64 results about "Coherent imaging" patented technology

The invention discloses a robot-assisted real-time three-dimensional Doppler OCT (optical coherence tomography) angiography method and system, relates to the technical field of medical imaging, and can be used for carrying out real-time and large-view-field three-dimensional Doppler optical coherence imaging evaluation during a microvascular anastomosis operation and improving the anastomosis operation evaluation accuracy and efficiency. According to the system, a spectral domain optical coherence tomography system SD-OCT is used for performing spectral domain optical coherence tomography on a sample to obtain a sample cross-sectional image, and the sample cross-sectional image is sent to a display to be displayed. The OCT imaging probe and the binocular depth camera are integrally installed at the tail end of the robot arm, and the robot arm operates the OCT probe and the binocular depth camera to move to different positions and angles to image a sample. The OCT imaging probe collects optical signals reflected by a sample, and the signal processing host and the displayer receive spectral signals transmitted by the OCT imaging probe and display the three-dimensional structural characteristics of the microvessel and the blood flow velocity condition in the blood vessel.

The invention discloses a one-dimensional ultra-wide field-of-view ultra-high spectral resolution dispersion coherent imaging spectrometer, which belongs to the technical field of spectral imaging, and comprises a first microlens array used for obtaining incident light of a one-dimensional ultra-wide field-of-view in a horizontal plane; the plurality of optical fibers are used for transmitting incident light of a one-dimensional ultra-wide field of view; the second micro lens array is used for collimating incident light from each optical fiber into broadband parallel light beams; the grating beam splitter interferometer is used for dispersing the broadband parallel light beams into a plurality of narrow-band parallel light beams with different propagation directions; the cylindrical lens is used for converging the two paths of coherent light of each narrow-band parallel light beam to a target block of the detector, and converging the narrow-band parallel light beams with different propagation directions to different target blocks respectively; and the detector is used for obtaining a continuous broadband ultra-high resolution spectrum according to the two paths of coherent light received by each target block. According to the invention, a one-dimensional ultra-wide field of view is obtained in a horizontal plane, and ultra-high spectral resolution can be obtained.

Methods and systems are provided for using optical interferometry in the context of material modification processes such as surgical laser or welding applications. An imaging optical source that produces imaging light. A feedback controller controls at least one processing parameter of the material modification process based on an interferometry output generated using the imaging light. A method of processing interferograms is provided based on homodyne filtering. A method of generating a record of a material modification process using an interferometry output is provided.

A composite inspection system and method for aviation is provided. NDI system and method for the non-destructive inspection of aeronautical composite parts, comprising:-an ultrasound inspection device for generating raw inspection data of the composite part by using phased array, full focus method and phase coherent imaging; -a computed tomography module for obtaining information of the volume of the composite component; -data processing means of cloud shared resources configured to: receive and process raw inspection data from the ultrasound inspection device and information from the computed tomography module, and to apply an AI model created for identifying defects within the composite part, the AI model is trained using an inspection data set obtained from ultrasound and computed tomography inspections and is configured to classify defects of the composite part according to a list of defect types and to provide a classification output to make a decision.

A computing system may be provided. The computing system may include an optical memory cavity configured to store signal pulses representing a current combination for a combinatorial optimization computation. The computing system may further include an optical processing cavity. The optical processing cavity may be configured to receive the signal pulses from the optical memory cavity, perform an all-optical 1-bit delay computation on the signal pulses to generate a feedback pulse for at least one signal pulse, and provide the feedback pulse to be coupled back to the optical memory cavity.

The invention discloses a phase difference wavefront-image estimation method based on depth image prior. The method comprises the following steps: firstly, constructing a forward physical model of an incoherent imaging system, and generating an observation image with out-of-focus aberration by introducing phase difference; and then using a depth image prior network to jointly optimize image domain loss and wavefront domain loss under the condition of no external training data by taking the consistency of an observation image and a model generation image as a constraint so as to simultaneously obtain a high-quality recovered image and accurate wavefront estimation. The method provided by the invention can realize accurate wavefront estimation and high-quality image recovery under the condition of large aberration under the condition of only needing a small number of acquired images, and has the advantages of strong anti-noise capability, no need of an additional wavefront sensor and low system complexity. The method can be widely applied to fluorescence microscopic imaging and other high-resolution microscopic imaging technologies, and the imaging resolution and the image quality are improved.

