91 results about "Single excitation" patented technology

The invention relates to the field of magnetic field generation, and discloses a multi-mode array magnetic field generation system and method. The single excitation source matrix excitation comprises an FPGA main control chip and a DDS signal generation module, a DDS chip reads a signal waveform stored in an ROM, a keying module is combined with a PLL clock signal module and an amplification circuit, signals with adjustable amplitude, frequency, phase and duty ratio are achieved, excitation is applied to an array coil through bipolar D / A conversion to generate magnetic fields of different modes, and the magnetic fields of different modes are generated. The Hall magneto-dependent sensor is combined to adjust the angle and direction of the generated magnetic field in real time, and the focusing angle of the magnetic field is dynamically changed. The array coil is excited by generating a plurality of current signals with different amplitudes, frequencies, phases, duty ratios and directions, and the Hall magneto-dependent sensor above the coil is combined, so that the energy and direction of an array magnetic field are controllable, the magnetic field generation efficiency is improved, and the detection target is enhanced.

The invention relates to the technical field of spectrum detection and optical imaging, and provides a time domain stimulated Raman scattering method and system.The method comprises the steps that pumping pulses or Stokes pulses are modulated, two stimulated Raman excitation pulse pairs with adjustable relative delay are introduced, a to-be-detected sample is excited to generate transient stimulated Raman scattering, and the time domain stimulated Raman scattering is obtained; transient stimulated Raman scattering signals can be obtained, acquisition of hyperspectral data covering hundreds of wave numbers can be achieved only through single excitation, and the method has the advantage of being high in time resolution. Meanwhile, the spectral resolution of the vibration level life broadening limit can be obtained through the method, and the main technical bottleneck faced by the traditional stimulated Raman scattering spectrum technology can be solved at a time. The method can be applied to the fields of Raman scattering imaging, spectrum detection, related Raman probes and the like.

The utility model relates to an integrated shunt excitation device. The integrated shunt excitation device specifically comprises an excitation fuse, a trigger module and a shunt module, the excitation fuse comprises an electronic ignition assembly, a piston and a conductive piece. The diverter module is connected in series in the conductive part to replace the part, needing to be disconnected, of the conductive part, the trigger module is connected with the diverter module and the electronic ignition assembly, and the trigger module starts the electronic ignition assembly according to a received current signal monitored by the diverter module when the current signal exceeds a set threshold value. The trigger module sends a trigger signal to the electronic ignition assembly to enable the electronic ignition assembly to act to release high-pressure gas to drive the piston to disconnect the diverter module and disconnect the main loop. According to the invention, the diverter replaces the to-be-disconnected part of the conductive member, so that the conductive member is relatively simple in structure, and the excitation device is smaller in size.

The invention discloses a structural dynamics model correction method, and belongs to the technical field of model correction. S10, establishing a finite element model of the structure, and setting a correction variable and a value range and an initial value thereof; s20, modal finite element analysis and experimental test value comparison are carried out; s30, if the error between the simulation value and the test value exceeds the allowable range, the step S20 is repeated, and the finite element model is updated; s40, updating the finite element model by utilizing a correction result in the step S30; s50, resetting the correction variable, the range of the correction variable and the initial value of the correction variable; s60, harmonic response finite element analysis and experimental test value comparison are carried out; s70, if the error between the simulation value and the test value exceeds the allowable range, adjusting the correction variable, and repeating the step S60 until the error meets the requirement; and S80, updating the finite element model to complete correction. According to the method, data of a plurality of excitation points and a plurality of response points are included at the same time, the problem of model correction result deviation caused by only using a single excitation point or a single response point at a time is effectively avoided, and the reliability and accuracy of a correction result are improved.

The invention belongs to the technical field of nondestructive testing, and relates to a method for imaging residual oil in a powder metallurgy component based on pulse thermal excitation, which comprises the following steps: applying preheating disturbance pulse to a target area to generate a pre-excitation thermal field; applying a main detection pulse to the same target area at an interval of a preset time lag, and generating a transient composite hot spot; obtaining the whole process from formation to cooling dissipation of the transient composite hot spot, and generating a dynamic thermal field image sequence; images in a specific time window are extracted, and a key stage hot spot evolution image set is generated; the physical state of residual oil in the target area is judged, and a residual oil state label is generated; performing mapping association on the residual oil state label generated at each detection position and the two-dimensional coordinate of the residual oil state label to generate a residual oil state visual image; according to the invention, the problem of missing detection or misjudgment caused by difficulty in effectively amplifying weak thermal physical property difference between oil liquids in different states due to single excitation mode in the existing thermal imaging technology is solved.

