CN202229790U - Single track correlation method ultrasonic gas flow meter - Google Patents
Single track correlation method ultrasonic gas flow meter Download PDFInfo
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- CN202229790U CN202229790U CN2011203638389U CN201120363838U CN202229790U CN 202229790 U CN202229790 U CN 202229790U CN 2011203638389 U CN2011203638389 U CN 2011203638389U CN 201120363838 U CN201120363838 U CN 201120363838U CN 202229790 U CN202229790 U CN 202229790U
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Abstract
The utility model relates to a single track correlation method ultrasonic gas flow meter, which comprises a first transducer, a second transducer, a transducer installing pipeline, a switching circuit, a transmitting circuit, a receiving circuit and a control chip. The first transducer and the second transducer are arranged on the transducer installing pipeline and connected with the switching circuit, the input end of the transmitting circuit is connected with the control chip, the output end of the transmitting circuit is connected with the switching circuit, the input end of the receiving circuit is connected with the switching circuit, and the output end of the receiving circuit is connected with the control chip. Compared with the prior art, the single track correlation method ultrasonic gas flow meter enables the correlation method theory to be led in a time difference method flow meter, two signals performing related operation are two ultrasonic echo signals which are transmitted forward and backward, noise demodulation does not needed, and voltage comparison and other processes do not need, thereby greatly simplifying hardware, and overcoming development difficulties of the traditional time difference method and correlation method flow meters.
Description
Technical field
The utility model relates to a kind of gas meter, especially relates to a kind of monophony correlation method ultrasonic gas flowmeter.
Background technology
At present, ultrasonic flow meter commonly used comprises correlation method, time difference method flowmeter etc.Traditional correlation method flowmeter; Employing is arranged perpendicular to the parallel double sound channel of pipeline; The modulating action that utilizes the inner stochastic flow moving noise phenomenon that exists of measured fluid to produce sensor (transducer) extracts useful flowing noise signal; And the two-way noise signal carried out related operation, obtain the time interval of fluid, thereby obtain flowing information through two sensors.Actual two signals that carry out related operation are not the ultrasonic signal as carrier wave, but random noise signal needs exact solution to access noise signal, and faint noise signal is carried out a series of processing, and are very high to the requirement of hardware.And traditional time difference method flowmeter obtains flowing information at interval through measuring the travel-time of ultrasound wave between two sensors; The bottleneck that its precision improves is how to confirm that ultrasound wave arrives the moment point of receiving sensor; The general threshold voltage that adopts is confirmed; Also higher to hardware requirement, and receive the influence of fluid big.
The utility model content
The purpose of the utility model is exactly for the defective that overcomes above-mentioned prior art existence the monophony correlation method that a kind of hardware is simple, cost is low, precision is higher ultrasonic gas flowmeter to be provided.
The purpose of the utility model can realize through following technical scheme: a kind of monophony correlation method ultrasonic gas flowmeter; It is characterized in that; This gas meter comprises first transducer, second transducer, transducer pipe laying, commutation circuit, radiating circuit, receiving circuit and control chip, and described first transducer and second transducer are located on the transducer pipe laying, and connects commutation circuit; The input end of described radiating circuit connects control chip; Output terminal connects commutation circuit, and described receiving circuit input end connects commutation circuit, and output terminal connects control chip.
Commutation circuit is used to switch alternately being connected of radiating circuit and receiving circuit and first transducer and second transducer, realizes transmitting and receiving under hyperacoustic following current and the adverse current two states.At first; First transducer, second transducer are connected with receiving circuit with radiating circuit respectively through commutation circuit and are connected; Control chip emission ultrasonic exciting signal controlling first transducer sends ultrasound wave; The echoed signal that second transducer receives is stored in the control chip through receiving circuit, as first group of signal of related operation; Afterwards, control chip sends switching signal, changes the state of commutation circuit; Second transducer is connected with radiating circuit; First transducer is connected with receiving circuit, and control chip emission ultrasonic exciting signal controlling second transducer sends ultrasound wave, the echoed signal that first transducer receives; Through being stored in the control chip, as second group of signal of related operation through receiving circuit.Control chip carries out related operation to two groups of signals, calculates two signal intervals, and obtains the flow rate value, and constantly repeats said process.
Described receiving circuit comprises amplifying circuit, filtering circuit and AD Acquisition Circuit, and described commutation circuit, amplifying circuit, filtering circuit, AD Acquisition Circuit are connected with control chip successively.
Described filtering circuit is a bandwidth-limited circuit.
Described AD Acquisition Circuit is a high frequency AD Acquisition Circuit.
