10 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.

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 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.

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 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 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.