Ultrasonic transducer pairing method and device and electrical performance test system

Abstract

The invention discloses an ultrasonic transducer pairing method and device and an electrical performance test system. The pairing method comprises the following steps: acquiring electrical performance data of a plurality of transducers to be paired at different test temperatures; the electrical performance data comprises admittance sweep frequency curve data; on the basis of all admittance sweep frequency curve data, the difference degree of all transducer pairing combinations at each test temperature is calculated; screening out candidate pairing combinations from all the transducer pairing combinations according to the difference degree and the difference degree threshold value of all the transducer pairing combinations at each test temperature; performing addition calculation on the difference degree of each candidate pairing combination at all test temperatures to obtain the total difference degree of each candidate pairing combination; and sequentially selecting the candidate pairing combination with the minimum total difference degree as a target pairing combination. The matching performance between the transducers is improved, meanwhile, the testing process is simplified, the pairing efficiency is improved, and the reliability and the stability under the actual complex working condition can be guaranteed.

Description

Technical Field

[0001] This invention relates to the field of ultrasonic transducer technology, and in particular to a pairing method, apparatus and electrical performance testing system for ultrasonic transducers. Background Technology

[0002] An ultrasonic transducer is a device that uses the piezoelectric effect of piezoelectric crystals to convert the mechanical vibrations generated by ultrasonic waves into electrical signals, or to generate mechanical vibrations under the drive of an electric field, thereby emitting ultrasonic waves. Ultrasonic measurement technology has been widely used in the flow measurement of water, gas, and heat.

[0003] In ultrasonic flow metering systems, transducers are typically used in pairs, serving as both transmitter and receiver. System performance is closely related to the parameter matching between the transducers. Mismatched transducer parameters will lead to decreased signal reception quality and increased time difference measurement errors, severely impacting the accuracy and stability of the metering results. Currently, transducer pairing often employs a simple comparison method, such as comparing the resonant frequency (Fs) of two samples. If the Fs values ​​are similar, they are directly paired. This method is crude, with vague pairing standards, making it difficult to guarantee the matching performance between transducers; thus affecting the accuracy and reliability of the final metering system.

[0004] To address the aforementioned issues, a more systematic transducer pairing test method has emerged in the prior art. This method includes: acquiring the static capacitance C0 and impedance characteristic curves of each transducer in a test pipeline under different environmental parameters (pressure and flow rate within the pipeline); determining the impedance admittance circle diagrams of the susceptance and conductance of each transducer under various environmental parameters based on the static capacitance, impedance characteristic curves, and equivalent circuit model of the transducer; and then acquiring its pairing parameters such as resonant frequency, half-power frequency, bandwidth, quality factor, dynamic resistance, dynamic capacitance, and dynamic inductance; and comparing the pairing parameters of each transducer in the transducer pairing for each environmental parameter, confirming that the pairing parameters of the two transducers are consistent only when the differences between the pairing parameters under all environmental parameters do not exceed a preset threshold.

[0005] While this method can improve pairing accuracy to some extent, its testing process is complex, requiring comprehensive judgment of multiple parameters such as resonant frequency, half-power frequency, bandwidth, quality factor, dynamic resistance, dynamic capacitance, and dynamic inductance. This results in a long testing cycle and low efficiency, hindering large-scale application in production. Furthermore, current ultrasonic transducer performance evaluations are mostly conducted at room temperature, lacking sufficient testing and verification under high and low temperature environments, making it difficult to effectively guarantee the reliability and stability of products under complex real-world operating conditions. Therefore, how to simplify the testing process, improve pairing efficiency, and ensure reliability and stability under complex real-world operating conditions while maintaining ultrasonic transducer pairing accuracy remains a pressing technical challenge. Summary of the Invention

[0006] This invention provides a pairing method, apparatus, and electrical performance testing system for ultrasonic transducers, which improves the matching accuracy between transducers, simplifies the testing process, increases pairing efficiency, and ensures reliability and stability under complex actual working conditions.

[0007] According to one aspect of the present invention, a pairing method for ultrasonic transducers is provided, comprising:

[0008] Acquire electrical performance data of multiple transducers to be paired at different test temperatures; the electrical performance data includes admittance sweep curve data;

[0009] The multiple transducers to be paired are paired in pairs to form multiple transducer pairing combinations that include all possible combinations. Based on all the admittance sweep curve data, the difference degree of each transducer pairing combination at each test temperature is calculated. The difference degree is the mean absolute error after normalization.

[0010] Candidate pairings are selected from all transducer pairings based on the degree of difference and the degree of difference threshold of all transducer pairings at each test temperature; the candidate pairings are transducer pairings whose degree of difference is less than or equal to the degree of difference threshold at least at two test temperatures.

[0011] The total difference of each candidate pairing combination is obtained by summing the differences at all test temperatures.

[0012] The candidate pairings with the smallest total difference are selected sequentially as the target pairings. Transducers that have been selected into the target pairings will be removed from the candidate queue of subsequent selections.

[0013] Optionally, the electrical performance data further includes at least one of resonant frequency, static capacitance, and dynamic resistance; after sequentially selecting the candidate pairing combination with the smallest total difference as the target pairing combination, the method further includes:

[0014] Pairing verification is performed based on at least one of the resonant frequencies, static capacitance, and dynamic resistance of the two transducers in the target pairing combination.

[0015] The target pairings that pass the pairing test are identified as successfully paired transducer pairings.

[0016] Optionally, the admittance sweep curve data includes the admittance value corresponding to each sweep frequency across the entire sweep range; the step of calculating the difference in all transducer pairing combinations at each test temperature based on all the admittance sweep curve data includes:

[0017] Based on the admittance values ​​corresponding to all data points on the admittance sweep curves of the two transducers in each transducer pairing combination at each test temperature, calculate the average absolute error of the two transducers in each transducer pairing combination at each test temperature.

[0018] The mean absolute error is subjected to maximum and minimum normalization to obtain the difference in each transducer pairing combination at each test temperature.

