A slurry state detection probe, device and method based on pulsed eddy current

Abstract

The present invention discloses a slurry state detection probe, device and method based on pulsed eddy current. The slurry state detection probe includes: a coil shaft, a pickup coil, and an exciting coil. A pulsed excitation signal is applied through the exciting coil to generate a vortex inside the slurry container to be detected, and the pickup coil generates a corresponding detection voltage signal according to the vortex. The device includes: a control module, a data processing module and an operation module. By using the above slurry state detection probe to detect the slurry state, combining the pulsed eddy current technology with the slurry state detection, the driving of the slurry state detection probe and subsequent data processing and state judgment are realized through module integration, which can improve the detection efficiency and reduce the work of manual data processing at the same time, and the operation is simple. Moreover, the slurry state detection probe does not need to extend into the detection container, is not affected by the particle size in the slurry during detection, can realize non-contact measurement, and can further improve the detection accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of pulsed eddy current, and particularly to a slurry state detection probe, method and device based on pulsed eddy current. Background Art

[0002] Multilayer Ceramic Capacitors (MLCC) are one of the most widely used passive electronic components in the modern electronics industry. In the tape casting process, the control of the performance of ceramic slurry is of utmost importance, and the key index for evaluating the slurry performance is its uniformity. Poorly uniform slurry will inevitably cause density differences at different positions of the green body after tape casting, which will not only lead to inconsistent shrinkage in all directions during drying, causing the green body to deform or even crack, but also result in sintering shrinkage differences of the green body, making the density distribution of the sintered ceramic uneven and damaging the device performance.

[0003] Currently, the methods for studying the uniformity of ceramic slurry include sedimentation observation method, ultrasonic detection method, rheological test method, multiple light scattering method, γ-ray test method, etc. The ultrasonic detection method requires installing multiple ultrasonic transducers and related hardware circuits on the ceramic slurry volume container, and ultrasonic coupling agent needs to be applied on the contact surface between the ultrasonic transducer probe and the ceramic slurry volume container; while the rheological test method requires stirring the slurry before detection, and multiple parameters such as apparent viscosity, plastic viscosity, and shear force need to be calculated during the detection process, and operations such as filtration loss measurement, rotation speed conversion, and hysteresis loop plotting also need to be carried out. The above methods can obtain information on the uniformity of ceramic slurry to a certain extent, but there is a problem in common: the operation steps are complex and cumbersome, and it is difficult to obtain a numerical expression of the slurry uniformity as a whole while ensuring accurate measurement accuracy and meeting timeliness, and the evaluation cost is expensive. Summary of the Invention

[0004] The present application provides a slurry state detection probe, device and method based on pulsed eddy current, which simplifies the operation of slurry state detection while improving the accuracy of slurry state detection.

[0005] In a first aspect, the present application provides a slurry state detection probe based on pulsed eddy current, comprising:

[0006] A coil shaft, a pick-up coil and an excitation coil;

[0007] The pick-up coil is wound around the upper end of the shaft body of the coil shaft; wherein, the excitation coil is used to apply a pulsed excitation signal to generate eddy current inside the slurry container to be detected;

[0008] The excitation coil is wound around the lower end of the shaft body of the coil shaft; wherein, the pick-up coil is used to generate a corresponding detection voltage signal according to the eddy current;

[0009] There is a preset distance interval between the upper end and the lower end of the shaft body.

[0010] In this way, for the slurry state detection probe based on eddy current detection technology, a pulsed excitation signal is applied through the excitation coil, and this pulsed excitation signal will vary with the slurry density and particle precipitation inside the slurry container to be detected. When the detection slurry inside the slurry container to be detected receives this pulsed excitation signal, an eddy current phenomenon will occur, generating a rapidly decaying pulsed magnetic field that propagates in the slurry container to be detected. The pickup coil is used to generate a corresponding voltage signal that changes with the slurry state according to the magnetic field generated by the pulsed eddy current, realizing the detection of the state of the slurry to be detected. At the same time, there is also a preset distance interval between the upper and lower ends of the shaft body, which can prevent the pickup coil and the excitation coil wound around the upper and lower ends of the shaft body from overlapping and affecting the detection effect.