The invention relates to an ultrasonic-assisted longitudinal-torsional compound vibration two-roller rolling device, and belongs to the technical field of ultra-thin strip rolling. According to the device, the ultrasonic longitudinal-torsional vibration device is combined with the rolling mill, so that the deformation resistance of materials is effectively reduced, the surface roughness is improved, grains are refined, and the residual stress is reduced by utilizing ultrasonic vibration. The device comprises a rolling mill rack, an ultrasonic longitudinal-torsional vibration device, a winding device, a winding assisting device and an unwinding device. The ultrasonic longitudinal-torsional vibration device is composed of a variable-amplitude roller shaft, a connecting shaft, piezoelectric ceramics, a copper electrode, a rear cover plate and a hexagon socket screw, and has a single-excitation form and a double-excitation form. The single excitation device adopts a quarter-wavelength conical amplitude-change pole, a spiral groove is formed in the conical surface of the quarter-wavelength conical amplitude-change pole, and longitudinal vibration can be partially converted into torsional vibration; according to the double-excitation device, the torsional vibration amplitude is increased through cooperation of two longitudinal-torsional amplitude-change poles which are symmetrically arranged. The device is compact in structure, small in energy loss, high in machining precision and suitable for production of high-precision ultra-thin strips.

The invention discloses a non-intrusive sensor with an external excitation source and a voltage measurement method, and the non-intrusive sensor comprises an induction signal collection unit, an induction signal conditioning unit, and a main control unit. The main control unit is respectively connected with the induction signal conditioning unit and the cable power supply, the induction signal conditioning unit is connected with the induction signal acquisition unit, and the induction signal acquisition unit is in non-contact inductive coupling connection with a cable to be detected; the main control unit is used for injecting the specific excitation signal into an alternating current loop of a cable power supply to form a composite signal, analyzing the composite signal based on a preset excitation source amplitude parameter, and calculating the power supply voltage of the to-be-detected cable; the induction signal acquisition unit generates a corresponding induction signal by capturing electric field energy generated by a composite signal in the to-be-detected cable; the induction signal conditioning unit carries out standardization processing on the induction signal. According to the invention, the technical problems of low external excitation voltage measurement precision, low system integration and single excitation source generation mode in the prior art are solved.

The invention provides a method, device and equipment for exciting a single-mode guided wave in grounding flat steel, and belongs to the technical field of engineering structure detection, and the method comprises the steps: building a two-dimensional section model of the detected grounding flat steel through finite element analysis software, defining boundary conditions for the width and thickness in the two-dimensional section model, and carrying out the mode analysis and solving of the grounding flat steel. Performing statistics to obtain frequency-wave number data; based on frequency-wave number data, a phase velocity frequency dispersion curve and a group velocity frequency dispersion curve are drawn, after a corresponding mode is selected, excitation of specific single-mode guided waves is achieved in combination with a wave structure diagram and the application size and direction of a modulation load, and due to the fact that a two-dimensional section model including a width condition is obtained through finite element analysis, the excitation accuracy of the guided waves is improved. The phase velocity frequency dispersion curve and the group velocity frequency dispersion curve are recalculated, the corresponding wave structure diagram is combined, and the appropriate modal guided wave under the specific frequency is reselected for single excitation, so that the appropriate modal can be more accurately selected, and the defect detection accuracy is improved.

The invention discloses a method for quantitatively evaluating the three-dimensional shape of a thinning defect in a plate under ultrasonic guided wave field undersampling scanning, belongs to the field of industrial nondestructive testing, and particularly relates to high-precision three-dimensional shape reconstruction and thickness loss quantification of a corrosion defect in a metal plate shell structure (such as aerospace skin, a pressure vessel wall, an oil pipeline and the like). According to the method, sparse sampling guided wave field reconstruction, full waveform inversion (FWI) and priori knowledge constraint are fused, Shannon sampling theorem limitation is broken through, efficient measurement of corrosion depth, contour and distribution under the conditions of a single excitation source and a limited view angle is achieved, and the method is suitable for rapid online detection in a complex industrial environment.

