CN107727176A - A kind of ultrasonic gas flowmeter and its flow-measuring method - Google Patents
A kind of ultrasonic gas flowmeter and its flow-measuring method Download PDFInfo
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- CN107727176A CN107727176A CN201710976469.2A CN201710976469A CN107727176A CN 107727176 A CN107727176 A CN 107727176A CN 201710976469 A CN201710976469 A CN 201710976469A CN 107727176 A CN107727176 A CN 107727176A
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000005259 measurement Methods 0.000 claims abstract description 30
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 5
- 238000004891 communication Methods 0.000 claims abstract description 4
- 239000012530 fluid Substances 0.000 claims description 13
- 230000003321 amplification Effects 0.000 claims description 4
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 4
- 230000000977 initiatory effect Effects 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 238000003672 processing method Methods 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims 1
- 239000007789 gas Substances 0.000 abstract description 28
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 10
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 239000003345 natural gas Substances 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
Classifications
-
- 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
- G01F1/662—Constructional details
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- Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
- Electromagnetism (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
Abstract
The invention discloses a kind of ultrasonic gas flowmeter and its flow-measuring method, the flowmeter includes fluid-transporting tubing and downbeam ultrasonic transducer sends signal end, and downbeam ultrasonic transducer reception signal end, countercurrent direction ultrasonic transducer send signal end and countercurrent direction ultrasonic transducer reception signal end；Also include MCU chip, MCU chip connection power supply, user key-press setup module, temperature compensation module, pressure compensation module, liquid crystal display, serial ports and wireless communication module and pulse output and standard 4~20mA output modules.The ultrasonic gas flowmeter anti-noise jamming ability of the present invention is strong, can reduce measurement error, has the characteristics of measurement accuracy height and excellent stability, in the production process of gas field, natural gas volume flow can be measured reliably, stably, exactly.
Description
Technical field
The invention belongs to technical field of ultrasonic measurement, is related to ultrasonic measurement equipment, especially a kind of ultrasonic gas
Flowmeter and its flow-measuring method.
Background technology
Natural gas belongs to non-renewable energy resources, in natural gas energy resource industry, the high-acruracy survey of volume flow, to saving
The energy, safety in production, it is very important to reduce cost, and ultrasonic gas flowmeter has non-contact measurement, measurement because of it
Precision is high, measurement range is wide and installation, using, it is easy to maintenance the advantages that be widely used in the production scene of gas field.
Generally, in the production of gas field, detected fluid is extremely complex, is the mixing of multifrequency nature material, utilizes ultrasonic gas
Flow progress high-acruracy survey of the flowmeter to complex fluid is particularly important, and the key technology of ultrasonic gas flowmeter is ultrasound
The performance of wave transducer, faint and noisy ultrasonic echo signal conditioning and ultrasonic echo signal arrival time are really
It is fixed, it is to ensure that ultrasonic gas flowmeter can be measured accurately for the design of ultrasonic gas flowmeter, in terms of above three
Key.
At present, domestic ultrasonic flowmeter product is more, and cost is relatively low, but overall measurement performance is not high, external
Ultrasonic flowmeter is relatively good in precision, performance etc., but expensive, limits its substantial amounts of application in the industry.
Therefore, a kind of stabilization and the high ultrasonic gas flowmeter of precision are designed, there is important actual application value.
The content of the invention
The shortcomings that it is an object of the invention to overcome above-mentioned prior art, there is provided a kind of ultrasonic gas flowmeter and its stream
Measuring method, it can reduce measurement error, have the characteristics of measurement accuracy height and excellent stability, in gas field production process
In, natural gas volume flow can be measured reliably, stably, exactly.
The purpose of the present invention is achieved through the following technical solutions：
Present invention firstly provides a kind of ultrasonic gas flowmeter, including fluid-transporting tubing and on pipeline
Flange, downbeam ultrasonic transducer send signal end, and downbeam ultrasonic transducer reception signal end, countercurrent direction surpass
Acoustic wave transducer sends signal end and countercurrent direction ultrasonic transducer reception signal end；Also include MCU chip, the MCU
Chip is connected with power supply, user key-press setup module, temperature compensation module, pressure compensation module, liquid crystal display, serial ports and wireless
Communication module and the pulse output to marked fluid integrated flow and standard 4~20mA output modules；The downbeam
Ultrasonic transducer reception signal end and countercurrent direction ultrasonic transducer reception signal end pass through fine adjustable automatic increasing respectively
Beneficial amplifying circuit is connected with MCU chip；The power supply is additionally coupled to fine adjustable automatic gain amplifying circuit.
