CN103630174B - A kind of flow-measuring method of ultrasonic flow meter - Google Patents

A kind of flow-measuring method of ultrasonic flow meter Download PDF

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Publication number
CN103630174B
CN103630174B CN201310668288.5A CN201310668288A CN103630174B CN 103630174 B CN103630174 B CN 103630174B CN 201310668288 A CN201310668288 A CN 201310668288A CN 103630174 B CN103630174 B CN 103630174B
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ultrasonic
pulse signal
calculation unit
ultrasonic sensor
flow
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CN103630174A (en
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张子栖
惠兰
王坤
张陆军
张勇
欧江波
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Chongqing Qianwei Technologies Group Co Ltd
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Chongqing Qianwei Technologies Group Co Ltd
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Abstract

The present invention relates to a kind of flow-measuring method of ultrasonic flow meter, by arranging in the downstream, upstream of ultrasonic flow meter gas flow the transmission and reception that a pair ultrasonic sensor carries out ultrasonic pulse signal, driver module provides the driving voltage driving ultrasonic sensor transmitting portion, measure timing module and send the time started after ultrasonic pulse signal at ultrasonic sensor, be greater than pulse signal voltage threshold values U detecting from first 0umaxi after N number of zero crossing time terminate timing, calculate from timing to stopping mistiming of obtaining of timing; Concurrent-countercurrent respectively surveys once the final flow calculating fluid at measurement timing module.By pulse signal voltage threshold values U 0reasonable set and Signal-regulated kinase except the effect of making an uproar, reduce the measuring error of ultrasonic flow meter gas flow medium-small flow and noise as much as possible to the interference of measurement result Exact Travelling, measuring accuracy is higher.

Description

A kind of flow-measuring method of ultrasonic flow meter
Technical field
The present invention relates to gas instrument technical field, be specifically related to a kind of flow-measuring method of ultrasonic flow meter.
Background technology
In prior art, domestic gas table conventional is at present mainly membrane type gas meter, and its measuring accuracy is very large by the impact of temperature and pressure.Along with the development of science and technology, ultrasonic flow meter arises at the historic moment, and it adopts novel measuring technique, compared with traditional gas table, have and do not contact measured medium, precision is high, good stability, and wide range compares feature, simple structure, mechanicalness moving part are few, the advantages such as volume is little, lightweight.
The technology mainly acoustic velocity measutement technology that ultrasonic flow meter flow measurement adopts, ultimate principle utilizes ultrasound wave to propagate the flow rate information of time institute's carrying object in a fluid to measure fluid flow.Its principle as shown in Figure 1.The measuring method of ultrasonic flow meter flow is divided into according to measuring principle: beam deviation method, correlation method, Noise Method, doppler effect method and propagation time difference method.What be most widely used at present is propagation time difference method.Propagation time difference method has according to the difference of measure physical quantities: time difference method, frequency-difference method and phase difference method.Direct time difference method, time difference method, frequency-difference method and phase difference method are referred to as again propagation speed differential method.This method can not be lost by build-up of pressure, and is applicable to heavy caliber, non-conductive, the gas that corrosion resistivity is strong and liquid.Generally all select time difference method to measure for domestic ultrasonic gas meter at present, time difference method overcomes the error that ultrasonic transmission speed is brought with fluid temperature variations, and accuracy is higher.
The principle that time difference method is measured is: when media flow and ultrasonic propagation clockwise direction, ultrasonic propagation velocity increases with media flow speed and increases, when media flow and ultrasonic propagation reverse direction, ultrasonic propagation velocity increases with media flow speed and reduces.Finally, by measure ultrasonic pulse in a fluid co-current flow and counter-current flow propagate hourly velocity and the difference of time and reflect rate of flow of fluid, its measuring principle is as shown in Figure 2.
Ultrasonic sensor A, ultrasonic sensor B are arranged on the upstream and downstream of gas flowing path in breather line cavity, the ultrasonic sensor A of upstream sends ultrasound wave to the ultrasonic sensor B in downstream, delivery time T1 can be obtained, then ultrasound wave is sent by reverse direction from the upstream ultrasonic sensor A of the ultrasonic sensor B in downstream, delivery time T2 can be obtained, then can obtain the flow velocity U of gas by the following method:
On swim over to delivery time in downstream: ;
Under swim over to delivery time of upstream: ;
Then gas flow rate U is: ;
Wherein L is hyperacoustic propagation distance between ultrasonic sensor A and ultrasonic sensor B, and C is the velocity of propagation in the breather line cavity of ultrasound wave when not having gas to flow, for gas flow direction and transmit the angle in ultrasonic wave path direction between ultrasonic sensor A and ultrasonic sensor B.
