Multidirectional excitation type magnetic multi-parameter sensor, system and method for plane stress measurement

Abstract

The invention provides a multidirectional excitation type magnetic multi-parameter sensor, system and method for plane stress measurement. The sensor comprises a signal excitation assembly and a signal receiving assembly. The signal excitation assembly comprises a plurality of groups of magnetic poles, each group of magnetic poles respectively comprises a U-shaped magnetic yoke and excitation coils respectively wound at two ends of the magnetic yoke, the U-shaped magnetic yokes are coaxially stacked, and two ends of each U-shaped magnetic yoke are respectively in contact with a tested magnetic material; the signal receiving assembly comprises a bracket, two groups of receiving coils wound on the bracket, a three-dimensional Hall sensor array embedded in the bracket and a magnetoacoustic emission receiver arranged at the bottom of the bracket; the signal receiving assembly is arranged below the signal excitation assembly, and the magnetoacoustic emission receiver is in contact with a tested magnetic material. According to the invention, a magnetic Barkhausen signal, a hysteresis loop signal, an eddy current signal, a magnetoacoustic emission signal, a magnetic field harmonic signal, a magnetic leakage signal and an incremental permeability signal in the whole circumferential direction of the surface of the magnetic material can be measured, and a stress value in the whole circumferential direction of the surface of the magnetic material is obtained.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of non-destructive testing, in particular to a multi-directional excitation type magnetic multi-parameter sensor for plane stress measurement, a system and a method. BACKGROUND

[0002] Magnetic material generally refers to a material that can react to a magnetic field in some way. Magnetic components made of magnetic materials are widely used in heavy machinery, automotive electronics, railway transportation and other fields, and the working environment is relatively harsh. Therefore, stress damage is prone to occur in magnetic components, and it is particularly important to detect it.

[0003] Referring to Figure 1 , the plane stress of the magnetic material can be represented as a plane stress tensor, which includes two normal stresses σ x , σ y and two shear stresses τ xy , τ yx . The existing measurement method of electromagnetic stress is to measure the stress in a single direction on the surface of the magnetic material, but the stress in a single direction cannot replace the plane stress tensor of the magnetic material to measure whether the stress on the magnetic material exceeds the required load. Because on the one hand, affected by factors such as material composition, grain size, heat treatment state, fatigue, creep, hardness, etc., the magnetic material may exhibit magnetic anisotropy during use, which can cause differences in electromagnetic signal size in different measurement directions, and further cause errors in stress measurement results in different measurement directions. On the other hand, the simultaneous action of factors such as material composition, stress, grain size, heat treatment state, fatigue, creep, hardness, etc. will also cause changes in the electromagnetic signal. Therefore, using a single type of electromagnetic signal to measure stress can cause a large deviation or even an error. SUMMARY

[0004] To solve the problems in the prior art, the present application provides a stress sensor, a stress measurement system and a stress sensor measurement method, which can measure the magnetic Barkhausen signal, the magnetic hysteresis loop signal, the eddy current signal, the magnetic acoustic emission signal, the magnetic field harmonic signal, the magnetic flux leakage signal and the incremental magnetic permeability signal on the surface of the magnetic material in all directions, and obtain the stress value on the surface of the magnetic material. The measurement result is relatively accurate.

[0005] To solve the above technical problems, the present application provides the following technical solutions:

[0006] In a first aspect, the present application provides a stress sensor, comprising: a signal excitation assembly and a signal receiving assembly; the signal excitation assembly comprises a plurality of magnetic poles, each magnetic pole comprises a U-shaped yoke and an excitation coil wound on both ends of the yoke, respectively, each U-shaped yoke is coaxially stacked, and both ends of each U-shaped yoke contact the measured magnetic material;

[0007] The signal receiving assembly comprises a bracket, two groups of receiving coils wound on the bracket, a three-dimensional Hall sensor array embedded in the bracket, and a magnetoacoustic emission receiver arranged at the bottom of the bracket.

[0008] The signal receiving assembly is arranged below the signal exciting assembly, and the magnetoacoustic emission receiver contacts the measured magnetic material.

[0009] The exciting coil at one end of the magnetic yoke or the group of receiving coils on the bracket is connected to the excitation signal generating device to receive the excitation signal.

[0010] The exciting coil at the other end of the magnetic yoke, the other group of receiving coils on the bracket, the three-dimensional Hall sensor array, or the magnetoacoustic emission receiver is connected to the signal processing device to output the sensing signal to the signal processing device and output to the processing computer after being processed by the signal processing device.

[0011] Further, each of the U-shaped magnetic yokes is coaxially and symmetrically stacked on the measured magnetic material.

[0012] Further, the magnetoacoustic emission receiver comprises a piezoelectric wafer and an acoustic absorption material arranged at the back thereof.

[0013] Further, the magnetoacoustic emission receiver comprises a plurality of groups of coils.

[0014] In a second aspect, the present application provides a stress measurement system, comprising: an excitation signal generating device, a stress sensor, a signal processing device, and a processing computer.

[0015] The excitation signal generating device generates an excitation signal according to an excitation signal generation instruction received from the processing computer and transmits it to the stress sensor.

[0016] The stress sensor senses the excitation signal, generates a sensing signal, and transmits it to the signal processing device.

[0017] The stress sensor comprises a signal exciting assembly and a signal receiving assembly; the signal exciting assembly comprises a plurality of magnetic poles, each magnetic pole comprising a U-shaped magnetic yoke and an exciting coil wound on both ends of the magnetic yoke, respectively, each U-shaped magnetic yoke is coaxially stacked, and both ends of each U-shaped magnetic yoke contact the measured magnetic material.

[0018] The signal receiving assembly comprises a bracket, two groups of receiving coils wound on the bracket, a three-dimensional Hall sensor array embedded in the bracket, and a magnetoacoustic emission receiver arranged at the bottom of the bracket.

[0019] The signal receiving assembly is arranged below the signal exciting assembly, and the magnetoacoustic emission receiver contacts the measured magnetic material.

[0020] The excitation coil on one end of the magnetic yoke or the set of receiving coils on the support is connected to an excitation signal generating device to receive an excitation signal;

[0021] The excitation coil on the other end of the magnetic yoke, the other set of receiving coils on the support, the three-dimensional Hall sensor array or the magnetic acoustic emission receiver is connected to a signal processing device to output a sensing signal to the signal processing device and output to a processing computer after processing by the signal processing device;

[0022] The signal processing device processes the sensing signal and transmits the processed sensing signal to the processing computer;

[0023] The processing computer is configured to extract characteristic values of the sensing signal processed by the signal processing device, and perform linear regression calculation on the characteristic values to obtain a planar stress measurement result.

[0024] Further, the signal excitation device comprises an excitation control system, a signal synthesizer and a power amplifier;

[0025] The excitation control system is configured to control the signal synthesizer to generate an excitation signal according to an excitation signal generation instruction received from the processing computer;

[0026] The power amplifier is configured to amplify the received excitation signal.

