CN102829829A - Method and device for detecting ultrasonic flow by time-difference method - Google Patents

Method and device for detecting ultrasonic flow by time-difference method Download PDF

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Publication number
CN102829829A
CN102829829A CN2012103030211A CN201210303021A CN102829829A CN 102829829 A CN102829829 A CN 102829829A CN 2012103030211 A CN2012103030211 A CN 2012103030211A CN 201210303021 A CN201210303021 A CN 201210303021A CN 102829829 A CN102829829 A CN 102829829A
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speed pipe
ultrasonic transducer
quiet
ultrasonic
quiet speed
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CN102829829B (en
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周正
赵彤凯
李波
张胜峰
黄理瑞
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Power Polytron Technologies Inc
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Zhengzhou GL Tech Co
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Abstract

The invention discloses a method and a device for detecting ultrasonic flow by the time-difference method. The method includes: enabling to-be-tested gases to be freely spread into a static speed pipe when the to-be-tested gases flow through a pipe section of a measuring pipe provided with an ultrasonic transducer group, the static speed pipe is provided with ultrasonic transducers used for emitting and receiving ultrasonic waves into the static speed pipe, sonic path distance of the ultrasonic waves spreading in the static speed pipe can be obtained according to arrangement of the ultrasonic transducers on the static speed pipe, actual spreading time of the ultrasonic waves in the sonic path distance can be obtained by emitting and receiving the ultrasonic waves by the ultrasonic transducers in the static speed pipe, the spreading speed Cf of the ultrasonic waves can be obtained by dividing the actual spreading time of the ultrasonic waves in the static speed pipe by the sonic path distance, flow speed of the to-be-tested gases in the measuring pipe can be obtained by substituting the obtained spreading speed Cf of the ultrasonic waves into a calculation equation, and the flow of the to-be-tested gases can be obtained. By the method and the device for detecting the ultrasonic flow by the time-difference method, online detection of the spreading speed of the ultrasonic waves can be realized, and measuring accuracy can be improved.

Description

A kind of time difference method supersonic flow quantity measuring method and device
Technical field
The invention belongs to the gas flow measurement technical field, be specifically related to a kind of time difference method supersonic flow quantity measuring method and device.
Background technology
The measuring ultrasonic wave flow technology be a kind of when utilizing ultrasonic signal in fluid, to propagate flow rate of fluid information measure the measuring technique of fluid flow, it has characteristics such as non-contact measurement, measuring accuracy is high, measurement range is wide, convenient for installation and maintenance.According to the principle to input, time difference method supersonic flow amount detecting device is broadly divided into types such as time difference method, frequency-difference method, wave beam deflection method, Doppler method, 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); The velocity of propagation of ultrasonic signal increases during following current, and the travel-time reduces, and the velocity of propagation of ultrasonic signal reduces during adverse current; Travel-time increases, thereby makes that the travel-time life period of concurrent-countercurrent direction ultrasonic signal is poor.And transit time ultrasonic flow meters exists the linear dependence principle to measure according to the flow velocity and mistiming of fluid media (medium); Therefore as long as accurately measure following current time and adverse current time; Flow velocity and the linear dependence of following current time and adverse current time according to fluid media (medium); Can obtain the flow velocity of fluid media (medium), and then obtain the flow of gas to be measured.As being to disclose a kind of transit time ultrasonic flow meters in the Chinese invention patent application of CN101886939A at application publication number; This ultrasonic flow meter comprises measuring tube; Measuring tube axially and be the correlation structural arrangement two transceivers and alternately corresponding each other as radiated element with receive two ultrasonic transducers of original paper are arranged in the pipeline section upper edge of measuring tube; The note mistiming is Δ t, Δ t=t 2-t 1, t wherein 2Be adverse current time, t 1Be the following current time, wherein,
Figure BDA00002050508800011
Figure BDA00002050508800012
Then obtain following equation:
Δt = S C f - v ′ - S C f + v ′ - - - ( 1 )
Δt=t 2-t 1 (2)
v′=vf(θ) (3)
Wherein, τ representes the time delay of ultrasonic signal in ultrasonic transducer and circuit, t 2-t 1Can eliminate the influence of τ, S is according to the measured propagation sound path that obtains of the layout of ultrasonic transducer group in the supersonic flow amount detecting device, C fBe the velocity of propagation of ultrasound wave in fluid media (medium), θ is the sound channel angle, and v is the flow velocity of fluid media (medium), and v ' then is the component velocity of flow velocity on the ultrasonic propagation direction of fluid media (medium), and f (θ) is a 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 under the certain situation of ultrasonic flow meter structure, only need measurement calculating Δ t and C fGet final product, and Δ t can pass through t 2-t 1Measurement calculates, and has only C fNeeding compensation to calculate just can obtain.
