CN116295149A - Pipeline bubble size measurement system based on time difference type ultrasonic flowmeter - Google Patents
Pipeline bubble size measurement system based on time difference type ultrasonic flowmeter Download PDFInfo
- Publication number
- CN116295149A CN116295149A CN202310094241.6A CN202310094241A CN116295149A CN 116295149 A CN116295149 A CN 116295149A CN 202310094241 A CN202310094241 A CN 202310094241A CN 116295149 A CN116295149 A CN 116295149A
- Authority
- CN
- China
- Prior art keywords
- ultrasonic transducer
- ultrasonic
- upstream
- module
- pipeline
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000005259 measurement Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 claims abstract description 90
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 90
- 238000012545 processing Methods 0.000 claims abstract description 27
- 238000009434 installation Methods 0.000 claims abstract description 14
- 238000001514 detection method Methods 0.000 claims description 36
- 230000005284 excitation Effects 0.000 claims description 23
- 238000001914 filtration Methods 0.000 claims description 12
- 230000005540 biological transmission Effects 0.000 claims description 7
- 239000007788 liquid Substances 0.000 description 11
- 238000010586 diagram Methods 0.000 description 6
- 238000002604 ultrasonography Methods 0.000 description 5
- 239000012530 fluid Substances 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B17/00—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations
-
- 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
-
- 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
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Electromagnetism (AREA)
- Measuring Volume Flow (AREA)
Abstract
The invention discloses a pipeline bubble size measurement system based on a time difference type ultrasonic flowmeter, which comprises a data acquisition unit and a data processing unit; the data acquisition unit comprises an ultrasonic flowmeter and a control unit, the ultrasonic flowmeter comprises an ultrasonic transducer, the ultrasonic transducer comprises a first upstream ultrasonic transducer, a second upstream ultrasonic transducer and a first downstream ultrasonic transducer, the first upstream ultrasonic transducer and the first downstream ultrasonic transducer are arranged on a pipeline through a v method, and the second upstream ultrasonic transducer and the first downstream ultrasonic transducer form a z-method installation structure on the pipeline; the ultrasonic flowmeter is electrically connected with the control unit, and the control unit is electrically connected with the data processing unit. The invention utilizes the principle that the flow rate cannot be obtained by the flowmeter when bubbles exist on an ultrasonic wave propagation path, carries out ultrasonic transducer installation by using a v method and a z method simultaneously, and calculates the size of the bubbles by utilizing the spatial relation of ultrasonic wave propagation.
Description
Technical Field
The invention relates to a measuring system, in particular to a pipeline bubble size measuring system based on a time difference type ultrasonic flowmeter.
Background
Currently, when delivering a quantity of liquid through a pipe, the liquid volume is usually determined by controlling the flow rate; however, when the liquid flows in the pipeline at a certain flow rate, bubbles are inevitably generated, and the bubbles can cause errors in the required flow rate, so that the use is finally affected; therefore, measuring the size of bubbles in a pipeline is of some necessity and value.
An ultrasonic transducer, hereinafter referred to as an ultrasonic transducer, is an energy conversion device that converts alternating electrical signals into acoustic signals in an ultrasonic frequency range, or converts acoustic signals in an external sound field into electrical signals; the transceiver-type ultrasonic transducer can transmit ultrasonic waves and receive ultrasonic signals.
The time difference type ultrasonic flowmeter measures the speed of fluid by utilizing ultrasonic waves, and calculates the flow rate by receiving the ultrasonic time difference of two ultrasonic transducers; when an ultrasonic beam propagates in a liquid, the flow of the liquid will cause a small change in propagation time, the ultrasonic wave will flow faster in the forward direction and slower in the reverse direction of the flow rate of the liquid, and the change in propagation time will be proportional to the flow rate of the liquid.
The time difference type ultrasonic flowmeter generally has two ultrasonic transducer probe mounting methods, namely v-method mounting and z-method mounting; as shown in fig. 3, in v-method installation, a point is determined first, and another point is measured at the horizontal position of the installation distance; as shown in figure 2, the z-method is to determine one point, measure out the other point at the horizontal position according to the installation distance, and then measure out the symmetrical point of the point at the other side of the pipeline.
When the flow rate of the liquid is measured by ultrasonic waves, if the measured fluid contains bubbles, the bubbles in the measured fluid scatter and absorb the ultrasonic waves; therefore, when bubbles appear on the ultrasonic propagation path, the ultrasonic propagation of the liquid medium in the pipeline can be seriously affected, so that the receiving sensor cannot receive signals, and finally the ultrasonic flowmeter cannot obtain the flow rate.
Therefore, in order to solve the problem that a single large bubble exists in a stable flowing liquid pipeline, resulting in errors in final flow estimation, and the bubble size cannot be measured, a pipeline bubble size measurement system based on a time-difference type ultrasonic flowmeter is needed.
