Ultrasonic measurement head wave detection level online correction method, equipment, medium and product

Abstract

The invention relates to the technical field of ultrasonic measurement, and discloses an ultrasonic measurement head wave detection level online correction method and device, a medium and a product, in the correction method, by detecting level values AM1-AMn corresponding to wave crest amplitude values of a head wave and a plurality of receiving waves in a subsequent receiving sequence, delta AMm with the maximum absolute value in a quantity difference value delta AMn is obtained, and the maximum absolute value of delta AMm is obtained; and further, comparing the flight time difference delta Tn of two adjacent received waves with a first threshold value, and when the data exception proportion exceeds a second threshold value, further correcting to obtain a corrected head wave detection level FHLC. The design is reasonable, the metering precision can be improved, and the use cost of a user can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of ultrasonic metering, and specifically to an online calibration method, device, medium and product for the first wave detection level of ultrasonic metering. Background Art

[0002] In ultrasonic metering, factors such as temperature change, large flow rate of water, bubbles, and aging of the device during long-term operation will all cause the peak amplitude of the wave received by the receiving end of the transducer to change. Generally speaking, it will cause the peak amplitude of the received wave to become smaller.

[0003] In the existing ultrasonic metering meters, the received wave is detected and identified through the FHL level. Among them, FHL is the abbreviation of "First Hit Level" (first hit level), which refers to the threshold of the intensity of the first effective signal (i.e., the first wave) received at the receiving end of the transducer, as Figure 1 shown. This parameter is crucial for ensuring the accurate identification of the arrival time of ultrasonic signals, thus affecting the final flow measurement accuracy.

[0004] The FHL level built into the ultrasonic metering meter for detecting the peak amplitude of the received wave uses a fixed level value to determine the position of the received wave, as Figure 1 shown; when the ultrasonic metering meter ages and the peak amplitude of the received wave becomes smaller, the position of the received wave detected by the same FHL level will be different from before. For example, the originally detected first wave is the second received wave in the received signal sequence, and now it may move forward to become the third wave, or move backward to become the fourth wave (here, the case of moving backward to the fourth wave is used as an example to illustrate the change, and in fact, when moving backward, it may still be the third wave but is reflected as "moving backward" in the overall sequence due to the change of the previous wave).

[0005] In this way, the position of the zero-crossing detection will change, and it may be delayed (wherein, the position of the zero-crossing detection is based on the position of the first wave detected by the FHL level as a reference benchmark). And the measurement of the flight time is determined based on the position of the zero-crossing detection. Therefore, when the zero-crossing detection position changes, the measured flight time will also be delayed by the corresponding waveform period. This phenomenon is usually called "wave jumping", as Figure 2 shown.

[0006] In ultrasonic metering, the flow rate is calculated by comparing the time difference of flight of signals in the upstream and downstream directions. If there is a "wave jump" in one direction or the "wave jumps" in both directions are asynchronous, the calculated time difference of flight will deviate from the actual value, which will lead to an incorrect flow rate obtained finally, seriously affecting the flow rate metering accuracy and even resulting in metering failure. In production practice, even if the same number of "wave jumps" occur in both directions, since the shapes, amplitudes and other characteristics of each wave are not exactly the same, the time difference will still fluctuate, and it is very difficult to correct the metering error caused by the aforementioned wave jumps. Finally, it will cause an error in the metering result and affect the accuracy of water meter metering. In production practice, the above problems are often solved by replacing the ultrasonic metering table. Summary of the Invention

[0007] The present invention discloses an online correction method, device, medium and product for the first wave detection level of ultrasonic metering, which solves the technical problem in the prior art that the metering accuracy is reduced or even fails due to the "wave jump" phenomenon caused by equipment aging, and has the technical effects of reasonable design, being conducive to improving metering accuracy and being conducive to reducing the user's usage cost. The adopted technical solution is as follows: An online correction method for the first wave detection level of ultrasonic metering, which is applied to an ultrasonic metering table, such as an ultrasonic water meter or an ultrasonic gas meter. The correction method includes the steps: S1. Call the first wave detection level FHL built in the ultrasonic metering table AM , the first wave detection level FHL AM is used to detect the peak amplitude of the received wave, and the first wave detection level FHL AM is designed such that the measured first wave is the Nth received wave in the corresponding transducer reception sequence, and N is not greater than 6; S2. The first wave detection level FHL AM detects the level values AM1~AMn corresponding to the peak amplitudes of the first wave and several subsequent received waves in the reception sequence, and obtains the incremental difference ΔAMn = AMn - AMn-1 of the level values corresponding to the peak amplitudes of two adjacent received waves, where n≥2; S3. Obtain the ΔAMm with the largest absolute value in the incremental differences ΔAMn, where 2≤m≤n; S4. Obtain the first wave detection level FHL after the first correction C : FHL C = AMm-1 + F1*ΔAMm F1 is a proportionality coefficient, and 0<F1<1.