Ultrasonic transducer on the measuring tube of the supersonic flow amount detecting device that is adopted in the above-mentioned patent documents of quoting is the correlation structural arrangement; And when actual measurement; The all right V-shaped reflection configuration of ultrasonic transducer on the measuring tube or other structural arrangement; And calculate following current time and adverse current during the time when adopting other arrangement forms; That in formula
Figure BDA00002050508800021
and
Figure BDA00002050508800022
, change is exactly the component velocity v ' of flow velocity on the ultrasonic propagation direction of sound path S and fluid media (medium), 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 confirm 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 receives various Effect of Environmental, comprises gas composition to be measured, temperature, pressure etc., and in common environmental factor, temperature is the most serious to the influence of ultrasonic velocity, and pressure also has important influence to ultrasonic velocity.So must carry out various compensation calculates just can draw and calculates the velocity of propagation C of ultrasound wave in fluid media (medium) f, such as, in air, temperature can be according to formula c to the influence of ultrasonic velocity Air=331.45+0.61t (t Celsius temperature) calculates, and pressure can be according to formula to the influence of the velocity of sound
Figure BDA00002050508800023
(v is the speed of sound wave in gas to be measured, and k is a gas coefficient of heat insulation to be measured, and p is a gas pressure intensity to be measured, and ρ is a gas density to be measured) weighed.And gas composition to be measured is to the velocity of propagation C of ultrasound wave in fluid media (medium) fInfluence only also can't realize at present through ultrasonic flow device self, can only solve and pipeline gas composition to be measured changes through on-site proving, the ultrasonic flow device is realized accurately measuring having brought very big difficulty.
Summary of the invention
The object of the present invention is to provide a kind of time difference method supersonic flow quantity measuring method, just can draw real ultrasound wave velocity of propagation C in fluid media (medium) to need compensating calculating in the solution prior art to various environmental factors fAnd influence the technical matters of measuring accuracy; Simultaneously, the present invention also provides a kind of time difference method supersonic flow amount detecting device that is used to implement above-mentioned detection method.
For realizing above-mentioned purpose, time difference method supersonic flow quantity measuring method provided by the present invention adopts following technical scheme: a kind of time difference method supersonic flow quantity measuring method comprises the steps:
1., when gas stream to be measured is crossed measuring tube, measure the following current time t of ultrasound wave following current in pipeline section when propagating by the ultrasonic transducer group on the pipeline section that is arranged in measuring tube 1Adverse current time t when reaching the adverse current propagation 2Gas to be measured flow through measuring tube be furnished with the pipeline section of ultrasonic transducer group the time freely be diffused in the quiet speed pipe; Be furnished with in quiet speed pipe emission on this quiet speed pipe and receive hyperacoustic ultrasonic transducer; The layout that goes up ultrasonic transducer according to quiet speed pipe obtains the sound path that ultrasound wave is propagated in quiet speed pipe; By the emission of the ultrasonic transducer in the quiet speed pipe and receive ultrasound wave, can obtain ultrasonic propagation velocity C divided by the actual propagation time of ultrasound wave in quiet speed pipe by sound path to obtain the actual propagation time of ultrasound wave in sound path f
2., with t measured in the step 1 1, t 2, C fIn the hope of treating the flow velocity v of fluid measured in measuring tube, and then obtain treating the flow of fluid measured in the following equation of substitution,
Δt = S C f - v ′ - S C f + v ′ - - - ( 1 )
Δt=t 2-t 1 (2)
v′=vf(θ) (3)
Wherein, S is the sound path that ultrasound wave is propagated in measuring tube, and v ' then is the component velocity of flow velocity v on the ultrasonic propagation direction of fluid media (medium), and f (θ) is a trigonometric function, and S and f (θ) all obtain according to the layout of ultrasonic transducer group in the measuring tube.
