CN102914333B - Detection method of using ultrasonic waves for flow detection - Google Patents
Detection method of using ultrasonic waves for flow detection Download PDFInfo
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- CN102914333B CN102914333B CN201210374786.4A CN201210374786A CN102914333B CN 102914333 B CN102914333 B CN 102914333B CN 201210374786 A CN201210374786 A CN 201210374786A CN 102914333 B CN102914333 B CN 102914333B
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Abstract
The invention discloses a detection method of using ultrasonic waves for flow detection. The detection method includes: an ultrasonic transducer group arranged on a pipe section of a measuring pipe is used for measuring a down-flow time and a reverse-flow time when the ultrasonic waves are in down-flow transmission and reverse-flow transmission in the pipe section respectively; to-be-measured gas is diffused freely to two static speed pipes communicated with the measuring pipe when flowing through the pipe section of the measuring pipe provided with the ultrasonic transducer group, and the corresponding sound path is divided by the practical transmission time of the ultrasonic waves in the corresponding static speed pipe so that the transmission speed in each of the two static speed pipes can be obtained; the transmission speeds of the ultrasonic waves are substituted into an ultrasonic wave transmission speed computational formula so that the ultrasonic wave transmission speeds are obtained; and measured data are substituted into an equation to obtain the flow velocity of to-be-measured fluid in the measuring pipe, so that the flow of the to-be-measured fluid is obtained. The gas in the static speed pipes and the to-be-measured gas in the measuring pipe are guaranteed to be kept in the same state constantly by the aid of the detection method, and measuring accuracy degree is improved.
Description
Technical field
The invention belongs to gas flow measurement technical field, be specifically related to a kind of detection method of utilizing ultrasound examination flow.
Background technology
Measuring ultrasonic wave flow technology be a kind of while utilizing ultrasonic signal to propagate in fluid the flow rate information of fluid measure the measuring technique of fluid flow, the feature 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, Time-difference Ultrasonic Flow pick-up unit is broadly divided into the types such as time difference method, frequency-difference method, wave beam deflection method, Doppler method, the wherein most widely used flow detector based on time difference method at present.
In fact, because ultrasonic signal is compared with static medium in fluid media (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, thereby makes the travel-time life period of concurrent-countercurrent direction ultrasonic signal poor.And transit time ultrasonic flow meters exists linear dependence principle to measure according to the flow velocity of fluid media (medium) and mistiming, therefore as long as Accurate Determining following current time and adverse current time, according to the flow velocity of fluid media (medium) and the linear dependence of following current time and adverse current time, can obtain the flow velocity of fluid media (medium), and then obtain the flow of gas to be measured.As disclosed a kind of transit time ultrasonic flow meters in the Chinese invention patent application that is CN101886939A at application publication number, this ultrasonic flow meter comprises measuring tube, on the pipeline section of measuring tube along measuring tube axially and be correlation structure fabric and be equipped with two transceivers and mutually alternately corresponding as radiated element with receive two ultrasonic transducers of original paper, the note mistiming is △ t, △ t=t
2-t
1, t wherein
2for adverse current time, t
1for the following current time, wherein,
Obtain following equation:
△t＝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
1can eliminate the impact of τ, S is according to the measured propagation sound path obtaining of 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, the flow velocity that v is fluid media (medium), and v ' is the flow velocity of the fluid media (medium) component velocity in ultrasonic propagation direction, f (θ) is trigonometric function.For aforesaid equation (1) and (2), the flow velocity v of fluid media (medium) and △ t, S, C
f, and f (θ) relevant, wherein S and f (θ) just can directly measure in the situation that structure of ultrasonic flowmeter is certain, only need to measure to calculate △ t and C
f, and △ t can pass through t
2-t
1measurement calculates, and only has C
fneeding compensation to calculate just can obtain.