The invention relates to the field of rotary ultrasonic machining, and specifically discloses a longitudinal-bending composite rotary ultrasonic vibration special-shaped amplitude transformer, wherein the amplitude transformer comprises a single-excitation longitudinal vibration input portion, an amplitude transformer transmission portion, a vibration node portion, a dynamic balance vibration separation portion, and a longitudinal-bending composite output portion in order from an input portion to an output portion; wherein the single-excitation longitudinal vibration input portion, the amplitude transformer transmission portion, the vibration node portion, and the longitudinal-bending composite output portion are coaxially arranged, and the single-excitation longitudinal vibration input portion, the amplitude transformer transmission portion, the vibration node portion, and the longitudinal-bending composite output portion are all centrally symmetrical structures, and the dynamic balance vibration separation portion comprises a bending vibrator structure and a longitudinal vibrator structure with different cross-sectional areas, the masses of the bending vibrator structure and the longitudinal vibrator structure are equal, and the centers of mass of the bending vibrator structure and the longitudinal vibrator structure are symmetrically arranged about the axis of the amplitude transformer rotation axis; the invention can change the vibration mode, convert the single-excitation longitudinal vibration into a longitudinal-bending composite vibration, and avoid the problem of dynamic imbalance in the rotation process.

The invention provides a construction method of an excitation operator in a variable component child solicitation algorithm, and the construction method of the excitation operator in the variable component child solicitation algorithm comprises the following steps: carrying out the base transformation of a CRY gate, and constructing a quantum circuit of a single excitation operator; a quantum circuit of a double-excitation operator is constructed by performing base transformation on a C3RY gate. According to the technical scheme, the quantum circuit of the single excitation operator is constructed by performing base transformation on the CRY gate; the C3RY gate is subjected to base transformation, a quantum circuit of a double-excitation operator is constructed, the use number of CNOT gates is reduced, and the depth of the quantum circuit is reduced.

The invention discloses a method and a system for determining reaction activity of material molecules based on quantum computing, and relates to the technical field of material performance analysis based on quantum computing, the method comprises the following steps: generating UCCSD (Unified Conduction Cancellation Spectroscopy) simulation of target material molecules, which comprises a plurality of double-excitation operators and single-excitation operators; calculating a relative contribution estimated value of each double-excitation operator to a molecular ground state energy level by adopting an approximation method; screening operators with estimated values higher than a threshold value or selecting the first N operators as key double-excitation operators in sequence; the UCCSD is combined with all the single excitation operators to form final UCCSD simulation; and constructing a quantum circuit based on the configuration, and further determining the molecular reaction activity. By approximately calculating the relative contribution estimated value and screening the key double-excitation operator, the calculation precision is ensured while the resource consumption is remarkably reduced, so that the reaction activity of the material molecules is reliably determined, and the defect that the efficiency and the precision are difficult to consider at the same time in the prior art is overcome.

The invention discloses a near-infrared two-region dual-channel fluorescent nanoprobe as well as a preparation method and application thereof, and relates to the technical field of biomedical imaging. A nano probe A and a nano probe B included in the near-infrared two-region dual-channel fluorescent nano probe are both of a core-shell structure, two NIR-IIb fluorescent nano probes adaptive to different excitation wavelengths (808 nm and 980 nm) are constructed by precisely regulating and controlling the types and proportions of lanthanide elements, dual-channel imaging is achieved, limitation of a single excitation wavelength is broken through, spectral crosstalk is eliminated, and the near-infrared two-region dual-channel fluorescent nano probe has the advantages of high sensitivity, high sensitivity, high sensitivity and the like. The method has the characteristics of material uniformity and biological safety. The near-infrared IIb region dual-channel imaging system has the characteristics of high temporal-spatial resolution and signal separation, and has significant application value in the field of living body multi-target synchronous observation. Compared with a traditional two-photon microscope technology, the imaging method has a wider observation view field, a local craniotomy operation does not need to be carried out on an experimental mouse, and physiological trauma is remarkably reduced.

The application belongs to the technical field of tunnel geological advanced prediction, and provides an electromagnetic controllable excitation device and method for longitudinal and transverse wave excitation of a deep-buried tunnel. The excitation device comprises a body, longitudinal and transverse wave excitation plates arranged on the body, and a rotating mechanism arranged on the body. The longitudinal and transverse wave excitation plates are perpendicular to each other, and the rotating mechanism is connected with a mechanical arm. The rotating mechanism is used to realize the operation switching of the longitudinal and transverse wave excitation plates at the same physical position, and longitudinal and transverse wave excitation is performed. The longitudinal and transverse wave excitation functions are integrated in a single excitation device, the structure is compact, and the device is suitable for operation requirements in a narrow space area in a tunnel. The rotating mechanism is used to realize 90-degree rapid switching, the detection efficiency is greatly improved, the physical positions of two times of excitation are completely consistent, and the data comparability is improved.