The layout of the ultrasonic transducer on the described quiet speed pipe is: the ultrasonic transducer on the said quiet speed pipe is furnished with two at quiet fast tubular axis to two ends, and one of them in two ultrasonic transducers on the said quiet speed pipe is radiated element, another is receiving element.
The layout of the ultrasonic transducer on the described quiet speed pipe is: the ultrasonic transducer on the said quiet speed pipe is furnished with two at quiet fast tubular axis to two ends, and two ultrasonic transducers on the said quiet speed pipe are transceiver structure and alternately corresponding to each other transmitting and receiving element.
The layout of the ultrasonic transducer on the described quiet speed pipe is: the ultrasonic transducer on the said quiet speed pipe is the transceiver structure; The ultrasonic transducer that is the transceiver structure on the said quiet speed pipe is arranged in quiet fast tubular axis to an end, is furnished with to the other end at quiet fast tubular axis to be used for reflecting the reflecting part from the ultrasonic transducer ultrasonic waves transmitted.
Time difference method supersonic flow amount detecting device provided by the present invention adopts following technical scheme: a kind of time difference method supersonic flow amount detecting device; Comprise measuring tube; In the ultrasonic transducer group that is furnished with the adverse current time when being used for measuring following current time and the adverse current of ultrasound wave when gas following current to be measured is propagated on the pipeline section of measuring tube; Be fixed with the quiet speed pipe that is connected and supplies the gas to be measured in this pipeline section freely to spread with pipeline section that measuring tube is provided with the ultrasonic transducer group on the described measuring tube, be furnished with in quiet speed pipe emission on the quiet speed pipe and receiving ultrasound wave to be used to measure the ultrasonic transducer of ultrasonic propagation velocity.
Described quiet speed pipe is connected with measuring tube through anemostat, and said anemostat is connected with the pipeline section that described measuring tube is provided with the ultrasonic transducer group.
Ultrasonic transducer on the described quiet speed pipe is furnished with two at quiet fast tubular axis to two ends, and one of them in two ultrasonic transducers on the said quiet speed pipe is radiated element, another is receiving element.
Ultrasonic transducer on the described quiet speed pipe is furnished with two at quiet fast tubular axis to two ends, and two ultrasonic transducers on the said quiet speed pipe are transceiver structure and alternately corresponding to each other transmitting and receiving element.
Ultrasonic transducer on the described quiet speed pipe is the transceiver structure; The ultrasonic transducer that is the transceiver structure on the said quiet speed pipe is arranged in quiet fast tubular axis to an end, is furnished with to the other end at quiet fast tubular axis to be used for reflecting the reflecting part from the ultrasonic transducer ultrasonic waves transmitted.
The invention has the beneficial effects as follows: in the time difference method supersonic flow quantity measuring method provided by the present invention; In the quiet speed pipe that gas to be measured freely is diffused into be communicated with when flowing through the pipeline section of measuring tube with this pipeline section; Freely spread because be; In quiet speed pipe, do not have pressure reduction like this, thereby the ultrasound wave that can in quiet speed pipe, directly measure is being surveyed the velocity of propagation C in the gas f,, can think the ultrasonic propagation velocity C that measurement calculates in quiet speed is managed because the environmental factor of quiet speed pipe and measuring tube such as gas composition, temperature, pressure etc. are all consistent fBe the velocity of propagation under the gas static state to be measured of ultrasound wave in measuring tube, avoid gas composition ultrasonic propagation velocity C fMeasure the influence when calculating, save the compensation that need be directed against each environmental factor and carry out and calculate, realize the self compensation of time difference method ultrasound wave survey gas flow, make to obtain ultrasonic propagation velocity C fast, accurately f, after carrying it into the corresponding calculated formula, can accurately record the flow of gas to be measured.Realize online detection in the time difference method supersonic flow quantity measuring method provided by the present invention, guarantee that gas and the gas to be measured in the measuring tube in the quiet speed pipe is under the same state all the time, improve the accuracy of measuring ultrasonic propagation velocity.
