Real-time detection method and system for slurry quality

Abstract

The present invention relates to a real-time slurry quality detection method and system. The method comprises: configuring an ultrasonic probe unit to scan and detect the slurry, generating target ultrasonic reflection information of the slurry after the scanning and detection, wherein the target ultrasonic reflection information of the slurry includes at least m groups of slurry ultrasonic reflection signal groups, wherein the m groups of slurry ultrasonic reflection signal groups are generated by performing m ultrasonic scans of the slurry in sequence using the ultrasonic probe unit; calculating a reflection signal correlation array corresponding to each probe array element based on the m groups of slurry ultrasonic reflection signal groups and the order in which the m groups of slurry ultrasonic reflection signal groups are generated; and determining the slurry quality status based on the reflection signal correlation array of each probe array element, wherein the slurry quality status includes the absence of foreign matter in the slurry or the presence of foreign matter in the slurry. The present invention can detect slurry quality in real time with high detection efficiency and accuracy.

Description

Technical Field

[0001] The present invention relates to a detection method and system, in particular to a real-time detection method and system for slurry quality. Background Art

[0002] At present, lithium-ion batteries are widely used in consumer electronics, automobiles, clean energy and other fields, which places increasing demands on the production quality of lithium-ion batteries. Therefore, research on efficient and rapid battery diagnostic methods is of great significance for improving battery quality, battery life and the efficiency of the manufacturing process.

[0003] In the production process of lithium-ion batteries, slurry preparation is generally the first process step. During slurry preparation, a stirring step is required. The quality of the slurry after stirring generally directly affects the subsequent coating and the final battery performance, and is an important indicator for determining battery costs. Therefore, in the lithium-ion battery production process, the quality of the slurry before coating occupies a core position. Therefore, it can be seen that quality testing of the slurry before coating is crucial.

[0004] It is understandable that after the quality test of the slurry, the slurry quality can be evaluated based on the quality test results. Specifically, the slurry quality evaluation includes: evaluating whether the slurry is suitable for subsequent coating processes, whether it is beneficial to the performance of battery active materials, etc.

[0005] As can be seen from the above description, the lack of effective monitoring of the slurry before coating during the production process may lead to poor quality of lithium-ion batteries and low resource utilization efficiency. Therefore, when testing lithium-ion battery slurry, the detection method is generally required to be fast, non-destructive, and inexpensive.

[0006] At present, when using ultrasound to detect slurry quality, there are problems such as great detection difficulty, low detection efficiency, and low detection accuracy, which makes it difficult to meet the current demand for ultrasonic detection of slurry. Summary of the Invention

[0007] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a method and system for real-time detection of slurry quality, which can perform real-time detection of slurry quality with high detection efficiency and accuracy.

[0008] According to the technical solution provided by the present invention, a real-time detection method for slurry quality is provided, and the real-time detection method includes:

[0009] The ultrasonic probe unit is configured to scan and detect the slurry to generate slurry target ultrasonic reflection information after the scanning and detection, wherein:

[0010] The slurry target ultrasonic reflection information includes at least m groups of slurry ultrasonic reflection signal groups, wherein the m groups of slurry ultrasonic reflection signal groups are generated by sequentially performing m ultrasonic scans on the slurry using an ultrasonic probe unit.

[0011] For any slurry ultrasonic reflection signal group, the slurry ultrasonic reflection signal group includes a plurality of slurry ultrasonic reflection signals, wherein one slurry ultrasonic reflection signal is collected by one probe array element in the ultrasonic probe unit;

[0012] Based on the m groups of slurry ultrasonic reflection signal groups and the generation order of the m groups of slurry ultrasonic reflection signal groups, a reflection signal phase relationship array corresponding to each probe array element is calculated, wherein,

[0013] For any reflection signal correlation array, it includes (m-1)*q reflection signal correlation coefficients, where each reflection signal correlation coefficient is generated by the correlation operation of the sampling signal values ​​corresponding to two adjacent slurry ultrasonic reflection signals, and q is the number of sampling points of each slurry ultrasonic reflection signal;

[0014] The quality status of the slurry is determined based on an array of reflection signal correlations of all probe array elements, wherein the quality status of the slurry includes the absence of foreign matter in the slurry or the presence of foreign matter in the slurry.

[0015] Based on the correlation array of the reflected signal of each probe array element, the quality status of the slurry is determined, including:

[0016] Based on the order of generating m groups of slurry ultrasonic reflection signal groups by ultrasonic scanning, a reflection signal correlation array of the current probe array element is calculated and generated, wherein, in the reflection signal correlation array, the reflection signal correlation coefficient of each column corresponds to the same sampling position point;

[0017] For the m-1 reflection signal correlation coefficients belonging to the same sampling position, when all reflection signal correlation coefficients are not lower than the reflection signal correlation coefficient threshold, it is determined that the quality status of the slurry area corresponding to the current sampling position is that there is no foreign matter in the area;

[0018] For the m-1 reflection signal correlation coefficients belonging to the same sampling position, when there are n consecutive reflection signal correlation coefficients lower than the reflection signal correlation coefficient threshold, it is determined that the quality status of the slurry area corresponding to the current sampling position is that foreign matter exists in the area, where 2≤n≤m-1;

[0019] Based on the correlation array of the reflected signals of all the probe array elements, when it is determined that there is a sampling position point corresponding to the slurry area whose quality status is that foreign matter exists in the area, the quality status of the slurry is determined to be that foreign matter exists in the slurry;

[0020] Based on the correlation array of the reflected signals of all the probe array elements, when the quality status of the slurry area corresponding to all the sampling position points is that there is no foreign matter in the area, the quality status of the slurry is determined to be that there is no foreign matter in the slurry.

[0021] Based on the correlation array of the reflected signal of each probe array element, the quality status of the slurry is determined, which also includes:

[0022] For m-1 reflection signal correlation coefficients belonging to the same sampling position, if there is a reflection signal correlation coefficient lower than the reflection signal correlation coefficient threshold, and the number of reflection signal correlation coefficients that are continuously lower than the reflection signal correlation coefficient threshold is less than n, it is determined that the quality state of the slurry area corresponding to the current probe array element 3 has interference noise;

[0023] When it is determined that the quality status of the slurry area is that interference noise exists, the existing interference noise is eliminated.

[0024] An ultrasonic probe unit is arranged in the conveying direction of the slurry, wherein:

[0025] The ultrasonic probe unit includes two ultrasonic linear array probes, probe array elements are distributed on the ultrasonic linear array probes, and the distribution direction of the probe array elements on each ultrasonic linear array probe is perpendicular to the conveying direction of the slurry;

[0026] When the quality state of the slurry area is determined to be abnormal based on the correlation array of the reflected signal of at least one probe array element, the slurry is subjected to abnormal state analysis processing. When it is determined after the abnormal state analysis processing that the abnormality in the slurry is the presence of foreign matter in the slurry, the length of the foreign matter is calculated.