[0027] In a third aspect, the present application provides a stress sensing measurement method, comprising:

[0028] The excitation signal generating device generates an excitation signal according to an excitation signal generation instruction received from the processing computer and transmits it to the stress sensor;

[0029] The stress sensor receives the excitation signal to generate a sensing signal and transmits the sensing signal to a signal processing device;

[0030] The signal processing device processes the received sensing signal and transmits the processed sensing signal to the processing computer;

[0031] The processing computer extracts characteristic values of the sensing signal processed by the signal processing device, and performs linear regression calculation on the characteristic values to obtain a planar stress measurement result.

[0032] Further, the sensing signal is a Barkhausen signal, and the stress sensor receives the excitation signal to generate a sensing signal and transmits the sensing signal to a signal processing device, comprising:

[0033] A group of excitation coils in the stress sensor receives the excitation signal;

[0034] A group of receiving coils in the stress sensor senses the excitation signal to obtain a magnetic Barkhausen signal.

[0035] Further, the sensing signal is a Barkhausen signal, the signal processing device is a filter, a multi-channel signal amplifier and a multi-channel signal collector, the signal processing device processes the received sensing signal and transmits the processed sensing signal to the processing computer, including:

[0036] The filter receives the magnetic Barkhausen signal and performs high-pass filtering thereon;

[0037] The multi-channel signal amplifier receives and amplifies the filtered magnetic Barkhausen signal;

[0038] The multi-channel signal collector collects the filtered and amplified magnetic Barkhausen signal and transmits it to the processing computer.

[0039] Further, the sensing signal is a magnetic acoustic emission signal, the stress sensor receives the excitation signal to generate a sensing signal, and transmits the sensing signal to the signal processing device, including:

[0040] A group of excitation coils in the stress sensor receives the excitation signal;

[0041] A magnetic acoustic emission receiver in the stress sensor senses the excitation signal to obtain a magnetic acoustic emission signal.

[0042] Further, the sensing signal is a magnetic acoustic emission signal, the signal processing device is a multi-channel signal amplifier and a multi-channel signal collector, the signal processing device processes the received sensing signal and transmits the processed sensing signal to the processing computer, including:

[0043] The multi-channel signal amplifier receives and amplifies the magnetic acoustic emission signal;

[0044] The multi-channel signal collector collects the amplified magnetic acoustic emission signal and transmits it to the processing computer.

[0045] Further, the sensing signal is an eddy current signal, the stress sensor receives the excitation signal to generate a sensing signal, and transmits the sensing signal to the signal processing device, including:

[0046] A group of receiving coils in the stress sensor receives the excitation signal;

[0047] Another group of receiving coils in the stress sensor senses the excitation signal to obtain the eddy current signal.

[0048] Further, the sensing signal is an eddy current signal, the signal processing device is a lock-in amplifier and a multi-channel signal collector, the stress sensor acquires the sensing signal, and the signal processing device processes the received sensing signal and transmits the processed sensing signal to the processing computer, comprising:

[0049] The lock-in amplifier receives and amplifies the eddy current signal.

[0050] The multi-channel signal collector collects the amplified eddy current signal and transmits it to the processing computer.

[0051] Further, the sensing signal is a hysteresis loop signal, the stress sensor receives the excitation signal to generate a sensing signal, and transmits the sensing signal to the signal processing device, comprising:

[0052] A group of excitation coils in the stress sensor receives the excitation signal.

[0053] A Hall sensor array in the stress sensor senses the excitation signal to obtain the hysteresis loop signal.

[0054] Further, the sensing signal is a hysteresis loop signal, the signal processing device is a filter, a multi-channel signal amplifier, and a multi-channel signal collector, the signal processing device processes the received sensing signal and transmits the processed sensing signal to the processing computer, comprising:

[0055] The filter receives the hysteresis loop signal and filters it.

[0056] The multi-channel signal amplifier receives and amplifies the filtered hysteresis loop signal.

[0057] The multi-channel signal collector collects the filtered and amplified hysteresis loop signal and transmits it to the processing computer.

[0058] Further, the sensing signal is a magnetic field harmonic signal, the stress sensor receives the excitation signal to generate a sensing signal, and transmits the sensing signal to the signal processing device, comprising:

[0059] A group of excitation coils in the stress sensor receives the excitation signal.

[0060] A Hall sensor array in the stress sensor senses the excitation signal to obtain the magnetic field harmonic signal.

[0061] Further, the sensing signal is a magnetic field harmonic signal, and the signal processing device is a filter, a multi-channel signal amplifier, and a multi-channel signal collector, the signal processing device processes the received sensing signal and transmits the processed sensing signal to the processing computer, comprising:

[0062] The filter receives the magnetic field harmonic signal and filters it;

[0063] The multi-channel signal amplifier receives and amplifies the filtered magnetic field harmonic signal;

[0064] The multi-channel signal collector collects the filtered and amplified magnetic field harmonic signal and transmits it to the processing computer.

[0065] Further, the sensing signal is a magnetic leakage signal, and the stress sensor receives the excitation signal to generate a sensing signal and transmits the sensing signal to the signal processing device, comprising:

[0066] A group of excitation coils in the stress sensor receives the excitation signal;

[0067] The Hall sensor array in the stress sensor senses the excitation signal to obtain the magnetic leakage signal.

[0068] Further, the sensing signal is a magnetic leakage signal, and the signal processing device is a filter, a multi-channel signal amplifier, and a multi-channel signal collector, the signal processing device processes the received sensing signal and transmits the processed sensing signal to the processing computer, comprising:

[0069] The filter receives the magnetic leakage signal and filters it;

[0070] The multi-channel signal amplifier receives and amplifies the filtered magnetic leakage signal;

[0071] The multi-channel signal collector collects the filtered and amplified magnetic leakage signal and transmits it to the processing computer.

[0072] Further, the sensing signal is an incremental magnetic permeability signal, and the stress sensor receives the excitation signal to generate a sensing signal and transmits the sensing signal to the signal processing device, comprising:

[0073] A group of excitation coils in the stress sensor receives the low-frequency excitation signal in the excitation signal;

[0074] A group of receiving coils in the stress sensor receives the high-frequency excitation signal in the excitation signal;

[0075] Another group of the stress sensors receives the low-frequency excitation signal and the high-frequency excitation signal to obtain an incremental permeability signal.

[0076] Further, the sensing signal is an incremental permeability signal, the signal processing device is a lock-in amplifier and a multi-channel signal collector, the signal processing device processes the received sensing signal and transmits the processed sensing signal to the processing computer, including:

[0077] The lock-in amplifier receives and amplifies the incremental permeability signal.

[0078] The multi-channel signal collector collects the amplified incremental permeability signal and transmits it to the processing computer.