[0011] In one implementation, an insulating layer is nested at the shaft body corresponding to the interval for a slurry detection probe based on pulsed eddy current.

[0012] In this way, by further nesting an insulating layer at the shaft body at the interval, not only can the overlapping of the pickup coil and the excitation coil be prevented, but also the interference of the current between the two coils can be avoided, reducing the interference of environmental factors on the slurry state detection. The pickup coil can generate a more accurate detection voltage signal according to the eddy current, further improving the detection accuracy of the slurry state detection probe.

[0013] In a second aspect, the present application also provides a slurry state detection device based on pulsed eddy current, including:

[0014] A control module, a data processing module, an operation module, and the above-mentioned slurry state detection probe;

[0015] The control module is used to drive the slurry state detection probe;

[0016] The slurry state detection probe is used to control the generation of eddy current inside the slurry container to be detected, generate a detection voltage signal according to the eddy current and send it to the data processing module; wherein, the slurry state detection probe is located at a preset distance directly above the slurry container to be detected;

[0017] The data processing module is used to perform digital-to-analog conversion on the detection voltage signal and output the converted data;

[0018] The operation module is used to perform operations on the converted data according to a preset algorithm and output the state of the slurry to be detected.

[0019] In this way, by using a slurry state detection probe based on pulsed eddy current technology to detect the slurry to be detected, a corresponding detection voltage signal that changes with the slurry state can be obtained. And this slurry state detection probe is fixed above the slurry container to be detected during detection, without the need to extend into the interior of the slurry container to be detected, enabling non-contact measurement. The slurry state detection probe is not affected by the particle size in the slurry during detection, which can further improve the accuracy of slurry state detection. Through module integration, the driving of the slurry state detection probe, subsequent data processing, and state judgment are realized, which can improve the detection efficiency while reducing the workload of manual data processing and is easy to operate.

[0020] In a third aspect, the present application also provides a method for detecting the state of a slurry based on pulsed eddy current, including: driving the above-mentioned slurry state detection probe; wherein, the slurry detection probe is located at a preset distance directly above the slurry container to be detected;

[0021] Controlling the generation of eddy currents inside the slurry container to be detected, so that the slurry state detection probe generates a detection voltage signal according to the eddy currents; wherein, the slurry container to be detected is used for storing the slurry to be detected;

[0022] Performing analog-to-digital conversion on the detection voltage signal and outputting the converted data;

[0023] Performing operations on the converted data according to a preset algorithm and outputting the state of the slurry to be detected.

[0024] In this way, by using a slurry state detection probe based on pulsed eddy current technology to detect the slurry to be detected, a corresponding detection voltage signal that changes with the slurry state can be obtained. And this slurry state detection probe is fixed above the slurry container to be detected during detection, without the need to extend into the interior of the slurry container to be detected, enabling non-contact measurement. The slurry state detection probe is not affected by the particle size in the slurry during detection, which can further improve the accuracy of slurry state detection. When using the above method for slurry state detection, compared with the slurry state detection methods in the prior art, the slurry state detection method of the embodiment of the present invention has the advantages of easy operation and low cost while meeting the accurate measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic structural diagram of a slurry state detection probe based on pulsed eddy current provided by an embodiment of the present invention;

[0026] Figure 2 is a schematic module diagram of a slurry state detection device based on pulsed eddy current provided by an embodiment of the present invention;

[0027] Figure 3It is a schematic flowchart of a slurry state detection method based on pulsed eddy current provided by an embodiment of the present invention. Detailed implementation manners

[0028] The following will further describe in detail the specific implementation manners of the present invention in conjunction with the accompanying drawings and embodiments. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0029] The following will describe the embodiments of the present application in conjunction with the accompanying drawings in the embodiments of the present application.

