CN112577558B - Ultrasonic flow metering system and edge equipment based on cloud edge computing - Google Patents
Ultrasonic flow metering system and edge equipment based on cloud edge computing Download PDFInfo
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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
- G01F1/667—Arrangements of transducers for ultrasonic flowmeters; Circuits for operating 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
- G01F15/02—Compensating or correcting for variations in pressure, density or temperature
- G01F15/04—Compensating or correcting for variations in pressure, density or temperature of gases to be measured
- G01F15/043—Compensating or correcting for variations in pressure, density or temperature of gases to be measured using electrical means
- G01F15/046—Compensating or correcting for variations in pressure, density or temperature of gases to be measured using electrical means involving digital counting
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K17/00—Measuring quantity of heat
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- H04L67/01—Protocols
- H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
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- H04Q9/00—Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom
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Abstract
The invention relates to an ultrasonic flow metering system based on cloud edge computing and edge equipment, wherein the system comprises a terminal acquisition computing device, edge equipment and a cloud edge, and the edge equipment stores data transmitted by the terminal acquisition computing device; the data comprise pressure and temperature in the flow channel, forward flow flight time and reverse flow flight time; according to the pressure and the temperature in the flow channel, calculating to obtain a corresponding pressure compensation coefficient and a temperature compensation coefficient, and feeding the corresponding pressure compensation coefficient and temperature compensation coefficient to the cloud; and calculating to obtain a flight time difference according to the forward flight time and the backward flight time, and uploading the flight time difference to the cloud. The large calculation amount of the system is completed in the cloud and the edge equipment, the tail end acquisition and calculation device only needs to complete light calculation, the working time of the tail end acquisition and calculation device is reduced, the low power consumption requirement of the tail end acquisition and calculation device is met, and the product performance is improved; meanwhile, the system can update the whole network by utilizing the cloud end to acquire the algorithm and the like stored in the computing device and the edge equipment, and is convenient and quick.
Description
Technical Field
The invention belongs to the technical field of ultrasonic computing, and particularly relates to an ultrasonic flow metering system and edge equipment based on cloud edge computing.
Background
The gas ultrasonic flow measurement utilizes the signal modulation effect of natural gas flow on ultrasonic pulses, and flow information is obtained by detecting the change of signals. Along with the improvement of the performance and the price reduction of the ultrasonic transducer, the development of computer technology and fluid mechanics and the development and application of the ultrasonic metering technology in the field of thermal measurement (natural gas meter, water meter, heat meter and the like) are greatly improved.
In the prior art, a time difference method is adopted for ultrasonic flow measurement, for example, a schematic diagram of a time difference method ultrasonic flowmeter is shown in fig. 1. Two ultrasonic transducers A, B are arranged on the pipe wall and form an angle theta with the pipe wall, wherein V is the gas flow velocity in the figure, and c is the sound velocity of ultrasonic waves under the static condition; the ultrasonic pulse is transmitted from A to B in forward flow, the transmission time is T1, the transmission time is T2 in backward flow from B to A, one flight time difference between the backward flow and the forward flow is deltat, and the simplified functional relation expression is: Where d is the diameter of the pipe or the height of the pipe. From this equation, it can be seen that the ultrasonic flow V is related to the time-of-flight difference Δt.
The existing ultrasonic flow calculation method is realized in a terminal acquisition and calculation device, and the terminal acquisition and calculation device generally comprises a processing module, a communication module and a data acquisition module, wherein the data acquisition module acquires data required by ultrasonic flow calculation according to requirements, processes the data through the processing module to calculate the ultrasonic flow, and sends the calculated ultrasonic flow out through the communication module. That is, the terminal acquisition computing device is required to realize data acquisition, data calculation and data transmission, and the method clearly makes the processing pressure of the terminal acquisition computing device extremely high, and has high requirements on the computing speed and the computing capacity of the processing module.
Disclosure of Invention
The invention provides an ultrasonic flow metering system based on cloud edge computing and edge equipment, which are used for solving the problem that the processing pressure of a terminal acquisition computing device is high because the ultrasonic flow computing is realized by the terminal acquisition computing device.