[0079] To solve the problems in the prior art, the stress sensor, the stress measurement system and the stress sensing measurement method provided by the present application can measure the full circumferential magnetic Barkhausen signal, the magnetic hysteresis loop signal, the eddy current signal, the magnetic acoustic emission signal, the magnetic field harmonic signal, the magnetic flux leakage signal and the incremental permeability signal on the surface of the magnetic material. By extracting characteristic values from the above-mentioned multiple sensing signals, the influence of interference factors is decoupled, the stress value on the full circumferential surface of the magnetic material can be obtained, and the measurement result is relatively accurate. BRIEF DESCRIPTION OF DRAWINGS

[0080] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0081] Figure 1 It is a schematic diagram of the decomposition of the plane stress in the prior art;

[0082] Figure 2 It is one of the structural schematic diagrams of the stress sensor in the embodiments of the present application;

[0083] Figure 3 It is the second structural schematic diagram of the stress sensor in the embodiments of the present application;

[0084] Figure 4 It is the third structural schematic diagram of the stress sensor in the embodiments of the present application;

[0085] Figure 5 It is the fourth structural schematic diagram of the stress sensor in the embodiments of the present application;

[0086] Figure 6 It is a structural schematic diagram of the stress measurement system in the embodiments of the present application;

[0087] Figure 7 Flowchart of the stress measurement method in the embodiment of the present application;

[0088] Figure 8 Flowchart of one of the methods for measuring magnetic Barkhausen signals in the embodiment of the present application;

[0089] Figure 9 Flowchart of another of the methods for measuring magnetic Barkhausen signals in the embodiment of the present application;

[0090] Figure 10 Flowchart of one of the methods for measuring magnetic acoustic emission signals in the embodiment of the present application;

[0091] Figure 11 Flowchart of another of the methods for measuring magnetic acoustic emission signals in the embodiment of the present application;

[0092] Figure 12 Flowchart of one of the methods for measuring eddy current signals in the embodiment of the present application;

[0093] Figure 13 Flowchart of another of the methods for measuring eddy current signals in the embodiment of the present application;

[0094] Figure 14 Flowchart of one of the methods for measuring magnetic hysteresis loop signals in the embodiment of the present application;

[0095] Figure 15 Flowchart of another of the methods for measuring magnetic hysteresis loop signals in the embodiment of the present application;

[0096] Figure 16 Flowchart of one of the methods for measuring magnetic field harmonic signals in the embodiment of the present application;

[0097] Figure 17 Flowchart of another of the methods for measuring magnetic field harmonic signals in the embodiment of the present application;

[0098] Figure 18 Flowchart of one of the methods for measuring magnetic flux leakage signals in the embodiment of the present application;

[0099] Figure 19 Flowchart of another of the methods for measuring magnetic flux leakage signals in the embodiment of the present application;

[0100] Figure 20 Flowchart of one of the methods for measuring incremental magnetic permeability signals in the embodiment of the present application;

[0101] Figure 21 Flowchart of another of the methods for measuring incremental magnetic permeability signals in the embodiment of the present application;

[0102] Figure 22 Schematic diagram of the stress distribution state in the embodiment of the present application;

[0103] Figure 23 A schematic diagram of a y-stress curve in the embodiments of the present application;

[0104] Figure 24 A schematic diagram of an excitation signal received by the coil 7 in the embodiments of the present application;

[0105] Figure 25 A schematic diagram of a magnetic Barkhausen signal in the embodiments of the present application;

[0106] Figure 26 A schematic diagram of a magnetic acoustic emission signal in the embodiments of the present application;

[0107] Figure 27 A schematic diagram of a hysteresis loop in the embodiments of the present application;

[0108] Figure 28 A schematic diagram of an incremental permeability in the embodiments of the present application. DETAILED DESCRIPTION

[0109] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0110] In order to measure the magnetic Barkhausen signal, the hysteresis loop signal, the eddy current signal, the magnetic acoustic emission signal, the magnetic field harmonic signal, the magnetic flux leakage signal and the incremental permeability signal of the full circumferential surface of the magnetic material, and to obtain the stress value of the full circumferential surface of the magnetic material, the present application provides a stress sensor (also referred to as a multi-directional excitation type magnetic multi-parameter sensor for planar stress measurement), as shown in Figure 2 and Figure 3 , which comprises a signal excitation assembly and a signal receiving assembly. The signal excitation assembly comprises a plurality of magnetic poles, each of which comprises a U-shaped yoke 1 and excitation coils 4 and 5 wound on both ends of the yoke 1, respectively. Each U-shaped yoke 1 is coaxially stacked, and the two ends of each U-shaped yoke 1 contact the measured magnetic material.

[0111] The signal receiving assembly comprises a support 8, receiving coils 6 and 7 wound on the support 8, a three-dimensional Hall sensor array 9 embedded in the inside of the support 8, and a magnetic acoustic emission receiver 10 arranged at the bottom of the support 8.

[0112] The signal receiving assembly is arranged below the signal excitation assembly, and the magnetic acoustic emission receiver 10 contacts the measured magnetic material.

[0113] It should be noted that the stress sensor provided in the present application has multiple groups of magnetic poles. Considering that the stress sensor is used to measure the stress of the surface of the magnetic material in the whole circumferential direction, the stress tensor measurement result of the surface of the magnetic material in the whole circumferential direction is obtained, and therefore the more the number of groups of magnetic poles is, the more accurate the measurement result is. Figure 4 and Figure 5 The structural diagrams of the stress sensors with four groups of magnetic poles and six groups of magnetic poles are respectively provided.

[0114] Taking one group of magnetic poles as an example, when the stress sensor provided in the present application is used to measure the stress, referring to Figure 6 , one of the excitation coil 4, the excitation coil 5, the receiving coil 6 or the receiving coil 7 on the bracket 8 on one end of the magnetic yoke 1 is connected to the excitation signal generating device to receive the excitation signal.

[0115] One of the excitation coil 5, the excitation coil 4, the other group of receiving coil 7, the receiving coil 6, the three-dimensional Hall sensor array 9 or the magnetic acoustic emission receiver 10 on the other end of the magnetic yoke 1 is connected to the signal processing device to output the sensing signal to the signal processing device and output to the processing computer after being processed by the signal processing device. Obviously, the above sensing process should be sequentially performed on each magnetic pole of the stress sensor respectively to obtain the stress value of the surface of the magnetic material in the whole circumferential direction.

[0116] It should be noted that taking one group of magnetic poles as an example, if the excitation coil 4 receives the excitation signal, then only the elements other than the excitation coil 4 can be connected to the signal processing device to output the sensing signal to the signal processing device. The principle is similar if the excitation coil 5, the receiving coil 6 or the receiving coil 7 on the bracket 8 receives the excitation signal.

[0117] As can be seen from the above description, the stress sensor provided in the present application can measure the magnetic Barkhausen signal, the magnetic hysteresis loop signal, the eddy current signal, the magnetic acoustic emission signal, the magnetic field harmonic signal, the magnetic flux leakage signal and the incremental permeability signal of the surface of the magnetic material in the whole circumferential direction. By extracting the characteristic value of the above-mentioned multiple sensing signals and decoupling the influence of the interference factors, the stress value of the surface of the magnetic material in the whole circumferential direction can be obtained, and the measurement result is relatively accurate.

