CN100485325C - Double-channel vortex street flowmeter system - Google Patents
Double-channel vortex street flowmeter system Download PDFInfo
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- CN100485325C CN100485325C CNB2007100427492A CN200710042749A CN100485325C CN 100485325 C CN100485325 C CN 100485325C CN B2007100427492 A CNB2007100427492 A CN B2007100427492A CN 200710042749 A CN200710042749 A CN 200710042749A CN 100485325 C CN100485325 C CN 100485325C
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Abstract
A vortex street flow meter system with two channels is prepared as connecting signal separately to a signal adaptive reshaper and a signal threshold reshaper to separately generate out two paths of pulse frequency signals corresponding to flow speed and then inputting them to a signal integrated processor for processing signals in two-path signal processing channel of low flow speed signal and high flow speed signal.
Description
Technical field
The present invention relates to a kind of flowmeter system, particularly a kind of double-channel vortex flowmeter system that adopts the two paths of signals treatment channel.
Background technology
Vortex shedding flow meter is a principle of utilizing Kalman's vortex street in the fluid mechanics, the characteristic that is directly proportional with flow velocity V in the certain flow rate scope according to the frequency F of sensor output signal X adopts survey sensor output signal frequency F=K * V to measure rate of flow of fluid V when having determined that sensor signal becomes after sending COEFFICIENT K.The direct corresponding relation of sort signal frequency and flow velocity has the range ability of 100:1 in theory.But simultaneously, the pulsation amplitude U of general stress-type sensor output signal again with signal frequency F
2Be directly proportional, promptly the pulsation amplitude of sensor output signal is bigger when flow velocity is high slightly, corresponding frequency measurement ratio is easier to, and the pulsation amplitude of signal will reduce greatly when flow velocity is low slightly, and noises such as high frequency interference in the signal and frequency wobbles make the vortex street frequency in the detection signal become very difficult.
At present, the vortex flowmeter system of simple technique mainly adopts fixedly the window comparator method of amplifier and fixed threshold that signal frequency is caught.The range ability of this vortex flowmeter system is generally at 10:1.
The signal processing method of vortex shedding flow meter mainly contains following several: the one, and adopt the method for the bandpass filter the adjusted centre frequency of following the tracks of the vortex street frequency to improve to hanging down the processing horizontal of flow velocity signal, mainly contain United States Patent (USP) 5372046,5429001 and 5576497 etc., realize bringing difficulty because the contradiction between correctness, rapidity and the technical complexity followed the tracks of all makes; The 2nd, the reference numerals frequency spectrum analysis method is estimated the signal frequency of low amplitude value, the Chinese patent 99101209.7 of useful pure digi-tal spectral method, the bandpass filter the adjusted method of useful digitized spectra analysis and tracking frequencies combine as U.S. Pat 6480812B1, U.S. Pat 6212975B1 and European patent 645258 etc., these class methods mainly are to have improved the correctness problem that first method medium frequency is followed the tracks of with technical complexity; The 3rd, the method that adopts the dynamic amplitude versus frequency characte turning point Z that adjusts step low-pass that signal is amplified on a 40dB/dec line, as Chinese patent 200610029218.5, this method both can effectively be amplified hanging down flow velocity signal, had avoided again the amplification of frequency wobbles has also been suppressed high frequency noise preferably.But this method mainly is applicable to signal pulsation amplitude U and signal frequency F when flow velocity is low
2The situation that is directly proportional.
Summary of the invention
The purpose of this invention is to provide a kind of double-channel vortex flowmeter system, promptly after the coupling of sensor output signal is amplified, signal is divided into the two paths of signals treatment channel of low flow velocity signal of special disposal and special disposal high flow rate signal.Can under low power consumption and low cost, realize accurate measurement to the height flow velocity.
For achieving the above object, design of the present invention is: to signal pulsation amplitude U and signal frequency F
2The low flow velocity signal that is directly proportional adopts the signal processing channel of Chinese patent 200610029218.5 methods, adopts the fixedly signal processing channel of amplifier and fixed threshold method and signal pulsation amplitude U is satisfied big flow velocity signal greater than big threshold value.The two paths of signals treatment channel has been exported the pulse signal of following frequency F at last.And from two pulse signals, draw vortex street frequency F and the rate of flow of fluid V of height under the flow velocity by a signal synthesis processor.
