Conjugate inductance bridge particle detection method, system, equipment and medium

Abstract

The invention relates to the technical field of inductance detection, and discloses a conjugate inductance bridge particle detection method, system and device and a medium, and the method comprises the steps: adjusting a bridge to a balance state when no metal particles flow through a conjugate inductance bridge sensor; metal particles are detected through the conjugate inductance bridge sensor; collecting a detection signal of the conjugate inductance bridge sensor, and compensating the detection signal under different interferences; the processing circuit is used for amplifying, filtering and analyzing the signals and then outputting signal characteristics; and analyzing according to the signal characteristics to obtain a detection result. The method has the advantages of higher sensitivity, lower excitation voltage, better safety and energy efficiency in the detection aspects of particle size, material and the like, higher measurement precision and stability can be kept, and higher recognition precision and accuracy are achieved.

Description

Technical Field

[0001] The present invention relates to the field of inductance detection technology, and in particular to a conjugate inductance bridge particle detection method, system, equipment and medium. Background Art

[0002] Existing metal particle detection technologies mostly rely on inductive sensors, which monitor the presence and characteristics of metal particles through changes in the inductive coil. However, these traditional technologies have certain limitations under certain conditions, which affect detection accuracy and reliability.

[0003] Many existing metal particle detection sensors utilize a dual-coil structure. For example, some sensors can detect larger ferromagnetic and non-ferromagnetic metal particles, but their detection performance is poor for smaller particles. This is due to the limitations of the dual-coil structure, which results in insufficient particle size discrimination, particularly in applications requiring high precision.

[0004] Furthermore, some sensors use a combination of dual induction coils and diode envelope detection for signal conditioning. While this improves signal processing capabilities, it is susceptible to interference from clutter at high excitation frequencies and requires a higher power amplifier circuit. This not only increases power consumption but also reduces the sensor's signal-to-noise ratio and energy efficiency. This low signal-to-noise ratio compromises the sensor's stability and accuracy in complex environments, making it difficult to meet the demands of high-precision detection.

[0005] Furthermore, some inductive metal particle detection devices utilize a three-coil structure and pulse signal post-processing circuitry to obtain information such as the number, size, and concentration of metal particles. However, these devices are unable to effectively suppress or eliminate noise signals caused by environmental fluctuations, thereby affecting the accuracy and stability of measurement results. This noise interference often leads to inconsistent detection results, inaccurate measurement data, and difficulty in providing reliable particle detection in practical applications.

[0006] Therefore, the inductive metal particle detection device in the existing technology has problems such as insufficient detection accuracy for small-sized particles, susceptibility to environmental noise interference, and high power consumption. A new technical solution is urgently needed to solve these defects and improve the accuracy and stability of metal particle detection. Summary of the Invention

[0007] In view of the above-mentioned problems, the present invention is proposed.

[0008] Therefore, the technical problems solved by the present invention are:

[0009] 1. Existing particle sensors based on inductive detection mostly use single coil, double coil, triple coil and other methods. The signal output amplitude is small, and the sensitivity in particle detection such as size and material is insufficient. In addition, the excitation frequency is high and the energy efficiency is low.

[0010] 2. The structure used by existing particle sensors based on inductive detection is difficult to suppress the influence of noise signals generated by environmental factors such as temperature, electromagnetic interference, and vibration on particle detection, which will affect the measurement accuracy and stability.

[0011] 3. When detecting weak particle signals, using a bandpass filter for signal processing requires more operational amplifiers and peripheral resistors, which increases the introduction of noise and reduces the sensor signal-to-noise ratio, which is not conducive to the detection of weak particle signals.

