Method and system for testing response time and signal-to-noise ratio of flowmeter coil

Abstract

The invention provides a method and system for testing response time and signal-to-noise ratio of a flowmeter coil, and the method comprises the steps: clamping a to-be-tested coil below a support through a first iron clamp, and clamping a tracing magnetic block above the support through a second iron clamp, the circular surface of the tracing magnetic block is kept horizontal, and the height from the tracing magnetic block to the table top is consistent with the second height; opening the oscillographic device; loosening the second iron clamp, enabling the tracing magnetic block to fall down and pass through the center of the coil to be tested, and obtaining a test signal through the oscillographic device; acquiring a signal-to-noise ratio and response time of the coil to be tested according to the test signal; judging whether the signal-to-noise ratio of the to-be-detected coil meets the corresponding signal-to-noise ratio index requirement or not, and judging that the response time of the to-be-detected coil meets the response time index requirement; whether the to-be-tested coil and the filter circuit are allowed to be used for producing the flowmeter or not is determined according to the judgment result, and index testing of the signal-to-noise ratio and the response time of the induction coil is achieved.

Description

Technical Field

[0001] This application relates to the field of design, manufacturing and testing technology of high viscosity solid-liquid two-phase flow meters, and in particular to a test method for the response time and signal-to-noise ratio of the coil of a high viscosity solid-liquid two-phase flow meter. Background Technology

[0002] In related technologies, each step in the production process of high-viscosity solid-liquid two-phase flow metering requires inspection, and each component also needs to be tested for certain indicators after manufacturing to determine whether it meets the overall manufacturing requirements and can be used in the next process. Analysis revealed that the main indicators affecting the final flow meter measurement accuracy include the signal-to-noise ratio (SNR) and response time of the induction coil; however, there are currently no testing methods for the SNR and response time of the induction coil. Therefore, it is necessary to design a testing method for the SNR and response time of the induction coil. Summary of the Invention

[0003] This application provides a method for testing the response time and signal-to-noise ratio of a high-viscosity solid-liquid two-phase flow meter coil, so as to achieve the testing of the signal-to-noise ratio and response time of the induction coil. The technical solution of this disclosure is as follows: In a first aspect, embodiments of this application propose a method for testing the response time and signal-to-noise ratio of a high-viscosity solid-liquid two-phase flow meter coil, comprising: The vertical bracket is fixed on the workbench, and the coil to be tested is held under the bracket by the first iron clamp. The coil to be tested is connected to the oscilloscope device through the filter circuit. Measure the first height of the coil under test from the stage, and determine the second height of the tracer magnetic block from the stage based on the first height and the preset speed of the tracer magnetic block; The tracer magnetic block is held above the support by a second iron clamp, and the circular surface of the tracer magnetic block is kept horizontal and the height of the tracer magnetic block from the table surface is consistent with the second height. Turn on the oscilloscope and adjust it to the automatic vertical axis function, data logging function, and automatic screen capture function; Release the second iron clamp to allow the tracer magnetic block to fall and pass through the center of the coil under test, and obtain the test signal through the oscilloscope; Based on the test signal, obtain the signal-to-noise ratio and response time of the coil under test; Determine whether the signal-to-noise ratio of the coil under test meets the corresponding signal-to-noise ratio requirements, and determine whether the response time of the coil under test meets the response time requirements; If the signal-to-noise ratio of the coil under test meets the corresponding signal-to-noise ratio requirements and the response time of the coil under test meets the response time requirements, the production of flow meters using the coil under test and the filter circuit is permitted.

