CN104316119A - Ultrasonic measuring method and ultrasonic measuring device for double acoustic path gas flow - Google Patents
Ultrasonic measuring method and ultrasonic measuring device for double acoustic path gas flow Download PDFInfo
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- CN104316119A CN104316119A CN201410360996.7A CN201410360996A CN104316119A CN 104316119 A CN104316119 A CN 104316119A CN 201410360996 A CN201410360996 A CN 201410360996A CN 104316119 A CN104316119 A CN 104316119A
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Abstract
The invention relates to an ultrasonic measuring method and an ultrasonic measuring device for double acoustic path gas flow. Two pairs of energy transducers are adopted for respectively measuring the propagation time, perpendicular to the gas flow direction, of ultrasonic waves as well as the counter flow propagation time and the downstream propagation time of the ultrasonic waves, obtaining the actual acoustic speed of the ultrasonic eaves in a gas medium and finally obtaining the gas flow. The measuring device comprises a singlechip microcomputer unit, a time measuring unit, a driving unit, a signal conditioning unit and the two pairs of energy transducers arranged on a pipeline; one pair of energy transducers is symmetrically arranged by taking a pipeline axis as a symmetric axis; the other pair of energy transducers is respectively arranged on the upstream side and the downstream side of the pipeline; the singlechip microcomputer unit is connected with the driving unit through the time measuring unit; the driving unit is respectively connected with the two pairs of energy transducers; three energy transducers are respectively connected with the time measuring unit through the signal conditioning unit. According to the ultrasonic measuring method and the ultrasonic measuring device disclosed by the invention, the influence of the temperature, the pressure, the humidity, components and other factors on a measuring value of gas flow is eliminated, and the obtained gas flow value is high in accuracy and is wide in application range.
Description
Technical field
The present invention relates to detection of gas flow rate field, particularly relate to a kind of gas density of eliminating to the alliteration road gas flow ultrasonic measurement method of the impact of gas flow measurement and measurement mechanism thereof.
Background technology
In recent years, along with sensor technology and the intelligentized development of instrumental technique, utilize the technical development of ultrasonic pulse measurement fluid flow very fast.Based on different principle, the various forms of ultrasonic flow meters being applicable to different occasion are widely applied.According to the difference of principle of work, ultrasonic flow meter can be divided into doppler type ultrasonic flowmeter and transit-time ultrasonic flow meter.Most widely used is at present transit-time ultrasonic flow meter, and it generally realizes measuring by installation a pair transducer, is mainly used to measure clean fluid flow.But be subject to temperature, pressure, humidity due to gas density and organize the impact of grading factors, make the velocity of propagation of ultrasound wave in gas unstable, cause the adaptability of current ultrasonic flow rate measurement amount gas flow to be restricted, cause the measurement result of gas flow not accurate enough.
Summary of the invention
The measurement result that the present invention mainly solves original ultrasonic flow meter is subject to gas temperature, pressure, humidity and organizes the impact of grading factors, causes the technical matters that the measurement result of gas flow is not accurate enough; A kind of alliteration road gas flow ultrasonic measurement method and measurement mechanism thereof are provided, which obviate the impact of gas temperature, pressure, humidity and group grading factors, thus improve the accuracy of gas flow measurement.
Above-mentioned technical matters of the present invention is mainly solved by following technical proposals: alliteration road of the present invention gas flow ultrasonic measurement method is: on the pipeline of gas flow warp, be provided with the first transducer, the second transducer, the 3rd transducer and the 4th transducer, first transducer and the second transducer with the axis of described pipeline for axis of symmetry is symmetrical arranged, 4th transducer and the 3rd transducer are located at upstream side and the downstream of described pipeline respectively, and the line of the 3rd transducer and the 4th transducer and the axes intersect of described pipeline form angle theta;
Measure the travel-time T of ultrasound wave between the first transducer and the second transducer, obtaining the velocity of propagation of ultrasound wave in described gas is
C＝D/T，①
Wherein D is the diameter of described pipeline;
Measure ultrasound wave from the 4th transducer to the downstream propagation times t1 of the 3rd transducer, measure ultrasound wave from the 3rd transducer to the adverse current travel-time t2 of the 4th transducer, obtain Δ T=t2-t1, and Δ T=2LVCos θ/C
2, 2.
