55 results about "Single excitation" patented technology

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 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 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 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.

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 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 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.

The invention discloses a multipurpose comprehensive test system. The multipurpose comprehensive test system comprises an environment simulation box and at least one vibration test bench, the system supports three modes of a vibration test, an environment test and a vibration-environment composite test. The vibration test comprises a single excitation mode and a multi-excitation mode; when multiple vibration tables are excited in parallel, the table surfaces of the vibration tables are arranged in the same straight line along the X axis and are suitable for distributed loading of long test pieces. During a composite test, the environment simulation box hermetically covers the surface of the vibration table to form a closed environment cavity, and the length of the closed environment cavity is greater than the total length of a test piece to ensure that the whole test piece is in a uniform environment. The environment simulation box can move along the Y axis and move to one side of the vibration table when a single test is carried out, parallel development of vibration and environment tests is achieved, and the site and time utilization rate is greatly increased. The system flexibly adapts to test pieces with different sizes through the layout of the movable environment box and the modular vibration table, solves the problem of multi-size test by one set of system, and remarkably improves the equipment compatibility and the application range.

The invention discloses a time domain regulation and control metasurface scattering characteristic simulation method, device and product, relates to the technical field of electromagnetic simulation, and is used for accurately simulating the nonlinear real response of a time domain regulation and control metasurface under a time-varying feed signal. The method comprises the following steps: S1, constructing an electromagnetic simulation model for a time domain regulation and control metasurface and a feed network; s2, integrating a diode dynamic simulation model in the electromagnetic simulation model, wherein the diode dynamic simulation model is a diode simulation model supporting a self-defined impedance function or impedance changing along with voltage / current; and S3, performing scattering characteristic simulation on the electromagnetic simulation model. Simulation of different types of active devices is supported, and key functions such as wave absorbing performance and frequency regulation and control characteristics of the metasurface can be verified through static or dynamic simulation; the limitation that a traditional simulation technology is only suitable for a single excitation source is broken through, and a reliable technical means is provided for performance evaluation of the metasurface in multi-scene application.

The invention relates to the technical field of image processing, in particular to a method for evaluating the renal function of a nephrotic patient through diffusion tensor imaging. The method comprises the following steps: acquiring a kidney diffusion tensor original image through single excitation echo plane imaging; adjacent comparison is carried out on each pixel point, and a signal intensity difference and a gradient direction difference are extracted; judging local geometric distortion according to the difference information, and carrying out correction processing pixel by pixel to obtain a corrected high-quality diffusion tensor image; and finally, calculating a fitting tensor, extracting diffusion parameters of the renal cortex and the renal medullary region, quantitatively comparing the diffusion parameters with preset renal function indexes, and outputting an objective quantitative result of the renal function of the patient. According to the method, through pixel-by-pixel distortion correction and direction feature extraction, the precision of the diffusion tensor image and the accuracy of kidney region division are improved, and objective quantitative analysis of kidney functions is realized.

This invention discloses an environmental noise-adaptive multi-spectral stress wave-acoustic fingerprint damage detection method and system, belonging to the field of non-destructive testing technology. The method constructs a passive-active hybrid excitation, using environmental noise as the passive source combined with an active signal, and adaptively weights this to form an enhanced excitation; it simultaneously acquires signals from 20-150kHz across multiple frequency bands and filters out interference; it constructs a three-dimensional acoustic fingerprint map including a benchmark and calibration; and it achieves defect identification and quantification through acoustic impedance tensor inversion, difference algorithms, and a Bayesian framework. The system includes acquisition, acoustic fingerprint construction, intelligent analysis, and monitoring and early warning modules, which collaboratively complete the entire detection process. This invention solves the limitations of single excitation, environmental interference, and the challenges of detecting complex structures, improving detection sensitivity, accuracy, and environmental adaptability. It is applicable to damage detection of metal and composite material components and has significant engineering value.

The present application relates to the technical field of ferromagnetic material nondestructive testing, more particularly, to a ferromagnetic part magnetic anisotropy detection device based on MBN method and a use method thereof.The detection device comprises a detection part, a signal generator and a signal processing part.The detection part comprises a single excitation coil and multiple receiving coils, wherein the receiving coils are adjusted in position by a movable arm assembly.The present application uses the combination of a single excitation coil and multiple receiving coils, can cover a larger detection area, is suitable for rapid measurement of large parts to be measured, and improves the detection efficiency.Moreover, the movable arm assembly ensures the adhesion of the receiving coils to the surface of the part to be measured, is suitable for different forms of parts to be measured, improves the versatility, and solves the poor versatility of the existing magnetic Barkhausen noise detection equipment.

The invention discloses a use method of an electro-optical double-excitation temperature sensor. The use method comprises a single excitation mode; wherein the single excitation mode is an EL mode or a PL mode; wherein the EL mode is an electroluminescence mode, and the PL mode is a photoluminescence mode; in the PL mode, the fluorescence intensity ratio of two characteristic emission peaks is obtained through a PL spectrum, and the temperature can be obtained according to a pre-calibrated curve; the EL mode specifically comprises the steps that the fluorescence intensity ratio of two characteristic emission peaks is obtained through an EL spectrum, and the temperature can be obtained according to a pre-calibrated curve. Double excitation modes of an EL mode and a PL mode are integrated on the same device, the inherent limitation that an electrical sensor is prone to electromagnetic interference and needs contact measurement is solved, and the serious dependence of an optical sensor on an external light source is overcome.