Ultrasonic transducer on the measuring tube of the device for detecting ultrasonic wave flow adopting in above-mentioned quoted patent documents is correlation structural arrangement, and when actual measurement, the all right V-shaped reflection configuration of ultrasonic transducer or other structural arrangement on measuring tube, and when adopting other arrangement forms, calculate following current time and adverse current during the time, at formula
and
in that change is exactly the flow velocity of sound path S and the fluid media (medium) component velocity v in ultrasonic propagation direction, and sound path S and f (θ) all can directly measure according to concrete arrangement form.So no matter adopt which kind of 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 factors, comprises gas composition to be measured, temperature, pressure etc., and in common environmental factor, temperature is the most serious on the impact of ultrasonic velocity, and pressure also has important impact to ultrasonic velocity.So must carry out various compensation calculating just can draw and calculate the velocity of propagation C of ultrasound wave in fluid media (medium)
f, such as, in air, temperature can be according to formula c on the impact of ultrasonic velocity
air=331.45+0.61t(t Celsius temperature) calculate, and pressure can be 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) weighed.And gas composition to be measured to ultrasound wave the velocity of propagation C in fluid media (medium)
fimpact only by ultrasonic flow device self, also cannot realize at present, can only solve and pipeline gas composition to be measured changes by on-site proving, ultrasonic flow device is realized to Measurement accuracy and has brought very large difficulty.。
Summary of the invention
The object of the present invention is to provide a kind of detection method of utilizing ultrasound examination flow, to solve, in prior art, need to compensate calculating for various environmental factors and just can draw real ultrasound wave velocity of propagation C in fluid media (medium)
fand affect the technical matters of measuring accuracy.
For achieving the above object, the technical scheme of the detection method of ultrasound examination flow of utilizing provided by the present invention is: utilize the detection method of ultrasound examination flow, comprise the steps:
1., when gas flow to be measured is crossed measuring tube, the following current time t when being arranged in ultrasonic transducer group on the pipeline section of measuring tube and measuring ultrasound wave following current is propagated in pipeline section
1and the adverse current time t of adverse current while propagating
2, gas to be measured flow through measuring tube be furnished with the pipeline section of ultrasonic transducer group time free diffusing in two that are connected with measuring tube quiet fast pipes, on these two quiet fast pipes, be furnished with respectively for measure the ultrasonic transducer of ultrasonic propagation velocity at quiet fast pipe, according to the layout of the upper ultrasonic transducer of quiet speed pipe, obtain the measurement sound path that ultrasound wave is propagated in the quiet fast pipe of correspondence, the length that on two quiet fast pipes two are measured sound path differs 1 times, by the ultrasonic transducer on the quiet fast pipe of correspondence, launch and receive ultrasound wave to obtain the actual propagation time of ultrasound wave in corresponding measurement sound path, by corresponding measurement sound path, divided by ultrasound wave, the actual propagation time in the quiet fast pipe of correspondence can obtain respectively the velocity of propagation C of ultrasound wave in two quiet fast pipes
f1and C
f2, by above-mentioned ultrasonic propagation velocity C
f1and C
f2bring in following ultrasonic propagation velocity computing formula:
Can obtain the ultrasonic propagation velocity C of ultrasound wave in gas to be measured
f, k wherein
3for penalty coefficient, its span is 0.9～1.1;
2., by t measured in step 1
1, t
2, C
fin the following equation of substitution, in the hope for the treatment of the flow velocity v of fluid measured in measuring tube, and then obtain treating the flow of fluid measured,
△t=t
2-t
1 （3）
v′＝vf(θ) （4）
Wherein, S is the measurement sound path that ultrasound wave is propagated in measuring tube, v ' is the flow velocity v of the fluid media (medium) component velocity in ultrasonic propagation direction, and f (θ) is trigonometric function, and S and f (θ) all obtain according to the layout of ultrasonic transducer group in measuring tube.
The layout of the ultrasonic transducer on described two quiet speed pipes or one of them quiet fast pipe is: the ultrasonic transducer on quiet fast pipe is furnished with two at the axial two ends of quiet speed pipe, and one of them in two ultrasonic transducers on described quiet fast pipe is radiated element, another is receiving element.