Wherein L is the wire length between the 3rd transducer and the 4th transducer, and V is the flow velocity of described gas;
1. V=Δ TD and is 2. obtained by formula
2/ 2LT
2cos θ, the flow finally obtaining described gas is
The technical program is by measuring the velocity of sound of ultrasound wave in gas medium, thus the gas density eliminated in different temperatures, pressure, humidity or component situation is on the impact of gas flow measurement, improve the accuracy of gas flow measurement, there is applicability widely.
Alliteration road of the present invention gas flow ultrasonic device for measuring, comprise single machine unit, time measuring unit, driver element and signal condition unit and the first described transducer, second transducer, 3rd transducer and the 4th transducer, first transducer, second transducer, 3rd transducer and the 4th transducer are located on the pipeline of gas flow warp respectively, first transducer and the second transducer with the axis of described pipeline for axis of symmetry is symmetrical arranged, 4th transducer and the 3rd transducer are located at upstream side and the downstream of described pipeline respectively, and the axes intersect of the line of the 3rd transducer and the 4th transducer and described pipeline forms angle theta, described single machine unit is connected with time measuring unit, the output terminal of time measuring unit is connected with the input end of driver element, the output terminal of driver element respectively with the first described transducer, 3rd transducer and the 4th transducer are connected, the second described transducer, 3rd transducer and the 4th transducer are connected with the input end of described signal condition unit again respectively, the output terminal of signal condition unit is connected with the input end of described time measuring unit respectively.Angle theta is acute angle, generally between 30 ° ~ 60 °.The line of the first transducer and the second transducer and the axes normal of pipeline.Time measuring unit, by the control of single machine unit, sends control signal to driver element, makes driver element send respective drive signal to the first transducer, the 3rd transducer and the 4th transducer.After first transducer is driven, launch ultrasound wave, the second receive MUT is to ultrasound wave and convert voltage signal to, through signal condition cell processing, flow to time measuring unit again, obtain the travel-time T of ultrasound wave between the first transducer and the second transducer by time measuring unit.After 3rd transducer is driven, launch ultrasound wave, 4th receive MUT is to ultrasound wave and convert voltage signal to, through signal condition cell processing, flow to time measuring unit again, obtain ultrasound wave from the 3rd transducer to the adverse current travel-time t2 of the 4th transducer by time measuring unit, in like manner obtain ultrasound wave from the 4th transducer to the downstream propagation times t1 of the 3rd transducer by time measuring unit.Downstream propagation times t1, adverse current travel-time t2 and travel-time T are all flowed to single machine unit by time measuring unit, through process and the calculating of single machine unit, finally obtain gas flow values, can show by liquor charging crystal display screen, also can teletransmission to rear end equipment, as monitor terminal.This gas flow values eliminates the impact on gas density of temperature, pressure, humidity or component, and therefore measurement accuracy is high, has applicability widely.
As preferably, described alliteration road gas flow ultrasonic device for measuring, comprise the first multiway analog switch, the second multiway analog switch, described signal condition unit comprises the first signal condition unit and secondary signal conditioning unit, and the first described multiway analog switch and the control end of the second multiway analog switch are connected with described single machine unit respectively; First output terminal of described driver element is connected with the common port of the first multiway analog switch, the double switch incoming end of the first multiway analog switch is connected with the first described transducer and the 3rd transducer respectively, the common port of the first multiway analog switch is connected with the input end of the first described signal condition unit again, and the output terminal of the first signal condition unit is connected with the first input end of described time measuring unit; Second output terminal of described driver element is connected with the common port of the second multiway analog switch, the double switch incoming end of the second multiway analog switch is connected with the second described transducer and the 4th transducer respectively, the common port of the second multiway analog switch is connected with the input end of described secondary signal conditioning unit again, and the output terminal of secondary signal conditioning unit is connected with the second input end of described time measuring unit.Which gating of the first multiway analog switch is controlled, i.e. gating first transducer or the 3rd transducer controls by single machine unit by single machine unit; Which gating of the second multiway analog switch is controlled, i.e. gating second transducer or the 4th transducer controls by single machine unit by single machine unit.It is convenient to control, and switches rapidly.3rd receive MUT to ultrasonic signal after the first signal condition cell processing, flow to time measuring unit again, the second transducer and the 4th receive MUT to ultrasonic signal after the process of secondary signal conditioning unit, flow to time measuring unit again.Circuit structure is ingenious and compact, and intelligence degree is high.
