculating the target loss value to update the parameters of the spatiotemporal prediction network; if the model converges, outputting the spatiotemporal prediction network as a time-series prediction model for turbulence in space optical communication. This application can solve the problems of significant lack of temporal dimension information and response lag in existing technologies.

The invention discloses a method and a system for generating an astronomical spectrum calibration light source. According to the invention, double optical frequency combs with similar repetition frequencies are adopted, most output light of one optical frequency comb passes through an FP cavity to obtain pulses with high repetition frequencies, the pulses and most output light of the other optical frequency comb are collinearly interfered and incident to a balanced photoelectric detector, and data are collected and subjected to Fourier transform to be used as a signal spectrum; a small part of output light of the two optical frequency combs is subjected to beam combination and interference, is received by a photoelectric detector, is subjected to data acquisition, is subjected to Fourier transform and then serves as a reference spectrum, a spectrum transmission function of the FP cavity is obtained, a calibration light source filtered by the FP cavity is corrected, and a calibration light source of the astronomical spectrometer is obtained; the method has the advantages of wide spectrum coverage, ultrahigh precision and long-term stability; the FP cavity does not need to be absolutely locked, and only the frequency change trend needs to be measured; high-stability output is obtained through a low-cost and low-stability device, and the actual spectral response of the FP cavity is accurately solved.

The invention relates to the technical field of optical sensing fiber-optic gyroscopes, in particular to a fiber-optic gyroscope optical path spectral error analysis method based on OSA and OCDP fusion, which comprises the following steps: measuring a power spectral density function of a fiber-optic gyroscope light source and spectral transmission functions of a coupler and a Y waveguide; acquiring a polarization coupling intensity distribution curve; obtaining the optical path difference and the amplitude intensity ratio of a plurality of characteristic coupling points of the polarization coupling intensity distribution curve; sequentially multiplying the power spectral density function of the optical fiber gyroscope light source and the spectral transmission functions of the coupler and the Y waveguide to obtain an ideal normalized main spectrum; obtaining a full-optical-path spectrum of the fiber-optic gyroscope based on the ideal normalized main spectrum and the optical path difference and the amplitude-intensity ratio of the plurality of feature coupling points; analyzing based on the full-optical-path spectrum to obtain a physical defect position and error intensity; the error analysis accuracy of the fiber-optic gyroscope can be improved.

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.

Provided is a high-speed and high-accuracy tablet spectroscopic measurement technology that enables total inspection. A pulsed light irradiation system irradiates a tablet being linearly moved by a movement mechanism with pulsed light in which an elapsed time in each pulse and a wavelength correspond to each other on a one-to-one basis, the output from a light receiver that has received transmission light from the tablet is input to a calculation means via an AD converter and an FPGA as an integration means, and a spectral transmission spectrum is calculated. In a case where the variation in spectral characteristic is measured, grouping is performed for multiple times of pulsed light irradiation performed on different locations, integration is separately performed, spectral transmission spectra are calculated and then compared.

The application discloses a visible light communication transmission method of mixed VOOK and restructured hierarchical OFDM, which comprises the following steps: generating a time domain signal of VOOK according to a code word of VOOK; generating a time domain signal of hierarchical OFDM by layering subcarrier numbers; generating a reconstruction signal according to the time domain signal of VOOK; superimposing the time domain signal of VOOK, a frequency domain signal of hierarchical OFDM and the reconstruction signal to generate a VLC transmission signal; inputting the VLC transmission signal into an LED after digital-to-analog conversion for illumination and communication transmission; converting the received communication transmission signal into an electrical signal through a photoelectric detection device at a receiving end; and performing signal detection of VOOK and hierarchical OFDM in parallel after IFFT operation and frequency domain equalization. The application effectively improves the spectral efficiency of transmission, realizes the dual functions of efficient spectral transmission and dimming control, avoids the dependence of signal detection of hierarchical OFDM on the dimming level of VOOK, has higher spectral efficiency, and effectively reduces the receiving complexity and processing time delay.

