CN102829829B - A kind of Time-difference Ultrasonic Flow detection method and device - Google Patents
A kind of Time-difference Ultrasonic Flow detection method and device Download PDFInfo
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Abstract
The invention discloses a kind of Time-difference Ultrasonic Flow detection method and device, make in the method gas to be measured flow through measuring tube be furnished with the pipeline section of ultrasonic transducer group time be freely spread in quiet fast pipe, this quiet fast pipe is furnished with and launches in quiet fast pipe and to receive hyperacoustic ultrasonic transducer, according to the sound path that the layout acquisition ultrasound wave of the upper ultrasonic transducer of quiet speed pipe is propagated in quiet fast pipe, launched by the ultrasonic transducer in quiet fast pipe and receive ultrasound wave to obtain the actual propagation time of ultrasound wave in sound path, ultrasonic propagation velocity C can be obtained divided by the actual propagation time of ultrasound wave in quiet fast pipe by sound path
f, then by obtained ultrasonic propagation velocity C
fsubstitute in corresponding calculation equation and can obtain the flow velocity of gas to be measured in side links up, thus obtain the flow of gas to be measured.Time-difference Ultrasonic Flow detection method provided by the present invention and device realize the on-line checkingi to ultrasonic propagation velocity, improve the accuracy of measuring.
Description
Technical field
The invention belongs to gas flow measurement technical field, be specifically related to a kind of Time-difference Ultrasonic Flow detection method and device.
Background technology
Measuring ultrasonic wave flow technology be a kind of flow rate information of fluid when utilizing ultrasonic signal to propagate in a fluid to measure the measuring technique of fluid flow, the features such as it has non-contact measurement, measuring accuracy is high, measurement range is wide, convenient for installation and maintenance.According to the principle to input, current Time-difference Ultrasonic Flow pick-up unit is broadly divided into the types such as time difference method, frequency-difference method, beam deviation method, Doppler method, the wherein most widely used flow detector based on time difference method.
In fact, because ultrasonic signal in fluid media (medium) compared with static medium, during following current, the velocity of propagation of ultrasonic signal increases, travel-time reduces, during adverse current, the velocity of propagation of ultrasonic signal reduces, travel-time increases, thus makes the travel-time life period of concurrent-countercurrent direction ultrasonic signal poor.And to there is linear dependence principle according to the flow velocity of fluid media (medium) and mistiming in transit time ultrasonic flow meters measure, as long as therefore Accurate Determining following current time and the adverse current time, according to flow velocity and the linear dependence of following current time and adverse current time of fluid media (medium), the flow velocity of fluid media (medium) can be obtained, and then obtain the flow of gas to be measured.As at application publication number be CN101886939A Chinese invention patent application in disclose a kind of transit time ultrasonic flow meters, this ultrasonic flow meter comprises measuring tube, the pipeline section of measuring tube axially and in correlation structure fabric is equipped with two transceivers and mutually alternately corresponding to radiated element and two ultrasonic transducers receiving original paper along measuring tube, the note mistiming is Δ t, Δ t=t
2-t
1, wherein t
2for the adverse current time, t
1for the following current time, wherein,
then obtain following equation:
Δt＝t
2-t
1（2）
v′=vf(θ)（3）
Wherein, τ represents the time delay of ultrasonic signal in ultrasonic transducer and circuit, t
2-t
1the impact of τ can be eliminated, the propagation sound path of S for obtaining measured by the layout of ultrasonic transducer group in device for detecting ultrasonic wave flow, C
ffor the velocity of propagation of ultrasound wave in fluid media (medium), θ is sound channel angle, and v is the flow velocity of fluid media (medium), and v ' is then the component velocity of flow velocity on ultrasonic propagation direction of fluid media (medium), and f (θ) is trigonometric function.For aforesaid equation (1) and (2), the flow velocity v of fluid media (medium) and Δ t, S, C
f, and f (θ) relevant, wherein S and f (θ) just can directly measure when structure of ultrasonic flowmeter is certain to obtain, and only needs survey calculation Δ t and C
f, and Δ t can pass through t
2-t
1survey calculation obtains, and only has C
fneed compensation calculation just can obtain.