As preferably, described time measuring unit comprises time measurement chip U2, and time measurement chip U2 adopts GP22 time measurement chip; Described driver element comprises driving chip U3, and driving chip U3 adopts ULN2803 driving chip; The first described multiway analog switch comprises multiway analog switch chip U4, and the second described multiway analog switch comprises multiway analog switch chip U5, and multiway analog switch chip U4 and multiway analog switch chip U5 all adopts CD74HC4051 switch chip; The fire1 pin of time measurement chip U2 is connected with the 1B pin of driving chip U3, the 1C pin of driving chip U3 is connected with the A pin of multiway analog switch chip U4, the A0 pin of multiway analog switch chip U4 and A1 pin are connected with the first described transducer and the 3rd transducer respectively, the A pin of multiway analog switch chip U4 is connected with the input end of the first described signal condition unit, the output terminal of the first signal condition unit is connected with the stop1 pin of time measurement chip U2, and the S0 pin of multiway analog switch chip U4, S1 pin and S2 pin are connected with described single machine unit respectively; The gire2 pin of time measurement chip U2 is connected with the 2B pin of driving chip U3, the 2C pin of driving chip U3 is connected with the A pin of multiway analog switch chip U5, the A0 pin of multiway analog switch chip U5 and A1 pin are connected with the second described transducer and the 4th transducer respectively, the A pin of multiway analog switch chip U5 is connected with the input end of described secondary signal conditioning unit, the output terminal of secondary signal conditioning unit is connected with the stop2 pin of time measurement chip U2, and the S0 pin of multiway analog switch chip U5, S1 pin and S2 pin are connected with described single machine unit respectively.Circuit is simple, and it is convenient to realize, and reliability is high.
As preferably, the first described signal condition unit comprises comparer U6 and rejection gate U7, described secondary signal conditioning unit comprises comparer U8 and rejection gate U9, comparer U6 and comparer U8 all adopts TLV3502 comparer, and rejection gate U7 and rejection gate U8 all adopts SN74LVC1G02 rejection gate; The A foot meridian capacitor C1 of described multiway analog switch chip U4 is connected with 2 pin of comparer U6 and 3 pin, 1 pin of comparer U6 connects 3V voltage, 4 pin of comparer U6 connect 1V voltage, 8 pin of comparer U6 meet voltage VCC, the 5 pin ground connection of comparer U6,6 pin of comparer U6 and 7 pin are connected with 2 pin of rejection gate U7 and 1 pin respectively, the 3 pin ground connection of rejection gate U7,5 pin of rejection gate U7 connect 3V voltage, and 4 pin of rejection gate U7 are connected with the stop1 pin of described time measurement chip U2; The A foot meridian capacitor C2 of described multiway analog switch chip U5 is connected with 2 pin of comparer U8 and 3 pin, 1 pin of comparer U8 connects 3V voltage, 4 pin of comparer U8 connect 1V voltage, 8 pin of comparer U8 meet voltage VCC, the 5 pin ground connection of comparer U8,6 pin of comparer U8 and 7 pin are connected with 2 pin of rejection gate U9 and 1 pin respectively, the 3 pin ground connection of rejection gate U9,5 pin of rejection gate U9 connect 3V voltage, and 4 pin of rejection gate U9 are connected with the stop2 pin of described time measurement chip U2.Electric capacity C1 and comparer U6, rejection gate U7 form window comparator and are used for elimination noise, and electric capacity C2 and comparer U8, rejection gate U9 form window comparator and be used for elimination noise.Reduce interference, improve the accuracy of gas flow measurement.
As preferably, described single machine unit comprises single-chip microcomputer U1, single-chip microcomputer U1 adopts MSP430F4351 single-chip microcomputer, the P2.2 pin of single-chip microcomputer U1, P2.3 pin and P2.4 pin respectively with the S2 pin of multiway analog switch chip U4, S1 pin and S0 pin are connected, the P2.5 pin of single-chip microcomputer U1, P2.6 pin and P2.7 pin respectively with the S2 pin of multiway analog switch chip U5, S1 pin and S0 pin are connected, the P1.4 pin of single-chip microcomputer U1, P1.5 pin, P1.6 pin and P1.7 pin respectively with the SSN pin of described time measurement chip U2, SCK pin, SI pin and S0 pin are connected, the P2.0 pin of single-chip microcomputer U1 and P2.1 pin are connected with the FIRE-IN pin of time measurement chip U2 and INT pin respectively.Circuit is simple, dependable performance.