[0118] In an embodiment, referring to Figure 2 , Figure 4 and Figure 5 , each U-shaped magnetic yoke 1 is coaxially and symmetrically stacked on the measured magnetic material. The purpose of this is to enable one of the excitation coil 5, the excitation coil 4, the other group of receiving coil 7, the receiving coil 6, the three-dimensional Hall sensor array 9 or the magnetic acoustic emission receiver 10 on the other end of the magnetic yoke 1 to better sense the excitation signal and generate uniform and regular sensing signals in the whole circumferential direction.

[0119] In an embodiment, referring to Figure 3 , the magnetic acoustic emission receiver 10 comprises a piezoelectric wafer and an acoustic absorbing material arranged on the back thereof. The lower surface of the piezoelectric wafer is in contact with the measured component, and the upper surface of the acoustic absorbing material is pasted with the acoustic absorbing material to absorb vibration.

[0120] In an embodiment, referring to Figure 3 , the magnetic acoustic emission receiver 10 is arranged immediately adjacent to the two groups of coils respectively.

[0121] In order to be able to measure the magnetic Barkhausen signal, the magnetic hysteresis loop signal, the eddy current signal, the magnetic acoustic emission signal, the magnetic field harmonic signal, the magnetic flux leakage signal and the incremental permeability signal of the full circumferential surface of the magnetic material, and to obtain the stress value of the full circumferential surface of the magnetic material, referring to Figure 6 , the present application provides a stress measurement system, comprising: an excitation signal generating device, a stress sensor, a signal processing device and a processing computer;

[0122] The excitation signal generating device generates an excitation signal according to the excitation signal generating instruction received from the processing computer, and transmits it to the stress sensor;

[0123] The stress sensor senses the excitation signal, generates a sensing signal and transmits it to the signal processing device;

[0124] The stress sensor comprises a signal excitation assembly and a signal receiving assembly; the signal excitation assembly comprises a plurality of magnetic poles, each magnetic pole comprising a U-shaped yoke 1 and an excitation coil wound on both ends of the yoke 1 respectively, each U-shaped yoke 1 is coaxially stacked, and the two ends of each U-shaped yoke 1 are in contact with the measured magnetic material respectively;

[0125] The signal receiving assembly comprises a support 8, two groups of receiving coils wound on the support 8, a three-dimensional Hall sensor array 9 embedded in the inside of the support 8, and a magnetic acoustic emission receiver 10 arranged at the bottom of the support 8;

[0126] The signal receiving assembly is arranged below the signal excitation assembly, and the magnetic acoustic emission receiver 10 is in contact with the measured magnetic material;

[0127] Among them, the excitation coil on one end of the yoke 1 or one group of receiving coils on the support 8 is connected to the excitation signal generating device to receive the excitation signal;

[0128] The excitation coil on the other end of the yoke 1, the other group of receiving coils on the support 8, the three-dimensional Hall sensor array 9 or the magnetic acoustic emission receiver 10 are connected to the signal processing device to output the sensing signal to the signal processing device and output to the processing computer after being processed by the signal processing device;

[0129] The signal processing device processes the sensing signal and transmits the processed sensing signal to the processing computer;

[0130] The processing computer is configured to extract characteristic values of the sensing signals processed by the signal processing device, and perform linear regression calculation on the characteristic values to obtain the planar stress measurement result.

[0131] It can be understood that the stress measurement system provided by the present application includes two parts, an instrument hardware part and a computer part. The instrument hardware part includes an excitation signal generating device, a stress sensor and a signal processing device.

[0132] When the stress sensor provided by the present application is used to measure the surface stress of a magnetic material, the excitation coil at one end of the magnetic yoke 1 or the group of receiving coils on the support 8 is connected to the excitation signal generating device according to the type of sensing signal required to be measured, so as to receive the excitation signal. For details, see the description of the stress sensor measurement method provided by the present application. Specifically, the type of sensing signal includes magnetic Barkhausen signal, magnetic hysteresis loop signal, eddy current signal, magnetic acoustic emission signal, magnetic field harmonic signal, magnetic flux leakage signal and incremental permeability signal.

[0133] From the above description, it can be understood that the stress measurement system provided by the present application can measure the magnetic Barkhausen signal, the magnetic hysteresis loop signal, the eddy current signal, the magnetic acoustic emission signal, the magnetic field harmonic signal, the magnetic flux leakage signal and the incremental permeability signal around the surface of the magnetic material. By extracting characteristic values of the above-mentioned various sensing signals, the influence of decoupling interference factors can be obtained, and the stress value around the surface of the magnetic material can be obtained, and the measurement result is relatively accurate.

[0134] In an embodiment, the signal excitation device includes an excitation control system, a signal synthesizer and a power amplifier; the excitation control system is configured to control the signal synthesizer to generate the excitation signal according to the excitation signal generation instruction received from the processing computer; and the power amplifier is configured to amplify the received excitation signal.

[0135] In order to measure the magnetic Barkhausen signal, the magnetic hysteresis loop signal, the eddy current signal, the magnetic acoustic emission signal, the magnetic field harmonic signal, the magnetic flux leakage signal and the incremental permeability signal around the surface of the magnetic material, and obtain the stress value around the surface of the magnetic material, see Figure 6 and Figure 7 The present application provides a stress sensor measurement method, which is applied to the stress measurement system provided by the present application, and includes the following steps:

[0136] S701: The excitation signal generating device generates an excitation signal according to the excitation signal generation instruction received from the processing computer, and transmits the excitation signal to the stress sensor;

[0137] It can be understood that the excitation signal generation instruction can be a synthesized sine wave signal with a specified frequency and amplitude.

[0138] S702: The stress sensor receives the excitation signal to generate a sensing signal, and transmits the sensing signal to a signal processing device;

[0139] It can be understood that in this step, the stress sensor can receive the excitation signal through different internal hardware devices, and transmit different sensing signals corresponding to different excitation signals to different signal processing devices. For details, see the description of the following embodiments.

[0140] S703: The signal processing device processes the received sensing signal and transmits the processed sensing signal to a processing computer;

[0141] It can be understood that for different sensing signals, the corresponding signal processing device is different, and the signal processing method is also different. For details, see the description of the following embodiments.

[0142] S704: The processing computer extracts the characteristic value of the sensing signal processed by the signal processing device, and performs linear regression calculation on the characteristic value to obtain a plane stress measurement result.

[0143] It can be understood that the stress sensor is excited by multiple groups of magnetic poles, and when the excitation of one group of magnetic poles is completed, the next group of magnetic poles is switched to excitation, and the magnetic Barkhausen signal, the magnetic hysteresis loop signal, the eddy current signal, the magnetic acoustic emission signal, the magnetic field harmonic signal, the magnetic flux leakage signal and the incremental permeability signal at each angle are obtained one by one. Finally, the processing computer extracts the characteristic value of the sensing signal processed by the signal processing device for each group of magnetic poles, and then performs linear regression calculation on these characteristic values to obtain the entire plane stress measurement result.