[0004] Secondly, embodiments of this application propose a testing system for the signal-to-noise ratio and response time of a high-viscosity solid-liquid two-phase flow meter coil. This system is used to implement the testing method for the response time and signal-to-noise ratio of the high-viscosity solid-liquid two-phase flow meter coil as described in the first aspect. The system includes: The components include a workbench, a vertical support, a first iron clamp, and a second iron clamp. The vertical support is fixed to the workbench surface. The first and second iron clamps are detachably connected to the vertical support. The first iron clamp is used to hold the coil to be tested, and the second iron clamp is used to hold the tracer magnetic block. The electronic device is equipped with oscilloscope software, a data acquisition card, a memory, and a data processing module; the data acquisition card is used to connect to the filtering circuit, and the oscilloscope software is used to acquire test signals and display signal waveforms. A data processing module is used to determine a second height of the tracer magnetic block from the platform based on a first height and a preset speed of the tracer magnetic block; to acquire the signal-to-noise ratio and response time of the coil under test based on the test signal; to determine whether the signal-to-noise ratio of the coil under test meets the corresponding signal-to-noise ratio index requirement; to determine whether the response time of the coil under test meets the response time index requirement; and to visualize the calculation results. A test system for the signal-to-noise ratio and response time of a high-viscosity solid-liquid two-phase flow meter coil is characterized in that the system is used to implement the test method for the response time and signal-to-noise ratio of a high-viscosity solid-liquid two-phase flow meter coil as described in any one of claims 1 to 9; the system includes: The components include a workbench, a vertical support, a first iron clamp, and a second iron clamp. The vertical support is fixed to the workbench surface. The first and second iron clamps are detachably connected to the vertical support. The first iron clamp is used to hold the coil to be tested, and the second iron clamp is used to hold the tracer magnetic block. The electronic device is equipped with oscilloscope software, a data acquisition card, a memory, and a data processing module; the data acquisition card is used to connect to the filtering circuit, and the oscilloscope software is used to acquire test signals and display signal waveforms. The data processing module is used to determine the second height of the tracer magnetic block from the platform based on the first height and the preset speed of the tracer magnetic block. It is also used to obtain the signal-to-noise ratio and response time of the coil under test based on the test signal, determine whether the signal-to-noise ratio of the coil under test meets the corresponding signal-to-noise ratio index requirements, determine whether the response time of the coil under test meets the response time index requirements, and visualize the calculation results.

[0005] The test method for the response time and signal-to-noise ratio of the coil of the high-viscosity solid-liquid two-phase flow meter provided in this application innovatively proposes to use the signal-to-noise ratio and response time of the coil of the high-viscosity solid-liquid two-phase flow meter as product quality control indicators, and proposes a test method for the signal-to-noise ratio and response time indicators of the coil of the high-viscosity solid-liquid two-phase flow meter, so as to improve the measurement accuracy of the high-viscosity solid-liquid two-phase flow meter from the perspective of the signal-to-noise ratio and response time of the coil of the high-viscosity solid-liquid two-phase flow meter.

[0006] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0007] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein: Figure 1 A schematic flowchart illustrating a method for testing the response time and signal-to-noise ratio of a high-viscosity solid-liquid two-phase flow meter coil, as provided in an embodiment of this application. Figure 2 A schematic diagram of a test device for the signal-to-noise ratio and response time of a flow meter coil provided in an embodiment of this application; Figure 3 This is a flowchart of a test system for the signal-to-noise ratio and response time of a flowmeter coil, provided as an embodiment of this application. Detailed Implementation

[0008] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0009] Analysis revealed that the main indicators affecting the final flow meter measurement accuracy include the signal-to-noise ratio and response time of the induction coil, but there are currently no testing methods for the signal-to-noise ratio and response time of the induction coil.

[0010] To address this issue, embodiments of this application provide a method for testing the response time and signal-to-noise ratio of a high-viscosity solid-liquid two-phase flow meter coil.

[0011] The following describes, with reference to the accompanying drawings, a method, apparatus, and device for testing the response time and signal-to-noise ratio of a high-viscosity solid-liquid two-phase flow meter coil according to embodiments of this application.

[0012] Figure 1 This is a schematic flowchart illustrating a method for testing the response time and signal-to-noise ratio of a high-viscosity solid-liquid two-phase flow meter coil, as provided in an embodiment of this application.

[0013] It should be noted that the execution subject of the test method for the response time and signal-to-noise ratio of the high viscosity solid-liquid two-phase flow meter coil in this application embodiment is the test device for the signal-to-noise ratio and response time of the flow meter coil in this application embodiment. The test device for the signal-to-noise ratio and response time of the flow meter coil can be configured in an electronic device so that the electronic device can perform the test function for the signal-to-noise ratio and response time of the flow meter coil.