The application relates to a method for optimizing multimodal imaging and a multimodal imaging system. Based on the multimodal imaging system, an optical coherence imaging module converts collected optical coherence imaging signals into interference photoelectric signals, an optical phase extraction module calculates a wavefront phase diagram according to the interference photoelectric signals, and an adaptive signal processing module generates a driving signal according to the wavefront phase diagram, so that a spatial light modulator in an adaptive optical module is dynamically controlled, the spatial light modulator dynamically adjusts the wavefront phase of incident laser, higher-precision wavefront distortion compensation is realized, and the imaging quality of the multimodal imaging is optimized. The method utilizes the deep penetration and layer cutting capabilities of the optical coherence imaging mode, simultaneously has full field of view and high-speed regulation and control capabilities, accurately adjusts the phase, and realizes adaptive optimization. The method provided by the application improves the overall imaging effect of the multimodal imaging, and promotes the wide application of the multimodal imaging system in the fields of disease detection and scientific research.

The invention relates to a four-mode synchronous imaging system and method based on chirped pulse amplification. The four-mode synchronous imaging system comprises a light source module, a photoacoustic light source broadening module, an optical coherence imaging module, a first light path conduction module, a high-speed scanning module, a second light path conduction module, an image acquisition module, a detection module and a photoacoustic signal processing module, and the light source module comprises a chirp amplification laser; the four-mode synchronous imaging system effectively realizes simultaneous detection of four imaging modes through a single parameter chirp amplification laser in combination with advanced optical and image processing technologies, improves the multi-dimensional information acquisition capability of imaging, simplifies the design of a multi-mode microscopic imaging system, reduces the complexity and cost of the system, and improves the detection efficiency. Meanwhile, the imaging efficiency and accuracy are improved, synchronous detection of various biological information can be achieved, and the method has wide application prospects, especially in the fields of medical pathology detection, neuroscience and the like.

Systems and methods for static and dynamic calibration can be used to provide alignment of a measurement beam from a coherent imaging (CI) measurement system relative to a processing beam from a material processing system. In these systems and methods, calibration measurement outputs can be obtained from the CI measurement system and / or from auxiliary sensors. Future measurements performed by the CI measurement system can be modified based, at least in part, on the calibration measurement outputs.

A system for coherence imaging may receive ultrasound signals each having a respective delay associated with a respective ultrasonic transducer element in an ultrasonic transducer array. The system may obtain an approximation of the auto-correlation of ultrasound signals without any auto-correlation calculation, and determine the output image based on the approximation. In approximating the auto-correlation, the system may group the ultrasound signals into multiple portions, each corresponding to a respective sub-aperture of a plurality of sub-apertures of the ultrasonic transducer array. The system may determine a coherent sum of signals for each sub-aperture, perform a square operation or magnitude square operation over the coherent sum to obtain resulting data, normalize the resulting data, and sum the resulting data for all of the sub-apertures to generate the output image. A sub-aperture in the plurality of sub-apertures may overlap with another sub-aperture.

Ophthalmological images generated by coherent imaging modalities have multiple types of noise, including random noise caused by the imaging system and speckle noise caused by turbid objects such as living tissues. These noises can occur at different levels in different locations. A noise-reduction method and system of the present disclosure thus relates to applying different filters for different types of noise and / or different locations of images, sequentially or in parallel and combined, to produce a final noise-reduced image.

The invention provides a dual-wavelength super-radiation light-emitting diode and a preparation method thereof, and the dual-wavelength super-radiation light-emitting diode comprises a substrate, a first semiconductor cladding, a first light limiting layer, a quantum well active layer, a second light limiting layer and a second semiconductor cladding which are stacked. A ridge waveguide structure is arranged on the surface of one side, far away from the second light limiting layer, of the second semiconductor cladding; wherein the quantum well active layer comprises a first light-emitting layer and a second light-emitting layer, the second light-emitting layer and the first light-emitting layer are arranged on the same layer and adjacent to each other, the first light-emitting layer can emit first light with the wavelength being lambda 1, the second light-emitting layer can emit second light with the wavelength being lambda 2, and lambda 1 is smaller than lambda 2; the ridge waveguide structure is used for guiding the first light and the second light and converging the first light and the second light on the same light-emitting surface for emission. According to the invention, the spectral bandwidth limitation of a single-wavelength device can be obviously broken through, and the requirements of optical fiber sensing, coherent imaging and the like on a wide-spectrum light source can be met; meanwhile, the total output power is improved on the premise that the size of the device is not increased.

