49 results about "Single photon imaging" patented technology

A gamma camera having a scintillation detector formed of multiple bar detector modules. The bar detector modules in turn are formed of multiple scintillation crystal bars, each being designed to have physical characteristics, such as light yield, to achieve a sufficient spatial resolution for nuclear medical imaging applications. According to another aspect of the invention, the bar detector modules are arranged in a three-dimensional array, where each module is made up of a two-dimensional array of bar detectors with at least one photosensor optically coupled to each end of the module. Such a camera can be used for both PET (coincidence) and single photon imaging applications. According to another aspect of the invention, a bar detector gamma camera is provided, which utilizes an improved positioning algorithm that greatly enhances spatial resolution in the z-axis direction (i.e., the direction along the length of the scintillation crystal bar).

A gamma camera having a scintillation detector formed of multiple rotating bar detector modules arranged in a ring configuration, with synchronized spin motion of each module. Such a camera can be used for both PET (coincidence) and single photon imaging applications. Image reconstruction is obtained using either an inverse 3-D Radon transform or a 3-D fan-beam algorithm.

A gamma camera having a scintillation detector formed of multiple bar detector modules. The bar detector modules in turn are formed of multiple scintillation crystal bars, each being designed to have physical characteristics, such as light yield, to achieve a sufficient spatial resolution for nuclear medical imaging applications. According to another aspect of the invention, the bar detector modules are arranged in a three-dimensional array, where each module is made up of a two-dimensional array of bar detectors with at least one photosensor optically coupled to each end of the module. Such a camera can be used for both PET (coincidence) and single photon imaging applications. According to another aspect of the invention, a bar detector gamma camera is provided, which utilizes an improved positioning algorithm that greatly enhances spatial resolution in the z-axis direction (i.e., the direction along the length of the scintillation crystal bar).

The invention discloses a non-scanning single photon imaging detecting laser radar comprising a wide-spectrum pulse module, a two-dimensional dispersion light transceiver module, and a signal detection module. The wide-spectrum pulse module is used for outputting wide-spectrum pulse light. The two-dimensional dispersion light transceiver module is used for carrying out two-dimensional dispersion on the wide-spectrum pulse light at a preset light path, generating a two-dimensional dot-matrix detection light, outputting the light, detecting a detection target, receiving the two-dimensional dot-matrix detection light, and outputting feedback detection light after reversed passing of the preset light path. The signal detection module is used for carrying out dispersion on the feedback detection light, carrying out single photon counting imaging, and carrying out analysis processing to obtain information of the detection target. According to the invention, the two-dimensional dispersion light transceiver module is used for carrying out two-dimensional dispersion on the wide-spectrum pulse light to form the two-dimensional dot-matrix detection light and the wavelength component in the light is applied fully; the scanning situation is avoided; and the detection target is detected by using the single photon and single photon counting imaging is used for processing, so that the remote detection is realized.

The invention provides a single-photon imaging laser radar system based on a wide-spectrum light source. The laser radar system is characterized in that a wide-spectrum light source is used for emitting the wide-spectrum detection light, a light processing module is used for filtering out detection light of a working waveband from the wide-spectrum detection light and carrying out repetition frequency selection and time domain dispersion, an intensity modulation module is used for dividing the detection light into a plurality of detection light with different frequencies, a scanning transceiving module is used for carrying out spatial dispersion of a plurality of detection light and carrying out scanning emergence of a plurality of detection light in combination with mechanical scanning soas to form a two-dimensional detection light dot matrix so that target detection is carried out through the two-dimensional detection light dot matrix, and the detection light reflected back by a target is received, a detection module is used for detecting the photon number of the reflected detection light, and an imaging module is used for carrying out 3D imaging according to the photon number data of the detection light. The laser radar system is advantaged in that the target is detected through the two-dimensional detection light dot matrix, the detection field of view of the radar systemis large, and the imaging speed is high.