[0012] To solve the above technical problems, the present invention provides the following technical solutions: a conjugate inductor bridge particle detection method, comprising:

[0013] When no metal particles flow through the conjugate inductance bridge sensor, adjust the bridge to a balanced state;

[0014] Detecting metal particles using the conjugate inductance bridge sensor;

[0015] collecting a detection signal of the conjugate inductance bridge sensor and compensating the detection signal under different interferences;

[0016] Using the processing circuit, the signal is amplified, filtered, and analyzed, and the signal characteristics are output;

[0017] After analyzing the signal characteristics, a detection result is obtained.

[0018] As a preferred solution of the conjugate inductance bridge particle detection method of the present invention, wherein: the conjugate inductance bridge sensor includes a channel and four coils of the same specifications;

[0019] The two coils are wound together as a pair, and the two pairs of coils are physically wound on both sides of the channel. When the excitation current is emitted, the magnetic field generated by the four coils has the same direction.

[0020] Let the four coils be marked 、 、 、 , and For a pair, and For a pair;

[0021] In the bridge schematic, each pair of coils is located at a diagonal position, and node a is located at and Node b is located between and Node c is located between and Node d is located between and between;

[0022] Through the signal excitation source, an excitation signal is sent Applied to nodes a and c, and output detection signals at nodes b and d .

[0023] As a preferred embodiment of the conjugate inductance bridge particle detection method of the present invention, the equilibrium state includes: when no particles flow through the sensor, the bridge is leveled so that the output detection signal is 0;

[0024]

[0025] in, Indicates that there is no particle detection signal output after the bridge is leveled; represents the stimulus signal; express The impedance of the bridge arm where the coil is located, Indicates coil The resistance of the coil, i represents the index of the coil; the inductive reactance , j represents the imaginary part, , is the angular velocity, is the excitation frequency; represents the coil inductance;

[0026] Assume that the particle passes through the left and The impedance of the coil and bridge arm changes, breaking the balance condition of the bridge; and The impedance change is the same as ;

[0027]

[0028] in, Represents the output of the detection signal when a particle passes through; Represents the change in coil impedance caused by particles.

[0029] As a preferred solution of the conjugate inductor bridge particle detection method of the present invention, wherein: the different interferences include anti-temperature interference, anti-electromagnetic interference, and anti-vibration interference;

[0030] The anti-temperature interference includes that when the temperature changes, the inductance change value is the same, and the temperature change causes The coil impedance changes to: ;in represents the temperature coefficient, Indicates the temperature change;

[0031] In the output result of the detection signal, Update and compensate the detection signal.

[0032] As a preferred embodiment of the conjugate inductor bridge particle detection method of the present invention, the anti-electromagnetic interference includes: when the external electromagnetic field causes additional impedance changes of all coils , then the bridge arm impedance changes to ;

[0033] The output result of the detection signal is Update is performed to achieve compensation for the detection signal.

[0034] As a preferred embodiment of the conjugate inductor bridge particle detection method of the present invention, the anti-vibration interference includes that when the four coils are exposed to the same stress wave or mechanical wave, the inductor coils will produce impedance changes: , where the impedance change is: , the change in inductive reactance is , and are the proportionality coefficients of resistance and inductive reactance, is the minimum deformation of the coil, then the new bridge arm impedance is ;

[0035] In the output result of the detection signal, Update and compensate the detection signal.

[0036] As a preferred embodiment of the conjugate inductor bridge particle detection method of the present invention, the analysis based on the signal characteristics includes detecting metal abrasive particles using inductance, where the particles passing through the coil will cause the inductance of the coil to change, thereby causing the phase and amplitude of the signal in the detection circuit to change;

[0037] The physical properties of the metal particles are analyzed based on the changes.

[0038] A conjugate inductor bridge particle detection system using the method of the present invention is characterized by:

[0039] An adjustment unit adjusts the bridge to a balanced state when no metal particles flow through the conjugate inductance bridge sensor;

[0040] A detection unit, which detects metal particles using the conjugate inductance bridge sensor;

[0041] a processing unit, which collects detection signals of the conjugate inductance bridge sensor and compensates the detection signals under different interferences;

[0042] The analysis unit uses a processing circuit to amplify, filter, and analyze the signal and outputs the signal characteristics;

[0043] The output unit obtains the detection result after analyzing the signal characteristics.

