37 results about "Magnetic modulation" patented technology

A sensor element for checking the authenticity of a planar data carrier, in particular a banknote, has a spin resonance feature. The sensor element contains a magnetic core having an air gap, into which the planar data carrier can be inserted for authentication and which defines an axial direction extending between the adjoining surfaces of the magnetic core, a polarization device for generating a static magnetic flux in the air gap, a modulation device for generating a time-varying magnetic modulation field in the air gap, and a resonator for exciting the spin resonance feature of the data carrier to be checked. The modulation device is formed by at least one planar coil arranged in the air gap, which planar coil has one or more turns about the axial direction of the air gap in one plane. The disclosure also relates to a checking device having such a sensor element.

A magnetic modulator includes: a magnetic pole piece; a support portion disposed in an axial direction of the magnetic pole piece to rotationally support the magnetic pole piece; and a resin portion that integrates the magnetic pole piece and the support portion, in which at least one of both end surfaces of the magnetic pole piece in the axial direction is exposed.

Magnetic modulation gears (1) having different reduction ratios (R) are suitably lined up. A series of magnetic modulation gears (1) includes a first magnetic modulation gear (1A) and a second magnetic modulation gear (1B). Each of the first magnetic modulation gear (1A) and the second magnetic modulation gear (1B) includes an inner magnetic pole body (41a), an intermediate magnetic pole body (54), and an outer magnetic pole body (12); and the first magnetic modulation gear (1A) and the second magnetic modulation gear (1B) are different from each other in terms of any two of the number (Ni) of inner pole pairs that is the number of pole pairs of the inner magnetic pole body (41a), the number (Np) of magnetic pole pieces that is the number of magnetic poles of the intermediate magnetic pole body (54), and the number (No) of outer pole pairs that is the number of pole pairs of the outer magnetic pole body (12). At least one of the inner magnetic pole body (41a), the intermediate magnetic pole body (54), and the outer magnetic pole body (12) includes a component common to the first magnetic modulation gear (1A) and the second magnetic modulation gear (1B).

The invention discloses a nonlinear quasi bound state terahertz non-magnetic regulation non-reciprocal transmitter and a control method, and belongs to the field of terahertz devices. The nonlinear quasi bound state terahertz non-magnetic regulation non-reciprocal transmitter is formed by periodically arranging and splicing a plurality of unit structures, and each unit structure comprises a silicon carbide substrate and a cylindrical groove gallium arsenide cylinder with the same outer diameter and different inner diameters. The non-linearity of the gallium arsenide material is combined with the asymmetry of the gallium arsenide cylindrical unit structures of the cylindrical grooves with the same outer diameter and different inner diameters, and the non-reciprocal transmission intensity of the terahertz waves is adjusted by changing structural parameters, so that the non-reciprocal transmission regulation and control of the terahertz waves are realized. The nonlinear quasi-bound-state terahertz non-magnetic regulation non-reciprocal transmission device designed by the invention is simple in structure, terahertz wave transmission can be regulated only by changing the incident power of terahertz waves without additionally arranging bias mechanisms such as an external magnetic field, electricity, light, a heat source and the like, and the nonlinear quasi-bound-state terahertz non-magnetic regulation non-reciprocal transmission device is suitable for a future terahertz integrated system.

A gear motor 100 comprises: a motor 20; a magnetic modulation gear 30 having a high-speed rotor (input shaft) 31 to which an output of the motor 20 is inputted, and an output shaft 32 of which the speed is changed with respect to the high-speed rotor 31 through a speed reduction unit; and a control device 40 that controls the output of the motor 20. The control device 40 controls the output of the motor 20 on the basis of torque-phase difference characteristics representing the relationship between an output torque of the output shaft 32 and phase difference information relating to rotational positions of the high-speed rotor 31 and the output shaft 32. Torque-angle characteristics of the output shaft 32 representing the relationship between the torque and the phase of the output shaft 32 are variable.

In a gear motor equipped with a magnetic modulation gear, the torque-angle characteristics are made variable. [Solution] The gear motor 100 includes a motor 20, a magnetic modulation gear 30 having a high-speed rotor (input shaft) 31 to which the output of the motor 20 is input, and an output shaft 32 that is speed-shifted relative to the high-speed rotor 31 through a reduction unit, and a control device 40 that controls the output of the motor 20. The control device 40 controls the output of the motor 20 based on a torque-phase difference characteristic that represents the relationship between phase difference information regarding the rotational position of the high-speed rotor 31 and the output shaft 32 and the output torque of the output shaft 32. The torque-angle characteristic of the output shaft 32, which represents the relationship between the torque and phase of the output shaft 32, is variable.