The invention relates to the technical field of photoelectric imaging detection, and particularly relates to a single photon imaging detector and a manufacturing method thereof. The manufacturing method comprises the following steps: a silicon substrate microchannel plate is manufactured, and a micro through hole array is arranged in the silicon substrate microchannel plate; a CMOS (Complementary Metal Oxide Semiconductor) imaging sensor array is manufactured; a photoelectric cathode is manufactured and tested in a packaging device, device wafer level structural integration is carried out on the silicon substrate microchannel plate, the CMOS imaging sensor array and the photoelectric cathode, the single photon imaging detector is formed, and the single photon imaging detector is tested. The wafer level packaging processing technology is adopted, the photoelectric cathode, the silicon substrate microchannel plate and the CMOS imaging sensor array are directly coupled, and a high-flexibility, high-speed, high-resolution, low-cost, low-power consumption, high-frame frequency, no-cooling and compact-size single photon imaging detector.

The invention provides a diamond NV color center fluorescence high-efficiency collection device, belongs to the field of diamond NV color center fluorescence detection, and is expected to be applied to various quantum detection devices such as a diamond NV color center-based quantum computer, a gravity gradiometer, an accelerometer, a thermometer and a single-photon imager. According to the technical scheme, in-phase double collection of red fluorescence and far infrared fluorescence is adopted, and the fluorescence collection proportion is greatly increased; fluorescence excited by a diamondNV color center is reflected by a parabolic reflector, parallel focusing is performed by a Fresnel plane lens, and under the combined action of a shading cylinder, light dissipation is reduced to themaximum extent, and efficient gathering of the fluorescence is realized; the axial helical antenna with high directivity and high gain is adopted to provide high-efficiency microwave excitation, so that high-efficiency optomagnetic resonance is realized, and the intensity of red fluorescence generated by the diamond NV color center is increased.

The invention provides a single-photon imaging radar system. The system comprises a signal source which is used for generating a synchronization signal and a gating signal; a fiber laser is used for receiving the synchronizing signal and responding to the synchronizing signal to emit a laser pulse; a first optical switch and a second optical switch are used for receiving the gating signal and responding to the gating signal to be opened or closed so as to control whether the laser pulse passes through the optical switches or not; a light splitting device is used for receiving the laser pulse transmitted by the first optical switch and transmitting the laser pulse to the optical transceiver board, or used for receiving the laser pulse transmitted by the optical transceiver board and transmitting the laser pulse to the second optical switch; an optical transceiver board; a single-photon detector is used for receiving the gating signal and the laser pulse, opening or closing in response to the gating signal, generating a detection signal in response to the laser pulse when the single-photon detector is opened, and transmitting the detection signal to the time-to-digital converter; and a time-to-digital converter is used for receiving the synchronization signal and the detection signal and recording time information.

The invention provides an area array all-fiber single-photon camera based on frequency up-conversion. With introduction of an optical fiber array and a multi-channel periodically poled lithium niobatewaveguide module structure, a free operation mode at a room temperature can be realized; meanwhile, mutually independent, high-efficiency and low-noise single photon detection is provided for each pixel point, and the single photon imaging detection distance, imaging resolution and imaging rate in the area array camera are improved.

The invention belongs to the technical field of laser radars, and particularly relates to a high-noise single-photon three-dimensional reconstruction method based on a multi-stage degeneration neural network. The method solves the problems that a classical single-photon imaging method is poor in imaging effect under the low signal photon to background noise ratio, some hyper-parameters need to be adjusted to maintain precision and calculation efficiency, and practicability is limited. The method mainly comprises the following steps that 1, a data set is obtained; step 2, constructing a multi-stage degeneration neural network for single photon reconstruction; 3, training the network by using the training set, verifying the network, and observing whether the trained network achieves an expected effect or not; and step 4, inputting test set data into the network to realize strong-noise single-photon three-dimensional reconstruction, and recovering a depth map.

A multi-modality imaging system for imaging of an object under study, e.g., a whole body or parts of the body of animals such as humans, other primates, swine, dogs, rodents (especially mice and rats), that includes a magnetic resonance imaging apparatus and a cadmium zinc telluride (CZT)-family semiconductor, single-photon imaging apparatus in close proximity such that sequential or simultaneous imaging can be done with the two modalities using the same support bed of the object under study in the same, uninterrupted imaging session.

