40 results about "Spectral transmission" patented technology

The invention provides a spectrograph based on a fast adjustable filter, the spectrograph comprises the fast adjustable filter, a photoelectric detector, a data acquisition card and a spectrum reconstruction module which are connected in sequence, the fast adjustable filter successively filters spectral components of different wavelengths in the working bandwidth of the spectrograph in sequence, and after each filtering, the spectral components of different wavelengths in the working bandwidth of the spectrograph are obtained. The photoelectric detector detects an optical signal with corresponding light intensity and converts the optical signal into an electric signal, and when the wavelength of the filtered spectral component is within the wavelength range of the to-be-detected light, the light intensity of the optical signal and the current of the electric signal are reduced; the data acquisition card performs current acquisition on each electric signal in sequence to obtain a to-be-measured current vector; the spectrum reconstruction module reconstructs the light spectrum to be measured according to the collected current vector to be measured and a pre-stored spectrum transmission matrix. The spectrograph is high in detection speed, small in size and simple in detection method.

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.

The invention relates to a design and preparation method of selective spectral transmission agricultural photovoltaic glass, and belongs to the field of photovoltaic agricultural cross technologies. The agricultural photovoltaic glass is synergistically designed through multiple layers of functional structures and comprises a selective spectrum transmission layer, a bottom diffuse scattering layer and an edge photovoltaic unit. The selective spectrum transmission layer is formed by compositing a photoluminescence substance layer and a glass layer, incident ultraviolet light (300-400 nm) can be converted into red light (620-680 nm), the number of parts beneficial to crop growth in transmission light is increased, selective transmission of incident solar spectrums is achieved, and full transmission of visible light (400-700 nm) and infrared light (700-1000 nm) is guaranteed while ultraviolet light is isolated. The photovoltaic unit is arranged along the edge of the glass, and utilizes the optical waveguide total reflection principle to efficiently collect ultraviolet converted light for power generation. The problems that traditional photovoltaic glass is low in light transmittance and spectral absorption conflicts with plant requirements are solved, and synergistic interaction of greenhouse light transmittance, crop growth and clean power generation is achieved.

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.

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 invention relates to the technical field of safety detection, in particular to a hydrogen-doped natural gas safety detection method and system based on data analysis, and the method comprises the following steps: analyzing the light intensity change trend of a measurement channel based on the spectral transmittance data in a hydrogen-doped natural gas transmission and distribution pipeline, calculating the spectral transmission variable quantity corresponding to an optical path, and calculating the spectral transmission variable quantity; and screening light energy attenuation characteristics corresponding to the optical path to obtain spectral attenuation characteristic data. According to the invention, the spectral transmittance data is deeply analyzed, the measurement precision of light intensity change and light energy attenuation is improved, the accuracy of spectral attenuation characteristic data is enhanced, and the spectral attenuation curve is optimized and the measurement stability is improved by combining short and long optical path transmission information and identification of differential hydrogen mixing proportions; spectrum data are dynamically corrected by using an offset model, the kinetic energy and the flowing direction of leaked gas are accurately analyzed, the diffusion path of a leakage point is extracted, the safety assessment process is optimized, and the timeliness and the effectiveness of risk early warning are improved.

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.

An optical detector unit (10) comprising an optical sensor (16) arranged in a chamber (14) having an aperture (18) within a housing (12), the optical sensor (16) being 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 enhanced accuracy and data reliability. According to the invention, this is achieved in that the optical sensor (16) comprises an array (36) of sensor pixels (38s) of a first type and pixels (38c) of a second type, the pixels (38s) of the first type each having a different spectral transmission characteristic, each generating a multispectral sensor signal, and the pixels (38c) of the second type having the same transmission characteristic, each generating a multispectral sensor signal. Compensation sensor signals are each generated, and wherein the compensation sensor signals generated by the pixels (38c) of the second type are provided for generating compensation parameters for each sensor pixel (38s).

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 an intermediate infrared band-stop optical filter based on a metal metasurface array structure, and belongs to the technical field of optical filtering. Comprising a substrate and a metasurface structure. The substrate is made of a mid-infrared high-transmittance substrate material, and the metasurface structure of each array unit is a metal cross structure. Plane wave incident light vertically enters the optical filter from top to bottom; from the perspective of the whole wave band, a spectral transmission curve has an obvious light blocking effect near a target center wavelength, compared with the intrinsic transmittance of a substrate material, the intrinsic transmittance has obvious transmission attenuation, the average bandwidth is small, the average spectral resolution is small, and the average spectral energy utilization rate is larger than 85%. The mid-infrared band-stop optical filter provided by the invention has good band-stop effect, spectral resolution and high spectral energy utilization rate in a working wave band.

The present invention discloses an optical filtering device, a computational spectrometer, and a spectrum reconstruction method. The optical filtering device comprises a multi-microring resonator parallel structure formed by cascading a plurality of uplink and downlink microring resonators, each of which is provided with an adjustable phase shifter. The input port separates TE light and TM light via a polarization beam splitter and is respectively connected to one end of an upper waveguide and a lower waveguide of the multi-microring resonator parallel structure. The other ends of the upper and lower waveguides each output TE light and TM light independently via the polarization beam splitter. The scheme uses an inverse design algorithm to adjust the structural parameters of the optical filtering device so that its spectral transmission line has greater randomness, thereby achieving an ideal autocorrelation width. The adjustable phase shifter realizes variable filtering behavior, and the spectra of TE light and TM light can be reconstructed separately.

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 present invention relates to the technical field of liquid crystal electronic devices, and in particular to a method for calculating the effective tuning spectrum range of a dual-wavelength LCTF, which comprises the following steps: determining initial structural parameters; limiting the tuning spectrum range of a gain wavelength to a free spectrum range; limiting the condition that only one gain wavelength is transmitted within the free spectrum range, and calculating the tuning spectrum range of a center wavelength; limiting the tuning spectrum range of the center wavelength to be contained within the free spectrum range, and obtaining the effective tuning spectrum range of the final center wavelength; accurately calculating the effective tuning spectrum range of the gain wavelength; and determining a transmission factor Q that satisfies the conditions based on theoretical design results. p , calculate the delay amount of each cascade liquid crystal; simulate the spectral transmission of the dual-wavelength LCTF system in the free spectrum range; the present invention solves the problem of the complicated design process of the transmission factor of the dual-wavelength LCTF system and simplifies the selection process of the transmission factor of the multiple tuning center wavelength.

The invention belongs to the technical field of photoelectric detection and sensing and infrared imaging, and relates to a high-hardness antireflection film window processing method applied to an atmospheric infrared window wave band. Comprising the following steps: selecting a zinc selenide infrared crystal as a window material, selecting zinc selenide, ytterbium fluoride, zirconium oxide and diamond-like carbon as optical thin film materials, designing a film system structure, and respectively completing plating of a first surface film system structure and a second surface film system structure and finished product detection by adopting a vacuum coating mode. Compared with the prior art, the surface hardness, corrosion resistance, adhesion resistance and infrared band transmittance of the infrared crystal window are improved, the infrared crystal window has excellent infrared spectrum transmission performance and environmental adaptability, the service life of the infrared crystal window is prolonged, long-term stable operation of an infrared detection system is guaranteed, and the service life of the infrared detection system is prolonged. And a solid foundation is provided for iteration upgrading of infrared detection and infrared imaging equipment.

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.