As preferably, described time measuring unit is connected with start-oscillation circuit, start-oscillation circuit comprises resistance R3, crystal oscillator Y and electric capacity C3, electric capacity C4, between the xin pin that resistance R3 is connected to time measurement chip U2 and xout pin, the series circuit of electric capacity C3 and electric capacity C4 and crystal oscillator Y are all in parallel with resistance R3, the also contact ground connection of electric capacity C3 and electric capacity C4.
As preferably, the first described transducer, the second transducer, the 3rd transducer and the 4th transducer lay respectively at the left side of described pipeline, right side, upside and downside.Namely the first transducer, the second transducer, the 3rd transducer and the 4th transducer lay respectively at 0 °, 180 °, 90 ° and 270 ° of places of pipeline.Guarantee the accuracy of gas flow measurement further.
The invention has the beneficial effects as follows: the present invention adopts two pairs of transducers, by measuring adverse current travel-time in gas of the ultrasonic propagation time vertical with gas flow and ultrasound wave and downstream propagation times, obtain the velocity of sound of ultrasound wave in gas medium, thus eliminate temperature, pressure, humidity and group grading factors are on the impact of gas density, and then eliminate the impact of gas density on gas flow measurement, therefore the gas flow measurement obtained by the present invention has good degree of accuracy and accuracy, be applicable to the gas measuring various character, applied widely.
Accompanying drawing explanation
Fig. 1 is the main TV structure schematic diagram of one of the pipeline being provided with first to fourth transducer in the present invention.
Fig. 2 is a kind of side-looking structural representation of the pipeline being provided with first to fourth transducer in the present invention.
Fig. 3 is a kind of circuit theory syndeton block diagram of alliteration road of the present invention gas flow ultrasonic device for measuring.
Fig. 4 is a kind of circuit theory diagrams of alliteration road of the present invention gas flow ultrasonic device for measuring.
1. first transducers in figure, 2. the second transducer, 3. the 3rd transducer, 4. the 4th transducer, 5. pipeline, 6. single machine unit, 7. time measuring unit, 8. driver element, 9. the first multiway analog switch, 10. the second multiway analog switch, 11. first signal condition unit, 12. secondary signal conditioning units.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, technical scheme of the present invention is described in further detail.
Embodiment: the alliteration road gas flow ultrasonic device for measuring of the present embodiment, as shown in Figure 3, comprise the first transducer 1, second transducer 2, the 3rd transducer 3 and the 4th transducer 4 and single machine unit 6, time measuring unit 7, driver element 8, first multiway analog switch 9, second multiway analog switch 10, first signal condition unit 11 and secondary signal conditioning unit 12, single machine unit 6 is connected with time measuring unit 7.As Fig. 1, shown in Fig. 2, first transducer 1, second transducer 2, 3rd transducer 3 and the 4th transducer 4 are arranged on the pipeline 5 of gas flow warp respectively, first transducer 1 and the second transducer 2 with the axis of pipeline 5 for axis of symmetry is symmetrical arranged, 4th transducer 4 and the 3rd transducer 3 lay respectively at upstream side and the downstream of pipeline 5, in Fig. 2, the direction of arrow is gas flow, and the line of the 3rd transducer 3 and the 4th transducer 4 and the axes intersect of pipeline 5 form angle theta, in the present embodiment, angle theta is 40 °, first transducer 1, second transducer 2, 3rd transducer 3 and the 4th transducer 4 lay respectively at the left side of pipeline 5, right side, upside and downside, i.e. the first transducer 1, second transducer 2, 3rd transducer 3 and the 4th transducer 4 lay respectively at 0 ° of pipeline, 180 °, 90 ° and 270 ° of places.As shown in Figure 3, two output terminals of time measuring unit 7 are connected with two input ends of driver element 8 respectively, first output terminal of driver element 8 is connected with the common port of the first multiway analog switch 9, double switch incoming end respectively with the first transducer 1 of the first multiway analog switch 9 and the 3rd transducer 3 are connected, the input end of common port again with the first signal condition unit 11 of the first multiway analog switch 9 is connected, and the output terminal of the first signal condition unit 11 is connected with the first input end of time measuring unit 7.Second output terminal of driver element 8 is connected with the common port of the second multiway analog switch 10, double switch incoming end respectively with the second transducer 2 of the second multiway analog switch 10 and the 4th transducer 4 are connected, the common port of the second multiway analog switch 10 is connected with the input end of secondary signal conditioning unit 12 again, and the output terminal of secondary signal conditioning unit 12 is connected with the second input end of time measuring unit 7.