The invention provides a photon-level spatial mapping correlation measurement method based on a single photon imaging device. The quantum variables in the target space are converted into the positionvariables of photons by the detection device. The correlation of the target spatial variables is transformed into the correlation of the position spatial variables. Performing photographing frame by frame according to the time sequence by the detection device and performing division according to the time interval, and the temporal correlations events in the division are recorded in the correlationmatrix so as to construct the time-related correlation matrix. In the position space, the spatial correlation of the photons is obtained by using the detection device, and temporal correlation measurement and non-temporal correlation measurement of the target spatial variables are realized indirectly. The gate width time of the imaging system is set, the temporal correlation and non-temporal correlation information is measured and the continuity is recovered by using the Fourier filtering mode.

The invention relates to a single-photon imaging system simulation model based on a back scattering model and a modeling method. The problem that an existing imaging system modeling method cannot accurately achieve underwater single-photon imaging system modeling is solved. The method comprises the following steps of: a back scattering light power parameter is determined by giving related parameters; then, the number of echo photons and background noise under unit reflectivity is obtained, and meanwhile, dark counting of the system is considered, so that all signals received by the single-photon detector are formed; finally, expectation of echo signals is obtained through an observation equation, the response process of the system is modeled into Poisson distribution, a reference response function is designed into a Gaussian function model containing exponential components, and then a simulation model of the underwater single photon imaging system is obtained. By using the model, the imaging capability of the single photon imaging system for the underwater target under different device parameters and attenuation lengths can be verified through matched filtering, and certain guidance and reference effects are provided for realizing imaging with higher attenuation lengths in the future.

The invention discloses a photoelectric imaging sensor, which comprises a filter layer and an imaging unit. The filter layer is composed of a plurality of filter units. Each filter unit comprises fourfilter areas, and red light, green light, blue light and broad-spectrum light are allowed to pass through the four filter areas respectively. The imaging unit is used for receiving the light passingthrough the light filtering layer and imaging. The sensor comprises a visible light imaging unit and a single-photon imaging unit. The filtering areas allowing red light, green light and blue light topass through correspond to the visible light imaging unit, the filtering areas allowing wide-spectrum light to pass through correspond to the single-photon imaging unit, and the single-photon imagingunit is used for receiving weak light signals penetrating through the wide-spectrum filtering areas and amplifying the weak light signals in a high-multiple mode to generate images. Based on a detected scene environment, a color image or a black and white night vision image can be generated, and the single-photon imaging unit receives the weak light signal and amplifies the signal by a high multiple to reach a photoelectric detection sensitivity range to generate an image, so that the sensitivity, signal-to-noise ratio and definition of the sensor are effectively improved.

The invention relates to an imaging performance test system for a Geiger-mode 3D laser imaging focal plane array detector, and belongs to the technical field of photoelectric detection. The system uses a narrow pulse semiconductor laser as a light source, and compared with a large-power solid state laser used for outfield imaging test, the narrow pulse semiconductor laser is small in size, low inpower and cost and capable of adjusting the output optical power, and is an ideal laser source which realizes extremely weak light irradiation of a target. A camera obscura is used to isolate stray light in the environment outside a casing, so that the accuracy of single-photon imaging detection is ensured; laser output delay of the narrow pulse semiconductor laser as well as the distance betweenthe detector and a target is adjusted to simulate imaging detection of a long-distance target indoor; and the distance between two offset targets is adjusted, so that extreme distance / resolution imaging detection of the detector can be realized. The imaging performance of the Geiger-mode 3D laser imaging focal plane array detector can be tested indoor rather than in the outfield.

The invention relates to a sensing and calculation integrated single-photon imaging chip and method, and the chip mainly consists of a single-photon photosensitive counting array, a convolution calculation column processing circuit, a row selection circuit and the like. A convolution weight is written into a column processing circuit in advance, pixels of a chip array count the number of photons and register the number of photons in the pixels, a sequential control circuit transmits photon data in the chip array to the column processing circuit row by row, the photon data and the pre-stored convolution weight are multiplied and added, and the photon data in the chip array are stored in the column processing circuit. Therefore, the convolution calculation of the array photon image and the convolution kernel weight is realized. According to the chip, a convolution calculation function is fused in a traditional single-photon imaging architecture, and the chip has the characteristic of integration of sensing and calculation. The chip can quickly extract weak image features and greatly compress the output single-photon imaging data volume.