Ultrasonic transducer on the measuring tube of the device for detecting ultrasonic wave flow adopted in above-mentioned quoted Patent Reference is correlation structural arrangement, and when actual measurement, the all right V-shaped reflection configuration of ultrasonic transducer on measuring tube or other structural arrangement, and when calculating following current time and adverse current time when adopting other arrangement forms, at formula
and
in that change is exactly the component velocity v ' of flow velocity on ultrasonic propagation direction of sound path S and fluid media (medium), and sound path S and f (θ) all directly can measure according to concrete arrangement form and obtain.Which kind of, so no matter adopt arrangement form, finally also need to determine the velocity of propagation C of ultrasound wave in fluid media (medium)
f.
And the velocity of propagation C of ultrasound wave in fluid media (medium)
fultrasonic velocity is subject to the impact of various environmental factor, and comprise gas composition to be measured, temperature, pressure etc., in common environmental factor, the impact of temperature on ultrasonic velocity is the most serious, and pressure also has important impact to ultrasonic velocity.Just can draw calculate the velocity of propagation C of ultrasound wave in fluid media (medium) so various compensation calculation must be carried out
f, such as, in atmosphere, temperature can according to formula c on the impact of ultrasonic velocity
air=331.45+0.61t(t Celsius temperature) calculate, and pressure can according to formula on the impact of the velocity of sound
(v is the speed of sound wave in gas to be measured, and k is gas coefficient of heat insulation to be measured, and p is gas pressure intensity to be measured, and ρ is gas density to be measured) is weighed.And gas composition to be measured is to the velocity of propagation C of ultrasound wave in fluid media (medium)
fimpact also cannot realize only by ultrasonic flow device self at present, can only be solved by on-site proving and pipeline gas composition to be measured be change, Measurement accuracy is realized to ultrasonic flow device and brings very large difficulty.
Summary of the invention
The object of the present invention is to provide a kind of Time-difference Ultrasonic Flow detection method, need to compensate calculating for various environmental factor just can draw real ultrasound wave velocity of propagation C in fluid media (medium) to solve in prior art
fand affect the technical matters of measuring accuracy; Meanwhile, the present invention also provides a kind of Time-difference Ultrasonic Flow pick-up unit for implementing above-mentioned detection method.
For achieving the above object, Time-difference Ultrasonic Flow detection method provided by the present invention adopts following technical scheme: a kind of Time-difference Ultrasonic Flow detection method, comprises the steps:
1., when gas to be measured flows through measuring tube, the following current time t of ultrasound wave in pipeline section during downstream propagation is measured by the ultrasonic transducer group be arranged on the pipeline section of measuring tube
1and adverse current time t during adverse current propagation
2; Gas to be measured flow through measuring tube be furnished with the pipeline section of ultrasonic transducer group time be freely spread in quiet fast pipe, this quiet fast pipe is furnished with and launches in quiet fast pipe and to receive hyperacoustic ultrasonic transducer, according to the sound path that the layout acquisition ultrasound wave of the upper ultrasonic transducer of quiet speed pipe is propagated in quiet fast pipe, launched by the ultrasonic transducer in quiet fast pipe and receive ultrasound wave to obtain the actual propagation time of ultrasound wave in sound path, ultrasonic propagation velocity C can be obtained by sound path divided by the actual propagation time of ultrasound wave in quiet fast pipe
f;
2., by t measured in step one
1, t
2, C
fsubstitute in the hope for the treatment of the flow velocity v of fluid measured in measuring tube in following equation, and then obtain the flow treating fluid measured,
Δt＝t
2-t
1（2）
v′＝vf(θ)（3）
Wherein, S is the sound path that ultrasound wave is propagated in measuring tube, v ' is then the component velocity of flow velocity v on ultrasonic propagation direction of fluid media (medium), and f (θ) is trigonometric function, S and f (θ) all obtains according to the layout of ultrasonic transducer group in measuring tube.
The layout of the ultrasonic transducer on described quiet fast pipe is: the ultrasonic transducer on described quiet fast pipe is furnished with two at the axial two ends of quiet fast pipe, and one of them in two ultrasonic transducers on described quiet fast pipe is radiated element, another is receiving element.
The layout of the ultrasonic transducer on described quiet fast pipe is: the ultrasonic transducer on described quiet fast pipe is furnished with two at the axial two ends of quiet fast pipe, and two ultrasonic transducers on described quiet fast pipe are transceiver structure and mutual alternately corresponding conduct transmitting and receiving element.