In order to solve the technical problems, the technical scheme and the beneficial effects of the invention are as follows:
The invention discloses an ultrasonic flow metering system based on cloud edge calculation, which comprises a terminal acquisition and calculation device, edge equipment and a cloud edge; the terminal acquisition and calculation device acquires the pressure and the temperature in the flow channel and transmits the pressure and the temperature to the edge equipment; collecting an excitation signal in a forward flow direction and a receiving signal in a backward flow direction, calculating to obtain forward flow flight time according to the excitation signal in the forward flow direction and the receiving signal in the backward flow direction, calculating to obtain backward flow flight time according to the excitation signal in the backward flow direction and the receiving signal in the backward flow direction, and transmitting the forward flow flight time and the backward flow flight time to the edge equipment; the edge equipment stores the data transmitted by the terminal acquisition computing device; according to the pressure and the temperature in the flow channel, calculating to obtain a corresponding pressure compensation coefficient and a temperature compensation coefficient, and feeding the corresponding pressure compensation coefficient and temperature compensation coefficient to the cloud; according to the forward flow flight time and the reverse flow flight time, calculating to obtain a flight time difference, and uploading the flight time difference to a cloud; the cloud end calculates and obtains the ultrasonic flow according to the pressure compensation coefficient, the temperature compensation coefficient and the flight time difference and the calculation relation among the ultrasonic flow, the pressure compensation coefficient, the temperature compensation coefficient and the flight time difference stored in the cloud end.
The beneficial effects are that: the system comprises a terminal acquisition and calculation device, edge equipment and a cloud end, wherein the edge equipment shares the work of the terminal acquisition and calculation device, performs preprocessing work on various data acquired by the terminal acquisition and calculation device, calculates corresponding pressure compensation coefficients and temperature compensation coefficients according to pressure and temperature in a flow channel, calculates a flight time difference according to forward flow flight time and reverse flow flight time, and sends the pressure compensation coefficients, the temperature compensation coefficients and the flight time difference to the cloud end for the cloud end to perform ultrasonic flow calculation. The large calculation amount of the system is completed in the cloud and the edge equipment, the tail end acquisition and calculation device only needs to complete light calculation, the working time of the tail end acquisition and calculation device is reduced, the low power consumption requirement of the tail end acquisition and calculation device is met, and the product performance is improved; meanwhile, the system can update the whole network of the terminal acquisition computing device, the algorithm stored in the edge equipment and the like by utilizing the cloud, is convenient and quick, and can obtain high-precision ultrasonic flow detection at low computing cost.
The invention relates to edge equipment for ultrasonic flow calculation, which stores data transmitted by a terminal acquisition and calculation device; the data comprise pressure and temperature in the flow channel, downstream flight time and countercurrent flight time; according to the pressure and the temperature in the flow channel, a corresponding pressure compensation coefficient and a temperature compensation coefficient are obtained through calculation and are sent to the cloud end; and calculating to obtain a flight time difference according to the forward flight time and the backward flight time, and uploading the flight time difference to the cloud.
The beneficial effects are that: the edge equipment shares the work of the tail end acquisition and calculation device, performs preprocessing work on various data acquired by the tail end acquisition and calculation device, and comprises the steps of calculating a corresponding pressure compensation coefficient and a temperature compensation coefficient according to the pressure and the temperature in a flow channel, calculating a time of flight difference according to forward flow time of flight and reverse flow time of flight, and sending the pressure compensation coefficient, the temperature compensation coefficient and the time of flight difference to a cloud for the cloud to perform ultrasonic flow calculation, so that the low power consumption requirement of the tail end acquisition and calculation device is met, and the product performance is improved; meanwhile, the edge equipment is used as an intermediate transmission medium of the cloud end and the tail end acquisition and calculation device, and can update the whole network of the tail end acquisition and calculation device, an algorithm stored in the edge equipment and the like by using the cloud end, so that the ultrasonic flow detection device is convenient and quick, and high-precision ultrasonic flow detection is obtained at low calculation cost.