The present disclosure provides an intelligent modular frame system configured with one or more connectable frame devices, each frame device having at least one universal port for connection to one of various types of functional modules. The functional module includes display devices that, when connected together in an arrangement of frame devices, can form a single display matrix having coherent imaging across a plurality of display panels thereof. The functional modules also include one or more charging pack modules having port arrays for charging various battery types according to manufacturer specifications. The modular framework system adapts to its environment in both function and shape, and can provide basic public services in coordination with a cloud network operating system.

Systems and methods for static and dynamic calibration may be used to provide alignment of a measurement beam from a coherence imaging (CI) measurement system relative to a processing beam from a material processing system. In these systems and methods, a calibration measurement output may be obtained from the CI measurement system and / or from an auxiliary sensor. Future measurements performed by the CI measurement system may be modified based on, at least in part, the calibration measurement output.

The present invention discloses a photon enhancement apparatus comprising a reflective component and 4f coherent imaging system, which increases a photon collection efficiency. The present invention also provides a microscope comprising said photon enhancement apparatus and methods of improving photon collection efficiency, signal-to-noise ratio, and / or optical resolution using the said photon enhancement apparatus.

The invention relates to the technical field of coal mining and rock stratum control, in particular to a deep well composite roof coal face surrounding rock stability control method, device and equipment based on structure-mining-induced stress superposition. According to the method, by constructing a unified time-frequency baseline and full-waveform observation, staggered-frequency coupling recognition and shearing embryo area positioning are achieved, a shearing chain topological structure is constructed through coherent imaging, active intervention and dynamic regulation and control are achieved in combination with a feed-forward vibration suppression surface, an energy anchor point and a self-adaptive rock anchor network, shearing chain connection is effectively blocked, and the positioning accuracy of the shearing embryo area is improved. The surrounding rock stability and the coal mining safety are improved.

The present invention discloses a self-witnessed coherent imaging system for artifact removal and noise filtering. The system comprises an interconnected processing light source, a broadband light source, a fiber optic beam splitter, a dichroic mirror, an optical lens, a spectrometer, a reference arm, and a sample arm. The optical beam generated by the broadband light source is split into two parts by the fiber optic beam splitter, one of which enters the reference arm; the other part is combined with the processing light by the dichroic mirror, and then focused onto the sample arm spot by the optical lens. The imaging light returning from the sample arm and the reference arm is recombined at the fiber optic beam splitter and enters the spectrometer. When the system provided by the present invention is applied to laser welding of 316L stainless steel, the keyhole tracking rate is improved by 67%, autocorrelation artifacts are completely eliminated, the signal-to-noise ratio is doubled, and there is no loss in imaging rate or spatial resolution. No balanced detection or dedicated light source is required.

Methods and systems are provided for using optical interferometry in the context of material modification processes such as surgical laser or welding applications. An imaging optical source that produces imaging light. A feedback controller controls at least one processing parameter of the material modification process based on an interferometry output generated using the imaging light. A method of processing interferograms is provided based on homodyne filtering. A method of generating a record of a material modification process using an interferometry output is provided.

A coherent imaging system including a transmitter and a receiver. The transmitter includes a coherent source and a power splitter for splitting the electromagnetic radiation into a reference and a signal beam. The receiver includes an image forming device and an array of pixels. Each of the pixels include means for collecting at least a portion of the signal beam imaged on the pixel by an image forming device, as a collected signal; means for splitting the collected signal into a plurality of collected signals each having different phase shifts; means for mixing each of the collected signals with the reference beam so as to form a plurality of mixed signals; and means for detecting the mixed signals and outputting a plurality of output electrical signals in response to the mixed signals.