[0008] On the basis of the above technical solution, the first wave detection level FHL AMIt is designed such that the measured first wave is the Nth received wave in the received transducer sequence under a static water environment and when the ultrasonic meter is in an unaged state, and N is not greater than 6.

[0009] Based on the above technical solution, N is not greater than 3.

[0010] Based on the above technical solution, 0.3 ≤ F1 ≤ 0.6.

[0011] Based on the above technical solution, it further includes the steps: S5. Call the corrected first wave detection level FHL C After that, record the time of flight TOF1~TOFb of the received waves received by the corresponding transducer, and obtain the time of flight difference ΔTn = Tn - Tn-1 between two adjacent received waves; preferably, TOF1 corresponds to the corrected first wave detection level FHL C The time of flight of the measured first wave.

[0012] S6. Compare the time of flight difference ΔTn between two adjacent received waves with a set first threshold, and the first threshold is positively correlated with the waveform period of the received wave; S7. When the time of flight difference ΔTn between two adjacent received waves is not greater than the first threshold, it is determined that the data is normal; when the time of flight difference ΔTn between two adjacent received waves is greater than the first threshold, it is determined that the data is abnormal.

[0013] Based on the above technical solution, the time of flight TOF1~TOFb of the received waves are all upward time of flight or all downward time of flight.

[0014] Based on the above technical solution, compare the time of flight differences ΔTn of several consecutive adjacent received waves with a set first threshold, and determine whether the proportion of the abnormal data exceeds a set second threshold.

[0015] Based on the above technical solution, the second threshold is 30% - 60%.

[0016] Based on the above technical solution, when the ratio of the abnormal data exceeds the set second threshold, it further includes the following steps: S8. Call the first wave detection level FHL built in the ultrasonic meter AM , call the one built in the ultrasonic meter; S9. Repeat steps S2 and S3; S10. When ΔAMm is not greater than 20 mV, or not greater than half of ΔAMm in the first calibration step, an alarm signal is issued; When the ΔAMm is greater than 20 mV, or greater than half of the ΔAMm in the first calibration step, the first wave detection level FHLm after further calibration is obtained: FHLm=AMm-1+F*ΔAMm F is a proportionality coefficient, and 0<F<1.

[0017] An electronic device comprises a memory, a processor and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the online correction method for the first wave detection level of ultrasonic measurement as described above can be implemented.

[0018] A storage medium stores a computer program, which, when executed by a processor, can implement the above-mentioned online correction method for ultrasonic measurement first wave detection level.

[0019] A computer program product. When instructions in the computer program product are executed by a processor of an electronic device, the electronic device executes the above-mentioned online correction method for first wave detection level of ultrasonic measurement.

[0020] Beneficial Effects The invention is reasonably designed and proposes the first wave detection level FHL AM Perform an online correction method. When a wave jump occurs, the first wave detection level FHL is corrected by identifying the change in the peak amplitude of the received wave. AM , ensure the position accuracy of the zero point, realize the accurate measurement of ultrasonic water meters, effectively reduce the measurement error caused by the change of the peak amplitude of the received wave, significantly improve the stability and reliability of ultrasonic measurement, and reduce the impact of environmental factors or equipment aging on the performance of ultrasonic meters.

[0021] The present invention is cleverly designed, and the correction method is simple and reliable. By identifying the change in the peak amplitude of the first few receiving waves at the receiving end of the transducer in a single meter, and taking the maximum value of the absolute value of the incremental difference of the level values corresponding to the peak amplitudes of two adjacent receiving waves, the first wave detection level is corrected. Not only is the correction process simple and reliable, which is beneficial to reducing the power consumption of the metering module of the ultrasonic meter, but it also does not increase the additional hardware cost, which is beneficial to reducing the user's use cost. Furthermore, the service life of the ultrasonic meter can be greatly extended under the premise of ensuring the measurement accuracy, further reducing the user's use cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only one embodiment of the present invention, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0023] Figure 1 : Schematic diagram of the FHL detecting the received wave when the peak amplitude of the wave received by the receiving end of the transducer is normal; Figure 2 : Schematic diagram of the first wave detection level detecting the received wave and "skipping wave" after the peak amplitude of the wave received by the receiving end of the transducer becomes smaller; Figure 3 : Flow chart of the on-line calibration method in the present invention; Specific implementation manner In this article, unless otherwise specified, the term "a plurality of" means two or more.

[0024] In this article, the character " / " means that the objects before and after are in an "or" relationship. For example, A / B means: A or B.