To suitably line up magnetic modulation gears having different reduction ratios.SOLUTION: The series of magnetic modulating gears 1 comprises a first magnetic modulating gear 1A and a second magnetic modulating gear 1B. The first magnetic modulation gear 1A and the second magnetic modulation gear 1B each include an inner magnetic pole body 41a, an intermediate magnetic pole body 54, and an outer magnetic pole body 12, and any two of the number of inner pole pairs Ni which is the number of pole pairs of the inner magnetic pole body 41a, the number of magnetic pole pieces Np which is the number of magnetic poles of the intermediate magnetic pole body 54, and the number of outer pole pairs No which is the number of pole pairs of the outer magnetic pole body 12 are different from each other. At least one of the inner magnetic pole body 41a, the intermediate magnetic pole body 54 and the outer magnetic pole body 12 includes a component common to the first magnetic modulating gear 1A and the second magnetic modulating gear 1B.SELECTED DRAWING: Figure 3

The present application relates to a kind of wave frequency energy emission devices, the device includes: electromagnetic modulation layer, for modulating preset frequency and power electric signal pulse, and change magnetic field is generated according to the electric signal pulse;Energy conversion layer is arranged in the magnetic field range of the change magnetic field, and the energy conversion layer is used to convert the magnetic field energy of the change magnetic field into vibration energy wave;The energy conversion layer is composed of one or two kinds of strain materials, and the expansion rate and response time of each strain material are different;The vibration energy wave is used to cause the resonance inside target object, to change the state of the target object.The present application utilizes the characteristics that the energy conversion layer generates expansion with the change of electromagnetic field, causes vibration, thereby converts into high-frequency vibration wave, thereby improves the efficiency and effect of energy output.

The embodiment of the invention provides a reversible magnetic thin film material, a magnetism regulation and control method, a preparation method and a memory, the reversible magnetic thin film material is used for reversible magnetism regulation and control, the reversible magnetic thin film material comprises an Sb-Co alloy type thin film, and the atomic ratio of Sb to Co is 3: 1. According to the reversible magnetic thin film material provided by the embodiment of the invention, a highly reversible block metal magnetic switch is realized, the magnetic modulation amplitude of block ferromagnetic metal is improved, the metal shielding effect is broken through to realize volume phase regulation and control, stable operation at room temperature is ensured, and the reversible magnetic thin film material has reversible and non-volatile operation characteristics; therefore, a way is laid for practicability of high-performance magnetic electronic devices.

The invention discloses an electrochemical detection method combining responsive hydrogel and a periodic magnetic modulation system, and belongs to the field of electrochemical detection. The method comprises the following steps: preparing hydrogel with target response characteristics, and embedding a magnetic material with electrochemical activity in the hydrogel; an analysis target acts on the hydrogel to enable the hydrogel to generate phase change, and then the magnetic material is separated; and cleaning and enriching the separated magnetic material, resuspending the magnetic material in an electrolyte required by electrochemical testing, and performing quantitative detection by using a periodic magnetic modulation system to obtain a dynamic electrochemical signal with a frequency characteristic. Through the synergistic effect of target responsive release, magnetic probe enrichment and periodic magnetic regulation and control, the detection sensitivity, selectivity and anti-interference capability are remarkably improved, and the method has wide application prospects in the fields of biomedical detection, environmental monitoring, food safety and the like.

This invention provides an integrated electro-hydraulic actuation device and control method based on magnetic modulation, comprising an integrated suction filter, an integrated oil tank, an integrated spring accumulator, an integrated magnetic speed change mechanism, an integrated motor, an integrated vane pump motor, an integrated valve group, and an integrated double-acting hydraulic cylinder. First, the integrated magnetic speed change mechanism achieves contactless power transmission by matching the speed and torque of the integrated motor and the integrated vane pump motor. Then, the integrated double-acting hydraulic cylinder controls the symmetrically structured cylinder body through the integrated valve group. Hydraulic hoses connect the valve block output oil to both sides of the hydraulic cylinder. Finally, the integrated spring accumulator and pressurized hydraulic oil tank achieve a stable oil supply system for omnidirectional installation. This invention has advantages such as small installation size, high integration, lightweight, high safety, and high control precision, and is applicable to various working conditions, with significant applications in engineering machinery, robotics, aerospace, and other fields.