Further, above-mentioned downbeam ultrasonic transducer sends signal end, downbeam ultrasonic transducer receives letter
Number end, countercurrent direction ultrasonic transducer send signal end and countercurrent direction ultrasonic transducer reception signal end in x types point
Cloth is installed, and the axis of each signal end is respectively 45 ° with the axis angle of fluid-transporting tubing.
Further, above-mentioned fine adjustable automatic gain amplifying circuit is divided into three-level：The first order is to Weak Ultrasonic ripple echo
Signal amplitude carries out the programming amplifying of coarse adjustment, and second and third grade is to realize the DAC amplifying circuits fine-tuned to gain,
By multiplication factor of the pid control algorithm adjust automatically per one-level amplifying circuit, make echo-signal amplitude be at it is set
In fixed amplitude range.
Further, the model STM320F446 of above-mentioned MCU chip.
Further, said temperature compensating module and pressure compensation module are when calibrating ultrasonic gas flowmeter, by adopting
Collect real-time temperature and pressure to compensate flow measurement.
The present invention also proposes a kind of flow-measuring method based on above-mentioned ultrasonic gas flowmeter：Using in MCU chip
Two-way of the ADC collection in portion after amplification is suitable, countercurrent direction ultrasonic echo signal, is surveyed using ultrasonic propagation time
Quantity algorithm, ultrasonic echo signal arrival time is judged, determine the time that two-way echo-signal reaches；Using suitable, inverse
The difference for flowing transit-time of ultrasonic calculates the flow velocity of fluid, and then obtains the volume flow of fluid.
Further, in above-described flow-measuring method：The ultrasonic propagation time Measurement Algorithm is specially：
With downbeam ultrasonic echo signal propagation time t1Measurement illustrate：By the downbeam collected from
It is X to dissipate ultrasonic echo signal1(k), first, initiation parameter, threshold value T, window width WID, data length n；Then, from k
=0 proceeds by search, works as X1(k) during ＞ T, the maximum of points of echo-signal is searched in k to k+WID window ranges, and
The time of maximum of points is write down, this is the first effective extreme point of ultrasonic echo signal searched, is carried out according to the method
Search, when as k ＞ n-WID-1, stops search, and obtains all effective extreme points of echo-signal, chooses the 3rd effectively
Extreme point p1Corresponding time t1As downbeam ultrasonic propagation time, t1=p1×Ts, wherein, TsFor the sampling time；
Processing to countercurrent direction ultrasonic echo signal is identical with the downbeam ultrasonic signal processing method.
The present invention compared with prior art, has the advantages that：
(1) fine adjustable digital automatic gain control circuit is devised in ultrasonic gas flowmeter of the invention, can
Fine adjustment automatically is carried out to the multiplication factor of ultrasonic echo signal, the amplitude of echo-signal is in the scope of setting
It is interior, avoid multiplication factor too small, cause signal characteristic unobvious, or multiplication factor is excessive, causes distorted signals, signal characteristic
Information is lost；
(2) present invention can accurately determine the Measurement Algorithm of ultrasonic echo signal arrival time, and this method can be accurate
Measure the time difference of suitable countercurrent direction ultrasonic propagation, and stability is high, influenceed by noise jamming small, can significantly carry
The precision and stability of praetersonic gas flowmeter measurement.
Brief description of the drawings
Fig. 1 is the ultrasonic gas flowmeter block diagram of the present invention；
Fig. 2 is the structural representation of fine adjustable digital automatic gain control circuit 7 in the present invention；
Fig. 3 is the flow chart of ultrasonic propagation time Measurement Algorithm in the present invention.
Wherein：1 is fluid-transporting tubing, and 2 be flange, and 3 be that downbeam ultrasonic transducer sends signal end, and 4 be suitable
Direction ultrasonic transducer reception signal end is flowed, 5 be that countercurrent direction ultrasonic transducer sends signal end, and 6 surpass for countercurrent direction
Acoustic wave transducer reception signal end, 7 be fine adjustable automatic gain amplifying circuit, and 8 be power supply, and 9 be MCU chip, and 10 be user
Button setup module, 11 be temperature compensation module, and 12 be pressure compensation module, and 13 be liquid crystal display, and 14 be serial ports and channel radio
Believe module, 15 be pulse output and standard 4~20mA output modules.
Embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings：
Referring to Fig. 1：Present invention firstly provides a kind of ultrasonic gas flowmeter, including fluid-transporting tubing 1 and installation
Flange 2, downbeam ultrasonic transducer on pipeline 1 send signal end 3, downbeam ultrasonic transducer reception signal
End 4, countercurrent direction ultrasonic transducer send signal end 5 and countercurrent direction ultrasonic transducer reception signal end 6；Also include
MCU chip 9, the MCU chip 9 are connected with power supply 8, user key-press setup module 10, temperature compensation module 11, pressure compensation mould
Block 12, liquid crystal display 13, serial ports and wireless communication module 14 and the pulse output to marked fluid integrated flow and standard 4
~20mA output modules 15.Downbeam ultrasonic transducer reception signal end 4 and countercurrent direction ultrasonic transducer receive letter
Number end 6 is connected by fine adjustable automatic gain amplifying circuit 7 with MCU chip 9 respectively；Power supply 8 be additionally coupled to it is fine it is adjustable from
Dynamic gain amplifying circuit 7.Power supply 8 provides electric energy for whole device.The pulse output of the present invention and 4~20mA of standard outputs are to use
Carry out marked fluid integrated flow.
The suitable of the present invention, countercurrent direction ultrasonic transducer send signal end 3,5, suitable, countercurrent direction ultrasonic transducer
Reception signal end 4,6 is mounted on the measurement pipeline between two flanges 2, and the measurement pipeline is closely sleeved on fluid delivery tube
On the outer wall in road 1.
The downbeam ultrasonic transducer of the present invention sends signal end 3, downbeam ultrasonic transducer reception signal
End 4, countercurrent direction ultrasonic transducer send signal end 5 and countercurrent direction ultrasonic transducer reception signal end 6 in x types point
Cloth is installed, and the axis of each signal end is respectively 45 ° with the axis angle of fluid-transporting tubing 1.
In highly preferred embodiment of the present invention, the model STM320F446 of MCU chip 9.Temperature compensation module 11 and pressure
Force compensating module 12 is mended when calibrating ultrasonic gas flowmeter by gathering real-time temperature and pressure to flow measurement
Repay.
The fine adjustable automatic gain amplifying circuit 7 of the present invention divides for three-level：The first order is that Weak Ultrasonic ripple echo is believed
Number amplitude carries out the programming amplifying of coarse adjustment, and second and third grade is to realize the DAC amplifying circuits fine-tuned to gain, is led to
Cross multiplication factor of the pid control algorithm adjust automatically per one-level amplifying circuit, make echo-signal amplitude be at it is set
Amplitude range in.As shown in Figure 2：First order programmable amplifying circuit connects second level DAC amplifying circuits by bandpass filtering, the
Two level DAC amplifying circuits connect third level DAC amplifying circuits, and third level DAC amplifying circuits are adopted by connecting ADC after LPF
Collect module, ADC acquisition modules are connected to MCU.Also, MCU is respectively connecting to first order programmable amplifying circuit, second level DAC is put
The control terminal of big circuit and third level DAC amplifying circuits.Ultrasonic echo signal inputs defeated to first order programmable amplifying circuit
Enter end.Signal of the ultrasonic echo signal from suitable countercurrent direction ultrasonic transducer reception signal end.
The present invention also proposes a kind of flow-measuring method based on above-mentioned ultrasonic gas flowmeter：
Gather that two-way after amplification is suitable, countercurrent direction ultrasonic echo letter using the ADC inside MCU chip 9
Number (suitable, countercurrent direction ultrasonic echo signal is to send signal end 3, downbeam by downbeam ultrasonic transducer to surpass
Acoustic wave transducer reception signal end 4, countercurrent direction ultrasonic transducer send signal end 5 and countercurrent direction ultrasonic transducer
Reception signal end 6 is obtained), using ultrasonic propagation time Measurement Algorithm, ultrasonic echo signal arrival time is carried out
Judge, determine the time that two-way echo-signal reaches；The stream of fluid is calculated using suitable, counter current ultrasonic wave signal propagation time difference
Speed, and then the volume flow of fluid is obtained, in the flow-measuring method of the present invention, temperature and pressure is for gas flow measurement
It is influential, when calibrating ultrasonic gas flowmeter, by temperature and pressure compensating module, gathers real-time temperature and pressure
Power compensates to flow measurement.