A multi-modality imaging system for imaging of an object under study, e.g., a whole body or parts of the body of animals such as humans, other primates, swine, dogs, rodents (especially mice and rats), that includes a magnetic resonance imaging apparatus and a cadmium zinc telluride (CZT)-family semiconductor, single-photon imaging apparatus in close proximity such that sequential or simultaneous imaging can be done with the two modalities using the same support bed of the object under study in the same, uninterrupted imaging session.

The invention discloses a target real-time tracking control method and system. The method comprises the steps of calculating a short-wave infrared field of view A and an area array single-photon imaging field of view B, extracting pixel coordinates of a suspicious target in the field of view A, judging whether the suspicious target is in the field of view B or not, if not, rotating a rotary table to enable the suspicious target to fall in the field of view B, and identifying whether the suspicious target is a target to be tracked or not through single-photon three-dimensional imaging. And performing three-dimensional imaging on the to-be-tracked target according to the time interval, and fitting a three-dimensional trajectory equation to follow and aim the to-be-tracked target in real time. The system comprises a view field calculation module, a passive short-wave infrared imaging module, an active area array single-photon imaging module, a pixel coordinate extraction and judgment module, a target identification module, a real-time tracking module and a two-dimensional turntable. According to the method and the device, rough positioning and reliable extraction of the suspicious target can be rapidly realized, and the motion track can be predicted in real time by using historical data of the target, so that a reference is provided for capturing the target again after the target is lost.

The invention discloses a single-photon imaging system based on polarization noise reduction. The single-photon imaging system comprises a laser, a polarization beam splitter, a signal light module, a pump light module, a beam combiner, a sum frequency module and a single-photon detector. The polarization beam splitter divides laser into signal light and pump light which are perpendicular to each other, the vertical polarization signal light is converted into horizontal polarization signal light through the signal light module, the horizontal polarization signal light and the horizontal polarization pump light are combined into one path of laser, the laser is converted into sum frequency light through the sum frequency module, and the sum frequency light is detected through the single-photon detector. According to the system, through simple combined use of the polarization beam splitter, the polarization analyzer, the wavelength division multiplexer and the beam combiner, the sum frequency efficiency of nonlinear optics can be effectively improved, and the anti-noise performance of the system is improved.

The invention relates to a 10.6[mu]m single-photon detector based on frequency up-conversion and a performance test experimental device based on the single-photon detector. In the 10.6[mu]m single-photon detector, a ridge-shaped waveguide structure is designed based on an OP-GaAs thin film and used for converting long-wave infrared single photons to a short-wave infrared band in a sum frequency mode, then a mature short-wave infrared single-photon detector is adopted for detection, so that single-photon detection is achieved on the long-wave infrared band, and all-weather free space quantum key distribution, infrared single-photon imaging and single-photon laser radar become possible. Moreover, with the help of the single-photon detector, single-photon detection in a room-temperature environment can be realized, and low-temperature limitation can be avoided, so that the structure of the single-photon detector can be greatly simplified, the requirement of the single-photon detector on a use environment is reduced, the use and maintenance costs are reduced, and the application range of the single-photon detector is expanded.

The invention discloses a superconducting nanowire single-photon detector. The detector comprises a bent fractal nanowire structure and an optical cavity structure; the bent fractal nanowire structureis used for relieving the current crowding effect and achieving the effect that the detection efficiency is insensitive to the polarization state of incident photons, and the bent fractal nanowire structure comprises parallel bent fractal nanowires and series bent fractal nanowires; and the optical cavity structure is used for realizing simultaneous optimization of internal quantum efficiency andabsorption efficiency. The detector can be widely applied to the fields of optical communication, single-photon imaging, fluorescence detection, quantum optics and the like, and the development and progress of the fields can be remarkably promoted due to the excellent performance of the detector.

