A method and apparatus for measuring the amplitude of the liquid level in a pulse extraction column

Abstract

This invention discloses a method and apparatus for measuring the liquid level amplitude of a pulse extraction column. The method includes: at a test bench, selecting either ultrasonic or direct measurement of the liquid level amplitude of the pulse extraction column, recording the amplitude measurement results and their corresponding adjustable factors, forming a coordinate point set Y; and using the air blowing method to measure the liquid level amplitude of the pulse extraction column under the same conditions, recording the amplitude measurement results and their corresponding adjustable factors, forming a coordinate point set X; calculating the relationship between Y and X to obtain the transformation matrix M from X to Y; in actual engineering, using the air blowing method to measure the liquid level amplitude of the pulse extraction column, and recording the amplitude measurement results and their corresponding adjustable factors, forming a coordinate point set X1; and calculating the pulse extraction column amplitude in actual engineering based on the transformation matrix M and X1. This invention can optimize the results of existing air blowing methods for measuring pulse extraction columns, reducing interference from various factors in the measurement environment and reducing amplitude measurement errors.

Description

Technical Field

[0001] This invention belongs to the field of spent fuel reprocessing technology, specifically relating to a method and apparatus for measuring the liquid level amplitude of a pulse extraction column. Background Technology

[0002] Non-contact measurement technology is the most critical parameter measurement technology in reprocessing engineering applications. In the spent fuel reprocessing process, purging instruments are widely used to solve the detection problems of parameters such as liquid level signal, density, interface, and column weight of highly radioactive liquids through the purging method.

[0003] As a crucial extraction and separation device, the pulse extraction column is subject to numerous influencing factors and harsh measurement environments. Therefore, ensuring the accuracy of column amplitude measurement and control during production is paramount. According to current records on pulse extraction column amplitude measurement, the amplitude is affected by various factors, including pulse gas pressure, frequency, sieve plate structural parameters, column structural characteristics, and the physical properties of the two-phase fluids, such as flow velocity. In operation, the pulse frequency is adjusted by regulating the rotary valve's rotation speed using a frequency converter, while the pulse amplitude is regulated by adjusting the pulse gas pressure.

[0004] like Figure 4 , 5 As shown, the currently used air-blowing method first derives the measurement model of the pulse extraction column theoretically, deducing the influence factors of the flow channel, the conversion relationship between the pulse leg and the extraction column amplitude, etc., and then obtains relevant empirical formulas by substituting experimental data. During measurement, the corresponding change is generated by measuring the instantaneous pressure drop change value generated in a single cycle, and the amplitude change in a single cycle is obtained by substituting it into the empirical formula. This measurement method has at least the following shortcomings: the liquid level is affected by oscillation, increasing the error, and there is a lag between the measured amplitude and the actual amplitude; at the same time, under air-blowing conditions, there is a deviation between the apparent amplitude and the true amplitude in the pulse leg, causing the measured pulse leg amplitude to not directly correspond to the actual amplitude in the pulse extraction column. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to address the above-mentioned shortcomings of the prior art by providing a method and apparatus for measuring the liquid level amplitude of a pulse extraction column, which can optimize the results of the existing air blowing method for measuring pulse extraction columns, reduce interference from various factors in the measurement environment, and reduce the error in amplitude measurement.

[0006] The technical solution of the present invention to solve the above-mentioned technical problems is:

[0007] According to a first aspect of the present invention, a method for measuring the level amplitude of a pulse extraction column is provided, comprising:

[0008] (1) Determine the type of pulse extraction column, sieve plate, and two-phase fluid used in actual engineering, and determine the adjustable factors of the pulse extraction column used in actual engineering.

[0009] (2) Build the bench test apparatus according to step (1) and determine the adjustable factors that need to be considered in the bench test;

[0010] (3) At the bench test site, select the ultrasonic method or directly measure the liquid level amplitude of the pulse extraction column, record the amplitude measurement results and the corresponding adjustable factor conditions, and form a coordinate point set Y; at the bench test site, use the air blowing method to measure the liquid level amplitude of the pulse extraction column under the same conditions, record the amplitude measurement results and the corresponding adjustable factor conditions, and form a coordinate point set X.

