27 results about "Coherent imaging" patented technology

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.

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.

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 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 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 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.

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.

To provide an optical coherent imager comprising a shared path for transmitting and receiving an optical signal by utilizing polarization diversity, an optical coherent imager including an array of optical coherent sensing units, and a method for sensing coherent.SOLUTION: In a coherent sensing unit 100, regarding a polarization varied free space-to-waveguide coupler 101 which functions as both a transmitter and a receiver, in a case where a polarization state of an input optical signal Ein arriving at the coupler is orthogonal with a polarization state of an output optical signal Eout outputted from the coupler, the input optical signal is internally coupled to an input coupling waveguide 122 which is different from an output coupling waveguide 121. As the transmitter, the output optical signal Eout that is outputted is propagated in a direction outside of an x-y plane (namely, a propagation direction of Eout has a z component other than zero), and polarized together with polarization that is determined by a design of the coupler, and as the receiver, the input optical signal Ein is coupled to the coherent sensing unit.SELECTED DRAWING: Figure 1A

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 an intermediate infrared star light interference fringe generation and aberration suppression evaluation system and method based on 4F system spatial filtering. The system is applied to coherent interference measurement of mid-infrared band fixed star light in astronomical observation. The system comprises a telescope collimation unit, an aberration equivalent unit, a 4F relay light path unit, an adjustable pinhole spatial filtering unit arranged on a 4F middle focal plane, a reference light generation and phase tilt modulation unit and a coherent superposition and interferogram output unit. By arranging the pinhole, the wavefront high-spatial-frequency component of the test arm is cut, so that the influence of atmospheric turbulence or high-order aberration on interference fringes is reduced, and the regularity of the fringes is improved. The system further provides a parameterization strategy for setting the pinhole size with the Airy spot radius as a scale, and interference fringes under different pinhole multiplying power can be subjected to comparative analysis and wavefront diagram PV value calculation. The method is suitable for the scenes of intermediate infrared coherent imaging, wavefront shaping, spatial filtering teaching demonstration and the like.

The invention provides an enhanced quantum-induced coherent imaging system and method, and belongs to the technical field of quantum optics and photoelectric imaging, and the system comprises a seed light injection type bidirectional pumping quantum light source module which is used for generating a signal light beam and an idler frequency light beam with high coherence; the seed light injection type bidirectional pumping quantum light source module comprises a pumping light source, a seed light source, a nonlinear medium, a beam splitting unit, a beam combining unit and a reflecting unit. Seed light emitted by the seed light source and pump light emitted by the pump light source are combined at the beam combining unit and jointly enter the nonlinear medium to induce to generate a stimulated parametric down-conversion process, and a signal light beam and an idler frequency light beam are output. And the beam splitting unit is arranged at the downstream of the light path and is used for separating the signal light beam from the idler frequency light beam. According to the method, the inherent advantages that ZWM quantum imaging is high in environmental noise resistance, does not need to conform to measurement and the like are reserved, and the contrast ratio of interference fringes is greatly improved; and the bottleneck of short coherence length in the traditional scheme is effectively solved.

An all-optical hologram reconstruction system and method is disclosed that can instantly retrieve the image of an unknown object from its in-line hologram and eliminate twin-image artifacts without using a digital processor or a computer. Multiple transmissive diffractive layers are trained using deep learning so that the diffracted light from an arbitrary input hologram is processed all-optically to reconstruct the image of an unknown object at the speed of light propagation and without the need for any external power. This passive diffractive optical network, which successfully generalizes to reconstruct in-line holograms of unknown, new objects and exhibits improved diffraction efficiency as well as extended depth-of-field at the hologram recording distance. The system and method can find numerous applications in coherent imaging and holographic display-related applications owing to its major advantages in terms of image reconstruction speed and computer-free operation.

The invention provides a non-invasive optical scanning system and method using full field optical coherence tomography (FF-OCT) to acquire data sets related to scattering properties of a targeted three dimensional region of skin or eye tissue. The system uses image sensor arrays to acquire, in a sufficiently short period of time to avoid fringe washout, at least two data sets that have an interferometric phase relationship. Because acquisition time for the data sets is less than one millisecond and independent of the frame rate of the image sensor arrays, low cost image sensors satisfy cost requirements for consumer monitors, such as sub-dermal fingerprint imager for enhanced bio security. In some embodiments, such as home retinal scanning for monitoring macular degeneration, an artificial intelligence (Al) agent can be used to assist in system alignment and use.

The invention discloses a broadband monopulse optical nonlinear refractive index spectral measurement device based on a 4f phase coherent imaging system, and belongs to the field of nonlinear photonics materials and nonlinear optical information processing. The invention provides a broadband monopulse optical nonlinear refractive index spectral measurement device based on a 4f phase coherent imaging system on the basis of the 4f phase coherent imaging system. According to the device, phase initial adjustment is carried out on incident super-continuous white light through an adjustable phase object, phase shift introduced by nonlinear refraction at a focus is superposed, and internal light and shade contrast is formed after interference at an image plane. The nonlinear refractive index spectrum in the white light range is extracted by recording the intensity change of the spectrum in the phase object. The device can be seamlessly integrated with the existing transient absorption spectrum technology.