[0027] When analyzing and handling abnormal conditions, the following are included:

[0028] Based on the correlation array of the reflected signal of the probe array element, the correlation coefficient statistics of each sampling position point are calculated, and the correlation coefficient statistics of the probe array element are generated based on the correlation coefficient statistics of each sampling position point, where:

[0029] For the reflection signal correlation coefficient of any sampling position point, when the reflection signal correlation coefficient is lower than the reflection signal correlation coefficient threshold, the correlation coefficient state identification signal corresponding to the current reflection signal correlation coefficient is configured to 1; otherwise, the correlation coefficient state identification signal corresponding to the current reflection signal correlation coefficient is configured to 0;

[0030] Adding all correlation coefficient state identification signals corresponding to the same sampling position point, and taking the accumulated value of all correlation coefficient state identification signals as the correlation coefficient statistical value of the current sampling position point;

[0031] Generate probe array element correlation coefficient statistics based on correlation coefficient statistics of all sampling position points;

[0032] For probe element correlation coefficient statistical information of any probe element, when any correlation coefficient statistical value in the probe element correlation coefficient statistical information is not lower than the correlation coefficient statistical threshold, configuring the sampling position point corresponding to the correlation coefficient statistical value as the target sampling position point;

[0033] For each slurry target ultrasonic reflection information, all target sampling position points are clustered to determine the centroid position of all foreign objects corresponding to the current slurry target ultrasonic reflection information after clustering;

[0034] For any two adjacent slurry target ultrasonic reflection information, the centroid positions of the bubbles corresponding to the two slurry target ultrasonic reflection information are compared and analyzed to determine the continuous scanning detection number of each foreign object after the comparative analysis;

[0035] Based on the number of consecutive scan detections of each foreign object, the length of the foreign object is calculated.

[0036] All target sampling locations are clustered, and the clustering method includes one of the meanshift algorithm, k-means clustering, hierarchical clustering, DBSCAN clustering, GMM clustering, spectral clustering or OPTICS clustering.

[0037] When it is determined that there is foreign matter in the slurry, the length of the foreign matter is calculated based on the time trajectory of the foreign matter, and then:

[0038]

[0039] Where dd is the length of the foreign body, v is the flow rate of the slurry, num is the number of continuous scanning detections, and prf is the repetition frequency of ultrasonic waves emitted by each probe element in the ultrasonic linear array probe.

[0040] For each probe array element, the repetition frequency prf of the ultrasonic wave is:

[0041]

[0042] Among them, d 异物 The detection limit size of the ultrasonic probe unit during scanning detection, d 滤芯 is the diameter of the filter element for filtering the slurry in transit, and v is the flow rate of the slurry;

[0043] When the repetition frequency of ultrasonic transmission of each probe array element is configured as prf, the slurry flow distances corresponding to the signal sampling values ​​of the same sampling position points in any two adjacent slurry ultrasonic reflection signals of the probe array element are consistent.

[0044] When two ultrasonic linear array probes are used for scanning and testing, the ultrasonic scanning modes of the probe elements in the ultrasonic linear array probes include vertical staggered scanning or oblique cross scanning.

[0045] A real-time detection system for slurry quality includes an ultrasonic probe unit and an ultrasonic detection processing device, wherein:

[0046] Performing ultrasonic testing on the slurry using an ultrasonic probe unit to generate target ultrasonic reflection information of the slurry after scanning and testing;

[0047] The ultrasonic detection and processing device processes the ultrasonic reflection information of the slurry target using the above-mentioned detection method to determine the quality status of the slurry.

[0048] The advantages of the present invention are as follows: the ultrasonic probe unit is used to scan and detect the slurry to obtain the ultrasonic reflection information of the slurry target. Thereafter, the reflection signal phase relationship array of each probe array element is calculated based on the slurry target ultrasonic reflection information. Then, the quality status of the slurry can be determined based on the reflection signal phase relationship array of all probe array elements. That is, the slurry quality can be detected in real time, thereby improving the detection efficiency and detection accuracy of the slurry quality detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 This is a flow chart of an embodiment of the present invention for performing quality inspection on slurry.

[0050] Figure 2 The present invention is a flowchart of an embodiment of comparative analysis.

[0051] Figure 3 A schematic diagram of an embodiment of scanning detection performed by an ultrasonic probe unit of the present invention.

[0052] Figure 4 A schematic diagram of another embodiment of scanning detection performed by the ultrasonic probe unit of the present invention.

[0053] Figure 5 This is a schematic diagram of an embodiment of determining the length of a foreign body according to the present invention.

[0054] Figure 6 A schematic diagram of an embodiment of constructing a coordinate system according to the present invention.

[0055] Explanation of the accompanying drawings: 1-first ultrasonic linear array probe, 2-second ultrasonic linear array probe, 3-probe array element, 4-foreign body. DETAILED DESCRIPTION

[0056] The present invention will be further described below with reference to specific drawings and embodiments.

[0057] In order to detect the slurry quality in real time, the present invention provides a real-time detection method for slurry quality, which includes:

[0058] The ultrasonic probe unit is configured to scan and detect the slurry to generate slurry target ultrasonic reflection information after the scanning and detection, wherein:

[0059] The slurry target ultrasonic reflection information includes at least m groups of slurry ultrasonic reflection signal groups, wherein the m groups of slurry ultrasonic reflection signal groups are generated by sequentially performing m ultrasonic scans on the slurry using an ultrasonic probe unit.

[0060] For any slurry ultrasonic reflection signal group, the slurry ultrasonic reflection signal group includes a plurality of slurry ultrasonic reflection signals, wherein one slurry ultrasonic reflection signal is collected by one probe array element 3 in the ultrasonic probe unit;

[0061] Based on the m groups of slurry ultrasonic reflection signal groups and the generation order of the m groups of slurry ultrasonic reflection signal groups, a reflection signal phase relationship array corresponding to each probe array element 3 is calculated, where:

[0062] For any reflection signal correlation array, it includes (m-1)*q reflection signal correlation coefficients, where each reflection signal correlation coefficient is generated by the correlation operation of the sampling signal values ​​corresponding to two adjacent slurry ultrasonic reflection signals, and q is the number of sampling points of each slurry ultrasonic reflection signal;

[0063] The quality status of the slurry is determined based on the correlation array of the reflection signals of all the probe array elements 3 , wherein the quality status of the slurry includes whether there is no foreign matter 4 in the slurry or whether there is foreign matter 4 in the slurry.

[0064] In order to perform real-time quality testing on the slurry, the present invention configures ultrasonic scanning and testing of the slurry. When performing ultrasonic scanning and testing, an ultrasonic probe unit should be configured, and the configured ultrasonic probe unit is then used to scan and test the slurry. It should be noted that when the ultrasonic probe unit is used to scan and test the slurry, the slurry is generally in a flowing state. For example, the ultrasonic probe unit can be used to scan and test the slurry being transported in a conveying pipe. Therefore, when performing ultrasonic scanning and testing on the slurry, the configured ultrasonic probe unit should be compatible with the flow of the slurry. The configuration of the ultrasonic probe unit can refer to the corresponding description below.

[0065] It should be noted that after ultrasonic scanning and detection of the slurry, the slurry target ultrasonic reflection information can be obtained, wherein the slurry target ultrasonic reflection information can be formed based on the ultrasonic reflection signal during the acquisition and scanning detection, such as Figure 1In one embodiment of the present invention, the slurry target ultrasonic reflection information should include at least m groups of slurry ultrasonic reflection signal groups. The number of slurry ultrasonic reflection signal groups in the slurry target ultrasonic reflection information can be selected according to actual needs to meet the requirements of slurry quality detection. For example, one slurry target ultrasonic reflection information may include three groups of slurry ultrasonic reflection signal groups. In this case, the value of m should be 3.

[0066] Specifically, when the ultrasonic probe unit is used to perform an ultrasonic scan on the slurry, a group of slurry ultrasonic reflection signal groups will be generated. Generally, each group of slurry ultrasonic reflection signal groups includes the same number of slurry ultrasonic reflection signals, wherein one slurry ultrasonic reflection signal is obtained by collecting the ultrasonic reflection signal by one probe array element 3 in the ultrasonic probe unit. Therefore, the number of slurry ultrasonic reflection signals in the slurry ultrasonic reflection signal group generally corresponds to the number of the above-mentioned configured ultrasonic probe units.