[0030] The terms "first" and "second" etc. in the specification and claims of the present application and the accompanying drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or units inherent to these processes, methods, products or devices.

[0031] Referring to "embodiments" herein means that the specific features, structures or characteristics described in conjunction with the embodiments can be included in at least one embodiment of the present application. The phrase appears in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0032] First, some terms in the present application are explained to facilitate the understanding of those skilled in the art.

[0033] (1) Pulse signal generator: A type of signal generator, which can be divided into two types: mixed signal source and logic signal source. Among them, the mixed signal source mainly outputs analog waveforms; the logic signal source outputs digital waveforms. The mixed signal source can be further divided into function signal generators and arbitrary waveform / function generators. Among them, the function signal generator outputs standard waveforms, such as sine waves, square waves, etc., and the arbitrary waveform / function generator outputs arbitrary waveforms defined by users.

[0034] (2) Host computer: The host computer refers to a computer that can directly issue control commands, generally a PC / host computer / master computer / upper computer, and various signal changes (such as hydraulic pressure, water level, temperature, etc.) are displayed on the screen.

[0035] (3) Digital-to-Analog Converter: Also known as D / A converter, abbreviated as DAC, it is a device that converts digital quantities into analog ones. The D / A converter basically consists of four parts, namely the weighted resistor network, operational amplifier, reference power supply, and analog switch.

[0036] (4) Amplifier Circuit: A common transmitting circuit generally consists of a high-frequency oscillation circuit, an intermediate amplification stage, a high-frequency power amplifier, and a modulation circuit. For remote control devices in different scenarios, the composition of the transmitting circuit is different. For example, when remotely controlling household appliances or toys at close range, the power output by the transmitting circuit only needs to be 10 - 20 mW, and there is no need for an intermediate amplification stage and a high-frequency power amplifier. The modulation circuit can directly modulate the high-frequency oscillation circuit for transmission.

[0037] (5) Filter Circuit: Filter circuits are often used to filter out the ripple in the rectified output voltage and generally consist of reactance elements. For example, a capacitor C is connected in parallel across the load resistor, or an inductor L is connected in series with the load, as well as various complex filter circuits composed of capacitors and inductors.

[0038] (6) Kalman Filter: Data filtering is a data processing technique for removing noise and restoring real data. Kalman filter can estimate the state of a dynamic system from a series of data with measurement noise when the measurement variance is known. Since it is convenient to implement with computer programming and can update and process the data collected on-site in real time, Kalman filter is currently the most widely used filtering method and has been well applied in many fields such as communication, navigation, guidance, and control.

[0039] (7) A / D Converter: The circuit that converts an analog signal into a digital signal is called an analog-to-digital converter (abbreviated as a / d converter or adc, analog to digital converter). The role of A / D conversion is to convert an analog quantity that is continuous in time and amplitude into a digital signal that is discrete in time and amplitude. Therefore, A / D conversion generally goes through four processes: sampling, holding, quantization, and encoding. In actual circuits, some of these processes are combined. For example, sampling and holding, quantization and encoding are often achieved simultaneously during the conversion process.

[0040] Example 1

[0041] See Figure 1 , Figure 1It is a schematic structural diagram of a slurry state detection probe based on pulsed eddy current provided by an embodiment of the present invention. An embodiment of the present invention provides a slurry state detection probe based on pulsed eddy current, including a pick-up coil 1, an exciting coil 2, an insulating layer 3, a housing 4, and a coil shaft 5. The pick-up coil 1 is wound around the upper end of the shaft body of the coil shaft 5, and the exciting coil 2 is wound around the lower end of the shaft body of the coil shaft 5. A preset distance is set between the upper and lower ends of the coil shaft 5 to separate the pick-up coil 1 and the exciting coil 2. The pick-up coil 1, the exciting coil 2, and the coil shaft 5 are all elliptical in shape.