The invention belongs to the technical field of tunnel geology advanced prediction, and provides an electromagnetic controllable excitation device and method for longitudinal and transverse wave excitation of a deep tunnel, a vibration exciter comprises a body, a longitudinal wave excitation plate and a transverse wave excitation plate which are arranged on the body, and a rotating mechanism arranged on the body; the longitudinal wave excitation plate and the transverse wave excitation plate are perpendicular to each other, and the rotating mechanism is connected with the mechanical arm. Operation switching of the longitudinal wave excitation plate and the transverse wave excitation plate at the same physical position is realized through the rotating mechanism, and excitation of longitudinal waves and transverse waves is carried out; the longitudinal wave excitation function and the transverse wave excitation function are integrated into a single vibration exciter, the structure is compact, the device meets the operation requirement of a narrow space area in a tunnel, 90-degree rapid switching is achieved through the rotating mechanism, the detection efficiency is greatly improved, it is ensured that physical positions of two times of excitation are completely consistent, and the data comparability is improved.

The amplitude-change pole comprises a large beam and a small beam, the large beam is a straight beam, the center line of the large beam extends along the Z axis, and a threaded blind hole is formed in the rear end face of the large beam in the Z-axis direction and used for fixing a piezoelectric ceramic set; the small beam is a Y-Z plane inclined beam, the center line of the small beam is located on the Y-Z plane and forms a certain angle with the Z axis and the Y axis, and a rectangular section groove and a threaded through hole are formed in the front end of the small beam and used for installing and fixing a turning tool. The large beam is connected with the small beam through an interface; a flange is arranged in the middle of the girder, and through holes which are evenly distributed along the circumference are formed in the flange and used for fixing the amplitude-change pole to a rack. Two-dimensional elliptical vibration turning can be achieved only through a single excitation source, a control system is simple, phase difference regulation and control are not needed, the size is small, and cost is low.

Techniques for quantum error correction are described that utilize dual track coding of a single excitation in a pair of coupled quantum oscillators. The dual track qubit may be implemented in a cQED (Circuit Quantum Electrodynamics) system that includes a pair of coupled resonators. In this dual track coding, the excitation is stored in one of the two resonators. The excitation of the first resonator is regarded as logic 0, while the excitation of the other resonator is regarded as logic 1. Thus, the two resonators together form a single logical dual track qubit with logical states of 0 > L = 01 > and 1 > L = 10 >.

The application provides a kind of single excitation-receiving module-based speed measurement positioning system, comprising: first, second zero flux coil assembly, excitation receiving module, power supply and signal processing unit, excitation receiving module includes excitation coil, first receiving coil and second receiving coil, excitation coil is set on the first zero flux coil assembly, first receiving coil and second receiving coil are symmetrically set relative to the center line of excitation coil, first receiving coil and second receiving coil are spaced apart on the second zero flux coil assembly, power supply is used to provide direct current to excitation coil, signal processing unit is connected with excitation receiving module, signal processing unit is used to complete the speed measurement and positioning of train according to the first receiving induction voltage of first receiving coil and the second receiving induction voltage of second receiving coil. The technical scheme of the application is used to solve the technical problems of complex speed measurement positioning equipment and large high-speed measurement error in the prior art.

The single-excitation magnetostrictive-piezoelectric mechanical parallel ultrasonic elliptical vibration system and method disclosed by the application comprises a variable amplitude rod, the variable amplitude rod comprises an input large end as a vibration input end and an output small end as a vibration output end, the input large end is fixedly connected with a magnetostrictive transduction branch and a piezoelectric transduction branch respectively, the magnetostrictive transduction branch and the piezoelectric transduction branch are connected in series through a circuit and are electrically connected with an ultrasonic power supply. The beneficial effect is that the application can realize ultrasonic elliptical vibration by using a single AC signal, the inductive impedance of the coil and the capacitive impedance of the piezoelectric ceramic stack can be used for electrical compensation when connected in series, and the application has the characteristics of less driving channel, simple system structure and convenient impedance matching.