[0014] like Figure 1 As shown, the test method for the response time and signal-to-noise ratio of the high-viscosity solid-liquid two-phase flow meter coil includes the following steps: Step S101: Fix the vertical bracket on the workbench surface, and clamp the coil to be tested under the bracket with the first iron clamp. The coil to be tested is connected to the oscilloscope device through the filter circuit.

[0015] The response time and signal-to-noise ratio of the high-viscosity solid-liquid two-phase flow meter coil in this embodiment are tested using a coil testing device, such as... Figure 2 As shown, the coil testing device includes a workbench 1 and a vertical support 2. The vertical support 2 is fixed to the upper surface of the workbench 1. A second iron clamp 3 and a first iron clamp 4 are detachably connected to the vertical support 2. The second iron clamp 3 is used to clamp the tracer magnetic block 5, and the first iron clamp 4 is used to clamp the coil 6 to be tested.

[0016] For example, the workbench 1 can be a workbench made of any possible material that does not affect the operation of the tracer magnet, such as an iron frame or a stainless steel workbench.

[0017] In some embodiments, the vertical support 2 is provided with a scale indicating the height relative to the table surface, for initial adjustment of the height of the second iron clamp 3 and the first iron clamp 4 relative to the table surface.

[0018] In some embodiments, after the coil to be tested is fixed by the first iron clamp, the first height of the coil to be tested is measured and the data is recorded.

[0019] In some embodiments, before clamping the coil under test with a first iron clamp below the support, the process includes: measuring and recording the outer diameter and thickness of the tracer magnetic block using calipers; measuring and recording the first magnetic field strength on the surface of the tracer magnetic block; measuring and recording the second magnetic field strength on the surface of the stainless steel tube when the tracer magnetic block is at the center of the stainless steel tube; measuring and recording the outer diameter of the stainless steel tube; measuring and recording the resistance of the coil under test; and standardizing the specifications and parameters of the tracer magnetic block during the testing process based on the recorded data.

[0020] For example, before testing, it is necessary to check whether the coil testing equipment is in good working order: workbench, vertical support, tracer magnetic block, filter circuit, oscilloscope, calipers or ruler, insulating tape, etc.; use calipers to measure and record the outer diameter and thickness of the tracer magnetic block; measure and record the magnetic field strength on the surface of the tracer magnetic block; measure and record the magnetic field strength (mT) on the surface of a stainless steel tube when the tracer magnetic block is at the center of a stainless steel tube of a certain diameter; measure and record the outer diameter of the stainless steel tube; measure and record the resistance of the coil under test in the high-viscosity solid-liquid two-phase flow electromagnetic flowmeter; verify whether the tracer magnetic block and the coil under test meet the testing requirements based on the above data. After meeting the requirements, proceed according to... Figure 2 As shown, the tracer magnetic block and the coil under test are fixed by the second iron clamp and the first iron clamp respectively, so that the circular surface of the tracer magnetic block is kept horizontal, and the height H2' of the lower surface of the tracer magnetic block is measured with calipers or ruler.

[0021] In some embodiments, the fabrication process of the coil under test (i.e., the induction coil) includes: using a ring-shaped polymer material as the frame, the cross-section of the ring being an inverted П-shape, winding enameled copper wire in the inner ring, and filling the frame with epoxy resin. After the epoxy resin cures, the induction coil is fabricated. The two ends of the copper wire of the induction coil are soldered to quick-connect components for easy connection to the filter circuit.

[0022] In some embodiments, the filter circuit includes a circuit board with a two-wire connector that connects to a quick-connect element on the coil under test. In other words, the filter circuit is fabricated as an integrated circuit board, with the two-wire connector mounted on the board for easy output of the loop signal. The filter circuit utilizes integrated circuit board technology to minimize its area; if the length of a single side does not exceed the coil height or thickness, it can be installed together with the coil via a plug-in connection, or, after testing and passing inspection, directly encapsulated within the coil cross-section.