[0019] Optionally, based on the admittance values ​​corresponding to all data points on the admittance sweep curves of the two transducers in each transducer pairing at each test temperature, the mean absolute error of the two transducers in each transducer pairing at each test temperature is calculated and determined based on the following:

[0020] ;

[0021] Where MAE is the mean absolute error, and N is the number of data points. and These represent the first two transducers in the transducer pairing combination. The admittance value corresponding to each data point;

[0022] The mean absolute error is subjected to minimum-maximum normalization, determined based on the following:

[0023] ;

[0024] in, This is an average absolute error from the set of average absolute errors of all transducer pairing combinations obtained at a test temperature. The minimum mean absolute error in the set of mean absolute errors. It is the maximum average absolute error in the set of average absolute errors.

[0025] Optionally, the step of selecting candidate pairings from all transducer pairings based on the difference and difference threshold of all transducer pairings at each test temperature includes:

[0026] Transducer pairings with a difference greater than the difference threshold at each test temperature are removed to obtain a set of candidate pairings at each test temperature.

[0027] The intersection of all candidate pairing sets at all test temperatures is taken to obtain the final candidate pairing set; the transducer pairings in the final candidate pairing set are the selected candidate pairings.

[0028] Optionally, removing transducer pairs with a difference greater than the difference threshold at each test temperature includes:

[0029] Based on the degree of difference of all transducer pairing combinations at each test temperature, obtain the degree of difference matrix table corresponding to each test temperature;

[0030] The differences greater than the difference threshold in each of the difference matrix tables are removed, so as to remove the transducer pair combinations with differences greater than the difference threshold at each test temperature.

[0031] Optionally, before sequentially selecting the candidate pairings with the smallest total difference as the target pairings, the method further includes:

[0032] Determine whether there are candidate pairings with a total difference greater than the total difference threshold. If so, remove the candidate pairings with a total difference greater than the total difference threshold.

[0033] Optionally, the step of sequentially selecting the candidate pairings with the smallest total difference as the target pairings includes:

[0034] Determine if the number of candidate pairings with the smallest total dissimilarity is greater than 1;

[0035] If not, the candidate pairing with the smallest total difference is determined as the target pairing.

[0036] If yes, then determine whether there are two candidate pairings containing the same transducer among the candidate pairings with the smallest total difference. If yes, then determine the candidate pairings with smaller differences at room temperature among the two candidate pairings containing the same transducer as the target pairings, and remove the candidate pairings with larger differences at room temperature among the two candidate pairings containing the same transducer. If no, then determine all candidate pairings with the smallest total difference as the target pairings.

[0037] Repeat the above steps until all candidate pairings have been traversed.

[0038] According to another aspect of the present invention, a mating device for an ultrasonic transducer is provided, comprising:

[0039] The data acquisition module is used to acquire electrical performance data of multiple transducers to be paired at different test temperatures; the electrical performance data includes admittance sweep curve data.

[0040] The first calculation module is used to pair the multiple transducers to be paired in pairs to form multiple transducer pairing combinations that include all possible combinations, and to calculate the difference degree of each transducer pairing combination at each test temperature based on the admittance sweep curve data; the difference degree is the mean absolute error after normalization.

[0041] A screening module is used to screen candidate pairing combinations from all transducer pairing combinations based on the degree of difference and a degree of difference threshold of all transducer pairing combinations at each test temperature; the candidate pairing combinations are transducer pairing combinations whose degree of difference is less than or equal to the degree of difference threshold at least at two test temperatures.

[0042] The second calculation module is used to sum up the differences of each candidate pairing combination at all test temperatures to obtain the total differences of each candidate pairing combination.

[0043] The target pairing combination determination module is used to sequentially select the candidate pairing combination with the smallest total difference as the target pairing combination. Transducers that have been selected into the target pairing combination will be excluded from the candidate queue of subsequent selections.

[0044] According to another aspect of the present invention, an electrical performance testing system for an ultrasonic transducer is provided, comprising a control terminal, a temperature control chamber, a channel switching control board, and an impedance analyzer; the control terminal is used to execute the pairing method for the ultrasonic transducer described in any embodiment of the present invention.

[0045] The control terminal is connected to the temperature control box, and the control terminal is used to control the temperature of the temperature control box;

[0046] The channel switching control board is located inside the temperature control box; the channel switching control board includes a control interface, a data acquisition interface, and multiple data acquisition channels; different data acquisition channels are electrically connected to different transducers; the data acquisition interface is electrically connected to the impedance analyzer; the control interface is electrically connected to the control terminal, which is used to send control commands to the channel switching control board through the control interface to control the conduction state of the data acquisition channels; the impedance analyzer is used to acquire electrical performance data of the transducers through the data acquisition interface and the conducted data acquisition channels;

[0047] The impedance analyzer is also electrically connected to the control terminal, which is also used to acquire the electrical performance data collected by the impedance analyzer.

[0048] The technical solution provided by this invention obtains the normalized mean absolute error by comparing and analyzing the admittance sweep frequency curve data of the transducers. This quantifies the overall shape similarity of the two admittance curves across the entire sweep frequency range. This ensures that the paired transducers not only have consistent resonant points but also highly coordinated electromechanical responses at all sweep frequencies within their passbands, improving the matching performance between transducers. It eliminates the need for comprehensive judgment of multiple parameters such as resonant frequency, half-power frequency, bandwidth, quality factor, dynamic resistance, dynamic capacitance, and dynamic inductance, thus simplifying the testing process and improving pairing efficiency. Furthermore, by normalizing the mean absolute error of the admittance value and using it as a screening parameter, all data are standardized to the [0, 1] interval, giving the processed data a uniform scale. This facilitates the setting of a unified and objective judgment threshold, completely changing the traditional method's reliance on empirical thresholds for "fuzzy" judgment. This achieves objectification and standardization of the pairing process, greatly improving pairing accuracy and batch consistency. In addition, by acquiring the admittance sweep curve data of the transducer at different test temperatures, and comparing and analyzing the admittance sweep curve data of the transducer measured at multiple temperatures, transducer pairings with a difference degree less than or equal to the difference degree threshold at least at two test temperatures are selected as candidate pairings. The difference degree of each candidate pairing is summed at all test temperatures, and the candidate pairings with the smallest total difference degree are selected as the target pairings. This comprehensive testing and verification under normal temperature and high and low temperature environments effectively ensures the reliability and stability of the product under actual complex working conditions.

