69 results about "Particle field" patented technology

The present invention is whole particle field measuring method and equipment based on laminar laser imaging and features that particles in test flow field are illuminated with orthogonal laminar laser beams and two CCD cameras are used to take the particle motion locus images both in the direction perpendicular to the flow field and in the direction parallel to the flow field separately. The equivalent diameters of particles are determined via particle image distinction and statistical analysis of covered pixels, and the particle motion speeds, including magnitudes and directions, are determined via the distinction and analysis of particle motion locus image, so as to obtain the size spectrum and speed field distribution of particles in the imaging plane. The present invention needs no addition of tracing particle, and may be used widely in the two-phase and multi-phase flow field measurement in various fields.

The invention relates to a digital holographic measurement technology of a particle field and aims to provide a compact digital holographic apparatus and method of a particle field. The apparatus comprises a laser source and a spatial filter, a collimating beam expander, a beam splitter and a first half transparent and half reflecting mirror which are sequentially arranged along the transmitting direction of the laser source, wherein the beam splitter, an attenuator and a second half transparent and half reflecting mirror are sequentially arranged in the direction vertical to the transmitting direction of the laser source; a totally reflecting mirror, the second half transparent and half reflecting mirror, an imaging lens and a CCD (charge coupled device) detector are sequentially arranged in the direction opposite to the transmitting direction of the laser source; the totally reflecting mirror corresponds to the first half transparent and half reflecting mirror; and the CCD detector is connected to a computer through a signal wire. The apparatus can conveniently control the recording plane of a hologram, and particularly can ensure the recording plane to be at the right side of the first half transparent and half reflecting mirror. The laser transmitting and CCD receiving can be arranged at the same side, so that a digital holographic system is compact and portable.

To measure property-specific distributions like surface area and mass concentrations, in a particle field that attenuates light passing therethrough, such as a spray or aerosol, a probe beam having a suitably selected wavelength is directed into and thereby caused to interact with the particle field. Light produced by this interaction is detected by sensors separated a distance from the beam. Extinction of the probe as it propagates through the particle field is quantified by determining the amount of light exiting the field in comparison with the amount of light entering the field. The property specific concentrations are determined from the light detected by the sensors after correcting for the extinction of the beam as well as attenuation of the light traveling the distance from the beam to the sensors. The light produced by the interaction of the probe with the particle field may include scattering, fluorescence, or both. Further, methods enable the user to determine the mass and surface area distributions of a spray or aerosol by traversing a single laser beam through the ensemble of particles to be investigated.

The invention discloses a 3D-3C particle image velocity measurement system and method based on an integrated imaging technology. The system includes a laser, a laser beam expansion and collimation system, a 3D flow field velocity measurement box, a camera array, a computer, a plane calibration board, and a precision electronic control translation table. The method includes the following steps: putting the plane calibration board in the 3D flow field velocity measurement box to calibrate the camera array; putting a tracer particle in the 3D flow field velocity measurement box, and using the camera array to image the tracer particle at different angles; re-projecting a camera image of the camera array on a known plane in a world coordinate system Z to produce a refocus image; getting a refocus image sequence by changing the Z value at equal intervals, discretizing the refocus image sequence, and saving the gray values to discrete grids; and extracting tracer particle points in different depth regions through a method based on gradient transform of a moving window, determining the positions of the tracer particle points, and reconstructing a tracer particle field. The system and the method have the advantages of high precision and high computation speed, and can be used to highly restore the details of a flow field.