This disclosure relates to the field of insulating material testing, including a method and system for evaluating the nonlinear strength of insulating materials based on high-frequency component analysis. The method involves applying an excitation electrical signal of a first preset frequency to the insulating material under test; acquiring the response signal obtained by the insulating material in response to the excitation electrical signal based on a second preset frequency; performing time-frequency transformation on the response signal to obtain the frequency characteristics of various preset higher harmonic components; and determining the evaluation result of the nonlinear strength of the insulating material based on the frequency characteristics of these higher harmonic components. This method allows for obtaining the evaluation result of the nonlinear strength with a single excitation and response acquisition; it eliminates the need for multi-voltage point step testing in traditional techniques, shortening the testing cycle, improving testing efficiency, and enabling efficient, accurate, and standardized determination of the nonlinear strength evaluation result.

The invention discloses a method for detecting peroxynitrite (ONOO) by single excitation. ‑ Near-infrared ratiometric fluorescent probe and its preparation method and application. The structural formula of the fluorescent probe is shown in Formula I below, and is named ER-MPTC (R=H) and ER-DMPTC (R=CH3). The fluorescent probe of the present invention is a reactive probe, and the fluorescent probe uses the oxidative cleavage of the carbon-carbon double bond as ONOO ‑ The fluorescent probe of the present invention showed in vitro detection of ONOO ‑ The fluorescent probe of the present invention has good ratio response, excellent selectivity and high sensitivity. At the same time, it has good photostability, is stable in a wide pH range and has an optimal response signal in the physiological pH range, which can meet the requirements of ONOO in biological tissue samples. ‑ testing requirements.

Techniques and systems for motion detection of a logging tool. A system includes a nuclear magnetic resonance (NMR) logging tool configured to perform at least one Carr-Purcell-Meiboom-Gill (CPMG) scan utilizing a plurality of distinct echo times (tE) in conjunction with a single excitation pulse and a single wait time as a multiple echo spacing sequence to acquire NMR logging measurements and a processing system coupled to the NMR logging tool, wherein the processing system is configured to process the NMR logging measurements acquired by the NMR logging tool to determine whether the NMR logging measurements were affected by lateral motion of the NMR logging tool.

The invention belongs to the technical field of chemical detection, and particularly relates to a method for detecting phosphorus content in high-carbon ferro-chrome by utilizing ICP (inductively coupled plasma), which comprises the following steps: 1) adding red acid into a sample, slowly adding concentrated sulfuric acid, adding perchloric acid after violent reaction is finished, heating to 360-380 DEG C, keeping constant temperature, dropwise adding nitric acid until the mixture becomes green, cooling, reboiling and fixing the volume; 2) establishing a working curve: dissolving 6 parts of high-purity iron and high-purity chromium according to the method in the step 1) until the volume of the volumetric flask is constant; (3) gradually diluting the 1000mg / L phosphorus standard solution according to a set curve point; transferring into a volumetric flask with 6 dissolved parts, introducing ICP (Inductively Coupled Plasma) detection, carrying out single excitation detection for 4 times, averaging, and calculating the phosphorus content according to a calibration curve. The method has the advantages that the phosphorus element in the high-carbon ferro-chrome is detected, the operation is simple, and the popularization is easy. In the detection, four times of single excitation detection are averaged, so that individual points are prevented from drifting due to multiple times of excitation, and the accuracy of a detection result is improved.

The invention relates to a shared electrolyser monitoring system and method. Electrochemical impedance spectroscopy (EIS) systems and methods are described herein that facilitate the distribution of a single excitation generator across a plurality of electrolyzer stacks, each electrolyzer stack including a set of electrochemical cells. By distributing excitation signals, impedance data of the cells in each electrolyzer stack can be measured, e.g., assessed their condition or the condition of the stack, without the need for a separate excitation block for each electrolyzer stack. In various embodiments, a shared excitation generator is achieved by sequentially directing excitation signals to different stacks. A final response signal indicative of the impedance of the cell or the entire cell stack is locally processed on each respective electrolyzer stack. Advantageously, the excitation generator can be remotely positioned, for example, in a location constrained by less strict security measures, thereby reducing equipment and operating costs.