According to the design of foregoing invention, the present invention by the following technical solutions:
A kind of double-channel vortex flowmeter system comprises that one has change to send COEFFICIENT K
1Sensor at rate of flow of fluid V greater than V
SThe time ripple frequency F=K arranged
1The output signal X of * V
1, K
1Be by the confirmable coefficient of experiment; One has signal amplification factor K
2The Signal Matching amplifier with signal X
1Be converted to signal X
2=K
2* X
1, signal X
2Comprised signal X
1Ripple frequency F, at signal X
2Pulsation amplitude U
2When unrestricted, signal X
2Pulsation amplitude U
2=K
2* M
2* F
2, M
2Be the coefficient relevant with fluid density; It is characterized in that signal X
2Be connected respectively to a signal adaptive reshaper and signal threshold value reshaper, the amplitude versus frequency characte turning point Z that the signal adaptive reshaper is adjusted signal Processing automatically makes signal X
2The pulsating wave of middle ripple frequency F is shaped as pulse signal X
3Output; Signal threshold value reshaper (4) has signal amplification factor K
4With threshold value U
M, when rate of flow of fluid V is big, signal X
2The pulsation amplitude U of middle ripple frequency F
2Greater than threshold value U
N=U
M/ K
4And be shaped as pulse signal X
4Output, i.e. signal X
2Produce two-way pulsed frequency and the corresponding signal X of rate of flow of fluid V respectively through signal adaptive reshaper and signal threshold value reshaper
3With signal X
4, input to a signal synthesis processor then.
At above-mentioned double-channel vortex flowmeter system, described signal adaptive reshaper by one by numeral mouthful B
3Dynamically arrange the low-pass filter of amplitude versus frequency characte turning point Z and one with A/D conversion mouthful and numeral mouthful B
4The signal processor that is connected with low-pass filter is formed; Signal X
2The input low-pass filter, low-pass filter output signal X
23To the A/D conversion mouth of signal processor, signal processor is from an A/D conversion mouthful acquired signal X
23, from numeral mouthful B
4Output data D
4Adjust the amplitude versus frequency characte turning point Z of low-pass filter, make the signal X of low-pass filter output
23The pulsating wave of middle ripple frequency F is shaped as pulse signal X by signal processor
3And signal processor is at a signal port A
3Output pulse signal X
3
At above-mentioned double-channel vortex flowmeter system, a described signal synthesis processor is at signal port A
1With signal port A
2Import described signal X respectively
3With signal X
4, and with unit interval T detection signal X
3With signal X
4Pairing umber of pulse N
3With umber of pulse N
4As umber of pulse N
4Be not less than umber of pulse N
3The time, use F=N
4/ T is as the vortex street ripple frequency and with V=N
4/ T/K
1As rate of flow of fluid; As umber of pulse N
4Less than umber of pulse N
3The time, use F=N
3/ T is as the vortex street ripple frequency and with V=N
3/ T/K
1As rate of flow of fluid, when V less than V
SThe time think V=0; The signal synthesis processor is by numeral mouthful B
3Output shows vortex street ripple frequency F and rate of flow of fluid V.
At above-mentioned double-channel vortex flowmeter system, described signal processor is change a mouthful acquired signal X from A/D
23Pulsation amplitude U
23Output data D with correspondence
4By numeral mouthful B of signal processor
1Output to the numeral mouthful B of signal synthesis processor
2, changing system signal amplification coefficient K
2When value was come the matching system signal amplitude, the signal synthesis processor was by numeral mouthful B
3Output shows from numeral mouthful B
2Signal X
23Amplitude U
23Data D with correspondence
4
Above-mentioned threshold value reshaper is K by a signal amplification factor
4The output terminal of amplifier to connect a threshold value be U
MThe input end of Schmidt trigger constitute.
The present invention compared with prior art, have following conspicuous outstanding substantive distinguishing features and remarkable advantage: when rate of flow of fluid is low, adopt Chinese patent 200610029218.5 signal processing methods, not only will hang down the effective amplification of flow velocity signal but also avoided the amplification of frequency wobbles has also been suppressed high frequency noise preferably; When big rate of flow of fluid, directly adopted the ripe fixedly amplifier and the signal processing method of fixed threshold, can accurately catch the vortex street frequency signal simply and effectively.The double-channel vortex flowmeter system of Xing Chenging can be realized the accurate measurement to the height flow velocity under low power consumption and low cost like this.
Description of drawings
Fig. 1 is one embodiment of the present of invention system architecture theory diagram.
Embodiment
After now embodiments of the invention being described in.