[0044] A computer device comprises: a memory and a processor; the memory stores a computer program, wherein: when the processor executes the computer program, the steps of any one of the methods of the present invention are implemented.

[0045] A computer-readable storage medium stores a computer program, wherein: when the computer program is executed by a processor, the steps of any one of the methods of the present invention are implemented.

[0046] Beneficial effects of the present invention: The conjugate inductance bridge particle detection method provided by the present invention utilizes a conjugate inductance bridge, whose output signal sensitivity is higher than that of an inductance circuit, and has higher sensitivity in detecting particle size, material, etc., with a lower excitation voltage, and better safety and energy efficiency. By utilizing the compensation principle of the conjugate inductance bridge, sensor noise under adverse conditions such as temperature changes, electromagnetic interference, and vibration can be suppressed or eliminated, thereby maintaining high measurement accuracy and stability. When detecting weak signals, an amplification circuit, a filtering circuit, and a signal analysis circuit are used to ultimately detect the physical properties of the particles, thereby maintaining high recognition accuracy and precision. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0048] Figure 1 This is an overall flow chart of a conjugate inductor bridge particle detection method provided by the first embodiment of the present invention;

[0049] Figure 2 A signal analysis diagram of a conjugate inductor bridge particle detection method provided by the first embodiment of the present invention;

[0050] Figure 3A diagram of an inductor bridge sensing module in a conjugate inductor bridge particle detection method provided by a second embodiment of the present invention;

[0051] Figure 4 A schematic diagram of an inductor coil winding method for detecting particles using a conjugate inductor bridge provided by a second embodiment of the present invention;

[0052] Figure 5 A conjugate inductor bridge particle detection circuit for a conjugate inductor bridge particle detection method is provided in accordance with a second embodiment of the present invention. DETAILED DESCRIPTION

[0053] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the following detailed description of the specific embodiments of the present invention is given in conjunction with the accompanying drawings. It is obvious that the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in this field without creative work should fall within the scope of protection of the present invention.

[0054] Example 1, with reference to Figure 1 、 Figure 2 , as one embodiment of the present invention, provides a conjugate inductor bridge particle detection method, comprising:

[0055] 1. Detection principle: Since metal particles will affect the changes in parameters such as the coil's resistance R and inductance L when passing through the inductor coil, the bridge is balanced when there are no particles, that is, the output value of this sensor is 0 (voltage); when particles pass through the inductor coil, this balance is broken, so the output voltage value will change. The main detection is the change in voltage.

[0056] 2. Detection process: First, the sensor bridge is leveled under particle-free conditions to ensure that the output voltage is 0. Then, particles are sent into the sensor. When the particles pass through the inductor coil, the resistance (R) and inductance (L) parameters of the coil will change, breaking the balance of the bridge, thereby causing the output voltage to change. After amplification and filtering by the signal processing circuit, the oscilloscope collects the waveform of the output signal. The signal is basically in the form of a sine waveform signal, and the phase and amplitude of the sine signal can be obtained. The amplitude is the size of the output voltage, which is displayed as a peak-to-peak value on the oscilloscope and is directly related to the diameter of the particle. The phase is measured by the time delay between the input signal and the output signal, and is related to information such as the material and surface characteristics of the particle.

[0057] 3. Signal Compensation Principle: Traditional coil sensors are susceptible to interference from temperature, electromagnetic interference, and vibration. These interferences can generate noise in the sensor output signal, potentially overwriting or superimposing the signal originally generated by particle detection. However, the conjugate inductor bridge sensor can mitigate the effects of these interference noises through its inherent structural advantages.