The application discloses a PGK intelligent control method and system, and belongs to the technical field of precision guidance. The control method comprises the following steps: driving the relative rotation movement of a separate steering ring and a PGK body in the same direction; a controller calculates the absolute rotation speed of the PGK body and the target absolute azimuth angle of the hovering separate steering ring in real time based on a magnetic modulation-rotation speed solving model; based on an eddy current braking torque model, the excitation current of a micro eddy current excitation coil array is adjusted to generate an eddy current braking torque opposite to the rotation direction of the separate steering ring; the eddy current braking torque is controlled to reach dynamic balance with the torque acting on the separate steering ring, so that the separate steering ring is stabilized at the target absolute azimuth angle. The application completely replaces the traditional'motor-reducer' mechanical transmission in an electromagnetic non-contact manner, fundamentally solves the problems of mechanical wear, response delay and poor environmental adaptability, and realizes the structure simplification, performance improvement and high reliability of the PGK control system.

The invention discloses a closed-loop current sensor device based on magnetic modulation. The closed-loop current sensor device comprises a fluxgate winding, an oscillating circuit, a signal conditioning circuit and a push-pull amplifying circuit, the fluxgate winding is respectively connected with the oscillating circuit, the signal conditioning circuit and the push-pull amplifying circuit; the output of the oscillating circuit is connected to the signal conditioning circuit; the signal conditioning circuit outputs a control signal to the push-pull amplification circuit; the output of the push-pull amplification circuit drives the feedback winding to form closed-loop control. Through an innovative magnetic modulation and closed-loop feedback structure, based on fluxgate modulation and closed-loop feedback technology, high-precision detection from direct current to high-frequency current is realized, high precision is realized without depending on a complex MCU algorithm, the influence of temperature on a measurement result is remarkably reduced through a closed-loop zero-flux working mechanism, low temperature drift is realized, and the measurement accuracy is improved. External electromagnetic interference is effectively suppressed through a symmetrical winding structure and closed-loop compensation, and high-interference-resistance current measurement is achieved.

The application provides a high-stability magnetic modulator excitation demodulation method without correction winding, and relates to the technical fields of precise electromagnetic measurement and signal processing. The application adjusts the turn number difference of the excitation windings of two magnetic cores in a double-magnetic-core differential magnetic modulator, and uses a microcontroller to control the positive and negative duty ratio superposition of a low-frequency component of a square wave excitation source to equivalently inject a low-frequency current signal in the magnetic modulator; in combination with digital acquisition and Fourier analysis, a low-frequency voltage sequence and a second harmonic sequence are constructed, and a low-frequency proportional coefficient and an actual direct current proportional coefficient are calculated, so that the online calibration of a direct current measurement value is realized. The application can eliminate the measurement error caused by time and environmental changes without adding a correction winding or a correction power supply, and significantly improves the long-term measurement precision and stability of the magnetic modulator.

The utility model discloses a self-oscillation type alternating-current and direct-current zero-flux current transformer which is characterized in that the alternating-current and direct-current zero-flux current transformer comprises a first direct-current magnetic modulation coil T1, a second direct-current magnetic modulation coil T2, an intermediate-frequency alternating-current coil T3, a high-frequency alternating-current coil T4 and a circuit module; the first direct-current magnetic modulation coil T1 comprises a first direct-current magnetic modulation coil iron core C1, a first direct-current magnetic modulation coil excitation winding W1 and a first section of secondary winding Ws; the second direct-current magnetic modulation coil iron core T2 comprises a second direct-current magnetic modulation coil iron core C2, a second direct-current magnetic modulation coil excitation winding W2 and a second section of secondary winding Ws; the first direct-current magnetic modulation coil excitation winding W1 and the second direct-current magnetic modulation coil excitation winding W2 have the same number of turns and are uniformly and densely wound on the circumferences of the first direct-current magnetic modulation coil iron core C1 and the second direct-current magnetic modulation coil iron core C2 respectively.