[0049] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0050] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0051] Figure 1 This is a flowchart of a pairing method for an ultrasonic transducer provided in an embodiment of the present invention;

[0052] Figure 2 This is a structural block diagram of an electrical performance testing system for an ultrasonic transducer provided in an embodiment of the present invention;

[0053] Figure 3This is a flowchart of another ultrasonic transducer pairing method provided in an embodiment of the present invention;

[0054] Figure 4 This is a schematic diagram of the admittance sweep curves of multiple transducers at the same test temperature provided in an embodiment of the present invention;

[0055] Figure 5 This is a schematic diagram of a difference matrix table provided in an embodiment of the present invention;

[0056] Figure 6 This is a flowchart of another ultrasonic transducer pairing method provided in an embodiment of the present invention;

[0057] Figure 7 This is a flowchart illustrating the specific steps of sequentially selecting candidate pairings with the smallest total difference as target pairings, as provided in an embodiment of the present invention.

[0058] Figure 8 This is a flowchart of another ultrasonic transducer pairing method provided in an embodiment of the present invention;

[0059] Figure 9 This is a structural block diagram of a pairing device for an ultrasonic transducer provided in an embodiment of the present invention. Detailed Implementation

[0060] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0061] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0062] This invention provides a pairing method for ultrasonic transducers. Figure 1This is a flowchart of a pairing method for an ultrasonic transducer provided in an embodiment of the present invention, see reference. Figure 1 The pairing methods for ultrasonic transducers include:

[0063] S110. Obtain electrical performance data of multiple transducers to be paired at different test temperatures; the electrical performance data includes admittance sweep curve data.

[0064] Specifically, the admittance sweep curve is a curve characterizing the relationship between frequency and admittance value. The admittance sweep curve data includes the admittance value corresponding to each detection point (sweep frequency). The admittance sweep curve data can be obtained by sweeping the frequency within a preset range using an impedance analyzer in specific steps. Different test temperatures can be provided by a temperature-controlled chamber. Multiple transducers to be paired are placed in the temperature-controlled chamber, and different test temperatures are provided for the multiple transducers by controlling the temperature of the chamber. At each test temperature, the electrical performance data of multiple transducers to be paired can be collected using at least one impedance analyzer. Optionally, Figure 2 This is a structural block diagram of an electrical performance testing system for an ultrasonic transducer provided in an embodiment of the present invention. (Refer to...) Figure 2 A channel switching control board 40 can be configured, which includes a control interface 41, an acquisition interface 42, and multiple acquisition channels a. Different transducers b are electrically connected to different acquisition channels a, and the acquisition interface 42 is electrically connected to the impedance analyzer 20. After receiving a control command from the control terminal 10, the control interface 41 of the channel switching control board 40 activates the corresponding acquisition channel a, enabling the impedance analyzer 20 to acquire the electrical performance data of the transducer b electrically connected to that acquisition channel a. By sequentially switching different acquisition channels a on, the electrical performance data of different transducers b can be acquired, thereby enabling the acquisition of electrical performance data of multiple transducers b to be paired at different test temperatures.

[0065] The test temperatures include room temperature, at least one high temperature above room temperature, and at least one low temperature below room temperature. Multiple transducers b to be paired can be from the same batch. Transducers b from the same batch can be understood as using the same batch of piezoelectric ceramic materials, the same acoustic matching layer and backing materials, and being manufactured under nearly identical process parameters, equipment conditions, and time periods. This ensures that the transducers b to be paired have a high degree of similarity in physical structure, material properties, and initial electromechanical performance. This provides a pool of candidate transducers with minimal differences for subsequent precision electrical performance pairing, effectively improving the pairing success rate and accuracy of the transducers b.

[0066] S120. Pair multiple transducers to be paired in pairs to form multiple transducer pairing combinations that include all possible combinations. Based on all admittance sweep frequency curve data, calculate the difference of each transducer pairing combination at each test temperature. The difference is the mean absolute error after normalization.

[0067] Specifically, every two transducers b in a plurality of transducers b to be paired are paired, thus forming multiple transducer pairing combinations that include all possible combinations. Based on the admittance sweep curve data obtained from the two transducers b in a transducer pairing combination at the same test temperature, the mean absolute error of the admittance value between the two transducers b in that transducer pairing combination at that test temperature can be calculated. Therefore, based on the admittance sweep curve data of all transducers b obtained at a test temperature, the mean absolute error of the admittance value calculated according to the transducer pairing combinations can be obtained, thus yielding the mean absolute error of all transducer pairing combinations at that test temperature. The difference is the normalized mean absolute error. After obtaining the mean absolute error of all transducer pairing combinations at a test temperature, the mean absolute error of all transducer pairing combinations at that test temperature is normalized to obtain the difference of all transducer pairing combinations at that test temperature.

[0068] By comparing and analyzing the admittance sweep frequency curves of the two transducers b in each transducer pairing combination, the normalized mean absolute error is obtained. This normalized mean absolute error quantifies the overall shape similarity of the admittance sweep frequency curves of the two transducers b in the transducer pairing combination across the entire sweep frequency range. The smaller the difference, the higher the similarity, i.e., the higher the matching degree; the larger the difference, the lower the similarity, i.e., the lower the matching degree. By using the normalized mean absolute error as a pairing screening parameter, it can be ensured that the two transducers b in the obtained target pairing combination not only have the same resonant point, but also have highly coordinated electromechanical responses at all sweep frequencies within their passband, thus improving the matching performance between transducers. Moreover, by using the value obtained by normalizing the mean absolute error of the admittance value as a pairing screening parameter, all mean absolute errors obtained at each test temperature can be normalized to the [0, 1] interval, making the processed data have a uniform scale.

[0069] S130. Based on the difference degree and difference threshold of all transducer pairing combinations at each test temperature, candidate pairing combinations are selected from all transducer pairing combinations; the candidate pairing combinations are transducer pairing combinations whose difference degree is less than or equal to the difference threshold at least at two test temperatures.

[0070] Specifically, the step of selecting candidate pairings from all transducer pairings based on the difference degree and difference degree threshold of all transducer pairings at each test temperature includes two rounds of screening. The first round of screening removes transducer pairings with a difference degree greater than the difference degree threshold at each test temperature to obtain a set of candidate pairings at each test temperature. The second round of screening selects transducer pairings that exist in the set of candidate pairings at at least two test temperatures as candidate pairings.

