12 results about "Lateral resolution" patented technology

The present application relates to the field of optical imaging technology, and particularly relates to a full-depth-range high-lateral-resolution OCT imaging method, system and storage medium based on interference synthetic aperture. The OCT imaging method comprises sample positioning: moving the point spread function of the sample to a region close to 0 optical path; collecting three-dimensional original data; pre-processing the collected three-dimensional original data to obtain complex signals containing amplitude and phase information; performing three-dimensional Fourier transform on the scattering potential distribution based on a synthetic aperture algorithm to obtain frequency domain signals, correcting the nonlinearity of the spatial frequency by interpolation or frequency domain filtering before interpolation, and then performing inverse Fourier transform to reconstruct the spatial distribution of the scattering potential and obtain three-dimensional image data. The detail information of the defocus region is recovered, high-resolution imaging in the full depth range is ensured, and the inherent contradiction between lateral resolution and focal depth is broken through.

This invention provides an electrically controlled microsphere-enhanced liquid crystal layer, a differential confocal microscopy imaging method and system. The electrically controlled microsphere-enhanced liquid crystal layer includes an electrically controlled liquid crystal layer and a microsphere array disposed on the electrically controlled liquid crystal layer. The method includes the following steps: converting a single-wavelength parallel beam into circularly polarized light, focusing it through an objective lens and an objective lens driver, and scanning the sample through the electrically controlled microsphere-enhanced liquid crystal layer; applying a voltage to the electrically controlled microsphere-enhanced liquid crystal layer; collecting the reflected or scattered return beam from the sample, splitting it into two probe beam paths, and generating corresponding first and second images; calculating the image quality evaluation value of the two-dimensional lateral image based on this, and using this as a feedback signal to apply a voltage to the electrically controlled microsphere-enhanced liquid crystal layer. This invention introduces an electrically controlled microsphere-enhanced liquid crystal layer into the imaging path of a confocal microscope, achieving a significant enhancement in lateral resolution. By controlling the liquid crystal with an applied voltage, the equivalent refractive index can be dynamically adjusted.

This utility model discloses a photoacoustic probe and a photoacoustic imaging system. The photoacoustic probe includes a tube, a light guide, a signal line, a lens group, a reflective element, and an ultrasonic transducer. The light guide and the signal line pass through the tube along its axial direction. The signal line is electrically connected to the ultrasonic transducer. The lens group, reflective element, and ultrasonic transducer are all disposed within the tube and arranged sequentially along its axial direction. The lens group is located on the light-emitting side of the light guide and includes at least one curved lens. The light guide guides the light beam and directs it to the lens group. The lens group converges the light beam, directing it to the reflective element. The reflective element reflects the converged light beam, allowing it to pass through the tube and exit onto the target area within the imaging region. The ultrasonic transducer converts the ultrasonic waves received from the target area into electrical signals. By converging the light beam through the lens group, the size of the light spot illuminating the target area is reduced, thus improving the lateral resolution.

This invention relates to an isotropic three-dimensional super-resolution imaging method using a single objective lens, comprising the following steps: outputting a linearly polarized excitation beam through a picosecond pulsed laser and an outputting a linearly polarized loss beam through a nanosecond pulsed laser; adjusting the polarization direction and power of the excitation and loss beams using a half-wave plate and a polarizing beam splitter; incident the loss beam onto a spatial light modulator; modulating the light field by loading a preset phase diagram to generate three focal points with different topological charges, axial positions, and energy distributions; and modulating the polarization state of the focal points using a high-order vortex phase delay plate to separate the loss beams with different polarization components. This invention achieves an imaging resolution of less than 100 nm in both the lateral and axial directions, with similar lateral and axial resolution performance. In three-dimensional super-resolution imaging, it can accurately reflect the true three-dimensional structure of an object. The imaging resolution is directly proportional to the intensity of the loss beam; the stronger the loss beam intensity, the higher the three-dimensional imaging resolution.

This application discloses a method, apparatus, device, and storage medium for constructing a velocity model, belonging to the field of seismic exploration technology. The method includes: acquiring seismic data of the exploration area, including first arrival times; constructing a first velocity model based on the seismic data; performing pre-stack depth migration processing on the seismic data based on the first velocity model to obtain a migration stacking profile and migration gathers; determining a reference reflecting surface in the migration stacking profile, and determining the curvature corresponding to common reflection points in the reference reflecting surface based on the migration gathers; determining optimization parameters based on the curvature corresponding to the common reflection points, and optimizing the first velocity model using the optimization parameters and a first near-surface velocity to obtain a second velocity model; and determining the propagation velocity of seismic waves in the subsurface medium layer of the exploration area using the second velocity model and the seismic data. This method can improve the accuracy of the velocity model, the lateral resolution, precision, and accuracy of seismic data imaging.

The application provides a super-structured optical fiber for generating a spindle beam and an optical acoustic endoscopy imaging system, the super-structured optical fiber comprising a fiber body and a super-structured optical structure arranged at an exit section of the fiber body, the super-structured optical structure comprising an optical expander and a super-structured structure array arranged at the end of the optical expander; the super-structured structure array is periodically arranged by super-structured units in a sub-wavelength scale, and the super-structured unit is in the form of a regular quadrangular prism; by clear phase modulation and parameter optimization, the super-structured optical structure is integrated at the end face of the fiber body, the emission light wave front is accurately regulated, a long focal depth spindle beam is obtained under the condition of a limited aperture and a compact structure, and the problem that the focal depth is limited in optical acoustic endoscopy imaging is effectively relieved; based on the combination of Bessel beams and the lateral spot size, the application maintains a high lateral resolution ability while extending the focal depth, avoids the defect that the resolution is significantly reduced in the traditional zooming scheme, and improves the imaging consistency and the signal-to-noise ratio.

