13 results about "Photon flux" patented technology

The application discloses a method for non-contact testing of quantum efficiency (EQE) and short-circuit current (ISC) of a solar cell, relates to the technical field of photovoltaic device testing, and aims to solve the problems that the existing quantum efficiency and short-circuit current measurement must contact electrodes, is slow and cannot cover new gateless or process pieces; a non-contact testing method of "multi-wavelength LED excitation + local shielding + carrier lateral diffusion" is provided; the method blocks the excitation light by using a shielding filter, and only transmits the electroluminescence signal of the shielding area; the EL power of each wavelength is extracted through phase-locked amplification and deep learning denoising, the continuous EQE curve is calculated by using the calibrated incident photon flux ratio, and the ISC is obtained by convolution of the AM1.5 spectrum.

This application relates to the field of microscopic imaging radiation calibration technology, providing a photon flux standard source and a method for measuring photon flux responsivity. The photon flux standard source includes an integrating sphere light source and an aperture; the outer side of the integrating sphere light source outlet includes a first flat surface with a first area, and the side of the aperture near the integrating sphere light source has a second flat surface with a second area. The first flat surface and the second flat surface are parallel and have a planar gap. The integrating sphere light source outlet has an average brightness within a solid angle defined by the aperture; wherein the planar gap, the average brightness, the first area, and the second area are used to calculate the photon flux to determine the photon flux responsivity of the detector under test. This application can accurately determine the photon flux entering the microscopic imaging system, thus improving the accuracy of the photon flux responsivity of the microscopic imaging system calibrated based on the photon flux.

The present disclosure provides methods that enable sequence-specific nucleic acid amplification in-situ using photo-switchable molecular constructs. The sample comprising target nucleic acids is exposed to pulsed photon fluxes with different wavelengths to actuate the photo-switchable molecular constructs that trigger and / or halt specific biochemical reactions resulting in amplifying the specific nucleic acid sequences in a linear or exponential fashion.

The present disclosure provides a kind of optical quantum flux sensor, comprising: photoelectric conversion unit, for collecting the pulse light signal of to-be-measured light source and converting it into pulse electric signal;Signal amplification unit, for amplifying the pulse electric signal from photoelectric conversion unit into direct current voltage signal;Analog-digital conversion unit, for analog-digital conversion to direct current voltage signal to produce digital quantity signal;Control unit, for sampling, filtering and table lookup to digital quantity signal from analog-digital converter to determine the calibration data corresponding to the digital quantity signal and provide calibration data to digital-analog conversion unit;Digital-analog conversion unit, for digital-analog conversion to calibration data from control unit to produce analog signal for indicating the current optical quantum flux density of to-be-measured light source;Power supply unit, for connecting external power supply to power signal amplification unit, analog-digital conversion unit, control unit, digital-analog conversion unit.The present disclosure also provides a kind of optical quantum flux measurement method.The present disclosure embodiment can realize the optical quantum flux detection of pulse light signal.

The application provides a simulation prediction method and system for slow positron source intensity in a research reactor, comprising the following steps: S1, reading arrangement information of components in a reactor core of the research reactor; S2, constructing a Monte Carlo model of the reactor core containing a slow positron source device, and obtaining neutron multi-group angular flux and photon multi-group angular flux information near the slow positron source generating device; S3, constructing a slow positron Monte Carlo model; S4, performing energy-angle double sampling to obtain an incident neutron energy probability density distribution function f n,ig,ia , an angle probability density distribution function f n,ia , an incident photon flux energy probability density distribution function f g,ig,ia , an angle probability density distribution function f g,ia , and a neutron-photon weight factor; S5, performing function sampling of particle types, energy and angle; and S6, obtaining slow positron distribution information generated in the slow positron generating device. The application accurately considers the whole life cycle of slow positron generation and transportation through multi-stage coupling, and realizes accurate prediction of slow positron source intensity.

Disclosed in the present application is a training method for a self-supervised microscopic image processing neural network. The method comprises: using an optical microscopic imaging system, which has a time-correlated single photon counting function, to acquire a fluorescence microscopic image data set, wherein the fluorescence microscopic image data set comprises a photon counting distribution set {Gmn(t)}MN for M×N pixels, M and N both being integers greater than 1, m ranging from 1 to M, n ranging from 1 to N, and t representing time; and by means of photon flux redistribution, constructing, from the photon counting distribution set for the M×N pixels, a training data set for a neural network comprising a fluorescence lifetime prediction convolution module and / or a denoising convolution module.