The invention discloses a learning system and method based on steady-state visual evoked potential and transcranial magnetic regulation. The learning system comprises a display module which comprises a display interface and a flicker grid, the display interface is used for displaying a learned question, the flicker grid comprises a plurality of option boxes, each option box corresponds to an answer option, and the plurality of option boxes have different flicker frequencies; the electroencephalogram acquisition module is used for acquiring real-time electroencephalogram signals of a user and sending the real-time electroencephalogram signals to the data processing module; the data processing module is connected with the display module and the electroencephalogram acquisition module, and is used for analyzing the electroencephalogram signals acquired by the electroencephalogram acquisition module, obtaining SSVEP characteristic frequency, comparing the SSVEP characteristic frequency with flicker frequency of an option box, selecting answer options watched by a user, and displaying the options on the display module; a control instruction is output to the magnetic stimulation module according to the answering condition of the user; and the magnetic stimulation module is used for applying magnetic stimulation to the user.

The invention belongs to the field of two-dimensional materials, and particularly relates to a magnetic regulation and control technology of transition metal sulfide molybdenum disulfide (MoS2), transition metal manganese (Mn) is taken as an example, the influence of Mn doping on the magnetic performance of a MoS2 film is systematically researched, and the magnetic performance of the MoS2 film can be regulated and enhanced. The quantitative relation between the Mn doping concentration x and the magnetic performance of the Mo1-xMnxS2 film is established through experiments for the first time, it is successfully shown that the magnetic performance of the MoS2 film can be effectively enhanced through Mn doping, the saturation magnetization is 0.0096 emu / mm < 3 > when the saturation magnetization is x-9.7% and is about 3 times that of a sample doped with a small amount of Mn, and the coercive force is about 160 Oe; the magnetic enhanced dual mechanisms of the MoS2 film, namely the local magnetic moment introduced by Mn atoms and enhanced magnetic exchange interaction, are illuminated for the first time. Research on the magnetic performance of the Mo1-xMnxS2 film regulated and controlled by doping of Mn provides reference for expanding the application of the two-dimensional material in spintronics and magnetic storage devices.

The invention belongs to the field of electrolytic aluminum detection, and particularly relates to an industrial electrolytic aluminum detection device and a detection method thereof.The industrial electrolytic aluminum detection device comprises a lifting plate and an anode guide rod, the outer wall of the lifting plate is fixedly connected with a butt-joint curved seat, the butt-joint curved seat is provided with a butt-joint assembly, and the lower side of the butt-joint assembly is provided with a cooling seat; the butt joint assembly comprises a butt joint metal plate, and the butt joint metal plate is arranged on the upper side of the cooling base. According to the industrial electrolytic aluminum detection device and the detection method thereof, magnetic saturation can be effectively avoided through a bidirectional saturation mode of a fluxgate magnetic modulator and pulse excitation current closed-loop control, and it is ensured that a main detection coil can still accurately sense a direct current signal in a strong current environment; meanwhile, the edge computing system carries out filtering and space decoupling processing on the signals, electromagnetic interference in the industrial environment is further eliminated, the device can capture the current change of the single anode guide rod in real time, and an accurate basis is provided for current distribution balance regulation and control of the electrolytic cell.

To provide a method for digital demodulation of all even harmonics of a magnetic modulator based on full phase analysis.SOLUTION: According to the digital demodulation method for all even-order harmonics of a magnetic modulator based on full-phase analysis, when the magnetic modulator is calibrated, standard voltage time sequence data output by the magnetic modulator when a direct current calibration current of a set value flows through the magnetic modulator is obtained, an output voltage sequence of full-phase Fourier analysis is established and pre-processed according to the standard voltage time sequence data, and the pre-processed output voltage sequence of full-phase Fourier analysis is comprehensively analyzed to obtain standard even-order harmonic signals and current conversion coefficients of each order. The present invention uses the full-phase Fourier analysis technology to perform comprehensive pre-processing and comprehensive analysis on the output voltage signal of the air modulator, which greatly reduces the problems of spectrum leakage and phase disturbance, so that the data sampled at different time points are fully utilized, and the signal processing is more accurate.SELECTED DRAWING: Figure 1

A method for digitally demodulating all even-order harmonics of a magnetic modulator based on full phase analysis is provided. [Solution] A digital demodulation method for all even-order harmonics of a magnetic modulator based on full-phase analysis involves calibrating a magnetic modulator by obtaining standard voltage time series data output by the magnetic modulator when a set DC calibration current is passed through the magnetic modulator, establishing and preprocessing an output voltage sequence through full-phase Fourier analysis based on the standard voltage time series data, and comprehensively analyzing the preprocessed output voltage sequence through full-phase Fourier analysis to obtain standard even-order harmonic signals and current conversion coefficients for each order. By using full-phase Fourier analysis technology, the present invention performs comprehensive preprocessing and comprehensive analysis of the output voltage signal of the magnetic modulator, significantly reducing the problems of spectral leakage and phase disturbance, making full use of data sampled at different times and making signal processing more accurate.