As further improvement of the edge equipment and the system, in order to slow down the processing pressure of the tail end acquisition computing device and the cloud end, the edge equipment also adopts a filtering algorithm to filter the downstream flight time and the countercurrent flight time, and the flight time difference is obtained through calculation according to the downstream flight time and the countercurrent flight time after the filtering.
As a further improvement of the edge device and system, the filtering algorithm is a sliding average filtering algorithm.
As a further improvement of the system, the tail end acquisition and calculation device calculates the downstream flight time by adopting a cross-correlation algorithm according to the excitation signal and the receiving signal in the downstream direction; and calculating the countercurrent flight time by adopting a cross-correlation algorithm according to the excitation signal and the receiving signal in the countercurrent direction.
As a further improvement of the system, the edge device also analyzes the components of the gas and the content ratio thereof and sends the components to the cloud; the cloud end calculates and obtains the heat of the gas to be metered according to the components and the content ratio of the gas, the heat value of the gas stored in the cloud end and the calculated ultrasonic flow; or the edge equipment also analyzes the components and the content proportion of the gas, and calculates the heat of the gas to be metered according to the components and the content proportion of the gas, the heat value of various gases locally stored or transmitted by a cloud, and the calculated ultrasonic flow; and the cloud end sends the calculated ultrasonic flow and the stored heat values of various gases to the edge equipment.
As a further improvement of the edge device, the edge device also acquires the components of the gas and the content ratio thereof and sends the components to the cloud.
As a further improvement of the edge device, the edge device also analyzes the components and the content ratio of the gas, and calculates the heat of the gas to be metered according to the components and the content ratio of the gas, the heat values of various gases transmitted by a local storage or cloud, and the calculated ultrasonic flow.
Drawings
FIG. 1 is a schematic diagram of a prior art ultrasonic flow calculation;
FIG. 2 is a block diagram of an ultrasonic flow metering system in a system embodiment of the present invention;
FIG. 3 is a flow chart of a cross-correlation calculation method in a system embodiment of the invention.
Detailed Description
System embodiment:
The embodiment provides an ultrasonic flow metering system based on cloud-edge computing, and a block diagram of the system is shown in fig. 2. The system comprises a terminal acquisition computing device, edge equipment and a cloud end.
1. Terminal acquisition and calculation device: the device comprises a first processing module, a temperature detection module, a pressure detection module, an ultrasonic metering module and a first communication module.
1. The temperature detection module can be a temperature sensor, is arranged inside the flow channel and is used for detecting the temperature value T (which is a value changing continuously along with time) of the flow channel; the pressure detection module can be a temperature sensor, is arranged inside the flow channel and is used for detecting the temperature value P (which is a value changing continuously along with time) of the flow channel; the temperature detection module and the pressure detection module transmit the detected flow channel temperature value T and the flow channel temperature value P to the processing module for processing by the processing module. The ultrasonic metering module is used for collecting the excitation signal and the receiving signal in the forward direction and the excitation signal and the receiving signal in the backward direction, and transmitting the signals to the super-processing module for calculation processing by the processing module.
2. The first processing module may be an MCU, and calculate, according to the excitation signal and the reception signal in the forward direction, the forward flight time T1 by using a cross-correlation algorithm, calculate, according to the excitation signal and the reception signal in the reverse direction, the reverse flight time T2 by using a cross-correlation algorithm, and transmit the forward flight time T1 and the reverse flight time T2 to the first communication module. The first processing module does not process the collected P and T any more and directly transmits the collected P and T to the first communication module. The principle of the cross-correlation algorithm is that the time of flight corresponding to the peak value of the cross-correlation function is calculated through the cross-correlation function of the two signals, so as to obtain the time of flight difference deltat, the specific process is described below by taking the downstream time of flight T1 as an example, and the process is shown in fig. 3, and the principle of calculating the upstream time of flight T2 is the same as that of the downstream time of flight T. Specific:
1) The first processing module sends an excitation signal in the forward direction, and records the sending time t1, and excitation signal sample data: x (X0, X1,) Xn-1;
2) The transducer generates an ultrasonic signal under the action of an excitation signal and sends the ultrasonic signal to the opposite transducer, the first processing module starts receiving sampling, captures the signal received by the transducer, and samples data Y (Y0, Y1, ym-1);
3) The sampling frequency is determined, the sampling time of each signal is also determined, and the cross-correlation algorithm is utilized to calculate R xy (k) = Σx (n) Y (n-k) and determine the peak value of the signal, thereby determining the sampling time tw of the peak signal; wherein m=n+m, k=0, 1,2,..m-1, r xy (k) is 2M-1 in length; if the lengths of the sequence X and the sequence Y are not equal, the short sequence is complemented with 0;
4) Calculating downstream flight time: t1=tw-T1.