[0023] In some embodiments, the oscilloscope device is an oscilloscope or a computer configured with oscilloscope software.

[0024] Step S102: Measure the first height of the coil under test from the platform, and determine the second height of the tracer magnetic block from the platform based on the first height and the preset speed of the tracer magnetic block.

[0025] In some embodiments, the method for determining the second height of the tracer magnetic block from the platform based on the first height and the preset speed of the tracer magnetic block includes: The second height of the tracer magnet above the platform is determined using the following formula, based on the preset speed of the tracer magnet:

[0026] in, The first height of the coil under test from the platform. The second highest altitude, The preset speed of the tracer magnet, It is gravitational acceleration.

[0027] In some embodiments, the preset speed of the tracer magnetic block is obtained based on actual operating conditions, that is, the speed at which the tracer magnetic block passes through the coil is summarized based on actual operating conditions and specified in the testing phase.

[0028] Step S103: The tracer magnetic block is clamped above the support by the second iron clamp, and the circular surface of the tracer magnetic block is kept horizontal and the height of the tracer magnetic block from the table surface is consistent with the second height.

[0029] In some embodiments, the height of the second clamp is adjusted so that the second height of the tracer magnetic block from the platform is consistent with H2.

[0030] In some embodiments, the tracer magnet is a strong magnet, such as a neodymium iron boron magnet.

[0031] Step S104: Turn on the oscilloscope and adjust it to the automatic vertical coordinate function, data recording function, and automatic screen capture function.

[0032] Before testing, you need to turn on the oscilloscope and activate its automatic vertical coordinate function, data recording function, and automatic screen capture function.

[0033] Step S105: Release the second iron clamp, allowing the tracer magnetic block to fall and pass through the center of the coil under test, and acquire the test signal through the oscilloscope.

[0034] In this step, the tracer magnetic block held by the second iron clamp is manually released. At this time, the tracer magnetic block passes through the coil under test at a preset speed. During this process, the signal is captured by an oscilloscope.

[0035] Step S106: Obtain the signal-to-noise ratio and response time of the coil under test based on the test signal.

[0036] In some embodiments, the test signal is a voltage signal, and the test signal includes the first rising zero-point occurrence time of the voltage signal. Peak occurrence time of voltage signal The falling zero point of the voltage signal and the trough time of the voltage signal Based on the test signal, obtain the response time of the coil under test. ,include: The response time of the coil under test can be obtained from the test signal using the following formula: If the peak appears first...

[0037] If the trough appears first .

[0038] In some embodiments, the test signal includes peak voltage values. Valley voltage value and the absolute value of the maximum voltage of noise Based on the test signal, the signal-to-noise ratio of the coil under test is obtained, including: The signal-to-noise ratio of the coil under test is obtained from the test signal using the following formula. : min{ , } The signal-to-noise ratio (SNR) can be understood as the ratio of signal power to noise power. Since power is proportional to the square of voltage, the SNR can also be directly expressed as voltage when the load resistance is the same, which is convenient for measurement by oscilloscopes.

[0039] Step S107: Determine whether the signal-to-noise ratio of the coil under test meets the corresponding signal-to-noise ratio index requirements, and determine whether the response time of the coil under test meets the response time index requirements.

[0040] In some embodiments, a method for determining whether the response time of the coil under test meets the response time specification requirements includes: determining whether the response time is less than or equal to an upper limit value for the response time. If the response time is less than or equal to the upper limit of the response time, the response time of the coil under test is determined to meet the response time index requirement, i.e., if If the response time is within the acceptable range, the response time index of the coil under test meets the product requirements; if the response time is greater than the upper limit of the response time, replace the filter circuit connected to the coil under test and re-execute the test steps; if the response time after re-executing the test steps is greater than the upper limit of the response time, send the coil under test to the non-conforming product handling procedure.