The application provides an intraoperative real-time optical coherence imaging guided laser ablation treatment system, which comprises an optical guiding module, a laser treatment module and a real-time monitoring and feedback module; high-resolution three-dimensional information and blood vessel function information obtained by the optical coherence imaging guiding module are used to accurately segment the region of a tumor site, and the power and irradiation time of a radiation laser light source are accurately controlled according to the information; meanwhile, a temperature sensor monitors the tissue temperature at any time, and the system pauses laser diagnosis and treatment when the temperature exceeds the set threshold range, so that precise laser ablation treatment is realized; the application aims to overcome the problems that the current laser ablation treatment lacks real-time and accurate segmentation of tumor regions and lacks real-time monitoring and feedback of the tissues around the tumor during the operation, so that real-time and accurate laser ablation treatment of the tumor site during the operation is realized.

This invention provides a coherent imaging device and method, belonging to the field of photoelectric detection and three-dimensional imaging technology. The device includes: an FMCW laser outputting swept light; a beam splitter dividing the swept light into a measurement branch light, a local oscillator branch light, and a reference branch sampling light; a measurement interferometric branch outputting a measurement beat frequency signal; a reference interferometric branch outputting a reference beat frequency signal using an optical frequency comb; a digital processing module compensating the measurement beat frequency signal based on the reference beat frequency signal and generating a scanner drift observation; using the compensation result and the drift observation to jointly estimate geometric parameter errors and phase drift errors; performing geometric mapping correction and fine phase compensation based on the estimation results; and outputting a coherent three-dimensional point cloud or a coherent detection image. Using this invention can improve the phase consistency and three-dimensional point cloud quality of coherent imaging.

The application discloses a non-coherent optical convolution calculation system and method for multiple convolution kernel parallel calculation; the system comprises an imaging lens, an optical convolution modulation unit, an imaging detection unit, a readout circuit and a processing unit; the optical convolution modulation unit is used for modulating incident non-coherent light field, so that the system forms a plurality of point spread function responses corresponding to target convolution kernels; the imaging detection unit is used for converting optical signals into electrical signals; the processing unit is used for differentiating different channel outputs to obtain convolution feature maps corresponding to the plurality of convolution kernels; the application maps a plurality of target convolution kernels into a plurality of point spread functions in a non-coherent imaging system, and utilizes positive kernel and negative kernel decomposition and a multi-channel parallel mechanism to realize parallel optical convolution calculation of the plurality of convolution kernels under single exposure condition; and the application can be applied to the fields of edge enhancement, feature extraction, optoelectronic hybrid convolution neural network, target recognition and intelligent visual perception.

The invention relates to the technical field of data processing, and discloses a method, a system, equipment and a medium for estimating a hidden area of a pilot of a black-flight unmanned aerial vehicle, and the method comprises the steps: measuring an electromagnetic signal of remote control equipment of the black-flight unmanned aerial vehicle through multiple mobile wireless direction finding equipment, so as to carry out the angle difference and energy estimation of the remote control equipment of the black-flight unmanned aerial vehicle; therefore, an estimation result of each mobile wireless direction finding device is obtained; carrying out incoherent imaging on the plurality of estimation results to obtain an imaging result obtained by carrying out incoherent superposition on the plurality of estimation results; and the moving direction and the moving distance of the mobile wireless direction finding equipment are controlled according to the imaging result and the estimation result, so that the mobile wireless direction finding equipment moves to a preset position, and then the first step is returned until the area where the black flight unmanned aerial vehicle remote control equipment is located is locked. According to the invention, only two antennas are utilized to carry out orientation estimation, at least two devices are needed to realize target signal area search, the method has the advantages of low cost and accurate result, and powerful support can be provided for subsequent photographing and evidence obtaining.

Various examples of the present disclosure relate to coherent imaging techniques, such as digital holography or Fourier ptychography. And the aberration is corrected. And correcting the aberration according to the field position.

The application discloses a kind of real aperture radar adaptive combination regularization angle super-resolution imaging methods, first, the acquisition and preprocessing of echo data are carried out, regularization objective function is constructed, then by calculating normalized weighting matrix, and iteration initialization is carried out, weight factor is updated, finally, the target scattering coefficient is updated, and the azimuth super-resolution imaging result of entire echo matrix is obtained.The method of the application combines generalized sparse norm and generalized total variation norm as constraint term, while enhancing angle resolution and expanding target edge information, then using the iterative reweighting method based on data driving, the selection of regularization parameter is avoided, the number of manually selected parameters is reduced, compared with the existing combination norm method, it has stronger scale information reconstruction capability, and improves the scale reconstruction accuracy of real aperture radar on extended target.