[0011] (4) Calculate the relationship between Y and X to obtain the transformation matrix M from X to Y.

[0012] (5) In actual engineering, the air blowing method is used to measure the liquid level amplitude of the pulse extraction column, and the amplitude measurement results and the corresponding adjustable factor conditions are recorded to form a coordinate point set X1;

[0013] (6) The amplitude of the pulse extraction column in the actual project is calculated by back-calculation based on the transformation matrix M and X1.

[0014] Preferably, the adjustable factor is one or more of pulse gas pressure and pulse frequency.

[0015] Preferably, step (4), calculating the relationship between Y and X to obtain the transformation matrix M from X to Y, is performed using a nonlinear regression method through calculation and iteration.

[0016] The steps include:

[0017] 101. Based on the coordinate point set Y, define a nonlinear model Y = f(X; β) + ε, where Y is the dependent variable measured by the ultrasonic method or the direct measurement method, X is the independent variable measured by the air blowing method, β is the parameter vector, ε is the nonlinear error term in the conversion between the two methods, and f is a nonlinear function. Calculate the initial value of the iteration based on the initially measured transformation matrix.

[0018] 102. Define a cost function J(β) = (1 / 2m)∑(f(xi;β)-yi)^2, where m is the number of data points, yi is the i-th observation, and f(xi;β) is the predicted value;

[0019] 103. Choose an initial parameter vector β_0 = (0, 0, ..., 0);

[0020] 104. Use Newton's method to update the parameter vector to minimize the cost function;

[0021] 105. Repeat step 104 until the parameter vector converges to a local optimum or reaches the preset number of iterations. Then, determine whether the nonlinear function f has converged. If it has converged, the corresponding function f is the transformation matrix M.

[0022] Preferably, the method further includes:

[0023] After step (4), the pulse extraction column level amplitude is measured again at the bench test site using the air blowing method. The newly measured amplitude measurement results and their corresponding adjustable factor conditions are recorded to form a coordinate point set X2. The transformed coordinate point set Y2 is calculated by back-calculation based on X2 and the transformation matrix M.

[0024] Compare Y2 with Y, calculate the error between them, and determine the reliability of the transformation matrix M based on the magnitude of the error.

[0025] According to a second aspect of the present invention, an apparatus for measuring the liquid level amplitude of a pulse extraction column is provided, comprising a test bench apparatus, a receiving module, a processing module, and a calculation module, wherein:

[0026] The test bench device is built according to actual engineering information and is used to measure the amplitude of the pulse extraction column by ultrasonic / direct measurement method and air blowing method.

[0027] The receiving module is used to acquire the set of coordinate points Y consisting of the pulse extraction column level amplitude measurement result obtained by the ultrasonic method or direct measurement method at the test bench device and the corresponding adjustable factor conditions; acquire the set of coordinate points X consisting of the pulse extraction column level amplitude measurement result obtained by the air blowing method under the same conditions and the corresponding adjustable factor conditions; and acquire the set of coordinate points X1 consisting of the pulse extraction column level amplitude measurement result obtained by the air blowing method in actual engineering and the corresponding adjustable factor conditions.

[0028] The processing module is electrically connected to the receiving module and is used to calculate the relationship between Y and X to obtain the transformation matrix M from X to Y.

[0029] The calculation module is electrically connected to the receiving module and the processing module respectively, and is used to calculate the amplitude of the pulse extraction column in actual engineering based on M and X1.

[0030] Preferably, the device further includes a verification module, which is electrically connected to the receiving module and the processing module respectively. The receiving module is also used to acquire the newly measured amplitude measurement result obtained by measuring the liquid level amplitude of the pulse extraction column again using the air blowing method, and the coordinate point set X2 composed of the corresponding adjustable factor conditions. The verification module is used to calculate the transformed coordinate point set Y2 based on X2 and the transformation matrix M, compare Y2 with Y, calculate the error between the two, and judge the reliability of the transformation matrix M based on the magnitude of the error.