The invention discloses a preparation method and application of a high-temperature superconducting material, particularly relates to the technical field of preparation and application of high-temperature superconducting materials, and aims to overcome the core defects of weak grain boundary connection, magnetic flux wriggling and poor mechanical stability in the prior art. According to the innovative preparation method and the application framework, grain directional arrangement and grain boundary strengthening are achieved through a synergistic process of multi-source precursor atmosphere regulation and control calcination and multi-stage pressure hot pressing sintering; the magnetic flux pinning capability is enhanced in combination with the design of a surface cross-scale topological structure; and a modularized magnetic conductive assembly, a strip stress buffer layer and a three-dimensional electromagnetic modulation structure are developed, so that the material outputs stable suspension force in a magnetic suspension system, maintains high current-carrying characteristic in a power cable, realizes wide-frequency-band noise suppression in quantum equipment, and solves the problem of performance degradation in superconducting material application.

A reconfigurable metasurface scattered field regulation and control method and device and a computer program product, and the method comprises the steps: selecting a to-be-optimized load impedance vector according to the type of an electromagnetic modulation element in a reconfigurable metasurface, and inputting the to-be-optimized load impedance vector to a scattered field calculation model to obtain real-time scattered field distribution; wherein the scattered field calculation model is established based on the relationship between the load impedance of the electromagnetic modulation element and the scattered field; based on the difference between the real-time scattering field distribution and the target scattering field distribution, a corresponding convex optimization algorithm is adopted in combination with the type of the electromagnetic modulation element, and an optimized load impedance vector is obtained; inputting the optimized load impedance vector into a scattered field calculation model for iteration to obtain a final load impedance vector; and calculating a lumped element parameter of the electromagnetic modulation element based on the final load impedance vector. According to the method, high-precision regulation and control of the reconfigurable metasurface scattered field are ensured, the optimization efficiency is improved, and data dependence is reduced. And high optimization precision and low calculation overhead are both considered.

The invention provides a cluster type magnetic modulator sharing demodulation, and relates to the technical field of electrical measurement and signal processing. The device consists of a plurality of closed annular magnetic modulators, and is sleeved on a monitoring line to realize non-contact measurement; the voltage excitation unit provides square wave excitation with different fundamental wave frequencies for each magnetic modulator; the signal output unit combines multiple paths of analog outputs, converts the analog outputs into digital signals through the acquisition module, extracts amplitudes at corresponding double frequencies through windowing Fourier analysis, and converts the amplitudes into measurement results of all channels in combination with proportionality coefficients, so that centralized demodulation of multiple channels is realized, the number of hardware is reduced, the cost and the wiring complexity are reduced, and the measurement accuracy is improved. The precision and the sensitivity are ensured; and the system integration degree and the adaptability are improved.

The invention provides a double-layer broadband metamaterial wave absorber covering a C-X-Ku wave band. The double-layer broadband metamaterial wave absorber comprises a copper substrate layer, a first filling layer, a first dielectric layer, a first copper resonance layer, a second filling layer, a second dielectric layer and a second copper resonance layer which are sequentially stacked from bottom to top. The first copper resonance layer comprises a copper square resonance ring, and four edges of the first copper resonance layer are respectively provided with two gaps with fixed intervals. A resistor element is loaded at each gap, and eight resistors are periodically and symmetrically distributed along the ring arms. And the second copper resonance layer comprises four copper right-angle resonance units which are arranged in a central symmetry manner. The two orthogonal arms of each unit are respectively provided with a notch, resistors are loaded at the notches, and the eight resistors are symmetrically distributed on the copper right-angle resonance layer. The invention has the characteristics of high absorption efficiency, wide absorption frequency band and low profile; the method has wide application prospects in the fields of electromagnetic modulation, electromagnetic stealth and the like, and is extremely high in practicability.