3. The first communication module is responsible for data interaction with the edge device, and can send the flow channel temperature value T, the flow channel temperature value P, the downstream flight time T1 and the upstream flight time T2 to the edge device, and can also receive data/commands transmitted by the edge device.
In the terminal acquisition computing device, the cross-correlation algorithm is adopted to carry out localization processing on data, and the data which is tightly coupled with equipment and the algorithm are subjected to localization and light weight processing, so that the data processing efficiency is improved, invalid data or error data is avoided, the uploading of the error data and the invalid data to the cloud is reduced, the generation of junk data is avoided, and the metering of other equipment is influenced; the working time of the equipment is reduced by light weight treatment, and the power consumption of the product is reduced.
2. Edge device: the system comprises a second processing module, a second communication module, a third communication module, a local data storage module and a heat value detection/analysis module.
1. The second communication module is a local communication module, and realizes data interaction with the terminal acquisition computing device. The communication module receives the flow channel temperature value T, the flow channel temperature value P, the downstream flight time T1 and the upstream flight time T2 transmitted by the terminal acquisition and calculation device, and transmits the flow channel temperature value T, the flow channel temperature value P, the downstream flight time T1 and the upstream flight time T2 to the second processing module for processing by the second processing module.
2. The second processing module may be an MCU, and is responsible for processing and preprocessing the received data from the terminal acquisition computing device, and transmitting the processed and preprocessed data to the third communication module. The specific processing pretreatment process comprises the following steps:
1) And filtering the downstream flight time T1 and the upstream flight time T2 by adopting a sliding average value filtering algorithm to obtain the filtered downstream flight time T1 and the upstream flight time T2 so as to lighten the calculation work of a large amount of data of the terminal acquisition and calculation device and obtain an effective sampling value, thereby determining the flight time difference delta t=T1 '-T2' according to the filtered downstream flight time T1 'and the upstream flight time T2', and transmitting the obtained flight time difference delta T to a third communication module. The sliding average value filtering algorithm is to calculate the average value of the received primary sampling value and the past N-1 values together, and the ring-shaped queue structure is adopted, so that the algorithm is not repeated because the algorithm is in the prior art.
2) And a temperature and pressure compensation algorithm is adopted to calculate and obtain a corresponding temperature compensation coefficient k T and a pressure compensation coefficient k P according to the flow channel temperature value T and the flow channel temperature value P so as to provide more accurate data for a cloud end, and the obtained temperature compensation coefficient k T and pressure compensation coefficient k P are transmitted to a third communication module. The temperature and pressure compensation algorithm is a general algorithm, and working conditions and standard condition data under various temperature and pressure conditions can be processed through a pre-stored algorithm model to obtain a temperature compensation coefficient k T and a pressure compensation coefficient k P corresponding to the flow channel temperature value T and the flow channel temperature value P.
3. The heat value analysis/detection module is integrally arranged in the edge equipment and can analyze the components of the gas to obtain which gas is contained and the ratio of the gas.
4. The local data storage module stores the data sent by the terminal acquisition computing device into a buffer zone N, when the data is stored, the data stored for the longest time is replaced, and the N data in the buffer zone are always the latest data.