Described first transducer and second transducer are arranged on the transducer pipe laying with the monophony arrangement, and the angle between first transducer, second transducer and the transducer pipe laying is 30 °～60 °.
This gas meter also comprises the LCD display circuit and the telecommunication circuit that is used to be connected host computer that is used to show flow rate information.
Described telecommunication circuit is a serial communication circuit.
Compared with prior art; The utility model is incorporated into the correlation method theory in the time difference method flowmeter; Two signals that carry out related operation are exactly two ultrasonic echo signals along contrary emission, need not pass through noise demodulation, also need not pass through voltage ratio link such as; Hardware is simplified greatly, has overcome the development difficult point of traditional time difference method and correlation method flowmeter.
Description of drawings
Fig. 1 is the structural representation of the utility model;
Fig. 2 is the schematic diagram of the utility model;
Fig. 3 is the perspective view of the transducer pipe laying of the utility model;
Fig. 4 is the cut-open view vertically of the transducer pipe laying of the utility model.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the utility model is elaborated.
Embodiment
Shown in Fig. 1～4; A kind of monophony correlation method ultrasonic gas flowmeter, this gas meter comprise first transducer 1, second transducer 2, transducer pipe laying 9, commutation circuit 3, radiating circuit 4, receiving circuit 6, control chip 5, LCD display circuit 7 and telecommunication circuit 8.First transducer 1 and second transducer 2 are separately positioned on the arm 91,92 on the transducer pipe laying 9 with the monophony arrangement, and the angle between first transducer 1, second transducer 2 and the transducer pipe laying 9 is 30 °.First transducer 1, second transducer 2, radiating circuit 4 and receiving circuit 6 all are connected with commutation circuit 3; Through commutation circuit 3 radiating circuit 4, receiving circuit 6 alternately are connected with first transducer 1, second transducer 2, realize transmitting and receiving under hyperacoustic following current and the adverse current two states.The output terminal of control chip 5 connects radiating circuit 4; Input end connects receiving circuit 6; This receiving circuit 6 comprises amplifying circuit 61, filtering circuit 62 and AD Acquisition Circuit 63, and commutation circuit 3, amplifying circuit 61, filtering circuit 62, AD Acquisition Circuit 63 and control chip 5 are connected successively.Telecommunication circuit 8 all is connected with control chip 5 with LCD display circuit 7, is used for and upper machine communication and demonstration flow rate information.Filtering circuit 62 is a bandwidth-limited circuit, and AD Acquisition Circuit 63 is a high frequency AD Acquisition Circuit, and telecommunication circuit 8 is a serial communication circuit.
Fig. 2 has shown the ultimate principle when the utility model is measured; Ultrasound wave following current, adverse current are respectively launched once, and then receiving transducer can receive two echoed signals, because the ultrasonic waves transmitted signal is identical; Fluid state is identical; These two echoed signal shapes are identical, and time-delay τ is just arranged on time domain, these two echoed signals are carried out related function calculate the value that can draw τ.τ is ultrasound wave concurrent-countercurrent propagation time difference.V is a rate of flow of fluid, and α is A, B and rate of flow of fluid angular separation, and L is the distance between A, the B, i.e. sound channel length.C is the velocity of propagation of ultrasound wave in this stationary fluid.Can know that by the time difference method principle then the ultrasound wave following current travel-time is:
The ultrasound wave adverse current travel-time is:
Get according to two formulas:
If obtain τ, just can obtain fluid-flow rate v, thereby obtain fluid flow Q through related operation.
The course of work of the utility model is: at first; First transducer 1, second transducer 2 are connected with receiving circuit 6 with radiating circuit 4 respectively through commutation circuit 3 and are connected, and control chip 5 is launched ultrasonic exciting signal controlling first transducer 1 and sent ultrasound wave, the echoed signal that second transducer 2 receives; Through amplification, Filtering Processing; Gathered by AD Acquisition Circuit 63, and be stored in the control chip 5, as first group of signal of related operation; Afterwards, control chip 5 sends switching signal, changes the state of commutation circuit 3; Second transducer 2 is connected with radiating circuit 3; First transducer 1 is connected with receiving circuit 6, and control chip 5 emission ultrasonic exciting signal controlling second transducer 2 sends ultrasound wave, the echoed signal that first transducer 1 receives; Be stored in the control chip 5 through receiving circuit 6, as second group of signal of related operation.5 pairs of two groups of signals of control chip carry out related operation, calculate two signal intervals, and obtain the flow rate value, are shown on the LCD display circuit.