[0041] In some embodiments, after obtaining the signal-to-noise ratio (SNR) of the coil under test, the method includes: determining whether the SNR is greater than or equal to the lower limit of the SNR, X min; if the SNR is greater than or equal to the lower limit of the SNR, determining that the SNR of the coil under test meets the corresponding SNR specification requirement; that is, if... If X min, the signal-to-noise ratio (SNR) of the coil under test meets the product requirements; if the SNR is less than the lower limit, replace the filter circuit connected to the coil under test and re-execute the test steps; if the SNR is less than the lower limit after re-executing the test steps, send the coil under test to the non-conforming product handling procedure.

[0042] Step S108: If it is determined that the signal-to-noise ratio of the coil under test meets the corresponding signal-to-noise ratio index requirement and the response time of the coil under test meets the response time index requirement, it is permissible to use the coil under test and the filter circuit to produce a flow meter.

[0043] If both the test coil and the filter circuit meet the above two criteria, the test coil and filter circuit are approved to proceed to the next step in the production of high-viscosity solid-liquid two-phase flow meters; otherwise, the non-conforming product handling procedure is initiated.

[0044] It should be noted that the test method for the response time and signal-to-noise ratio of the flow meter coil in this solution is an inspection step in the flow meter production process. Based on the verification of whether the signal-to-noise ratio and response time are qualified, it is determined that the coil under test and the filter circuit can be used to produce the flow meter, which can ensure the measurement accuracy of the flow meter.

[0045] This embodiment of the test method for the response time and signal-to-noise ratio of the high-viscosity solid-liquid two-phase flow meter coil innovatively proposes to use the signal-to-noise ratio and response time of the high-viscosity solid-liquid two-phase flow meter coil as product quality control indicators, and proposes a test method for the signal-to-noise ratio and response time indicators of the high-viscosity solid-liquid two-phase flow meter coil, so as to improve the measurement accuracy of the high-viscosity solid-liquid two-phase flow meter from the perspective of the signal-to-noise ratio and response time of the high-viscosity solid-liquid two-phase flow meter coil.

[0046] To clearly illustrate the above embodiments, specific examples will now be used for explanation. Figure 3 This is a flowchart illustrating a testing system for the signal-to-noise ratio and response time of a high-viscosity solid-liquid two-phase flow meter coil, as provided in an embodiment of this application. Figure 3 As shown, the test method for the response time and signal-to-noise ratio of a high-viscosity solid-liquid two-phase flow meter coil of this application is applied to a test system for the signal-to-noise ratio and response time of a high-viscosity solid-liquid two-phase flow meter coil. This test system includes: a worktable, a vertical support, a first iron clamp, and a second iron clamp. The vertical support is fixed to the worktable surface. The first and second iron clamps are detachably connected to the vertical support. The first iron clamp is used to hold the coil under test, and the second iron clamp is used to hold the tracer magnetic block. Electronic equipment is also included. The system includes oscilloscope software, a data acquisition card, a memory, and a data processing module. The data acquisition card connects to the filtering circuit, and the oscilloscope software acquires test signals and displays their waveforms. The data processing module determines the second height of the tracer magnet from the platform based on the first height and the preset speed of the tracer magnet. It also acquires the signal-to-noise ratio (SNR) and response time of the coil under test based on the test signal, determines whether the SNR meets the corresponding SNR specification, determines whether the response time meets the response time specification, and visualizes the calculation results. Specifically, for example... Figure 3 As shown, the testing process for applying this system includes the following steps: (1) Check whether the experimental equipment is in good working order: workbench, iron clamp, tracer magnetic block, stainless steel tube with coil installed, filter circuit, oscilloscope, caliper or ruler, insulating tape, etc. (2) Use calipers to measure the outer diameter and thickness of the tracer magnetic block and record the data; measure the magnetic field strength (mT) on the surface of the tracer magnetic block and record the data; measure the magnetic field strength (mT) on the surface of the stainless steel when the tracer magnetic block is at the center of a stainless steel tube of a certain diameter and record the data. (3) Measure the outer diameter of the stainless steel pipe and record the data; (4) Measure the resistance of the coil under test and record the data; (5) According to Figure 2 Sequential connection system; (6) Measure the first height H1 of the coil under test and record the data; (7) Calculate the second height H2 of the tracer magnet according to the following formula, and adjust the iron clamp along the vertical support to this height; Formula 1:

[0047] Where v is the speed at which the tracer magnetic block passes through the coil, as summarized based on actual working conditions and specified in the testing phase, and g is the acceleration due to gravity.