[0058] The particle detection principle based on the conjugate inductance bridge is as follows: When particles pass through the conjugate inductance bridge sensor, their magnetization and eddy currents will change the original magnetic field, superimposing a complex domain particle voltage signal on the sensor output signal. By measuring and calculating the amplitude and phase of the voltage signal, the particles can be detected and identified.

[0059] The conjugate inductance bridge sensor consists of one channel and four coils of the same specifications.

[0060] Among them, the two coils are wound together as a pair, and the two pairs of coils are physically wound on both sides of the channel; when the excitation current is emitted, the magnetic field generated by the four coils has the same direction.

[0061] Let the four coils be marked 、 、 、 , and For a pair, and In the bridge schematic, each pair of coils is located at a diagonal position, and node a is located at and Node b is located between and Node c is located between and Node d is located between and Through the signal excitation source, an excitation signal is sent Applied to nodes a and c, and output detection signals at nodes b and d .

[0062] It should be noted that in this winding condition, the instantaneous current direction is as follows Figure 2 As shown, the instantaneous polarity of node a is positive, indicating that the magnetic field directions of all four coils are rightward. This arrangement of coils with the same magnetic field orientation ensures that the alternating magnetic field intensity excited by the particles is as strong as possible. The coil winding direction simply needs to match the direction of the instantaneous excitation signal to ensure that the magnetic field directions of all four coils are the same at all times.

[0063] The coil frame is made of high-temperature resistant material and is injected with UV-curing glue to maintain the shape and position of the coil, reducing changes in the electric or magnetic field caused by environmental factors. The coil is made of multiple thick wires, and the coil on the same side is wound with folded copper wire to make the impedance of the bridge arms at the diagonal position of the bridge as close as possible.

[0064] S1: When no metal particles flow through the conjugate inductance bridge sensor, adjust the bridge to a balanced state.

[0065] When no particles flow through the sensor, adjust the bridge to make the output detection signal is 0.

[0066]

[0067] in, Indicates that there is no particle detection signal output after the bridge is leveled; represents the stimulus signal; express The impedance of the bridge arm where the coil is located, Indicates coil The resistance of the coil, i represents the index of the coil; the inductive reactance , j represents the imaginary part, , is the angular velocity, is the excitation frequency; Indicates the coil inductance; in an ideal state, the diagonal bridge arm impedance is the same. , , then the impedance of the coil when the bridge is balanced is .

[0068] S2: Detecting metal particles by using the conjugate inductance bridge sensor; collecting detection signals of the conjugate inductance bridge sensor, and compensating the detection signals under different interferences.

[0069] When a single particle flows through the sensor, it can only exist on the left side. and Between coils or on the right and Between the coils, place the coils and or coil and Assigning them at the diagonal positions of the bridge can ensure the maximum detection signal. and The impedance of the coil and bridge arm changes, breaking the balance condition of the bridge; and The impedance change is the same as ;

[0070]

[0071] in, Represents the output of the detection signal when a particle passes through; Represents the change in coil impedance caused by particles.

[0072] Due to the sensor arrangement, in the actual process (taking ferromagnetic particles as an example), the following Figure 2 As shown, a particle first passes through the left coil. At this time, the right coil remains unchanged. The magnetization effect disrupts the bridge balance, creating a signal trough. When the particle passes through the right coil, the left coil returns to its original state without particles. The bridge is also unbalanced, resulting in a signal peak. Similarly, when a non-ferromagnetic particle passes, the eddy current effect disrupts the bridge balance, generating an anti-phase sinusoidal signal with a peak followed by a trough.

[0073] By studying the complete sinusoidal signal including peaks and troughs, the wear particle information is obtained by analyzing the signal.

[0074] Furthermore, the inductance value will change with temperature. The conjugate inductor bridge can offset the impact of temperature changes and maintain the stable performance of the circuit. The conjugate inductor can reduce electromagnetic interference in the circuit and also suppress itself from emitting electromagnetic interference. The inductor bridge structure combined with the filter can effectively reduce interference caused by vibration.