As shown in Figure 4, single machine unit 6 comprises single-chip microcomputer U1, and single-chip microcomputer U1 adopts MSP430F4351 single-chip microcomputer; Time measuring unit 7 comprises time measurement chip U2, and time measurement chip U2 adopts GP22 time measurement chip; Driver element 8 comprises driving chip U3, and driving chip U3 adopts ULN2803 driving chip; First multiway analog switch 9 comprises multiway analog switch chip U4, and the second multiway analog switch 10 comprises multiway analog switch chip U5, and multiway analog switch chip U4 and multiway analog switch chip U5 all adopts CD74HC4051 switch chip; First signal condition unit 11 comprises comparer U6 and rejection gate U7, secondary signal conditioning unit 12 comprises comparer U8 and rejection gate U9, comparer U6 and comparer U8 all adopts TLV3502 comparer, and rejection gate U7 and rejection gate U8 all adopts SN74LVC1G02 rejection gate.The P2.2 pin of single-chip microcomputer U1, P2.3 pin and P2.4 pin are connected with the S2 pin of multiway analog switch chip U4, S1 pin and S0 pin respectively, the P2.5 pin of single-chip microcomputer U1, P2.6 pin and P2.7 pin are connected with the S2 pin of multiway analog switch chip U5, S1 pin and S0 pin respectively, the P1.4 pin of single-chip microcomputer U1, P1.5 pin, P1.6 pin and P1.7 pin are connected with the SSN pin of time measurement chip U2, SCK pin, SI pin and S0 pin respectively, and the P2.0 pin of single-chip microcomputer U1 and P2.1 pin are connected with the FIRE-IN pin of time measurement chip U2 and INT pin respectively.The fire1 pin of time measurement chip U2 is connected with the 1B pin of driving chip U3, and the 1C pin of driving chip U3 is connected with the A pin of multiway analog switch chip U4, and the A0 pin of multiway analog switch chip U4 and A1 pin respectively with the first transducer 1 and the 3rd transducer 3 are connected.The A pin of multiway analog switch chip U4 is connected through 2 pin of electric capacity C1 and comparer U6 and 3 pin again, 1 pin of comparer U6 connects 3V voltage, 4 pin of comparer U6 connect 1V voltage, 8 pin of comparer U6 meet voltage VCC, the 5 pin ground connection of comparer U6,6 pin of comparer U6 and 7 pin are connected with 2 pin of rejection gate U7 and 1 pin respectively, the 3 pin ground connection of rejection gate U7,5 pin of rejection gate U7 connect 3V voltage, and 4 pin of rejection gate U7 are connected with the stop1 pin of time measurement chip U2.The fire2 pin of time measurement chip U2 is connected with the 2B pin of driving chip U3, and the 2C pin of driving chip U3 is connected with the A pin of multiway analog switch chip U5, and the A0 pin of multiway analog switch chip U5 and A1 pin respectively with the second transducer 2 and the 4th transducer 4 are connected.The A pin of multiway analog switch chip U5 is connected through 2 pin of electric capacity C2 and comparer U8 and 3 pin again, 1 pin of comparer U8 connects 3V voltage, 4 pin of comparer U8 connect 1V voltage, 8 pin of comparer U8 meet voltage VCC, the 5 pin ground connection of comparer U8,6 pin of comparer U8 and 7 pin are connected with 2 pin of rejection gate U9 and 1 pin respectively, the 3 pin ground connection of rejection gate U9,5 pin of rejection gate U9 connect 3V voltage, and 4 pin of rejection gate U9 are connected with the stop2 pin of time measurement chip U2.Time measuring unit 7 is connected with start-oscillation circuit, start-oscillation circuit comprises resistance R3, crystal oscillator Y and electric capacity C3, electric capacity C4, between the xin pin that resistance R3 is connected to time measurement chip U2 and xout pin, the series circuit of electric capacity C3 and electric capacity C4 and crystal oscillator Y are all in parallel with resistance R3, the also contact ground connection of electric capacity C3 and electric capacity C4, in the present embodiment, crystal oscillator Y adopts 4M pottery crystal oscillator.