[0042] The exciting coil 2 is used to apply a pulsed excitation signal, which will change according to the slurry density and particle precipitation inside the slurry container to be detected. After the slurry to be detected inside the slurry container to be detected receives this pulsed excitation signal, an eddy current phenomenon will occur, generating a rapidly decaying pulsed magnetic field that propagates in the ceramic slurry container. The pick-up coil 1 generates a corresponding detection voltage signal according to the generated pulsed magnetic field.

[0043] As a preferred solution of an embodiment of the present invention, the optimal magnetic field intensity is obtained by using a gradient-based optimization solver in COMSOL software, and the number of turns and the interval of the pick-up coil 1 and the exciting coil 2 are adjusted according to the optimal magnetic field intensity. For the ceramic slurry state monitoring scenario, the number of turns of both the pick-up coil 1 and the exciting coil 2 is 288 - 300 turns, and the interval between the exciting coil 2 and the pick-up coil 1 is 22 mm - 25 mm. Among them, the material of both coils is enameled copper wire, and the outer diameter of the coil is 22 mm - 24 mm, and the inner diameter is 10 mm - 12 mm. Based on the above settings, the accuracy of a slurry state detection probe based on pulsed eddy current provided by an embodiment of the present invention for ceramic slurry state detection can reach 98.56%.

[0044] As another preferred solution of an embodiment of the present invention, an insulating layer 3 is also nested on the shaft body corresponding to the interval between the exciting coil 2 and the pick-up coil 1, which can not only prevent the pick-up coil 1 and the exciting coil 2 from overlapping, but also avoid interference between the currents of the two coils, reduce the interference of environmental factors on the slurry state detection, and the pick-up coil 1 can generate a more accurate detection voltage signal according to the eddy current, further improving the detection accuracy of the slurry state detection probe.

[0045] An embodiment of the present invention provides a slurry state detection probe based on pulsed eddy current. A pulsed excitation signal is applied through an excitation coil, and this pulsed excitation signal will vary with the density of the slurry and the particle precipitation inside the slurry container to be detected. When the detected slurry inside the slurry container to be detected receives this pulsed excitation signal, an eddy current phenomenon will occur, generating a rapidly decaying pulsed magnetic field that propagates in the slurry container to be detected. The pick-up coil is used to generate a corresponding voltage signal that varies with the slurry state according to the magnetic field generated by the pulsed eddy current, so as to realize the detection of the state of the slurry to be detected. At the same time, a preset distance interval is provided between the upper and lower ends of the shaft body, which can prevent the pick-up coil and the excitation coil wound around the upper and lower ends of the shaft body from overlapping and affecting the detection effect. Combining the pulsed eddy current detection technology with the ceramic slurry state detection technology can quickly and conveniently realize the detection of the ceramic slurry state, with simple operation steps and low evaluation costs.

[0046] Embodiment 2

[0047] See Figure 2 , Figure 2 FIG. is a module schematic diagram of a slurry state detection device based on pulsed eddy current provided by an embodiment of the present invention. A slurry state detection device based on pulsed eddy current provided by an embodiment of the present invention includes: a control module 201, a slurry state detection probe 202, a data processing module 203, and an operation module 204.

[0048] The control module 201 is used to drive the slurry state detection probe 202. Among them, the control module 201 specifically includes: a pulse signal generating unit, a digital-to-analog conversion unit, a driving circuit unit, and a transmitting circuit unit.

[0049] The pulse signal generating unit is used to output a pulsed driving signal, and the host computer controls the pulse signal generator to output a sine wave driving signal. The analog-to-digital conversion unit is used to convert the sine wave driving signal into an analog signal by using a D / A converter and input it to the driving circuit. The driving circuit unit is used to amplify the power of the analog signal input to the driving circuit. In an embodiment of the present invention, the driving circuit unit includes a driving circuit and a power amplifier circuit based on a metal-oxide-semiconductor field-effect transistor (MOSFET). The voltage of the driving circuit based on MOSFET is constantly 460V. A single-chip microcomputer is used as the main control chip (the model of the single-chip microcomputer can be selected according to specific applications and is not limited here). It has a small driving power, a fast switching speed, and a high working frequency. Since the power amplifier circuit is a common existing circuit, it will not be described in detail here.