[0075] The inductance value will change with the ambient temperature. The conjugate inductor bridge consists of four inductor coils. The coils have basically the same specifications. When the temperature changes, the inductance changes by the same value. When no particles pass through, the bridge is in a balanced state. At this time, the temperature changes, and the coil impedance changes linearly with the temperature. The coil impedance changes to: The output result of the detection signal is Update is performed to achieve compensation for the detection signal. represents the temperature coefficient, Represents the temperature change, and the final output detection signal is:

[0076]

[0077] Due to the structural advantages of the conjugate inductance bridge, the coil impedance of the four bridge arms changes linearly with temperature in the same way. In the initial state of bridge balance, temperature changes will not destroy the original bridge balance, and the detection signal output is always 0, reducing the problem of interference signals caused by temperature changes affecting sensor detection.

[0078] When the particle passes the left and When the coil is in the state of rotation, the impedance of the coil caused by particles changes It will be weakened by the impedance change of the coil caused by temperature, but through the temperature compensation circuit combined with the compensation algorithm, the impedance change caused by the particle itself can be restored, which is convenient for the analysis of the physical characteristics of the particle.

[0079]

[0080] Inductors can be subject to or generate electromagnetic interference in the circuit, which affects the impedance of the coil by affecting the self-inductance and mutual inductance of the coil. The magnetic field directions of the four coils are always the same, and the external magnetic field has the same effect on the four coils of the same specifications and performance. Assuming that the external electromagnetic field causes the additional impedance change of all coils to be Then the bridge arm impedance changes to ; then the detection signal output The impedance of all coils will change due to external electromagnetic field interference. Decided, when When the coils with the same specifications and performance are disturbed by the external electromagnetic field, the additional impedance change value is the same, which makes the detection signal output There will be no change, that is, the bridge always remains balanced:

[0081]

[0082] When the particle passes the left and When the coil is in the state of rotation, the impedance of the coil caused by particles changes Will affect the detection signal output , the interference of external electromagnetic fields causes additional impedance changes of the coil The output will also be affected. The total impedance of the detection voltage denominator increases due to the interference of the external electromagnetic field. Compared with the particle detection output signal during the interference of the external electromagnetic field, the proportion of the change caused by the particles in the total impedance is reduced. However, due to , this effect can be approximately ignored.

[0083]

[0084] Compared to non-bridge particle detection circuits, this approach can reduce sensor output errors in the absence of particles when external electromagnetic interference occurs, and offers higher sensitivity. Due to the differential nature of the bridge, it can effectively resist or significantly reduce common-mode interference, and even in the presence of particles, it can suppress the effects of external electromagnetic interference on detection. By using an inductive bridge structure combined with external electromagnetic field shielding measures and compensation algorithms, the effects of external electromagnetic fields on the coil are suppressed, effectively reducing detection errors caused by external electromagnetic interference.

[0085] The inductor coils are affected by vibration during machine operation. When the four coils are exposed to the same stress wave or mechanical wave, the impedance of the inductor coils will change: , where the impedance change is: , the change in inductive reactance is , and are the proportionality coefficients of resistance and inductive reactance, is the minimum deformation of the coil, then the new bridge arm impedance is ; In the output result of the detection signal, Update and compensate the detection signal.

[0086] Similar to electromagnetic interference, the signal output is detected under the influence of vibration. Mainly by Determined by the bridge arm impedance When the detection signal output There will be no change, that is, the bridge always remains balanced:

[0087]

[0088] When the particle passes the left and When the coil is in the state of rotation, the impedance of the coil caused by particles changes Will affect the detection signal output , the interference of external stress wave or mechanical wave causes additional impedance change of the coil It also affects the output. Extrusion deformation increases the total impedance of the output voltage denominator. Compared with the particle detection output signal without vibration interference, the proportion of the change caused by particles in the total impedance is reduced. , this effect can be approximately ignored.