Disclosure of Invention
The invention provides a pipeline bubble size measuring system based on a time difference type ultrasonic flowmeter, aiming at the defects in the prior art, so as to solve the problem that the final flow estimation is error and the bubble size cannot be measured due to the existence of a single larger bubble in a stable flowing liquid pipeline.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
pipeline bubble size measurement system based on time difference formula ultrasonic flowmeter, its characterized in that: the system comprises a data acquisition unit and a data processing unit; the data acquisition unit comprises an ultrasonic flowmeter and a control unit, the ultrasonic flowmeter comprises a plurality of ultrasonic transducers, the ultrasonic transducers comprise a first upstream ultrasonic transducer, a second upstream ultrasonic transducer and a first downstream ultrasonic transducer, the first upstream ultrasonic transducer and the first downstream ultrasonic transducer are arranged on a pipeline through a v method, and the second upstream ultrasonic transducer and the first upstream ultrasonic transducer are symmetrically arranged opposite to the first upstream ultrasonic transducer with respect to the pipeline and form a z-method installation structure with the first downstream ultrasonic transducer; the first upstream ultrasonic transducer, the second upstream ultrasonic transducer and the first downstream ultrasonic transducer are respectively and electrically connected with the control unit, and the control unit is electrically connected with the data processing unit.
In order to optimize the technical scheme, the specific measures adopted further comprise:
further, the control unit comprises a matching circuit, an enabling control module, an excitation pulse module, a threshold detection module, a receiving and transmitting time sequence control module, a DSP control module, a high-precision timing module, a filtering and amplifying module and a zero crossing detection module; the first upstream ultrasonic transducer is respectively and electrically connected with the enabling control module and the receiving and transmitting time sequence control module through the matching circuit, the second upstream ultrasonic transducer is respectively and electrically connected with the enabling control module and the receiving and transmitting time sequence control module through the matching circuit, and the first downstream ultrasonic transducer is electrically connected with the receiving and transmitting time sequence control module through the matching circuit; the DSP control module is used for controlling the excitation pulse module, transmitting data signals to the threshold detection module, carrying out data transmission with the high-precision timing module and carrying out data transmission with the data processing unit; the excitation pulse module is used for sending an enabling signal to the enabling control module and sending an excitation signal to the threshold detection module and the receiving and transmitting time sequence control module; the enabling control module is used for controlling the operation of the first upstream ultrasonic transducer or the second upstream ultrasonic transducer; the receiving and transmitting time sequence control module is used for controlling the receiving and transmitting states of the first upstream ultrasonic transducer, the second upstream ultrasonic transducer and the first downstream ultrasonic transducer and transmitting the obtained signals to the filtering and amplifying module; the filtering and amplifying module is used for transmitting the signal which reaches the requirement of the measured amplitude through the filtering and amplifying module to the zero-crossing detection module; the zero-crossing detection module is used for transmitting the processed signal to the high-precision timing module; the threshold detection module is used for receiving the signal of the DSP control module, detecting the threshold of the excitation signal and transmitting the information to the high-precision timing module; the high-precision timing module is used for determining the transmitting time of the ultrasonic wave through the signal transmitted by the threshold detection module, and determining the receiving time of the ultrasonic wave through the signal transmitted by the zero-crossing detection module. The matching circuit is connected with an inductor in series and is used for realizing tuning.
Further, the DSP control module adopts a TMS320F28335 chip.
Further, the receiving and transmitting time sequence control module consists of two AD7501 multipath switch chips.
Further, the high precision timing module is controlled by the MS1022P chip.
Further, the data processing unit adopts an upper computer developed based on a LabView platform.
Further, two groups of ultrasonic transducers are arranged, one group of ultrasonic transducers comprises a first upstream ultrasonic transducer, a second upstream ultrasonic transducer and a first downstream ultrasonic transducer, the other group of ultrasonic transducers comprises a third upstream ultrasonic transducer, a fourth upstream ultrasonic transducer and a second downstream ultrasonic transducer, the third upstream ultrasonic transducer and the second downstream ultrasonic transducer are arranged on a pipeline through a v method, and the fourth upstream ultrasonic transducer and the third upstream ultrasonic transducer are symmetrically arranged opposite to the third upstream ultrasonic transducer with respect to the pipeline and form a z method mounting structure with the second downstream ultrasonic transducer.
Further, the detection surfaces of the two groups of ultrasonic transducers are perpendicular to each other.