[0031] According to a third aspect of the present invention, an apparatus for measuring the level amplitude of a pulse extraction column is provided, comprising a memory and a processor, wherein the memory stores a computer program and the processor is configured to run the computer program to perform steps (4) to (6) of the method for measuring the level amplitude of a pulse extraction column as described above.

[0032] Beneficial effects:

[0033] The present invention provides a method and apparatus for measuring the liquid level amplitude of a pulse extraction column. Starting with physical modeling, numerical analysis, and bench testing, it proposes a more comprehensive method for measuring the liquid level amplitude of a pulse extraction column using the blowing method. By utilizing bench testing to perform various measurements of the liquid level amplitude of a specific pulse extraction column within a range of adjustable factors, more accurate real-time data from the bench test is obtained. This data is then compared with data obtained from the bench test using the currently used blowing method, and a fitting comparison relationship (i.e., transformation matrix M) is established through numerical analysis. Furthermore, by comparing the data measured using the currently used blowing method in actual engineering with the established fitting comparison relationship, the measurement results of the blowing method can be optimized. This effectively reduces interference from various factors in the measurement environment, reduces corresponding hysteresis and amplitude measurement errors, and improves the reliability and consistency of the measurement results. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the method for measuring the liquid level amplitude of a pulse extraction column according to Embodiment 1 of the present invention;

[0035] Figure 2 This is a schematic diagram of the device for measuring the liquid level amplitude of the pulse extraction column in Embodiment 2 of the present invention;

[0036] Figure 3 This is a schematic diagram of the device for measuring the liquid level amplitude of the pulse extraction column in Embodiment 3 of the present invention;

[0037] Figure 4 This is a schematic diagram of the gas blowing method for pulse extraction columns;

[0038] Figure 5 This is a schematic diagram showing the relationship between the pulse leg and the pulse extraction column.

[0039] In the diagram: 11-Test bench device; 12-Receiving module; 13-Processing module; 14-Calculation module; 15-Verification module; 21-Memory; 22-Processor. Detailed Implementation

[0040] To enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0041] In the description of this invention, it should be noted that the terms "above" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience and simplification of the description and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0042] In the description of this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0043] Example 1

[0044] like Figure 1 As shown in the figure, this embodiment discloses a method for measuring the liquid level amplitude of a pulse extraction column, including:

[0045] (1) Determine the type of pulse extraction column, sieve plate, and two-phase fluid used in actual engineering, and determine the adjustable factors of the pulse extraction column used in actual engineering.

[0046] (2) Build the bench test device according to step (1) and determine the adjustable factors that need to be considered in the bench test.

[0047] Specifically, for example, a pulse extraction column with the appropriate diameter and height is selected based on the actual engineering project, along with the corresponding sieve plate type and two-phase fluid type, to ensure that the bench test matches the pulse extraction column used in the actual project. Adjustable factors include one or more of the following that may be related to and cause changes in the pulse extraction column amplitude, such as pulse gas pressure and pulse frequency, and corresponding measurement record tables are generated.

[0048] In this embodiment, for a given pulse extraction column, the factors affecting the amplitude of the pulse extraction column are analyzed. Pulse gas pressure and pulse frequency are preferably included as adjustable factors in the measurement results statistics to facilitate bench test design and data analysis.

[0049] (3) At the bench test site, select a relatively accurate ultrasonic method or directly measure the liquid level amplitude of the pulse extraction column (it should be noted that this method is mainly used in spent fuel reprocessing plants. The ultrasonic method or direct measurement method cannot measure the liquid phase amplitude of the pulse extraction column in the actual scenario of spent fuel reprocessing. Therefore, the existing technology often uses the air blowing method to measure the liquid phase amplitude of the pulse extraction column in the scenario of spent fuel reprocessing) to obtain the "true amplitude". Record the amplitude measurement results and their corresponding adjustable factor conditions (i.e., record the corresponding generated amplitude measurement results and match them with the adjustable corresponding factors in the pulse extraction column) to form the coordinate point set Y.