[0025] In this article, the term "and / or" is an associative relationship describing an object, indicating that three relationships can exist. For example, A and / or B means: A or B, or, the three relationships of A and B.

[0026] As Figure 2 shown, the peak amplitude of the ultrasonic wave received by the receiving end of an ultrasonic water meter decreases, and the built-in first wave detection level FHL AM misses the second received wave in the received wave sequence and erroneously detects the third received wave in the sequence as the first wave, thus causing the zero-crossing position to shift and the skipping wave phenomenon to occur.

[0027] An on-line calibration method for the first wave detection level of ultrasonic metering, which is applied to an ultrasonic meter, such as an ultrasonic water meter or an ultrasonic gas meter. In this embodiment, the calibration method is applied to an ultrasonic water meter and includes the steps: S1. Call the built-in first wave detection level FHL in the ultrasonic meter AM , and the first wave detection level FHL AM is used to detect the peak amplitude of the received wave. In this embodiment, the first wave detection level FHL AM is designed such that the first wave measured by the first wave detection level FHL AM is the Nth received wave in the received wave sequence of the corresponding transducer under static water environment and when the ultrasonic meter is in an unaged state, and N is not greater than 6, where N is preferably 1, 2, or 3. In this embodiment, N is taken as 2, that is, the first wave measured by the built-in first wave detection level FHL AM is the second received wave in the received wave sequence received by the transducer, which can avoid clutter interference and is beneficial to improving the metering accuracy; in other embodiments of the present invention, if there is no clutter or the clutter interference is small, N is taken as 1.

[0028] S2. The first wave detection level FHL AMDetect the level values AM1 to AMn corresponding to the peak amplitude values of several received waves in the first wave and the subsequent received wave sequence, and obtain the incremental difference ΔAMn = AMn - AMn-1 of the level values corresponding to the peak amplitudes of two adjacent received waves, where n ≥ 2; preferably, 2 ≤ n ≤ 6, and in this embodiment, n is taken as 4.

[0029] Among them, this step is carried out in a static water environment to reduce the influence of clutter.

[0030] S3. Obtain the ΔAMm with the largest absolute value in the incremental difference ΔAMn, where 2 ≤ m ≤ n; S4. Obtain the first wave detection level FHL after the first correction C : FHL C = AMm-1 + F1 * ΔAMm F1 is a proportionality coefficient, and 0 < F1 < 1. In this embodiment, 0.3 ≤ F1 ≤ 0.6.

[0031] S5. After calling the first wave detection level FHL after correction C record the flight time TOF1 to TOFb of the first wave and the received waves after the first wave in the received wave sequence received by the corresponding transducer, and obtain the flight time difference ΔTn = Tn - Tn-1 between two adjacent received waves; among them, the flight times TOF1 to TOFb of the received waves are all upward flight times or all downward flight times, which is beneficial to improving the detection accuracy.

[0032] S6. Compare the flight time difference ΔTn between two adjacent received waves with a set first threshold, and the first threshold is positively correlated with the waveform period of the received wave; in this embodiment, the first threshold is 30% to 70% of the waveform period. For example, when the operating frequency of the received wave is 1M and the waveform period is 1us, the first threshold value is taken as 0.3 to 0.7us.

[0033] S7. When the flight time difference ΔTn between two adjacent received waves is not greater than the first threshold, it is determined that the data is normal; when the flight time difference ΔTn between two adjacent received waves is greater than the first threshold, it is determined that the data is abnormal. Further, to evaluate the proportion of abnormal data and avoid false alarms or frequent further corrections, the flight time differences ΔTn between several consecutive adjacent received waves are compared with the set first threshold to determine whether the proportion of abnormal data exceeds the set second threshold. In this embodiment, the second threshold is set to 50%. In other embodiments of the present invention, the second threshold can be selected within the range of 30% to 60%.

[0034] Among them, when the ratio of abnormal data exceeds 50%, for further correction, the following steps are also included: S8. Call the first wave detection level FHL built in the ultrasonic meter AM; S9. Repeat the steps S2 and S3; S10. When ΔAMm is not greater than 20 mV, or not greater than half of ΔAMm in the first calibration step, determine how low the peak amplitude value of the received wave is and send an alarm signal; When ΔAMm is greater than 20 mV, or greater than half of ΔAMm in the first calibration step, obtain the first wave detection level FHLm after further calibration: FHLm = AMm - 1 + F * ΔAMm F is a proportionality coefficient, and 0 < F < 1. In this embodiment, 0.3 ≤ F1 ≤ 0.6. The flowchart of the online calibration method is as Figure 3 shown.

[0035] An electronic device includes a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, the online calibration method for the first wave detection level of ultrasonic metering as described above can be implemented.

[0036] A storage medium stores a computer program. When the computer program is executed by a processor, the online calibration method for the first wave detection level of ultrasonic metering as described above can be implemented.

[0037] A computer program product. When the instructions in the computer program product are executed by the processor of an electronic device, the electronic device executes the online calibration method for the first wave detection level of ultrasonic metering as described above.

[0038] The present invention has been described by way of example above, but the present invention is not limited to the above specific embodiments. Any modification or variation based on the present invention falls within the scope of protection required by the present invention.

Claims

1. An on-line calibration method for the first wave detection level of ultrasonic metering, characterized in that, Applied to an ultrasonic meter, including the steps: S1. Call the first wave detection level FHL built in the ultrasonic meter AM , where the first wave detection level FHL AM is used to detect the peak amplitude of the received wave, and the first wave detection level FHL AM is designed such that the measured first wave is the Nth received wave in the corresponding transducer reception sequence, and N is not greater than 6; S2. The first wave detection level FHL AM Detect the level values AM1 to AMn corresponding to the peak amplitude values of several received waves in the first wave and the subsequent received sequence, and obtain the incremental difference ΔAMn = AMn - AMn-1 of the level values corresponding to the peak amplitudes of two adjacent received waves, where n ≥ 2; S3. Obtain ΔAMm with the largest absolute value among the incremental differences ΔAMn, where 2 ≤ m ≤ n; S4. Obtain the first wave detection level FHL after the first calibration C : FHL C = AMm - 1 + F1 * ΔAMm F1 is a proportionality coefficient, and 0 < F1 < 1.

2. The online calibration method for the first wave detection level of ultrasonic metering according to claim 1, characterized in that, The first wave detection level FHL AM is designed such that the measured first wave is the Nth received wave in the transducer reception sequence under a static water environment and when the ultrasonic flowmeter is in an unaged state, and N is not greater than 6.

3. The online calibration method for the first wave detection level of ultrasonic metering according to claim 1, characterized in that, The N is not greater than 3.

4. The online calibration method for the first wave detection level of ultrasonic metering according to claim 1, characterized in that 0.3 ≤ F1 ≤ 0.

6.

5. The online calibration method for the first wave detection level of ultrasonic metering according to any one of claims 1 to 4, characterized in that, It further includes the steps: S5. Call the corrected first wave detection level FHL C After that, record the time of flight TOF1~TOFb of the received waves received by the corresponding transducer, and obtain the time of flight difference ΔTn = Tn - Tn-1 between two adjacent received waves; S6. Compare the time-of-flight difference ΔTn between two adjacent received waves with a set first threshold, and the first threshold is positively correlated with the waveform period of the received wave; S7. When the time-of-flight difference ΔTn between two adjacent received waves is not greater than the first threshold, it is determined that the data is normal; when the time-of-flight difference ΔTn between two adjacent received waves is greater than the first threshold, it is determined that the data is abnormal.

6. The online calibration method for the first wave detection level of ultrasonic metering according to claim 5, wherein The time-of-flight TOF1 to TOFb of the received waves are all the upward time-of-flight or all the downward time-of-flight.

7. The online calibration method for the first wave detection level of ultrasonic metering according to claim 5, characterized in that, Compare the time-of-flight differences ΔTn between several consecutive adjacent received waves with a set first threshold to determine whether the proportion of the abnormal data exceeds a set second threshold.

8. The online calibration method for the first wave detection level of ultrasonic metering according to claim 7, characterized in that, The second threshold is 30% - 60%.

9. The online calibration method for the first wave detection level of ultrasonic metering according to claim 7, characterized in that When the ratio of the abnormal data exceeds the set second threshold, it further includes the following steps: S8. Call the first wave detection level FHL built in the ultrasonic meter AM , call what is built in the ultrasonic meter; S9. Repeat the steps S2 and S3; S10. When ΔAMm is not greater than 20 mV, or not greater than half of ΔAMm in the first calibration step, an alarm signal is issued; when ΔAMm is greater than 20 mV, or greater than half of ΔAMm in the first calibration step, obtain the first-wave detection level FHLm after further calibration: FHLm = AMm - 1 + F * ΔAMm F is a proportionality coefficient, and 0 < F < 1.

10. An electronic device, characterized in that, It includes a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, it can implement the online calibration method for the first-wave detection level of ultrasonic metering as described in any one of claims 1 - 4, 6 - 9.

11. A storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it can implement the online calibration method for the first-wave detection level of ultrasonic metering as described in any one of claims 1 - 4, 6 - 9.

12. A computer program product, characterized in that, When the instructions in the computer program product are executed by the processor of the electronic device, the electronic device executes the online calibration method for the first-wave detection level of ultrasonic metering as described in any one of claims 1 - 4, 6 - 9.

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