73 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 an optical coherence imaging noise reduction method and device, equipment and a medium, and the method comprises the following steps: obtaining a B-scan image, and constructing a training set; training an image noise reduction model based on the deep neural network by adopting the training set; obtaining a to-be-denoised B-scan image, inputting the to-be-denoised B-scan image into the trained image denoising model for denoising, and outputting a reconstructed B-scan image; wherein the image noise reduction model comprises an encoder and a decoder, and the encoder takes a B-scan image with noise as input to obtain a potential representation of the B-scan image with noise; and the decoder takes the potential representation of the B-scan with noise as input, and outputs a reconstructed B-scan noise reduction image. According to the method, the image noise reduction model is constructed through the deep neural network, the B-scan image is subjected to noise reduction, the clear B-scan image is effectively obtained, and the method has the advantages of being excellent in noise reduction effect and high in speed. The method can be widely applied to the technical field of image imaging noise reduction.

The invention discloses a single-frequency pulse laser source multi-dimensional imaging system and method, and belongs to the technical field of laser radars. The imaging system comprises a single-frequency pulse laser source module, an optical imaging module, a frequency shift and phase modulation module, a time sequence control module and a data processing module, the single-frequency pulse laser source module emits a detection light beam, a first local reference light beam and a second local reference light beam, and the detection light beam irradiates a target to generate a reflection light beam; the time sequence control module controls the three light beams to perform synchronous frequency shift, so that the first local reference light and the reflected light beam are coherent in the optical imaging module to form a holographic image, and the second local reference light beam and the partially reflected light beam generate a beat frequency signal in the frequency shift phase modulation module; the data processing module analyzes the beat frequency signal so as to adjust the initial phase and frequency of outgoing of the detection light beam, and dynamic coherent imaging of the reflected light beam and the first local reference light in the optical imaging module is ensured; and real-time information of the holographic image is analyzed, and a high-quality three-dimensional image is reconstructed.

The present disclosure relates to a surgical robot for orthopedic surgery, comprising a robotic arm device, a positioning and navigation device, and a control device, wherein the robotic arm device comprises at least two robotic arms, and an end effector is arranged at the end of each robotic arm close to an operating zone. The positioning and navigation device comprises an electromagnetic navigation device. The electromagnetic navigation device comprises: a tracking apparatus for electromagnetic tracking, comprising a magnetic field generator used for covering the at least two end effectors and at least two first electromagnetic tracking elements used for respectively tracking the orientations of the at least two end effectors during the surgery; and a reference frame, wherein a second electromagnetic tracking element and a developing body capable of displaying a coordinate position are arranged on the reference frame. The positioning and navigation device further comprises an imaging device used for positioning and navigating the at least two end effectors. The imaging device comprises an infrared coherent imaging navigation device used for positioning the operating zone and the at least two end effectors.

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.

The present invention provides a method, device and equipment for coherent imaging in a well logging remote detection imaging domain, and relates to the technical field of oil and gas exploration and development. The method comprises: obtaining remote detection offset data of well logging; performing offset imaging on the remote detection offset data of well logging to obtain offset imaging results; horizontally stacking the offset imaging results along the offset direction to obtain an initial stacking section; performing bootstrap coherent enhancement in the depth direction on the initial stacking section to obtain preliminary enhanced imaging data corresponding to each position point of the initial stacking section; for each position point corresponding to the preliminary enhanced imaging data, calculating the second high-resolution bootstrap coherence at the position point; the second high-resolution bootstrap coherence is the second high-resolution bootstrap coherence of the offset imaging result in the offset direction; generating a coherent imaging result according to the second high-resolution bootstrap coherence and the preliminary enhanced imaging data. The present invention can improve the imaging accuracy of wellbore fractures in remote detection data of well logging.

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 invention discloses a method for processing a target substance distribution image in a coherent imaging system, and belongs to the technical field of coherent imaging image processing. The method comprises the following steps: configuring a reference laser interference signal subdivision multiple, so that the exposure trigger frequency is more than two times higher than the highest frequency of an observation wave band light interference signal; designing a special narrow-band band-pass FIR (Finite Impulse Response) filter according to the component characteristic absorption wavelength, the reference laser wavelength and the reference laser interference signal subdivision multiple of a target substance to be measured; based on an area array coherent imaging technology, obtaining an interference signal data cube image frame by frame according to an exposure triggering frequency; newly-added frame image data of the data cube is sent to an FIR filter for parallel real-time processing, and a substance distribution two-dimensional normalized image is obtained; and obtaining a two-dimensional concentration distribution image with quantitative concentration based on normalized image background removal processing. According to the method, synchronous calculation in a coherent imaging data cube frame image acquisition process is realized, storage resources are saved, and the material distribution imaging rate is improved.

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.

The invention discloses an adjacent hidden human body target detection method and device based on space-time fusion, and belongs to the technical field of low-frequency radar imaging. The method comprises the following steps: processing target echoes collected by a radar by using non-causal moving target indication, removing static target echoes, and obtaining effective multi-channel echo signals; performing coherent imaging on the effective multi-channel echo signals to obtain multiple frames of images; constructing a preliminary spatial-temporal feature model by using the obtained multiple frames of images; and optimizing the preliminary spatial-temporal characteristic model to obtain spatial-temporal characteristics with a high signal-to-noise ratio. According to the method, the time resolution and the spatial resolution of the radar can be fused, the accuracy of adjacent target detection is greatly improved, and the spatial position and the respiratory frequency of the human body target are obtained simultaneously.

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 present invention is a freely viewable large-scale holographic display system, which includes a hologram control unit, an optical projection system and a diffraction screen; a computer generates a computational hologram and uploads it to the hologram control unit for modulation. The holographic complex amplitude modulated by the hologram control unit is projected onto the surface of the large-scale diffraction screen through the optical projection system, and each spatial position on the diffraction screen modulates the incident holographic complex amplitude wavefront, and the wavefront at each spatial position is diffracted into discrete diffraction lights of multiple directions, thereby expanding the field of view. At the viewing position behind the diffraction screen, these different orders of emitted light are coherently superimposed at any position, and the human eye is similar to a small optical filtering system, filtering out the diffraction orders whose diffraction angles deviate from the pupil position, receiving different orders of diffraction lights at different spatial positions of the large-scale diffraction screen, and forming coherent images on the retina, thereby realizing a large-scale holographic display with a free range.

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.