Be a double-channel vortex flowmeter system structural principle block diagram shown in Fig. 1, one has change to send COEFFICIENT K
1Sensor 1 at rate of flow of fluid V greater than V
SThe time output ripple signal X
1, V
SFor, signal X
1Ripple frequency F=K
1* V; One has signal amplification factor K
2 Signal Matching amplifier 2 with signal X
1Be converted to signal X
2=K
2* X
1, signal X
2Comprised signal X
1Ripple frequency F, at signal X
2Pulsation amplitude U
2When unrestricted, signal X
2Pulsation amplitude U
2=K
2* M
2* F
2, M
2Be the coefficient relevant with fluid density; It is characterized in that signal X
2Be connected respectively to a signal adaptive reshaper 3 and signal threshold value reshaper 4, the amplitude versus frequency characte turning point Z that signal adaptive reshaper 3 is adjusted signal Processing automatically makes signal X
2The pulsating wave of middle ripple frequency F is shaped as pulse signal X
3Output; Signal threshold value reshaper 4 has signal amplification factor K
4With threshold value U
M, when rate of flow of fluid V is big, signal X
2The pulsation amplitude U of middle ripple frequency F
2Greater than threshold value U
N=U
M/ K
4And be shaped as pulse signal X
4Output, i.e. signal X
2Produce two-way pulsed frequency and the corresponding signal X of rate of flow of fluid V respectively through signal adaptive reshaper 3 and signal threshold value reshaper 4
3With signal X
4, input to signal synthesis processor 5 then.
Signal adaptive reshaper 3 in the native system by one by numeral mouthful B
3Dynamically arrange the low-pass filter 3.1 of amplitude versus frequency characte turning point Z and one with A/D conversion mouthful and numeral mouthful B
4The signal processor 3.2 that is connected with low-pass filter 3.1 is formed; Signal X
2Input low-pass filter 3.1, low-pass filter 3.1 output signal X
23To the A/D conversion mouth of signal processor 3.2, signal processor 3.2 is from an A/D conversion mouthful acquired signal X
23, from numeral mouthful B
4Output data D
4Adjust the amplitude versus frequency characte turning point Z of low-pass filter 3.1, make the signal X of low-pass filter 3.1 outputs
23The pulsating wave of middle ripple frequency F is shaped as pulse signal X by signal processor 3.2
3And signal processor 3.2 is at a signal port A
3Output pulse signal X
3
Signal threshold value reshaper 4 in the native system is K by a signal amplification factor
4Amplifier 4.1 and one threshold value U is arranged
MSchmidt trigger 4.2 form signal X
2Input amplifier 4.1, amplifier 4.1 output signal X
24=K
4* X
2, signal X
24Be input to one threshold value U is arranged
MSchmidt trigger 4.2, as signal X
24The pulsation amplitude greater than threshold value U
MThe time, Schmidt trigger 4.2 output pulse signal X
4
Signal processor 3.2 in the native system is change a mouthful acquired signal X from A/D
23Pulsation amplitude U
23Output data D with correspondence
4By 3.2 1 numeral mouthful B of signal processor
1Output to the numeral mouthful B of signal synthesis processor 5
2, changing system signal amplification coefficient K
2When value was come the matching system signal amplitude, signal synthesis processor 5 was by numeral mouthful B
3Output shows from numeral mouthful B
2Signal X
23Amplitude U
23Data D with correspondence
4
Above-mentioned signal threshold value reshaper 4 is K by a signal amplification factor
4The output terminal of amplifier 4.1 to connect a threshold value be U
MThe input end of Schmidt trigger 4.2 constitute.