The invention relates to a light source optimization method and system under a partial coherence imaging calculation model, belongs to the technical field of calculation photoetching, and solves the problem that an EUV photoetching SO algorithm considering light source coherence is lacked in the prior art. The method comprises the following specific steps: respectively calculating an electric field generated by each light source point in an effective light source through coherent imaging in combination with a mask three-dimensional effect; on the basis that the electric field generated by each light source point is superposed with the electric fields generated by all the coherent light source points, the total light intensity generated by each light source point is calculated in combination with the light source intensity and light source coherence degree conditions of the light source points; accumulating the total light intensity generated by all the light source points to obtain the light intensity of the output image under the condition of the coherence degree, and calculating the developed output image; the developed output image is utilized to optimize the light source based on a gradient optimization algorithm to obtain an optimized light source, so that a high-resolution photoetching imaging result is realized, and the blank of an EUV photoetching SO algorithm of light source coherence is solved.

The invention discloses an SOP chip pin upwarp defect detection method and system based on optical tomography and a Yov5 model, and the method comprises the steps: scanning a chip pin through employing a tomography technology, obtaining an interference signal, carrying out the image reconstruction of the collected interference signal, and making a data set; the data set is input into a pre-constructed Yolov5 model for training, and an SOP chip pin defect detection model based on the Yolov5 model is obtained; and inputting the sample into the SOP chip pin upwarp defect detection model based on the Yolov5 model to obtain a detection result of the sample pin, so that the SOP chip pin upwarp defect detection efficiency and accuracy are improved.

To provide systems, methods and apparatuses for monitoring material processing using imaging signal density calculated for an imaging beam directed to a workpiece or processing region, e.g., during inline coherent imaging (ICI).SOLUTION: The imaging signal density may be used, e.g., to monitor laser and electron beam welding processes such as full or partial penetration welding. For example, the imaging signal density is indicative of weld penetration as a result of reflections from a keyhole floor and / or from a subsurface structure beneath the keyhole. The monitoring may include, e.g., automated pass / fail or quality assessment of the welding or material processing or parts produced thereby. The imaging signal density may also be used to control the welding or material processing, e.g., using imaging signal density data as feedback. The imaging signal density may be used alone or together with other measurements or metrics, such as distance or depth measurements.SELECTED DRAWING: Figure 1

Systems and methods for static and dynamic calibration could be used to align a measurement beam from a coherence imaging (CI) measurement system with a processing beam from a material processing system. These systems and methods could generate a calibration measurement output from the CI measurement system and / or an auxiliary sensor. Subsequent measurements performed by the CI measurement system could be modified based, at least in part, on this calibration measurement output.

The invention discloses a PSOCT system based on feedback adjustment circular polarization and an imaging method, and belongs to the field of polarization sensitive optical coherence imaging. A Stokes vector is calculated in real time by analyzing a backscattered light signal on the surface of a sample tissue collected by the system, and the Stokes vector is compared with a target circular polarization state position on a Poincare sphere. And then, the feedback control module dynamically adjusts a fourth polarization controller according to a deviation signal generated by comparison, so that the polarization state change caused by bending or shaking of the sample arm optical fiber is compensated, and the detection light irradiated to the surface of the sample tissue is always kept in a stable circular polarization state. Under the conditions that additional polarization measurement hardware is not added and the system structure is not changed, the problem that the polarization state of a single-state input PSOCT system is unstable is effectively solved, the accuracy and repeatability of birefringence imaging are remarkably improved, and clinical transformation and application are better facilitated.

To provide a device and a method for improving the accuracy of an alignment procedure, improving the precision of the alignment procedure, reducing the time requirement of the alignment procedure, automating the alignment procedure (partially or completely), or reducing the requirement of minimum knowledge and experience for executing the alignment procedure.SOLUTION: Systems and methods for static and dynamic calibration can be used to provide alignment of a measurement beam from a coherence imaging (CI) measurement system to a processing beam from a material processing system. In these systems and methods, a calibration measurement output can be obtained from a CI measurement system and / or an auxiliary sensor. Further measurements performed by the CI measurement system may be modified based at least in part on the calibration measurement output.SELECTED DRAWING: Figure 1

This invention relates to the field of laser processing technology, specifically to a laser processing calibration device and method based on coherent imaging. The device includes a fixed module, which is fixedly connected to a reference arm module and a sample arm module. The sample arm module is fixedly connected to a laser processing equipment, which contains a galvanometer and a field lens. The fixed module includes a fixed box, inside which a beam splitter is installed. The connecting optical fibers between the fixed module, the reference arm module, and the sample arm module are all fixedly installed in the fixed box. This application, through an original rigid integrated structural design, solidifies the vibration-sensitive interferometer core optical fiber and optical components into a single unit, significantly suppressing vibration-induced optical path noise from a physical source. This effectively solves the core problems of imaging blurring, large processing errors, and low system reliability caused by fiber vibration in existing technologies, significantly improving the accuracy, repeatability, and long-term stability of laser processing.

A diffractive optical network-based multispectral imaging system is trained using deep learning to create a virtual spectral filter array at the output image field-of-view. The diffractive multispectral imager performs spatially-coherent imaging over a large spectrum, and at the same time, routes a pre-determined set of spectral channels onto an array of pixels at the output plane, converting a monochrome focal plane array or image sensor into a multispectral imaging device without any spectral filters or image recovery algorithms. Furthermore, the spectral responsivity of this diffractive multispectral imager is not sensitive to input polarization states. Due to its compact form factor and computation-free, power-efficient and polarization-insensitive forward operation, the diffractive multispectral imager can be transformative for various imaging and sensing applications and be used at different parts of the electromagnetic spectrum where high-density and wide-area multispectral pixel arrays are not widely available.