[0050] The transmitting circuit unit is used to send the amplified analog signal to the slurry state detection probe. A common transmitting circuit generally consists of a high-frequency oscillation circuit, an intermediate amplification stage, a high-frequency power amplifier, and a modulation circuit. According to different application scenarios, the composition of the transmitting circuit will also be adjusted adaptively. Since the structure of the transmitting circuit is a relatively mature existing technology, it will not be limited and elaborated here.

[0051] The slurry state detection probe 202 is used to control the generation of eddy currents inside the slurry container to be detected and generate corresponding detection voltage signals and send them to the data processing module; wherein, the slurry state detection probe is located 3 cm directly above the slurry container to be detected. A slurry state detection probe provided by an embodiment of the present invention includes the functions of the slurry state detection probe based on pulsed eddy currents described in Embodiment 1. And the slurry state detection probe 202 is fixed above the slurry container to be detected during detection, without the need to extend into the slurry container to be detected, and non-contact measurement can be realized. The slurry state detection probe is not affected by the particle size in the slurry during detection, which can further improve the accuracy of slurry state detection.

[0052] The data processing module 203 is used to perform digital-to-analog conversion on the detection voltage signal and output the converted data. Among them, the data processing module 203 includes a gain amplification unit, a low-pass filtering unit, and an analog-to-digital conversion unit.

[0053] The gain amplification unit is used to perform gain amplification on the detection voltage signal and output a gain-amplified voltage signal. In the embodiment of the present invention, a PGA programmable gain amplifier is used, and the PGA programmable gain amplifier is connected to the input end of the low-pass filtering circuit. The low-pass filtering unit is used to remove the noise interference in the gain-amplified voltage signal and output the filtered gain-amplified voltage signal. In the embodiment of the present invention, a low-pass filtering circuit is used to remove the noise interference in the detection voltage signal based on Kalman filtering. The technical solution of combining the PGA programmable gain amplifier and the low-pass filtering circuit has the advantages of high input impedance, strong common-mode rejection ability, and convenient gain adjustment.

[0054] The analog-to-digital conversion unit converts the output filtered gain-amplified voltage signal into a digital gain-amplified voltage signal and inputs it to the operation module. The analog-to-digital conversion unit in the embodiment of the present invention includes a 20MHz analog-to-digital conversion PCI adapter and an A / D converter. Among them, the A / D converter uses an ADS1222 or ADS1220 chip. This solution has a high measurement resolution, especially suitable for ceramic slurry state detection and applications with power limitations.

[0055] The operation module 204 is used to perform operations on the converted data according to a preset algorithm and output the state of the slurry to be detected. Among them, the operation module 204 includes an operation processing unit and a slurry state judgment unit.

[0056] The arithmetic processing unit is used to perform arithmetic operations on the digitally amplified voltage signal according to a preset formula and output a slurry state detection voltage. Specifically, it includes: obtaining the digitally amplified voltage signal, and generating a detection voltage in a no-slurry state according to a preset formula before placing the slurry to be detected into the interior of the container for the slurry to be detected. It can be expressed by the following formula:

[0057] ;

[0058] In the formula, is the detection voltage in the no-slurry state (i.e., the output voltage of the pickup coil 1 in the no-slurry state); is the mutual inductance between the exciting coil 2 and the pickup coil 1; is the excitation voltage (i.e., the digitally amplified voltage signal); is the impedance of the exciting coil 2; is the impedance of the pickup coil 1; is the resistance of the exciting coil 2; is the angular velocity; is the angular momentum. The coil impedance can be measured by an impedance analyzer.