The invention relates to a magnetic modulation body capable of easily managing the axial position of a magnetic pole piece. A magnetic modulation body (50) is provided with: a magnetic pole piece (54a); an output shaft part (51) and a bearing support ring (55) which are arranged along the axial direction of the magnetic pole pieces (54a) and are used for rotatably supporting the magnetic pole pieces (54a); and a resin part (56) which integrates the magnetic pole piece (54a) with the output shaft part (51) and the bearing support ring (55). At least one of the two axial end surfaces of the pole piece (54a) is exposed. As a result, the axial position of the end surface (54c) of the exposed pole piece (54a) can be directly measured.

A magnetic modulation gear 1 includes: a magnetic modulation body 50 having a plurality of magnetic pole pieces 54a arranged in a circumferential direction; an inner magnetic pole body 41a having a plurality of inner magnets 41b arranged in the circumferential direction and disposed on an inner diameter side of the magnetic modulation body 50; and an outer magnetic pole body 12 having a plurality of outer magnets 12a arranged in the circumferential direction and disposed on an outer diameter side of the magnetic modulation body 50. The magnetic modulation gear 1 has a harmonic countermeasure structure for suppressing magnetic flux harmonics of the inner magnetic pole body 41a.

The present invention relates to an electromagnetic wave modulation module for modulating electromagnetic waves generated by an electrical signal. According to one embodiment of the present invention, the electromagnetic wave modulation module is provided, the module comprising: an input terminal into which an electrical signal of a specific frequency is input; a metal pattern for modulating, into longitudinal waves, electromagnetic waves generated by the input electrical signal of the specific frequency; an electromagnetic wave adjustment circuit for adjusting the intensity and energy characteristics of the modulated longitudinal waves; and an output terminal for outputting an electrical signal that generates the longitudinal waves modulated and adjusted by the metal pattern and the electromagnetic wave adjustment circuit. According to the present invention, the electromagnetic wave modulation module capable of generating longitudinal waves with a simple configuration by using an electrical signal oscillator manufactured with a semiconductor chip is provided, thereby enabling limitations with respect to conventional mass production, price, marketability, usability, application fields and the like to be solved.

The invention provides a charging pile detection device and detection method, and belongs to the technical field of charging pile detection. The charging pile detection device comprises a dynamic response current sensing module used for acquiring a direct current signal output by a charging pile, converting the direct current signal into a first voltage signal through a magnetic modulation and zero magnetic flux feedback technology, and sending the first voltage signal to a core processing module; the direct-current voltage detection module is used for acquiring a direct-current voltage signal output by the charging pile and sending the direct-current voltage signal to the core processing module; the core processing module is used for receiving and processing the first voltage signal and the direct current voltage signal to obtain a real-time electric energy parameter of the charging pile; a control instruction is generated according to the real-time electric energy parameter and a preset temperature condition, and the control instruction is sent to the liquid cooling module; and the liquid cooling control module is used for controlling and adjusting the heat dissipation power of the charging pile according to the control instruction. The detection efficiency of the charging pile and the accuracy of the identification result can be improved.

To make it easier to control the axial position of the magnetic pole pieces. [Solution] The magnetic modulator 50 comprises a magnetic pole piece 54a, an output shaft portion 51 and a bearing support ring 55 arranged in the axial direction of the magnetic pole piece 54a for rotationally supporting the magnetic pole piece 54a, and a resin portion 56 that integrates the magnetic pole piece 54a with the output shaft portion 51 and the bearing support ring 55. At least one of the axial end faces of the magnetic pole piece 54a is exposed. This allows the axial position of the exposed end face 54c of the magnetic pole piece 54a to be measured directly.

The invention provides a magnetic modulator self-calibration method and system based on low-frequency signal injection, and relates to the technical field of magnetic modulator measurement and calibration. A self-calibration winding is arranged on a magnet, a low-frequency voltage injection module is introduced, a low-frequency current signal with a constant amplitude is injected into a magnetic modulator, digital acquisition, sequence construction, Fourier analysis and correlation operation are combined, a low-frequency signal output value is obtained, an actual low-frequency proportionality coefficient and a direct-current proportionality coefficient are calculated, and the low-frequency current signal output value is calculated. And a self-calibration direct current measurement value is output. The method can effectively eliminate proportionality coefficient drift caused by factors such as working time and environment temperature and humidity, realizes high precision and long-term stability of direct current measurement of the magnetic modulator, and has good engineering applicability and popularization value.