[0089]

[0090] Compared to non-bridge particle detection circuits, this design can reduce sensor output errors caused by vibration in the absence of particles and offers higher sensitivity. Due to the differential nature of the bridge, it can effectively resist or significantly reduce common-mode interference, and even suppress the effects of vibration on detection in the presence of particles. By combining an inductive bridge structure with seismic isolation measures and a vibration compensation algorithm, the effects of vibration on the coil are suppressed, effectively reducing detection errors caused by stress and mechanical waves.

[0091] S3: Use the processing circuit to amplify, filter, and analyze the signal, and then output the signal characteristics.

[0092] The processing circuitry of the conjugate inductance bridge sensor consists of three parts: a signal amplification circuit, a filtering circuit, and a signal analysis circuit. First, a high-gain amplifier circuit amplifies the weak sensor output signal to a detectable level while ensuring that the amplified signal is not distorted. A filtering circuit removes noise and interference from the signal, improving the signal-to-noise ratio. Amplitude and phase detection circuits measure the amplitude and phase changes of the particle signal for analysis of the particle's physical properties.

[0093] S4: After analyzing the signal characteristics, a detection result is obtained.

[0094] Inductive detection of metal wear particles involves changing the inductance of a coil as it passes through it, which in turn causes changes in the phase and amplitude of the signal in the detection circuit. These changes can be used to analyze the physical characteristics of the metal particles, such as size, shape, and material.

[0095] Specifically:

[0096] 1. The size of the particle, that is, its diameter is positively correlated with the amplitude, that is, the larger the output signal amplitude, the larger the particle diameter

[0097] 2. The ferromagnetism of the particles affects the signal phase. As described in Requirement 2, ferromagnetic particles experience a trough first because the magnetization effect outweighs the eddy current effect. Non-ferromagnetic particles experience a peak first because the eddy current effect outweighs the magnetization effect. High-permeability materials have a more pronounced effect on the phase, leading to a more significant phase shift. Phase shift: Because one sensor output is an excitation signal serving as a reference signal, and the other output is the signal detected by wear particles, the relative phase shift between the two signals is called phase shift.

[0098] 3. The shape of the particles is related to the waveform of the signal, such as sharp, spherical, and long strips. Sharp: The signal has a steep rising edge and a large slope. Spherical: The signal is highly symmetrical, i.e., single-peak symmetry. Long strip: The signal peak lasts for a long time, i.e., the waveform is broadened.

[0099] Example 2, reference Figure 3-5 , which is an embodiment of the present invention, provides a conjugate inductor bridge particle detection method. In order to verify the beneficial effects of the present invention, scientific demonstration is carried out through economic benefit calculation and simulation experiments.

[0100] Particle detection processing circuit embodiment:

[0101] The processing circuit comprises a signal amplification circuit, a filtering circuit, and a signal analysis circuit. By utilizing various processing modules, the detected weak particle signals are effectively amplified, filtered, and analyzed. The weak signal obtained by the conjugate inductance bridge sensor detecting particles is amplified, and a variety of high-gain operational amplifiers are used to amplify the output voltage signal without distortion, bringing the signal to a detectable level. The amplified signal is filtered through various filtering circuits, selectively retaining specific frequencies, reducing environmental noise and interference in the signal, thereby improving the signal-to-noise ratio and retaining the DC component containing information about the voltage amplitude and phase changes caused by the metal particles. The amplitude detection unit determines the peak value or effective value of the signal, providing information on the signal strength. The phase detection unit detects the relative time delay or phase difference between the signals, providing information on the signal phase changes.

[0102] Particle analysis examples:

[0103] When metal particles enter the magnetic field of an inductor coil, the coil's inductance changes due to the magnetization of the metal particles and the eddy current effect. The amount of inductance change is related to the physical properties of the metal particles. For example, the amplitude change of the signal is related to the diameter of the particle; larger particle diameters result in greater amplitude changes. The phase change of the signal can reflect the magnetization properties of the metal particles. Ferromagnetic particles increase the phase change, while diamagnetic particles reduce it.

