59 results about "Phase reconstruction" patented technology

The invention provides a synchronous hue shift conversion method, a method and a system thereof for measuring three-dimensional appearance. In the invention, a colored fringe image of an object is obtained by using a colored structured light, one hue information of the colored fringe image is obtained from a hue saturation intensity (HSI) model of the colored fringe image, and finally, the hue information is converted into one hue phase change information. The hue phase change information is used to reconstruct the three-dimensional appearance of the object by hue phase reconstruction. Since the colored structured light comprises multiple colored lights having phase difference in the spatial domain, the phase shift or phase reconstruction can be performed if a single colored image contains phase encapsulation information after multi-step phase shifts. Therefore, the processes of traditional phase encapsulation and Euler conversion are omitted, and the efficiencies for the surface reconstruction and the system measurement on the object are improved.

The invention discloses a frequency and DOA joint measurement method and device based on the Chinese remainder theorem. The method comprises the following steps: arranging a non-uniform linear array comprising L antenna array elements, A/D converters on the antenna array elements each carrying out parallel undersampling to obtain L-path sample sequences; carrying out N-point DFT on the L-path sample sequences and carrying frequency and phase correction on the DFT results through an estimator to obtain L pairs of frequency estimation values and phase estimation values after correction; and carrying out frequency and phase reconstruction through the L pairs of frequency estimation values and phase estimation values and the closed-type Chinese remainder theorem to obtain signal frequency and direction of arrival (DOA) estimation values. The multi-path low-rate undersampling scheme is adopted to realize measurement of high-frequency signals; in the method, the limitation is broken through, and a flexible sparse array layout plan is designed; array parameters are reasonably set with practical engineering requirements being combined; and with the method, DOA parameters can be reconstructed accurately.

The invention relates to a parallel realization method for high-resolution reconstruction of a spot diagram in an astronomic image by a K-T algorithm, and belongs to the field of astronomic technical image processing and computing. The method comprises the steps of firstly reading image and parameter files through a main process of a CPU and calculating related physical parameters for performing image preprocessing and data alignment; secondly segmenting a whole view field image of all frames into numerous sub-blocks according to the size of an isoplanatic region to perform image block segmentation; thirdly distributing sub-block frames to independent sub-processes, performing parallel computing processing by adopting a CUDA parallel programming model, and performing Fourier amplitude and phase reconstruction; and finally performing inverse Fourier transform on each sub-block in combination with Fourier amplitude and phase by each sub-process to obtain a reconstructed image, and performing splicing processing on all the sub-blocks by the main process to finish reconstruction. According to the method, a CPU+GPU mixed heterogeneous parallel mode and a GPU-aware MPI mechanism are applied to the problem in the high-resolution reconstruction of the spot diagram in the astronomic image, so that the problem in the high-resolution reconstruction of the spot diagram is solved; and the method has relatively high expansibility.

The invention relates to a method for treatment and resource utilization of alkali metal slag extracted through lepidolite solid fluorine reconstruction. The extracted alkali metal slag comprises slag components acquired after extracting one or more compounds of Li, K, Rb and Cs metal elements under the condition that F in lepidolite ores is converted into CaF2 for lepidolite ore-phase reconstruction. The method includes the steps of primary acidolysis of solid fluorine reconstruction slag, calcium chloride neutralization, separation, recycling and secondary acidolysis, and aluminum sulfate recycling. The alkali metal slag extracted through lepidolite solid fluorine reconstruction comprises most calcium silicoaluminate, fluorite, a small amount of sodium silicoaluminate and the like, a reconstruction agent is recycled through primary diluted acid leaching, by-products like aluminum salt are extracted through secondary diluted acid leaching, the calcium content in the slag is reduced, the plasticity of tailings is improved, the slag is directly used for raw materials of glass ceramics, ceramics, environment-friendly cement, building blocks and the like, the economic value of the slag is improved, and the comprehensive use efficiency of lepidolite is increased.