The invention discloses a mid-infrared spectrum chip based on an on-chip integrated optical filter and a spectrum reconstruction method, and mainly aims to solve the problems that an existing mid-infrared spectrum chip based on the on-chip integrated optical filter cannot meet the three requirements of room temperature, high resolution and miniaturization at the same time and is difficult to adapt to in-situ scenes such as biomedicine and environmental monitoring. Comprising filtering channels with different spectrum transmission characteristics and is used for configuring spectrum weighting for incident light passing through the different filtering channels to obtain spectrum coding signals, and one filtering channel and one array unit of a detector array form a pixel unit; the detector array is used for converting the spectrum coding signals of all the array units into an electric signal sequence; the reading circuit is used for performing digital conversion on the electric signal sequence to obtain a spectral vector; and the reconstruction processing unit is used for carrying out inversion on the spectrum vector to obtain reconstructed spectrum distribution.

The application discloses a kind of automobile glass screen quality evaluation method and system combined with multispectral imaging, the method comprises the following steps: collecting glass screen image of different wave band and carrying out spectral response calibration, obtain calibrated multispectral data cube;Based on the calibrated multispectral data cube, the spectral transmittance distribution characteristics of each wave band in the region divided on glass screen are calculated, and spectral transmission characteristic curve is constructed;Based on the spatial frequency distribution of spectral transmittance, the optical uniformity evaluation characteristics of each wave band on the surface of glass screen are calculated, and optical uniformity evaluation index is constructed;By calculating the spectral reflectance distribution of each wave band, the spectral characteristic value of the region divided on glass screen is obtained and material characteristic fingerprint matrix is constructed, the similarity of to-be-measured product and standard sample on material characteristic fingerprint is calculated;Based on the similarity of spectral transmission characteristic curve, optical uniformity evaluation index and material characteristic fingerprint, the quality grade of glass screen is multidimensional comprehensive score.

An integrated semiconductor optoelectronic component for sensing ambient light levels includes a silicon photomultiplier configured to deliver an output signal indicative of the intensity of the light that irradiates the component. The silicon photomultiplier has an active surface area for light detection. The component also includes an optical filter covering the active surface area of the silicon photomultiplier. The optical filter is adapted to selectively transmit light onto the active surface area as a function of wavelength. The optical filter is a scotopic filter and has a spectral transmission curve that mimics the spectral response of the human eye under low-light conditions. The component further includes readout electronics for processing the output signal of the silicon photomultiplier.

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 discloses a kind of based on target spectrum distribution's multi-channel backlight and liquid crystal subpixel collaborative drive calculation method, it is applied to multi-channel spectrum controllable liquid crystal display system.The method includes: obtaining display target containing target display spectrum distribution constraint;Based on the spectral characteristics of multi-channel backlight and the spectral transmission characteristics of liquid crystal display panel, display output spectrum model is constructed;With display output spectrum approximation target spectrum distribution as optimization target, under the condition of meeting display brightness constraint, power consumption constraint, hardware capability constraint and chromaticity consistency constraint, the output intensity of each spectral subchannel backlight and the driving modulation coefficient of red, green and blue subpixels are determined by optimization calculation;Multi-channel backlight module and liquid crystal display panel are controlled to carry out collaborative modulation, so that display output spectrum approximates the target display spectrum distribution in predetermined spectral range.The application can realize the fine regulation and control of display output spectrum without changing the structure of liquid crystal display panel, and provides a kind of calculation method for realizing the display effect close to natural spectrum distribution.

The invention provides a multichannel interference multiplexing type external cavity laser chip, and relates to the technical field of external cavity lasers, and the multichannel interference multiplexing type external cavity laser chip comprises an external cavity, a first reflection type semiconductor optical amplifier array and a second reflection type semiconductor optical amplifier array. The outer cavity comprises a first light reflector, a light switch, a free spectrum transmission area, a phase shifter array, a light delay line array and a second light reflector. According to the invention, wavelength multiplexing and tuning are realized by using a single external cavity, so that the integration level of the external cavity laser is improved; through different central gain wavelengths of the first reflection type semiconductor optical amplifier array and the second reflection type semiconductor optical amplifier array, multi-wavelength optical signal output is ensured to be formed under two wave bands by utilizing the difference of the gain wavelengths, so that the wavelength coverage range and the application scene of the laser are expanded, and the optical signal output efficiency is improved. And ultra-large bandwidth wavelength tuning of the external cavity laser is realized.