Time difference method supersonic flow amount detecting device provided by the present invention; Quiet speed in that the gas to be measured that on the pipeline section that is provided with the ultrasonic transducer group, is communicated with on the measuring tube in this pipeline section of confession freely spreads is managed; In quiet speed pipe, be furnished with the ultrasonic transducer that is used to measure ultrasonic propagation velocity; During use; Measure following current time and the adverse current time of ultrasound wave following current when propagating by being arranged in ultrasonic transducer group on the measuring tube; And measurement calculates the velocity of propagation of ultrasound wave in the gas to be measured of quiet speed pipe in quiet speed pipe, brings following current time, adverse current time and ultrasonic propagation velocity into calculate gas to be measured in the respective party formula flow velocity then, and then obtains gas flow to be measured.In the pick-up unit provided by the present invention; On measuring tube, be provided with quiet speed pipe; During measurement; Gas to be measured in the measuring tube freely is diffused in the quiet speed pipe; Environmental factor in factors such as residing environmental factor of quiet speed pipe such as gas composition, temperature, pressure and the measuring tube always, the measured ultrasonic propagation velocity that calculates is the velocity of propagation in the gas of ultrasound wave at measuring tube in quiet speed pipe, like this through quiet speed pipe directly the velocity of propagation of measurement ultrasound wave in gas to be measured eliminate the influence of factors such as gas composition, temperature, pressure; Realize the self compensation function, save the various compensation that to consider various environmental factors in the prior art and do and calculate.Pick-up unit structure provided by the present invention realizes the online detection to ultrasonic propagation velocity; Guarantee that gas and the gas to be measured in the measuring tube in the quiet speed pipe are under the same state all the time; Improve the accuracy of measuring, the measurement of being convenient to use the gas flow under the various environment.
Description of drawings
Fig. 1 is the structural representation of time difference method supersonic flow amount detecting device provided by the present invention.
Embodiment
A kind of embodiment of time difference method supersonic flow quantity measuring method, the detection method among this embodiment comprises the steps:
1., when gas stream to be measured is crossed measuring tube, measure the following current time t of ultrasound wave following current in pipeline section when propagating by the ultrasonic transducer group on the pipeline section that is arranged in measuring tube 1Adverse current time t when reaching the adverse current propagation 2Gas to be measured flow through measuring tube be furnished with the pipeline section of ultrasonic transducer group the time freely be diffused in the quiet speed pipe; Be furnished with in quiet speed pipe emission on this quiet speed pipe and receive hyperacoustic ultrasonic transducer; The layout that goes up ultrasonic transducer according to quiet speed pipe obtains the sound path that ultrasound wave is propagated in quiet speed pipe; By the emission of the ultrasonic transducer in the quiet speed pipe and receive ultrasound wave, can obtain ultrasonic propagation velocity C divided by the actual propagation time of ultrasound wave in quiet speed pipe by sound path to obtain the actual propagation time of ultrasound wave in sound path f
2., with t measured in the step 1 1, t 2, C fIn the hope of treating the flow velocity v of fluid measured in measuring tube, and then obtain treating the flow of fluid measured in the following equation of substitution,
Δt = S C f - v ′ - S C f + v ′ - - - ( 1 )
Δt=t 2-t 1 (2)
v′=vf(θ) (3)
Wherein, S is the sound path that ultrasound wave is propagated in measuring tube, and v ' then is the component velocity of flow velocity v on the ultrasonic propagation direction of fluid media (medium), and f (θ) is a trigonometric function, and S and f (θ) all obtain according to the layout of ultrasonic transducer group in the measuring tube.
A kind of method that the time difference method ultrasonic flow detects online detection ultrasonic propagation velocity that is used for also is provided in said method simultaneously, has comprised the steps:
1.,, the time difference method ultrasonic flow is communicated with quiet speed pipe on the used measuring tube in detecting; Make gas to be measured flow through measuring tube be furnished with the pipeline section of ultrasonic transducer group the time freely be diffused in the quiet speed pipe, be furnished with in quiet speed pipe emission on this quiet speed pipe and receive hyperacoustic ultrasonic transducer;
2., the layout that goes up ultrasonic transducer according to quiet speed pipe obtains the sound path that ultrasound wave is propagated in quiet speed pipe; By the emission of the ultrasonic transducer in the quiet speed pipe and receive ultrasound wave, can obtain ultrasonic propagation velocity C divided by the actual propagation time of ultrasound wave in quiet speed pipe by sound path to obtain the actual propagation time of ultrasound wave in sound path f
The layout of quiet speed pipe can for example can adopt following three kinds of distribution forms based on the actual conditions setting in above-mentioned two detection methods:
The layout 1 of the ultrasonic transducer on the quiet speed pipe is: the ultrasonic transducer on the said quiet speed pipe is furnished with two at quiet fast tubular axis to two ends, and one of them in two ultrasonic transducers on the said quiet speed pipe is radiated element, another is receiving element.