The invention provides a design method of a free-adjustable central symmetric vortex beam mask. The complex transmittance function t of the central symmetric vortex beam mask is obtained by combininga central symmetric spiral phase factor, a cone lens transmittance function and a blazed grating; and the complex transmittance function t is loaded into a spatial light modulator by a computer so asto obtain the free-adjustable central symmetric vortex beam mask. The designed mask can generate the central symmetric vortex beam with adjustable optical lobe size and optical ring radius in the farfield of the mask; The size of optical lobes on the left and right sides of the ring is controlled by the phase reconstruction factor (PRF), and the radius of the optical ring is controlled by the cone angle of a cone lens, and the method has quite important application prospect in the field of particle manipulation.

A fast conjugate phase reconstruction method for MRI is based on a polynomial expansion of the off-resonance phase accrual term. The expansion is truncated and can be a Taylor or Chebyshev expansion.

The invention discloses a method for building a fractal dimension-based multi-phase mixed effect prediction model, which comprises the following steps of: (1) acquiring a multi-phase stirring mixing real-time pattern by using electron tomography or a high-rate camera; (2) computing the fractal dimension of the acquired real-time pattern by using a compiled box dimension computation program; (3) acquiring previous relative data of each period at every interval by using the method in step (2) to obtain a corresponding time sequence; (4) computing a time delay variable, an embedded dimension and a bandwidth by using the time sequence obtained in step (3) and by using a phase reconstruction method; (5) processing the time sequence in the step (3) by using a one-step-forward method and kernel regression prediction to obtain an entire time sequence; and (6) testing and verifying a prediction error by using an experimental method. The invention provides a reliable and practical prediction method for predicting the mixed effect of chemical engineering experiments and theoretically instructing stirring reactor design, stirring operation and correction experiments.

The invention discloses a high speed adaptive optical ring spot correction system and method based on machine learning. According to the system and the method, a learning model is established, a mapping relationship between distorted ring spot forms and phase reconstruction coefficients required for correcting deformation is established, a to-be-tested distorted ring spot is input into a trained model, the phase reconstruction coefficient for correcting the distortion can be solved, and further correction phase reconstructed by the phase reconstruction coefficient is loaded to a spatial lightmodulator, so the distortion can be corrected. According to the system and the method, rapid correction can be carried out on ring spot aberration in a stimulated emission depletion (STED) fluorescence microscopy, precision is high, the system is simple and is easy to operate, and the resolution reduction problem resulting from the aberration and scattering generated when sample deep layer imagingis carried out in an STED super-resolution microscopy imaging technology is solved.

The invention relates to a novel artistic technique of producing rolling and forming manganese metal. The invention aims at producing a high-purity metal manganese ball group after being forged and rolled and vacuum hardening burning treatment. The invention is characterized in that the manganese ball group has the regular shape, fixing size and each individual of the ball group individual is completely identical. The invention employs the technique of secondary recrystallization and high-heat pressure forging and rolling, and firstly employs high-strength roll-type forging and rolling apparatus, the powder of the manganese metal is pressed and formed instantly, and also uses the instant high temperature produced by compression to generate the first crystal phase transformation which has fixed physical shape, secondly, the shaped forging and rolling manganese is positioned inside a vacuum smelting-furnace to proceed vacuum hardening burning in certain vacuum condition and at designated temperature in order to generate the second crystal phase reconstruction and transformation, thereby further improving physical property of the machinery.

The invention discloses an artificial lightweight material and a preparation method and application thereof. The artificial lightweight material is made from, by weight, 67-100 parts of a mineral material, 0-8 parts of a foaming agent, 0-20 parts of a mineral aid, and 0-5 parts of additives. The artificial lightweight material is prepared by converting an orthosilicate mineral from various steadystructures to a single nonsteady structure by means of high-temperature phase reconstruction of silicate minerals under the action of high temperature through the synergy of a mineral aid and additives. The artificial lightweight material is suitable for, but not limited to, insulation materials, decorating materials, insulation decorating materials and concrete light aggregates. The artificial lightweight material has light weight, high strength and good properties and is widely applicable; the materials are rich and environmentally friendly; the preparation method of the artificial lightweight material is simple and feasible and has low cost.

