9results about How to "Guaranteed imaging accuracy" patented technology

The invention relates to a micro sample self-centering clamping device for a synchrotron radiation in-situ test. Comprising a sensor transition connector, a first back tightening nut, an upper loading connecting rod, an upper in-situ clamping block, an upper clamp, a lower clamp, a lower in-situ clamping block, an auxiliary positioning tool, a lower loading connecting rod, an aligning connecting rod, a second back tightening nut, a spherical centering upper cushion block, a spherical centering lower cushion block and an aligning nut. According to the invention, stable clamping and high-precision self-centering of a small sample in a synchrotron radiation in-situ test are met, and the requirement that the small sample is combined with synchrotron radiation light source tomography to carry out a low-cycle fatigue in-situ test at a service temperature is met.

This invention discloses a dual-spectrum hierarchical architecture and CT detector based on X-rays, relating to the field of medical CT equipment technology. It includes: a scintillator layer capable of receiving high-energy X-rays and low-energy X-rays respectively; and several sets of metal sheets positioned on one end face of the scintillator layer, wherein the metal sheets can block high-energy or low-energy X-rays irradiating a portion of the scintillator layer. This invention solves the technical problems of complex structure, low yield, and high cost of existing dual-spectrum CT detectors.

The application discloses a kind of based on two-dimensional weighted back projection and linear base function interpolation trunk three-dimensional imaging method, comprising: selecting several different measurement heights of to-be-imaged trees, using stress wave measuring equipment respectively at different heights to carry out stress wave data acquisition;Using two-dimensional weighted back projection algorithm reconstructs the stress wave velocity field of each layer, obtains the control point set needed for linear base function interpolation;All known control point set is mapped to three-dimensional coordinate system, and with the wave speed v corresponding to each point constitutes three-dimensional feature point cloud;Linear base function interpolation of using linear kernel is used to carry out interpolation reconstruction, and function F ( x , y , z ) are fitted;According to fitting function F ( x , y , z ) all point sets located in three-dimensional fault imaging region are calculated;Using the display method of point cloud, the points inside imaging region are visualized and displayed.The application significantly improves three-dimensional imaging speed and defect recognition accuracy in actual scene, and is suitable for nondestructive testing and evaluation of three-dimensional defects inside trunk.

The application discloses a high-resolution acoustic imaging method based on adaptive subspace weighting, which comprises the following steps: reading a multi-channel time-domain acoustic signal collected by a microphone array; generating a dynamic adaptive window function based on the spectral characteristics of a current signal frame to suppress spectral leakage; performing windowing processing on the signal by using the dynamic adaptive window function and performing Fourier transform to generate frequency-domain snapshot data; constructing a covariance matrix for each analysis frequency bin and then averaging to obtain a final covariance matrix of a sound source signal; performing diagonal loading processing on the covariance matrix by using an adaptive two-domain regularization method; performing eigenvalue decomposition on the covariance matrix and dividing the covariance matrix into a signal subspace and a noise subspace; establishing a fine scanning grid; precalculating the steering vectors of all grid points and storing the steering vectors as an array manifold matrix; and performing weighted fusion on a fine spatial response map and a coarse spatial response map by using a multi-scale spatial response fusion strategy to generate a final acoustic imaging map.

The invention discloses a microcirculation imaging device and method. The microcirculation imaging device comprises a polarizer, a polarization analyzer, a linkage mechanism, a light source mechanism, a spectroscope, a light guide pipe and an imaging system. Wherein the linkage mechanism comprises a first linkage piece and a second linkage piece, the first linkage piece drives the polarizer to rotate, the second linkage piece drives the polarization analyzer to rotate, and the first linkage piece and the second linkage piece are in transmission connection and keep the polarizer and the polarization analyzer to rotate at the same angle; a light-transmitting hole is formed in the center of the spectroscope; a through hole is formed in the center of the light guide pipe, and an inclined reflective mirror is arranged in the light guide pipe to focus a light path. The polarizer and the analyzer are linked through the linkage mechanism, so that the relative angles of the polarizer and the analyzer are kept consistent, even if the polarizer rotates, the analyzer can be matched with the polarizer to filter polarized light in the corresponding polarization direction, and the imaging precision is guaranteed.