The measuring method of above-mentioned alliteration road gas flow ultrasonic device for measuring is:
First, under the control of single-chip microcomputer U1, the fire1 human hair combing waste of time measurement chip U2 is penetrated drive singal to the 1B pin of driving chip U3 and is started timing, single-chip microcomputer U1 sends signal and controls multiway analog switch chip U4 gating A0 pin simultaneously, i.e. A0 pin and the conducting of A pin, ultrasound wave is launched in the driving that first transducer 1 is subject to driving chip U3, now single-chip microcomputer U1 sends signal and controls multiway analog switch chip U5 gating A0 pin, i.e. A0 pin and the conducting of A pin, second transducer 2 receives ultrasonic signal and converts thereof into voltage signal, voltage signal passes through by electric capacity C2 and comparer U8, the window comparator elimination noise that rejection gate U9 forms, then this signal is given the stop2 pin of time measurement chip U2, now time measurement chip U2 stops timing, record travel-time T, obtaining the velocity of propagation of ultrasound wave in gas is
C＝D/T，①
Wherein D is the diameter of pipeline 5;
Then single-chip microcomputer U1 again the control time fire1 human hair combing waste of measuring chip U2 penetrate drive singal to the 1B pin of driving chip U3 and start timing, single-chip microcomputer U1 sends signal and controls multiway analog switch chip U4 gating A1 pin simultaneously, i.e. A1 pin and the conducting of A pin, ultrasound wave is launched in the driving that 3rd transducer 3 is subject to driving chip U3, now single-chip microcomputer U1 sends signal and controls multiway analog switch chip U5 gating A1 pin, i.e. A1 pin and the conducting of A pin, 4th transducer 4 receives ultrasonic signal and converts thereof into voltage signal, voltage signal passes through by electric capacity C2 and comparer U8, the window comparator elimination noise that rejection gate U9 forms, then this signal is given the stop2 pin of time measurement chip U2, now time measurement chip U2 stops timing, record adverse current travel-time t2,
Then single-chip microcomputer U1 again the control time fire2 human hair combing waste of measuring chip U2 penetrate drive singal to the 2B pin of driving chip U3 and start timing, single-chip microcomputer U1 sends signal and controls multiway analog switch chip U5 gating A1 pin simultaneously, i.e. A1 pin and the conducting of A pin, ultrasound wave is launched in the driving that 4th transducer 4 is subject to driving chip U3, now single-chip microcomputer U1 sends signal and controls multiway analog switch chip U4 gating A1 pin, i.e. A1 pin and the conducting of A pin, 3rd transducer 3 receives ultrasonic signal and converts thereof into voltage signal, voltage signal passes through by electric capacity C1 and comparer U6, the window comparator elimination noise that rejection gate U7 forms, then this signal is given the stop1 pin of time measurement chip U2, now time measurement chip U2 stops timing, record downstream propagation times t1,
Then downstream propagation times t1, adverse current travel-time t2 and travel-time T are given single-chip microcomputer U1 by time measurement chip U2, are undertaken processing and calculating by single-chip microcomputer U1, obtain Δ T=t2-t1, and Δ T=2LVCos θ/C
2, 2.
Wherein L is the wire length between the 3rd transducer 3 and the 4th transducer 4, and V is the flow velocity of gas,
1. V=Δ TD and is 2. obtained by formula
2/ 2LT
2cos θ, finally calculating by single-chip microcomputer U1 the flow obtaining gas is
the flow value calculated liquor charging crystal display screen display again.
Claims (8)
1. an alliteration road gas flow ultrasonic measurement method, it is characterized in that being provided with the first transducer (1) on the pipeline (5) of gas flow warp, second transducer (2), 3rd transducer (3) and the 4th transducer (4), first transducer (1) and the second transducer (2) are that axis of symmetry is symmetrical arranged with the axis of described pipeline (5), 4th transducer (4) and the 3rd transducer (3) are located at upstream side and the downstream of described pipeline (5) respectively, and the line of the 3rd transducer (3) and the 4th transducer (4) and the axes intersect of described pipeline (5) form angle theta,
Measure the travel-time T of ultrasound wave between the first transducer (1) and the second transducer (2), obtaining the velocity of propagation of ultrasound wave in described gas is
C＝D/T，①
Wherein D is the diameter of described pipeline (5);
Measure ultrasound wave from the 4th transducer (4) to the downstream propagation times t1 of the 3rd transducer (3), measure ultrasound wave from the 3rd transducer (3) to the adverse current travel-time t2 of the 4th transducer (4), obtain Δ T=t2-t1, and Δ T=2LVCos θ/C
2, 2.