[0071] Transducer pairings with a difference greater than a difference threshold at each test temperature are removed to obtain a set of candidate pairings for each test temperature. The difference thresholds for different test temperatures can be the same or different. In this embodiment of the invention, the difference thresholds for different test temperatures are set to be the same, ensuring that the selected target pairings have the same pairing criteria at different test temperatures. This further effectively guarantees the reliability and stability of the selected target pairings under actual complex operating conditions.

[0072] By removing transducer pairings with differences exceeding a threshold at each test temperature, a high degree of matching is ensured for the selected transducer pairings at each test temperature. Transducer pairings existing in the candidate pairing set at at least two test temperatures are then selected as candidate pairings, ensuring that these candidate pairings meet the requirement of consistent matching performance at at least two test temperatures.

[0073] S140. Sum the differences of each candidate pairing at all test temperatures to obtain the total difference of each candidate pairing.

[0074] S150. Select the candidate pairings with the smallest total difference as the target pairings in sequence. Transducers that have been selected into the target pairings will be removed from the candidate queue of subsequent selections.

[0075] Specifically, by calculating the sum of the differences between candidate pairings across all test temperatures, the candidate pairings with the smallest total differences are selected as the target pairings. This allows for the selection of the pairings with the most stable performance and best consistency across the entire operating temperature range, ensuring the consistency of all target pairings across a wide temperature range. Furthermore, by setting a crucial step of removing transducers b selected for target pairings from the subsequent candidate queue, it is ensured that each transducer b is assigned to exactly one target pairing. This mechanism eliminates resource conflicts at the algorithmic level, achieving complete coverage and non-overlapping pairings, making automated, large-scale, and precise pairing possible, significantly improving production efficiency and reliability.

[0076] The ultrasonic transducer pairing method provided by this invention obtains the normalized mean absolute error by comparing and analyzing the admittance sweep frequency curve data of the transducers. This quantifies the overall shape similarity of the two admittance curves across the entire sweep frequency range, ensuring that paired transducers not only have consistent resonant points but also highly coordinated electromechanical responses at all frequencies within their passbands. This improves the matching performance between transducers and eliminates the need for comprehensive judgment of multiple parameters such as resonant frequency, half-power frequency, bandwidth, quality factor, dynamic resistance, dynamic capacitance, and dynamic inductance, thus simplifying the testing process and improving pairing efficiency. Furthermore, by normalizing the mean absolute error of the admittance value and using it as a screening parameter, all data are standardized to the [0, 1] interval, giving the processed data a uniform scale. The calculated error (mean absolute error) is limited to a clear and fixed range, facilitating the setting of a unified and objective judgment threshold. This completely changes the traditional method's reliance on empirical thresholds for "fuzzy" judgment, achieving objectivity and standardization in the pairing process and greatly improving pairing accuracy and batch consistency. In addition, by acquiring the admittance sweep curve data of the transducer at different test temperatures, and comparing and analyzing the admittance sweep curve data of the transducer measured at multiple temperatures, transducer pairings with a difference degree less than or equal to the difference degree threshold at least at two test temperatures are selected as candidate pairings. The difference degree of each candidate pairing is summed at all test temperatures, and the candidate pairings with the smallest total difference degree are selected as the target pairings. This comprehensive testing and verification under normal temperature and high and low temperature environments effectively ensures the reliability and stability of the product under actual complex working conditions.

[0077] Figure 3 This is a flowchart of another ultrasonic transducer pairing method provided in an embodiment of the present invention, see reference. Figure 3 The pairing methods for ultrasonic transducers include:

[0078] S210. Obtain electrical performance data of multiple transducers to be paired at different test temperatures; the electrical performance data includes admittance sweep curve data.

[0079] Specifically, each transducer b to be paired can be numbered. For example, if there are 8 transducers b to be paired in the current batch, they can be numbered 1, 2, 3, 4, 5, 6, 7, and 8. The 8 transducers b are tested at five different temperatures, such as -25℃, -10℃, 20℃, 40℃, and 55℃, to obtain the admittance sweep curves for the 8 transducers b at -25℃, -10℃, 20℃, 40℃, and 55℃. (Reference) Figure 4An example is shown of the admittance sweep curves of eight transducers b at -25°C. Among them, admittance sweep curve L1 is the admittance sweep curve of transducer b numbered 1, admittance sweep curve L2 is the admittance sweep curve of transducer b numbered 2, admittance sweep curve L3 is the admittance sweep curve of transducer b numbered 3, and so on. Admittance sweep curves L4 to L8 are the admittance sweep curves numbered 4, 5, 6, 7, and 8, respectively.

[0080] Different admittance sweep curves are obtained by sweeping measurements at the same pace within the same sweeping frequency range. Therefore, the number of data points (coordinate points determined by the coordinate values ​​of the sweeping frequency and the corresponding admittance values) on different admittance sweep curves is the same, and the frequencies of data points with the same order are the same. For example, the frequency corresponding to the i-th data point on the admittance sweep curve of transducer number 1 is the same as the frequency corresponding to the i-th data point on the admittance sweep curve of transducer number 2. The admittance sweep curve data includes the admittance value corresponding to each sweeping frequency within the entire sweeping frequency range.

[0081] S220. Pair multiple transducers to be paired in pairs to form multiple transducer pairing combinations that include all possible combinations.

[0082] Specifically, pairing the 8 transducers to be paired results in 28 transducer pairing combinations, namely: transducer pairing combination (1,2), transducer pairing combination (1,3), transducer pairing combination (1,4), transducer pairing combination (1,5), transducer pairing combination (1,6), transducer pairing combination (1,7), transducer pairing combination (1,8), transducer pairing combination (2,3), transducer pairing combination (2,4), transducer pairing combination (2,5), transducer pairing combination (2,6), transducer pairing combination (2,7), and transducer pairing group. The transducer pairings are (2,8), (3,4), (3,5), (3,6), (3,7), (3,8), (4,5), (4,6), (4,7), (4,8), (5,6), (5,7), (5,8), (6,7), (6,8), and (7,8).

[0083] S230. Based on the admittance values ​​corresponding to all data points on the admittance sweep curves of the two transducers in each transducer pairing combination at each test temperature, calculate the average absolute error of the two transducers in each transducer pairing combination at each test temperature.