The invention provides an underground cable three-dimensional imaging method based on terahertz data and X-ray data, and the method comprises the steps: solving dielectric constant distribution and material density distribution according to the terahertz data and the X-ray data, building the incidence relation between the dielectric constant distribution and the material density distribution, and determining projection reconstruction initial parameters; a fitness function is constructed according to the projection data and the projection reconstruction initial parameters, dielectric constant distribution and material density distribution are reconstructed through a quantum genetic optimization algorithm based on the fitness function and the incidence relation, and an initial reconstruction result is obtained; performing cross iterative optimization on the dielectric constant distribution and the material density distribution by using a regularization item constructed by an initial reconstruction result until convergence; and based on the converged dielectric constant distribution and material density distribution, after an X-ray reconstruction image and a terahertz reconstruction image are generated, data fusion and feature optimization are carried out, and a three-dimensional image of the underground cable is obtained. Therefore, a high-precision three-dimensional image of the underground cable is generated by fusing the optimized bimodal image data.

The utility model relates to a zoom lens, relates to the technical field of optical instruments, and aims to solve the technical problems of repeated friction between the outer wall of a zoom lens cone and the inner wall of a linear sleeve, complex structure and difficulty in maintenance in the prior art. The zoom lens comprises a driving unit, a lens group unit, a position adjusting unit and a sliding assembly, the driving unit is connected with the position adjusting unit, and the position adjusting unit and the sliding assembly are connected with the lens group unit. The driving unit drives the lens group unit to move along the sliding assembly through the position adjusting unit; the lens group unit comprises a zoom lens cone group, a compensation lens cone group and a lens cone support. The zoom lens cone group and the compensation lens cone group are connected with the lens cone support. The device can reduce friction, and is simple in structure, easy and convenient to operate and easy to use and maintain.

The utility model discloses fluorescence imaging equipment capable of rapidly processing tissue slices, and aims to provide the fluorescence imaging equipment capable of rapidly processing the tissue slices, which is convenient for batch imaging, improves the detection efficiency, improves the functionality and improves the imaging efficiency. A visible light laser, a visible light camera, a near-infrared laser and a near-infrared camera are installed on the top in the operation box, a rotating assembly is movably connected to the bottom in the operation box, the rotating assembly is provided with a rotating shaft, one end of the rotating shaft is rotationally connected with the rotating assembly, and the other end of the rotating shaft is connected with a rotating disc which is provided with a slice containing groove. The multiple slice containing grooves are arranged around the circle center of the rotary disc, the rotary disc is connected with a locking assembly, and the locking assembly is movably connected with the slice containing grooves. The beneficial effects of the utility model are that the device has the multifunctionality of visible light and near infrared dual-channel imaging; slice samples can be imaged in batches, so that the detection efficiency is improved; and the use convenience and the operation efficiency of the equipment are improved.

The invention belongs to the technical field of wireless imaging, and discloses an imaging system and method of a double-RIS auxiliary radio complementary mode, and the system comprises a transmitter Tx, a first receiver Rx1, a second receiver Rx2, a forward RIS, a backward RIS, and a deep learning network. The forward RIS performs beam regulation and control on a signal transmitted by the Tx; one part of the wave beam which passes through the target sensing area SoI and is regulated and controlled is reflected by a target to form a reflection signal and is received by the Rx1, and the other part of the wave beam passes through the SoI and is used as a transmission signal to be received by the backward RIS and focused on the Rx2 after being subjected to wave beam regulation and control; and the deep learning network is used for carrying out feature extraction on the reflection signal and the transmission signal, correspondingly obtaining features for representing a reflection coefficient and a transmission coefficient, and carrying out feature fusion to generate a contour map of the target. Wherein the forward and backward RIS calls a beamforming control mode which is configured in advance when acquiring electromagnetic data, and sequentially scans and senses the space. The method can improve the quality of the reconstructed image.