The invention discloses a method for establishing a time sequence model for predicting multi-phase mixing uniformity, and is mainly applicable to predicting fluid mixing effect and theoretically guiding and correcting experiment design in a chemical engineering experiment. The method particularly comprises the following steps of: (1) acquiring a multi-phase real-time stirring and mixing pattern by using electron tomography or a high-speed camera; (2) calculating the zeroth-dimension betti number of the acquired real-time pattern by using a written program; (3) acquiring related data at the beginning every certain time by using the method of the step (2) so as to obtain a corresponding time sequence; (4) calculating time delay variable, embedded dimension and bandwidth by a phase reconstruction method by using the time sequence obtained in the step (3); (5) linearly predicting the time sequence in the step (3) by using a one-step forward method and local weighting so as to obtain the complete time sequence; and (6) verifying prediction error by using an experimental method. The model is applied to the prediction of the mixing effect of all fluid; and the method has the advantages of simplicity, convenience and extremely high practical value.

The invention discloses a method for recycling zinc from zinc ferrite resources utilizing an ore phase reconstruction method and belongs to the technical field of mineral processing. The method comprises the following steps that (1), crushing treatment is performed on raw ore, and the zinc ferrite resources with predetermined fineness are obtained; (2), a calcification agent is added to the zinc ferrite resources, pelletizing is performed after sufficient mixing, mixed materials are subjected to calcification roasting in an oxidizing atmosphere to make the zinc ferrite perform ore phase reconstruction to be converted into zinc oxide and dicalcium ferrite, and calcification roasting products are obtained; (3), the calcification roasting products are subjected to reduction roasting to make the dicalcium ferrite in the calcification roasting products be reduced and converted into magnetite, and reduction roasting products are obtained; (4), crushing treatment is performed on the reductionroasting products, and zinc oxide ore and the magnetite are obtained by magnetic separation. According to the method for recycling zinc from the zinc ferrite resources utilizing the ore phase reconstruction method, by means of calcification roasting, the zinc ferrite resources are made to perform ore phase reconstruction to be converted into zinc oxide, subsequent separation of zinc and iron is facilitated, the adopted calcification agent is cheap and easy to obtain, the reaction rate is fast, and the recovery rate of zinc after magnetic separation is high.

The invention relates to a wavefront detection and reconstruction method based on a differential sensor. The method is characterized by comprising the following steps of: imaging a wavefront to be tested on a CCD (Charge Coupled Device) through combining a lens L1 and a lens grid; arranging a CCD camera near a focal plane to record diffraction images of +1 order and -1 order of distortion wavefront; then, simultaneously collecting the two-dimensional light intensity distribution information of the two diffraction images in the two former steps into a computer by an image acquisition card; carrying out mode decomposition and processing to a signal difference Dr by the computer through using a phase reconstruction algorithm; and finally acquiring the restored wavefront to be tested. Without calibration beforehand, the realizing process is simple, the practicability is higher, the added errors are reduced, no sub-caliber light splitting is carried out, and the light energy utilization is improved. The method with less calculation quantity and high calculation speed can be applied to the application fields with higher real-time property requirement, such as adaptive optics, and the like and has stronger anti-noise capability.

The invention relates to a phase unwrapping method based on a shearing principle, which comprises the steps of: 1, firstly, carrying out light field shearing interference in a computer; 2, reducing the occurrence frequency of under sampling with a shear algorithm, i.e. dividing two-dimensional holographic representation light compounding field by the shear light filed thereof to obtain a new light field and calculating the phase of the new light field to obtain the gradient of the phase along the transverse or horizontal direction of the two-dimensional holographic representation light compounding field; and 3, calculating the phase of the two-dimensional holographic representation light compounding field by using the gradient of the phase along the transverse or horizontal direction of the two-dimensional holographic representation light compounding field. In the invention, a shearing interference principle is introduced into the reconstruction of the phase of a digital holographic representation light field, manual translation is carried out on the digital holographic representation light field in the computer to realize transverse and horizontal shearing interference to obtain nearly unwrapped shearing phase distribution, and a corresponding phase reconstruction algorithm is established. The phase reconstruction result obtained by using the method is better than that obtained by using the traditional method.