[0050] Furthermore, at the bench test site, the commonly used air blowing method was used to measure the liquid level amplitude of the pulse extraction column under the same conditions. The amplitude measurement results and their corresponding adjustable factor conditions were recorded, forming a coordinate point set X containing information on adjustable factor conditions and amplitude measurement results.

[0051] Specifically, the ultrasonic method, direct measurement method, and air blowing method are all carried out according to the conventional operating procedures of existing technologies. For example, the ultrasonic method can use an ultrasonic instrument, with an ultrasonic transmitter and receiver installed above and below the sieve plate, respectively, to measure the propagation time of ultrasonic waves in the liquid film.

[0052] During measurement, adjustable factors such as pulse pressure and pulse frequency are continuously varied according to their range of variation in actual engineering. By measuring the degree of influence of the corresponding adjustable factors on the liquid level amplitude of the pulse extraction column, a coordinate matrix (i.e., a set of coordinate points) is obtained according to the corresponding measurement method. For example, the pulse gas pressure is varied from 0.1 MPa to 0.5 MPa, changing every 0.1 MPa, and the liquid level amplitude under the corresponding pulse pressure is recorded.

[0053] (4) Calculate the relationship between Y and X to obtain the transformation matrix M from X to Y.

[0054] Specifically, the transformation matrix M can be calculated using nonlinear regression methods. By finding a set of parameters, the matrix model best describes the relationship between the dependent and independent variables. Since the matrix relationships generated from the data measured in bench tests do not have analytical solutions, numerical optimization algorithms, such as Newton's method and gradient descent, are needed to solve them.

[0055] In this embodiment, step (4) calculates the relationship between Y and X to obtain the transformation matrix M from X to Y. This is done by using a nonlinear regression method and iterating over time. The specific steps include:

[0056] 401. Based on the coordinate point set Y, define a nonlinear model Y = f(X; β) + ε, where Y is the dependent variable (i.e., coordinate point set Y) measured using the ultrasonic method or direct measurement method, X is the independent variable (i.e., coordinate point set X) measured using the air blowing method, β is the parameter vector, ε is the nonlinear error term in the conversion between the two methods, and f is a nonlinear function. Calculate the initial values ​​for iteration based on the initially measured transformation matrix.

[0057] 402. Define a cost function, for example, J(β)=(1 / 2m)∑(f(xi;β)-yi)^2, where m is the number of data points, yi is the i-th observation, and f(xi;β) is the predicted value;

[0058] 403. Choose an initial parameter vector, such as β_0 = (0, 0, ..., 0).

[0059] 404. Use an optimization algorithm, such as Newton's method, to update the parameter vector to minimize the cost function, for example, β_(k+1)=β_k-J'(β_k)^(-1)J(β_k), where J' is the gradient of the cost function and J'' is the Hessian matrix of the cost function.

[0060] 405. Repeat step 104 until the parameter vector converges to a local optimum or reaches the preset number of iterations. Then, determine whether the nonlinear function f has converged. If it has converged, the requirements are met, and the corresponding function f is the change matrix M. If it has not converged, additional measurement data is needed to regenerate the initial change matrix M, and the iteration is restarted. Furthermore, the error model has a high goodness of fit, satisfying an R² value (R² is an indicator of the goodness of fit of a regression model to data) greater than 0.9 and a p-value (P is an indicator of the significance of a regression model or regression coefficient) less than 0.05.

[0061] Since the actual measurement process may be affected by factors such as noise, interference, and error, resulting in inaccurate and unstable measurement results, the method of this embodiment continuously changes the conditions within the range of change of each adjustable factor in step (3) and performs multiple measurements. Through multiple iterations of numerical analysis methods, a more accurate transformation relationship is obtained, that is, the transformation matrix M is calculated, thereby reducing the measurement error caused by the fluctuation of the corresponding data.

