18 results about "Photon distribution" patented technology

The invention provides an energy light index fluctuation ultra-low contrast target detection method and device, which can be applied to the technical fields of computational optical imaging, infrared detection and target identification and tracking. The method comprises the following steps: constructing an energy light index, wherein the energy light index is used for quantifying the energy-photon distribution difference of a medium-wave infrared band and a long-wave infrared band; based on the energy light index, performing spatial domain screening on the dual-band infrared image to generate a candidate target area; second-order photon coherence fluctuation of the candidate target area is calculated based on the energy light index time sequence data of the candidate target area, and the second-order photon coherence fluctuation represents time fluctuation associated with the photon number; calculating a fluctuation enhancement factor based on the second-order photon coherent fluctuation; and performing quantum statistical recognition based on the fluctuation enhancement factor, and outputting a target detection result. According to the method, target detection can still be accurately carried out under the conditions that the temperature difference between the target and the background is extremely small, the emissivity difference is fine and the frequency spectrum is disguised.

An Entangled photons distribution and measurement system includes a photon source including two outputs, able to generate a pair of entangled photons, the first photon being emitted on the first output and the second photon on the second output, a first optical link connected to the first output of the photons source, to deliver the entangled photons to a first device, an optical switch to route photons from the second output of the photons source to the first or second output of the optical switch, a second optical link connected to the first output of the optical switch, to deliver the entangled photons to a second device, and a measurement device connected to the second output of the optical switch, wherein the optical switch is configured to switch between its first and second output to switch between two operating modes.

The application relates to a single-photon denoising method based on alternating horizontal and vertical division, and relates to the technical field of photon data processing. The original photon data is uniformly pretreated, the influence of uneven photon distribution is eliminated by dynamically adjusting the along-track coordinate, an alternating horizontal and vertical division strategy is adopted, vertical division and horizontal division are recursively executed, the distance between the photons on both sides of the division line and the division line is ensured to be equal, until the termination condition is met, the number of times of photon division is counted, and the optimal threshold is adaptively selected by combining the maximum between-class variance method to filter out noise photons. Through dynamic selection of the division line for alternating horizontal and vertical division, the statistical characteristics of the number of times of photon division are combined, and the maximum between-class variance method is used to adaptively determine the threshold of the best division, so that efficient separation of signal photons and noise photons can be realized.

A kind of miniature neutron detector conical surface light-concentrating heat-resistant probe, its characteristics include luminous body, light-concentrating cylinder, light-concentrating lens, armored shell, fixing sleeve, compression spring, set screw and optical fiber;Flasher material is made into cylindrical luminous body by using capillary glass tube, the volume of flasher material increases, the neutron activation reaction of flasher material is more sensitive, the light-emitting surface area increases, effectively improve the number of photons generated by flasher material, then light emitted by luminous body is collected, refracted and converged by light-concentrating cylinder and light-concentrating lens, compared with traditional detector probe, effectively reduce the light attenuation of light signal in the process of optical fiber transmission due to random angle incidence, different energy level photon distribution is more uniform and concentrated, the signal strength after conversion is strong, signal pulse accumulation is less, it is easier to be read, greatly improve the detection efficiency of detector, have good enlightenment effect on the technical problems faced by the field, have good popularization and application value.

The application discloses a kind of ultra-high space-time resolution detection imaging method and system, it is related to optical technology field, including the following steps: to multi-wavelength short pulse laser photon space-time dynamic modulation, make single pulse local irradiation field photon number in single photon / few photon state;The patterned photon distribution microshrink after photon space-time dynamic modulation is carried out on the sample containing fluorescent molecule under few photon irradiation two / multi-photon excitation, collects two / multi-photon fluorescence;Through high space-time resolution detection means, obtain the spectral information, life information and spatial position information of two / multi-photon fluorescence, reconstruct the fluorescence information in field of view, complete the entire field of view ultra-resolution imaging and positioning.The application can realize large field of view, high frame frequency, ultra-resolution fluorescence detection imaging, for solving the major scientific problem of "optical diffraction limit", realize ultra-resolution fluorescence microscopy technology innovation provides opportunity.

The invention provides a distributed feedback laser and a performance verification method thereof, and a grating structure, the grating structure of the distributed feedback laser comprises a first grating section and a second grating section, a phase shift grating is arranged between the first grating section and the second grating section, and the grating transverse width of the first grating section is smaller than the grating transverse width of the second grating section. The coupling coefficient of the first grating section is smaller than that of the second grating section. The distributed feedback laser comprises a high-reflection film coating end and an anti-reflection film coating end, the first grating section is close to the high-reflection film coating end, and the second grating section is close to the anti-reflection film coating end. The grating sections with different coupling coefficients are designed in a segmented manner, and the phase shift grating is introduced between the grating sections, so that the photon distribution can be homogenized, the longitudinal space hole burning effect is effectively inhibited, the line width is narrowed, and the single longitudinal mode stability is enhanced.