A method for unify control of corrosion electric drive of reinforced concrete structure belongs to that technical field of civil engineering. The method is as follows: according to the driving force of particle field evolution in concrete under unified electric field, Nernst-Planck equation; the thermodynamic model of interaction between pore solution and hydration product, Poisson equation of electric field distribution and Richards equation of water transport in concrete during particle field evolution are coupled into Nernst-Planck equation; Electrode Dynamics Response of Steel-Mixture Interface under Electric Field Considering Electric Drive and Unified Corrosion Control; thus, the basic theoretical model of unified corrosion control of reinforced concrete structure driven by electricity is formed. Based on MATLAB language, the numerical model is solved by operator splitting algorithm. In the numerical results, the distribution of water content, ionic concentration of pore solution, hydration product content and local current density on the surface of steel bar can be obtained, which provides scientific basis for corrosion control of reinforced concrete structures.

The invention discloses a particle focusing glare point speed measuring method based on correlation matching. The method is characterized in that a particle IPI focusing glare point of the time sequence is recorded, on the basis of a centroid method and a sequence template matching method, particle positioning of sub-pixels is realized, candidate particles are searched according to a maximum displacement and speed direction criterion, then on the basis of a cross correlation method, particle recognition matching with the high accurate recognition rate is achieved, the effect is that the methodis provided for the particle speed measurement based on the IPI focusing point, moreover, quite high speed measurement precision and quite high matching accuracy are achieved, and the method can be used for speed distribution measurement of the of particle fields such as sprayed mist, bubbles and flow fields.

The invention discloses a mixed field particle size measuring method based on average filtering. The average filtering and the 3 sigma criterion are taken as bases, particle sizes are calculated through different template coefficients, and the obtained average particle size value is taken as a final particle size calculation result; multiple calculation results are adopted for judgment, so as to get rid of the gross error and improve the measurement accuracy. The mixed field particle size measuring method has the effect of providing bases for measurement of the complex particle field, and meanwhile the selecting principle of the average filtering template of an interference fringe diagram can be obtained, so as to provide experimental bases for measurement of particles with different sizes in an optical system.

The invention relates to the field of holography, particularly a particle field transient multi-picture holography device and a particle field transient multi-picture holography method. Aiming at the situation that multi-picture continuous particle field transient holography cannot be carried out in the prior art, the invention provides the particle field transient multi-picture holography device and the particle field transient multi-picture holography method based on a photo-induced polymer. The device comprises a coherent light generating device, an object light regulating device, a reference light regulating device, a synchronization control device, a holographic plate and the like. The method provided by the invention comprises the following steps that the synchronization control device is used to detect the particle field and send signals to the coherent light generating device and a light beam deflection device; the coherent light generating device generates two paths of coherent light according to the signals; one path of the coherent light forms the object light with the particle field information through the object light regulating device; the other path of coherent light forms the reference light through the reference light regulating device; the object light and the reference light form interference fringe on the holographic plate to be recorded by a photo-induced holographic plate. The device can be applied to the field of holography.

The invention discloses a method for simultaneously measuring the particle size and the refractive index. The method includes the steps that two sheet light beams with the equal intensity are used foroppositely irradiating a particle, and in a 90-degree scattering angle area and a lateral scattering angle area, focused images and/or interference fringe patterns which are formed through particle scattered light are/is simultaneously recorded, wherein in the 90-degree scattering angle area, the focused images or the interference fringe patterns, formed through p=0 order reflected light on the particle surface, of the two opposite light beams are recorded, and in the lateral scattering angle area, the focused image or the interference fringe pattern formed through p=0 order reflected light and p=1 order refracted light generated after any single light beam passes through the particle is recorded; focused two-point-image intervals or/and the fringe quantity of the fringe patterns collected in the 90-degree scattering angle area and the lateral scattering angle area are extracted, and through calculation, the particle size d and the refractive index n are obtained. The noncontact measurement method has the advantages of being simple in principle, high in measurement accuracy, high in practicability and the like, and can be used for simultaneously measuring a spraying particle field, the aerosol particle size and the refractive index.