[0067] As can be seen from the above description, the target slurry ultrasonic reflection information is generated by sequentially performing m ultrasonic scans of the slurry using the ultrasonic probe unit. Therefore, the m groups of slurry ultrasonic reflection signal groups have a strict generation order, for example, the generation order of the m groups of slurry ultrasonic reflection signal groups is 1, 2, ..., m. After determining the generation order of the m groups of slurry ultrasonic reflection signal groups, the reflection signal correlation array corresponding to each probe array element 3 can be calculated. The following describes the method and process for calculating the reflection signal correlation array for each probe array element.

[0068] As can be seen from the above description, for any probe element 3 within the ultrasonic probe unit, the slurry target ultrasonic reflection information includes m slurry ultrasonic reflection signals corresponding to the probe element 3. These m slurry ultrasonic reflection signals belong to m groups of slurry ultrasonic reflection signals. Therefore, the order of the m slurry ultrasonic reflection signals corresponding to each probe element 3 can be consistent with the order in which the m groups of slurry ultrasonic reflection signals are generated. In this case, for each probe element 3, the slurry ultrasonic reflection signals can be generated in the order 1, 2, ..., m.

[0069] It should be understood that each slurry ultrasonic reflection signal is generated by sampling the ultrasonic reflection signal. Generally, each slurry ultrasonic reflection signal may correspond to q sampling positions, and each sampling position corresponds to a sampling signal value. The number of sampling positions q can be selected as needed, such as by setting the sampling frequency, etc., and is based on meeting the requirements for slurry quality testing. Generally, each slurry ultrasonic reflection signal corresponds to the same number of sampling positions, that is, each slurry ultrasonic reflection signal is composed of the sampling signal values ​​corresponding to q sampling positions.

[0070] In a specific implementation, based on the m slurry ultrasonic reflection signals corresponding to each probe array element 3, the reflection signal correlation array of the probe array element 3 is calculated. As can be seen from the above description, the reflection signal correlation array of each probe array element 3 should include (m-1)*q reflection signal correlation coefficients, wherein each reflection signal correlation coefficient is generated by performing a correlation operation on the sampling signal values ​​of the same sampling position point in two adjacent slurry ultrasonic reflection signals. For example, if the generation order of the two adjacent slurry ultrasonic reflection signals is sequence 1 and sequence 2, respectively, when performing the correlation operation, a sampling signal value corresponding to a sampling position point is selected in the slurry ultrasonic reflection signal with sequence 1, and thereafter, a sampling signal value of the same sampling position point is selected in the slurry ultrasonic reflection signal with sequence 2. The reflection signal correlation coefficient can be obtained after the two selected sampling signal values ​​are correlated. The calculation method of each other reflection signal correlation coefficient can refer to the description here.

[0071] Since the slurry target ultrasonic reflection information includes m groups of slurry ultrasonic reflection signal groups, when calculating the reflection signal correlation coefficient using the above method, q reflection signal correlation coefficients can be calculated for any two adjacent slurry ultrasonic reflection signals corresponding to each probe array element 3. Therefore, based on the m groups of slurry ultrasonic reflection signal groups, (m-1)*q reflection signal correlation coefficients corresponding to each probe array element 3 can be calculated. Based on the (m-1)*q reflection signal correlation coefficients, a reflection signal correlation array can be formed. It can be understood that the reflection signal correlation array of each probe array element 3 is a two-dimensional array, and the dimension of the two-dimensional array is (m-1)*q.

[0072] In specific implementation, when calculating the correlation coefficient of the reflected signal, a feasible calculation method is:

[0073]

[0074] Wherein, ρ is the correlation coefficient of the reflected signal, x is the sampling signal value of a sampling position point in the slurry ultrasonic reflection signal, y is the sampling signal value of the same sampling position point in the adjacent slurry ultrasonic reflection signal, and conj(y) is the conjugate of the sampling signal value y.

[0075] Specifically, the sampled signal values ​​within each slurry ultrasonic reflection signal can be represented by a complex number. Therefore, for each determined sampled signal value corresponding to the slurry ultrasonic reflection signal, the conjugate corresponding to the sampled signal value can be calculated, and the corresponding reflection signal correlation coefficient ρ can be calculated. Generally, the sampled signal value x is collected before the sampled signal value y, that is, the generation order of the slurry ultrasonic reflection signal containing the sampled signal value x is before the generation order of the slurry ultrasonic reflection signal containing the sampled signal value y. For example, if the generation order of the slurry ultrasonic reflection signal containing the sampled signal value x is 1, then the generation order of the slurry ultrasonic reflection signal containing the sampled signal value y should be 2. Other situations can be referred to the description here, and examples will not be given one by one.

[0076] After calculating the reflection signal correlation array of each probe array element 3 using the above method, the slurry quality status can be determined based on the reflection signal correlation array of all probe array elements 3. Generally, the determined slurry quality status at least includes whether there is no foreign matter 4 in the slurry or whether there is foreign matter 4 in the slurry. It should be understood that once the slurry quality status is determined, real-time detection of the slurry quality is achieved.

[0077] When foreign matter 4 is present in the slurry, the amplitude of the ultrasonic reflection signal varies due to the variable particle size and type of the foreign matter 4. Therefore, a correlation operation is used to generate a correlation matrix of the reflection signals corresponding to each probe element 3. According to the characteristics of the correlation operation, the correlation operation is more sensitive to signal differences, thus effectively detecting foreign matter 4 in the slurry. However, the correlation operation has high requirements for the frame rate of the ultrasonic reflection signal. If the frame rate is too low, it is easy to miss the difference. However, it is not advisable to blindly require a high frame rate, otherwise it will lead to excessive cost consumption. The frame rate is the frequency at which the same probe element 3 obtains the ultrasonic reflection signals of two adjacent slurries.

[0078] It is understandable that the slurry flow rate of different production lines is different, and the flow rate of slurry with different formulations on the same production line is also different. Therefore, taking into account the actual situation, when scanning and detecting the slurry, the scanning and detection state of the ultrasonic probe unit should be adjusted according to the slurry flow rate to ensure that the distance of the slurry flow corresponding to adjacent frames of data remains unchanged. Specifically, ensuring that the distance of the slurry flow of adjacent frames of data remains unchanged specifically refers to the same slurry flow distance determined based on the signal sampling values ​​of the same sampling position point in any two slurry ultrasonic reflection signals. For example, the slurry flow distance corresponding to a signal sampling value in the slurry ultrasonic reflection signal with a generation order of 2 and the signal sampling value of the same sampling position point in the slurry ultrasonic reflection signal with a generation order of 1 should be equal to the slurry flow distance corresponding to the corresponding signal sampling value in the slurry ultrasonic reflection signal with a generation order of 3 and the corresponding signal sampling value in the slurry ultrasonic reflection signal with a generation order of 2. Here, the corresponding signal sampling value specifically refers to the corresponding to the same sampling position point.

[0079] Figure 1 An embodiment of adjusting the scanning detection state of the ultrasonic probe unit according to the slurry flow rate is shown in FIG. Figure 1 It can be seen that the flow rate of the slurry can be measured by a velocity flow meter. Thereafter, the transmission sequence of the ultrasonic probe unit is adjusted according to the measured velocity flow value of the slurry. Adjusting the transmission sequence of the ultrasonic probe unit is to adjust the repetition frequency or time interval of the ultrasonic signal emitted by the same probe array element 3 to the slurry.