[0048] (8) Clamp the tracer magnetic block on the iron clamp, keep the circular surface horizontal, and measure the height H2' of the lower surface with calipers or ruler.

[0049] (9) Fine-tune the height of the clamp so that H2' is consistent with H2; (10) Turn on the oscilloscope and adjust it to the automatic vertical axis function, data recording function, and automatic screen capture function; (11) Manually release the tracer magnetic block held by the iron clamp. At this time, the tracer magnetic block passes through the coil at a calculated speed. (12) Based on the signal captured by the oscilloscope, record the time of the first voltage rise zero T00, the time of the voltage peak T1, the time of the voltage fall zero T10, the time of the voltage trough T2, and the time of the second voltage rise (fall) zero T20; calculate the response time according to Formula 2. ; Formula 2: If the peak appears first

[0050] If the trough appears first

[0051] (13) Determine whether the response time meets the upper limit requirement based on Formula 3. ; Formula 3:

[0052] (14) Based on the signal captured by the oscilloscope, record the peak voltage value U1, the trough voltage value U2, and the absolute value of the maximum noise voltage U3; calculate the signal-to-noise ratio X according to formula 4; Formula 4 min{ , } (15) Determine whether the signal-to-noise ratio meets the lower limit value X min according to Formula 5; Formula 5 X min (16) When the coil and the filter circuit meet the above two indicators at the same time, the use of the coil and the filter circuit is approved to enter the next process of producing high viscosity solid-liquid two-phase flow meter; otherwise, the filter circuit connected to the coil under test is replaced and the test steps are repeated. If the above two indicators are still not met after the test steps are repeated, the non-conforming product handling procedure is entered.

[0053] In the foregoing descriptions of the embodiments, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0054] Furthermore, 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0055] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A method for testing the response time and signal-to-noise ratio of a flowmeter coil, characterized in that, include: A vertical bracket is fixed on the workbench surface, and the coil to be tested is held under the bracket by a first iron clamp. The coil to be tested is connected to an oscilloscope device through a filter circuit. The first height of the coil under test from the platform is measured, and the second height of the tracer magnetic block from the platform is determined based on the first height and the preset speed of the tracer magnetic block. The tracer magnetic block is held above the bracket by a second iron clamp, and the circular surface of the tracer magnetic block is kept horizontal and the height of the tracer magnetic block from the table surface is consistent with the second height. Turn on the oscilloscope and adjust it to the automatic vertical coordinate function, data recording function, and automatic screen capture function; Release the second iron clamp to allow the tracer magnetic block to fall and pass through the center of the coil under test, and acquire the test signal through the oscilloscope device; Based on the test signal, obtain the signal-to-noise ratio and response time of the coil under test; Determine whether the signal-to-noise ratio of the coil under test meets the corresponding signal-to-noise ratio index requirements, and determine whether the response time of the coil under test meets the response time index requirements; If the signal-to-noise ratio of the coil under test meets the corresponding signal-to-noise ratio requirement and the response time of the coil under test meets the response time requirement, the production of a flow meter using the coil under test and the filter circuit is permitted.

2. The method according to claim 1, characterized in that, The test signal includes the first rising zero point occurrence time of the voltage signal. Peak occurrence time of voltage signal The falling zero point of the voltage signal and the trough time of the voltage signal The step is to obtain the response time of the coil under test based on the test signal. ,include: The response time of the coil under test is obtained based on the test signal using the second formula, which is expressed as follows: If the peak appears first... If the trough appears first .