The layout of the ultrasonic transducer on described quiet fast pipe is: the ultrasonic transducer on described quiet fast pipe is transceiver structure, the ultrasonic transducer in transceiver structure on described quiet fast pipe is arranged in the axial one end of quiet fast pipe, is furnished with for reflecting the hyperacoustic reflecting part launched from ultrasonic transducer at the axial other end of quiet fast pipe.
Time-difference Ultrasonic Flow pick-up unit provided by the present invention adopts following technical scheme: a kind of Time-difference Ultrasonic Flow pick-up unit, comprise measuring tube, the pipeline section of measuring tube is furnished with the ultrasonic transducer group for measuring the adverse current time when following current time of ultrasound wave in gas to be measured during downstream propagation and adverse current are propagated, described measuring tube is fixed with the pipeline section being provided with ultrasonic transducer group with measuring tube to be connected, and manage for the quiet speed of the gas free diffusing to be measured in this pipeline section, quiet fast pipe is furnished with and launches in quiet fast pipe and to receive ultrasound wave for the ultrasonic transducer measuring ultrasonic propagation velocity.
Described quiet fast pipe is connected with measuring tube by anemostat, and the pipeline section that described anemostat is provided with ultrasonic transducer group with described measuring tube is connected.
Ultrasonic transducer on described quiet fast pipe is furnished with two at the axial two ends of quiet fast pipe, and one of them in two ultrasonic transducers on described quiet fast pipe is radiated element, another is receiving element.
Ultrasonic transducer on described quiet fast pipe is furnished with two at the axial two ends of quiet fast pipe, and two ultrasonic transducers on described quiet fast pipe are transceiver structure and mutual alternately corresponding conduct transmitting and receiving element.
Ultrasonic transducer on described quiet fast pipe is transceiver structure, the ultrasonic transducer in transceiver structure on described quiet fast pipe is arranged in the axial one end of quiet fast pipe, is furnished with for reflecting the hyperacoustic reflecting part launched from ultrasonic transducer at the axial other end of quiet fast pipe.
The invention has the beneficial effects as follows: in Time-difference Ultrasonic Flow detection method provided by the present invention, gas to be measured is made to be freely spread in the quiet fast pipe be communicated with this pipeline section when flowing through the pipeline section of measuring tube, because be free diffusing, in quiet fast pipe, there is not pressure reduction like this, thus in quiet fast pipe, directly can measure the velocity of propagation C of ultrasound wave in survey gas obtained
f, because quiet speed pipe is as all consistent in gas composition, temperature, pressure etc. with the environmental factor of measuring tube, the ultrasonic propagation velocity C that survey calculation obtains in quiet fast pipe can be thought
fbe the velocity of propagation under the gas static state to be measured of ultrasound wave in measuring tube, avoid gas composition to ultrasonic propagation velocity C
fimpact during survey calculation, saves the compensation calculation needing to carry out carrying out for each environmental factor, realizes the self compensation of time difference method ultrasound gas flow, make it possible to fast, obtains ultrasonic propagation velocity C accurately
f, after carrying it into corresponding computing formula, accurately can record the flow of gas to be measured.Realize the on-line checkingi to ultrasonic propagation velocity in Time-difference Ultrasonic Flow detection method provided by the present invention, under ensureing that the gas in quiet fast pipe and the gas to be measured in measuring tube are in same state all the time, improve the accuracy of measuring.
Time-difference Ultrasonic Flow pick-up unit provided by the present invention, measuring tube is communicated with the quiet speed pipe for the gas free diffusing to be measured in this pipeline section on the pipeline section being provided with ultrasonic transducer group, the ultrasonic transducer for measuring ultrasonic propagation velocity is furnished with in quiet fast pipe, during use, following current time when measuring ultrasound wave downstream propagation by the ultrasonic transducer group be arranged on measuring tube and adverse current time, and survey calculation obtains the velocity of propagation of ultrasound wave in the gas to be measured of quiet fast pipe in quiet fast pipe, then by the following current time, adverse current time and ultrasonic propagation velocity bring the flow velocity calculating gas to be measured in respective party formula into, and then obtain gas flow to be measured.In pick-up unit provided by the present invention, measuring tube is provided with quiet speed pipe, during measurement, gas to be measured in measuring tube is freely spread in quiet fast pipe, environmental factor residing for quiet fast pipe is as gas composition, temperature, environmental factor in the factors such as pressure and measuring tube always, the ultrasonic propagation velocity calculated measured by quiet fast pipe is the velocity of propagation in the gas of ultrasound wave at measuring tube, gas composition is eliminated like this by directly measuring the velocity of propagation of ultrasound wave in gas to be measured at quiet speed pipe, temperature, the impact of the factors such as pressure, realize self-compensating function, save in prior art and need to consider various environmental factor and the various compensation calculation done.Structure of the detecting device provided by the present invention realizes the on-line checkingi to ultrasonic propagation velocity, under ensureing that the gas in quiet fast pipe and the gas to be measured in measuring tube are in same state all the time, improve the accuracy of measuring, be convenient to apply the measurement of the gas flow under various environment.