The invention discloses a detection method of residual cladding thickness of a side-polished fiber. The method is characterized in that the method comprises the following step that: (1), a March-Zehnder transmission type off-axis holographic imaging system is used for shooting an off-axis hologram containing side-polished fiber structure information; (2), phase reconstruction is carried out on the off-axis hologram; (3), unwrapping is carried out on a phase after reconstruction to obtain a phase diagram; (4), the side-polished fiber is removed based on the step (1) and a background hologram is shot, and phase reconstruction and unwrapping are carried out according to the step (2) and the step (3), thereby obtaining a background phase diagram; (5), compensation is carried out on the phase diagram obtained at the step (3) by using the background phase diagram obtained at the step (4) to eliminate phase inclination, thereby obtaining a phase diagram of the side-polished fiber; and (6), structure information is extracted from the phase diagram of the side-polished fiber to obtain a distance between a polishing surface and a fiber core, thereby obtaining a residual cladding thickness. According to the invention, with the method, on-line and nondestructive measurement can be realized; and the distance between the fiber core and the polishing surface can be directly measured.

The invention provides a phase imaging device based on dark stripe logic judgment; the phase imaging device includes a light source device, a beam expanding and collimating element, a spatial light modulator, a lens element, an array detector and an image generating device; the image generating device builds a reference library matrix according to a plurality of phase masks loaded by the spatial light modulator and a relative phase value of a to-be-tested object; according to a two-dimensional intensity image matrix, recorded by the array detector, of the to-be-tested object corresponding to each phase mask, a dark stripe between each adjacent pixel points in each two-dimensional intensity image matrix is judged; then the phase ratio between the adjacent pixel points is obtained through combining the reference library matrix; according to a preset standard pixel point and a planned rout, a multiplicative ratio between each pixel point and the standard pixel point is generated, and phase imaging of the to-be-tested object is constructed. The invention also provides a phase imaging method based on dark stripe logic judgment. The device and method have the advantages of low computational complexity, high phase reconstruction accuracy, global optimality and the like.

The invention provides a phase reconstruction method based on current frequency-domain amplitude measurement. The method can quickly obtain missed phase information of the frequency-domain current, and can quickly predict the electromagnetic radiation level of an automobile wire harness by utilizing the current measurement amplitude and the calculated current phase information. The method can obtain common-mode current distribution and radiation prediction of a 30 MHz-1000 MHz cable and mainly comprises two parts: 1) obtaining of wire harness common-mode current: measuring the common-mode current, fitting the measurement results to obtain a smooth measurement curve, calculating common-mode parameters by utilizing a TRR optimization function and calculating phase distribution by utilizing a transmission line current calculation expression; and 2) prediction of common-mode radiation: serving the common-mode current obtained in the step 1) as a radiation source, calculating common-mode radiation of the wire harness by utilizing a wire harness multi-dipole antenna, calculating common-mode radiation of a finite conductive surface by utilizing a surface current method, and adding the two radiations to obtain the total radiation level.

The invention belongs to the field of optical measurement, and discloses an instantaneous two-dimensional photoacoustic wave measuring method based on femtosecond single-pulse interference. The methodcomprises the following steps: 1) an ultra-fast imaging system is constructed, and the synchronization of a mode-locked femtosecond laser, an acousto-optic pulse selector, a pumping pulse, a detection pulse and a camera frame rate is realized; 2) power amplification is carried out after a femtosecond pulse is subjected to frequency reduction: the frequency reduction is carried out on the mode-locked femtosecond laser with high repetition frequency, and the power amplification is carried out on the femtosecond pulse subjected to the frequency reduction; 3) a photoacoustic wave induction generating module is used for forming photoacoustic waves and filtering out light background noises; 4) a Mach-Zehnder interference method is adopted to realize reference light and measurement light interference, the reference light is subjected to high-frequency modulation, and a signal-to-noise ratio of interference fringes is increased; and 5) a single-pulse interference image is acquired within single camera exposure time, and instantaneous two-dimensional photoacoustic wave measurement is completed by utilizing a Fourier transform phase reconstruction algorithm. By utilizing time synchronization of camera exposure and ultrashort pulses, ultrafast imaging of subpicosecond time resolution is obtained through experiments.