Wherein, in flow-measuring method of the invention, ultrasonic propagation time Measurement Algorithm is as shown in figure 3, the algorithm has
Body is：
With downbeam ultrasonic echo signal propagation time t1Measurement illustrate：By the downbeam collected from
It is X to dissipate ultrasonic echo signal1(k), first, initiation parameter, threshold value T, window width WID, data length n；Then, from k
=0 proceeds by search, works as X1(k) during ＞ T, the maximum of points of echo-signal is searched in k to k+WID window ranges, and
The time of maximum of points is write down, this is the first effective extreme point of ultrasonic echo signal searched, is carried out according to the method
Search, when as k ＞ n-WID-1, stops search, and obtains all effective extreme points of echo-signal, chooses the 3rd effectively
Extreme point p1Corresponding time t1As downbeam ultrasonic propagation time, t1=p1×Ts, wherein, TsFor the sampling time.
Processing to countercurrent direction ultrasonic echo signal is identical with the downbeam ultrasonic signal processing method.
In summary, ultrasonic gas flowmeter anti-noise jamming ability of the invention is strong, can reduce measurement error, tool
Have the characteristics of measurement accuracy is high and stability is excellent, in the production process of gas field, can reliably, stably, exactly to natural-gas
Product flow measures.
Claims (7)
1. a kind of ultrasonic gas flowmeter, it is characterised in that including fluid-transporting tubing (1) and on pipeline (1)
Flange (2), downbeam ultrasonic transducer send signal end (3), downbeam ultrasonic transducer reception signal end
(4), countercurrent direction ultrasonic transducer sends signal end (5) and countercurrent direction ultrasonic transducer reception signal end (6)；Also wrap
MCU chip (9) is included, the MCU chip (9) is connected with power supply (8), user key-press setup module (10), temperature compensation module
(11), pressure compensation module (12), liquid crystal display (13), serial ports and wireless communication module (14) and add up to marked fluid
The pulse output of flow and 4~20mA of standard output modules (15)；The downbeam ultrasonic transducer reception signal end (4)
Pass through fine adjustable automatic gain amplifying circuit (7) and MCU core respectively with countercurrent direction ultrasonic transducer reception signal end (6)
Piece (9) connects；The power supply (8) is additionally coupled to fine adjustable automatic gain amplifying circuit (7).
2. ultrasonic gas flowmeter according to claim 1, it is characterised in that the downbeam ultrasonic transducer
Send signal end (3), downbeam ultrasonic transducer reception signal end (4), countercurrent direction ultrasonic transducer transmission signal
End (5) and countercurrent direction ultrasonic transducer reception signal end (6) are in x type distributing installations, the axis of each signal end respectively with
The axis angle of fluid-transporting tubing (1) is 45 °.
3. ultrasonic gas flowmeter according to claim 1, it is characterised in that the fine adjustable automatic gain amplification
Circuit (7) is divided into three-level：The first order is that the programming amplifying of coarse adjustment is carried out to Weak Ultrasonic ripple echo-signal amplitude, second,
Three-level is to realize the DAC amplifying circuits fine-tuned to gain, by pid control algorithm adjust automatically per one-level amplifying circuit
Multiplication factor, the amplitude of echo-signal is in set amplitude range.
4. ultrasonic gas flowmeter according to claim 1, it is characterised in that the model of the MCU chip (9)
STM320F446。
5. ultrasonic gas flowmeter according to claim 1, it is characterised in that the temperature compensation module (11) and pressure
Force compensating module (12) is carried out when calibrating ultrasonic gas flowmeter by gathering real-time temperature and pressure to flow measurement
Compensation.
6. a kind of flow-measuring method based on ultrasonic gas flowmeter described in claim 3-5 any one, its feature exist
In, gather that the two-way after amplification is suitable, countercurrent direction ultrasonic echo signal using the internal ADC of MCU chip (9),
Using ultrasonic propagation time Measurement Algorithm, ultrasonic echo signal arrival time is judged, determines two-way echo-signal
The time of arrival；The flow velocity of fluid is calculated using suitable, counter current ultrasonic wave signal propagation time difference, and then obtains the volume of fluid
Flow.