Further, the application method of the pipeline bubble size measurement system based on the time difference type ultrasonic flowmeter comprises the following steps:
step one, starting an ultrasonic flowmeter to measure v method, wherein the enabling signal is at high level, and measuring the flow velocity v in the pipeline through an ultrasonic transducer of the v method Flow of Record the time T of the ultrasonic wave traveling in the positive direction up And the time T of the ultrasonic wave in the reverse direction down The method comprises the steps of carrying out a first treatment on the surface of the Flow velocity v in the pipeline Flow of The calculation formula is that,
step two, when the bubbles in the pipeline move to the ultrasonic wave propagation path, the instrument cannot measure the flow velocity in the pipeline, and the flow velocity is recorded as t 11 Simultaneously, the enabling signal is changed into low level, the ultrasonic flowmeter is converted into a z method for measurement, and at the moment, the z method can still measure the flow rate;
step three, when the bubble moves to the ultrasonic wave propagation path measured by the z method, the bubble cannot measure the flow velocity, and the flow velocity is recorded as t 12 The method comprises the steps of carrying out a first treatment on the surface of the At this time, the measurement mode is not converted, and the enable signal is kept at a low level;
step four, keeping the z-method measurement until the flow velocity can be measured, and recording the flow velocity as t 13 The method comprises the steps of carrying out a first treatment on the surface of the Meanwhile, the enabling signal is changed into high level to be converted into v method for measurement, at the moment, the v method still cannot measure the flow velocity, and bubbles continue to flow along with the medium; step five, until the flow rate can be measured by the v method, recording the flow rate as t 14 To complete the measurement of the data; when two sets of ultrasonic transducers are provided, the second set of measured data is recorded as t 21 ，t 22 ，t 23 ，t 24 ；
And step six, transmitting flow velocity data in the pipeline to a data processing unit, obtaining flow velocity measured by the ultrasonic flowmeter at different moments, obtaining numerical values of all time nodes through the data processing unit, and calculating the size of the bubbles according to the data.
Further, the sixth step includes the following steps:
1) Calculating the length and width of the bubble by measuring the obtained parameters, wherein the inner diameter of the detected pipeline is recorded as D, and the included angles between the ultrasonic wave propagation and the flow velocity by the v method and the z method are respectively theta v And theta z The method comprises the steps of carrying out a first treatment on the surface of the The calculation formula of the length of the bubble is,
2) The calculation formula of the width of the air bubble is as follows,
3) The size of the bubbles is finally calculated through the width and the length,
V＝π*R 2 *L。
the beneficial effects of the invention are as follows:
the invention skillfully utilizes the principle that the flow rate cannot be obtained by the flowmeter when bubbles exist on the ultrasonic wave propagation path, and solves the problem that the size of the bubbles cannot be measured by simultaneously using the v method and the z method to install the ultrasonic transducer and calculating the size of the bubbles by utilizing the spatial relation of ultrasonic wave propagation; the error of measurement can be reduced by the installation of two groups of ultrasonic transducers; the on-demand switching of v-method and z-method measurement is realized by the application of an excitation pulse module, an enabling control module, a receiving and transmitting time sequence control module, a DSP control module and the like.
Drawings
Fig. 1 is a schematic structural diagram of a system for measuring the size of bubbles in a pipeline based on a time difference type ultrasonic flowmeter;
fig. 2 is a schematic diagram of a Z-method installation structure of a time difference type ultrasonic flowmeter based on a pipeline bubble size measurement system of the time difference type ultrasonic flowmeter;
FIG. 3 is a schematic view of a V-method installation structure of a time difference type ultrasonic flowmeter based on a pipeline bubble size measurement system of the time difference type ultrasonic flowmeter;
FIG. 4 is a schematic diagram of a combination of Z-method and V-method installation of a pipeline bubble size measurement system based on a time difference type ultrasonic flowmeter according to the present invention;
FIG. 5 is a schematic diagram of a combined installation structure of two groups of Z-method and V-method of a pipeline bubble size measurement system based on a time difference type ultrasonic flowmeter;
fig. 6 is a circuit connection diagram of a data acquisition unit of a pipeline bubble size measurement system based on a time difference type ultrasonic flowmeter;
fig. 7 is a flowchart of a measurement step of a system for measuring the size of bubbles in a pipeline based on a time difference type ultrasonic flowmeter according to the present invention.
Reference numerals: 1. the system comprises a data acquisition unit, a data processing unit, a 3.RS485 bus, a 4-ultrasonic transducer, a 41-first upstream ultrasonic transducer, a 42-second upstream ultrasonic transducer, a 43-first downstream ultrasonic transducer, a 411-third upstream ultrasonic transducer, a 421-fourth upstream ultrasonic transducer, a 431-second downstream ultrasonic transducer.
Detailed Description
The invention will now be described in further detail with reference to the accompanying drawings.