[0084] Specifically, based on the admittance values ​​corresponding to all data points on the admittance sweep curves of the two transducers in each transducer pairing at each test temperature, the mean absolute error of the two transducers in each transducer pairing at each test temperature is calculated based on the following determination:

[0085] ;

[0086] Where MAE is the mean absolute error and N is the number of data points. and These represent the first two transducers in the transducer pairing combination. The admittance value corresponding to the nth data point, i.e. the nth The admittance value of each sweep frequency.

[0087] S240. Perform maximum and minimum normalization on the mean absolute error to obtain the difference in the pairing of each transducer at each test temperature.

[0088] Specifically, the mean absolute error is normalized to its minimum and maximum values ​​based on the following determinations:

[0089] ;

[0090] in, The difference is the value obtained after performing maximum-minimum normalization on the mean absolute error. This is an average absolute error from the set of average absolute errors of all transducer pairing combinations obtained at a test temperature. The smallest mean absolute error in the set of mean absolute errors. It represents the maximum mean absolute error in the set of mean absolute errors.

[0091] For example, taking test temperatures including -25℃, -10℃, 20℃, 40℃, and 55℃ as examples, based on the above mean absolute error formula, the mean absolute error corresponding to each of the above 28 transducer pairing combinations at -25℃, at -10℃, at 20℃, at 40℃, and at 55℃ can be obtained.

[0092] Based on the aforementioned maximum-minimum normalization formula, the mean absolute error at each test temperature is processed using maximum-minimum normalization to obtain the difference degree of all transducer pairing combinations at each test temperature. Specifically, the difference degree corresponding to each of the above 28 transducer pairing combinations is obtained at -25℃, at -10℃, at 20℃, at 40℃, and at 55℃.

[0093] S250. Remove transducer pairings with a difference greater than the difference threshold at each test temperature to obtain a set of candidate pairings at each test temperature.

[0094] S260. Take the intersection of all candidate pairing sets for test temperatures to obtain the final candidate pairing set; the transducer pairings in the final candidate pairing set are the selected candidate pairings.

[0095] Specifically, the step of selecting candidate pairings from all transducer pairings based on the degree of difference and the degree of difference threshold at each test temperature may include: removing transducer pairings with a degree of difference greater than the degree of difference threshold at each test temperature to obtain a set of candidate pairings at each test temperature; taking the intersection of the sets of candidate pairings at all test temperatures to obtain the final set of candidate pairings. Transducer pairings existing in the set of candidate pairings at all test temperatures are selected as candidate pairings, ensuring that the candidate pairings meet the requirement of consistent matching performance at all test temperatures.

[0096] Optionally, the step of removing transducer pairings with a difference greater than the difference threshold at each test temperature may include: obtaining a difference matrix table corresponding to each test temperature based on the difference of all transducer pairings at each test temperature; removing differences greater than the difference threshold from each difference matrix table, so as to remove transducer pairings with a difference greater than the difference threshold at each test temperature.

[0097] For example, Figure 5This is a schematic diagram of a difference matrix table provided in an embodiment of the present invention. It is an 8×8 difference matrix constructed based on the difference of all transducer pairing combinations obtained at a temperature of -25℃ (rows and columns correspond to numbers 1 to 8 respectively), with the main diagonal empty (not paired). A difference threshold is set, for example, 0.5. Values ​​greater than 0.5 in each matrix and their corresponding pairing combinations are marked as "invalid" or deleted.

[0098] By obtaining the difference matrix table corresponding to each test temperature, the complex difference data of all transducer pairings at each test temperature can be integrated into a unified and standardized data structure. The rows and columns of this matrix can clearly and visually represent the correspondence between transducer pairings, facilitating the selection of candidate pairings.

[0099] S270. Sum the differences of each candidate pairing at all test temperatures to obtain the total difference of each candidate pairing.

[0100] S280. Select the candidate pairings with the smallest total difference as the target pairings in sequence. Transducers that have been selected into the target pairings will be removed from the candidate queue of subsequent selections.

[0101] For example, Table 1 shows the obtained candidate pairing combination set, with the sum calculated at five temperature points. The smaller the sum, the better the overall pairing performance. The total difference of the candidate pairing combinations is sorted, and the candidate pairing combination with the smallest total difference is selected as the target pairing combination. For example, the sum of the pairing combination of transducers numbered 7 and 8 is 0.52, which is less than other transducer combinations, so it is selected as the target pairing combination; the next candidate pairing combination with the smallest total difference is the pairing combination of transducers numbered 3 and 5, which is selected as the target pairing combination; the next candidate pairing combination with the smallest total difference is the pairing combination of transducers numbered 1 and 2, which is selected as the target pairing combination.

[0102] Table 1. Candidate Pairing Combinations

[0103]

[0104] Figure 6 This is a flowchart of another ultrasonic transducer pairing method provided in an embodiment of the present invention, see reference. Figure 6 The pairing methods for ultrasonic transducers include:

[0105] S310. Obtain electrical performance data of multiple transducers to be paired at different test temperatures; the electrical performance data includes admittance sweep curve data.

[0106] S320. Pair multiple transducers to be paired in pairs to form multiple transducer pairing combinations that include all possible combinations. Based on all admittance sweep frequency curve data, calculate the difference of each transducer pairing combination at each test temperature. The difference is the mean absolute error after normalization.

[0107] S330. Based on the difference degree and difference threshold of all transducer pairing combinations at each test temperature, candidate pairing combinations are selected from all transducer pairing combinations; the candidate pairing combinations are transducer pairing combinations whose difference degree is less than or equal to the difference threshold at all test temperatures.

[0108] S340. Sum the differences of each candidate pairing at all test temperatures to obtain the total difference of each candidate pairing.

[0109] S350: Remove candidate pairings whose total difference is greater than the total difference threshold.

[0110] S360. Select the candidate pairing combination with the smallest total difference as the target pairing combination in turn. Transducers that have been selected into the target pairing combination will be removed from the candidate queue of subsequent selections.