[0062] (5) In actual engineering, the air blowing method is used to measure the liquid level amplitude of the pulse extraction column, and the amplitude measurement results and the corresponding adjustable factor conditions are recorded to form a coordinate point set X1;

[0063] (6) The amplitude of the pulse extraction column in the actual project is calculated by back-calculation based on the transformation matrix M and X1.

[0064] In some embodiments, the method further includes:

[0065] After step (4), the pulse extraction column level amplitude is measured again at the bench test site using the air blowing method. The amplitude measurement results and their corresponding adjustable factors are recorded to form a coordinate point set X2. Alternatively, in step (3), more measurements are performed at once. The amplitude measurement results and their corresponding adjustable factors that are more than those of the ultrasonic method or direct measurement method are used to form a coordinate point set X2. The transformed coordinate point set Y2 is calculated by back-calculating based on X2 and the transformation matrix M. That is, the new measurement data is substituted into the generated calculation matrix M for calculation, thereby verifying the effectiveness and superiority of the algorithm in this method.

[0066] Compare Y2 with the coordinate point set Y obtained by ultrasonic or direct measurement methods, calculate the error between the two, and judge the reliability of the transformation matrix M based on the magnitude of the error.

[0067] Specifically, the error between Y2 and Y is expressed as:

[0068] E=1 / n√(∑n(x1i-x3i)^2+(y1i-y3i)^2+(z1i-z3i)^2)

[0069] Where n is the number of coordinate points, x1i, y1i and z1i are the x-coordinate, y-coordinate and amplitude of the i-th coordinate point in Y2, and x3i, y3i and z3i are the x-coordinate, y-coordinate and amplitude of the i-th coordinate point in Y.

[0070] In this embodiment, if the error between Y2 and Y is less than 0.01, it is considered that the algorithm of this method can effectively optimize the measurement accuracy of the blowing method and improve the accuracy and stability of the pulse extraction column amplitude measurement; otherwise, the experiment is repeated, and the new measurement data is substituted into the generated calculation matrix M for calculation until the algorithm meets the error requirements after verification.

[0071] This embodiment proposes a more comprehensive method for measuring the liquid level amplitude of a pulse extraction column using the air blowing method. This method involves physical modeling, numerical analysis, and bench testing. By utilizing bench testing to measure the liquid level amplitude of a specific pulse extraction column within a range of adjustable conditions, more accurate real-time data is obtained. This data is then compared with data obtained using the currently used air blowing method in the bench test through numerical analysis to establish a fitting and comparison relationship (i.e., transformation matrix M). Furthermore, by using data from actual engineering measurements of the currently used air blowing method and comparing it with the established fitting and comparison relationship, the measurement results of the air blowing method are optimized. This effectively reduces interference from various environmental factors affecting the air blowing method, reduces corresponding hysteresis and amplitude measurement errors, and improves the reliability and consistency of the measurement results.

[0072] Example 2

[0073] like Figure 2 As shown, this embodiment discloses a device for measuring the liquid level amplitude of a pulse extraction column, used in the method described in Embodiment 1. The device includes a test bench, a receiving module, a processing module, and a calculation module, wherein:

[0074] The test bench setup, constructed based on actual engineering information, is used to measure the amplitude of the pulse extraction column using ultrasonic / direct measurement and air blowing methods.

[0075] The receiving module is used to acquire the coordinate point set Y, which consists of the pulse extraction column liquid level amplitude measurement result obtained by the ultrasonic method or direct measurement method at the test bench device and the corresponding adjustable factor conditions; acquire the coordinate point set X, which consists of the pulse extraction column liquid level amplitude measurement result obtained by the air blowing method under the same conditions and the corresponding adjustable factor conditions; and acquire the coordinate point set X1, which consists of the pulse extraction column liquid level amplitude measurement result obtained by the air blowing method in actual engineering and the corresponding adjustable factor conditions. The acquisition method can be any one or more of the existing methods such as manual input.