[0080] In one embodiment of the present invention, the repetition frequency prf of each probe array element transmitting ultrasonic waves is:

[0081]

[0082] Among them, d 异物 The detection limit size of the ultrasonic probe unit during scanning detection, d 滤芯 is the diameter of the filter element for filtering the slurry in transit, and v is the flow rate of the slurry;

[0083] When the repetition frequency of ultrasonic transmission of each probe array element 3 is configured to be prf, the slurry flow distances corresponding to the signal sampling values ​​of the same sampling position points in any two adjacent slurry ultrasonic reflection signals of the probe array element 3 are consistent.

[0084] Specifically, the detection limit size d when the ultrasonic probe unit performs scanning detection 异物 It is generally related to the ultrasonic scanning detection resolution of the probe array element 3 used. Generally, d 异物Generally, it can be 0.1mm. It should be noted that when using the conveying pipe to convey the slurry, a filter element can be set in the conveying pipe to filter the slurry to improve the quality of the slurry. When using the filter element to filter the slurry, the diameter of the filter element can be d 滤芯 , filter element diameter d 滤芯 It is generally related to the type of filter element used.

[0085] The unit of slurry flow velocity v is generally mm / s, and the detection limit size d 异物 、Filter element diameter d 滤芯 The corresponding unit of measurement is mm. Therefore, according to the above method, the repetition frequency prf of each probe array element 3 transmitting ultrasonic waves can be obtained. Thereafter, when the repetition frequency of each probe array element transmitting ultrasonic waves is configured to be prf, the slurry flow distances corresponding to the signal sampling values ​​at the same sampling position points in any two adjacent slurry ultrasonic reflection signals of the probe array element 3 can be consistent.

[0086] The following describes in detail the method and process for determining the slurry quality status based on the correlation array of all reflected signals.

[0087] In one embodiment of the present invention, determining the quality state of the slurry based on the correlation matrix of the reflected signal of each probe array element 3 includes:

[0088] Based on the order of generating m groups of slurry ultrasonic reflection signal groups by ultrasonic scanning, a reflection signal correlation array of the current probe array element 3 is calculated and generated, wherein, in the reflection signal correlation array, the reflection signal correlation coefficient of each column corresponds to the same sampling position point;

[0089] For the m-1 reflection signal correlation coefficients belonging to the same sampling position, when all reflection signal correlation coefficients are not lower than the reflection signal correlation coefficient threshold, it is determined that the quality status of the slurry area corresponding to the current sampling position is that there is no foreign matter in the area 4;

[0090] For m-1 reflection signal correlation coefficients belonging to the same sampling position, when there are n consecutive reflection signal correlation coefficients lower than the reflection signal correlation coefficient threshold, the quality status of the slurry area corresponding to the current sampling position is determined to be the presence of foreign matter 4, where 2≤n≤m-1;

[0091] Based on the correlation array of the reflected signals of all the probe array elements 3, when it is determined that there is a sampling position point corresponding to the slurry area whose quality status is that foreign matter 4 exists in the area, the quality status of the slurry is determined to be that foreign matter 4 exists in the slurry;

[0092] Based on the correlation array of the reflection signals of all the probe array elements 3 , when the quality status of the slurry area corresponding to all the sampling position points is that there is no foreign matter 4 in the area, the quality status of the slurry is determined to be that there is no foreign matter 4 in the slurry.

[0093] As can be seen from the above description, the reflection signal correlation array of each probe array element 3 is a two-dimensional array. Within the reflection signal correlation array, the reflection signal correlation coefficient of each column corresponds to the same sampling position point, that is, the reflection signal correlation coefficient of each column is generated by correlating the two adjacent sampling signal values ​​corresponding to the same sampling position point. For example, the first reflection signal correlation coefficient of each column is generated by correlating the first signal sampling value and the second signal sampling value at the same sampling position point. The second reflection signal correlation coefficient of each column should be generated by correlating the second signal sampling value and the third signal sampling value at the same sampling position point. Other cases are similar and will not be explained one by one here. It can be understood that the first signal sampling value should belong to the slurry ultrasonic reflection signal with a generation sequence number of 1, and the second signal sampling value should belong to the slurry ultrasonic reflection signal with a generation sequence number of 2, that is, different signal sampling values ​​belong to different slurry ultrasonic reflection signals.

[0094] In one embodiment, in the reflection signal correlation array, the column numbers are 1 to q, column number 1 corresponds to the first sampling position point at which the current probe array element 3 samples and generates the slurry ultrasonic reflection signal, and column number q corresponds to the qth sampling position point at which the current probe array element 3 samples and generates the slurry ultrasonic reflection signal.

[0095] In specific implementation, the distribution of the reflection signal correlation coefficients in the reflection signal correlation arrays of all probe array elements 3 is consistent, thereby determining the reflection signal correlation array corresponding to each probe array element 3 .

[0096] It can be understood that the slurry ultrasonic reflection signal of each probe array element 3 represents the depth information of the slurry detection, that is, each sampling position point represents the information of the slurry detection. From the above description, it can be seen that a reflection signal correlation coefficient can be used to represent the situation of the slurry in two adjacent ultrasonic scans. When the reflection signal correlation coefficient is 1, it indicates that there is no foreign matter 4 in the two adjacent ultrasonic scans of the current sampling position point. When the reflection signal correlation coefficient is less than 1, it indicates that there is a foreign matter 4 in the two adjacent ultrasonic scans of the current sampling position point.

[0097] Generally, foreign matter 4 in the slurry may be interfering noise, bubbles or agglomerates, wherein agglomerates are larger particle aggregates formed by the aggregation of small particles in the slurry. Therefore, when the quality state of the slurry in the present invention is that foreign matter 4 exists and the foreign matter 4 is not interfering noise, the foreign matter 4 should generally be agglomerates or bubbles.

[0098] In order to meet the universality of foreign body 4 detection, a reflection signal correlation coefficient threshold can be set. Generally, the reflection signal correlation coefficient threshold can be a value close to 1, such as the reflection signal correlation coefficient threshold can generally be set to 0.8. Of course, the reflection signal correlation coefficient threshold can also be set to other values, depending on whether it can meet the detection accuracy requirements for the slurry. After setting the reflection signal correlation coefficient threshold, when the reflection signal correlation coefficient is not less than the reflection signal correlation coefficient threshold, it can be considered that the current reflection signal correlation coefficient can be regarded as meeting the above-mentioned "state when the reflection signal correlation coefficient is 1", which means that there is no foreign body 4; when the reflection signal correlation coefficient is lower than the reflection signal correlation coefficient threshold, it can be considered that the current reflection signal correlation coefficient can meet the above-mentioned "state when the reflection signal correlation coefficient is less than 1", which means that there is foreign body 4.

[0099] It should be understood that when ultrasonic scanning is performed on the slurry, the position of each probe element 3 remains fixed. Therefore, each probe element 3 corresponds to a slurry area within the slurry, and the corresponding slurry area should be related to the position of the probe element 3. At the same time, each sampling position point reflects the depth status of the corresponding slurry area. In one embodiment of the present invention, the reflected signal correlation array of each probe element 3 is calculated. When the correlation coefficient of all reflected signals is not less than the reflection signal correlation coefficient threshold, the quality status of the slurry area corresponding to the current probe element 3 is determined to be free of foreign matter 4.