The invention discloses a particle field measurement device based on infrared holography, and belongs to the field of infrared holographic application. The device comprises an infrared laser, an infrared total reflection mirror I, an infrared beam splitting mirror I, an infrared beam splitting mirror II, an infrared total reflection mirror II, an infrared beam splitting mirror III, an infrared beam splitting mirror IV, an infrared total reflection mirror III, an infrared beam splitting mirror V, an infrared CCD I, an infrared CCD II, an infrared beam expanding mirror I, an infrared collimatingmirror I, an infrared beam expanding mirror II, an infrared collimating mirror II, an infrared beam expanding mirror III, an infrared collimating mirror III, an infrared beam expanding mirror IV, aninfrared collimating mirror IV, germanium flat crystal I and the like. The device disclosed by the invention is used for measuring the particle field, and the three-dimensional full-field distributionof the particle field can be recorded under the condition that an object field is not disturbed, so that the information, such as size, shape, position, speed, acceleration and the like, of the particles can be obtained, and the imaging quality and the detection result of the particle field detection are improved.

A system and method for detecting the presence of and/or removing or disabling RFID tags in commercial items. In one embodiment, the commercial item is subjected to an electromagnetic or particle field of sufficient energy to destroy any embedded RFID tags. In another embodiment, RFID tags are interrogated and located by a local receiver where they then can be removed or destroyed. In still another embodiment, a commercial item is scanned by x-ray similar to existing security systems. Embedded RFID tags are located either manually or automatically and then either removed or destroyed. The detection and removal of RFID tags is also a business method where a fee can be charged for clearing an item of hidden or embedded RFID, tags.

The invention relates to a particle field optical holographic high-precision reproduction collecting system and a particle field optical holographic high-precision reproduction collecting method. A beam expanding alignment unit, a particle field information carrier, an imaging lens, and a charge coupled device (CCD) are arranged on the output optical path of a laser in turn, and the CCD is connected with a computer; the sensitive face of the CCD is positioned at the rear focusing face of the imaging lens; the particle field information carrier is a holographic photographic plate carrying particle field information; a carrier positioning and moving device comprises a three-dimensional translation platform; a CCD positioning and moving device comprises a one-dimensional translation platform and a lens focusing face positioning device; the lens focusing face positioning device comprises a positioning part and a standard partition plate; and the standard partition plate is arranged on one end face of the positioning part, while the other part of the positioning part is connected with an object face side of the imaging lens. The device and the method solve the problems of low efficiency and low precision of the conventional optical path adjustment and low final data precision of the system caused thereby, realize accurate adjustment to the system optical path according to the lens imaging principle and improve the final data precision of the system.

Methods and apparatuses to image particles are described. A plurality of illuminating light beams propagating on multiple optical paths through a particle field are generated. The plurality of illuminating light beams converge at a measurement volume. A shadow image of a particle passing through a portion of the measurement volume at a focal plane of a digital camera is imaged. Shadow images of other particles in the particle field are removed using the plurality of illuminating light beams.

The invention discloses a phase field and particle field development and evolution theoretical model of a saturated steel-concrete structure under a stray electric field. Compared with a traditional isothermal adsorption empirical model, the theoretical model takes thermodynamics as a theoretical basis. The method comprises the following steps: firstly, through minimization of Gibbs free energy of a system, based on three thermodynamic models, namely a pure phase dissolution deposition equilibrium model, a solid solution model (an ideal solid solution and a non-ideal binary solid solution) and a double electrode layer complex reaction equilibrium model, obtaining initial values and interaction of lower phase and pore liquid particles of the cement-based system; secondly, performing coupling of the thermodynamic model and the finite element model through an operator splitting method, and then calculating a phase field and a particle field. Therefore, a scientific basis and a theoretical model are provided for accurately calculating the particle field and the phase field of the pore liquid in the concrete under the action of the stray electric field.