[0144] It should be noted that the characteristic values of different sensing signals may not be the same, at least including but not limited to root mean square, peak time, ringing number, envelope, peak value, impedance, phase, coercivity, residual magnetism, area and half peak width.

[0145] Specifically, referring to Figure 22 , let the root mean square of the magnetic Barkhausen signal be x1, the peak time be x2, the ringing number be x3, the envelope be x4, and the peak value be x5; the root mean square of the magnetic acoustic emission signal be x6, the ringing number be x7, the envelope be x8, and the peak value be x9; the impedance of the eddy current be x10, the phase be x11; the coercivity be x12, the residual magnetism be x13; the signal peak value of the incremental permeability be x14, the area be x15, and the half peak width be x16.

[0146] In linear regression calculation, the characteristic value data is modeled using a linear prediction function. The multiple linear regression equation is a regression analysis for modeling the relationship between multiple independent variables and dependent variables, and its mathematical model is as follows:

[0147] y = β0+ β1x1+ β2x2+ … + βp x p +ε(1)

[0148] where y is the dependent variable, x1,…,x p are the independent variables, corresponding to the characteristic values of x1 to x16 described above, β0,…,β p are regression parameters, and ε is an error term.

[0149] By measuring the value of y under different stress states, the mapping relationship between stress and y is obtained, as shown in Figure 23 After fixing the sensor on the calibration specimen, a tension test is performed on the tensile testing machine, the elastic range of the material is divided into several points, and the value of y is measured at each time by using the step loading method, and the y-stress curve is recorded.

[0150] Referring to Figure 22 , it is assumed that the x and y directions are the principal stress directions, and the σ x1′ is measured in a certain direction, it is assumed that the direction is θ1 with σ1, and the σ in the direction θ2 with σ1 is measured. x2′ , the σ in the direction θ3 with σ1 is measured. x3′ At this time, from equation (1), we have:

[0151]

[0152] By solving equation (2), the maximum and minimum stresses σ1 and σ2 can be obtained, and the stress distribution state of the test point on the plane can be obtained by equation (1).

[0153] As can be seen from the above description, the stress sensing measurement method provided by the application can measure the full circumferential magnetic Barkhausen signal, magnetic hysteresis loop signal, eddy current signal, magnetic acoustic emission signal, magnetic field harmonic signal, magnetic flux leakage signal and incremental magnetic permeability signal of the magnetic material surface. By extracting characteristic values from the above-mentioned multiple sensing signals, the influence of interference factors is decoupled, the stress value of the full circumferential surface of the magnetic material can be obtained, and the measurement result is relatively accurate.

[0154] Referring to Figure 8 , when the sensing signal is a Barkhausen signal, the stress sensor receives an excitation signal to generate a sensing signal, and transmits the sensing signal to a signal processing device, which includes:

[0155] S801: A group of excitation coils in the stress sensor receives an excitation signal.

[0156] S802: A group of receiving coils in the stress sensor senses the excitation signal to obtain a magnetic Barkhausen signal.

[0157] It can be understood that the AC power is supplied to one of the groups of excitation coils 4 or 5 of the stress sensor provided in the present application, and the magnetic Barkhausen signal will be received in the coil 7.

[0158] In an embodiment, the AC power with the amplitude of 10 V and the frequency of 50 Hz is supplied to the coil 5 in the stress sensor provided in the present application, and the voltage signal as shown in FIG. 7 will be induced in the coil 7. Figure 3 Figure 24 It can be understood that the AC power is supplied to one of the groups of excitation coils 4 or 5 of the stress sensor provided in the present application, and the magnetic Barkhausen signal will be received in the coil 7.

[0159] Referring to FIG. 8, when the sensing signal is the Barkhausen signal, the signal processing device is a filter, a multi-channel signal amplifier and a multi-channel signal collector, the signal processing device processes the received sensing signal and transmits the processed sensing signal to the processing computer, including: Figure 9 S901: The filter receives the magnetic Barkhausen signal and performs high-pass filtering on the magnetic Barkhausen signal.

[0160] S902: The multi-channel signal amplifier receives and amplifies the filtered magnetic Barkhausen signal.

[0161] S903: The multi-channel signal collector collects the filtered and amplified magnetic Barkhausen signal and transmits the filtered and amplified magnetic Barkhausen signal to the processing computer.

[0162] In an embodiment, the magnetic Barkhausen noise signal as shown in FIG. 9 can be obtained by performing high-pass filtering on the voltage signal induced in the coil 7.

[0163] Figure 25 The processing computer can extract the root mean square, peak time, ringing number, envelope, peak value and other characteristic values of the magnetic Barkhausen signal, and perform linear regression calculation on the characteristic values.

[0164] Referring to FIG. 10, when the sensing signal is the magnetic acoustic emission signal, the stress sensor receives the excitation signal to generate the sensing signal, and transmits the sensing signal to the signal processing device, including: Figure 10 S1001: One of the groups of excitation coils in the stress sensor receives the excitation signal.

[0165] S1002: The magnetic acoustic emission receiver 10 in the stress sensor induces the excitation signal to obtain the magnetic acoustic emission signal.

[0166] It can be understood that the AC power is supplied to one of the groups of excitation coils 4 or 5 of the stress sensor provided in the present application, and the magnetic acoustic emission signal will be received in the coil 7.

[0167] In an embodiment, referring to FIG. 11, the AC power with the amplitude of 10 V and the frequency of 50 Hz is supplied to the coil 5 in the stress sensor provided in the present application, and the magnetic acoustic emission signal will be received in the coil 7.

[0168] Figure 26 ​​​​

[0169] Referring to Figure 11 , the sensing signal is a magnetic acoustic emission signal, the signal processing device is a multi-channel signal amplifier and a multi-channel signal collector, the signal processing device processes the received sensing signal and transmits the processed sensing signal to a processing computer, comprising:

[0170] S1101: The multi-channel signal amplifier receives and amplifies the magnetic acoustic emission signal;

[0171] S1201: The multi-channel signal collector collects the amplified magnetic acoustic emission signal and transmits it to the processing computer.

[0172] In an embodiment, the processing computer can extract the root mean square, ring number, envelope, peak value and other characteristic values of the magnetic acoustic emission signal, and perform linear regression calculation on these characteristic values.

[0173] Referring to Figure 12 , the sensing signal is an eddy current signal, the stress sensor receives the excitation signal to generate the sensing signal and transmits the sensing signal to the signal processing device, comprising:

[0174] S1201: A group of receiving coils in the stress sensor receive the excitation signal;

[0175] S1202: Another group of receiving coils in the stress sensor induct the excitation signal to obtain the eddy current signal.

[0176] In an embodiment, the receiving coil 7 will receive the eddy current signal through a group of magnetic poles or excitation coils 6. For example, an alternating current with an amplitude of 1V and a frequency of 20kHz is passed through the excitation coil 5 as an excitation signal, and the receiving coil 7 inducts a voltage signal, which is the eddy current signal.