Wherein L is the wire length between the 3rd transducer (3) and the 4th transducer (4), and V is the flow velocity of described gas;
1. V=Δ TD and is 2. obtained by formula
2/ 2LT
2cos θ, the flow finally obtaining described gas is
2. one kind uses the measurement mechanism of alliteration road as claimed in claim 1 gas flow ultrasonic measurement method, it is characterized in that comprising single machine unit (6), time measuring unit (7), driver element (8) and signal condition unit and described the first transducer (1), second transducer (2), 3rd transducer (3) and the 4th transducer (4), first transducer (1), second transducer (2), 3rd transducer (3) and the 4th transducer (4) are located on the pipeline (5) of gas flow warp respectively, first transducer (1) and the second transducer (2) are that axis of symmetry is symmetrical arranged with the axis of described pipeline (5), 4th transducer (4) and the 3rd transducer (3) are located at upstream side and the downstream of described pipeline (5) respectively, and the line of the 3rd transducer (3) and the 4th transducer (4) and the axes intersect of described pipeline (5) form angle theta, described single machine unit (6) is connected with time measuring unit (7), the output terminal of time measuring unit (7) is connected with the input end of driver element (8), the output terminal of driver element (8) respectively with described the first transducer (1), 3rd transducer (3) and the 4th transducer (4) are connected, described the second transducer (2), 3rd transducer (3) and the 4th transducer (4) are connected with the input end of described signal condition unit again respectively, the output terminal of signal condition unit is connected with the input end of described time measuring unit (7) respectively.
3. measurement mechanism according to claim 2, it is characterized in that comprising the first multiway analog switch (9), the second multiway analog switch (10), described signal condition unit comprises the first signal condition unit (11) and secondary signal conditioning unit (12), and described the first multiway analog switch (9) and the control end of the second multiway analog switch (10) are connected with described single machine unit (6) respectively; First output terminal of described driver element (8) is connected with the common port of the first multiway analog switch (9), the double switch incoming end of the first multiway analog switch (9) is connected with described the first transducer (1) and the 3rd transducer (3) respectively, the common port of the first multiway analog switch (9) is connected with the input end of the first described signal condition unit (11) again, and the output terminal of the first signal condition unit (11) is connected with the first input end of described time measuring unit (7); Second output terminal of described driver element (8) is connected with the common port of the second multiway analog switch (10), the double switch incoming end of the second multiway analog switch (10) is connected with described the second transducer (2) and the 4th transducer (4) respectively, the common port of the second multiway analog switch (10) is connected with the input end of described secondary signal conditioning unit (12) again, and the output terminal of secondary signal conditioning unit (12) is connected with the second input end of described time measuring unit (7).
4. measurement mechanism according to claim 3, is characterized in that described time measuring unit (7) comprises time measurement chip U2, and time measurement chip U2 adopts GP22 time measurement chip, described driver element (8) comprises driving chip U3, and driving chip U3 adopts ULN2803 driving chip, described the first multiway analog switch (9) comprises multiway analog switch chip U4, described the second multiway analog switch (10) comprises multiway analog switch chip U5, and multiway analog switch chip U4 and multiway analog switch chip U5 all adopts CD74HC4051 switch chip, the fire1 pin of time measurement chip U2 is connected with the 1B pin of driving chip U3, the 1C pin of driving chip U3 is connected with the A pin of multiway analog switch chip U4, the A0 pin of multiway analog switch chip U4 and A1 pin are connected with described the first transducer (1) and the 3rd transducer (3) respectively, the A pin of multiway analog switch chip U4 is connected with the input end of the first described signal condition unit (11), the output terminal of the first signal condition unit (11) is connected with the stop1 pin of time measurement chip U2, the S0 pin of multiway analog switch chip U4, S1 pin and S2 pin are connected with described single machine unit (6) respectively, the fire2 pin of time measurement chip U2 is connected with the 2B pin of driving chip U3, the 2C pin of driving chip U3 is connected with the A pin of multiway analog switch chip U5, the A0 pin of multiway analog switch chip U5 and A1 pin are connected with described the second transducer (2) and the 4th transducer (4) respectively, the A pin of multiway analog switch chip U5 is connected with the input end of described secondary signal conditioning unit (12), the output terminal of secondary signal conditioning unit (12) is connected with the stop2 pin of time measurement chip U2, the S0 pin of multiway analog switch chip U5, S1 pin and S2 pin are connected with described single machine unit (6) respectively.