[0100] For the m-1 reflection signal correlation coefficients belonging to the same sampling position point, when there are n consecutive reflection signal correlation coefficients lower than the reflection signal correlation coefficient threshold, the quality state of the slurry area corresponding to the current sampling position point is determined to be the presence of foreign matter 4 in the area, wherein there are n consecutive reflection signal correlation coefficients, specifically referring to the same column in the reflection signal correlation array, the n reflection signal correlation coefficients are in a continuous arrangement state, such as the n consecutive reflection signal correlation coefficients can be the first reflection signal correlation coefficient of the current column to the nth reflection signal correlation coefficient of the current column, or can be the second reflection signal correlation coefficient of the current column to the n+1th reflection signal correlation coefficient of the current column. The continuous state of the n reflection signal correlation coefficients can be determined according to actual conditions, and please refer to the description here for details.

[0101] In a specific implementation, n should be at least 2. When n is 2, among the m-1 reflection signal correlation coefficients in the same column, there are at least two consecutive reflection signal correlation coefficients that are both lower than the reflection signal correlation coefficient threshold. When n is other values, please refer to the corresponding description here.

[0102] It can be seen from the above description that the quality status of the slurry area in the corresponding slurry is determined by one probe array element 3. After the quality status of the slurry area corresponding to each probe array element 3 is determined, the quality status of the slurry under the current slurry target ultrasonic reflection information can be further determined based on the quality status of the slurry area corresponding to all probe array elements 3. Generally, as long as there is a sampling position point corresponding to the slurry area whose quality status is that there is foreign matter 4 in the area, the quality status of the slurry is determined to be that there is foreign matter 4 in the slurry; when the quality status of the slurry area corresponding to all sampling position points of all slurry ultrasonic reflection signals is that there is no foreign matter 4 in the area, the quality status of the slurry is determined to be that there is no foreign matter 4 in the slurry.

[0103] In one embodiment of the present invention, when determining the quality state of the slurry based on the correlation matrix of the reflected signal of each probe array element 3, the method further includes:

[0104] For m-1 reflection signal correlation coefficients belonging to the same sampling position, if there is a reflection signal correlation coefficient lower than the reflection signal correlation coefficient threshold, and the number of reflection signal correlation coefficients that are continuously lower than the reflection signal correlation coefficient threshold is less than n, it is determined that the quality state of the slurry area corresponding to the current probe array element 3 has interference noise;

[0105] When it is determined that the quality status of the slurry area is that interference noise exists, the existing interference noise is eliminated.

[0106] From the above description, it can be seen that in order to effectively detect the slurry, the scanning frame rate of each probe array element 3 is configured. Since the frame rate of the scanning detection is high enough, for the m-1 reflection signal correlation coefficients belonging to the same sampling position point, when there are n consecutive reflection signal correlation coefficients lower than the reflection signal correlation coefficient threshold, it can be determined that the area corresponding to the slurry is the area where foreign matter 4 exists. On the contrary, according to electronic interference and noise randomness, it often appears only once in the same position and will not appear continuously. Therefore, when the number of reflection signal correlation coefficients that are continuously lower than the reflection signal correlation coefficient threshold is less than n, it can be determined that there is interference noise in the quality status of the corresponding slurry area.

[0107] In specific implementation, when it is determined that the quality state of the slurry is that there is interference noise, the existing interference noise should be eliminated. Eliminating the interference noise is as follows: Figure 1 The interference noise can be ignored at this time. It can be understood that after eliminating the interference noise, the accuracy of the slurry quality detection can be improved.

[0108] It can be understood that since the slurry is in a flowing state, when the slurry is subjected to quality inspection, a plurality of slurry target ultrasonic reflection information will be generated through scanning inspection by the ultrasonic probe unit, wherein the state of each slurry target ultrasonic reflection information should be consistent, such as each slurry target ultrasonic reflection information includes m groups of slurry ultrasonic reflection signal groups.

[0109] It should be noted that some of the same slurry ultrasonic reflection signal groups may exist in the ultrasonic reflection information of two adjacent slurry targets. For example, the two adjacent slurry target ultrasonic reflection information are respectively referred to as the previous slurry target ultrasonic reflection information and the next slurry target ultrasonic reflection information. When the next slurry target ultrasonic reflection information is formed, the slurry ultrasonic reflection signal groups ranked 2 to m in the previous slurry target ultrasonic reflection information may be included. At this time, the slurry ultrasonic reflection signal group ranked 2 in the previous slurry target ultrasonic reflection information should be ranked 1 in the next slurry target ultrasonic reflection information, and the other corresponding rankings are adjusted in turn.

[0110] During specific implementation, the situation of the slurry target ultrasonic reflection information can refer to the above description. After obtaining new slurry target ultrasonic reflection information, the above processing is performed on the new slurry target ultrasonic reflection information, that is, the reflection signal phase relationship array corresponding to each probe array element 3 is calculated, and the reflection signal phase relationship array corresponding to each probe array element 3 is obtained by calculation. The method of determining the slurry quality status based on the reflection signal phase relationship array can refer to the above corresponding description and will not be repeated here.

[0111] In one embodiment of the present invention, an ultrasonic probe unit is arranged in the conveying direction of the slurry, wherein:

[0112] The ultrasonic probe unit includes two ultrasonic linear array probes, and the probe array elements 3 are distributed on the ultrasonic linear array probes, and the distribution direction of the probe array elements 3 on each ultrasonic linear array probe is perpendicular to the conveying direction of the slurry;

[0113] When the quality state of the slurry area is determined to be the presence of foreign matter 4 in the slurry based on the correlation array of the reflected signal of at least one probe array element 3, the slurry is subjected to foreign matter state analysis processing to determine the length of the foreign matter 4 in the slurry after the foreign matter state analysis processing.

[0114] Figure 3 and Figure 4FIG2 shows an embodiment of the ultrasonic probe unit used in the present invention. The two ultrasonic linear array probes in the ultrasonic probe unit are respectively a first ultrasonic linear array probe 1 and a second ultrasonic linear array probe 2. When scanning and detecting the slurry, the first ultrasonic linear array probe 1 and the second ultrasonic linear array probe 2 are parallel to each other. A plurality of probe array elements 3 are arranged in each of the first ultrasonic linear array probe 1 and the second ultrasonic linear array probe 2. Generally, the number of probe array elements 3 in the first ultrasonic linear array probe 1 and the second ultrasonic linear array probe 2 is preferably equal, and the arrangement directions of the plurality of probe array elements 3 are consistent.

[0115] It is understood that the number of probe array elements 3 is based on the need to effectively cover the ultrasonic scanning of the slurry. The number of slurry ultrasonic reflection signals in each group of slurry ultrasonic reflection signals should be consistent with the total number of probe array elements 3 included in the first ultrasonic linear array probe 1 and the second ultrasonic linear array probe 2.

[0116] In specific implementation, when the slurry is transported, the transport direction of the slurry is perpendicular to the arrangement direction of the probe array elements 3 and the corresponding connection direction between the first ultrasonic linear array probe 1 and the second ultrasonic linear array probe 2, such as Figure 3 and Figure 4 In the process, the slurry is transported in the direction perpendicular to Figure 3 and Figure 4 direction of transport. Figure 6 An embodiment of constructing a coordinate system based on the ultrasonic probe unit and the slurry conveying direction is shown in the figure, wherein the x direction is the arrangement direction of the multiple probe array elements 3, the y direction is the direction of the connection between the first ultrasonic linear array probe 1 and the second ultrasonic linear array probe 2, and the z direction is the slurry conveying direction.

[0117] It should be noted that when two ultrasonic linear array probes are used for scanning and detection, the ultrasonic scanning mode of the probe elements in the ultrasonic linear array probes includes vertical staggered scanning or inclined cross scanning, wherein: Figure 3 An embodiment of vertical staggered scanning is shown in FIG. Figure 4 An embodiment of the inclined cross scanning is shown in FIG. The following is an example of how the ultrasonic probe unit scans and detects the slurry.