If the sectional area of breather line is S, gas flowing time is T, then the flow Q of gas meter is: .
Although time difference method is measured and is avoided the impact of temperature fluctuation on measuring accuracy, but, due in measuring process, obtain stable clearly ultrasound wave waveform, measuring the mistiming is but a very difficult thing, this mainly because: the noise that ultrasound wave can be subject to, these noises are mainly derived from noise that sensor itself brings and the noise that each interlock circuit of circuit board produces.Based on previous reasons, the precision that time difference method is measured is also very limited.
Summary of the invention
For prior art above shortcomings, object of the present invention provides a kind of flow measurement measuring method of new ultrasonic flow meter, and the method avoids temperature and noise as much as possible on the impact of measurement result, improves the accuracy of measurement.
For achieving the above object, the present invention adopts following technical scheme: a kind of flow-measuring method of ultrasonic flow meter, concrete steps are as follows: upstream and downstream ultrasonic sensor A and ultrasonic sensor B being arranged on respectively ultrasonic flow meter gas flow, and the probe of ultrasonic sensor A and ultrasonic sensor B is positioned on the inwall of ultrasonic flow meter gas flow;
S1: predetermined pulse signal voltage threshold values U in controlling calculation unit 0by controlling calculation unit, the gain of amplifying unit and the bandwidth of filter unit are set, the transmission range L of ultrasonic pulse signal in ultrasonic flow meter gas flow in ultrasonic flow meter is also stored, the flow direction of gas and the angle of ultrasonic wave path transmission direction in controlling calculation unit , the cross-sectional area S of ultrasonic flow meter gas flow, , S and L all by measure obtain;
S2: when measurement gas flows to ultrasonic propagation clockwise direction, the delivery time T of ultrasound wave in Ultrasonic Wave Flowmeter runner 1, concrete steps are as follows:
S21: the controlling calculation unit of processor module sends Pulse-trigger control signal to measurement timing module, measure timing module and send drive singal according to the Pulse-trigger control signal control driver module received, now, sensor control block controls ultrasonic sensor A and receives drive singal and send ultrasonic pulse signal Us, and ultrasonic sensor B is for receiving ripple signal Us;
S22: ultrasonic sensor A when receiving drive singal and send ultrasonic pulse signal Us, makes feedback to controlling calculation unit, and controlling calculation unit controls is measured timing module and started timing;
S23: all signals that ultrasonic sensor B receives by Signal-regulated kinase are undertaken mating by matching unit, filter unit carries out filtering and amplifying unit carries out amplification process, and the noise received when ultrasonic sensor B is accepted ultrasonic pulse signal Us filters;
S24: the signal after step S23 process is defined as the ultrasonic pulse signal Us sent by ultrasonic sensor A that ultrasonic sensor B receives, and is designated as Us ', peak detection unit detects ultrasonic pulse signal Us 'multiple peak value Umaxi, by multiple Umaxi respectively with pulse signal voltage threshold values U 0comparing, being greater than pulse signal voltage threshold values U when obtaining first 0umaxi time, controlling calculation unit sends to measurement timing module that begin can stop signal, is greater than pulse signal voltage threshold values U when measurement timing module detects from first 0umaxi after N number of zero crossing time, measure timing module and stop timing also sending the feedback stopping timing to controlling calculation unit, measure timing module and be T from starting the mistiming that timing obtains to stopping timing 1;
S3: when measurement gas flows to ultrasonic propagation reverse direction, the delivery time T of ultrasound wave in Ultrasonic Wave Flowmeter runner 2, concrete steps are as follows:
S31: controlling calculation unit sends Pulse-trigger control signal to measurement timing module, measure timing module and send drive singal according to the Pulse-trigger control signal control driver module received, now, sensor control block controls ultrasonic sensor B and receives drive singal and send ultrasonic pulse signal Un, and ultrasonic sensor A is for receiving ripple signal Un;
S32: ultrasonic sensor B when receiving drive singal and send ultrasonic pulse signal Un, makes feedback to controlling calculation unit, and controlling calculation unit controls is measured timing module and started timing;