Provided is a microwave photonic distributed radar device, comprising: an optical carrier signal generation module for generating an optical carrier signal; the optical frequency domain reflectometer module is used for dividing the optical carrier signal into a reference optical signal and a detection optical signal, and is used for transmitting the detection optical signal through an optical fiber to be detected; the photoelectric conversion module is used for dividing the detection optical signal into an emission optical signal and a to-be-mixed optical signal, and is used for converting the emission optical signal into an emission electric signal; the transmitting antenna is used for transmitting the transmitting electric signal; the optical frequency mixing module is used for performing frequency mixing on the to-be-mixed optical signal and the radar echo signal to form a frequency mixing optical signal; and the signal processing unit is used for processing the reference optical signal and the reflected optical signal to obtain information of the optical fiber to be detected, and is used for processing the frequency mixing optical signal to obtain radar detection target information. According to the invention, parallel processing of radar multi-node detection and distributed state monitoring of the optical fiber link can be realized, and the utilization efficiency of data resources is remarkably improved.

The application provides a method and device for detecting an ultra-low contrast target with exponential fluctuation of light, which can be applied to the fields of computational optical imaging, infrared detection, target identification and tracking. The method comprises the following steps: constructing an energy-light index, which is used to quantify the energy-photon distribution difference in the mid-wave infrared and long-wave infrared bands; based on the energy-light index, performing spatial domain screening on a dual-band infrared image to generate a candidate target region; based on the time sequence data of the energy-light index of the candidate target region, calculating the second-order photon coherent fluctuation of the candidate target region, which represents the time fluctuation of the photon number correlation; based on the second-order photon coherent fluctuation, calculating a fluctuation enhancement factor; and based on the fluctuation enhancement factor, performing quantum statistical identification to output a target detection result. This method can accurately detect targets in the case of extremely small temperature difference between the target and the background, subtle emissivity difference and spectral camouflage.

The invention relates to a power transmission line detection imaging method and system, and the method comprises the steps: shooting a power transmission line through a single-photon laser radar in a non-interference environment, and obtaining a first photon distribution histogram; calculating peak time of each pixel point in the first photon distribution histogram; shooting the power transmission line through the single-photon laser radar in an interference environment to obtain a second photon distribution histogram; according to the peak time of each pixel point in the first photon distribution histogram, calibrating the expected time position of a target reflection peak in the second photon distribution histogram; calculating the depth distance of each pixel point in the calibrated second photon distribution histogram; and synthesizing the depth distances of the second photon distribution histograms of all the pixels in the interference state to obtain a depth distance map of the power transmission line. According to the invention, high-precision transmission line imaging can be synthesized.

The invention relates to the technical field of photon sounding, and discloses a point cloud denoising clustering method and device based on an intensity aggregation profile, and the method comprises the steps: constructing a noise region photon distribution model and a signal interface photon distribution model; defining uniform intensity, Gaussian intensity, Gaussian concentration intensity and linear concentration intensity of photons; respectively deducing a distribution function of each photon distribution model under each intensity; performing convolution operation on the original point cloud image by using the convolution kernel of each intensity to obtain a Gaussian intensity graph, a Gaussian concentrated intensity graph and a linear concentrated intensity graph; acquiring the position of an interface field by using a Gaussian concentrated intensity graph, distinguishing seabed and sea surface signals according to the Gaussian intensity graph, and supplementing the terrain with the seabed signal loss of a part of sections by using a linear concentrated intensity graph; and fitting the Gaussian intensity graph according to the positions of seabed and sea surface interface fields, and carrying out reverse deduction to obtain parameters of each distribution model. Therefore, the automation process and precision of the flow of automatically identifying the submarine topography and the sea surface shape are improved.

This invention provides a solid-state long-range target pose detection device, comprising: a laser, a grating, an optical system, and a surface detector; the laser beam emitted is split by the grating to effectively illuminate the target; the beam reflected from the illuminated target is imaged by the optical system and then incident on the surface detector to obtain the target information; based on the target information, an albedo model of the target is calculated, and pose data is obtained based on the albedo model. This invention utilizes prior distribution to perform statistical analysis on the photon distribution obtained from reflection, ultimately achieving simultaneous detection of system contour, attitude, and unknowns. It effectively improves the system's detection throughput and efficiency, overcoming the shortcomings of traditional methods such as low efficiency and high inertia caused by the need for scanning mirrors, while also enabling the measurement of unknown targets.