[0111] In the technical solution provided by this invention, before sequentially selecting the candidate pairing combination with the smallest total difference as the target pairing combination, the method further includes: determining whether there are candidate pairing combinations with a total difference greater than a total difference threshold. If so, the candidate pairing combinations with a total difference greater than the total difference threshold are removed, and a third screening is performed. That is, the determination of the candidate pairing combination has undergone at least three screenings. The total difference threshold can be set according to actual needs. For example, the total difference threshold can be determined based on the number of test temperatures and the difference threshold corresponding to each test temperature. The total difference threshold can be selected as a value less than the sum of the difference thresholds corresponding to each test temperature. For example, referring to Table 1, the total difference threshold can be 1.8, then transducer pairing combinations (2, 7), (2, 8), (3, 7), and (3, 8) in the table are removed. The technical solution provided by this invention, by removing candidate pairing combinations with a total difference greater than the total difference threshold, can further ensure the pairing consistency of the finally obtained target transducer pairing combination within a wide temperature range.

[0112] Based on the above embodiments, optionally, refer to... Figure 7 The specific steps of selecting the candidate pairing combination with the smallest total difference as the target pairing combination in steps S150, S280, and S360 may include:

[0113] S10. Obtain the number of candidate pairings with the smallest current total difference.

[0114] S20. Determine whether the number of candidate pairings with the smallest total difference is greater than 1; if not, proceed to step S30; if yes, proceed to step S40.

[0115] S30. Determine the candidate pairing with the smallest total difference as the target pairing and proceed to step S70.

[0116] S40. Determine whether there are two candidate pairings containing the same transducer among all candidate pairings with the smallest total difference. If yes, proceed to step S50; otherwise, proceed to step S60.

[0117] S50. The candidate pairing combination with a small difference between two candidate pairing combinations containing the same transducer at room temperature is determined as the target pairing combination, and the candidate pairing combination with a large difference between two candidate pairing combinations containing the same transducer at room temperature is removed.

[0118] S60. Determine all candidate pairings with the smallest current total difference as target pairings and proceed to step S70.

[0119] S70. Determine whether all candidate pairings have been traversed. If not, proceed to step S80; if yes, proceed to step S90.

[0120] S80. Determine the number of candidate pairings with the smallest total difference in the next step, replace the number of candidate pairings with the smallest total difference in the next step with the number of candidate pairings with the smallest total difference in the current step, and return to step S10.

[0121] S90. Determine the target pairing combination.

[0122] The technical solution provided in this invention determines whether the number of candidate pairings with the smallest total difference is greater than 1. If so, it further determines whether there are two candidate pairings containing the same transducer among the candidate pairings with the smallest total difference. If so, it determines the candidate pairings with smaller differences at room temperature among the two candidate pairings containing the same transducer as the target pairings, and removes the candidate pairings with larger differences at room temperature among the two candidate pairings containing the same transducer. This ensures that when multiple optimal pairings are tied for first place, the pairing algorithm can automatically and reliably provide a unique solution, greatly improving the robustness and practicality of the method.

[0123] Based on the above embodiments, optionally, Figure 8This is a flowchart of another ultrasonic transducer pairing method provided in an embodiment of the present invention, see reference. Figure 8 The pairing methods for ultrasonic transducers include:

[0124] S410. Obtain electrical performance data of multiple transducers to be paired at different test temperatures; the electrical performance data includes admittance sweep curve data.

[0125] S420. Pair multiple transducers to be paired in pairs to form multiple transducer pairing combinations that include all possible combinations. Based on all admittance sweep frequency curve data, calculate the difference of each transducer pairing combination at each test temperature. The difference is the mean absolute error after normalization.

[0126] S430. Based on the difference degree and difference threshold of all transducer pairing combinations at each test temperature, candidate pairing combinations are selected from all transducer pairing combinations; the candidate pairing combinations are transducer pairing combinations whose difference degree is less than or equal to the difference threshold at all test temperatures.

[0127] S440. Sum the differences of each candidate pairing at all test temperatures to obtain the total difference of each candidate pairing.

[0128] S450: Remove candidate pairings whose total difference is greater than the total difference threshold.

[0129] S460. Select the candidate pairing combination with the smallest total difference as the target pairing combination in turn. Transducers that have been selected into the target pairing combination will be removed from the candidate queue of subsequent selections.

[0130] S470. A pairing test is performed based on at least one of the resonant frequencies, static capacitance, and dynamic resistance of the two transducers in the target pairing combination; the electrical performance data also includes at least one of the resonant frequencies, static capacitance, and dynamic resistance.

[0131] S480. The target pairing combination that passes the pairing test is determined as a successfully paired transducer pairing combination.

[0132] Specifically, after determining the target pairing combination set, a pairing test is performed on each target pairing combination in the set. During the pairing test, the pairing test can be performed based on at least one of the resonant frequencies, static capacitance, and dynamic resistance of the two transducers in the target pairing combination. Alternatively, when performing the pairing test based on at least one of the resonant frequencies, static capacitance, and dynamic resistance of the two transducers in the target pairing combination at a single test temperature (e.g., room temperature), the pairing test can also be performed based on at least one of the resonant frequencies, static capacitance, and dynamic resistance of the two transducers in the target pairing combination at multiple test temperatures.

[0133] Table 2. Difference detection table of Fs, C0, and R1 for each target pairing combination.

[0134]

[0135] For example, Table 2 shows the difference test results for the resonant frequency Fs, static capacitance C0, and dynamic resistance R1 of the two transducers b in the target pairing combination at a temperature of -25℃. The requirements are that the difference ratio of the resonant frequency Fs of the two transducers b in the target pairing combination is within ±1.5%, the difference ratio of the static capacitance C0 of the two transducers is within ±5%, and the difference ratio of the dynamic resistance R1 of the two transducers is within ±15%. The data shows that at a temperature of -25℃, all three pairs of transducers meet the difference test requirements and pass the test at -25℃.

[0136] Similar difference detection tables will be obtained for other test temperatures. Under all test temperatures, if the difference ratios of the resonant frequency Fs, static capacitance C0, and dynamic resistance R1 of the two transducers in a target pairing all meet their respective difference ratio ranges, then the target pairing is determined to be a successfully paired transducer pairing. Optionally, based on the above embodiments, transducers that do not pair successfully will proceed to the next batch of pairing processes.