S33: all signals that ultrasonic sensor A receives by Signal-regulated kinase are undertaken mating by matching unit, filter unit carries out filtering and amplifying unit carries out amplification process, and the noise received when ultrasonic sensor A is accepted ultrasonic pulse signal Un filters;
S34: the signal after step S33 process is defined as the ultrasonic pulse signal Un sent by ultrasonic sensor B that ultrasonic sensor A receives, and is designated as Un ', peak detection unit detects ultrasonic pulse signal Un 'multiple peak value Umaxj, by multiple Umaxj respectively with pulse signal voltage threshold values U 0comparing, being greater than pulse signal voltage threshold values U when obtaining first 0umaxj time, controlling calculation unit sends to measurement timing module that begin can stop signal, is greater than pulse signal voltage threshold values U when measurement timing module detects from first 0umaxi after N number of zero crossing time (please determine the detection of N number of zero crossing by peak detection unit or measure timing module complete), measuring timing module stops timing also sending the feedback stopping timing to controlling calculation unit, measures timing module and is T from starting the mistiming that timing obtains to stopping timing 2;
S4: the T2 that T1 and S34 that S24 obtains by measurement timing module obtains transfers to the controlling calculation unit of processor module, and controlling calculation unit calculates gas flow Q according to formula (1) and (2),
(1);
(2);
In formula (1), U is the flow velocity of gas, and L is the transmission range of ultrasonic pulse signal in ultrasonic flow meter gas flow; for the flow direction of gas and the angle of ultrasonic pulse signal transmission path; In formula (2), S is the cross-sectional area of ultrasonic flow meter gas flow, and T is the time of circulated gases in ultrasonic flow meter gas flow;
S5: Pulse-trigger control unit controls computing unit sends the time interval T of Pulse-trigger control signal to measuring timing module pwith number of times 2M, controlling calculation unit sends adjacent twice Pulse-trigger control signal to measurement timing module just can obtain a gas flow Qi, and namely the average that controlling calculation unit calculates this M Qi obtain the flow of ultrasonic flow meter.
Compared to existing technology, the present invention has following beneficial effect:
1. flow-measuring method provided by the invention, owing to devising Signal-regulated kinase, therefore, filters the noise introduced when accepting ultrasonic pulse signal, thus avoids the interference of noise to measurement result Exact Travelling as much as possible.
2. flow-measuring method provided by the invention, is detected from first by measurement timing module and is greater than pulse signal voltage threshold values U 0umaxi after N number of zero crossing time just stop timing, namely think now, ultrasonic pulse signal just just very received by another ultrasonic sensor, pulse signal voltage threshold values U 0the empirical value that inventor obtains after test of many times and data analysis, therefore, by pulse signal voltage threshold values U 0reasonable set, reduce the measuring error of ultrasonic flow meter gas flow medium-small flow as much as possible, make measuring accuracy higher; Simultaneously by pulse signal voltage threshold values U 0reasonable set and the acting in conjunction of Signal-regulated kinase, even if under noise circumstance complicated situation, also accurately can judge the time that ultrasonic pulse signal is received.
3. can in one transmission through repetitive measurement, the accuracy of guaranteed flow point.
4. when the gas flow rate flowing through ultrasonic flow meter gas flow is larger, the transmission of ultrasonic pulse signal and reception are also subject to the interference of flow velocity, the waveform of the ultrasonic pulse signal received probably is submerged in a reactor noise, the measuring method provided of the present invention can be disturbed by Signal-regulated kinase process filtering noise, cannot pass through pulse signal voltage threshold values U at noise when filtering 0reasonable set judge effective noise.
Accompanying drawing explanation
Fig. 1 is the ultimate principle block diagram adopting supersonic technique to measure ultrasonic flow meter flow in prior art.
Fig. 2 is the measuring principle figure of time difference method in prior art.
The functional-block diagram of Fig. 3 the present embodiment 1.
In figure, processor module 10, peak detection unit 11, Pulse-trigger control unit 13, controlling calculation unit 15, measurement timing module 20, driver module 30, sensor control block 40, Signal-regulated kinase 50, matching unit 51, filter unit 53, amplifying unit 55.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.