Accompanying drawing explanation
Fig. 1 is the structural representation of Time-difference Ultrasonic Flow pick-up unit provided by the present invention.
Embodiment
An embodiment for Time-difference Ultrasonic Flow detection method, the detection method in this embodiment comprises the steps:
1., when gas to be measured flows through measuring tube, the following current time t of ultrasound wave in pipeline section during downstream propagation is measured by the ultrasonic transducer group be arranged on the pipeline section of measuring tube
1and adverse current time t during adverse current propagation
2; Gas to be measured flow through measuring tube be furnished with the pipeline section of ultrasonic transducer group time be freely spread in quiet fast pipe, this quiet fast pipe is furnished with and launches in quiet fast pipe and to receive hyperacoustic ultrasonic transducer, according to the sound path that the layout acquisition ultrasound wave of the upper ultrasonic transducer of quiet speed pipe is propagated in quiet fast pipe, launched by the ultrasonic transducer in quiet fast pipe and receive ultrasound wave to obtain the actual propagation time of ultrasound wave in sound path, ultrasonic propagation velocity C can be obtained by sound path divided by the actual propagation time of ultrasound wave in quiet fast pipe
f;
2., by t measured in step one
1, t
2, C
fsubstitute in the hope for the treatment of the flow velocity v of fluid measured in measuring tube in following equation, and then obtain the flow treating fluid measured,
Δt＝t
2-t
1（2）
v′=vf(θ)（3）
Wherein, S is the sound path that ultrasound wave is propagated in measuring tube, v ' is then the component velocity of flow velocity v on ultrasonic propagation direction of fluid media (medium), and f (θ) is trigonometric function, S and f (θ) all obtains according to the layout of ultrasonic transducer group in measuring tube.
Additionally provide a kind of method for on-line checkingi ultrasonic propagation velocity in Time-difference Ultrasonic Flow detection in the above-mentioned methods simultaneously, comprise the steps:
1. measuring tube, used in Time-difference Ultrasonic Flow detects is communicated with quiet speed pipe, make gas to be measured flow through measuring tube be furnished with the pipeline section of ultrasonic transducer group time be freely spread in quiet fast pipe, this quiet fast pipe is furnished with and launches in quiet fast pipe and to receive hyperacoustic ultrasonic transducer;
2., according to the sound path that the layout acquisition ultrasound wave of the upper ultrasonic transducer of quiet speed pipe is propagated in quiet fast pipe, launched by the ultrasonic transducer in quiet fast pipe and receive ultrasound wave to obtain the actual propagation time of ultrasound wave in sound path, ultrasonic propagation velocity C can be obtained by sound path divided by the actual propagation time of ultrasound wave in quiet fast pipe
f.
In above-mentioned two detection methods, the layout of quiet fast pipe can be arranged according to actual conditions, such as, can adopt following three kinds of distribution forms:
The layout 1 of the ultrasonic transducer on quiet fast pipe is: the ultrasonic transducer on described quiet fast pipe is furnished with two at the axial two ends of quiet fast pipe, and one of them in two ultrasonic transducers on described quiet fast pipe is radiated element, another is receiving element.
The layout 2 of the ultrasonic transducer on quiet fast pipe is: the ultrasonic transducer on described quiet fast pipe is furnished with two at the axial two ends of quiet fast pipe, and two ultrasonic transducers on described quiet fast pipe are transceiver structure and mutual alternately corresponding conduct transmitting and receiving element.
The layout 3 of the ultrasonic transducer on quiet fast pipe is: the ultrasonic transducer on described quiet fast pipe is transceiver structure, the ultrasonic transducer in transceiver structure on described quiet fast pipe is arranged in the axial one end of quiet fast pipe, is furnished with for reflecting the hyperacoustic reflecting part launched from ultrasonic transducer at the axial other end of quiet fast pipe.