Two described quiet speed pipes or the layout of the ultrasonic transducer on one of them quiet fast pipe are: the ultrasonic transducer on quiet fast pipe is furnished with two at the axial two ends of quiet speed pipe, and two ultrasonic transducers on described quiet fast pipe are transceiver structure and mutual alternately as transmitting and receiving element.
Two described quiet speed pipes or the layout of the ultrasonic transducer on one of them quiet fast pipe are: the ultrasonic transducer on quiet fast pipe is transceiver structure, the ultrasonic transducer that is transceiver structure on described quiet fast pipe is arranged in the axial one end of quiet speed pipe, at the axial other end of quiet speed pipe, is furnished with hyperacoustic reflecting part of launching from ultrasonic transducer for reflecting.
The invention has the beneficial effects as follows: in Time-difference Ultrasonic Flow detection method provided by the present invention, make gas to be measured when flowing through the pipeline section of measuring tube free diffusing in two that are communicated with this pipeline section quiet fast pipes, because be free diffusing, at two quiet fast Guan Zhongjun, there is not pressure reduction like this, during use, by being arranged in ultrasonic transducer group on measuring tube, measure following current time and the adverse current time of ultrasound wave following current while propagating, when measuring, two quiet speed pipes are worked simultaneously, ultrasonic transducer on two quiet fast pipes is corresponding measures the hyperacoustic velocity of propagation C in quiet fast pipe separately
f1and C
f2, then utilize the ultrasonic propagation velocity C recording in two quiet fast pipes
f1and C
f2carry out related operation, obtain final accurate higher ultrasonic propagation velocity C
f, then bring following current time, adverse current time and ultrasonic propagation velocity into calculate gas to be measured in respective party formula flow velocity, and then obtain gas flow to be measured.Because quiet speed pipe is as all consistent in gas composition, temperature, pressure etc. with the environmental factor of measuring tube, can think the ultrasonic propagation velocity C that measurement calculates in quiet fast pipe
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
fmeasure the impact while calculating, save the compensation that need to carry out carrying out for each environmental factor and calculate, realize the self compensation of time difference method ultrasound gas flow, make to obtain fast, accurately ultrasonic propagation velocity C
f, after carrying it into corresponding computing formula, can accurately record the flow of gas to be measured.Detection method provided by the present invention realizes the online detection to ultrasonic propagation velocity, guarantees that gas in quiet fast pipe and the gas to be measured in measuring tube all the time under same state, improve the accuracy of measuring.
Accompanying drawing explanation
Fig. 1 is provided by the present invention for implementing the structural representation of pick-up unit of the detection method of ultrasound examination flow.
Embodiment
Utilize the embodiment of the detection method of ultrasound examination flow, the detection method in this embodiment comprises the steps:
1., when gas flow to be measured is crossed measuring tube, the following current time t when being arranged in ultrasonic transducer group on the pipeline section of measuring tube and measuring ultrasound wave following current is propagated in pipeline section
1and the adverse current time t of adverse current while propagating
2, gas to be measured flow through measuring tube be furnished with the pipeline section of ultrasonic transducer group time free diffusing in two that are connected with measuring tube quiet fast pipes, on these two quiet fast pipes, be furnished with respectively for measure the ultrasonic transducer of ultrasonic propagation velocity at quiet fast pipe, according to the layout of the upper ultrasonic transducer of quiet speed pipe, obtain the measurement sound path that ultrasound wave is propagated in the quiet fast pipe of correspondence, the length that on two quiet fast pipes two are measured sound path differs 1 times, by the ultrasonic transducer on the quiet fast pipe of correspondence, launch and receive ultrasound wave to obtain the actual propagation time of ultrasound wave in corresponding measurement sound path, by corresponding measurement sound path, divided by ultrasound wave, the actual propagation time in the quiet fast pipe of correspondence can obtain respectively the velocity of propagation C of ultrasound wave in two quiet fast pipes
f1and C
f2, by above-mentioned ultrasonic propagation velocity C
f1and C
f2bring in following ultrasonic propagation velocity computing formula:
Can obtain the ultrasonic propagation velocity C of ultrasound wave in gas to be measured
f, k wherein
3for penalty coefficient, its span is 0.9～1.1;
2., by t measured in step 1
1, t
2, C
fin the following equation of substitution, in the hope for the treatment of the flow velocity v of fluid measured in measuring tube, and then obtain treating the flow of fluid measured,
△t=t
2-t
1 （3）
v′=vf(θ) （4）
Wherein, S is the measurement sound path that ultrasound wave is propagated in measuring tube, v ' is the flow velocity v of the fluid media (medium) component velocity in ultrasonic propagation direction, and f (θ) is trigonometric function, and S and f (θ) all obtain according to the layout of ultrasonic transducer group in measuring tube.