As shown in fig. 1 and fig. 4, the system for measuring the size of bubbles in a pipeline based on a time difference type ultrasonic flowmeter according to the embodiment of the invention is characterized in that: comprises a data acquisition unit 1 and a data processing unit 2; the data acquisition unit 1 comprises an ultrasonic flowmeter and a control unit, the ultrasonic flowmeter comprises a plurality of ultrasonic transducers 4, the ultrasonic transducers 4 comprise a first upstream ultrasonic transducer 41, a second upstream ultrasonic transducer 42 and a first downstream ultrasonic transducer 43, the first upstream ultrasonic transducer 41 and the first downstream ultrasonic transducer 43 are arranged on a pipeline through a v method, and the second upstream ultrasonic transducer 42 and the first upstream ultrasonic transducer 41 are symmetrically arranged opposite to the first upstream ultrasonic transducer 41 with respect to the pipeline and form a z method installation structure with the first downstream ultrasonic transducer 43; the first upstream ultrasonic transducer 41, the second upstream ultrasonic transducer 42 and the first downstream ultrasonic transducer 43 are respectively and electrically connected with a control unit, the control unit is electrically connected with the data processing unit 2, and the control unit is used for controlling the operation of the first upstream ultrasonic transducer 41, the second upstream ultrasonic transducer 42 and the first downstream ultrasonic transducer 43 and the switching of the transceiving modes, and transmitting the collected information to the data processing unit 2 for processing.
Therefore, the principle that the flow rate cannot be obtained by the flowmeter when the bubbles exist on the ultrasonic propagation path is skillfully utilized, the ultrasonic transducer 4 is installed by using the v method and the z method, and the size of the bubbles is calculated by utilizing the spatial relation of ultrasonic propagation of the ultrasonic transducer, so that the problem that the size of the bubbles cannot be measured is solved.
In this embodiment, as shown in fig. 6, the control unit includes a matching circuit, an enable control module, an excitation pulse module, a threshold detection module, a transceiver timing control module, a DSP control module, a high-precision timing module, a filtering amplification module, and a zero-crossing detection module; the first upstream ultrasonic transducer 41 is electrically connected with the enabling control module and the receiving and transmitting time sequence control module through a matching circuit, the second upstream ultrasonic transducer 42 is electrically connected with the enabling control module and the receiving and transmitting time sequence control module through a matching circuit, and the first downstream ultrasonic transducer 43 is electrically connected with the receiving and transmitting time sequence control module through a matching circuit; the DSP control module is used for controlling the excitation pulse module, transmitting data signals to the threshold detection module, carrying out data transmission with the high-precision timing module and carrying out data transmission with the data processing unit 2; the excitation pulse module is used for sending an enabling signal to the enabling control module and sending an excitation signal to the threshold detection module and the receiving and transmitting time sequence control module; the enabling control module is used for controlling the operation of the first upstream ultrasonic transducer 41 or the second upstream ultrasonic transducer 42; the receiving and transmitting time sequence control module is used for controlling the receiving and transmitting states of the first upstream ultrasonic transducer 41, the second upstream ultrasonic transducer 42 and the first downstream ultrasonic transducer 43 and transmitting the obtained signals to the filtering and amplifying module; the filtering and amplifying module is used for transmitting the signal which reaches the requirement of the measured amplitude through the filtering and amplifying module to the zero-crossing detection module; the zero-crossing detection module is used for transmitting the processed signal to the high-precision timing module; the threshold detection module is used for receiving the signal of the DSP control module, detecting the threshold of the excitation signal and transmitting the information to the high-precision timing module; the high-precision timing module is used for determining the transmitting time of the ultrasonic wave through the signal transmitted by the threshold detection module, and determining the receiving time of the ultrasonic wave through the signal transmitted by the zero-crossing detection module. The matching circuit is connected with an inductor in series and is used for realizing tuning. Thus, the functions of acquisition, caching, processing, data wireless communication and the like are completed through the cooperative work of the modules.
Wherein, the enabling signal sent by the enabling control module is used for selecting one of the ultrasonic transducers 4 connected with the enabling signal to work; the receiving and transmitting time sequence control module sends out signals for selecting the upstream and downstream ultrasonic transducers 4 as transmitting transducers, and the other ultrasonic transducer 4 as receiving transducer; the zero-crossing detection module is used for processing the distorted received signals and also obtaining ideal continuous high-level signals to determine the receiving time of the signals; a threshold detection module; processing the transmitting signal to obtain an ideal continuous high-level signal, and further determining the transmitting time of the ultrasonic signal; the high-precision timing module is used for precisely measuring the time from the transmission to the reception of the signal and transmitting the time to the DSP control module for calculating the time difference and other information; the DSP control module calculates the flow rate in real time through the data of the high-precision timing module.
When the ultrasonic transducer is used, the DSP control module can control the excitation pulse module to send an enabling signal to the enabling control module when the flow speed changes to zero, and the enabling control module controls one ultrasonic transducer 4 connected with the exciting pulse module to enable the exciting pulse module, so that conversion between the v method and the z method of the ultrasonic transducer is realized.