[0137] In the ultrasonic transducer pairing method provided in this embodiment of the invention, the electrical performance data further includes at least one of resonant frequency, static capacitance, and dynamic resistance. After sequentially selecting the candidate pairing combination with the smallest total difference as the target pairing combination, the method further includes: performing a pairing test based on at least one of the resonant frequency, static capacitance, and dynamic resistance of the two transducers in the target pairing combination; the target pairing combination that passes the pairing test is determined as a successfully paired transducer pairing combination, which can further improve the matching performance between transducers while ensuring reliability and stability under actual complex working conditions.

[0138] The ultrasonic transducer pairing method provided in any embodiment of the present invention can be applied to the pairing of transducers in flow measurement of liquids (e.g., water), gases (e.g., fuel gas), and heat.

[0139] This invention also provides a pairing device for an ultrasonic transducer. Figure 9 This is a structural block diagram of a pairing device for an ultrasonic transducer provided in an embodiment of the present invention. (Refer to...) Figure 9 The pairing device for the ultrasonic transducer includes:

[0140] The data acquisition module 110 is used to acquire electrical performance data of multiple transducers to be paired at different test temperatures; the electrical performance data includes admittance sweep curve data.

[0141] The first calculation module 120 is used to pair multiple transducers to be paired in pairs to form multiple transducer pairing combinations containing all possible combinations, and to calculate the difference degree of each transducer pairing combination at each test temperature based on the admittance sweep frequency curve data; the difference degree is the mean absolute error after normalization.

[0142] The screening module 130 is used to screen candidate pairing combinations from all transducer pairing combinations based on the difference degree and difference threshold of all transducer pairing combinations at each test temperature; the candidate pairing combination is a transducer pairing combination whose difference degree is less than or equal to the difference threshold at least at two test temperatures.

[0143] The second calculation module 140 is used to sum up the differences of each candidate pairing combination at all test temperatures to obtain the total differences of each candidate pairing combination.

[0144] The target pairing combination determination module 150 is used to sequentially select the candidate pairing combination with the smallest total difference as the target pairing combination, wherein the transducers that have been selected into the target pairing combination will be excluded from the candidate queue of subsequent selections.

[0145] The ultrasonic transducer pairing device provided in the embodiments of the present invention can execute the ultrasonic transducer pairing method provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the method.

[0146] This invention also provides an electrical performance testing system for ultrasonic transducers, as described in the following embodiments. Figure 2 The electrical performance testing system for ultrasonic transducers includes a control terminal 10, a temperature control box 30, a channel switching control board 40, and an impedance analyzer 20. The control terminal 10 includes a pairing device for ultrasonic transducers as described in any embodiment of the present invention, and the control terminal 10 is used to execute the pairing method for ultrasonic transducers as described in any embodiment of the present invention.

[0147] Among them, the control terminal 10 is connected to the temperature control box 30, and the control terminal 10 is used to control the temperature of the temperature control box 30;

[0148] The channel switching control board 40 is located inside the temperature control box 30. The channel switching control board 40 includes a control interface 41, a data acquisition interface 42, and multiple data acquisition channels a. Different data acquisition channels a are electrically connected to different transducers b. The data acquisition interface 42 is electrically connected to the impedance analyzer 20. The control interface 41 is electrically connected to the control terminal 10. The control terminal 10 is used to send control commands to the channel switching control board 40 through the control interface 41 to control the conduction state of the data acquisition channels. The impedance analyzer 20 is used to acquire the electrical performance data of the transducers through the data acquisition interface 42 and the conducted data acquisition channels a. Each data acquisition channel a may include a relay, and the conduction and disconnection of the data acquisition channel a are controlled by controlling the relay.

[0149] The impedance analyzer 20 is also electrically connected to the control terminal 10, which is used to control the impedance analyzer 20 to collect the electrical performance data of the transducer and to acquire the electrical performance data collected by the impedance analyzer 20.

[0150] This testing system can perform electrical performance testing on batches of ultrasonic transducers. The operating instructions for the testing system are as follows:

[0151] A1. The control terminal 10 controls the temperature control box 30 to reach the first preset temperature value (e.g., -25℃) through the temperature control box control interface 31, and maintains the temperature at this preset temperature for a preset time (e.g., 2 hours).

[0152] A2. After the constant temperature preset time, the control terminal 10 controls the channel switching control board 40 through the control interface 41 of the channel switching control board 40, so that the acquisition interface 42 is connected to the first acquisition channel a, thus completing the connection between the impedance analyzer 20 and the first ultrasonic transducer b.

[0153] A3. The control terminal 10 controls the impedance analyzer 20 to test the ultrasonic transducer 1 and obtain test parameters such as admittance sweep curve data, resonant frequency Fs, static capacitance C0, and dynamic resistance R1.

[0154] A4. When the first transducer b is tested, the control terminal 10 controls the channel switching control board 40 to switch the second acquisition channel a to conduct, and performs electrical performance testing on the second ultrasonic transducer b. This process is repeated to complete the testing of all the ultrasonic transducers to be tested.

[0155] A5. After all transducers have been tested at the first preset temperature (e.g., -25℃), the control terminal 10 controls the temperature control box through the temperature control box control interface to reach the second preset temperature (e.g., -10℃), and holds the temperature at this temperature for a preset time. Repeat steps A2 to A4 above to complete the testing of all the ultrasonic transducers to be tested.

[0156] By analogy, complete the electrical performance test data of a batch of ultrasonic transducers at all test temperatures.

[0157] After completing the electrical performance test data of the batch of ultrasonic transducers at all test temperatures, the control terminal 10 executes the ultrasonic transducer pairing method described in any embodiment of this method to complete the pairing of the ultrasonic transducers.

[0158] Compared to the manual testing of single ultrasonic transducers in related technologies, the technical solution provided in this invention, based on an electrical performance testing system for ultrasonic transducers, can perform electrical performance testing on batches of ultrasonic transducers, thus improving the testing efficiency of ultrasonic transducer electrical performance.

[0159] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A pairing method for ultrasonic transducers, characterized in that, include: Acquire electrical performance data of multiple transducers to be paired at different test temperatures; the electrical performance data includes admittance sweep curve data; The multiple transducers to be paired are paired in pairs to form multiple transducer pairing combinations that include all possible combinations. Based on all the admittance sweep curve data, the difference degree of each transducer pairing combination at each test temperature is calculated. The difference degree is the mean absolute error after normalization. Candidate pairings are selected from all transducer pairings based on the degree of difference and the degree of difference threshold of all transducer pairings at each test temperature; the candidate pairings are transducer pairings whose degree of difference is less than or equal to the degree of difference threshold at least at two test temperatures. The total difference of each candidate pairing combination is obtained by summing the differences at all test temperatures. The candidate pairings with the smallest total difference are selected sequentially as the target pairings. Transducers that have been selected into the target pairings will be removed from the candidate queue of subsequent selections.