This application discloses a low-coherence imaging quality evaluation method, device, and electronic device, relating to the field of laser welding monitoring technology. The method includes: acquiring point cloud data related to a keyhole during laser welding, and obtaining a peripheral point cloud projection of the keyhole based on the point cloud data; performing a keyhole region fitting process multiple times to determine the keyhole region based on the fitting parameters obtained during each fitting process; wherein, during each fitting process, a coordinate system is constructed based on the peripheral point cloud projection and gridded according to a preset scale, and the fitting parameters of the keyhole region are determined based on the grid parameters of each grid; the preset scale varies between fitting processes; and an imaging quality evaluation result is determined based on the point cloud data within the keyhole region and the area of ​​the keyhole region. This method thereby evaluates the accuracy of key depth information collected via optical low-coherence imaging, providing a prerequisite for online key depth monitoring during laser welding.

The present application relates to the technical field of trabecular meshwork fenestration surgery, and discloses a method and device for predicting intraocular pressure parameters after trabecular meshwork fenestration surgery, which is based on a phase optical coherence imaging method to obtain the trabecular meshwork elasticity parameters of different sections in the patient's eye and the three-dimensional reconstructed intravenous image of the trabecular meshwork; the fluid collection tube features are extracted from the three-dimensional reconstructed intravenous image of the trabecular meshwork; the trabecular meshwork elasticity parameters and the fluid collection tube features are input into a trabecular meshwork tissue constitutive model to determine the target fenestration position of the trabecular meshwork, so as to simulate the trabecular meshwork fenestration surgery operation; based on the simulation result of the trabecular meshwork fenestration surgery operation, the intraocular pressure parameters after the trabecular meshwork fenestration surgery corresponding to the target fenestration position of the trabecular meshwork are predicted, and therefore, the success rate of the trabecular meshwork fenestration surgery can be finally improved.

The phase-based approach may be used for one or more of acquiring, storing, or subsequently analyzing the acquired acoustic imaging data. Such a phase-based method may include coherently summing a normalized representation or a quantized representation of A-scan data corresponding to phase information. Such methods may be referred to as "Phase Coherent Imaging" (PCI) beamforming techniques. Amplitude filtering may be applied to phase coherent imaging to, for example, weight features associated with scattering in such imaging to enhance defect contrast or suppress noise, or both.

The invention discloses an interference fringe calibration system and method for Doppler coherent imaging spectrum diagnosis. The system comprises a forward and reverse dual-optical-path Doppler coherent imaging system and an external moving light source. And the forward and reverse dual-optical-path Doppler coherent imaging system performs interference fringe imaging on light of which the wavelength is a target multi-state spectral line in the same light-emitting region in the magnetic confinement plasma device from two opposite directions. The external light source is moved to realize switching between an internal particle light-emitting measurement mode and an external laser measurement mode of the device. The actual central wavelength of the target multi-state spectral line can be calculated by combining the interference fringe image of the target multi-state spectral line of the light-emitting area in the device and the interference fringe image of the external laser, and the phase distribution of the interference fringes when the light-emitting particles in the device do non-directional motion is obtained to realize calibration. According to the invention, the problem of inaccurate particle velocity measurement caused by inconsistency between the central wavelength calculated by the database and the actual central wavelength during interference fringe calibration can be avoided.

The invention discloses a low-coherence imaging quality evaluation method and device and electronic equipment, and relates to the technical field of laser welding monitoring. The method comprises the steps that point cloud data related to a key hole in the laser welding process is obtained, and a peripheral point cloud projection drawing of the key hole is obtained based on the point cloud data; executing a keyhole area fitting process for multiple times to determine a keyhole area based on fitting parameters obtained in each fitting process; wherein in each fitting process, a coordinate system is constructed based on the peripheral point cloud projection drawing, grids are divided according to a preset scale, and fitting parameters of the keyhole area are determined based on grid parameters of each grid; the preset scales in different fitting processes are different; and determining an imaging quality evaluation result based on the point cloud data in the keyhole region and the region area of the keyhole region. Therefore, the accuracy of the key depth information collected in an optical low-coherence imaging mode is evaluated, and preconditions are provided for key depth online monitoring in the laser welding process.