3. The method according to claim 1 or 2, characterized in that, The test signal includes peak voltage value. Valley voltage value and the absolute value of the maximum voltage of noise The step of obtaining the signal-to-noise ratio of the coil under test based on the test signal includes: The signal-to-noise ratio of the coil under test is obtained using the third formula based on the test signal. The third formula is expressed as follows: min{ , }。 4. The method according to claim 3, characterized in that, The step of determining whether the response time of the coil under test meets the response time index requirement includes: Determine whether the response time is less than or equal to the upper limit of the response time; If the response time is less than or equal to the upper limit of the response time, it is determined that the response time of the coil under test meets the response time index requirement. If the response time is greater than the upper limit of the response time, replace the filter circuit connected to the coil under test and repeat the test steps. If the response time after re-executing the test steps exceeds the upper limit of the response time, the coil under test will be sent to the non-conforming product handling procedure.

5. The method according to claim 4, characterized in that, The step of determining whether the signal-to-noise ratio of the coil under test meets the corresponding signal-to-noise ratio specification requirements includes: Determine whether the signal-to-noise ratio is greater than or equal to the lower limit of the signal-to-noise ratio; If the signal-to-noise ratio is greater than or equal to the lower limit of the signal-to-noise ratio, it is determined that the signal-to-noise ratio of the coil under test meets the corresponding signal-to-noise ratio index requirement; If the signal-to-noise ratio is less than the lower limit of the signal-to-noise ratio, replace the filter circuit connected to the coil under test and repeat the test steps. If the signal-to-noise ratio is less than the lower limit after re-performing the test steps, the coil under test will be sent to the non-conforming product handling procedure.

6. The method according to claim 1, characterized in that, Before the coil to be tested is clamped by the first iron clamp below the bracket, the process includes: The outer diameter and thickness of the tracer magnetic block were measured using calipers and the data were recorded. Measure the strength of the first magnetic field on the surface of the tracer magnetic block and record the data; The strength of the second magnetic field on the surface of the stainless steel tube was measured and recorded when the tracer magnetic block was at the center of the stainless steel tube. The outer diameter of the stainless steel tube was also measured and recorded. Measure the resistance of the coil under test and record the data; Based on the recorded data, the specifications and parameters of the tracer magnetic blocks are standardized during the testing process.

7. The method according to claim 1, characterized in that, Determining the second height of the tracer magnetic block from the platform based on the first height and the preset speed of the tracer magnetic block includes: Using a first formula, based on the first height and the preset speed of the tracer magnetic block, a second height of the tracer magnetic block from the platform is determined. The first formula is expressed as follows: in, As the highest point, The second highest altitude, The preset speed of the tracer magnet, It is gravitational acceleration.

8. The method according to claim 1, characterized in that, The tracer magnet is a neodymium iron boron magnet, the filter circuit includes a circuit board, the circuit board is equipped with a two-wire plug, the two-wire plug is connected to a quick-connect element connected to the coil under test, and the vertical bracket is provided with a scale marked with the height.

9. The method according to claim 1, characterized in that, The preset speed of the tracer magnetic block is obtained based on the actual working conditions.

10. A test system for the response time and signal-to-noise ratio of a flowmeter coil, characterized in that, The system is used to implement the test method for the response time and signal-to-noise ratio of the flowmeter coil as described in any one of claims 1 to 9, and the system comprises: The system includes a workbench, a vertical support, a first iron clamp, and a second iron clamp. The vertical support is fixed to the surface of the workbench. The first iron clamp and the second iron clamp are detachably connected to the vertical support. The first iron clamp is used to hold the coil to be tested, and the second iron clamp is used to hold the tracer magnetic block. An electronic device is provided, which is equipped with oscilloscope software, a data acquisition card, a memory, and a data processing module; wherein, the data acquisition card is used to connect to the filtering circuit, and the oscilloscope software is used to acquire test signals and display signal waveforms; The data processing module is used to determine a second height of the tracer magnetic block from the platform based on the first height and the preset speed of the tracer magnetic block, and to obtain the signal-to-noise ratio and response time of the coil under test based on the test signal, determine whether the signal-to-noise ratio of the coil under test meets the corresponding signal-to-noise ratio index requirement, determine whether the response time of the coil under test meets the response time index requirement, and visualize the calculation results.

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