The layout 2 of the ultrasonic transducer on the quiet speed pipe is: the ultrasonic transducer on the said quiet speed pipe is furnished with two at quiet fast tubular axis to two ends, and two ultrasonic transducers on the said quiet speed pipe are transceiver structure and alternately corresponding to each other transmitting and receiving element.
The layout 3 of the ultrasonic transducer on the quiet speed pipe is: the ultrasonic transducer on the said quiet speed pipe is the transceiver structure; The ultrasonic transducer that is the transceiver structure on the said quiet speed pipe is arranged in quiet fast tubular axis to an end, is furnished with to the other end at quiet fast tubular axis to be used for reflecting the reflecting part from the ultrasonic transducer ultrasonic waves transmitted.
In above-mentioned layout of enumerating 1 and layout 2; Ultrasonic transducer on the quiet speed pipe all adopts the correlation structure; In other embodiments; Ultrasonic transducer on the quiet speed 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 speed pipe.
In addition, in above-mentioned detection method, obtain the time delay that the actual propagation time of ultrasound wave in quiet speed pipe was deducted in the metering circuit by radiated element and the travel-time between the receiving element of the ultrasound wave that measures in quiet speed pipe.
Above-mentioned time difference method supersonic flow quantity measuring method is applicable to gas discharge in mine pipeline and gas metering, also is applicable to the measurement of gas flow under other environment.
The device that is used to implement above-mentioned two kinds of methods below in conjunction with the accompanying drawing introduction.
As shown in Figure 1; A kind of embodiment that is used to implement the time difference method supersonic flow amount detecting device of time difference method supersonic flow quantity measuring method; Pick-up unit among this embodiment comprises measuring tube 2; In the ultrasonic transducer group that is furnished with the adverse current time when being used for measuring following current time and the adverse current of ultrasound wave when gas following current to be measured is propagated on the pipeline section of measuring tube 2; This ultrasonic transducer group comprises two transceivers and alternately corresponding to the ultrasonic transducer 1 that transmits and receives element, and the ultrasonic transducer 1 V-shaped reflection configuration of two transceivers is along on the axial arranged measuring tube of measuring tube here.Be fixed with the quiet speed pipe 3 that is connected and supplies the gas to be measured in this pipeline section freely to spread with pipeline section that measuring tube is provided with the ultrasonic transducer group on the described measuring tube 2; Quiet speed pipe 3 is connected on the measuring tube 2 through anemostat 5; And quiet speed pipe 3 is connected with the pipeline section that the ultrasonic transducer group is installed of measuring tube through anemostat; The anemostat here along quiet fast tubular axis to being furnished with two, and these two anemostats at a distance of nearer to prevent gas pulsation occurring in the quiet speed pipe.Be furnished with in quiet speed pipe emission on the quiet speed pipe 3 and receiving ultrasound wave to be used to measure the ultrasonic transducer 4 of ultrasonic propagation velocity.The layout of the ultrasonic transducer in the quiet speed pipe here is: the ultrasonic transducer 4 on the said quiet speed pipe is furnished with two at quiet fast tubular axis to two ends, and one of them in two ultrasonic transducers on the said quiet speed pipe is radiated element, another is receiving element.
Simultaneously; A kind of embodiment that the time difference method ultrasonic flow detects the device of online detection ultrasonic propagation velocity that is used for is also disclosed in Fig. 1; Device among this embodiment is connected in the quiet speed pipe 3 that is connected on the measuring tube 2 used in the detection of time difference method ultrasonic flow and with the pipeline section that is furnished with the ultrasonic transducer group of measuring tube and freely spreads for the gas to be measured that flows through in this pipeline section when comprising use; Quiet speed pipe 3 is connected on the measuring tube 2 through anemostat 5; And quiet speed pipe is connected with the pipeline section that the ultrasonic transducer group is installed of measuring tube through anemostat; The anemostat here along quiet fast tubular axis to being furnished with two, and these two anemostats at a distance of nearer to prevent gas pulsation occurring in the quiet speed pipe.Be furnished with in quiet speed pipe emission on the quiet speed pipe 3 and receiving ultrasound wave to be used to measure ultrasonic propagation velocity C fUltrasonic transducer 4; The layout of the ultrasonic transducer in the quiet speed pipe here is: the ultrasonic transducer on the said quiet speed pipe is furnished with two at quiet fast tubular axis to two ends, and one of them in two ultrasonic transducers on the said quiet speed pipe is radiated element, another is receiving element.