[0059] Generate a slurry state detection voltage in the state where the slurry to be detected is placed inside the container for the slurry to be detected according to a preset formula. It can be expressed by the following formula:

[0060] ;

[0061] In the formula, is the slurry state detection voltage (i.e., the output voltage of the pickup coil 1 in the slurry detection state); is the change in impedance of the exciting coil 2; is the change in impedance of the pickup coil 1, is the change in mutual inductance between the exciting coil 2 and the pickup coil 1; is the excitation voltage (i.e., the digitally amplified voltage signal); is the resistance of the exciting coil 2; is the angular velocity; is the angular momentum. The coil impedance can be measured by an impedance analyzer.

[0062] The slurry state judgment unit is used to judge the state of the slurry to be detected according to the slurry state detection voltage. Specifically, it includes: calculating the ratio between the detection voltage in the no-slurry state and the slurry state detection voltage; judging the ratio according to the slurry state judgment standard, and outputting the state of the slurry to be detected.

[0063] Calculate The calculation result is used to determine the state of the slurry to be detected according to the calculation result:

[0064] When ≤ < , it is determined that the state of the slurry is uniform;

[0065] When ≤ < , it is determined that the state of the slurry is sub-uniform;

[0066] When < < , it is determined that the state of the slurry is non-uniform.

[0067] A slurry state detection device based on pulsed eddy current provided by an embodiment of the present invention uses a slurry state detection probe based on pulsed eddy current technology to detect the slurry to be detected, and can obtain a corresponding detection voltage signal that changes with the slurry state. And the slurry state detection probe is fixed above the container of the slurry to be detected during detection, without needing to extend into the container of the slurry to be detected, and non-contact measurement can be realized. The slurry state detection probe is not affected by the particle size in the slurry during detection, and the accuracy of slurry state detection can be further improved. Through module integration, the driving of the slurry state detection probe and subsequent data processing and state judgment are realized, which can reduce the work of manual data processing while improving the detection efficiency, and the operation is simple.

[0068] Embodiment 3

[0069] See Figure 3 , Figure 3 is a schematic flowchart of a slurry state detection method based on pulsed eddy current provided by an embodiment of the present invention. The method includes steps 301 to 304, and the specific steps are as follows:

[0070] Step 301: Drive the slurry state detection probe of the embodiment of the present invention; wherein, the slurry detection probe is located at a preset distance directly above the container of the slurry to be detected.

[0071] Step 302: Control an eddy current to be generated inside the container of the slurry to be detected, so that the slurry state detection probe generates a detection voltage signal according to the eddy current; wherein, the container of the slurry to be detected is used to store the slurry to be detected.

[0072] Step 303: Perform digital-to-analog conversion on the detection voltage signal and output the converted data.

[0073] Step 304: Perform an operation on the converted data according to a preset algorithm and output the state of the slurry to be detected.

[0074] Among them, performing analog-to-digital conversion on the detected voltage signal and outputting the converted data specifically further includes: performing gain amplification on the detected voltage signal and outputting a gain-amplified voltage signal; removing noise interference in the gain-amplified voltage signal and outputting a filtered gain-amplified voltage signal; converting the output filtered gain-amplified voltage signal into a digital gain-amplified voltage signal. A slurry state detection probe provided by an embodiment of the present invention includes the functions of the slurry state detection probe based on pulsed eddy current described in Embodiment 1.

[0075] A slurry state detection method based on pulsed eddy current provided by an embodiment of the present invention uses a slurry state detection probe based on pulsed eddy current technology to detect a slurry to be detected, and a corresponding detected voltage signal that changes with the slurry state can be obtained. And the slurry state detection probe is fixed above the slurry container to be detected during detection, without needing to extend into the slurry container to be detected, and non-contact measurement can be realized. The slurry state detection probe is not affected by the particle size in the slurry during detection, and the accuracy of slurry state detection can be further improved. Using the above method for slurry state detection, compared with the slurry state detection methods in the prior art, the slurry state detection method of the embodiment of the present invention has the advantages of simple operation and low cost while meeting the accurate measurement accuracy.