Wherein, the DSP control module adopts TMS320F28335 chip.
The excitation pulse module consists of an AD9102 pulse signal generator.
The enabling control module consists of two AD7501 multi-way switch chips.
The receiving and transmitting time sequence control module consists of two AD7501 multipath switch chips.
The filter amplification module adopts an LTC6226 operational amplifier.
Wherein, zero crossing detection module comprises LM324 comparator.
Wherein, the threshold detection module comprises AD790 comparator.
Wherein, the high-precision timing module is controlled by an MS1022P chip.
In this embodiment, the data processing unit 2 adopts an upper computer developed based on a LabView platform. The operation interface of the upper computer comprises operation buttons for receiving data, calculating data, storing data, retrieving data and the like, and display controls for displaying oscillograms and the like; the upper computer is used for displaying flow velocity diagrams at different moments in the pipeline through data received by the ultrasonic flowmeter after being installed by combining a z method and a v method; acquiring each moment of abnormal flow velocity based on the flow velocity graph, calculating the length and width of the air bubbles through corresponding formulas, and then calculating the size of the air bubbles; and storing, calling and archiving the obtained data. The upper computer and the DSP control module can be connected through an RS485 bus 3.
Specifically, the DSP control module may control the transceiving sequence of the ultrasonic transducer 4 and the enabling of the ultrasonic transducer 4 located upstream when opened, so that the transceiving functions of the ultrasonic transducer 4 located upstream and the ultrasonic transducer 4 located downstream are alternately performed, and the enabling of the ultrasonic transducer 4 located upstream may enable the ultrasonic transducer 4 to be converted between the v-method and the z-method. Generating two square wave pulse signals, wherein the first excitation signal is controlled by a receiving and transmitting time sequence module, and exciting an upstream ultrasonic transducer 4 in a group of ultrasonic transducers 4 at a high level, such as a first upstream ultrasonic transducer 41 or a second upstream ultrasonic transducer 42, so that the upstream ultrasonic transducer 4 in the group becomes a transmitting transducer, and the other downstream ultrasonic transducer 4 is a receiving transducer, such as a first downstream ultrasonic transducer 43; at low level the downstream ultrasound transducer 4 is excited to become a transmitting transducer, such as the first downstream ultrasound transducer 43, and the upstream ultrasound transducer 4 becomes a receiving transducer, such as the first upstream ultrasound transducer 41 or the second upstream ultrasound transducer 42; therefore, the alternation of the forward and backward propagation of the ultrasonic signals can be controlled, and further the measurement of the forward and backward propagation time difference of the ultrasonic signals is realized. The second enable signal is used to enable the upstream ultrasonic transducer 4, such as selecting the first upstream ultrasonic transducer 41 at a high level, and enabling the second upstream ultrasonic transducer 42 at a low level, to control its switching between v-method and z-method, controlled by the enable control module. If a plurality of groups of ultrasonic transducers 4 exist, the control is performed according to the rule.
When the transmitting transducer is excited by the excitation signal, the transmitting transducer emits an acoustic wave signal, and the waveform of the excitation signal is influenced to a certain extent at the same time, and the excitation signal is synchronous with the transmitting time of the ultrasonic wave signal at the moment, so that the transmitting time of the acoustic wave signal can be determined by processing the excitation signal emitted by the transmitting transducer as the transmitting signal. The transmitting signal is processed by the threshold detection module, so that the transmitting time of the ultrasonic signal can be determined, and the high-precision timing module records the transmitting time of the ultrasonic signal.
When the receiving transducer receives the ultrasonic signal sent by the transmitting transducer, a response electric signal is generated, the electric signal is called a receiving signal, the electric signal is filtered and amplified, so that the signal is stable, the amplitude meets the measurement requirement, then the moment of the receiving transducer receiving the signal is determined after being processed by the zero-detection module, and meanwhile, the moment is recorded by the high-precision timing module, so that the receiving moment of the signal is obtained.
As shown in fig. 5, in the present embodiment, two groups of ultrasonic transducers 4 are provided, one group of ultrasonic transducers 4 includes a first upstream ultrasonic transducer 41, a second upstream ultrasonic transducer 42 and a first downstream ultrasonic transducer 43, and the other group of ultrasonic transducers 4 includes a third upstream ultrasonic transducer 411, a fourth upstream ultrasonic transducer 421 and a second downstream ultrasonic transducer 431, the third upstream ultrasonic transducer 411 and the second downstream ultrasonic transducer 431 are mounted on a pipe by a v-method, and the fourth upstream ultrasonic transducer 421 and the third upstream ultrasonic transducer 411 are symmetrically mounted on the opposite side of the third upstream ultrasonic transducer 411 with respect to the pipe and form a z-method mounting structure with the second downstream ultrasonic transducer 431. Thus, errors in measurement are reduced.