In the above-mentioned layout 1 enumerated and layout 2, ultrasonic transducer on quiet fast pipe all adopts correlation structure, in other embodiments, ultrasonic transducer on quiet fast pipe can also adopt V-type reflection configuration layout or other layouts, as long as can measure the sound path of ultrasound wave in quiet fast pipe and travel-time.
In addition, in above-mentioned detection method, the time delay that the actual propagation time of ultrasound wave in quiet fast pipe was deducted in metering circuit by the travel-time between the radiated element of the ultrasound wave measured in quiet fast pipe and receiving element obtains.
Above-mentioned Time-difference Ultrasonic Flow detection method is applicable to mine gas drainage pipeline and gas metering, is also applicable to the measurement of gas flow under other environment.
Below in conjunction with accompanying drawing introduction for implementing the device of above-mentioned two kinds of methods.
As shown in Figure 1, a kind of embodiment of the Time-difference Ultrasonic Flow pick-up unit for implementing Time-difference Ultrasonic Flow detection method, pick-up unit in this embodiment comprises measuring tube 2, the pipeline section of measuring tube 2 is furnished with the ultrasonic transducer group for measuring the adverse current time when following current time of ultrasound wave in gas to be measured during downstream propagation and adverse current are propagated, this ultrasonic transducer group comprises two transceivers, and the alternately corresponding ultrasonic transducer 1 as transmitting and receiving element, the V-shaped reflection configuration of ultrasonic transducer 1 of two transceivers is along on the axial arranged measuring tube of measuring tube herein.Described measuring tube 2 is fixed with the pipeline section being provided with ultrasonic transducer group with measuring tube to be connected and the quiet fast pipe 3 supplying the gas free diffusing to be measured in this pipeline section, quiet fast pipe 3 is connected on measuring tube 2 by anemostat 5, and quiet fast pipe 3 is connected with the pipeline section being provided with ultrasonic transducer group of measuring tube by anemostat, anemostat herein is axially furnished with two along quiet fast pipe, and these two anemostats are at a distance of nearer to prevent from occurring gas pulsation in quiet fast pipe.Quiet fast pipe 3 is furnished with and launches in quiet fast pipe and to receive ultrasound wave for the ultrasonic transducer 4 measuring ultrasonic propagation velocity.The layout of the ultrasonic transducer in quiet fast pipe is herein: the ultrasonic transducer 4 on described quiet fast pipe is furnished with two at the axial two ends of quiet fast pipe, and one of them in two ultrasonic transducers on described quiet fast pipe is radiated element, another is receiving element.
Simultaneously, also disclose a kind of embodiment for the device of on-line checkingi ultrasonic propagation velocity in Time-difference Ultrasonic Flow detection in FIG, device in this embodiment is connected on measuring tube 2 used in Time-difference Ultrasonic Flow detection when comprising use, and be connected with the pipeline section being furnished with ultrasonic transducer group of measuring tube for the quiet fast pipe 3 of the gas free diffusing to be measured flow through in this pipeline section, quiet fast pipe 3 is connected on measuring tube 2 by anemostat 5, and quiet fast pipe is connected with the pipeline section being provided with ultrasonic transducer group of measuring tube by anemostat, anemostat herein is axially furnished with two along quiet fast pipe, and these two anemostats are at a distance of nearer to prevent from occurring gas pulsation in quiet fast pipe.Quiet fast pipe 3 is furnished with and launches in quiet fast pipe and to receive ultrasound wave for measurement ultrasonic propagation velocity C
fultrasonic transducer 4, the layout of the ultrasonic transducer in quiet fast pipe is herein: the ultrasonic transducer on described quiet fast pipe is furnished with two at the axial two ends of quiet fast pipe, and one of them in two ultrasonic transducers on described quiet fast pipe is radiated element, another is receiving element.
In above-mentioned two embodiments, two ultrasonic transducers in the ultrasonic transducer group in measuring tube are that 45 ° of V-types are arranged, in other embodiments, also can the V-type in other angles arrange.Or adopt as other layout structures such as Z-type or X-type, as long as corresponding hyperacoustic following current time and adverse current time can be recorded.Or on measuring tube, the ultrasonic sensor as receiving element can also be furnished with in the positive offside center position place of the ultrasonic transducer of two V-shaped layouts and ultrasonic reflections position, thisly on measuring tube, arrange the time delay that the form of three ultrasonic transducers can be eliminated whole ultrasonic detection device and brings because of own device, farthest can improve the measuring accuracy of following current time and adverse current time.