Embodiment 1: as shown in Figure 3, a kind of flow measurement circuit of ultrasonic flow meter, comprises processor module 10, measures timing module 20, driver module 30, sensor control block 40, Signal-regulated kinase 50, ultrasonic sensor A and ultrasonic sensor B; Wherein, ultrasonic sensor A and ultrasonic sensor B is arranged on the upstream and downstream of ultrasonic flow meter gas flow respectively, launch ultrasonic signal respectively to the other side and receive the ultrasonic signal of the other side, the probe of ultrasonic sensor A and ultrasonic sensor B is positioned on the inwall of ultrasonic flow meter gas flow, the probe of ultrasonic sensor A and ultrasonic sensor B flushes with the inwall of ultrasonic flow meter gas flow simultaneously, does not produce inhibition to the gas in ultrasonic flow meter gas flow.
Described processor module 10 comprises peak detection unit 11, Pulse-trigger control unit 13 and controlling calculation unit 15, described peak detection unit 11 and Pulse-trigger control unit 13 respectively controlling calculation unit 15 are connected, wherein the signal input part of peak detection unit 11 is connected with the output terminal of amplifying unit 55, the control signal output terminal of controlling calculation unit 15 is connected with the control signal input end measuring timing module 20, measures the testing result output terminal of timing module 20 and is connected with the calculating parameter input end of controlling calculation unit 15; Controlling calculation unit 15 also has Gain tuning control signal output terminal and transmitting-receiving ultrasound wave switch-over control signal output terminal, the Gain tuning control signal output terminal of controlling calculation unit 15 is connected with the control signal input end of amplifying unit 55, and transmitting-receiving ultrasound wave switch-over control signal output terminal is connected with the control signal input end of sensor control block 40.
The peak value of the ultrasonic pulse signal that peak detection unit 11 sends for the ultrasonic sensor A detecting ultrasonic sensor B and receive, this peak transmission is to controlling calculation unit, controlling calculation unit 15 to amplifying unit 55 sending controling instruction, adjusts the gain of amplifying unit 55 according to the relation flow through between the gas flow of ultrasonic flow meter gas flow and this peak value;
Pulse-trigger control unit 13 sends the time interval and the number of times of Pulse-trigger control signal for controlling controlling calculation unit 15 to measuring timing module 20; Preset in advance Pulse-trigger control unit 13 controls time interval that controlling calculation unit 15 transmits control signal and number of times.
Controlling calculation unit 15 is for sending Pulse-trigger control signal to measurement timing module 20; Also for sending transmitting-receiving ultrasound wave switch-over control signal to sensor control block 40, switch the state of the transmitting-receiving ultrasonic pulse signal of ultrasonic sensor A and ultrasonic sensor B; Also for sending Gain tuning control signal to amplifying unit 55, the gain of adjustment amplifying unit 55; Also for according to measure timing module 20 transmit gas flow and ultrasonic propagation clockwise direction time, the delivery time T of ultrasound wave in Ultrasonic Wave Flowmeter runner 1, when gas flow and ultrasonic propagation reverse direction, the delivery time T of ultrasound wave in Ultrasonic Wave Flowmeter runner 2, in the transmission range of ultrasonic pulse signal in ultrasonic flow meter gas flow (being in fact the air line distance of probe to the probe of ultrasonic sensor B of ultrasonic sensor A) obtained by measurement, the cross-sectional area of ultrasonic flow meter gas flow and ultrasonic flow meter gas flow, the Time Calculation of circulated gases goes out the flow of gaseous state.
Measure timing module 20 and send drive singal for controlling driver module 30 to sensor control block 40, also for recording the timing of ultrasonic sensor transmitting-receiving ultrasonic pulse signal.
Driver module 30 is for sending ultrasonic pulse drive singal to sensor control block 40, driver module 30 driving signal input is connected with the drive singal output terminal measuring timing module 20, the drive singal output terminal of driver module 30 is connected with the signal input part of sensor control block 40, sensor control block 40 has two control ends, these two control ends respectively with ultrasonic sensor A, the trigger pip input end of ultrasonic sensor B connects, sensor control block 40 is for controlling ultrasonic sensor A or ultrasonic sensor B sends ultrasonic pulse drive singal, and by the Signal transmissions of reception to matching unit 51,
Described Signal-regulated kinase 50 comprises the matching unit 51, filter unit 53 and the amplifying unit 55 that connect successively; The signal output part of sensor control block 40 and the input end of matching unit 51 communicate to connect, the signal output part of amplifying unit 55 communicates to connect with the signal input part measuring timing module 20, Signal-regulated kinase 50 processes for the signal used received by sonic sensor A or ultrasonic sensor B, filtered noise.