Wherein the detection surfaces of the two groups of ultrasonic transducers 4 are mutually perpendicular. Thereby, the accuracy of the measurement is further increased.
As shown in fig. 7, a method for using the above-mentioned pipeline bubble size measurement system based on the time difference type ultrasonic flowmeter is characterized by comprising the following steps:
step one, an ultrasonic flowmeter is started to measure v method, at the moment, an enabling signal is at a high level, and the ultrasonic transducer 4 of the v method is used for measuring the flow velocity v in the pipeline Flow of Record the time T of the ultrasonic wave traveling in the positive direction up And the time T of the ultrasonic wave in the reverse direction down The method comprises the steps of carrying out a first treatment on the surface of the Flow velocity v in the pipeline Flow of The calculation formula is that,
wherein T is obtained by subtracting the transmitting time from the receiving time when the ultrasonic wave propagates in the positive direction up The method comprises the steps of carrying out a first treatment on the surface of the When the ultrasonic wave propagates in the reverse direction, T can be obtained by subtracting the transmitting time from the receiving time down 。
Step two, when the bubbles in the pipeline move to the ultrasonic wave propagation path, the instrument cannot measure the flow velocity in the pipeline, and the flow velocity is recorded as t 11 Simultaneously, the enabling signal is changed into low level, the ultrasonic flowmeter is converted into a z method for measurement, and at the moment, the z method can still measure the flow rate;
step three, when the bubble moves to the ultrasonic wave propagation path measured by the z method, the bubble cannot measure the flow velocity, and the flow velocity is recorded as t 12 The method comprises the steps of carrying out a first treatment on the surface of the At this timeThe measurement mode is not converted, and the enable signal is kept at a low level;
step four, keeping the z-method measurement until the flow velocity can be measured, and recording the flow velocity as t 13 The method comprises the steps of carrying out a first treatment on the surface of the Meanwhile, the enabling signal is changed into high level to be converted into v method for measurement, at the moment, the v method still cannot measure the flow velocity, and bubbles continue to flow along with the medium; step five, until the flow rate can be measured by the v method, recording the flow rate as t 14 To complete the measurement of the data; when two sets of ultrasonic transducers 4 are provided, the second set of measured data is denoted as t 21 ，t 22 ，t 23 ，t 24 ；
And step six, the flow velocity data in the pipeline are transmitted to the data processing unit 2, so that the flow velocity measured by the ultrasonic flowmeter at different moments can be obtained, the data of each time node can be obtained through the data processing unit 2, and the size of the air bubble is calculated according to the data.
The sixth step comprises the following steps:
1) Calculating the length and width of the bubble by measuring the obtained parameters, wherein the inner diameter of the detected pipeline is recorded as D, and the included angles between the ultrasonic wave propagation and the flow velocity by the v method and the z method are respectively theta v And theta z The method comprises the steps of carrying out a first treatment on the surface of the The calculation formula of the length of the bubble is,
2) The calculation formula of the width of the air bubble is as follows,
3) The size of the bubbles is finally calculated through the width and the length,
V＝π*R 2 *L。
the above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above examples, and all technical solutions belonging to the concept of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to the invention without departing from the principles thereof are intended to be within the scope of the invention as set forth in the following claims.
Claims (10)
1. Pipeline bubble size measurement system based on time difference formula ultrasonic flowmeter, its characterized in that: comprises a data acquisition unit (1) and a data processing unit (2); the data acquisition unit (1) comprises an ultrasonic flowmeter and a control unit, the ultrasonic flowmeter comprises a plurality of ultrasonic transducers (4), the ultrasonic transducers (4) comprise a first upstream ultrasonic transducer (41), a second upstream ultrasonic transducer (42) and a first downstream ultrasonic transducer (43), the first upstream ultrasonic transducer (41) and the first downstream ultrasonic transducer (43) are arranged on a pipeline through a v method, and the second upstream ultrasonic transducer (42) and the first upstream ultrasonic transducer (41) are symmetrically arranged opposite to the first upstream ultrasonic transducer (41) with respect to the pipeline and form a z-method installation structure with the first downstream ultrasonic transducer (43); the first upstream ultrasonic transducer (41), the second upstream ultrasonic transducer (42) and the first downstream ultrasonic transducer (43) are respectively and electrically connected with a control unit, and the control unit is electrically connected with the data processing unit (2).