The invention provides a single-photon imaging image processing method. The single-photon imaging image processing method comprises the following steps: (101) discriminating single-photon signals of single-frame original data; (102) counting and storing single-frame single photons; (103) counting, superposing and storing a plurality of frames of single photons; and (104) realizing single photon counting gray value imaging. Effective single photon signal discrimination is realized through local contrast normalization and Gaussian kernel template extraction, the detector reading noise and dark noise counting influence is effectively suppressed, the image quality and the imaging effect are improved by combining multi-frame single photon counting imaging, and the method is suitable for two-dimensional large-area array single photon imaging and low-light detection.

The invention relates to a single-wavelength two-photon STED and dual-wavelength single-photon STED coupled imaging device comprising a femtosecond laser device, a picosecond laser device, an I electric shutter, an I half wave plate, an I optical splitter, an II optical splitter or an I reflector switching device, an II half wave plate, an I quarter wave plate, an II electric shutter, an II reflector, an III reflector, an I relay reflector group, an IV reflector, an I dichroic mirror, a V reflector, an II relay reflector group, a VI reflector, a glass rod, an III half wave plate, a polarizer,a VII reflector, an I lens, a polarization maintaining optical fiber, an II lens, a VIII reflector, a phase plate, an IX reflector, an enhancing optical path reflector group and a confocal scanning microscope. The imaging device provided by the invention can be switched to the single-wavelength two-photon STED imaging system and the dual-wavelength single-photon imaging system in a time-sharing manner according to needs.

The invention belongs to the technical field of laser radars, and particularly relates to a target information automatic extraction method and system for single photon imaging in a strong noise environment. The problem that an existing single-photon imaging technology based on high-speed electronic gating is limited in practicability due to the fact that target distribution information is unknown and the existing single-photon imaging technology depends on manual design and parameter adjustment is solved. The method mainly comprises the steps of collecting original three-dimensional echo data, determining algorithm initial parameters, estimating an algorithm initial gating threshold value m and a corresponding algorithm gating range, calculating a current residual value and a gating range correction value, and updating the algorithm gating threshold value and the gating range. According to the method, a gating time interval does not need to be preset, and a large dynamic range of echo signals is ensured; and the extraction of a target signal is realized by adopting algorithm-level gating, so that the signal-to-noise ratio of the signal is greatly improved.

The invention provides a high-dynamic-range compressed sensing imaging system and method based on random jitter. The system comprises an optical unit (12) and an electrical unit (13). The optical unit (12) comprises a first imaging lens (1), a spatial light modulator (2), a collection module (3), a dodging module (4), a light source (5), a shaking component (6), a second imaging lens (7) and a light splitting module (8); the electrical unit (13) comprises a detector (9), a control module (10) and a storage and calculation module (11). According to the method, random jitter is introduced into compressed sensing imaging, and the problem of large quantization error caused by insufficient detector bits is solved; the jitter frequency is increased, and the quantization error is further reduced; therefore, the method has wide application value in the fields of dynamic imaging and single-photon imaging with limited sampling time and detector conditions.

The invention relates to a single-photon imaging system simulation model and modeling method based on a backscattering model. It solves the problem that the existing imaging system modeling method cannot accurately realize the modeling of the underwater single-photon imaging system. The present invention determines the backscattered light power parameters by giving relevant parameters; then obtains the number of echo photons and background noise under the unit reflectivity, and considers the dark count of the system at the same time to form all the signals received by the single photon detector . Finally, the expectation of the echo signal is obtained through the observation equation, in which the response process of the system is modeled as a Poisson distribution, and the reference response function is designed as a Gaussian function model with exponential components, and then the simulation model of the underwater single-photon imaging system is obtained. Using this model, the imaging capability of the underwater single-photon imaging system for underwater targets under different device parameters and attenuation lengths can be verified through matched filtering, which has certain guidance and reference for future imaging with higher attenuation lengths.

The invention discloses a photon camera ultra-high-speed single-photon imaging device, which comprises a photon array detector, an array threshold value generator, a complete machine control and processing transmission unit, and an array position recorder. The invention realizes the imaging of the photon camera capable of realizing single-photon sensitivity at extremely high speed.