[0104] Conjugate inductor bridge design, such as Figure 3 、 Figure 4 、 Figure 5 As shown:

[0105] in, Figure 3 This is the module diagram of the inductive bridge sensing module, showing the planar surface and circuit connection model of the conjugate inductive bridge. Figure 4 The actual winding scheme is shown. Figure 5 It is demonstrated in principle. Figure 4 The actual winding method is one of the methods. In fact, as long as the four coils keep the magnetic field direction in the same direction at all times during the excitation process, any winding method can be used. As long as it conforms to the schematic diagram, the magnetic field direction of the four coils can be kept in the same direction, and the schematic diagram can be used to describe it.

[0106] The conjugate inductor bridge function consists of four coils, marked as 、 、 、 , node a is located at and Node b is located between and Node c is located between and Node d is located between and The four coils must meet the following two requirements: 1) the magnetic field generated at any time must be in the same direction to avoid mutual cancellation; 2) the coils physically wound on the same side must be located at diagonal positions in the bridge schematic.

[0107] For example, the left side of the sensor includes and Coil, right side includes and The coil is wound in the same way as the two coils on the left. Applied to nodes a and c, and output detection signals at nodes b and d In this winding situation, the instantaneous current direction is as follows Figure 1 As shown, the instantaneous polarity of node a is positive, indicating that the magnetic field directions of all four coils are rightward. This arrangement of coils with the same magnetic field orientation ensures that the alternating magnetic field intensity excited by the particles is as strong as possible. The coil winding direction simply needs to match the direction of the instantaneous excitation signal to ensure that the magnetic field directions of all four coils are the same at all times.

[0108] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

[0109] Example 3 is the third embodiment of the present invention, which provides a conjugate inductor bridge particle detection system, including:

[0110] The adjustment unit adjusts the conjugate inductance bridge sensor to a balanced state when no metal particles flow through the bridge.

[0111] The detection unit detects metal particles through the conjugate inductance bridge sensor.

[0112] The processing unit collects the detection signal of the conjugate inductance bridge sensor and compensates the detection signal under different interferences.

[0113] The analysis unit uses a processing circuit to amplify, filter and analyze the signal and then outputs the signal characteristics.

[0114] The output unit obtains the detection result after analyzing the signal characteristics.

[0115] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

[0116] Example 4 is the fourth embodiment of the present invention, which differs from the first three embodiments in that:

[0117] If the functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the portion that contributes to the prior art, or the portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage media include various media that can store program code, such as USB flash drives, mobile hard drives, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical disks.

[0118] The logic and / or steps represented in the flowcharts or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing the logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (e.g., a computer-based system, a system including a processor, or other system that can fetch and execute instructions from an instruction execution system, apparatus, or device). For purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport a program for use by, or in conjunction with, an instruction execution system, apparatus, or device.

[0119] More specific examples (a non-exhaustive list) of computer-readable media include the following: an electrical connection with one or more wires (electronic devices), a portable computer disk cartridge (magnetic devices), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, and then editing, interpreting, or processing in another suitable manner as necessary, and then storing it in a computer memory.

[0120] It should be understood that various components of the present invention may be implemented using hardware, software, firmware, or a combination thereof. In the aforementioned embodiments, multiple steps or methods may be implemented using software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented using hardware, as in another embodiment, any one or combination of the following technologies known in the art may be used: a discrete logic circuit having logic gate circuits for implementing logic functions on data signals, an application-specific integrated circuit having suitable combinational logic gate circuits, a programmable gate array (PGA), a field-programmable gate array (FPGA), etc.