The invention discloses an environmental noise adaptive multi-spectrum stress wave-voiceprint damage detection method and system, and relates to the technical field of nondestructive testing. According to the method, passive-active hybrid excitation is constructed, environmental noise is taken as a passive source and is combined with an active signal, and enhanced excitation is formed through adaptive weight adjustment; synchronously acquiring 20-150kHz signals in multiple frequency bands and filtering interference; constructing a three-dimensional voiceprint map containing reference and calibration; and defect identification and quantification are realized through acoustic impedance tensor inversion, a difference algorithm and a Bayesian framework. The system comprises an acquisition module, a voiceprint construction module, an intelligent analysis module and a monitoring and early warning module which cooperatively complete whole-process detection. The problems of single excitation limitation, environmental interference and complex structure detection are solved, the detection sensitivity, accuracy and environmental adaptability are improved, and the method is suitable for damage detection of metal and composite material components and has important engineering value.

The invention relates to the technical field of vibration and noise analysis, in particular to a method and device for quantifying an NVH coupling degree index in a multi-source coupling scenario, and the method comprises the steps: collecting vibration and noise signals of at least one excitation source and a target point; identifying a transfer function from the at least one excitation source to the target point based on the vibration and noise signals; calculating a coupling coefficient of at least one excitation source according to the transfer function; constructing a coupling index system based on the coupling coefficient; and according to a quantification result of the coupling index system, determining a coupling effect of which the influence on the NVH performance of the product meets a preset condition and a related excitation source. Therefore, the problems that due to the fact that related calculation mostly depends on a single excitation source to conduct testing and analysis, the superimposed effect generated by the multi-source coupling effect cannot be fully considered, the large deviation exists between the testing result and the actual NVH performance of the product, and the overall NVH performance of the complex product under the real working condition is difficult to accurately evaluate are solved.

The application discloses a kind of based on homologous laser's spectral acoustic wave heterostructure signal insulator detection method, it belongs to insulator detection technical field, it solves the problem that existing insulator detection method cannot detect the defect inside and outside insulator simultaneously.The present application uses the same laser pulse single excitation and synchronously collects spectrum and acoustic wave signal, ensures the homology of signal, lays the physical foundation for synchronous detection of internal and external defects.By introducing equivalent dielectric response parameters and equivalent structure density parameters, the two types of features are physically modulated, which specifically represent the surface composition and internal structure state. After standardization and attention weighting fusion, the integrated representation of insulator comprehensive state is realized, and the rapid and non-contact identification of insulator defects is realized, which is especially suitable for online detection of power equipment.

The invention discloses a multimode fiber dynamic disturbance imaging reconstruction method based on a parallel neural network, and the method comprises the following steps: employing an LED as an illumination light source, and constructing a single-excitation wide-view-field multimode fiber (MMF) imaging system; under the condition that the disturbance range is 0-200 mm, image data of the output end of the multimode optical fiber are collected. By designing a parallel neural network structure, the network can perform efficient feature extraction and accurate image reconstruction on an optical fiber transmission image under dynamic disturbance, and particularly realizes high-fidelity image restoration under a small sample condition. The parallel neural network comprises a plurality of parallel sub-networks, each sub-network specially learns image mapping features under different disturbance conditions, and finally feature fusion is performed at an output end to obtain a stable image reconstruction result. According to the invention, the method has the remarkable advantages of high reconstruction precision, strong anti-disturbance capability and high training efficiency, and provides a novel and effective implementation way for high-fidelity imaging of the multimode optical fiber in a dynamic environment.

The present invention discloses a horn, auxiliary machining system, and machining method for single-excitation three-dimensional ultrasonic vibration. The horn comprises a horn body with a raised force-bearing end and an output end for mounting a tool bit. N inclined slots are provided between the force-bearing and output ends. A PC controls an ultrasonic generator to generate a high-frequency sinusoidal current, driving a piezoelectric ceramic stack to generate high-frequency vibrations, which in turn applies an excitation force to the horn. The horn converts the single excitation into spatial elliptical vibrations, causing the tool bit fixed to the output end to exhibit three-dimensional elliptical-like vibrations in space. This enables ultra-precision machining of complex free-form surfaces.

The application provides a BC component performance detection method and device, electronic equipment and a storage medium. The method comprises the following steps: through the electroluminescent imaging of the BC component by using three electric excitation modes of forward bias, reverse bias and alternating current modulation, a multi-dimensional electroluminescent signal is acquired, and then the performance detection and defect identification of the BC component are realized based on the signal. The application can make up for the defect that the signal information is not comprehensive under the conventional single excitation mode, and effectively improve the detection capability, the pertinence and the accuracy of performance detection.