[0118] Specifically, when scanning and detecting the slurry, the first ultrasonic linear array probe 1 and the second ultrasonic linear array probe 2 can be configured in an aligned state. At this time, the probe array elements 3 at corresponding positions in the first ultrasonic linear array probe 1 and the second ultrasonic linear array probe 2 can be in an aligned arrangement state or in a staggered arrangement state. Figure 3 and Figure 4 An embodiment of the staggered arrangement is shown in FIG.

[0119] During ultrasonic detection scanning, the probe array element 3 in the same ultrasonic linear array probe should sequentially transmit ultrasonic signals to the slurry, and then receive the slurry ultrasonic reflection signal reflected by the slurry. Figure 3 and Figure 4 The probe array elements 3 are configured from left to right in sequence to transmit ultrasonic reflection signals in turn and receive corresponding slurry ultrasonic reflection signals. Generally, after the probe array elements 3 in the two ultrasonic linear array probes transmit ultrasonic signals to the slurry and receive corresponding slurry ultrasonic reflection signals, an ultrasonic scan is completed. As can be seen from the above description, a group of slurry ultrasonic reflection signal groups can be obtained at this time, and the number of slurry ultrasonic reflection signals in the slurry ultrasonic reflection signal group is consistent with the total number of all probe array elements 3 in the ultrasonic probe unit.

[0120] Figure 3 : shows a state of vertical staggered scanning, in which the ultrasonic signal emitted by the probe array element 3 is perpendicular to the direction in which the probe array elements 3 are arranged in the ultrasonic linear array probe; Figure 4 FIG shows a state of tilted cross scanning, in which the ultrasonic signal emitted by the probe array element 3 is tilted, that is, not perpendicular to the arrangement direction of the probe array element 3. It should be noted that when using Figure 3 When using the vertical staggered scanning method, the line density can be increased, the imaging quality can be higher, and the imaging resolution can be improved; when using Figure 4 When the tilt cross scanning is performed, the speckle noise can be suppressed, the imaging quality can be further improved, the noise interference can be reduced, and the success rate of detecting foreign matter in the slurry can be increased.

[0121] It should be noted that during an ultrasonic scan, all probe elements 3 should use the same scanning method, such as vertical staggered scanning or tilted cross scanning. During ultrasonic scanning, the probe elements 3 can be configured to emit vertical ultrasonic signals or tilted ultrasonic signals using commonly used techniques in the art. The specific scanning configuration method will not be further illustrated here.

[0122] Specifically, the quality status of the slurry region is determined to be the presence of foreign matter 4 based on the correlation array of the reflected signal from at least one probe array element 3. That is, based on the ultrasonic reflection information from a target slurry, the quality status of the slurry region can be determined to be the presence of foreign matter 4. The method for determining the quality status of the slurry region as the presence of foreign matter 4 can be referred to the corresponding description above. When foreign matter 4 is present in the slurry, as can be seen from the above description, the foreign matter 4 can be agglomerates or bubbles. Therefore, the slurry is subjected to a foreign matter status analysis process to determine the size of the foreign matter 4 within the slurry after the foreign matter status analysis process.

[0123] In one embodiment of the present invention, the abnormal state analysis process includes:

[0124] Based on the correlation array of the reflected signal of the probe array element 3, the correlation coefficient statistics of each sampling position point are calculated, and the probe array element correlation coefficient statistics information is generated based on the correlation coefficient statistics of each sampling position point, wherein,

[0125] For the reflection signal correlation coefficient of any sampling position point, when the reflection signal correlation coefficient is lower than the reflection signal correlation coefficient threshold, the correlation coefficient state identification signal corresponding to the current reflection signal correlation coefficient is configured to 1; otherwise, the correlation coefficient state identification signal corresponding to the current reflection signal correlation coefficient is configured to 0;

[0126] Adding all correlation coefficient state identification signals corresponding to the same sampling position point, and taking the accumulated value of all correlation coefficient state identification signals as the correlation coefficient statistical value of the current sampling position point;

[0127] Generate probe array element correlation coefficient statistics based on correlation coefficient statistics of all sampling position points;

[0128] For the probe element correlation coefficient statistical information of any probe element 3, when any correlation coefficient statistical value in the probe element correlation coefficient statistical information is not lower than the correlation coefficient statistical threshold, the sampling position point corresponding to the correlation coefficient statistical value is configured as the target sampling position point;

[0129] For each slurry target ultrasonic reflection information, all target sampling position points are clustered to determine the centroid position of all foreign objects 4 corresponding to the current slurry target ultrasonic reflection information after clustering;

[0130] For any two adjacent slurry target ultrasonic reflection information, the centroid positions of the bubbles corresponding to the two slurry target ultrasonic reflection information are compared and analyzed to determine the continuous scanning detection number of each foreign object 4 after the comparison and analysis;

[0131] Based on the number of consecutive scan detections of each foreign object 4, the length of the foreign object 4 is calculated.

[0132] As can be seen from the above description, for each slurry target ultrasonic reflection information, a reflection signal correlation array for each probe element 3 can be calculated. As described above, the reflection signal correlation array for each probe element 3 includes (m-1)*q reflection signal correlation coefficients, and the (m-1)*q reflection signal correlation coefficients are arranged in a two-dimensional array. Based on the reflection signal correlation array for each probe element 3, probe element correlation coefficient statistics should be calculated.

[0133] In order to calculate the correlation coefficient statistics of each sampling position point, the correlation coefficient state identification signal corresponding to each reflection signal correlation coefficient should be determined. Specifically, when determining the value of the correlation coefficient state identification signal, the reflection signal correlation coefficient should be compared with the reflection signal correlation coefficient threshold. If the reflection signal correlation coefficient is lower than the reflection signal correlation coefficient threshold, the value of the corresponding correlation coefficient state identification signal is configured to 1; otherwise, the value of the correlation coefficient state identification signal is configured to 0. In this way, m-1 correlation coefficient state identification signals corresponding to each sampling position point can be obtained.

[0134] For any sampling position point, after obtaining the m-1 correlation coefficient state identification signals corresponding to the sampling position point, the m-1 correlation coefficient state identification signals can be accumulated, and the accumulated value can be used as the correlation coefficient statistical value of the current sampling position point. In specific implementation, when the values ​​of the m-1 correlation coefficient state identification signals are all 1, the corresponding correlation coefficient statistical value should be m-1; when the values ​​of the m-1 correlation coefficient state identification signals are all 0, the corresponding correlation coefficient statistical value should be 0. When the values ​​of the m-1 correlation coefficient state identification signals are other cases, the corresponding correlation coefficient statistical value can be calculated, and examples will not be given here one by one.

[0135] For each probe element 3's reflected signal correlation array, the above method can be used to calculate the probe element correlation coefficient statistical information corresponding to each reflected signal correlation array. As can be seen from the above description, the probe element correlation coefficient statistical information includes q correlation coefficient statistical values, with each correlation coefficient statistical value corresponding to one sampling location. It is understood that the number of correlation coefficient statistical values ​​in the probe element correlation coefficient statistical information coincides with the number of sampling locations for each slurry ultrasonic reflection signal, and there is a one-to-one correspondence between the relevant information statistical values ​​and the sampling locations.

[0136] For the correlation coefficient statistical information of each probe array element, when any correlation coefficient statistical value is not lower than the correlation coefficient statistical threshold, the sampling position point corresponding to the correlation coefficient statistical value is configured as the target sampling position point. Specifically, the correlation coefficient statistical threshold can be selected as needed, such as the correlation coefficient statistical threshold can be m-1, m-2 or m-3, which is related to the value of m and the accuracy requirement for slurry ultrasonic detection. For example, the correlation coefficient statistical threshold can be set to m-1.