5. measurement mechanism according to claim 4, it is characterized in that the first described signal condition unit (11) comprises comparer U6 and rejection gate U7, described secondary signal conditioning unit (12) comprises comparer U8 and rejection gate U9, comparer U6 and comparer U8 all adopts TLV3502 comparer, and rejection gate U7 and rejection gate U8 all adopts SN74LVC1G02 rejection gate; The A foot meridian capacitor C1 of described multiway analog switch chip U4 is connected with 2 pin of comparer U6 and 3 pin, 1 pin of comparer U6 connects 3V voltage, 4 pin of comparer U6 connect 1V voltage, 8 pin of comparer U6 meet voltage VCC, the 5 pin ground connection of comparer U6,6 pin of comparer U6 and 7 pin are connected with 2 pin of rejection gate U7 and 1 pin respectively, the 3 pin ground connection of rejection gate U7,5 pin of rejection gate U7 connect 3V voltage, and 4 pin of rejection gate U7 are connected with the stop1 pin of described time measurement chip U2; The A foot meridian capacitor C2 of described multiway analog switch chip U5 is connected with 2 pin of comparer U8 and 3 pin, 1 pin of comparer U8 connects 3V voltage, 4 pin of comparer U8 connect 1V voltage, 8 pin of comparer U8 meet voltage VCC, the 5 pin ground connection of comparer U8,6 pin of comparer U8 and 7 pin are connected with 2 pin of rejection gate U9 and 1 pin respectively, the 3 pin ground connection of rejection gate U9,5 pin of rejection gate U9 connect 3V voltage, and 4 pin of rejection gate U9 are connected with the stop2 pin of described time measurement chip U2.
6. the measurement mechanism according to claim 4 or 5, it is characterized in that described single machine unit (6) comprises single-chip microcomputer U1, single-chip microcomputer U1 adopts MSP430F4351 single-chip microcomputer, the P2.2 pin of single-chip microcomputer U1, P2.3 pin and P2.4 pin respectively with the S2 pin of multiway analog switch chip U4, S1 pin and S0 pin are connected, the P2.5 pin of single-chip microcomputer U1, P2.6 pin and P2.7 pin respectively with the S2 pin of multiway analog switch chip U5, S1 pin and S0 pin are connected, the P1.4 pin of single-chip microcomputer U1, P1.5 pin, P1.6 pin and P1.7 pin respectively with the SSN pin of described time measurement chip U2, SCK pin, SI pin and S0 pin are connected, the P2.0 pin of single-chip microcomputer U1 and P2.1 pin are connected with the FIRE-IN pin of time measurement chip U2 and INT pin respectively.
7. the measurement mechanism according to claim 4 or 5, it is characterized in that described time measuring unit (7) is connected with start-oscillation circuit, start-oscillation circuit comprises resistance R3, crystal oscillator Y and electric capacity C3, electric capacity C4, between the xin pin that resistance R3 is connected to time measurement chip U2 and xout pin, the series circuit of electric capacity C3 and electric capacity C4 and crystal oscillator Y are all in parallel with resistance R3, the also contact ground connection of electric capacity C3 and electric capacity C4.
8. the measurement mechanism according to Claims 2 or 3 or 4 or 5, is characterized in that described the first transducer (1), the second transducer (2), the 3rd transducer (3) and the 4th transducer (4) lay respectively at the left side of described pipeline (5), right side, upside and downside.
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| CN106092230A (en) * | 2016-06-17 | 2016-11-09 | 济南新盛电子科技有限公司 | A kind of alliteration journey transducer ultrasonic ripple gas meter, flow meter |
| CN106840290A (en) * | 2017-01-10 | 2017-06-13 | 合肥工业大学 | A kind of high accuracy quadraphonic gas ultrasound wave current transmitter |
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Application publication date: 20150128 |