A flow-measuring method for ultrasonic flow meter, concrete steps are as follows:
The mounting means of ultrasonic sensor A and ultrasonic sensor B as above;
S1: predetermined pulse signal voltage threshold values U in controlling calculation unit 15 0, U 0it is empirical value, because the waveform of the ultrasonic pulse signal of ultrasonic sensor reception can change along with the difference of the flow flowing through ultrasonic flow meter gas flow, each co-current flow and counter-current flow is wanted all to test the zero crossing of same ripple, then need the scope of monitoring each peak value of ultrasonic pulse signal in the process of test, choose U 0not only be no more than next peak value but also higher than peak value before, avoid the waveform testing of co-current flow and counter-current flow to cause the miscount of co-current flow and counter-current flow time to different zero crossings, cause the wrong identification of flow.By the controlling calculation unit 15 of processor module 10, the gain of amplifying unit 55 and the bandwidth of filter unit 53 are set, the transmission range L of ultrasonic pulse signal in ultrasonic flow meter gas flow in ultrasonic flow meter is also stored, the flow direction of gas and the angle of ultrasonic wave path transmission direction in controlling calculation unit 15 , the cross-sectional area S of ultrasonic flow meter gas flow, , S and L all by measure obtain;
S2: measurement gas flows to and (it is acute angle or zero degree that the clockwise direction in the present invention refers to the angle that ultrasonic propagation direction and measurement gas flow to) during ultrasonic propagation clockwise direction, the delivery time T of ultrasound wave in Ultrasonic Wave Flowmeter runner 1, concrete steps are as follows:
S21: controlling calculation unit 15 sends Pulse-trigger control signal to measurement timing module 20, measure timing module 20 and send drive singal according to the Pulse-trigger control signal control driver module 30 received, now, sensor control block 40 controls ultrasonic sensor A and receives drive singal and send ultrasonic pulse signal Us, and ultrasonic sensor B is for receiving ripple signal Us;
S22: ultrasonic sensor A when receiving drive singal and send ultrasonic pulse signal Us, and make feedback to controlling calculation unit 15, controlling calculation unit 15 control survey timing module 20 starts timing;
S23: all signals that ultrasonic sensor B receives by Signal-regulated kinase 50 are undertaken mating by matching unit 51, filter unit 53 carries out filtering and amplifying unit 55 carries out amplification process, the noise received when ultrasonic sensor B is accepted ultrasonic pulse signal Us filters, thus ensure that the signal entering next step process is the ultrasonic signal Us that ultrasonic sensor A sends;
S24: the signal after step S23 process is defined as the ultrasonic pulse signal Us sent by ultrasonic sensor A that ultrasonic sensor B receives, and is designated as Us ', peak detection unit 11 detects ultrasonic pulse signal Us 'multiple peak value Umaxi, by multiple Umaxi respectively with pulse signal voltage threshold values U 0comparing, being greater than pulse signal voltage threshold values U when obtaining first 0umaxi time, controlling calculation unit 15 sends to measurement timing module 20 that begin can stop signal, and (namely sending to measuring timing module the signal preparing to stop timing), is greater than pulse signal voltage threshold values U when measurement timing module 20 detects from first 0umaxi after N number of zero crossing time, measure timing module and stop timing also sending the feedback stopping timing to controlling calculation unit, measure timing module 20 and be T from starting the mistiming that timing obtains to stopping timing 1;
S3: measurement gas flows to and (it is time angle or 180 ° that the reverse direction in the present invention refers to angle that ultrasonic propagation direction and measurement gas flow to) during ultrasonic propagation reverse direction, the delivery time T of ultrasound wave in Ultrasonic Wave Flowmeter runner 2, concrete steps are as follows:
S31: controlling calculation unit 15 sends Pulse-trigger control signal to measurement timing module 20, measure timing module 20 and send drive singal according to the Pulse-trigger control signal control driver module 30 received, now, sensor control block 40 controls ultrasonic sensor B and receives drive singal and send ultrasonic pulse signal Un, and ultrasonic sensor A is for receiving ripple signal Un;
