CN112179428A - Ultrasonic water meter measurement model based on line-correlation algorithm - Google Patents
Ultrasonic water meter measurement model based on line-correlation algorithm Download PDFInfo
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- 238000005259 measurement Methods 0.000 title claims abstract description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 claims description 11
- 239000012530 fluid Substances 0.000 claims description 7
- UZMKOEWHQQPOBJ-UHFFFAOYSA-M sodium;2,3-dihydroxypropane-1-sulfonate Chemical compound [Na+].OCC(O)CS([O-])(=O)=O UZMKOEWHQQPOBJ-UHFFFAOYSA-M 0.000 claims description 4
- 238000012360 testing method Methods 0.000 claims description 4
- 238000012937 correction Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims description 2
- 238000004364 calculation method Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000007547 defect Effects 0.000 description 1
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- 230000008014 freezing Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
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- G06F30/20—Design optimisation, verification or simulation
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Abstract
The invention relates to the technical field of water meter measurement, in particular to an ultrasonic water meter measurement model based on a line-correlation algorithm. The invention has the beneficial effects that: the influence of temperature on ultrasonic measurement is greatly reduced, the measurement time can be saved, the hardware cost is saved, the production process flow is reduced, and the production efficiency and the measurement precision are improved.
Description
Technical Field
The invention relates to the technical field of water meter measurement, in particular to an ultrasonic water meter measurement model based on a line-correlation algorithm.
Background
In the prior art, most of ultrasonic water meters use a zero-crossing comparison method for measurement, temperature has great influence on the zero-crossing comparison method, and if the shielding time is set unreasonably, a wave error phenomenon is easily generated.
Therefore, the invention provides a line-correlation algorithm for calculating the time difference according to the phase difference, and the influence of the temperature on the ultrasonic measurement is greatly reduced.
Disclosure of Invention
The invention provides an ultrasonic water meter measurement model based on a line-correlation algorithm in order to make up the defect that the ultrasonic water meter measurement in the prior art is greatly influenced by temperature.
The invention is realized by the following technical scheme:
an ultrasonic water meter measurement model based on a line-correlation algorithm is characterized by comprising the following steps:
s1, detecting the propagation time of the ultrasonic wave in the base meter pipe section through a high-speed ADC in the time measuring module, and calculating the current temperature of the fluid through one-way time;
s2, measuring a relation formula of the fitting temperature and the ultrasonic wave sound wave transmission time through an oscilloscope;
s3, compensating USS _ ACOUSTIC _ LENGTH by using a relational formula to shield clutter in the period from sending to receiving to obtain accurate propagation time;
s4, calculating the volume flowing through the round tube in unit time by using a line-correlation algorithm;
and S5, carrying out interpolation calculation on the temperature and the flow rate, and integrating to obtain an accurate accumulated flow rate.
Further, in order to better implement the present invention, the time measurement module is an sdhs (sigma Delta High Speed adc) module in the MSP430FR 6047.
Further, in order to better implement the present invention, in S1, specifically, the waveform of the ultrasonic wave detected by the high-speed ADC in the SDHS module is input into the DTC module to obtain the flight time of the ultrasonic wave, and the temperature of the current fluid in the circular tube is obtained by calling the "USS _ computeTemperature" method in the "ussSWLib" library function.
Further, in order to better implement the present invention, the relational formula in S2 is: t = K12.365T-K156.3T +45, in which: t is the shielding time, T is the fluid temperature, and K is the temperature correction coefficient.
Further, in order to better implement the present invention, in S3, the USS _ ACOUSTIC _ LENGTH is a value of the ussSwLib _ userconfig.h file, which is a key parameter in the ultrasonic measurement process, and the value is corrected by a relational formula to optimize the sampling timing and obtain an accurate propagation time.
Further, in order to better implement the present invention, the S4 specifically is to perform a line-correlation operation through a "USS _ runalcorithms" function in a "ussSWLib" library function, so as to obtain a flow volume flowing through the circular tube per second.
Further, in order to better implement the present invention, in S5, the intensive test is performed on the entire flow rate interval by adjusting the temperature of the water in the detection platform, and the errors of different flow rate points from 0 ℃ to 35 ℃ are recorded; since all temperatures and flows cannot be tested, the intermediate temperature and flow points are blurred by interpolation.