5. The third communication module is a remote communication module, and data interaction with the cloud is achieved. The communication module sends the temperature compensation coefficient k T, the pressure compensation coefficient k P, the flight time difference delta t, the components of the gas and the content proportion of the components to the cloud end, and the components are subjected to calculation processing by the cloud end to obtain the ultrasonic flow F. The setting of the edge equipment meets the low power consumption requirement of the terminal acquisition and calculation device, can reduce the direct communication between the terminal acquisition and calculation device and the cloud platform, reduces frequent data communication, and ensures the metering precision of each terminal equipment when the cloud platform cannot be connected.
3. Cloud: the system comprises a third processing module, a fourth communication module and a network storage module.
1. And the fourth communication module realizes data interaction with the edge equipment. The communication module receives the temperature compensation coefficient k T, the pressure compensation coefficient k P and the flight time difference deltat transmitted by the edge equipment, and transmits the temperature compensation coefficient k T, the pressure compensation coefficient k P and the flight time difference deltat to the third processing module for analysis and calculation by the third processing module. And the cloud end can also download the updated algorithm to the edge equipment through the communication module, so that the whole network update is realized, and the method is convenient and quick.
2. The third processing module may be an MCU, and stores a calculation relation F between the ultrasonic flow F, the pressure compensation coefficient k P, the temperature compensation coefficient k T, and the time difference of flight, where f=f (Δt, k T,kp), and further the ultrasonic flow F may be calculated according to the temperature compensation coefficient k T, the pressure compensation coefficient k P, the time difference of flight Δt, and the calculation relation F. Specifically, the calculation relation f can be obtained according to a pre-stored algorithm model and a large number of historical data of ultrasonic flow, pressure compensation coefficient, temperature compensation coefficient, flight time difference and ultrasonic flow. The heat value of the gas can be calculated according to the heat value, the calculated ultrasonic flow (which can be converted into the corresponding gas volume) and the gas content ratio sent by the edge equipment. And a foundation is conveniently laid for subsequent heat charging.
3. The network storage module stores data from the edge device.
The operation of the system will be described in detail.
Firstly, an end acquisition and calculation device acquires pressure P and temperature T in a flow channel, an excitation signal and a receiving signal in a forward flow direction, and an excitation signal and a receiving signal in a reverse flow direction, calculates forward flow flight time T1 by adopting a cross-correlation algorithm according to the excitation signal and the receiving signal in the forward flow direction, calculates reverse flow flight time T2 by adopting the cross-correlation algorithm according to the excitation signal and the receiving signal in the reverse flow direction, and transmits a flow channel temperature value T, a flow channel temperature value P, the forward flow flight time T1 and the reverse flow flight time T2 to edge equipment through a first communication module.
Then, the edge equipment receives the flow channel temperature value T, the flow channel temperature value P, the downstream flight time T1 and the upstream flight time T2 transmitted by the tail end acquisition and calculation device through the second communication module, and firstly stores the data, if the storage space is insufficient, only the oldest data is required to be covered; then, filtering the forward flow flight time T1 and the reverse flow flight time T2 by adopting a sliding average value filtering algorithm to obtain a filtered forward flow flight time T1 'and a filtered reverse flow flight time T2', and calculating to obtain a flight time difference delta t=T1 '-T2'; then adopting a temperature-pressure compensation algorithm to convert the flow channel temperature value T and the flow channel temperature value P into a corresponding temperature compensation coefficient k T and a pressure compensation coefficient k P; the time-of-flight difference Δt, the temperature compensation coefficient k T and the pressure compensation coefficient k P are transmitted to the cloud via a third communication module.
Finally, the cloud receives the flight time difference Δt, the temperature compensation coefficient k T and the pressure compensation coefficient k P through the fourth communication module, and calculates the corresponding ultrasonic flow f=f (Δt, k T,kp) according to the calculation relation F stored in the cloud.
And moreover, the cloud can update the algorithms stored in the edge equipment and the tail end acquisition computing device through the fourth communication module, so that the whole network is updated, convenience and quickness are realized, and a large amount of manpower and material resources are saved.