In actual measurement; Control chip 5 adopts the Cyclone Series FPGA of altera corp: the EP1C6Q240C8 chip, and the pulse signal of control radiating circuit 4 emission 200KHz, the stimulated emission transducer sends ultrasonic signal; After receiving transducer receives echoed signal; Behind amplifying circuit 61 and filtering circuit 62, get into AD Acquisition Circuit 63, the AD chip of AD Acquisition Circuit 63 adopts the high-speed ADC of 10 bit resolution SF 10MHz of Maxim company: the MAX1426 chip.The data of gathering are deposited in is used for related function calculating in the control chip 5.Afterwards, change second group of signal of commutation circuit 3 state acquisitions, carry out related operation; Search out the peak point of related function; Through calculating rate of flow of fluid, show at last, also can information about fluids be sent to host computer through telecommunication circuit 8 through LCD display circuit 7.
The utility model is incorporated into the correlation method theory in the time difference method flowmeter; Two signals that carry out related operation are exactly two ultrasonic echo signals along contrary emission; Need not pass through noise demodulation; Also need not pass through voltage ratio link such as, hardware is simplified greatly, has overcome the development difficult point of traditional time difference method and correlation method flowmeter.
Claims (8)
1. monophony correlation method ultrasonic gas flowmeter; It is characterized in that; This gas meter comprises first transducer, second transducer, transducer pipe laying, commutation circuit, radiating circuit, receiving circuit and control chip, and described first transducer and second transducer are located on the transducer pipe laying, and connects commutation circuit; The input end of described radiating circuit connects control chip; Output terminal connects commutation circuit, and described receiving circuit input end connects commutation circuit, and output terminal connects control chip.
2. a kind of monophony correlation method ultrasonic gas flowmeter according to claim 1; It is characterized in that; Described receiving circuit comprises amplifying circuit, filtering circuit and AD Acquisition Circuit, and described commutation circuit, amplifying circuit, filtering circuit, AD Acquisition Circuit are connected with control chip successively.
3. a kind of monophony correlation method ultrasonic gas flowmeter according to claim 2 is characterized in that described filtering circuit is a bandwidth-limited circuit.
4. a kind of monophony correlation method ultrasonic gas flowmeter according to claim 2 is characterized in that described AD Acquisition Circuit is a high frequency AD Acquisition Circuit.
5. a kind of monophony correlation method ultrasonic gas flowmeter according to claim 1 is characterized in that described first transducer and second transducer are arranged on the transducer pipe laying with the monophony arrangement.
6. a kind of monophony correlation method ultrasonic gas flowmeter according to claim 1 is characterized in that the angle between first transducer, second transducer and the transducer pipe laying is 30 °～60 °.
7. a kind of monophony correlation method ultrasonic gas flowmeter according to claim 1 is characterized in that this gas meter also comprises LCD display circuit and telecommunication circuit.
8. a kind of monophony correlation method ultrasonic gas flowmeter according to claim 7 is characterized in that described telecommunication circuit is a serial communication circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203638389U CN202229790U (en) | 2011-09-26 | 2011-09-26 | Single track correlation method ultrasonic gas flow meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203638389U CN202229790U (en) | 2011-09-26 | 2011-09-26 | Single track correlation method ultrasonic gas flow meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202229790U true CN202229790U (en) | 2012-05-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203638389U Expired - Fee Related CN202229790U (en) | 2011-09-26 | 2011-09-26 | Single track correlation method ultrasonic gas flow meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202229790U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104569484A (en) * | 2015-01-27 | 2015-04-29 | 长春建筑学院 | Multi-input multi-output array type ultrasound anemometry system and method |
| CN113340363A (en) * | 2021-06-09 | 2021-09-03 | 河北大学 | High-precision wide-range ultrasonic flow measurement device and measurement method |
| CN113865660A (en) * | 2021-10-12 | 2021-12-31 | 重庆智慧水务有限公司 | Flow passage core body, flow passage structure and ultrasonic water meter |
-
2011
- 2011-09-26 CN CN2011203638389U patent/CN202229790U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104569484A (en) * | 2015-01-27 | 2015-04-29 | 长春建筑学院 | Multi-input multi-output array type ultrasound anemometry system and method |
| CN113340363A (en) * | 2021-06-09 | 2021-09-03 | 河北大学 | High-precision wide-range ultrasonic flow measurement device and measurement method |
| CN113865660A (en) * | 2021-10-12 | 2021-12-31 | 重庆智慧水务有限公司 | Flow passage core body, flow passage structure and ultrasonic water meter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120523 Termination date: 20140926 |
|
| EXPY | Termination of patent right or utility model |