[0076] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and substitutions can be made, and these improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A slurry state detection device based on pulsed eddy current, characterized in that, Including: A control module, a data processing module, an operation module, and a slurry state detection probe; The slurry state detection probe includes: a coil shaft, a pick-up coil, and an excitation coil; the pick-up coil is wound around the upper end of the shaft body of the coil shaft; wherein, the excitation coil is used to apply a pulse excitation signal to generate eddy currents inside the slurry container to be detected; the excitation coil is wound around the lower end of the shaft body of the coil shaft; wherein, the pick-up coil is used to generate a corresponding detection voltage signal according to the eddy currents; there is a preset distance interval between the upper end and the lower end of the shaft body; an insulating layer is nested at the shaft body corresponding to the interval; The control module is used to drive the slurry state detection probe; The slurry state detection probe is used to control the generation of eddy currents inside the slurry container to be detected, generate a detection voltage signal according to the eddy currents and send it to the data processing module; wherein, the slurry state detection probe is located at a preset distance directly above the slurry container to be detected; The data processing module is used to perform digital-to-analog conversion on the detection voltage signal and output the converted data; the data processing module includes a gain amplification unit, a low-pass filtering unit, and an analog-to-digital conversion unit; the gain amplification unit is used to perform gain amplification on the detection voltage signal and output a gain-amplified voltage signal; the low-pass filtering unit is used to remove the noise interference in the gain-amplified voltage signal and output a filtered gain-amplified voltage signal; the analog-to-digital conversion unit is used to convert the output filtered gain-amplified voltage signal into a digital gain-amplified voltage signal and input it to the operation module; The operation module is used to perform operations on the converted data according to a preset algorithm and output the state of the slurry to be detected; the operation module includes an operation processing unit and a slurry state judgment unit; The operation processing unit is used to perform operations on the digital gain-amplified voltage signal according to a preset formula and output a slurry state detection voltage; wherein, the digital gain-amplified voltage signal is obtained, and before the slurry to be detected is placed inside the slurry container to be detected, a detection voltage in the state without slurry is generated according to a first preset formula; a slurry state detection voltage is generated according to a second preset formula; The slurry state judgment unit is used to judge the state of the slurry to be detected according to the slurry state detection voltage; calculate the ratio of the detection voltage in the state without slurry to the slurry state detection voltage; judge the ratio according to the slurry state judgment standard and output the state of the slurry to be detected.

2. The slurry state detection device based on pulsed eddy current according to claim 1, wherein The control module includes: a pulse signal generating unit, a digital-to-analog conversion unit, a driving circuit unit, and a transmitting circuit unit; The pulse signal generating unit is used to output a pulse driving signal; The digital-to-analog conversion unit is used to convert the pulse driving signal into an analog signal and input it to the driving circuit; The driving circuit unit is used to perform power amplification on the analog signal input to the driving circuit; The transmitting circuit unit is used to send the power-amplified analog signal to the slurry state detection probe.

3. A method for detecting the state of slurry based on pulsed eddy current, characterized in that, Applicable to the slurry state detection device based on pulsed eddy current as described in any one of claims 1-2, comprising: Drive the slurry state detection device based on pulsed eddy current as described in any one of claims 1-2; wherein, the slurry detection probe is located at a preset distance directly above the slurry container to be detected; Control the generation of eddy current inside the slurry container to be detected, so that the slurry state detection probe generates a detection voltage signal according to the eddy current; wherein, the slurry container to be detected is used to store the slurry to be detected; Perform analog-to-digital conversion on the detection voltage signal and output the converted data; Perform operations on the converted data according to a preset algorithm and output the state of the slurry to be detected.

4. The slurry state detection method based on pulsed eddy current according to claim 3, wherein The performing analog-to-digital conversion on the detection voltage signal and outputting the converted data specifically includes: Perform gain amplification on the detection voltage signal and output a gain-amplified voltage signal; Remove the noise interference in the gain-amplified voltage signal and output the filtered gain-amplified voltage signal; Convert the output filtered gain-amplified voltage signal into a digital gain-amplified voltage signal.

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