32 results about "Photon distribution" patented technology

A method for determining the position of a scintillation event in a radiation particle detector with multiple scintillator element locations which are configured to emit a burst of photons responsive to a radiation particle being absorbed at the scintillator element location and with a plurality of photosensors (5.1, 5.2, 5.3, 5.4) optically coupled to said scintillator element locations, comprising the steps of determining, for each of the photosensors (5.1, 5.2, 5.3, 5.4), a triggering probability indicative of the probability of said photosensor (5.1, 5.2, 5.3, 5.4) measuring a number of photons that exceeds a predetermined triggering threshold; measuring a photon distribution with the photosensors (5.1, 5.2, 5.3, 5.4) indicative of the number of photons incident on the individual photosensors (5.1, 5.2, 5.3, 5.4); calculating, for each of the scintillator element locations, a likelihood that a scintillation event with a predetermined energy value took place in said scintillator element location based on the measured photon distribution and the triggering probability of each of the photosensors (5.1, 5.2, 5.3, 5.4); and identifying the scintillator element location having the maximum likelihood.

A method for determining the position of a scintillation event in a radiation particle detector with multiple scintillator element locations which are configured to emit a burst of photons responsive to a radiation particle being absorbed at the scintillator element location and with a plurality of photosensors (5.1, 5.2, 5.3, 5.4) optically coupled to said scintillator element locations, comprising the steps of determining, for each of the photosensors (5.1, 5.2, 5.3, 5.4), a triggering probability indicative of the probability of said photosensor (5.1, 5.2, 5.3, 5.4) measuring a number of photons that exceeds a predetermined triggering threshold; measuring a photon distribution with the photosensors (5.1, 5.2, 5.3, 5.4) indicative of the number of photons incident on the individual photosensors (5.1, 5.2, 5.3, 5.4); calculating, for each of the scintillator element locations, a likelihood that a scintillation event with a predetermined energy value took place in said scintillator element location based on the measured photon distribution and the triggering probability of each of the photosensors (5.1, 5.2, 5.3, 5.4); and identifying the scintillator element location having the maximum likelihood.

The invention relates to a lighting device (DE) comprising electroluminescent diodes (D1-D4) and a flat light guide (GL) comprising Between the guide part (PG). The input face (FE) supplies photons to the guide part (PG), and the output face (FS) sends the guided photons to the outside. Said electroluminescent diodes (D1-D4) are all arranged opposite respectively to an input zone (ZE1-ZE4) defined in a supply zone (ZA) of said input face (FE), said supply zone being in relation to said Opposite a first output zone (ZS1) of the output face (FS), said input zone being configured for distributing the received photons in a predefined angular sector (SA1-SA4) so ​​that at said output face (FS) A decreasing luminous intensity from said first output zone (ZS1) is induced on a second output zone (ZS2), which is located next to said first output zone (ZS1).

The invention discloses an analysis device for solid-liquid two-phase flow in a magnetic fluid photocatalytic reactor. 2 / PANI / Fe 3 o 4 The water-based magnetic fluid and the alkaline printing and dyeing wastewater to be treated are fully stirred evenly by the turbulent and then input from one end of the reactor; the outer wall of the reactor is equipped with multiple sets of magnetic induction coils, and currents of different intensities are passed through the coils to control the internal flow of the reactor. The strength of the magnetic field; the ultrasonic flowmeter section can obtain the concentration of catalyst particles, and the grating spectrometer section can calculate the number of photon distributions; the photocatalytic degradation reaction effect can be obtained by detecting the pH value of printing and dyeing wastewater; At the same time, the catalytic degradation reaction is completed by solar energy. The structure of the equipment is compact and easy to operate. Through the data comparison of the present invention, solar energy technology can be better used to complete the phase flow analysis and treatment of printing wastewater.

A distributed radar imaging system, comprising: a central station, which modulates n channels of optical carriers of different wavelengths with low-frequency narrow-band chirp electrical signals, and transmits them to a transmitting station and (n-1) receiving stations through optical fibers with different delays respectively, Perform beam combination and parallel deskewing processing on the echo optical signals from the receiving station, and perform analog-to-digital conversion, transmission phase delay compensation, frequency domain segmentation and three-dimensional imaging processing on the combined beam and deskewing signals; The optical radio frequency signal is converted into a high-frequency broadband linear frequency modulation electrical signal for transmission; the receiving station receives the target echo signal, modulates the optical radio frequency signal from the central station, and transmits it back to the central station through optical fiber. The invention also discloses a microwave photon distributed radar imaging method. The invention applies photon frequency doubling, optical fiber radio frequency transmission and photon parallel deskewing processing technology to distributed radar, realizes three-dimensional imaging under the architecture of one transmission and multiple reception, reduces system complexity, and improves system distribution capability and imaging performance.

A novel methodology for characterizing and calibrating an entangled photon distribution system is disclosed. The entangled photon distribution system includes at least a source of entangled photon pairs, two photon detectors which detect photons among two channels and a controller. The methodology includes: for at least two different operational setting levels of the source of entangled photon pairs, measuring count rates for photons detected by the two photon detectors, individually and coincidently; fitting the measured individual and coincidence count rate data for the at least two different operational setting levels with theoretical models of detection probability; and determining operational parameters of the system from the fitting. The determined operational parameters of the system include the rate of generated entangled photon pairs by the source, the rates of Raman-scattered photons generated in the first and second channels, respectively, and the efficiency of the two photon detectors, respectively.

The invention relates to a radiance calculation method with the mixing of a Kd-tree with a Voronoi diagram. The method comprises the steps of (1) constructing a scene topology structure and a Kd-tree hierarchical organization, (2) storing generated a photon map with a polygon face as the unit, (3) carrying out traversal of each polygon of a three-dimensional scene surface, and collecting photos belonging to each polygon and forming a two-dimensional Kd-tree structure, (4) dividing each polygon surface construction Voronoi diagram and calculating the radiation flux density of a Voronoi unit, (5) calculating the intersection point x of a ray emitted from a viewpoint and a scene, (6) according to the polygon face to which the x belongs, collecting near photons by using the two-dimensional Kd-tree structure, (7) finding the precise area covered by the collected photos according to the Voronoi diagram division, and calculating the radiance of the x point. According to the method, the geometric features of local surface photon distribution can be utilized to carry out precise radiance kernel estimation.

The invention belongs to the field of medicine and discloses a gating signal determination method and a gating signal determination device. The method includes: acquiring single photon position information detected in sub-periods of preset duration in a detection period by PET (positron emission tomography) equipment, wherein the single photon position information includes detection crystal identifiers and axial position identifiers; respectively determining single photon distribution information corresponding to each sub-period according to the single photon position information corresponding to each sub-period; determining gating signals according to the single photon distribution information corresponding to each sub-period, and performing PET image reconstruction on the basis of the gating signals. By adoption of the gating signal determination method and the gating signal determination device, diagnosis system cost can be reduced.

The embodiment of the invention provides an imaging method and device, a medium and electronic equipment. The imaging method comprises the steps of acquiring signals and noise of electromagnetic wavespenetrating through a target material in a preset energy interval; constructing a signal-to-noise ratio function of the target material based on the signal and the noise; and maximizing a signal to noise ratio function and determining the weight coefficient of the target material. According to the technical scheme provided by the embodiment of the invention, after energy weighting, the contribution of the low-energy interval to imaging is greater, the signal-to-noise ratio of the image is improved, and the x-ray equivalent attenuation coefficient in the energy region is calculated by utilizing the acquired photon distribution information and the attenuation curve characteristics of photons in different materials, so that the calculation is more accurate.