[0137] It is understood that when a sampling location is configured as a target sampling location, the quality state of the slurry area determined at the current target sampling location is determined to be the presence of foreign matter 4 in the slurry. After all target sampling locations are determined, the location coordinates of the target sampling locations are clustered to determine the centroid positions of all foreign matter 4 after the clustering process. Specifically, as can be seen from the above description, the foreign matter 4 can generally be agglomerates or bubbles.

[0138] In one embodiment of the present invention, clustering is performed on all target sampling locations, and the clustering method includes one of meanshift algorithm, k-means clustering, hierarchical clustering, DBSCAN clustering, GMM clustering, spectral clustering or OPTICS clustering.

[0139] It is understood that the clustering algorithm used in the clustering process can be selected as needed to meet the needs of cluster analysis. The corresponding clustering methods and clustering processes of the meanshift algorithm, k-means clustering, hierarchical clustering, DBSCAN clustering, GMM clustering, spectral clustering, and OPTICS clustering can be consistent with the existing cardinality and will not be detailed here.

[0140] It should be noted that a clustering threshold should be set based on the distribution of the sampling locations and the size of the foreign matter 4 in the slurry. Subsequently, the cluster analysis method can cluster the position coordinates of the target sampling locations to determine the corresponding cluster position after clustering, where the cluster position is the centroid position of a foreign matter 4. In specific implementation, for each target sampling location, the position coordinates of the target sampling location can be determined using commonly used technical means in the art, and clustering processing can then be performed. The method and process for clustering the position coordinates of the target sampling locations can be consistent with the existing technology and will not be repeated here.

[0141] In specific implementation, the above operation is performed on each slurry target ultrasonic reflection information to obtain the centroid position of each slurry target ultrasonic reflection information corresponding to the foreign body 4. Thereafter, for any two adjacent slurry target ultrasonic reflection information, the centroid positions of the foreign bodies 4 corresponding to the two slurry target ultrasonic reflection information are compared and analyzed, as shown in FIG. Figure 2 As shown, Figure 2 In the input, two adjacent centroid position coordinates are input each time, specifically referring to the centroid positions of the foreign bodies corresponding to the ultrasonic reflection information of two adjacent slurry targets, that is, the centroid positions of the two input foreign bodies 4 should correspond to the two adjacent slurry target ultrasonic reflection information respectively.

[0142] When conducting comparative analysis, the main thing is to determine the number of continuous scans for each foreign body. Figure 2 A schematic diagram of an embodiment of the present invention for comparative analysis is shown in FIG. Figure 2It can be seen that when performing comparative analysis, comparative analysis conditions should be set. The comparative analysis conditions can be: whether the adjacent time corresponding to the two foreign objects 4 is the interval time PRI, and whether the length of the two foreign object center positions meets the comparative analysis threshold. Specifically, the comparative analysis threshold is generally related to the situation of the foreign objects 4 in the slurry. For example, the comparative analysis threshold can be set to 0.1mm. The interval time PRI can be calculated as follows. For details, please refer to the corresponding description below. It is understood that when there are multiple foreign objects 4, a corresponding comparative analysis should be performed on each foreign object 4. The comparative analysis situation can be referred to the description here.

[0143] Depend on Figure 2 It can be seen that for any foreign body 4, when it does not satisfy Figure 2 When the comparative analysis conditions shown in , the continuous scanning detection number of the current foreign body 4 is output, Figure 2 The num in is the number of continuous scan detections. Figure 2 When the comparative analysis conditions shown in , the comparative analysis should be maintained. For example, the comparative analysis is currently performed on the foreign matter 4 corresponding to the first slurry target ultrasonic reflection information and the second slurry target ultrasonic reflection information. When the comparative analysis conditions are met, the foreign matter 4 corresponding to the second slurry target ultrasonic reflection information and the third slurry target ultrasonic reflection information should be subjected to corresponding comparative analysis until the comparative analysis conditions are no longer met, and the continuous scanning detection number of each foreign matter 4 is obtained.

[0144] It should be noted that if the ultrasonic reflection information of a particular slurry target indicates that there is no foreign object 4 in the slurry, then the comparative analysis described above may determine that the comparative analysis conditions are not met. When performing real-time slurry quality testing, the above process is repeated to determine the slurry quality status. If a foreign object is present, the number of consecutive scans detected for each foreign object 4 can be determined. Thereafter, the length of the foreign object 4 can be calculated based on the number of consecutive scans detected.

[0145] In one embodiment of the present invention, when it is determined that a foreign object 4 exists in the slurry, the length of the foreign object 4 is calculated based on the time trajectory of the foreign object 4, and the following is obtained:

[0146]

[0147] Wherein, dd is the length of the foreign body 4, v is the flow rate of the slurry, num is the number of continuous scanning detections, and prf is the repetition frequency of ultrasonic waves emitted by each probe element in the ultrasonic linear array probe.

[0148] As can be seen from the above description, the quality status of the slurry can be qualitatively analyzed based on the correlation matrix of the reflected signals from each probe array element 3. When the presence of a foreign object 4 is confirmed, the size of the foreign object 4 cannot be determined. When the above foreign object status analysis process is used, the length of the foreign object 4 can be calculated based on the foreign object time trajectory.

[0149] Specifically, the frequency prf of ultrasonic waves emitted by each probe element 3 within the ultrasonic linear array probe can be determined by referring to the operation of the ultrasonic probe unit configured above. The slurry flow rate v can be measured using the velocity flow meter described above. As can be seen from the description of the foreign body status analysis process above, the number of consecutive scan detections for each foreign body 4 can be calculated after the foreign body status analysis process. As can be seen from the description above, the length of the foreign body 4 can be calculated based on the foreign body's time trajectory after the foreign body status analysis process. Generally, the length of the foreign body 4 is measured in mm.

[0150] From the above description, it can be seen that the foreign matter 4 can generally be agglomerates or bubbles. Figure 5 An embodiment of determining the length of the foreign body 4 is shown in FIG.

[0151] In summary, a real-time detection system for slurry quality includes an ultrasonic probe unit and an ultrasonic detection processing device, wherein:

[0152] Performing ultrasonic testing on the slurry using an ultrasonic probe unit to generate target ultrasonic reflection information of the slurry after scanning and testing;

[0153] The ultrasonic detection and processing device processes the ultrasonic reflection information of the slurry target using the above-mentioned detection method to determine the quality status of the slurry.

[0154] Specifically, the ultrasonic detection processing device can be a commonly used microprocessor, such as an FPGA. The type of ultrasonic detection processing device can be selected as needed, so as to be able to cooperate with the ultrasonic probe unit to detect slurry quality. The ultrasonic probe unit can be referred to in the corresponding description above. As can be seen from the above description, the ultrasonic probe unit can be used to obtain the slurry target ultrasonic reflection signal. Thereafter, the ultrasonic detection processing device can process the slurry target ultrasonic reflection information to determine the slurry quality status. The method and process for determining the slurry quality status can be referred to in the above description.

[0155] It should be noted that the ultrasonic detection and processing device can also be used to set the ultrasonic probe unit to perform ultrasonic scanning of the slurry. For example, the ultrasonic probe unit can be configured to adopt the above-mentioned vertical staggered scanning or inclined cross scanning. The specific configuration method of the ultrasonic probe unit can be consistent with the existing technology and will not be repeated here.