S32: ultrasonic sensor B when receiving drive singal and send ultrasonic pulse signal Un, makes feedback to controlling calculation unit 15, and controlling calculation unit 15 controls control survey timing module (20) and starts timing;
S33: all signals that ultrasonic sensor A receives by Signal-regulated kinase 50 are undertaken mating by matching unit 51, filter unit 53 carries out filtering and amplifying unit 55 carries out amplification process, the noise received when ultrasonic sensor A is accepted ultrasonic pulse signal Un filters, thus ensure that the signal entering next step process is the ultrasonic signal Us that ultrasonic sensor A sends;
S34: the signal after step S33 process is defined as the ultrasonic pulse signal Un sent by ultrasonic sensor B that ultrasonic sensor A receives, and is designated as Un ', peak detection unit 11 detects ultrasonic pulse signal Un 'multiple peak value Umaxj, by multiple Umaxj respectively with pulse signal voltage threshold values U 0comparing, being greater than pulse signal voltage threshold values U when obtaining first 0umaxj time, controlling calculation unit 15 sends to measurement timing module 20 that begin can stop signal, and (namely sending to measuring timing module 20 signal preparing to stop timing), is greater than pulse signal voltage threshold values U when measurement timing module 20 detects from first 0umaxi after N number of zero crossing time, measure timing module and stop timing also sending the feedback stopping timing to controlling calculation unit, measure timing module 20 and be T from starting the mistiming that timing obtains to stopping timing 2;
S4: the T2 that T1 and S34 that S24 obtains by measurement timing module 20 obtains transfers to the controlling calculation unit 15 of processor module 10, and controlling calculation unit 15 calculates gas flow Q according to formula (1) and (2),
(1);
(2);
In formula (1), U is the flow velocity of gas, and L is the transmission range of ultrasonic pulse signal in ultrasonic flow meter gas flow for the flow direction of gas and the angle of ultrasonic pulse signal transmission path; In formula (2), S is the cross-sectional area of ultrasonic flow meter gas flow, and T is the time of circulated gases in ultrasonic flow meter gas flow; S, T and L can be obtained by measurement;
S5: Pulse-trigger control unit 13 controlling calculation unit 15 sends the time interval T of Pulse-trigger control signal to measuring timing module 20 pwith number of times 2M, controlling calculation unit 15 sends adjacent twice Pulse-trigger control signal to measurement timing module 20 just can obtain a gas flow Qi, (adjacent twice Pulse-trigger control signal makes sensor control block 40 control ultrasonic sensor A and ultrasonic sensor B once receives and dispatches respectively, and the ultrasonic sensor A controlling to be positioned at the upstream of ultrasonic flow meter gas flow first sends ultrasonic pulse signal, the ultrasonic sensor B being positioned at downstream receives; And then the ultrasonic sensor B controlling to be positioned at downstream sends ultrasonic pulse signal, and the ultrasonic sensor A being positioned at upstream receives.) namely controlling calculation unit 15 average that calculates this M Qi obtain the flow of ultrasonic flow meter, wherein time interval T pall can arrange according to precision with number of times 2M, the minimum value of generally getting Tp is: send ultrasonic pulse signal from a ultrasonic sensor and receive this signal to another ultrasonic sensor and measure timing module and detect from first and be greater than pulse signal voltage threshold values U 0umaxi after N number of zero crossing time timing time, be minimum interval during this period of time, the time interval is because of different ultrasonic flow meter , S and L and different, therefore the Tp of different ultrasonic flow meter is also different.The scope of M is: between 2 ~ 128 times.
Select two ultrasonic flow meter below, adopt the inventive method and time difference method to test the flow flowing through its runner respectively, the results are shown in Table 1 and table 2 ultrasonic flow meter 1, 1=45 °, S1=300mm 2and L1=150mm.
Table 1
Ultrasonic flow meter 2, 2=45 °, S2=350mm 2and L2=120mm.
Table 2
Can be found out by the data in table 1 ~ 2, the error that the inventive method measures ultrasonic flow meter is far smaller than time difference method, and therefore the accuracy of detection of visible the inventive method is higher, less by ectocine.