[0177] Referring to Figure 13 , the sensing signal is an eddy current signal, the signal processing device is an amplifier and a multi-channel signal collector, the stress sensor acquires the sensing signal, the signal processing device processes the received sensing signal and transmits the processed sensing signal to a processing computer, comprising:

[0178] S1301: The amplifier receives and amplifies the eddy current signal;

[0179] S1302: The multi-channel signal collector collects the amplified eddy current signal and transmits it to the processing computer.

[0180] In an embodiment, the real part of the eddy current signal UR can be obtained by multiplying the above-mentioned eddy current signal and the same frequency sine signal of the excitation signal and then performing low-pass filtering; the imaginary part of the eddy current signal UX can be obtained by multiplying the above-mentioned eddy current signal and the same frequency cosine signal of the excitation signal and then performing low-pass filtering; the eddy current impedance The vortex phase θ = atan(UX / UR), so as to obtain the impedance and phase eigenvalues of the vortex.

[0181] Referring to Figure 14 , the sensing signal is a hysteresis loop signal, the stress sensor receives an excitation signal to generate the sensing signal, and transmits the sensing signal to a signal processing device, comprising:

[0182] S1401: A group of excitation coils in the stress sensor receives an excitation signal;

[0183] S1402: The Hall sensor array in the stress sensor senses the excitation signal to obtain a hysteresis loop signal.

[0184] In an embodiment, by passing alternating current through one of the groups of coils 4 of a group of magnetic poles, the hysteresis loop signal can be obtained by measuring the excitation current in one of the groups of coils 4 on the current excitation magnetic pole and the induced voltage of the other group of coils 5; or the excitation strength H can be measured by the Hall sensor array 9, and the hysteresis loop signal can be obtained by measuring the induced voltage in the other group of coils 5 on the current excitation magnetic pole.

[0185] Referring to Figure 15 , the sensing signal is a hysteresis loop signal, the signal processing device is a filter, a multi-channel signal amplifier and a multi-channel signal collector, the signal processing device processes the received sensing signal and transmits the processed sensing signal to a processing computer, comprising:

[0186] S1501: The filter receives the hysteresis loop signal and filters it;

[0187] S1502: The multi-channel signal amplifier receives and amplifies the filtered hysteresis loop signal;

[0188] S1503: The multi-channel signal collector collects the filtered and amplified hysteresis loop signal and transmits it to the processing computer.

[0189] In an embodiment, referring to Figure 27 , in an embodiment, an alternating current with a size of 1A and a frequency of 30Hz is passed through the excitation coil 5, the excitation coil 4 can sense a voltage signal U, and the integral of the sensed voltage signal U can obtain M (magnetic induction strength).

[0190] The excitation strength H = c x I, where c is the ratio between the excitation current and the excitation strength, and for the same sensor, c is a constant, and I is the current. Taking H as the horizontal axis and M as the vertical axis, a hysteresis loop as shown in Figure 27 can be obtained.

[0191] In another embodiment, the H1 directly measured by the Hall sensor array 9 can be taken as the horizontal axis and the M as the vertical axis to obtain the hysteresis loop as shown in FIG. 6. Figure 27 The characteristic values of the hysteresis loop can be the coercive force, remanence, etc.

[0192] The characteristic values of the hysteresis loop can be the coercive force, remanence, etc.

[0193] Referring to FIG. 5, the sensing signal is a magnetic field harmonic signal, the stress sensor receives the excitation signal to generate the sensing signal, and transmits the sensing signal to the signal processing device, which includes: Figure 16

[0194] S1601: A group of excitation coils in the stress sensor receives the excitation signal.

[0195] S1602: The Hall sensor array in the stress sensor senses the excitation signal to obtain a magnetic field harmonic signal.

[0196] In one embodiment, an alternating current is passed through a group of coils of a group of magnetic poles, and the three-dimensional Hall sensor array 9 can receive the magnetic field harmonic signal.

[0197] Specifically, in one embodiment, an alternating current with an amplitude of 5V and a frequency of 60Hz is passed through the excitation coil 5 as the excitation signal, and the three-dimensional Hall sensor array 9 can measure the signal as H2.

[0198] Referring to FIG. 5, the sensing signal is a magnetic field harmonic signal, the stress sensor receives the excitation signal to generate the sensing signal, and transmits the sensing signal to the signal processing device, which includes: Figure 17

[0199] S1701: The filter receives the magnetic field harmonic signal and filters it.

[0200] S1702: The multi-channel signal amplifier receives and amplifies the filtered magnetic field harmonic signal.

[0201] S1703: The multi-channel signal collector collects the filtered and amplified magnetic field harmonic signal and transmits it to the processing computer.

[0202] In one embodiment, the amplitude graph of each frequency component can be obtained by performing Fourier transform on the H2 signal, and the n times frequency signal (n is an odd number, n>2) of the excitation signal can be extracted from the amplitude graph of each frequency component. The characteristic values such as the amplitude of the excitation signal and the amplitude of the n times frequency signal (n is an odd number, n>2) can be extracted.

[0203] Referring to FIG. 6, the sensing signal is a magnetic leakage signal, the stress sensor receives the excitation signal to generate the sensing signal, and transmits the sensing signal to the signal processing device, which includes: Figure 18 ​​​

[0204] S1801: A set of excitation coils in the stress sensor receives the excitation signal;

[0205] S1802: A set of Hall sensors in the stress sensor senses the excitation signal to obtain the leakage magnetic signal.

[0206] In an embodiment, a set of coils 4 of a set of magnetic poles is passed through direct current, and the leakage magnetic signal can be received in the three-dimensional Hall sensor array 9. When the sensor moves, whether there is a defect in the measured part can be determined by the change of the leakage magnetic signal.

[0207] Referring to Figure 19 , the sensing signal is a leakage magnetic signal, the signal processing device is a filter, a multi-channel signal amplifier and a multi-channel signal collector, the signal processing device processes the received sensing signal and transmits the processed sensing signal to the processing computer, comprising:

[0208] S1901: The filter receives the leakage magnetic signal and filters it;

[0209] S1902: The multi-channel signal amplifier receives and amplifies the filtered leakage magnetic signal;

[0210] S1903: The multi-channel signal collector collects the filtered and amplified leakage magnetic signal and transmits it to the processing computer.

[0211] Referring to Figure 20 , the sensing signal is an incremental permeability signal, the stress sensor receives the excitation signal to generate the sensing signal, and transmits the sensing signal to the signal processing device, comprising:

[0212] S2001: A set of excitation coils in the stress sensor receives the low-frequency excitation signal in the excitation signal;

[0213] S2002: A set of receiving coils in the stress sensor receives the high-frequency excitation signal in the excitation signal;

[0214] S2003: Another set of receiving coils in the stress sensor senses the low-frequency excitation signal and the high-frequency excitation signal to obtain the incremental permeability signal.

[0215] In an embodiment, a set of coils of a set of magnetic poles is passed through low-frequency alternating current, and another set of coils of the set of magnetic poles is passed through high-frequency alternating current, and the incremental permeability signal will be obtained.