Claims

1. A conjugate inductor bridge particle detection method, characterized in that: include: When no metal particles flow through the conjugate inductance bridge sensor, adjust the bridge to a balanced state; Detecting metal particles using the conjugate inductance bridge sensor; collecting a detection signal of the conjugate inductance bridge sensor and compensating the detection signal under different interferences; Using the processing circuit, the signal is amplified, filtered, and analyzed, and the signal characteristics are output; After analyzing the signal characteristics, a detection result is obtained.

2. The conjugate inductor bridge particle detection method according to claim 1, wherein: The conjugate inductance bridge sensor includes one channel and four coils of the same specifications; The two coils are wound together as a pair, and the two pairs of coils are physically wound on both sides of the channel. When the excitation current is emitted, the magnetic field generated by the four coils has the same direction. Let the four coils be marked 、 、 、 , and For a pair, and For a pair; In the bridge schematic, each pair of coils is located at a diagonal position, and node a is located at and Node b is located between and Node c is located between and Between, node d is located and between; Through the signal excitation source, an excitation signal is sent Applied to nodes a and c, and output detection signals at nodes b and d .

3. The conjugate inductor bridge particle detection method according to claim 2, wherein: The equilibrium state includes, when no particles flow through the sensor, leveling the bridge so that the output detection signal is 0; ,in, Indicates that there is no particle detection signal output after the bridge is leveled; represents the stimulus signal; express The impedance of the bridge arm where the coil is located, Indicates coil The resistance of the coil, i represents the index of the coil; the inductive reactance , j represents the imaginary part, , is the angular velocity, is the excitation frequency; represents the coil inductance; Assume that the particle passes through the left and The impedance of the coil and bridge arm changes, breaking the balance condition of the bridge; and The impedance change is the same as ; ,in, Represents the output of the detection signal when a particle passes through; Represents the change in coil impedance caused by particles.

4. The conjugate inductor bridge particle detection method according to claim 3, wherein: The different interferences include anti-temperature interference, anti-electromagnetic interference, and anti-vibration interference; The anti-temperature interference includes that when the temperature changes, the inductance change value is the same, and the temperature change causes The coil impedance changes to: ;in represents the temperature coefficient, Indicates the temperature change; In the output result of the detection signal, Update and compensate the detection signal.

5. The conjugate inductor bridge particle detection method according to claim 4, wherein: The electromagnetic interference immunity includes when external electromagnetic fields cause additional impedance changes of all coils , then the bridge arm impedance changes to ; In the output result of the detection signal, Update and compensate the detection signal.

6. The conjugate inductor bridge particle detection method according to claim 5, wherein: The vibration immunity includes the impedance change of the inductive coils when the four coils are exposed to the same stress wave or mechanical wave: , where the impedance change is: , the change in inductive reactance is , and are the proportionality coefficients of resistance and inductive reactance, is the minimum deformation of the coil, then the new bridge arm impedance is ; In the output result of the detection signal, Update and compensate the detection signal.

7. The conjugate inductor bridge particle detection method according to claim 6, wherein: The analysis based on the signal characteristics includes detecting metal wear particles using inductance, where the particles passing through a coil cause the inductance of the coil to change, thereby causing the phase and amplitude of the signal in the detection circuit to change; The physical properties of the metal particles are analyzed based on the changes.

8. A conjugate inductor bridge particle detection system using the method according to any one of claims 1 to 7, characterized in that: An adjustment unit adjusts the bridge to a balanced state when no metal particles flow through the conjugate inductance bridge sensor; A detection unit, which detects metal particles using the conjugate inductance bridge sensor; a processing unit, which collects detection signals of the conjugate inductance bridge sensor and compensates the detection signals under different interferences; The analysis unit uses a processing circuit to amplify, filter, and analyze the signal and outputs the signal characteristics; The output unit obtains the detection result after analyzing the signal characteristics.

9. A computer device comprising: A memory and a processor; the memory stores a computer program, wherein the processor implements the steps of the method according to any one of claims 1 to 7 when executing the computer program.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

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