The invention provides a defect distribution detection method for an optoelectronic semiconductor device. The method comprises the following steps: S1, injecting a single excitation source with constant parameters into the optoelectronic semiconductor device; s2, the optoelectronic semiconductor device emits light under the single excitation source with the constant parameters, and a light-emitting intensity distribution image, relative light-emitting intensity data phi xy, rel of each pixel point in light-emitting intensity distribution and a light-emitting spectrum phi (N) of the device are obtained; s3, calculating quantum efficiency spectrum distribution at any coordinate position xy in the luminous intensity distribution image of the optoelectronic semiconductor device; s4, calculating carrier collection rate distribution of different layer depths of the optoelectronic semiconductor device according to the quantum efficiency spectrum distribution; s5, calculating the spatial distribution of excessive and minority carriers of different layer depths of the optoelectronic semiconductor device according to the carrier collection rate distribution; and S6, obtaining defect distribution of different layer depths of the optoelectronic semiconductor device. Therefore, the defect distribution of different layer depths can be inverted only by depending on the light-emitting image of the optoelectronic semiconductor device under a single injection condition, and the method has the advantages of simplicity and convenience in operation, low cost and rapidness.

The invention discloses a single-mode guided wave defect detection method and system for an underwater water filling pipeline. The method comprises the following steps: establishing an SAFE-PML wave equation of guided waves in the underwater water filling pipeline; converting the SAFE-PML wave equation into a guided wave characteristic equation, and constructing an expression of guided wave mode energy; establishing a mapping relation between the guided wave modal amplitude and the axial length of the piezoelectric transducer by using modal extension; solving and extracting excitation characteristics of a guided wave mode through a guided wave characteristic equation; parameters of the piezoelectric transducer are optimized according to guided wave excitation characteristics, guided wave signals are collected, the occurrence time of defect signals in the guided wave signals is obtained, and defect detection is conducted on the whole underwater water filling pipeline through a guided wave reflection method. According to the invention, guided wave mode single excitation and defect detection of the underwater water filling pipeline are realized.

A quantum information system comprising a quantum information element and a control line, the quantum information element comprising: a first Josephson element and a second Josephson element, each Josephson element comprising a Josephson junction disposed between two superconducting islands, one of the superconducting islands is shared by the first Josephson element and the second Josephson element; wherein the superconducting island of the first Josephson element is coupled to the superconducting island of the second Josephson element such that the quantum information element comprises a plurality of states, the plurality of states comprising a first state, a second state, and a third state, where there is a single excitation transition between the third state and the first state, and there is a single excitation transition between the third state and the second state; and wherein the control line is configured to encode one of two states of the computing subspace into the quantum information element, a first state of the computing subspace corresponding to the first state, and a second state of the computing subspace corresponding to the second state.

The application provides a construction method of an excitation operator in a variational quantum eigenvalue solution algorithm, and the method comprises the following steps: constructing a quantum circuit of a single excitation operator by performing basis transformation on a CRY gate; and constructing a quantum circuit of a double excitation operator by performing basis transformation on a C3RY gate. In the technical scheme, the quantum circuit of the single excitation operator is constructed by performing the basis transformation on the CRY gate, and the quantum circuit of the double excitation operator is constructed by performing the basis transformation on the C3RY gate, so that the number of CNOT gates is reduced, and the depth of the quantum circuit is reduced.

The invention provides a sensor analog signal acquisition method and device and a medium. The method comprises the steps that excitation currents with M different phases are provided for a Hall sensor through a constant-current excitation source; the Hall sensor generates a Hall voltage signal under the action of the magnetic field to be measured and the excitation current; the signal conditioning circuit generates a reference voltage signal with the same frequency as the excitation current according to the phase information of the excitation current; the signal conditioning circuit filters the Hall voltage signal to obtain a filtered Hall voltage signal; superposing the filtered Hall voltage signal with a reference voltage signal to obtain a composite signal, and amplifying the composite signal through an amplifier to obtain an amplified composite signal; the multi-channel AD sampling module converts the amplified composite signal into a digital signal and obtains the amplitude value of the Hall voltage signal through calculation. Through combination of multi-phase excitation current and orthogonal four-path signal processing, signal quality improvement which cannot be achieved by a traditional single excitation mode is realized.

In one aspect, the present teachings provide a system for performing cytometry that can be operated in three operational modes. In one operational mode, a fluorescence image of a sample is obtained by exciting one or more fluorophore(s) present in the sample by an excitation beam formed as a superposition of a top-hat-shaped beam with a plurality of beams that are radiofrequency shifted relative to one another. In another operational mode, a sample can be illuminated successively over a time interval by a laser beam at a plurality of excitation frequencies in a scanning fashion. In yet another operational mode, the system can be operated to illuminate a plurality of locations of a sample concurrently by a single excitation frequency, which can be generated, e.g., by shifting the central frequency of a laser beam by a radiofrequency. The detected fluorescence radiation can be used to analyze the fluorescence content of the sample, e.g., a cell / particle.