Claims (3)
1. a double-channel vortex flowmeter system comprises that one has change to send COEFFICIENT K
1Sensor (1) at rate of flow of fluid V greater than V
sThe time ripple frequency F=K arranged
1The output signal X of * V
1, K
1Be by the confirmable coefficient of experiment; One has signal amplification factor K
2Signal Matching amplifier (2) with signal X
1Be converted to signal X
2=K
2* X
1, signal X
2Comprised signal X
1Ripple frequency F, at signal X
2Pulsation amplitude U
2When unrestricted, signal X
2Pulsation amplitude U
2=K
2* M
2* F
2, M
2Be the coefficient relevant with fluid density; It is characterized in that signal X
2Be connected respectively to a signal adaptive reshaper (3) and signal threshold value reshaper (4), the amplitude versus frequency characte turning point Z that signal adaptive reshaper (3) is adjusted signal Processing automatically makes signal X
2The pulsating wave of middle ripple frequency F is shaped as pulse signal X
3Output; Signal threshold value reshaper (4) has signal amplification factor K
4With threshold value U
M, when rate of flow of fluid V is big, signal X
2The pulsation amplitude U of middle ripple frequency F
2Greater than threshold value U
N=U
M/ K
4And be shaped as pulse signal X
4Output, i.e. signal X
2Produce two-way pulsed frequency and the corresponding signal X of rate of flow of fluid V respectively through signal adaptive reshaper (3) and signal threshold value reshaper (4)
3With signal X
4, input to a signal synthesis processor (5) then;
Described signal adaptive reshaper (3) by one by numeral mouthful B
3Dynamically arrange the low-pass filter (3.1) of amplitude versus frequency characte turning point Z and one with A/D conversion mouthful and numeral mouthful B
4The signal processor (3.2) that is connected with low-pass filter (3.1) is formed; Signal X
2Input low-pass filter (3.1), low-pass filter (3.1) output signal X
23To the A/D conversion mouth of signal processor (3.2), signal processor (3.2) is from an A/D conversion mouthful acquired signal X
23, from numeral mouthful B
4Output data D
4Adjust the amplitude versus frequency characte turning point Z of low-pass filter (3.1), make the signal X of low-pass filter (3.1) output
23The pulsating wave of middle ripple frequency F is shaped as pulse signal X by signal processor (3.2)
3And signal processor (3.2) is at a signal port A
3Output pulse signal X
3
Described signal synthesis processor (5) is at signal port A
1With signal port A
2Import described signal X respectively
3With signal X
4, and with unit interval T detection signal X
3With signal X
4Pairing umber of pulse N
3With umber of pulse N
4As umber of pulse N
4Be not less than umber of pulse N
3The time, use F=N
4/ T is as the vortex street ripple frequency and with V=N
4/ T/K
1As rate of flow of fluid; As umber of pulse N
4Less than umber of pulse N
3The time, use F=N
3/ T is as the vortex street ripple frequency and with V=N
3/ T/K
1As rate of flow of fluid, when V less than V
sThe time think V=0; Signal synthesis processor (5) shows vortex street ripple frequency F and rate of flow of fluid V by numeral mouthful B3 output.
2. double-channel vortex flowmeter system according to claim 1 is characterized in that described signal processor (3.2) is change a mouthful acquired signal X from A/D
23Pulsation amplitude U
23Output data D with correspondence
4By (3.2) numeral mouthful B of signal processor
1Output to the numeral mouthful B of signal synthesis processor (5)
2, changing system signal amplification coefficient K
2When value was come the matching system signal amplitude, signal synthesis processor (5) was by numeral mouthful B
3Output shows from numeral mouthful B
2Signal X
23Amplitude U
23Data D with correspondence
4
3. double-channel vortex flowmeter system according to claim 1 is characterized in that described signal threshold value reshaper (4) is K by a signal amplification factor
4The output terminal of amplifier (4.1) to connect a threshold value be U
MThe input end of Schmidt trigger (4.2) constitute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100427492A CN100485325C (en) | 2007-06-26 | 2007-06-26 | Double-channel vortex street flowmeter system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100427492A CN100485325C (en) | 2007-06-26 | 2007-06-26 | Double-channel vortex street flowmeter system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101074884A CN101074884A (en) | 2007-11-21 |
| CN100485325C true CN100485325C (en) | 2009-05-06 |
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ID=38976069
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|---|---|---|---|
| CNB2007100427492A Expired - Fee Related CN100485325C (en) | 2007-06-26 | 2007-06-26 | Double-channel vortex street flowmeter system |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102466500B (en) * | 2010-11-19 | 2013-06-19 | 中国电子科技集团公司第五十研究所 | Device and method for detecting and determining output pulses of pulse type vortex shedding flowmeter |
| CN102183274B (en) * | 2011-05-17 | 2012-05-23 | 重庆梅安森科技股份有限公司 | Wide-range double-vortex flowmeter |
| CN102322904B (en) * | 2011-06-11 | 2012-11-07 | 杭州电子科技大学 | Vortex shedding flow meter based on self-adaptive fast Fourier transformation |
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| CN101074884A (en) | 2007-11-21 |
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Assignee: Zhejiang Diyuan Instrument Co., Ltd. Assignor: Shanghai University Contract record no.: 2012310000022 Denomination of invention: Double-channel vortex flowmeter system Granted publication date: 20090506 License type: Exclusive License Open date: 20071121 Record date: 20120309 |
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Granted publication date: 20090506 Termination date: 20180626 |
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