2. The time difference ultrasonic flow meter based conduit bubble size measurement system of claim 1, wherein: the control unit comprises a matching circuit, an enabling control module, an excitation pulse module, a threshold detection module, a receiving and transmitting time sequence control module, a DSP control module, a high-precision timing module, a filtering and amplifying module and a zero crossing detection module; the first upstream ultrasonic transducer (41) is respectively and electrically connected with the enabling control module and the receiving and transmitting time sequence control module through a matching circuit, the second upstream ultrasonic transducer (42) is respectively and electrically connected with the enabling control module and the receiving and transmitting time sequence control module through a matching circuit, and the first downstream ultrasonic transducer (43) is electrically connected with the receiving and transmitting time sequence control module through a matching circuit; the DSP control module is used for controlling the excitation pulse module, transmitting data signals to the threshold detection module, carrying out data transmission with the high-precision timing module and carrying out data transmission with the data processing unit (2); the excitation pulse module is used for sending an enabling signal to the enabling control module and sending an excitation signal to the threshold detection module and the receiving and transmitting time sequence control module; the enabling control module is used for controlling the operation of the first upstream ultrasonic transducer (41) or the second upstream ultrasonic transducer (42); the receiving and transmitting time sequence control module is used for controlling receiving and transmitting states of the first upstream ultrasonic transducer (41), the second upstream ultrasonic transducer (42) and the first downstream ultrasonic transducer (43) and transmitting obtained signals to the filtering and amplifying module; the filtering and amplifying module is used for transmitting the signal which reaches the requirement of the measured amplitude through the filtering and amplifying module to the zero-crossing detection module; the zero-crossing detection module is used for transmitting the processed signal to the high-precision timing module; the threshold detection module is used for receiving the signal of the DSP control module, detecting the threshold of the excitation signal and transmitting the information to the high-precision timing module; the high-precision timing module is used for determining the transmitting time of the ultrasonic wave through the signal transmitted by the threshold detection module, and determining the receiving time of the ultrasonic wave through the signal transmitted by the zero-crossing detection module.
3. The time difference ultrasonic flow meter based conduit bubble size measurement system of claim 2, wherein: the DSP control module adopts a TMS320F28335 chip.
4. The time difference ultrasonic flow meter based conduit bubble size measurement system of claim 2, wherein: the receiving and transmitting time sequence control module consists of two AD7501 multipath switch chips.
5. The time difference ultrasonic flow meter based conduit bubble size measurement system of claim 2, wherein: the high precision timing module is controlled by the MS1022P chip.
6. The time difference ultrasonic flow meter based conduit bubble size measurement system of claim 1, wherein: the data processing unit (2) adopts an upper computer developed based on a LabView platform.
7. The time difference ultrasonic flow meter based conduit bubble size measurement system of claim 1, wherein: the ultrasonic transducers (4) are provided with two groups, one group of ultrasonic transducers (4) comprises a first upstream ultrasonic transducer (41), a second upstream ultrasonic transducer (42) and a first downstream ultrasonic transducer (43), the other group of ultrasonic transducers (4) comprises a third upstream ultrasonic transducer (411), a fourth upstream ultrasonic transducer (421) and a second downstream ultrasonic transducer (431), the third upstream ultrasonic transducer (411) and the second downstream ultrasonic transducer (431) are installed on a pipeline through a v method, and the fourth upstream ultrasonic transducer (421) and the third upstream ultrasonic transducer (411) are symmetrically installed on the opposite surface of the third upstream ultrasonic transducer (411) with respect to the pipeline and form a z-method installation structure with the second downstream ultrasonic transducer (431).
8. The transit time ultrasonic flow meter based conduit bubble size measurement system of claim 7, wherein: the detection surfaces of the two groups of ultrasonic transducers (4) are mutually perpendicular.
9. A method of using a transit time ultrasonic flow meter based conduit bubble size measurement system as claimed in any one of the preceding claims, comprising the steps of:
step one, starting an ultrasonic flowmeter to measure v method, wherein the enabling signal is at high level, and measuring the flow velocity v in the pipeline through an ultrasonic transducer (4) of the v method Flow of Record the time T of the ultrasonic wave traveling in the positive direction up And the time T of the ultrasonic wave in the reverse direction down The method comprises the steps of carrying out a first treatment on the surface of the Flow velocity v in the pipeline Flow of The calculation formula is that,
step two, when the bubbles in the pipeline move to the ultrasonic wave propagation path, the instrument cannot measure the flow velocity in the pipeline, and the flow velocity is recorded as t 11 Simultaneously, the enabling signal is changed into low level, the ultrasonic flowmeter is converted into a z method for measurement, and at the moment, the z method can still measure the flow rate;
step three, when the bubble moves to the ultrasonic wave propagation path measured by the z method, the bubble cannot measure the flow velocity, and the flow velocity is recorded as t 12 The method comprises the steps of carrying out a first treatment on the surface of the At this time, the measurement mode is not converted, and the enable signal is kept at a low level;
step four, keeping the z-method measurement until the flow velocity can be measured, and recording the flow velocity as t 13 The method comprises the steps of carrying out a first treatment on the surface of the Meanwhile, the enabling signal is changed into high level to be converted into v method for measurement, at the moment, the v method still cannot measure the flow velocity, and bubbles continue to flow along with the medium;
step five, until the flow rate can be measured by the v method, recording the flow rate as t 14 To complete the measurement of the data;
and step six, transmitting flow velocity data in the pipeline to a data processing unit (2), obtaining flow velocity measured by the ultrasonic flowmeter at different moments, obtaining numerical values of all time nodes through the data processing unit (2), and calculating the size of the bubbles according to the data.