The invention discloses a kind of flow measurement circuit of ultrasonic flow meter and use this metering circuit to carry out the method for flow measurement, by at the upstream side of ultrasonic flow meter gas flow and interval, downstream predetermined distance and at least one pair of ultrasonic sensor arranged carries out transmission and the reception of ultrasonic pulse signal, according to the travel-time of the ultrasonic sensor of ultrasonic pulse signal from the ultrasonic sensor of upstream side to downstream, obtain the flow velocity of detected fluid in ultrasonic flow meter gas flow or/and flow.Sensor control block, it switches the both transmit and receive direction of a pair ultrasonic sensor; Driver module, it provides the driving voltage driving ultrasonic sensor transmitting portion; Measure timing module, it sends the time started after ultrasonic pulse signal according to ultrasonic sensor, and is greater than pulse signal voltage threshold values U detecting from first 0umaxi after N number of zero crossing time terminate timing, calculate ultrasonic sensor and send ultrasonic pulse signal receives this signal time to another ultrasonic sensor; Signal-regulated kinase, its ultrasonic pulse signal received by another ultrasonic sensor carries out filter amplifying processing; When measurement timing module detects that first is greater than pulse signal voltage threshold values U 0ultrasonic pulse signal peak value after, start to receive zero crossing and stop timing after receiving N number of zero crossing, processor module, it detects the mean value of successful ultrasonic propagation time according to above-mentioned acceptance point, obtains the flow velocity of measured fluid or/and flow.
In ultrasonic measurement circuit described in the present invention and method, by the peak detection unit of control module, when there is peak value lower than this ripple of peak value that threshold values exceedes previous ripple, enable reception zero cross point, the zero cross point of this ripple is detected as acceptance point, is set to the end time at N number of zero crossing.When the peak value detecting the next ripple does not successfully exceed threshold values, be judged as cross point detection failure, then give up to fall data, again detecting waiting pulse to be sent.
Finally it should be noted that, above embodiment is only in order to illustrate technical scheme of the present invention but not restriction technologies scheme, although applicant's reference preferred embodiment is to invention has been detailed description, those of ordinary skill in the art is to be understood that, those amendments that technical scheme of the present invention is carried out or equivalently to replace, and do not depart from aim and the scope of the technical program, all should be encompassed in the middle of right of the present invention.

Claims (1)

1. a flow-measuring method for ultrasonic flow meter, is characterized in that, concrete steps are as follows:
Ultrasonic sensor A and ultrasonic sensor B is arranged on respectively ultrasonic flow meter gas flow upstream and under
Trip, the probe of ultrasonic sensor A and ultrasonic sensor B is positioned on the inwall of ultrasonic flow meter gas flow;
S1: predetermined pulse signal voltage threshold values U in controlling calculation unit (15) 0by controlling calculation unit (15), the gain of amplifying unit (55) and the bandwidth of filter unit (53) are set, the transmission range L of ultrasonic pulse signal in ultrasonic flow meter gas flow in ultrasonic flow meter is also stored, the flow direction of gas and the angle of ultrasonic wave path transmission direction in controlling calculation unit (15) , the cross-sectional area S of ultrasonic flow meter gas flow, , S and L all by measure obtain;
S2: when measurement gas flows to ultrasonic propagation clockwise direction, the delivery time T of ultrasound wave in Ultrasonic Wave Flowmeter runner 1, concrete steps are as follows:
S21: the controlling calculation unit (15) of processor module (10) sends Pulse-trigger control signal to measurement timing module (20), measure timing module (20) and send drive singal according to Pulse-trigger control signal control driver module (30) received, now, sensor control block (40) controls ultrasonic sensor A and receives drive singal and send ultrasonic pulse signal Us, and ultrasonic sensor B is for receiving ripple signal Us;
S22: ultrasonic sensor A when receiving drive singal and send ultrasonic pulse signal Us, makes feedback to controlling calculation unit (15), and controlling calculation unit (15) control survey timing module (20) starts timing;
S23: all signals that ultrasonic sensor B receives by Signal-regulated kinase (50) are undertaken mating by matching unit (51), filter unit (53) carries out filtering and amplifying unit (55) carries out amplification process, and the noise received when ultrasonic sensor B is accepted ultrasonic pulse signal Us filters;