The application relates to a short-circuit current calculation method, a test system and a computer program product of a solar cell. A reflectivity signal corresponding to a to-be-tested solar cell is acquired; relative photoelectric response information of the to-be-tested solar cell under different wavelengths is acquired; the relative photoelectric response information is obtained by applying direct current bias light to the to-be-tested solar cell to make the to-be-tested solar cell work at a preset working point, applying alternating current modulation light of multiple wavelengths to the to-be-tested solar cell, and measuring at a modulation frequency corresponding to each alternating current modulation light; relative external quantum efficiency is calculated based on the relative photoelectric response information; absolute external quantum efficiency is calculated according to the reflectivity signal and the relative external quantum efficiency; and short-circuit current of the to-be-tested solar cell is calculated according to the absolute external quantum efficiency and a standard solar light photon flux spectrum. The method effectively improves the accuracy of the short-circuit current calculation result.

The application relates to a detection method and device based on quantum period matching and a detection equipment. The method comprises the following steps: obtaining a quantum characteristic period of a target object; the quantum characteristic period is determined according to an energy level difference of the target object and a Planck constant; generating detection radiation according to the quantum characteristic period of the target object and a preset first period matching relationship; the quantum characteristic period of the detection radiation satisfies the first period matching relationship with the quantum characteristic period of the target object; obtaining a period offset, a period broadening coefficient and a photon flux of the detection radiation after the detection radiation interacts with the target object; and obtaining multi-dimensional physical information of the target object according to the period offset, the period broadening coefficient and the photon flux, so as to realize accurate perception of the speed, vibration frequency, reflectivity and transmissivity of the target object.

The application belongs to the technical field of laser, and discloses a steady-state simulation method, equipment and storage medium of a solid laser. A pump source model is constructed to calculate pump light intensity and photon flux; a crystal heat source distribution is solved based on the pump light intensity, a three-dimensional temperature field and a thermal lens focal length are obtained by using a step-by-step Fourier solving method; the stability is analyzed by dynamically updating the equivalent g parameter and the curvature radius of the resonant cavity by using the thermal lens focal length; the pump absorption and gain distribution are calculated in combination with the pump light intensity, the photon flux and the crystal boundary reflection characteristics; the pump-laser mode overlap factor is calculated based on the beam parameter calculated according to the equivalent g parameter, the pump light intensity and the laser light intensity; the laser threshold power is calculated, and the output power is calculated in combination with the threshold power and the input pump power; the steady-state laser field is iteratively solved based on the equivalent g parameter, the thermal lens focal length and the gain distribution, and finally the simulation result is output, the dynamic coupling feedback of the thermal lens focal length and the resonant cavity parameter is realized, and the simulation precision is significantly improved.

The application discloses a kind of simulation prediction methods of indoor radioactivity distribution, comprising: constructing indoor building model, the radioactivity absorption simulation of different radionuclide sources is carried out, and the photon flux of corresponding position in the room of indoor building model is obtained;Calculate the ideal absorption dose rate of room irradiation under the specific activity condition of different radionuclide sources;Photon flux is used as input data, and target absorption dose rate is used as output data;Training data set is constructed, random forest regression model is trained, and trained random forest regression model is output;The photon flux of radionuclide in different positions in the room collected by photon detector is input into trained random forest regression model, and the distribution of indoor room irradiation absorption dose rate is obtained.The application can be used for radioactivity level analysis in multi-target scene, and solve the problem that previous building material radioactivity level analysis can only be calculated by empirical formula, so that it is not accurate enough.

The present application relates to the technical field of medical digital imaging, and discloses a CT scanning parameter self-adaptive control and adjustment system based on texture decomposition reconstruction, which comprises a sliding window data acquisition module, a fast texture state sensing module, a dual variable saturation analysis module and a dual-channel dynamic impedance matching control module. The system uses a sliding window to real-time intercept local projection data, extracts a second dual variable representing texture gradient through an original-dual iterative algorithm, and calculates the saturation of the second dual variable within a constraint boundary to generate a feedback error. The control module responds to the error to perform dual-channel synchronous adjustment: the first channel adjusts the tube current of an X-ray generating device, and the second channel dynamically adjusts the regularization parameter of a reconstruction model according to the tube current value. The present application realizes dynamic impedance matching of physical photon flux and algorithm regularization intensity, ensures the balance of image texture and noise under different attenuation regions, and reduces the radiation dose while ensuring the diagnostic image quality.

The application relates to the technical field of X-ray sources, and discloses an X-ray source based on gas plasma discharge, which comprises a vacuum containing cavity formed in a gas containing structure; a discharge cathode structure comprises a cathode target, the cathode target is used for discharging to a working gas in the vacuum containing cavity, so that cations formed by the working gas bombard the cathode target to generate an electron beam; a driving structure is connected with the vacuum containing cavity and an anode target structure, the anode target structure comprises an anode target, the driving structure is used for driving the electron beam to flow into the anode target structure through the driving structure and bombard the anode target, so that the anode target structure emits X-rays. By arranging the cathode target, the problem of filament overheating and ablation can be avoided, the service life of the X-ray source is prolonged, the stable output of the electron beam is realized, the photon flux of the X-rays is improved, and the X-ray source can meet the use requirements of high-precision detection and analysis instruments.