Claims

1. A real-time detection method for slurry quality, characterized in that: The real-time detection method comprises: The ultrasonic probe unit is configured to scan and detect the flowing slurry to generate slurry target ultrasonic reflection information after the scanning and detection, wherein: The slurry target ultrasonic reflection information includes at least m groups of slurry ultrasonic reflection signal groups, wherein the m groups of slurry ultrasonic reflection signal groups are generated by sequentially performing m ultrasonic scans on the slurry using an ultrasonic probe unit. For any slurry ultrasonic reflection signal group, the slurry ultrasonic reflection signal group includes a plurality of slurry ultrasonic reflection signals, wherein one slurry ultrasonic reflection signal is collected by one probe array element in the ultrasonic probe unit; Based on the m groups of slurry ultrasonic reflection signal groups and the generation order of the m groups of slurry ultrasonic reflection signal groups, a reflection signal phase relationship array corresponding to each probe array element is calculated, wherein, For any reflection signal correlation array, it includes (m-1)*q reflection signal correlation coefficients, where each reflection signal correlation coefficient is generated by the correlation operation of the sampling signal values ​​corresponding to two adjacent slurry ultrasonic reflection signals, and q is the number of sampling points of each slurry ultrasonic reflection signal; Determining the quality status of the slurry based on an array of reflection signal correlations of all probe array elements, wherein the quality status of the slurry includes whether there is no foreign matter in the slurry or whether there is foreign matter in the slurry; Based on the correlation array of the reflected signal of each probe array element, the quality status of the slurry is determined, including: Based on the order of generating m groups of slurry ultrasonic reflection signal groups by ultrasonic scanning, a reflection signal correlation array of the current probe array element is calculated and generated, wherein, in the reflection signal correlation array, the reflection signal correlation coefficient of each column corresponds to the same sampling position point; For the m-1 reflection signal correlation coefficients belonging to the same sampling position, when all reflection signal correlation coefficients are not lower than the reflection signal correlation coefficient threshold, it is determined that the quality status of the slurry area corresponding to the current sampling position is that there is no foreign matter in the area; For the m-1 reflection signal correlation coefficients belonging to the same sampling position, when there are n consecutive reflection signal correlation coefficients lower than the reflection signal correlation coefficient threshold, it is determined that the quality status of the slurry area corresponding to the current sampling position is that foreign matter exists in the area, where 2≤n≤m-1; Based on the correlation array of the reflected signals of all the probe array elements, when it is determined that there is a sampling position point corresponding to the slurry area whose quality status is that foreign matter exists in the area, the quality status of the slurry is determined to be that foreign matter exists in the slurry; Based on the correlation array of the reflected signals of all the probe array elements, when the quality status of the slurry area corresponding to all the sampling position points is that there is no foreign matter in the area, the quality status of the slurry is determined to be that there is no foreign matter in the slurry; Based on the correlation array of the reflected signal of each probe array element, the quality status of the slurry is determined, which also includes: For m-1 reflection signal correlation coefficients belonging to the same sampling position, if there is a reflection signal correlation coefficient lower than the reflection signal correlation coefficient threshold, and the number of reflection signal correlation coefficients that are continuously lower than the reflection signal correlation coefficient threshold is less than n, it is determined that the quality state of the slurry area corresponding to the current probe array element has interference noise; When it is determined that the quality status of the slurry area is that interference noise exists, the existing interference noise is eliminated; The repetition frequency of ultrasonic emission of each probe array element is configured so that the slurry flow distances corresponding to the signal sampling values ​​of the same sampling position points in any two adjacent slurry ultrasonic reflection signals of the probe array element are consistent.

2. The real-time detection method for slurry quality according to claim 1 is characterized in that: An ultrasonic probe unit is arranged in the conveying direction of the slurry, wherein: The ultrasonic probe unit includes two ultrasonic linear array probes, probe array elements are distributed on the ultrasonic linear array probes, and the distribution direction of the probe array elements on each ultrasonic linear array probe is perpendicular to the conveying direction of the slurry; When the quality state of the slurry area is determined to be abnormal based on the correlation array of the reflected signal of at least one probe array element, the slurry is subjected to abnormal state analysis processing. When it is determined after the abnormal state analysis processing that the abnormality in the slurry is the presence of foreign matter in the slurry, the length of the foreign matter is calculated.

3. The real-time detection method for slurry quality according to claim 2, characterized in that: When analyzing and handling abnormal conditions, the following are included: Based on the correlation array of the reflected signal of the probe array element, the correlation coefficient statistics of each sampling position point are calculated, and the correlation coefficient statistics of the probe array element are generated based on the correlation coefficient statistics of each sampling position point, where: For the reflection signal correlation coefficient of any sampling position point, when the reflection signal correlation coefficient is lower than the reflection signal correlation coefficient threshold, the correlation coefficient state identification signal corresponding to the current reflection signal correlation coefficient is configured to 1; otherwise, the correlation coefficient state identification signal corresponding to the current reflection signal correlation coefficient is configured to 0; Adding all correlation coefficient state identification signals corresponding to the same sampling position point, and taking the accumulated value of all correlation coefficient state identification signals as the correlation coefficient statistical value of the current sampling position point; Generate probe array element correlation coefficient statistics based on correlation coefficient statistics of all sampling position points; For probe element correlation coefficient statistical information of any probe element, when any correlation coefficient statistical value in the probe element correlation coefficient statistical information is not lower than the correlation coefficient statistical threshold, configuring the sampling position point corresponding to the correlation coefficient statistical value as the target sampling position point; For each slurry target ultrasonic reflection information, all target sampling position points are clustered to determine the centroid position of all foreign objects corresponding to the current slurry target ultrasonic reflection information after clustering.

4. The real-time detection method for slurry quality according to claim 3 is characterized in that: All target sampling locations are clustered, and the clustering method includes one of the meanshift algorithm, k-means clustering, hierarchical clustering, DBSCAN clustering, GMM clustering, spectral clustering or OPTICS clustering.

5. The real-time detection method for slurry quality according to claim 3 is characterized in that: For any two adjacent slurry target ultrasonic reflection information, the centroid positions of the bubbles corresponding to the two slurry target ultrasonic reflection information are compared and analyzed to determine the continuous scanning detection number of each foreign object after the comparative analysis; Based on the number of consecutive scans detected for each foreign object, the length of the foreign object is calculated, wherein, When it is determined that there is foreign matter in the slurry, the length of the foreign matter is calculated based on the time trajectory of the foreign matter, and then: Wherein, dd is the length of the foreign body, v is the flow rate of the slurry, num is the number of continuous scanning detections, and prf is the repetition frequency of ultrasonic waves emitted by each probe element in the ultrasonic linear array probe; For each probe array element transmitting ultrasonic repetition frequency prf, we have: Among them, d 异物 The detection limit size of the ultrasonic probe unit during scanning detection, d 滤芯 is the diameter of the filter element for filtering the slurry in transit, and v is the flow rate of the slurry.

6. The real-time detection method for slurry quality according to any one of claims 2 to 5, characterized in that: When two ultrasonic linear array probes are used for scanning and testing, the ultrasonic scanning modes of the probe elements in the ultrasonic linear array probes include vertical staggered scanning or oblique cross scanning.

7. A real-time detection system for slurry quality, characterized in that: It includes an ultrasonic probe unit and an ultrasonic detection processing device, wherein: Performing ultrasonic testing on the slurry using an ultrasonic probe unit to generate target ultrasonic reflection information of the slurry after scanning and testing; The ultrasonic detection and processing device processes the ultrasonic reflection information of the slurry target using the detection method described in any one of claims 1 to 6 to determine the quality status of the slurry.

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