[0076] The processing module is electrically connected to the receiving module and is used to calculate the relationship between Y and X to obtain the transformation matrix M from X to Y. For the specific calculation method, please refer to step (4) of Example 1, which will not be repeated here.

[0077] The calculation module, which is electrically connected to the receiving module and the processing module respectively, is used to calculate the amplitude of the pulse extraction column in the actual project based on M and X1.

[0078] In some embodiments, the device further includes a verification module.

[0079] The verification module is electrically connected to the receiving module and the processing module respectively. The receiving module is also used to acquire the newly measured amplitude measurement result obtained by measuring the liquid level amplitude of the pulse extraction column again using the air blowing method, and the coordinate point set X2 composed of the corresponding adjustable factor conditions. The verification module is used to calculate the transformed coordinate point set Y2 based on X2 and the transformation matrix M, compare Y2 with Y, calculate the error between the two, and judge the reliability of the transformation matrix M based on the magnitude of the error.

[0080] Specifically, the error between Y2 and Y can be expressed as:

[0081] E=1 / n√(∑n(x1i-x3i)^2+(y1i-y3i)^2+(z1i-z3i)^2)

[0082] Where n is the number of coordinate points, x1i, y1i and z1i are the x-coordinate, y-coordinate and amplitude of the i-th coordinate point in Y2, and x3i, y3i and z3i are the x-coordinate, y-coordinate and amplitude of the i-th coordinate point in Y.

[0083] In this embodiment, if the error between Y2 and Y is less than 0.01, it is considered that the algorithm of this method can effectively optimize the measurement accuracy of the blowing method and improve the accuracy and stability of the pulse extraction column amplitude measurement; otherwise, the experiment is repeated, and the new measurement data is substituted into the generated calculation matrix M for calculation until the algorithm meets the error requirements after verification.

[0084] Example 3

[0085] like Figure 3 As shown, this embodiment discloses an apparatus for measuring the liquid level amplitude of a pulse extraction column, including a memory and a processor. The memory stores a computer program, and the processor is configured to run the computer program to perform steps (4) to (6) of the method for measuring the liquid level amplitude of a pulse extraction column as described in Embodiment 1.

[0086] The apparatus for measuring the liquid level amplitude of the pulse extraction column described in Examples 2 and 3 uses bench tests to perform various measurements on the liquid level amplitude of a specific type of pulse extraction column within a range of adjustable factors. This yields relatively accurate real-time data from the bench tests. The data obtained from the bench tests using the currently used air-blowing method is then compared with the data obtained using numerical analysis to establish a fitting and comparison relationship (i.e., transformation matrix M). Furthermore, the measurement results of the air-blowing method are optimized by comparing the data measured in actual engineering with the established fitting and comparison relationship. This effectively reduces interference from various factors in the measurement environment, reduces corresponding hysteresis and amplitude measurement errors, and improves the reliability and consistency of the measurement results.

[0087] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of the present invention, and the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A method for measuring the liquid level amplitude of a pulse extraction column, characterized in that, include: (1) Determine the type of pulse extraction column, sieve plate, and two-phase fluid used in actual engineering, and determine the adjustable factors of the pulse extraction column used in actual engineering. (2) Build the bench test apparatus according to step (1) and determine the adjustable factors that need to be considered in the bench test; (3) At the bench test site, select the ultrasonic method or directly measure the liquid level amplitude of the pulse extraction column, record the amplitude measurement results and the corresponding adjustable factor conditions, and form a coordinate point set Y; at the bench test site, use the air blowing method to measure the liquid level amplitude of the pulse extraction column under the same conditions, record the amplitude measurement results and the corresponding adjustable factor conditions, and form a coordinate point set X; (4) Calculate the relationship between Y and X to obtain the transformation matrix M from X to Y; The transformation matrix M is calculated and iterated using a nonlinear regression method, and the specific steps include:

101. Based on the coordinate point set Y, define a nonlinear model Y = f(X; β) + ε, where Y is the dependent variable measured by the ultrasonic method or the direct measurement method, X is the independent variable measured by the air blowing method, β is the parameter vector, ε is the nonlinear error term in the conversion between the two methods, and f is a nonlinear function. Calculate the initial value of the iteration.