In above-mentioned two embodiments, the V-shaped reflection configuration of two ultrasonic transducers in ultrasonic transducer group in measuring tube is arranged, in other embodiments, also can adopt and of the prior artly axially to tilt the arrangement form of crossing correlation structure in measuring tube, its measurement result can not be affected.
In above-mentioned two embodiments, the V-shaped reflection configuration of two ultrasonic transducers in ultrasonic transducer group in measuring tube is arranged, in other embodiments, the arrangement form of four ultrasonic transducers arranged in X-type two-channel of the prior art can also be adopted.Four on the measuring tube ultrasonic transducers arranged in X-type are transceiver structure, because four ultrasonic transducers form two and measure sound channel, like this for each sound channel, as long as have a radiated element and a receiving element, certainly, four ultrasonic transducers can be also separately radiated element or receiving element, only otherwise following current time when ultrasound wave is propagated in the fluid of measuring tube and adverse current time are measured in impact.
In above-mentioned two embodiments, the layout of the ultrasonic transducer on quiet fast pipe can also be: the ultrasonic transducer on described quiet fast pipe is furnished with two at the axial two ends of quiet fast pipe, and two ultrasonic transducers on described quiet fast pipe are transceiver structure and mutual alternately corresponding conduct transmitting and receiving element.
Or adopt following layout: the ultrasonic transducer on described quiet fast pipe is transceiver structure, the ultrasonic transducer in transceiver structure on described quiet fast pipe is arranged in the axial one end of quiet fast pipe, is furnished with for reflecting the hyperacoustic reflecting part launched from ultrasonic transducer at the axial other end of quiet fast pipe.
In the above-mentioned layout enumerated, ultrasonic transducer on quiet fast pipe all adopts correlation structure, in other embodiments, ultrasonic transducer on quiet fast pipe can also adopt V-type reflection configuration layout or other layouts, as long as can measure the sound path of ultrasound wave in quiet fast pipe and travel-time.
The method and apparatus of measurement ultrasonic propagation velocity provided by the present invention achieves direct measurement when ultrasound wave is propagated in tested gas, be ensure that the accuracy of the measured velocity of sound by quiet fast pipe, measuring method and device simple and reliable.
Claims (9)
1. a Time-difference Ultrasonic Flow detection method, is characterized in that, comprises the steps:
1., when gas to be measured flows through measuring tube, the following current time t of ultrasound wave in pipeline section during downstream propagation is measured by the ultrasonic transducer group be arranged on the pipeline section of measuring tube
1and adverse current time t during adverse current propagation
2, gas to be measured flow through measuring tube be furnished with the pipeline section of ultrasonic transducer group time be freely spread in quiet fast pipe, pressure reduction is there is not in described quiet fast pipe, this quiet fast pipe is furnished with and launches in quiet fast pipe and to receive hyperacoustic ultrasonic transducer, according to the sound path that the layout acquisition ultrasound wave of the upper ultrasonic transducer of quiet speed pipe is propagated in quiet fast pipe, launched by the ultrasonic transducer in quiet fast pipe and receive ultrasound wave to obtain the actual propagation time of ultrasound wave in sound path, ultrasonic propagation velocity C can be obtained divided by the actual propagation time of ultrasound wave in quiet fast pipe by sound path
f,
2., by step 1. in measured t
1, t
2, C
fsubstitute in the hope of the flow velocity v of gas to be measured in measuring tube in following equation, and then obtain the flow of gas to be measured,
Δt＝t
2-t
1(2)
v′＝vf(θ)(3)
Wherein, S is the sound path that ultrasound wave is propagated in measuring tube, v ' is then the component velocity of flow velocity v on ultrasonic propagation direction of gas to be measured, f (θ) is trigonometric function, S and f (θ) all obtains according to the layout of ultrasonic transducer group in measuring tube, realizes the self compensation of time difference method ultrasound gas flow.
2. Time-difference Ultrasonic Flow detection method according to claim 1, it is characterized in that, the layout of the ultrasonic transducer on described quiet fast pipe is: the ultrasonic transducer on described quiet fast pipe is furnished with two at the axial two ends of quiet fast pipe, and one of them in two ultrasonic transducers on described quiet fast pipe is radiated element, another is receiving element.