The application discloses an up-conversion structured light illumination three-dimensional super-resolution imaging system and method, and belongs to the field of microscopic imaging. Light emitted by a laser light source is transmitted into a Fourier lens group to become diffraction light spots of various orders after phase control by a reflective spatial light modulator, and light of diffraction orders of +1 and +2 is filtered out by a light filtering pinhole. The light of diffraction orders of +1 and +2 is irradiated to a sample on an objective table by a microscope objective, and the sample generates a fluorescence band after being excited. The fluorescence is focused to the target surface of a first camera to form an image after being focused by a focusing assembly after passing through the microscope objective. A second super-lens modulator performs axial zoom layer scanning on the fluorescence, and a second camera performs focal plane imaging to lock the best focal plane to adjust the focal length of the first camera. The focal plane searching is more stable, and the introduced interference factors are less. Three-dimensional structured illumination light is formed by interference of the diffraction light of +1 and +2 orders, and three-dimensional super-resolution imaging with a lateral resolution of 100 nm and an axial resolution of 300 nm is realized.

This invention relates to the field of reservoir prediction technology, and particularly to a method and apparatus for establishing a low-frequency model based on Hilbert-Huang transform for seismic inversion. The method includes: partially stacking CRP gathers that reflect AVO characteristics from CRP gather data; decomposing the partially stacked data volume into several intrinsic mode function (IMF) data volumes; performing a Hilbert-Huang transform on the IMF data volumes to obtain a Hilbert spectrum; performing low-frequency energy enhancement on the partially stacked data volumes based on the Hilbert spectrum to obtain a low-frequency enhanced data volume; and establishing a low-frequency model using a support vector machine method combined with well-seismic analysis, under the constraints of a subdivided layer interpretation structural framework. This invention expands the effective signal at the low-frequency end without changing the relative relationships between the partially stacked data volumes, improving the vertical resolution of seismic data while maintaining its lateral resolution, thus providing effective technical support for unconventional reservoir oil and gas exploration and development.

This invention discloses a label-free, in-situ detection device and method for single-cell membranes, belonging to the field of mass spectrometry imaging technology. The device sequentially comprises a VUV laser generator, a spectrometer, an ionization chamber, a Time-of-Flight (TOF) mass analyzer, and a data acquisition processor. The spectrometer includes a spectroscopic system. This invention utilizes a lens focusing method, adjusting the distance between plano-convex mirrors in the spectroscopic system to split and focus the VUV laser, resulting in a minimal focused spot. The optimal lateral and longitudinal resolution (12 nm) of the device was determined by characterizing the spot size. Using this device to detect HeLa cell membranes, it was confirmed that it can accurately peel off real cell membranes, effectively improving the device's resolution, especially the longitudinal resolution, providing more accurate reference information for fields such as cancer research, cell communication, drug screening, and disease diagnosis.

The application discloses a SPAD array macro-pixel readout circuit of a correlation detection technology combined with a parent-child TDC, which comprises an AQC, a time window generation circuit, a self-recovery circuit, a child TDC, a parent TDC, a correlation detection circuit and a parallel-to-serial conversion circuit. Each macro-pixel readout circuit is connected with 2*2 SPADs, each SPAD is connected with one AQC, the AQC outputs a high level after quenching a SPAD triggered by a photon, the high level generates a pulse with a fixed pulse width through the time window generation circuit, the pulse triggers the child TDC and starts the correlation detection to determine whether the photon information is retained, if yes, the parent TDC is started, otherwise, the child TDC is reset and the self-recovery circuit is started to reset the SPAD. The child TDC in the macro-pixel readout circuit measures the differential mode of TOF of the photons detected by different SPADs, and the parent TDC measures the common mode of TOF, so that the reduction of the lateral resolution caused by the traditional correlation detection is compensated under the condition that the power consumption and the area are limited.

This invention provides a method to improve the accuracy and efficiency of micro- and nanostructure measurements by resolving the registration accuracy problem between cross-scale data with large differences in lateral resolution (e.g., atomic force microscopy (AFM) and white light interferometry (WLI)). [Solution] The method involves preprocessing the AFM dataset and WLI dataset to identify the reference surface in the measurement data and calibrate the errors of different data sources S1, extracting feature region descriptors using an iterative similarity region algorithm S2, registering the two datasets based on the extracted feature region descriptors using an attention-based registration mechanism S3, fusing the WLI data and AFM data based on the registration results and registering the height reference, then replacing the AFM measurement data with the WLI measurement data in the overlapping portion, and performing smoothing processing by linear interpolation at the edge portions to complete the data fusing S4.

This invention discloses a method, system, device, and storage medium for joint inversion of P-wave impedance and porosity. The method includes: constructing a hybrid network; establishing a forward modeling framework; establishing a composite loss function; introducing the forward modeling framework and the composite loss function into the training of the hybrid network, and training the inversion to obtain the final P-wave impedance and porosity. Introducing a seismic data error loss term into the objective function can enhance the consistency between the predicted results and the actual earthquake waveform; adding a physical constraint loss term for P-wave impedance-porosity can constrain the intrinsic correlation between the inversion results of P-wave impedance and porosity, thereby improving the accuracy of the joint inversion and enhancing the lateral resolution of the profile. Through comparison of different network modules, introducing a BiLSTM module into the ResUNet network module can improve the inter-layer transition stability and inversion accuracy; further adding inter-channel attention to the Transformer network effectively suppresses the "striped" phenomenon of the joint inversion results and enhances the lateral resolution.