102. Define a cost function J(β) = (1 / 2m)∑(f(xi;β)-yi)^2, where m is the number of data points, yi is the i-th observation, and f(xi;β) is the predicted value; 103. Choose an initial parameter vector β_0 = (0, 0, ..., 0); 104. Use Newton's method to update the parameter vector to minimize the cost function; 105. Repeat step 104 until the parameter vector converges to a local optimum or reaches the preset number of iterations. Then, determine whether the nonlinear function f has converged. If it has converged, the corresponding function f is the transformation matrix M. (5) In actual engineering, the air blowing method is used to measure the liquid level amplitude of the pulse extraction column, and the amplitude measurement results and the corresponding adjustable factor conditions are recorded to form a coordinate point set X1; (6) The amplitude of the pulse extraction column in the actual project is calculated by back-calculation based on the transformation matrix M and X1.

2. The method for measuring the liquid level amplitude of a pulse extraction column according to claim 1, characterized in that, The adjustable factors in step (2) are one or more of pulse gas pressure and pulse frequency.

3. The method for measuring the liquid level amplitude of a pulse extraction column according to claim 1, characterized in that, The method further includes: After step (4), the pulse extraction column level amplitude is measured again at the bench test site using the blowing method. The newly measured amplitude measurement results and their corresponding adjustable factor conditions are recorded to form a coordinate point set X2. The transformed coordinate point set Y2 is calculated by back-calculation based on X2 and the transformation matrix M. Compare Y2 with Y, calculate the error between them, and determine the reliability of the transformation matrix M based on the magnitude of the error.

4. An apparatus for measuring the liquid level amplitude of a pulse extraction column as described in any one of claims 1-3, characterized in that, It includes a test bench device (11), a receiving module (12), a processing module (13) and a calculation module (14). The test bench device (11) is built according to actual engineering information and is used to measure the amplitude of the pulse extraction column by ultrasonic method, direct measurement method and air blowing method. The receiving module (12) is used to acquire the set of coordinate points Y consisting of the pulse extraction column liquid level amplitude measurement result obtained by the ultrasonic method or direct measurement method at the test bench device and the corresponding adjustable factor conditions; acquire the set of coordinate points X consisting of the pulse extraction column liquid level amplitude measurement result obtained by the air blowing method under the same conditions and the corresponding adjustable factor conditions; and acquire the set of coordinate points X1 consisting of the pulse extraction column liquid level amplitude measurement result obtained by the air blowing method in actual engineering and the corresponding adjustable factor conditions. The processing module (13) is electrically connected to the receiving module and is used to calculate the relationship between Y and X to obtain the transformation matrix M from X to Y; The calculation module (14) is electrically connected to the receiving module and the processing module respectively, and is used to calculate the amplitude of the pulse extraction column in the actual project based on M and X1.

5. The apparatus for measuring the liquid level amplitude of a pulse extraction column according to claim 4, characterized in that, It also includes a verification module (15). The verification module is electrically connected to the receiving module and the processing module, respectively. The receiving module is also used to acquire the newly measured amplitude measurement result obtained by measuring the liquid level amplitude of the pulse extraction column again using the air blowing method, and the coordinate point set X2 consisting of the corresponding adjustable factor conditions. The verification module is used to calculate the transformed coordinate point set Y2 based on X2 and the transformation matrix M, compare Y2 with Y, calculate the error between the two, and judge the reliability of the transformation matrix M based on the magnitude of the error.

6. A device for measuring the level amplitude of a pulse extraction column, characterized in that, It includes a memory (21) and a processor (22), the memory storing a computer program and the processor being configured to run the computer program to perform a method for measuring the level amplitude of a pulse extraction column as described in any one of claims 1-3.

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