The invention discloses an optical fiber light cone-CMOS coupling system photon transmission mechanism modeling method, and belongs to the technical field of physical simulation, and the method comprises the steps: constructing an optical fiber light cone-CMOS coupling system model, and carrying out the parameter initialization; wherein the optical fiber light cone-CMOS coupling system comprises a light source, an optical fiber light cone and a CMOS sensor; generating and tracking light rays by using the model, and carrying out a light ray-object intersection simulation test; and based on a light-object intersection simulation test result, calculating the transmittance of the optical fiber light cone and carrying out statistics on the spatial distribution and energy distribution conditions of photons on the surface of the CMOS sensor. According to the invention, the influence of different taper ratios and cone lengths on the optical transmission characteristics of the optical fiber cone and the photon distribution rule on the CMOS sensor can be explored, so that a theoretical basis and method support are provided for optimizing the structural design of an optical fiber cone-CMOS sensor coupling system and improving the coupling efficiency.

The application discloses a kind of extraneous data's spaceborne lidar terrain control point screening method, comprising: selecting ATL08 terrain point continuous strong light beam strip, generates along the track ground profile line using its ATL08 terrain point fitting;With each ATL08 terrain point in strong light beam strip as center, respectively create corresponding local zonal buffer zone;For each buffer zone, the height distance fitting elevation difference of ATL03 photon point in it is counted ATL03 photon point quantity distribution, and the corresponding density distribution curve is generated using Gaussian kernel density estimation method, and is recorded as photon distribution pseudo waveform;According to the morphological characteristics of photon distribution pseudo waveform, ATL08 terrain point is divided into grades, respectively corresponding plain shallow vegetation cover area, uneven vegetation density area, standard forest area and error point area.The application only relies on spaceborne lidar itself data source, removes the dependence on extraneous data, improves the screening efficiency of terrain control point.

The application discloses a random number generation method and device, and belongs to the technical field of computers. The method comprises the following steps: acquiring the bit number N of an integer random number to be generated, wherein N is a natural number greater than 1; acquiring photon distribution data on a screen in a double-slit interference experiment; randomly determining N regions in the screen corresponding to the photon distribution data; acquiring the number of photons received by the screen in each region based on the photon distribution data; and determining the value of a digit of the integer random number according to the number of photons received by the screen in each region, thereby obtaining the integer random number. The method improves the unpredictability of the generated random number by combining the uncertainty of the photon distribution data on the screen in the double-slit interference experiment and the random determination of the regions in the screen, thereby solving the problem of security risks in the use of random numbers in some random number application fields with high security requirements.

A modular lighting system includes several units of different configurations that can be combined to create lighting arrays in which the lighting elements are arranged in a staggered matrix. The units include a center square unit, linear units, and standard and reverse “L” units. Using these units a grow light array can be scaled to accommodate a given growing area while maintaining the staggered matrix arrangement of lighting elements within the array for optimum photonic distribution over the growing area.

The application belongs to the technical field of data processing and intelligent analysis, and particularly relates to a substation equipment fault feature identification method based on multispectral analysis, which comprises the following steps: acquiring infrared temperature distribution data and ultraviolet photon distribution data and aligning to obtain an infrared temperature distribution map and an ultraviolet photon distribution map; calculating infrared normalized rank values and ultraviolet normalized rank values based on the cumulative distribution characteristics of coordinate point intensity information, and calculating statistical correlation strength according to local joint distribution; obtaining fault saliency according to the spatial direction consistency of gradient vectors and the tail high value distribution characteristics of the infrared normalized rank values and the ultraviolet normalized rank values, and combining the statistical correlation strength; obtaining a fault region through adaptive threshold segmentation and spatial connectivity analysis, and outputting a position and a fault saliency mean value. The application reduces the risk of weak fault features being submerged by background noise in a complex environment, and improves the accuracy of fault identification.

The invention discloses a sea wave signal simulation method suitable for a satellite-borne photon counting laser radar. The sea wave signal simulation method comprises the following steps: (1) superposing wind waves generated by fast Fourier transform and surges simulated by a narrow-band Gaussian distribution model to realize sea wave modeling; (2) constructing space-time distribution of the number of photons returned by the laser emission time unit at the sea surface element; (3) time distribution of expected receiving photons is constructed in a point mode, and the number of expected noise photons is superposed; (4) calculating the number of photons reflected by the sea surface and returned by back scattering of the water body, and superposing the number of the photons to a corresponding receiving time element; (5) converting expected receiving photon distribution into detection possibility distribution, and simulating a receiving process by using a Monte Carlo method; and (6) changing the sea surface distribution along the trajectory, and repeating the steps (2)-(5) for a plurality of times to obtain sea wave point cloud signals detected by the spaceborne photon counting laser radar. The method can provide theoretical guidance for satellite-borne photon counting laser radar sea wave detection.