3. Time-difference Ultrasonic Flow detection method according to claim 1, it is characterized in that, the layout of the ultrasonic transducer on described quiet fast pipe is: the ultrasonic transducer on described quiet fast pipe is furnished with two at the axial two ends of quiet fast pipe, and two ultrasonic transducers on described quiet fast pipe are transceiver structure and mutual alternately corresponding conduct transmitting and receiving element.
4. Time-difference Ultrasonic Flow detection method according to claim 1, it is characterized in that, the layout of the ultrasonic transducer on described quiet fast pipe is: the ultrasonic transducer on described quiet fast pipe is transceiver structure, the ultrasonic transducer in transceiver structure on described quiet fast pipe is arranged in the axial one end of quiet fast pipe, is furnished with for reflecting the hyperacoustic reflecting part launched from ultrasonic transducer at the axial other end of quiet fast pipe.
5. one kind for implementing the Time-difference Ultrasonic Flow pick-up unit of detection method as claimed in claim 1, comprise measuring tube, the pipeline section of measuring tube is furnished with the ultrasonic transducer group for measuring the adverse current time when following current time of ultrasound wave in gas to be measured during downstream propagation and adverse current are propagated, it is characterized in that, described measuring tube is fixed with the pipeline section being provided with ultrasonic transducer group with measuring tube to be connected, and manage for the quiet speed of the gas free diffusing to be measured in this pipeline section, pressure reduction is there is not in described quiet fast pipe, quiet fast pipe is furnished with and launches in quiet fast pipe and to receive ultrasound wave for the ultrasonic transducer measuring ultrasonic propagation velocity, gas in quiet fast pipe and the gas to be measured in measuring tube are in same state all the time.
6. Time-difference Ultrasonic Flow pick-up unit according to claim 5, is characterized in that, described quiet fast pipe is connected with measuring tube by anemostat, and the pipeline section that described anemostat is provided with ultrasonic transducer group with described measuring tube is connected.
7. the Time-difference Ultrasonic Flow pick-up unit according to claim 5 or 6, it is characterized in that, ultrasonic transducer on described quiet fast pipe is furnished with two at the axial two ends of quiet fast pipe, and one of them in two ultrasonic transducers on described quiet fast pipe is radiated element, another is receiving element.
8. the Time-difference Ultrasonic Flow pick-up unit according to claim 5 or 6, it is characterized in that, ultrasonic transducer on described quiet fast pipe is furnished with two at the axial two ends of quiet fast pipe, and two ultrasonic transducers on described quiet fast pipe are transceiver structure and mutual alternately corresponding conduct transmitting and receiving element.
9. the Time-difference Ultrasonic Flow pick-up unit according to claim 5 or 6, it is characterized in that, ultrasonic transducer on described quiet fast pipe is transceiver structure, the ultrasonic transducer in transceiver structure on described quiet fast pipe is arranged in the axial one end of quiet fast pipe, is furnished with for reflecting the hyperacoustic reflecting part launched from ultrasonic transducer at the axial other end of quiet fast pipe.
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| CN108195436A (en) * | 2018-03-28 | 2018-06-22 | 上海中核维思仪器仪表有限公司 | Plug-in type Ultrasonic Wave Flowmeter measuring device and method with self-calibration function |
| CN110792424A (en) * | 2019-10-28 | 2020-02-14 | 中国海洋石油集团有限公司 | External axial type ultrasonic flow measurement device and method |
| KR102189806B1 (en) | 2020-04-03 | 2020-12-11 | 김영탁 | Ultrasonic Water meterter |
| CN113932866B (en) * | 2021-12-17 | 2022-03-11 | 河北金波嘉源测控技术有限公司 | Fluid mass flow measurement system with unfixed density in pipeline and method thereof |
| CN117368518B (en) * | 2023-12-04 | 2024-02-23 | 湖北工业大学 | System and method for measuring ultrasonic flight time in pipeline |
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| CN101251397A (en) * | 2008-04-09 | 2008-08-27 | 中国矿业大学 | By-pass type pipeline flowmeter |
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Address after: 450001 Henan city of Zhengzhou province high tech Industrial Development Zone Long Chun Road No. 10 Patentee after: Power Polytron Technologies Inc Address before: 450001 Henan city of Zhengzhou province high tech Industrial Development Zone Long Chun Road No. 10 Patentee before: Zhengzhou GL Tech Company |