Among above-mentioned two embodiment, two ultrasonic transducers in the ultrasonic transducer group in the measuring tube are 45 ° of V-types to be arranged, in other embodiments, the V-type that also can be other angles is arranged.Perhaps adopt like other layout structures such as Z type or X types, as long as can record corresponding hyperacoustic following current time and adverse current time.Perhaps can also be on measuring tube be that the ultrasonic reflections position is furnished with the ultrasonic sensor as receiving element in the ultrasonic transducer of two V-shaped layouts over against side center position place; This form of on measuring tube, arranging three ultrasonic transducers can be eliminated whole ultrasonic ripple pick-up unit because of the time delay that self device is brought, and can farthest improve following current time and adverse current time measurement accuracy.
Among above-mentioned two embodiment; The V-shaped reflection configuration of two ultrasonic transducers in the ultrasonic transducer group in the measuring tube is arranged; In other embodiments, also can adopt the arrangement form that is the correlation structure that intersects with the measuring tube axioversion of the prior art, can not influence its measurement result.
Among above-mentioned two embodiment; The V-shaped reflection configuration of two ultrasonic transducers in the ultrasonic transducer group in the measuring tube is arranged; In other embodiments, also can adopt the arrangement form of four ultrasonic transducers of the X of being type two-channel layout of the prior art.Four ultrasonic transducers that are X type layout on the measuring tube are the transceiver structure; Because four ultrasonic transducers are formed two and are measured sound channel; Like this for each sound channel, as long as a radiated element and a receiving element are arranged, certainly; Four ultrasonic transducers can be separately radiated element or receiving element also, only otherwise following current time and the adverse current time of influence when measuring ultrasound wave and in the fluid of measuring tube, propagating get final product.
Among above-mentioned two embodiment; The layout of the ultrasonic transducer on the quiet speed pipe can also for: the ultrasonic transducer on the said quiet speed pipe is furnished with two at quiet fast tubular axis to two ends, and two ultrasonic transducers on the said quiet speed pipe are transceiver structure and alternately corresponding to each other transmitting and receiving element.
Perhaps adopt following layout: the ultrasonic transducer on the said quiet speed pipe is the transceiver structure; The ultrasonic transducer that is the transceiver structure on the said quiet speed pipe is arranged in quiet fast tubular axis to an end, is furnished with to the other end at quiet fast tubular axis to be used for reflecting the reflecting part from the ultrasonic transducer ultrasonic waves transmitted.
In the above-mentioned layout of enumerating; Ultrasonic transducer on the quiet speed pipe all adopts the correlation structure; In other embodiments; Ultrasonic transducer on the quiet speed 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 speed pipe.
Direct measurement when the method and apparatus of measurement ultrasonic propagation velocity provided by the present invention has realized that ultrasound wave is propagated in tested gas is guaranteed the accuracy of having demonstrate,proved the measured velocity of sound through quiet speed, measuring method and install simple and reliable.