10. A method of use according to claim 9, wherein said step six comprises the steps of:
1) Calculating the length and width of the bubble by measuring the obtained parameters, wherein the inner diameter of the detected pipeline is recorded as D, and the included angles between the ultrasonic wave propagation and the flow velocity by the v method and the z method are respectively theta v And theta z I is the number of groups of ultrasonic transducers (4); the calculation formula of the length of the bubble is,
2) The calculation formula of the width of the air bubble is as follows,
3) The size of the bubbles is finally calculated through the width and the length,
V＝π*R 2 *L。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310094241.6A CN116295149A (en) | 2023-02-10 | 2023-02-10 | Pipeline bubble size measurement system based on time difference type ultrasonic flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310094241.6A CN116295149A (en) | 2023-02-10 | 2023-02-10 | Pipeline bubble size measurement system based on time difference type ultrasonic flowmeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116295149A true CN116295149A (en) | 2023-06-23 |
Family
ID=86817733
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310094241.6A Pending CN116295149A (en) | 2023-02-10 | 2023-02-10 | Pipeline bubble size measurement system based on time difference type ultrasonic flowmeter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116295149A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116879389A (en) * | 2023-09-07 | 2023-10-13 | 北京普能世纪科技有限公司 | Bubble detection device, detection method, detection system and storage medium of flow battery |
-
2023
- 2023-02-10 CN CN202310094241.6A patent/CN116295149A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116879389A (en) * | 2023-09-07 | 2023-10-13 | 北京普能世纪科技有限公司 | Bubble detection device, detection method, detection system and storage medium of flow battery |
| CN116879389B (en) * | 2023-09-07 | 2024-03-22 | 北京普能世纪科技有限公司 | Bubble detection device, detection method, detection system and storage medium of flow battery |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN206930321U (en) | Non-full pipe ultrasonic flowmeter | |
| CN103868555A (en) | Circulatory time difference detection method for ultrasonic flow meter | |
| CN101162164A (en) | Frequency modulation wave marking method for time-difference process ultrasonic flowmeter | |
| CN114088151B (en) | External clamping type multichannel ultrasonic flow detection device and detection method | |
| CN103090916A (en) | Ultrasonic flow measurement device and ultrasonic flow measurement method | |
| CN103630174A (en) | Flow measuring method of ultrasonic flow meter | |
| CN114001804B (en) | Calibration method and system of ultrasonic metering device based on time difference method | |
| CN105333911A (en) | Low-power-consumption middle-low-pressure gas ultrasonic flow measuring circuit | |
| CN111157065A (en) | Acoustic time delay measuring method in ultrasonic signal transmission loop of gas ultrasonic flowmeter | |
| CN101793908A (en) | Ultrasonic flue gas flow rate meter | |
| CN201247251Y (en) | Measurement gauge for pipe gas flow rate and sonic velocity | |
| CN116295149A (en) | Pipeline bubble size measurement system based on time difference type ultrasonic flowmeter | |
| CN102102511B (en) | Underground ultrasonic Doppler flow measurement device and measurement method | |
| CN214583449U (en) | High-precision wide-range ultrasonic flow measuring device | |
| CN102288265B (en) | Time difference detecting device of dual-channel ultrasonic flow meter | |
| CN102095889B (en) | Three-channel ultrasonic time difference method for measuring flow velocity | |
| CN203069223U (en) | Synchronous phase code time difference detection device for ultrasonic flowmeter | |
| CN104596601A (en) | Ultrasonic flow meter sensor with eight sound channels | |
| CN112903043B (en) | Multichannel ultrasonic flowmeter system | |
| CN104236647A (en) | Ultrasonic flowmeter based on single-chip microcomputer | |
| CN202216742U (en) | Time difference detection device of ultrasonic flowmeter by double-channel method | |
| CN104964718A (en) | Small flow ultrasonic flow system and measuring method | |
| CN102023038A (en) | Ultrasonic measurement method for pipeline flux | |
| CN112747260B (en) | Ultrasonic flow measuring device capable of preventing noise interference | |
| CN211783654U (en) | Low-cost wireless ultrasonic time difference method flow measurement equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |