CN106052779A - Fluid flow detection technology based on ultrasonic interference method - Google Patents
Fluid flow detection technology based on ultrasonic interference method Download PDFInfo
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- CN106052779A CN106052779A CN201510183247.6A CN201510183247A CN106052779A CN 106052779 A CN106052779 A CN 106052779A CN 201510183247 A CN201510183247 A CN 201510183247A CN 106052779 A CN106052779 A CN 106052779A
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- 239000012530 fluid Substances 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000001514 detection method Methods 0.000 title claims abstract description 5
- 238000005259 measurement Methods 0.000 claims abstract description 14
- 230000000694 effects Effects 0.000 claims abstract description 8
- 230000005284 excitation Effects 0.000 claims abstract description 6
- 238000002604 ultrasonography Methods 0.000 claims description 45
- 239000000523 sample Substances 0.000 claims description 15
- 239000002131 composite material Substances 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 8
- 238000007792 addition Methods 0.000 claims description 4
- 238000000691 measurement method Methods 0.000 abstract 1
- 235000019687 Lamb Nutrition 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
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Abstract
The invention belongs to the field of fluid flow detection and especially relates to a fluid flow measurement method based on an ultrasonic interference phenomenon. The method is characterized in that two concurrent ultrasonic accesses (waveguide bars) are designed; under a specific excitation frequency, a length difference between the two accesses is made to be odd-number times half of an ultrasonic wave length (with a phase difference of 180 DEG); and signals of the two accesses are counted up, so that an excitation frequency component can be eliminated, a frequency component generated from Doppler effects is highlighted, and accurate flow measurement can be implemented.
Description
Technical field
The invention belongs to fluid flow detection field, particularly to a kind of measurement of fluid flow method based on ultrasound wave interferometric method.
Background technology
Ultrasonic Doppler Flowmeter has the feature of all ultrasonic flow measuring methods, and the change for factors such as temperature, pressure, viscosity is insensitive, and certainty of measurement is high, the fast response time to fluid-mixing.Ultrasonic Doppler flowmeter is applicable to measure the liquid containing certain reflecting medium, it is arranged on outside tested pipeline tube wall, need not contact detected fluid, and do not disturb the flowing of fluid, there is no null offset phenomenon, but up to the present, Ultrasonic Doppler Flowmeter remains a need for the most perfect, although the most existing a lot of products, but in certainty of measurement, still suffer from certain restriction.
Usual method is to use particulate matter reflection to produce twice Doppler effect to obtain doppler shift effect, but, the Lamb wave frequency that the ultrasound wave caused by Doppler effect causes with excitation ultrasound wave is the most close, and the energy of Lamb wave may be higher than the energy of echo tens times, reflection wave signal interference to collecting is the biggest, the signal waveform collected is the most undesirable, it is impossible to enough measurement accurately arrives fluid flow.
Summary of the invention
For solving the problem of conventional ultrasound low, this paper presents a kind of fluid flux measurement technology based on ultrasound wave interferometric method, fluid measurement precision is greatly improved；And our method is possible not only to detect for fluid flow, can also to gas.
The technical method that the present invention uses is:
The method designs two parallel and distancesInsignificant ultrasound wave pathWith(guided wave bar), in characteristic frequency bePower signal excitation under, normal ultrasound waves probe 1 can produce frequency and isUltrasound wave；When in pipe, the speed of fluid isTime, due to Doppler effect, frequency isUltrasound wave byTravel to effusion meter special-purpose ultrasonic pop one's head in 2 time, probe 2 receives frequency and isUltrasound wave and frequency beLamb wave, and mixed recharge exists、The amplitude at place is identical with phase place, makes pathWithLength difference equal to ultrasonic wavelength 1/2nd odd-multiple, i.e.(in formulaFor pathLength,For pathLength,Ultrasound wave wavelength in a fluid,For positive integer), order is through pathAfter signal be, through pathAfter signal be, so mixing ultrasound wave is respectively through pathAnd pathArrive、After, signalAnd signalMedium frequency isFractional phase differ 180 degree, the additions of two channel signals can eliminate frequencyComposition, prominent frequencyComposition, obtains the calculating formula of rate of flow of fluid(in formula:For timing direction as shown in drawings, in opposite direction with shown in accompanying drawing time negative,For ultrasound wave spread speed in a fluid,For ultrasound wave angle of incidence), if the cross-sectional area of pipe is, then the volume flow in pipe is:, can calculate and fluid measurement precision is greatly improved.
Accompanying drawing explanation
Accompanying drawing 1 is the schematic diagram of a kind of measurement of fluid flow method based on ultrasound wave interferometric method.
In accompanying drawing 1, normal ultrasound waves probe 1 is transmitting terminal, and effusion meter special-purpose ultrasonic probe 2 is receiving terminal, and effusion meter special-purpose ultrasonic probe 2 is made up of even a ultrasound wave path and common ultrasound probe,For ultrasonic emitting position,WithUltrasound wave path,For pathLength,For pathLength,For pathAnd pathBetween distance (The least, the most negligible),For ultrasound wave spread speed in a fluid,For ultrasound wave angle of incidence.
Detailed description of the invention
1 pair of patent of the present invention is described in detail below in conjunction with the accompanying drawings.
Normal ultrasound waves probe 1 is transmitting terminal, and effusion meter special-purpose ultrasonic probe 2 is receiving terminal, and effusion meter special-purpose ultrasonic probe 2 is made up of even a ultrasound wave path and common ultrasound probe,For ultrasonic emitting position,WithUltrasound wave path,For pathLength,For pathLength,For pathAnd pathBetween distance (The least, the most negligible),For ultrasound wave spread speed in a fluid,Ultrasound wave wavelength in path,For ultrasound wave angle of incidence.
Employing characteristic frequency isPower signal incentive probe 1, at rate of flow of fluid bePipeline in, ultrasound wave is by positionTravel to pop one's head in 2 time, probe and frequency can be received beUltrasound wave and frequency beLamb wave, its medium frequency isUltrasound wave caused by Doppler effect, frequency:
(1)
In probe 2, because positionAnd positionBetween distanceThe shortest, can ignore, it can be considered that in-positionAnd positionComposite ultraphonic ripple is the same, makes pathWithLength difference equal to ultrasonic wavelength 1/2nd odd-multiple, it may be assumed that
(2)
So composite ultraphonic ripple is respectively through pathAnd pathArrive、After, it is that two signals are about medium frequencyFractional phase differ 180 degree, the additions of two channel signals can eliminate driving frequencyComposition, prominent frequencyComposition, measures frequency, draw velocity formula according to formula (1):
(3)
If the cross-sectional area of pipe is, then the volume flow in pipe is:
(4)
The method designs two parallel and distancesInsignificant ultrasound wave pathWith(guided wave bar), in characteristic frequency bePower signal excitation under, ultrasound wave at flow velocity isPipe in owing to Doppler effect can produce frequency beWithComposite ultraphonic ripple, composite ultraphonic ripple exists、The amplitude at place is identical with phase place, makes the length difference of the two paths odd-multiple equal to 1/2nd of ultrasonic wavelength, and such composite ultraphonic ripple is respectively through pathAnd pathArrive、After, two channel ultrasonic signal intermediate frequency rates areSignal phase differ 180 degree, the additions of two channel signals can eliminate driving frequencyComposition, prominent frequency isComposition, according to the calculating formula of rate of flow of fluid(in formula:For ultrasound wave spread speed in a fluid,For ultrasound wave angle of incidence), fluid measurement precision can be greatly improved.
Claims (2)
1. a measurement of fluid flow method based on ultrasound wave interferometric method, it is characterised in that:
The method designs two parallel and distancesInsignificant ultrasound wave pathWith(guided wave bar), in characteristic frequency bePower signal excitation under, normal ultrasound waves probe 1 can produce frequency and isUltrasound wave；When in pipe, the speed of fluid isTime, due to Doppler effect, frequency isUltrasound wave byTravel to effusion meter special-purpose ultrasonic pop one's head in 2 time, probe 2 receives frequency and isWithComposite ultraphonic ripple, and composite ultraphonic ripple exists、The amplitude at place is identical with phase place, makes pathWithLength difference equal to ultrasonic wavelength 1/2nd odd-multiple, i.e.(in formulaFor pathLength,For pathLength,Ultrasound wave wavelength in path,For positive integer), order is through pathAfter signal be, through pathAfter signal be, such composite ultraphonic ripple is respectively through pathAnd pathArrive、After, signalAnd signalMedium frequency isFractional phase differ 180 degree, the additions of two channel signals can eliminate driving frequencyComposition, prominent required frequency isComposition, obtains the calculating formula of rate of flow of fluid(in formula:For timing direction as shown in drawings, in opposite direction with shown in accompanying drawing time negative,For ultrasound wave spread speed in a fluid,For ultrasound wave angle of incidence), if the cross-sectional area of pipe is, then the volume flow in pipe is:, fluid measurement precision can be greatly improved.
2. according to a kind of based on ultrasound wave interferometric method the measurement of fluid flow method described in claim 1., it is characterised in that: a kind of based on ultrasonic
The measurement of fluid flow method of wave interference method is possible not only to detect for fluid flow, can also flow detection to gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510183247.6A CN106052779A (en) | 2015-04-17 | 2015-04-17 | Fluid flow detection technology based on ultrasonic interference method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510183247.6A CN106052779A (en) | 2015-04-17 | 2015-04-17 | Fluid flow detection technology based on ultrasonic interference method |
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| CN106052779A true CN106052779A (en) | 2016-10-26 |
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| CN201510183247.6A Pending CN106052779A (en) | 2015-04-17 | 2015-04-17 | Fluid flow detection technology based on ultrasonic interference method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109350780A (en) * | 2018-11-29 | 2019-02-19 | 刘铁楠 | A kind of drainage monitoring device |
| CN111380584A (en) * | 2020-04-16 | 2020-07-07 | 上海迅音科技有限公司 | Ultrasonic flowmeter |
-
2015
- 2015-04-17 CN CN201510183247.6A patent/CN106052779A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109350780A (en) * | 2018-11-29 | 2019-02-19 | 刘铁楠 | A kind of drainage monitoring device |
| CN111380584A (en) * | 2020-04-16 | 2020-07-07 | 上海迅音科技有限公司 | Ultrasonic flowmeter |
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Application publication date: 20161026 |