Claims (9)

1. a time difference method supersonic flow quantity measuring method is characterized in that, comprises the steps:
1., when gas stream to be measured is crossed measuring tube, measure the following current time t of ultrasound wave following current in pipeline section when propagating by the ultrasonic transducer group on the pipeline section that is arranged in measuring tube 1Adverse current time t when reaching the adverse current propagation 2Gas to be measured flow through measuring tube be furnished with the pipeline section of ultrasonic transducer group the time freely be diffused in the quiet speed pipe; Be furnished with in quiet speed pipe emission on this quiet speed pipe and receive hyperacoustic ultrasonic transducer; The layout that goes up ultrasonic transducer according to quiet speed pipe obtains the sound path that ultrasound wave is propagated in quiet speed pipe; By the emission of the ultrasonic transducer in the quiet speed pipe and receive ultrasound wave, can obtain ultrasonic propagation velocity C divided by the actual propagation time of ultrasound wave in quiet speed pipe by sound path to obtain the actual propagation time of ultrasound wave in sound path f
2., with t measured in the step 1 1, t 2, C fIn the hope of treating the flow velocity v of fluid measured in measuring tube, and then obtain treating the flow of fluid measured in the following equation of substitution,
Δt = S C f - v ′ - S C f + v ′ - - - ( 1 )
Δt=t 2-t 1 (2)
v′=vf(θ) (3)
Wherein, S is the sound path that ultrasound wave is propagated in measuring tube, and v ' then is the component velocity of flow velocity v on the ultrasonic propagation direction of fluid media (medium), and f (θ) is a trigonometric function, and S and f (θ) all obtain according to the layout of ultrasonic transducer group in the measuring tube.
2. time difference method supersonic flow quantity measuring method according to claim 1; It is characterized in that; The layout of the ultrasonic transducer on the described quiet speed pipe is: the ultrasonic transducer on the said quiet speed pipe is furnished with two at quiet fast tubular axis to two ends, and one of them in two ultrasonic transducers on the said quiet speed pipe is radiated element, another is receiving element.
3. time difference method supersonic flow quantity measuring method according to claim 1; It is characterized in that; The layout of the ultrasonic transducer on the described quiet speed pipe is: the ultrasonic transducer on the said quiet speed pipe is furnished with two at quiet fast tubular axis to two ends, and two ultrasonic transducers on the said quiet speed pipe are transceiver structure and alternately corresponding to each other transmitting and receiving element.
4. time difference method supersonic flow quantity measuring method according to claim 1; It is characterized in that; The layout of the ultrasonic transducer on the described quiet speed pipe is: the ultrasonic transducer on the said quiet speed pipe is the transceiver structure; The ultrasonic transducer that is the transceiver structure on the said quiet speed pipe is arranged in quiet fast tubular axis to an end, is furnished with to the other end at quiet fast tubular axis to be used for reflecting the reflecting part from the ultrasonic transducer ultrasonic waves transmitted.
5. time difference method supersonic flow amount detecting device that is used to implement detection method as claimed in claim 1; Comprise measuring tube; In the ultrasonic transducer group that is furnished with the adverse current time when being used for measuring following current time and the adverse current of ultrasound wave when gas following current to be measured is propagated on the pipeline section of measuring tube; It is characterized in that; Be fixed with the quiet speed pipe that is connected and supplies the gas to be measured in this pipeline section freely to spread with pipeline section that measuring tube is provided with the ultrasonic transducer group on the described measuring tube, be furnished with in quiet speed pipe emission on the quiet speed pipe and receiving ultrasound wave to be used to measure the ultrasonic transducer of ultrasonic propagation velocity.
6. time difference method supersonic flow amount detecting device according to claim 5 is characterized in that, described quiet speed pipe is connected with measuring tube through anemostat, and said anemostat is connected with the pipeline section that described measuring tube is provided with the ultrasonic transducer group.
7. according to claim 5 or 6 described time difference method supersonic flow amount detecting devices; It is characterized in that; Ultrasonic transducer on the described quiet speed pipe is furnished with two at quiet fast tubular axis to two ends, and one of them in two ultrasonic transducers on the said quiet speed pipe is radiated element, another is receiving element.
8. according to claim 5 or 6 described time difference method supersonic flow amount detecting devices; It is characterized in that; Ultrasonic transducer on the described quiet speed pipe is furnished with two at quiet fast tubular axis to two ends, and two ultrasonic transducers on the said quiet speed pipe are transceiver structure and alternately corresponding to each other transmitting and receiving element.
9. according to claim 5 or 6 described time difference method supersonic flow amount detecting devices; It is characterized in that; Ultrasonic transducer on the described quiet speed pipe is the transceiver structure; The ultrasonic transducer that is the transceiver structure on the said quiet speed pipe is arranged in quiet fast tubular axis to an end, is furnished with to the other end at quiet fast tubular axis to be used for reflecting the reflecting part from the ultrasonic transducer ultrasonic waves transmitted.
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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
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CN113932866A (en) * 2021-12-17 2022-01-14 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
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