The invention has the beneficial effects that:
the invention adopts a line-correlation algorithm to calculate the time difference according to the phase difference, thereby greatly reducing the influence of temperature on ultrasonic measurement, saving measurement time and hardware cost, reducing production process flow and improving production efficiency and measurement precision.
Drawings
FIG. 1 is a flow chart of an ultrasonic water meter measurement model based on a line-correlation algorithm according to the present invention;
fig. 2 is a structural diagram of an ultrasonic water meter measurement model based on a line-correlation algorithm according to the invention.
In the figure, a and b are ultrasonic transducers, and L is the center distance of the ultrasonic transducers.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "middle", "upper", "lower", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships conventionally laid out when products of the present invention are used, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it is to be noted that the terms "disposed", "connected" and "connected" are to be construed broadly and may be, for example, a fixed connection, an adjustable connection or an integral connection unless expressly stated or limited otherwise. Either mechanically or electrically. They may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Fig. 1-2 show an embodiment of the present invention, which is an ultrasonic water meter measurement model based on a line-correlation algorithm, and specifically includes the following steps:
firstly, transmitting the ultrasonic flight time T measured by the SDHS module into a USS _ computertemperature method to obtain the temperature T; wherein, the position of the method of "USS _ computeTemperature" is positioned in a file of "ussSwLibTemperature.c" in the library function "ussSWLib";
secondly, designing a temperature-adjustable device, pouring water into a base table with an ultrasonic transducer, freezing the temperature of the device at 0 ℃, monitoring the flight time of ultrasonic waves by using an oscilloscope, and then gradually increasing the temperature with the beat of 1 ℃ until the temperature reaches 35 ℃; a quadratic curve relation between the ultrasonic flight T and the temperature T is obtained.
Through a large amount of experimental data, the following formula is obtained:
t=K*12.365T²-K*156.3T+45-------------（1.1）
in the formula: t is the shielding time, T is the fluid temperature, and K is the correction coefficient;
thirdly, correcting the value of 'USS _ ACOUSTIC _ LENGTH' in the 'usSwLib _ userConfig.h' file by using a formula (1.1) to optimize the sampling time and obtain accurate propagation time, wherein 'USS _ ACOUSTIC _ LENGTH' is a key parameter in the ultrasonic measurement process;
and fourthly, performing line-correlation operation through a USS _ runAlgorithms function in the USS SWLib library function to obtain the volume of the flow flowing through the circular tube per second. The algorithm of the USS _ runAlgorithms function in the USS SWLib library function is modified according to the characteristics of the base table, and the specific modification method comprises the following steps: adjusting values OF a "PEAK-to-threshold RATIO (USS _ ALG _ RATIO _ OF _ TRACK _ loop)" in a "ussSwLib _ userconfig.h" file, a "number OF CYCLES OF a relevant PEAK (USS _ ALG _ NUM _ CYCLES _ SEARCH _ CORR)" and a "maximum PEAK variation RATIO (USS _ ALG _ MAX _ RATIO _ PEAK _2_ PEAK _ VAR)", wherein algorithm optimization can improve a range OF a maximum flow OF Q4, improve a range RATIO and accuracy, effectively offset an influence OF temperature variation on a static time difference, and further improve accuracy and robustness OF flow measurement; by this method, a stable time difference can be obtained;
and fifthly, calculating the flow by an interpolation algorithm. Carrying out intensive test on the whole flow interval by adjusting the temperature of water in the detection table, and recording errors of different flow points from 0 ℃ to 35 ℃; since it is not possible to test all temperatures and flows, the intermediate temperature and flow points are blurred out here by interpolation algorithms.
Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and other modifications or equivalent substitutions made by the technical solutions of the present invention by those of ordinary skill in the art should be covered within the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solutions of the present invention.
Claims (7)
1. An ultrasonic water meter measurement model based on a line-correlation algorithm is characterized by comprising the following steps:
s1, detecting the propagation time of the ultrasonic wave in the base meter pipe section through a high-speed ADC in the time measuring module, and calculating the current temperature of the fluid through one-way time;
s2, measuring a relation formula of the fitting temperature and the ultrasonic wave sound wave transmission time through an oscilloscope;
s3, compensating USS _ ACOUSTIC _ LENGTH by using a relational formula to shield clutter in the period from sending to receiving to obtain accurate propagation time;
s4, calculating the volume flowing through the round tube in unit time by using a line-correlation algorithm;
and S5, carrying out interpolation calculation on the temperature and the flow rate, and integrating to obtain an accurate accumulated flow rate.
2. An ultrasonic water meter flow measurement model according to claim 1, characterized in that:
the time measurement module is an SDHS module in MSP430FR 6047.
3. An ultrasonic water meter flow measurement model according to claim 1, characterized in that:
the S1 is specifically that the waveform of the ultrasonic wave detected by the high-speed ADC in the SDHS module is input to the DTC module to obtain the flight time of the ultrasonic wave, and the temperature of the current fluid in the circular tube is obtained by calling the "USS _ computeTemperature" method in the "ussSWLib" library function.
4. An ultrasonic water meter flow measurement model according to claim 1, characterized in that:
the relational formula in S2 is: t = K12.365T-K156.3T +45, in which: t is the shielding time, T is the fluid temperature, and K is the temperature correction coefficient.
5. An ultrasonic water meter flow measurement model according to claim 1, characterized in that:
in S3, the USS _ ACOUSTIC _ LENGTH is a value of the ussSwLib _ userconfig.h file, which is a key parameter in the ultrasonic measurement process, and the value is corrected by a relational formula to optimize sampling timing and obtain accurate propagation time.
6. An ultrasonic water meter flow measurement model according to claim 1, characterized in that:
the S4 is specifically that a row-related operation is performed through a "USS _ runalcorithms" function in a "ussSWLib" library function, and a flow volume flowing through the circular tube per second is obtained.
7. An ultrasonic water meter flow measurement model according to claim 1, characterized in that:
the S5 concrete method comprises the steps of carrying out intensive test on the whole flow interval by adjusting the temperature of water in a detection table, and recording errors of different flow points from 0 ℃ to 35 ℃; since all temperatures and flows cannot be tested, the intermediate temperature and flow points are blurred by interpolation.
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| WO2001026068A1 (en) * | 1999-10-06 | 2001-04-12 | Sensoria Corporation | Wireless networked sensors |
| CN106441520A (en) * | 2016-10-26 | 2017-02-22 | 齐鲁工业大学 | Method for calibrating precision of small-caliber ultrasonic water meter and calibration system thereof |
| CN106706056A (en) * | 2017-03-07 | 2017-05-24 | 济南瑞泉电子有限公司 | Compensation method for flow rate measuring of large-caliber ultrasonic water meter |
| CN109855692A (en) * | 2019-01-28 | 2019-06-07 | 江苏商贸职业学院 | A kind of method of computer metering fluid flow |
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| EP3617678A1 (en) * | 2018-08-30 | 2020-03-04 | Nxp B.V. | Apparatus for determination of temperature |
-
2020
- 2020-09-15 CN CN202010968317.XA patent/CN112179428A/en active Pending
Patent Citations (6)
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|---|---|---|---|---|
| WO2001026068A1 (en) * | 1999-10-06 | 2001-04-12 | Sensoria Corporation | Wireless networked sensors |
| CN106441520A (en) * | 2016-10-26 | 2017-02-22 | 齐鲁工业大学 | Method for calibrating precision of small-caliber ultrasonic water meter and calibration system thereof |
| CN106706056A (en) * | 2017-03-07 | 2017-05-24 | 济南瑞泉电子有限公司 | Compensation method for flow rate measuring of large-caliber ultrasonic water meter |
| EP3617678A1 (en) * | 2018-08-30 | 2020-03-04 | Nxp B.V. | Apparatus for determination of temperature |
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Non-Patent Citations (3)
| Title |
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| TEXAS INSTRUMENTS: "Application Software (SW) Architecture for MSP430FR6047-Based Ultrasonic Water Flow Meter", 《HTTPS://WWW.BAIDU.COM/LINK?URL=6ALUTO_1YZQUMLP31RYF5SAOH9QR_T1EP1TWJOPWH5O0QQSQJN4XDZK1B6LQ78DXJ_SJ27E2TAVSVEIKV0SRCZCVZ4OZFDMDKGY_PBOQ7&WD=&EQID=E0E96F44000AFE1B000000026231F337》 * |
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Application publication date: 20210105 |