7. flow-measuring method according to claim 6, it is characterised in that the ultrasonic propagation time Measurement Algorithm tool
Body is：
With downbeam ultrasonic echo signal propagation time t1Measurement illustrate：The downbeam collected is discrete super
Sound echo signal is X1(k), first, initiation parameter, threshold value T, window width WID, data length n；Then, opened from k=0
Beginning scans for, and works as X1(k) during ＞ T, the maximum of points of echo-signal is searched in k to k+WID window ranges, and is write down most
The time of big value point, this is the first effective extreme point of ultrasonic echo signal searched, is scanned for according to the method, directly
To as k ＞ n-WID-1, stop search, obtain all effective extreme points of echo-signal, choose the 3rd effective extreme point p1
Corresponding time t1As downbeam ultrasonic propagation time, t1=p1×Ts, wherein, TsFor the sampling time；
Processing to countercurrent direction ultrasonic echo signal is identical with the downbeam ultrasonic signal processing method.
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| CN201710976469.2A CN107727176B (en) | 2017-10-19 | 2017-10-19 | Ultrasonic gas flowmeter and flow measurement method thereof |
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| CN201710976469.2A CN107727176B (en) | 2017-10-19 | 2017-10-19 | Ultrasonic gas flowmeter and flow measurement method thereof |
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| CN107727176A true CN107727176A (en) | 2018-02-23 |
| CN107727176B CN107727176B (en) | 2023-12-26 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108534855A (en) * | 2018-05-11 | 2018-09-14 | 大连理工大学 | A kind of new type ultrasonic gas flowmeter and its measurement method |
| CN109323730A (en) * | 2018-11-20 | 2019-02-12 | 中环天仪股份有限公司 | Based on TDC-GP30 double-channel gas ultrasonic flowmeter and application method |
| CN112577558A (en) * | 2019-09-30 | 2021-03-30 | 新开普电子股份有限公司 | Ultrasonic flow metering system based on cloud edge adding calculation and edge equipment |
| CN113340363A (en) * | 2021-06-09 | 2021-09-03 | 河北大学 | High-precision wide-range ultrasonic flow measurement device and measurement method |
| CN113418572A (en) * | 2021-06-18 | 2021-09-21 | 重庆市山城燃气设备有限公司 | Signal authenticity detection system and method of flowmeter and gas metering equipment |
| CN113701835A (en) * | 2021-08-30 | 2021-11-26 | 安徽理工大学 | High-precision self-correcting ultrasonic coal bed gas extraction pipe network flowmeter |
| CN114993396A (en) * | 2022-07-14 | 2022-09-02 | 美核电气（济南）股份有限公司 | High-precision multichannel liquid ultrasonic flowmeter suitable for high-temperature medium |
| CN115096408A (en) * | 2022-05-10 | 2022-09-23 | 陕西航天动力高科技股份有限公司 | Automatic gain adjustment system and ultrasonic measurement and transducer health diagnosis method |
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| CN106840290A (en) * | 2017-01-10 | 2017-06-13 | 合肥工业大学 | A kind of high accuracy quadraphonic gas ultrasound wave current transmitter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108534855A (en) * | 2018-05-11 | 2018-09-14 | 大连理工大学 | A kind of new type ultrasonic gas flowmeter and its measurement method |
| CN109323730A (en) * | 2018-11-20 | 2019-02-12 | 中环天仪股份有限公司 | Based on TDC-GP30 double-channel gas ultrasonic flowmeter and application method |
| CN112577558A (en) * | 2019-09-30 | 2021-03-30 | 新开普电子股份有限公司 | Ultrasonic flow metering system based on cloud edge adding calculation and edge equipment |
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| CN113340363A (en) * | 2021-06-09 | 2021-09-03 | 河北大学 | High-precision wide-range ultrasonic flow measurement device and measurement method |
| CN113418572A (en) * | 2021-06-18 | 2021-09-21 | 重庆市山城燃气设备有限公司 | Signal authenticity detection system and method of flowmeter and gas metering equipment |
| CN113701835A (en) * | 2021-08-30 | 2021-11-26 | 安徽理工大学 | High-precision self-correcting ultrasonic coal bed gas extraction pipe network flowmeter |
| CN113701835B (en) * | 2021-08-30 | 2023-12-08 | 安徽理工大学 | High-precision self-correction ultrasonic coal bed gas extraction pipe network flowmeter |
| CN115096408A (en) * | 2022-05-10 | 2022-09-23 | 陕西航天动力高科技股份有限公司 | Automatic gain adjustment system and ultrasonic measurement and transducer health diagnosis method |
| CN114993396A (en) * | 2022-07-14 | 2022-09-02 | 美核电气（济南）股份有限公司 | High-precision multichannel liquid ultrasonic flowmeter suitable for high-temperature medium |
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| Publication number | Publication date |
|---|---|
| CN107727176B (en) | 2023-12-26 |
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