The invention provides a HRTF frequency division band linear regression method based on physiological parameters. Firstly, HRTF of different subjects under the same azimuth in a CIPIC database is selected for principal component analysis to obtain principal component under the azimuth. Then, the correlation between principal components and physiological parameters of different subjects at different frequencies was calculated. The physiological parameters of low frequency, middle frequency and high frequency were obtained by statistical method. Finally, through the selected physiological parameters of low-frequency, intermediate-frequency and high-frequency linear fitting, phase reconstruction by the minimum phase method. The invention has different influence on different physiological parameters, The correlation analysis is applied to obtain physiological parameters affecting HRTF in different frequency bands, and linear regression is carried out by using the physiological parameters,so that the HRTF synthesized by the invention is clearer in theory and the results of linear regression are more accurate for each frequency band respectively.

The invention provides a phase reconstruction method in a two-dimensional Fourier transform electronic spectrum. The method at least comprises the following steps: carrying out inversion calculation on spectral interference and an inverse Fourier transform on a frequency modulated interference spectrum D(omega t, tau), filtering off direct current and alternating current terms in a time domain, then carrying out a discrete Fourier transform on the alternating current term to retrieve frequency domains, regaining S0 (omega t) and f (omega t), and calculating through S0 (omega t) and f (omega t) to obtain amplitudes of local oscillation pulses and amplitudes and phases of photon echo signals. According to the invention, phase error sources are analyzed and inquired to find that phase errors of 2DES (Two-Dimensional Electronic Spectroscopy) have some relevance to zero delay determining errors of coherence time and detection, time linear dependence of coherence and phases on an emission axis along with emission frequencies is effectively eliminated, and a real two-dimensional absorption spectrum is further reconstructed.

The present invention is directed to a receiver for a wire-free communication system for reception of a received signal which is modulated using a digital modulation method having a first frequency conversion device for production of a frequency-converted received signal by conversion of the received signal to an intermediate frequency. The receiver further includes a pre-filter for production of a filtered received signal from the frequency-converted received signal such that the received signal is band-limited, and an analogue/digital converter for production of a binary received signal from the filtered received signal by comparison of the filtered received signal with a level threshold. In addition, the receiver includes a phase reconstruction device for production of a phase-reconstructed received signal by reproduction of the phase of the received signal from the time intervals between zero crossings of the binary received signal, and a mapping device for production of a bit sequence by mapping symbols from the phase-reconstructed received signal onto this bit sequence using the digital modulation method.

The invention relates to a phase reconstruction method based on wavelet domain regularization. The phase reconstruction method comprises placing a knife edge instrument on the plane position of the object to be imaged, acquiring and obtaining a knife edge image, and obtaining a two-dimensional point spread function;. placing the imaging object, imaging the object, and obtaining a phase contrast imaging result; performing two-layer wavelet transformation on the phase contrast imaging result diagram; performing Fourier transformation on the signal of each wavelet channel, and performing regularization processing to obtain the component of the absorbing item in the wavelet channel; performing inverse Fourier transformation on the component of the absorbing item in the wavelet channel to obtain the absorbing item of each channel of the space domain; performing the wavelet inverse transformation so as to obtain the phase contrast image absorbing item after being subjected to the wavelet domain regularization; and obtaining the phase information reconstruction result.

The invention discloses a phase reconstruction method for single interference fringes with the carrier frequency. The method is characterized in that firstly, a single interference fringe pattern withthe carrier frequency acquired by an interference measuring device is read; secondly, fringes in the circular contour in the interference pattern are extended through the extension method based on the largest stripe similarity, and the interference fringes are extended from a circular domain to a rectangular region; two-dimensional Fourier transform is performed on the rectangular interference fringes after extension, a top view image of the spatial spectrum is subjected to binary and corrosion expansion image processing to determine the boundary and centroid coordinates of the positive first-order spectrum, and a carrier frequency component is demodulated through translation; two-dimensional inverse Fourier transform is performed on a demodulated carrier frequency component to obtain a wrapped phase; and lastly, a wavefront phase is reconstructed through the discrete two-dimensional cosine transform unwrapping algorithm. The method is advantaged in that compared with an interferencefringe analysis method in the prior art, programming and automation of the algorithm are easy to realize, and phase reconstruction accuracy can be improved.