2. The pairing method for ultrasonic transducers according to claim 1, characterized in that, The admittance sweep curve data includes the admittance value corresponding to each sweep frequency across the entire sweep range; based on all the admittance sweep curve data, the difference in all transducer pairing combinations at each test temperature is calculated, including: Based on the admittance values ​​corresponding to all data points on the admittance sweep curves of the two transducers in each transducer pairing combination at each test temperature, calculate the average absolute error of the two transducers in each transducer pairing combination at each test temperature. The mean absolute error is subjected to maximum and minimum normalization to obtain the difference in each transducer pairing combination at each test temperature.

3. The pairing method for ultrasonic transducers according to claim 2, characterized in that, Based on the admittance values ​​corresponding to all data points on the admittance sweep curves of the two transducers in each transducer pairing at each test temperature, the mean absolute error of the two transducers in each transducer pairing at each test temperature is calculated based on the following determination: ； Where MAE is the mean absolute error, and N is the number of data points. and These represent the first two transducers in the transducer pairing combination. The admittance value corresponding to each data point; The mean absolute error is subjected to minimum-maximum normalization, determined based on the following: ； in, This is an average absolute error from the set of average absolute errors of all transducer pairing combinations obtained at a test temperature. The minimum mean absolute error in the set of mean absolute errors. It is the maximum average absolute error in the set of average absolute errors.

4. The pairing method for ultrasonic transducers according to claim 1, characterized in that, The process of selecting candidate pairings from all transducer pairings based on the difference and difference threshold of all transducer pairings at each test temperature includes: Transducer pairings with a difference greater than the difference threshold at each test temperature are removed to obtain a set of candidate pairings at each test temperature. The intersection of all candidate pairing sets at all test temperatures is taken to obtain the final candidate pairing set; the transducer pairings in the final candidate pairing set are the selected candidate pairings.

5. The pairing method for ultrasonic transducers according to claim 4, characterized in that, The step of removing transducer pairs with a difference greater than the difference threshold at each test temperature includes: Based on the degree of difference of all transducer pairing combinations at each test temperature, obtain the degree of difference matrix table corresponding to each test temperature; The differences greater than the difference threshold in each of the difference matrix tables are removed, so as to remove the transducer pair combinations with differences greater than the difference threshold at each test temperature.

6. The pairing method for ultrasonic transducers according to claim 1, characterized in that, The step of sequentially selecting the candidate pairings with the smallest total difference as the target pairings includes: Determine if the number of candidate pairings with the smallest total dissimilarity is greater than 1; If not, the candidate pairing with the smallest total difference is determined as the target pairing. If yes, then determine whether there are two candidate pairings containing the same transducer among the candidate pairings with the smallest total difference. If yes, then determine the candidate pairings with smaller differences at room temperature among the two candidate pairings containing the same transducer as the target pairings, and remove the candidate pairings with larger differences at room temperature among the two candidate pairings containing the same transducer. If no, then determine all candidate pairings with the smallest total difference as the target pairings. Repeat the above steps until all candidate pairings have been traversed.

7. The pairing method for ultrasonic transducers according to claim 6, characterized in that, Before sequentially selecting the candidate pairings with the smallest total difference as the target pairings, the process also includes: Determine whether there are candidate pairings with a total difference greater than the total difference threshold. If so, remove the candidate pairings with a total difference greater than the total difference threshold.

8. The pairing method for ultrasonic transducers according to any one of claims 1 to 7, characterized in that, The electrical performance data also includes at least one of resonant frequency, static capacitance, and dynamic resistance; after sequentially selecting the candidate pairing combination with the smallest total difference as the target pairing combination, the following is also included: Pairing verification is performed based on at least one of the resonant frequencies, static capacitance, and dynamic resistance of the two transducers in the target pairing combination. The target pairings that pass the pairing test are identified as successfully paired transducer pairings.

9. A pairing device for an ultrasonic transducer, characterized in that, include: The data acquisition module is used to acquire electrical performance data of multiple transducers to be paired at different test temperatures; the electrical performance data includes admittance sweep curve data. The first calculation module is used to pair the multiple transducers to be paired in pairs to form multiple transducer pairing combinations that include all possible combinations, and to calculate the difference degree of each transducer pairing combination at each test temperature based on the admittance sweep curve data; the difference degree is the mean absolute error after normalization. A screening module is used to screen candidate pairing combinations from all transducer pairing combinations based on the degree of difference and a degree of difference threshold of all transducer pairing combinations at each test temperature; the candidate pairing combinations are transducer pairing combinations whose degree of difference is less than or equal to the degree of difference threshold at least at two test temperatures. The second calculation module is used to sum up the differences of each candidate pairing combination at all test temperatures to obtain the total differences of each candidate pairing combination. The target pairing combination determination module is used to sequentially select the candidate pairing combination with the smallest total difference as the target pairing combination. Transducers that have been selected into the target pairing combination will be excluded from the candidate queue of subsequent selections.

10. An electrical performance testing system for an ultrasonic transducer, characterized in that, It includes a control terminal, a temperature control box, a channel switching control board, and an impedance analyzer; the control terminal is used to execute the pairing method of the ultrasonic transducer according to any one of claims 1 to 8; The control terminal is connected to the temperature control box, and the control terminal is used to control the temperature of the temperature control box; The channel switching control board is located inside the temperature control box; the channel switching control board includes a control interface, a data acquisition interface, and multiple data acquisition channels; different data acquisition channels are electrically connected to different transducers; the data acquisition interface is electrically connected to the impedance analyzer; the control interface is electrically connected to the control terminal, which is used to send control commands to the channel switching control board through the control interface to control the conduction state of the data acquisition channels; the impedance analyzer is used to acquire electrical performance data of the transducers through the data acquisition interface and the conducted data acquisition channels; The impedance analyzer is also electrically connected to the control terminal, which is also used to acquire the electrical performance data collected by the impedance analyzer.

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