S24: the signal after step S23 process is defined as the ultrasonic pulse signal Us sent by ultrasonic sensor A that ultrasonic sensor B receives, and is designated as Us ', peak detection unit (11) detects ultrasonic pulse signal Us 'multiple peak value Umaxi, by multiple Umaxi respectively with pulse signal voltage threshold values U 0comparing, being greater than pulse signal voltage threshold values U when obtaining first 0umaxi time, controlling calculation unit (15) sends to measurement timing module (20) that begin can stop signal, is greater than pulse signal voltage threshold values U when measurement timing module (20) detects from first 0umaxi after N number of zero crossing time, measure timing module (20) and stop timing also sending the feedback stopping timing to controlling calculation unit (15), measure timing module (20) and be T from starting the mistiming that timing obtains to stopping timing 1;
As threshold voltage U 0exceed the peak value of previous ripple and peak value lower than this ripple time, the beginning can receive zero cross point, and the zero cross point of this ripple is detected as acceptance point, is set to the end time at N number of zero crossing; Threshold voltage U is not exceeded at the peak value detecting the next ripple successfully 0time, be judged as cross point detection failure, then give up to fall data, again detecting waiting pulse to be sent;
S3: when measurement gas flows to ultrasonic propagation reverse direction, the delivery time T of ultrasound wave in Ultrasonic Wave Flowmeter runner 2, concrete steps are as follows:
S31: controlling calculation unit (15) sends Pulse-trigger control signal to measurement timing module (20), measure timing module (20) and send drive singal according to Pulse-trigger control signal control driver module (30) received, now, sensor control block (40) controls ultrasonic sensor B and receives drive singal and send ultrasonic pulse signal Un, and ultrasonic sensor A is for receiving ripple signal Un;
S32: ultrasonic sensor B when receiving drive singal and send ultrasonic pulse signal Un, makes feedback to controlling calculation unit (15), and controlling calculation unit (15) control survey timing module (20) starts timing;
S33: all signals that ultrasonic sensor A receives by Signal-regulated kinase (50) are undertaken mating by matching unit (51), filter unit (53) carries out filtering and amplifying unit (55) carries out amplification process, and the noise received when ultrasonic sensor A is accepted ultrasonic pulse signal Un filters;
S34: the signal after step S33 process is defined as the ultrasonic pulse signal Un sent by ultrasonic sensor B that ultrasonic sensor A receives, and is designated as Un ', peak detection unit (11) detects ultrasonic pulse signal Un 'multiple peak value Umaxj, by multiple Umaxj respectively with pulse signal voltage threshold values U 0comparing, being greater than pulse signal voltage threshold values U when obtaining first 0umaxj time, controlling calculation unit (15) sends to measurement timing module (20) that begin can stop signal, is greater than pulse signal voltage threshold values U when measurement timing module (20) detects from first 0umaxi after N number of zero crossing time, measure timing module (20) and stop timing also sending the feedback stopping timing to controlling calculation unit (15), measure timing module (20) and be T from starting the mistiming that timing obtains to stopping timing 2;
As threshold voltage U 0exceed the peak value of previous ripple and peak value lower than this ripple time, the beginning can receive zero cross point, and the zero cross point of this ripple is detected as acceptance point, is set to the end time at N number of zero crossing; Threshold voltage U is not exceeded at the peak value detecting the next ripple successfully 0time, be judged as cross point detection failure, then give up to fall data, again detecting waiting pulse to be sent;
S4: the T2 that T1 and S34 that S24 obtains by measurement timing module (20) obtains transfers to the controlling calculation unit (15) of processor module (10), and controlling calculation unit (15) calculates gas flow Q according to formula (1) and (2),
(1);
(2);
In formula (1), U is the flow velocity of gas, and L is the transmission range of ultrasonic pulse signal in ultrasonic flow meter gas flow; for the flow direction of gas and the angle of ultrasonic pulse signal transmission path; In formula (2), S is the cross-sectional area of ultrasonic flow meter gas flow, and T is the time of circulated gases in ultrasonic flow meter gas flow;
S5: Pulse-trigger control unit (13) controlling calculation unit (15) sends the time interval T of Pulse-trigger control signal to measuring timing module (20) pwith number of times 2M, controlling calculation unit (15) sends adjacent twice Pulse-trigger control signal just can obtain a gas flow Qi to measurement timing module (20), and namely the average that controlling calculation unit (15) calculates this M Qi obtain the flow of ultrasonic flow meter.
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