In above-mentioned detection method, the layout of each quiet fast pipe can according to actual conditions setting, for example, 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 speed 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 speed pipe, and two ultrasonic transducers on described quiet fast pipe are transceiver structure and mutually alternately corresponding to 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 that is transceiver structure on described quiet fast pipe is arranged in the axial one end of quiet speed pipe, at the axial other end of quiet speed pipe, is furnished with hyperacoustic reflecting part of launching from ultrasonic transducer for reflecting.
In the above-mentioned layout of enumerating 1 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 sound path and the travel-time of ultrasound wave in quiet fast pipe.
In addition, in above-mentioned detection method, obtain the time delay that the actual propagation time of ultrasound wave in quiet fast pipe, the radiated element in quiet fast pipe and the travel-time between receiving element deducted in metering circuit by the ultrasound wave measuring.
Above-mentioned flow rate testing methods is applicable to mine gas drainage pipeline and gas metering, is also applicable to the measurement of gas flow under other environment.
Measurement sound path in above-described embodiment refers to that ultrasound wave is sent by the ultrasonic transducer as radiated element, then by ultrasonic transducer as receiving element receive the distance of process.Measure the layout of the ultrasonic transducer of sound path in quiet fast pipe and determine, ultrasonic transducer is being arranged on to quiet fast Guan Shanghou, the measurement sound path in this quiet fast pipe is determined value.
As shown in Figure 1, a kind of for implementing to utilize the pick-up unit of the detection method of ultrasound examination flow to comprise the measuring tube 2 of crossing for gas flow to be measured, on the pipeline section of measuring tube 2, be furnished with the ultrasonic transducer group of the adverse current time when measuring the following current time of ultrasound wave when gas following current to be measured is propagated and adverse current and propagate, this ultrasonic transducer group comprises two transceivers, and alternately corresponding conduct transmits and receives the ultrasonic transducer 1 of element, the V-shaped reflection configuration of the ultrasonic transducer of two transceivers is along on the axial arranged measuring tube of measuring tube herein.On described measuring tube 2, being fixed with two pipeline sections that are provided with ultrasonic transducer group with measuring tube is connected, and the quiet speed pipe for the gas free diffusing to be measured in this pipeline section, the length of two quiet fast pipes differs twice, two quiet fast pipes are the quiet speed pipe 6 of the first quiet speed pipe 3 and second, wherein, the first quiet speed pipe 3 is connected on measuring tube by the first anemostat 5, and the first quiet fast pipe is connected with measuring tube by the first anemostat, and the second quiet speed pipe 6 is connected on measuring tube by the second anemostat 8, and the second quiet fast pipe is connected with measuring tube by the second anemostat, the first anemostat herein and the second anemostat are axially furnished with two along quiet speed pipe respectively, and apart more closely to prevent occurring gas pulsation in quiet fast pipe.On the first quiet speed pipe 3, be furnished with in the quiet fast pipe of correspondence and launch and receive ultrasound wave for measuring the ultrasonic transducer 4 of ultrasonic propagation velocity.And be furnished with on the second quiet speed pipe 6, in the quiet fast pipe of correspondence, launch and receive ultrasound wave for measuring the ultrasonic transducer 7 of ultrasonic propagation velocity, ultrasonic transducer in two quiet fast pipes herein adopts identical arrangement: the ultrasonic transducer on quiet fast pipe is furnished with two at the axial two ends of quiet speed pipe, and one of them in two ultrasonic transducers on described quiet fast pipe is radiated element, another is receiving element.On the first quiet speed pipe 3, there is ultrasonic transducer in quiet fast pipe 4 by this and arrange the first measurement sound path of determining, in the second quiet speed, manage on 6 and have the second measurement sound path that 7 layouts of the ultrasonic transducer in quiet fast pipe are determined by this, the first length of measuring sound path and the second measurement sound path herein differs one times.
Measurement sound path in above-described embodiment refers to that ultrasound wave is sent by the ultrasonic transducer as radiated element, then by ultrasonic transducer as receiving element receive the distance of process.Measure the layout of the ultrasonic transducer of sound path in quiet fast pipe and determine, ultrasonic transducer is being arranged on to quiet fast Guan Shanghou, the measurement sound path in this quiet fast pipe is determined value.
During measurement, after the quiet speed pipe 3,6 of gas free diffusing to two to be measured in buret to be measured, the ultrasonic transducer in two quiet fast pipes is started working, and then measures and calculate the ultrasonic propagation velocity C of two ultrasound waves in gas to be measured in two quiet fast pipes
f1and C
f2, by C
f1and C
f2bring in the formula (1) in above-mentioned detection method and obtain ultrasonic propagation velocity C
f, and then by C
fin the corresponding calculation equation of substitution, can obtain the flow velocity of gas to be measured to be measured, and then record the flow of gas to be measured in measuring tube.
In above-described embodiment, two ultrasonic transducers in the ultrasonic transducer group in measuring tube are 45 ° of V-types to be arranged, in other embodiments, the V-type that also can be other angles is arranged.
In above-described embodiment, the V-shaped reflection configuration of two ultrasonic transducers in ultrasonic transducer group in measuring tube is arranged, in other embodiments, also can adopt the arrangement form that is the correlation structure crossing with measuring tube axioversion of the prior art, can not affect its measurement result.
In above-described embodiment, the V-shaped reflection configuration of two ultrasonic transducers in the ultrasonic transducer group in measuring tube is arranged, in other embodiments, also can adopt the arrangement form that is four ultrasonic transducers of X-type two-channel layout of the prior art.Four ultrasonic transducers that are X-type layout on measuring tube 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 and the adverse current time of impact when measuring ultrasound wave and propagating in the fluid of measuring tube.
In above-described embodiment, the V-shaped reflection configuration of two ultrasonic transducers in ultrasonic transducer group in measuring tube is arranged, in other embodiments, can also be on measuring tube in the ultrasonic transducer of two V-shaped layouts, over against side center position place, be that ultrasonic reflections position is furnished with the ultrasonic sensor as receiving element, this form of arranging three ultrasonic transducers on measuring tube can be eliminated the time delay that whole ultrasonic detection device brings because of self device, can farthest improve the measuring accuracy of following current time and adverse current time.
In above-described embodiment, the arrangement 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 speed pipe, and two ultrasonic transducers on described quiet fast pipe are transceiver structure and mutually alternately corresponding to transmitting and receiving element.
Or adopt following arrangement: the ultrasonic transducer on described quiet fast pipe is transceiver structure, the ultrasonic transducer that is transceiver structure on described quiet fast pipe is arranged in the axial one end of quiet speed pipe, at the axial other end of quiet speed pipe, is furnished with hyperacoustic reflecting part of launching from ultrasonic transducer for reflecting.
In the above-mentioned arrangement of enumerating, 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 sound path and the travel-time of ultrasound wave in quiet fast pipe.