The invention discloses a digital holographic particle measuring device based on diaphragm spatial modulation. The device comprises a laser light source; a spatial filter and a beam expander, including a spatial filter and a beam expander; a measuring area, particles to be measured being distributed in the measuring area; adiaphragm modulation unit comprising a first lens, a diaphragm and a secondlens through which the object light passes in sequence; an image recording unit comprising a CCD or CMOS digital camera; and a data processing unit. The invention also discloses a digital holographicparticle measurement method based on diaphragm spatial modulation. The method comprises the following steps: generating a collimated light beam by using the laser light source and the spatial filtering and beam expanding unit to irradiate a particle field of a measurement area; carrying out spatial modulation on the particulate matter light by adopting a diaphragm modulation unit; recording a holographic interference fringe image of the particles by using a CCD or CMOS digital camera; and reconstructing and analyzing the recorded particle holographic interference fringe image to obtain particle information. The device and the method provided by the invention can realize rapid monitoring of the particle size of the particles and reduce mutual overlapping and interference among the particles.

The invention relates to a particle field holographic 4F imaging system and method. The invention particularly relates to a particle field holographic 4F imaging system and method based on filtering.The problems that when an existing 4F imaging device based on filtering is adopted for measurement, high-precision adjustment is difficult, the imaging quality is low, recorded image noise is large, imaging background noise is large, the test cost is high, and when a front lens set, a rear lens set and a filtering device are integrated, the filtering device cannot be replaced in different application scenes are solved. The 4F imaging system is characterized in that the system comprises a pulse laser, a beam expanding collimating mirror, a 4F imaging device and a recording medium which are sequentially arranged along a light path; the 4F imaging device comprises a front lens group, a vacuum assembly and a rear lens group; the vacuum assembly comprises a vacuum assembly sleeve, a filtering device, a first vacuum valve, a second vacuum valve, a front vacuum sealing window and a rear vacuum sealing window; the filtering device is detachably connected with the vacuum assembly sleeve in a sealing manner; and the filter glass is high-pass filter glass.

The invention discloses a high-precision and wide-size particle field measurement method. According to the method, on the basis of IPI systems in dual/multiple angles and different polarization states, out-of-focus fringe patterns generated by particle scattering light are recorded simultaneously, the fringe numbers or fringe frequencies of the fringe patterns acquired at different scattering angle areas are extracted, the particle size is calculated, and the measurable particle size range is the measurable minimum particle size and maximum particle size interval of the dual/multiple systems.The noncontact measurement method has the advantages of being simple in principle, high in measurement precision and practicability and the like and can be used for spray particle field and aerosol particle field measurement.

The invention discloses a particle reconstruction method and device in a three-dimensional flow field, an electronic device and a storage medium. The particle reconstruction method in the three-dimensional flow field comprises the following steps: acquiring a two-dimensional image formed by collecting particles in the three-dimensional flow field; obtaining an initial three-dimensional matrix based on an initialization algorithm according to the two-dimensional image; inputting the initial three-dimensional matrix into a neural network; and obtaining a three-dimensional particle field based onthe output of the neural network.

The invention discloses a magnetic particle field current separating device and method based on a rotating magnetic field. The device comprises a three-phase winding which comprises a first phase winding, a second phase winding and a third phase winding. The first phase winding, the second phase winding and the third phase winding are connected in a star shape and are symmetrically arranged on a base with the axis of the base as a shaft. The initial ends of the first phase winding, the second phase winding and the third phase winding communicate with the output end of a three-phase power source. Output current of the three-phase power source is symmetrical three-phase sine alternating current. The base is of a hollow structure, and a separation channel is formed in a space designed by thebase. According to the magnetic particle field current separating device, the separation channel is arranged in the internal cylindrical space defined by the three-phase winging and the base, and magnitude and frequency of three-phase voltage added to the three-phase winding are adjusted through a frequency converter. The frequency of magnetic particles affected by the rotating magnetic field is controlled, the magnitude of magnetic induction intensity of the separation channel is changed, and filed current separation of the magnetic particles with different particle diameters or magnetic particles which are the same in particle diameter but different in magnetic susceptibility.