[0216] In an embodiment, low-frequency alternating current U1 with an amplitude of 10V and a frequency of 30Hz is passed through the excitation coil 5, and high-frequency alternating current with an amplitude of 2V and a frequency of 20kHz is passed through the excitation coil 4. At this time, the output signal amplitude U2 and the output phase signal θ1 are output after phase-locked amplification of the output end of the receiving coil 7. The locking frequency of the phase-locked amplification is the frequency of the high-frequency alternating current. As shown in the incremental permeability graph of FIG. 8, the low-frequency alternating current U1 is taken as the horizontal axis, and the phase-locked amplification output U2 is taken as the vertical axis. Figure 28

[0217] The signal peak value, area, and half-peak width can be extracted from the incremental permeability.

[0218] Referring to FIG. 9, the sensing signal is an incremental permeability signal, the signal processing device is a phase-locked amplifier and a multi-channel signal collector, the signal processing device processes the received sensing signal and transmits the processed sensing signal to a processing computer, and the method comprises the following steps. Figure 21

[0219] S2101: The phase-locked amplifier receives and amplifies the incremental permeability signal.

[0220] S2102: The multi-channel signal collector collects the amplified incremental permeability signal and transmits it to the processing computer.

[0221] Each of the embodiments in the specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other. Each embodiment mainly describes the difference from other embodiments. In particular, for the embodiment of the device implementation method, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant part can be referred to the part of the method embodiment.

[0222] The above describes specific embodiments of the specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims can be performed in an order different than the order in the embodiments and still achieve the desired result. In addition, the processes depicted in the figures do not necessarily require the particular order shown or sequential order to achieve the desired results. In certain implementations, multitasking and parallel processing can be advantageous or possible.

[0223] ​​While the embodiments in this specification provide the method operation steps as described in the embodiments or flowcharts, more or fewer operation steps may be included based on conventional or non-inventive means. The order of steps listed in the embodiments is merely one possible order of execution among many steps and does not represent the only possible order of execution. The terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, product, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, product, or apparatus. Without further limitations, the presence of other identical or equivalent elements in a process, method, product, or apparatus that includes said elements is not excluded.

[0224] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, system embodiments are basically similar to method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments. In the description of this specification, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments in this specification. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0225] The above description is merely an embodiment of the embodiments in this specification and is not intended to limit the embodiments of this specification. For those skilled in the art, various modifications and variations can be made to the embodiments of this specification. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of the embodiments of this specification should be included within the scope of the claims of the embodiments of this specification.

Claims

1. A multi-directional excitation type magnetic multi-parameter sensor for planar stress measurement, characterized by, The application relates to a multi-directional excitation type magnetic multi-parameter sensor for plane stress measurement. The signal excitation assembly comprises a plurality of magnetic poles, each of which comprises a U-shaped yoke and excitation coils wound on both ends of the yoke, the U-shaped yokes are coaxially stacked, and the two ends of each U-shaped yoke contact the measured magnetic material. The signal receiving assembly comprises a support, two groups of receiving coils wound on the support, a three-dimensional Hall sensor array embedded in the support, and a magnetoacoustic emission receiver arranged at the bottom of the support. The signal receiving assembly is arranged below the signal excitation assembly, and the magnetoacoustic emission receiver contacts the measured magnetic material. The excitation coil on one end of the yoke or one group of receiving coils on the support is connected to the excitation signal generating device to receive the excitation signal. The excitation coil on the other end of the yoke, the other group of receiving coils on the support, the three-dimensional Hall sensor array or the magnetoacoustic emission receiver is connected to the signal processing device to output the sensing signal to the signal processing device and output to the processing computer after processing by the signal processing device.

2. The multi-axis magnetometer sensor for planar stress measurement according to claim 1, characterized by, The U-shaped yokes are coaxially and symmetrically stacked on the measured magnetic material.

3. The multi-axis magnetization type magnetic multi-parameter sensor for planar stress measurement according to claim 1, characterized by, The magnetoacoustic emission receiver comprises a piezoelectric wafer and sound-absorbing material arranged on the back thereof.

4. The multi-axis magnetization type magnetic multi-parameter sensor for flat stress measurement according to claim 1, characterized by, The magnetoacoustic emission receiver comprises a plurality of coils.

5. A stress measurement system characterized by, The application relates to a multi-directional excitation type magnetic multi-parameter sensor for plane stress measurement. The excitation signal generating device generates an excitation signal according to the excitation signal generating instruction received from the processing computer and transmits the excitation signal to the multi-directional excitation type magnetic multi-parameter sensor for plane stress measurement. The multi-directional excitation type magnetic multi-parameter sensor for plane stress measurement senses the excitation signal, generates a sensing signal and transmits the sensing signal to the signal processing device. The multi-directional excitation type magnetic multi-parameter sensor for plane stress measurement comprises a signal excitation assembly and a signal receiving assembly. The signal receiving assembly comprises a support, two groups of receiving coils wound on the support, a three-dimensional Hall sensor array embedded in the support and a magnetoacoustic emission receiver arranged at the bottom of the support. The signal receiving assembly is arranged below the signal excitation assembly, and the magnetoacoustic emission receiver contacts the measured magnetic material. The excitation coil on one end of the yoke or one group of receiving coils on the support is connected to the excitation signal generating device to receive the excitation signal. The excitation coil on the other end of the yoke, the other group of receiving coils on the support, the three-dimensional Hall sensor array or the magnetoacoustic emission receiver is connected to the signal processing device to output the sensing signal to the signal processing device and output to the processing computer after processing by the signal processing device. The signal processing device processes the sensing signal and transmits the processed sensing signal to the processing computer. ​ The processing computer is configured to extract characteristic values of the sensing signals processed by the signal processing device, and perform linear regression calculation on the characteristic values to obtain the planar stress measurement result.

6. The stress measurement system of claim 5, wherein, The signal excitation device comprises an excitation control system, a signal synthesizer and a power amplifier. The excitation control system is configured to control the signal synthesizer to generate the excitation signal according to the excitation signal generation instruction received from the processing computer. The power amplifier is configured to amplify the received excitation signal.