It should be noted that, the first processing module, the second processing module, and the third processing module in this embodiment may be single-core processors, or may be multi-core processors, or even multiple processors. In addition, in the implementation, a sliding average value filtering algorithm is adopted to filter the forward flow flight time and the backward flow flight time, and other existing filtering algorithms in the prior art can also be adopted to filter the forward flow flight time and the backward flow flight time.
In the embodiment, the components and the content ratio of the gas are analyzed through the edge equipment, the components and the content ratio of the gas are sent to the cloud end, and the cloud end calculates the heat of the gas to be metered according to the components and the content ratio of the gas, the heat value of the gas stored in the cloud end and the calculated ultrasonic flow. As other embodiments, the specific gas heat calculation is also completed in the edge device, that is, the edge device stores the heat value table of various gases or updates the heat index table stored in the cloud to the edge device, and at the same time, the cloud needs to send the calculated ultrasonic flow to the edge device together, so that the edge device can calculate the heat of the gas to be measured according to the component and the content ratio of the gas, the heat value of various gases locally stored or transferred by the cloud, and the calculated ultrasonic flow after analyzing the component and the content ratio of the gas.
Edge device embodiment:
the embodiment provides an edge device for ultrasonic flow calculation, which is the edge device in the embodiment of the system, and the description of the edge device in the embodiment is sufficiently clear, and is not repeated herein.
While the present invention has been described in detail through the foregoing description of the preferred embodiment, it should be understood that the foregoing description is not to be considered as limiting the invention. Many modifications and substitutions of the present invention will become apparent to those of ordinary skill in the art upon reading the foregoing. Accordingly, the scope of the invention should be limited only by the attached claims.
Claims (4)
1. An ultrasonic flow metering system based on cloud edge computing is characterized by comprising a terminal acquisition computing device, edge equipment and a cloud edge;
The terminal acquisition and calculation device acquires the pressure and the temperature in the flow channel and transmits the pressure and the temperature to the edge equipment; collecting an excitation signal in a forward flow direction and a receiving signal in a backward flow direction, calculating to obtain forward flow flight time according to the excitation signal in the forward flow direction and the receiving signal in the backward flow direction, calculating to obtain backward flow flight time according to the excitation signal in the backward flow direction and the receiving signal in the backward flow direction, and transmitting the forward flow flight time and the backward flow flight time to the edge equipment;
The edge equipment stores the data transmitted by the terminal acquisition computing device; according to the pressure and the temperature in the flow channel, calculating to obtain a corresponding pressure compensation coefficient and a temperature compensation coefficient, and feeding the corresponding pressure compensation coefficient and temperature compensation coefficient to the cloud; according to the forward flow flight time and the reverse flow flight time, calculating to obtain a flight time difference, and uploading the flight time difference to a cloud; the edge equipment also analyzes the components of the gas and the content proportion thereof, and sends the components to the cloud;
The cloud calculates and obtains ultrasonic flow according to the pressure compensation coefficient, the temperature compensation coefficient and the flight time difference and the calculation relation among the ultrasonic flow, the pressure compensation coefficient, the temperature compensation coefficient and the flight time difference stored in the cloud; and the cloud end calculates the heat of the gas to be metered according to the components and the content ratio of the gas, the heat value of the gas stored in the cloud end and the calculated ultrasonic flow.
2. The ultrasonic flow metering system based on cloud edge computing as claimed in claim 1, wherein the edge device further adopts a filtering algorithm to filter the downstream flight time and the upstream flight time, and calculates a flight time difference according to the filtered downstream flight time and the filtered upstream flight time.
3. The cloud-edge computing-based ultrasonic flow metering system of claim 2, wherein the filtering algorithm is a sliding average filtering algorithm.
4. The ultrasonic flow metering system based on cloud edge computing as claimed in claim 1, wherein the terminal acquisition computing device calculates forward flow flight time by a cross-correlation algorithm according to an excitation signal and a receiving signal in a forward flow direction; and calculating the countercurrent flight time by adopting a cross-correlation algorithm according to the excitation signal and the receiving signal in the countercurrent direction.
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