Claims (4)
1. the detection method of utilizing ultrasound examination flow, is characterized in that, comprises the steps:
1., when gas flow to be measured is crossed measuring tube, the following current time t when being arranged in ultrasonic transducer group on the pipeline section of measuring tube and measuring ultrasound wave following current is propagated in pipeline section
1and the adverse current time t of adverse current while propagating
2, gas to be measured flow through measuring tube be furnished with the pipeline section of ultrasonic transducer group time free diffusing in two that are connected with measuring tube quiet fast pipes, on these two quiet fast pipes, be furnished with respectively for measure the ultrasonic transducer of ultrasonic propagation velocity at quiet fast pipe, according to the layout of the upper ultrasonic transducer of quiet speed pipe, obtain the measurement sound path that ultrasound wave is propagated in the quiet fast pipe of correspondence, the length that on two quiet fast pipes two are measured sound path differs 1 times, by the ultrasonic transducer on the quiet fast pipe of correspondence, launch and receive ultrasound wave to obtain the actual propagation time of ultrasound wave in corresponding measurement sound path, by corresponding measurement sound path, divided by ultrasound wave, the actual propagation time in the quiet fast pipe of correspondence can obtain respectively the velocity of propagation C of ultrasound wave in two quiet fast pipes
f1and C
f2, by above-mentioned ultrasonic propagation velocity C
f1and C
f2bring in following ultrasonic propagation velocity computing formula:
Can obtain the ultrasonic propagation velocity C of ultrasound wave in gas to be measured
f, k wherein
3for penalty coefficient, its span is 0.9～1.1;
2., by step 1. in measured t
1, t
2, C
fin the following equation of substitution in the hope of gas to be measured flow velocity v in measuring tube, and then obtain the flow of gas to be measured,
Δt＝t
2-t
1 (3)
v′＝vf(θ) (4)
Wherein, S is the measurement sound path that ultrasound wave is propagated in measuring tube, v ' is the flow velocity v of gas to be measured component velocity in ultrasonic propagation direction, and f (θ) is trigonometric function, and S and f (θ) all obtain according to the layout of ultrasonic transducer group in measuring tube.
2. the detection method of utilizing ultrasound examination flow according to claim 1, it is characterized in that, the layout of the ultrasonic transducer on described two quiet speed pipes or one of them quiet fast pipe is: the ultrasonic transducer on quiet fast pipe is furnished with two at the axial two ends of quiet speed pipe, and one of them in two ultrasonic transducers on described quiet fast pipe is radiated element, another is receiving element.
3. the detection method of utilizing ultrasound examination flow according to claim 1, it is characterized in that, two described quiet speed pipes or the layout of the ultrasonic transducer on one of them quiet fast pipe are: the ultrasonic transducer on quiet fast pipe is furnished with two at the axial two ends of quiet speed pipe, and two ultrasonic transducers on described quiet fast pipe are transceiver structure and mutual alternately as transmitting and receiving element.
4. the detection method of utilizing ultrasound examination flow according to claim 1, it is characterized in that, two described quiet speed pipes or the layout of the ultrasonic transducer on one of them quiet fast pipe are: the ultrasonic transducer on quiet fast pipe is transceiver structure, the ultrasonic transducer that is transceiver structure on described quiet fast pipe is arranged in the axial one end of quiet speed pipe, at the axial other end of quiet speed pipe, is furnished with hyperacoustic reflecting part of launching from ultrasonic transducer for reflecting.
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| CN104061995B (en) * | 2014-07-09 | 2016-08-17 | 广东小天才科技有限公司 | A kind of ultrasonic locating calibration steps and device |
| CN104713604A (en) * | 2015-04-10 | 2015-06-17 | 唐山唐仪科技有限公司 | Small-error grouping type ultrasonic flow measurement pipe section |
| CN108007549A (en) * | 2017-12-14 | 2018-05-08 | 济南希声计量技术有限公司 | The device and its application process of the static velocity of sound of measurement in real time in flow media environment |
| CN108387278B (en) * | 2018-02-09 | 2019-11-08 | 杭州山科智能科技股份有限公司 | A kind of window time automatic adjusting method of ultrasound echo signal |
| CN114018349A (en) * | 2021-10-19 | 2022-02-08 | 苏州大学 | Gas flow measuring device, measuring system and measuring method based on ultrasonic waves |
| CN115950495B (en) * | 2023-02-09 | 2023-06-09 | 青岛鼎信通讯科技有限公司 | Ultrasonic water meter measurement frequency adjusting method |
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| JP2011226910A (en) * | 2010-04-20 | 2011-11-10 | Panasonic Corp | Ultrasonic velocity flowmeter |
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