7. A stress sensing method applied to the stress measurement system of claim 5 or 6, characterized in that, The excitation signal generation device generates the excitation signal according to the excitation signal generation instruction received from the processing computer, and transmits the excitation signal to the planar stress measurement multi-direction excitation magnetic multi-parameter sensor. The planar stress measurement multi-direction excitation magnetic multi-parameter sensor receives the excitation signal to generate a sensing signal, and transmits the sensing signal to the signal processing device. The signal processing device processes the received sensing signal and transmits the processed sensing signal to the processing computer. The processing computer extracts characteristic values of the sensing signals processed by the signal processing device, and performs linear regression calculation on the characteristic values to obtain the planar stress measurement result. The sensing signal is a magnetic Barkhausen signal, and the planar stress measurement multi-direction excitation magnetic multi-parameter sensor receives the excitation signal to generate a sensing signal, and transmits the sensing signal to the signal processing device, comprising:

8. The stress sensing method according to claim 7, characterized in that, A group of excitation coils in the planar stress measurement multi-direction excitation magnetic multi-parameter sensor receives the excitation signal. A group of receiving coils in the planar stress measurement multi-direction excitation magnetic multi-parameter sensor senses the excitation signal to obtain the magnetic Barkhausen signal. The sensing signal is a magnetic acoustic emission signal, and the planar stress measurement multi-direction excitation magnetic multi-parameter sensor receives the excitation signal to generate a sensing signal, and transmits the sensing signal to the signal processing device, comprising:

9. The stress sensing method according to claim 8, characterized in that, A group of excitation coils in the planar stress measurement multi-direction excitation magnetic multi-parameter sensor receives the excitation signal. A magnetic acoustic emission receiver in the planar stress measurement multi-direction excitation magnetic multi-parameter sensor senses the excitation signal to obtain the magnetic acoustic emission signal. The sensing signal is a magnetic acoustic emission signal, and the signal processing device comprises a multi-channel signal amplifier and a multi-channel signal collector, and the signal processing device processes the received sensing signal and transmits the processed sensing signal to the processing computer, comprising: The multi-channel signal amplifier receives and amplifies the magnetic acoustic emission signal.

10. The stress sensing method of claim 7, wherein, The multi-channel signal collector collects the filtered and amplified magnetic acoustic emission signal and transmits the signal to the processing computer. ​ ​ 11. The stress sensing method according to claim 10, characterized in that, ​ ​ The multi-channel signal collector collects the amplified magnetoacoustic emission signals and transmits them to the processing computer.

12. The stress sensing method of claim 7, wherein, The sensing signal is an eddy current signal, the multi-directional excitation type magnetic multi-parameter sensor for plane stress measurement receives the excitation signal to generate a sensing signal, and transmits the sensing signal to a signal processing device, including: A group of receiving coils in the multi-directional excitation type magnetic multi-parameter sensor for plane stress measurement receives the excitation signal; Another group of receiving coils in the multi-directional excitation type magnetic multi-parameter sensor for plane stress measurement induces the excitation signal to obtain the eddy current signal.

13. The stress sensing method according to claim 12, characterized in that, The sensing signal is an eddy current signal, the signal processing device is a lock-in amplifier and a multi-channel signal collector, the multi-directional excitation type magnetic multi-parameter sensor for plane stress measurement acquires a sensing signal, the signal processing device processes the received sensing signal and transmits the processed sensing signal to the processing computer, including: The lock-in amplifier receives and amplifies the eddy current signal; The multi-channel signal collector collects the amplified eddy current signal and transmits it to the processing computer.

14. The stress sensing method of claim 7, wherein, The sensing signal is a hysteresis loop signal, the multi-directional excitation type magnetic multi-parameter sensor for plane stress measurement receives the excitation signal to generate a sensing signal, and transmits the sensing signal to a signal processing device, including: A group of excitation coils in the multi-directional excitation type magnetic multi-parameter sensor for plane stress measurement receives the excitation signal; A Hall sensor array in the multi-directional excitation type magnetic multi-parameter sensor for plane stress measurement induces the excitation signal to obtain the hysteresis loop signal.

15. The stress sensing method according to claim 14, characterized in that, The sensing signal is a hysteresis loop signal, the signal processing device is a filter, a multi-channel signal amplifier and a multi-channel signal collector, the signal processing device processes the received sensing signal and transmits the processed sensing signal to the processing computer, including: The filter receives the hysteresis loop signal and filters it; The multi-channel signal amplifier receives and amplifies the filtered hysteresis loop signal; The multi-channel signal collector collects the filtered and amplified hysteresis loop signal and transmits it to the processing computer.

16. The stress measurement method of claim 7, wherein, The sensing signal is a magnetic field harmonic signal, the multi-directional excitation type magnetic multi-parameter sensor for plane stress measurement receives the excitation signal to generate a sensing signal, and transmits the sensing signal to a signal processing device, including: A group of excitation coils in the multi-directional excitation type magnetic multi-parameter sensor for plane stress measurement receives the excitation signal; A Hall sensor array in the multi-directional excitation type magnetic multi-parameter sensor for plane stress measurement induces the excitation signal to obtain the magnetic field harmonic signal.

17. The stress sensing method according to claim 16, wherein, The sensing signal is a magnetic field harmonic signal, the signal processing device is a filter, a multi-channel signal amplifier and a multi-channel signal collector, the signal processing device processes the received sensing signal and transmits the processed sensing signal to the processing computer, including: The filter receives the magnetic field harmonic signal and filters it; The multi-channel signal amplifier receives and amplifies the filtered magnetic field harmonic signal; The multi-channel signal collector collects the filtered and amplified magnetic field harmonic signal and transmits it to the processing computer. The multi-channel signal collector collects the filtered and amplified magnetic field harmonic signals and transmits them to the processing computer.

18. The stress measurement method of claim 7, wherein, The sensing signal is a magnetic leakage signal, the multi-directional excitation magnetic multi-parameter sensor for plane stress measurement receives the excitation signal to generate a sensing signal, and transmits the sensing signal to a signal processing device, including: A group of excitation coils in the multi-directional excitation magnetic multi-parameter sensor for plane stress measurement receives the excitation signal; A Hall sensor array in the multi-directional excitation magnetic multi-parameter sensor for plane stress measurement senses the excitation signal to obtain the magnetic leakage signal.

19. The stress sensing method according to claim 18, wherein, The sensing signal is a magnetic leakage signal, the signal processing device is a filter, a multi-channel signal amplifier, and a multi-channel signal collector, the signal processing device processes the received sensing signal and transmits the processed sensing signal to the processing computer, including: The filter receives the magnetic leakage signal and filters it; The multi-channel signal amplifier receives and amplifies the filtered magnetic leakage signal; The multi-channel signal collector collects the filtered and amplified magnetic leakage signal and transmits it to the processing computer.

20. The stress measurement method of claim 7, wherein, The sensing signal is an incremental magnetic permeability signal, the multi-directional excitation magnetic multi-parameter sensor for plane stress measurement receives the excitation signal to generate a sensing signal, and transmits the sensing signal to a signal processing device, including: A group of excitation coils in the multi-directional excitation magnetic multi-parameter sensor for plane stress measurement receives low-frequency excitation signals in the excitation signal; A group of receiving coils in the multi-directional excitation magnetic multi-parameter sensor for plane stress measurement receives high-frequency excitation signals in the excitation signal; Another group of receiving coils in the multi-directional excitation magnetic multi-parameter sensor for plane stress measurement senses the low-frequency excitation signal and the high-frequency excitation signal to obtain an incremental magnetic permeability signal.

21. The stress sensing method of claim 20, wherein, The sensing signal is an incremental magnetic permeability signal, the signal processing device is a lock-in amplifier and a multi-channel signal collector, the signal processing device processes the received sensing signal and transmits the processed sensing signal to the processing computer, including: The lock-in amplifier receives and amplifies the incremental magnetic permeability signal; The multi-channel signal collector collects the amplified incremental magnetic permeability signal and transmits it to the processing computer.

Images