CN103630174A - Flow measuring method of ultrasonic flow meter - Google Patents
Flow measuring method of ultrasonic flow meter Download PDFInfo
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- CN103630174A CN103630174A CN201310668288.5A CN201310668288A CN103630174A CN 103630174 A CN103630174 A CN 103630174A CN 201310668288 A CN201310668288 A CN 201310668288A CN 103630174 A CN103630174 A CN 103630174A
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Abstract
The invention relates to a flow measuring method of an ultrasonic flow meter. The method comprises the following steps: arranging a pair of ultrasonic sensors on the upper stream and lower stream of a gas flow channel of the ultrasonic flow meter for transmitting and receiving ultrasonic pulse signals, providing a driving voltage for driving transmitting parts of the ultrasonic sensors by using a driving module, measuring time when a timing module starts timing after ultrasonic pulse signals are transmitted by the ultrasonic sensors, stopping timing when an Nth zero crossing point is detected after first Umaxi which is larger than a pulse signal voltage threshold U0, and calculating a time difference between the start of timing and the stop of timing; measuring once downstream and upstream respectively, and calculating the flow of fluid on a measurement timing module. Through reasonable setting of the pulse signal voltage threshold U0 and the noise removing function of a signal conditioning module, the measuring error of small flow in a gas flow channel of the ultrasonic flow meter and the interference of noise on the accuracy of a measuring result are reduced to the largest extent, and higher measuring accuracy is achieved.
Description
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, conventional domestic gas table is mainly membrane type gas meter at present, and its measuring accuracy is subject to the impact of temperature and pressure very large.Along with scientific and technical development, ultrasonic flow meter arises at the historic moment, and it is to adopt novel measuring technique, compares with traditional gas meter, 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 advantage such as volume is little, lightweight.
The technology that ultrasonic flow meter flow measurement adopts is mainly acoustic velocity measutement technology, and ultimate principle is that the flow rate information of utilizing ultrasound wave to propagate time institute's carrying object in fluid is measured fluid flow.Its principle as shown in Figure 1.The measuring method of ultrasonic flow meter flow is divided into according to measuring principle: wave beam deflection 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.Directly 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 lost by build-up of pressure, and is applicable to heavy caliber, non-conductive, the gas that corrosion resistivity is strong and liquid.For domestic ultrasonic gas meter, generally all select time difference method to measure at present, time difference method has overcome 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 are during along direction, ultrasonic propagation velocity increases with media flow speed, when media flow and ultrasonic propagation are during against direction, ultrasonic propagation velocity increases and reduces with media flow speed.Finally, when by measurement ultrasonic pulse, in fluid, co-current flow and counter-current flow is propagated, speed and the difference of time reflect rate of flow of fluid, and its measuring principle 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, can obtain delivery time T1, then by reverse direction, from the upstream ultrasonic sensor A of ultrasonic sensor B in downstream, send ultrasound wave, can obtain delivery time T2, then can obtain by the following method the flow velocity U of gas:
On swim over to delivery time in downstream:
;
Under swim over to delivery time of upstream:
;
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 there is no gas flow,
for transmitting the angle of ultrasound wave path direction between the flow direction of gas and ultrasonic sensor A and ultrasonic sensor B.
If the sectional area of breather line is S, the gas flow time is T, and the flow Q of gas meter is:
.
Although measuring, time difference method 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 be mainly because: the noise that ultrasound wave can be subject to, these noises are mainly derived from the noise that noise that sensor itself brings and each interlock circuit of circuit board produce.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 has been avoided temperature and the impact of noise on measurement result as much as possible, has improved the accuracy of measuring.
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: ultrasonic sensor A and ultrasonic sensor B are arranged on respectively to the upstream and downstream of ultrasonic flow meter gas flow, 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 computing unit
0by controlling computing unit, the gain of amplifying unit and the bandwidth of filter unit are set, control in computing unit and also store the transmission range L of ultrasonic pulse signal in ultrasonic flow meter gas flow in ultrasonic flow meter, the angle of the flow direction of gas and ultrasound wave path transmission direction
, the cross-sectional area S of ultrasonic flow meter gas flow,
, S and L all can obtain by measurement;
S2: when measurement gas flows to ultrasonic propagation along direction, the delivery time T of ultrasound wave in Ultrasonic Wave Flowmeter runner
1, concrete steps are as follows:
S21: the control computing unit of processor module sends Pulse-trigger control signal to measuring timing module, measure timing module and send driving signal according to the Pulse-trigger control signal controlling driver module receiving, now, sensor control module is controlled ultrasonic sensor A and is received driving signal and send ultrasonic pulse signal Us, and ultrasonic sensor B is used for receiving ripple signal Us;
S22: ultrasonic sensor A receives when driving signal and sending ultrasonic pulse signal Us, makes feedback to controlling computing unit, controls computing unit control survey timing module and starts timing;
S23: all signals that signal condition module receives ultrasonic sensor B by matching unit mate, filter unit carries out filtering and amplifying unit amplifies processing, the noise receiving when ultrasonic sensor B is accepted to ultrasonic pulse signal Us filters;
S24: the signal after step S23 processes is defined as the ultrasonic pulse signal Us being sent by ultrasonic sensor A that ultrasonic sensor B receives, and is designated as Us
', peak detection unit detects ultrasonic pulse signal Us
'a plurality of peak value Umaxi, by a plurality of Umaxi respectively with pulse signal voltage threshold values U
0compare, when obtaining first, be greater than pulse signal voltage threshold values U
0umaxi time, control computing unit to measure timing module send the beginning can stop signal, when measuring timing module, detect from first and be greater than pulse signal voltage threshold values U
0umaxi after during N zero crossing, measure timing module and stop timing and send to controlling computing unit the feedback that stops timing, measure timing module and to stopping the mistiming that timing obtains, be T from starting timing
1;
S3: when measurement gas flows to ultrasonic propagation against direction, the delivery time T of ultrasound wave in Ultrasonic Wave Flowmeter runner
2, concrete steps are as follows:
S31: control computing unit and send Pulse-trigger control signal to measuring timing module, measure timing module and send driving signal according to the Pulse-trigger control signal controlling driver module receiving, now, sensor control module is controlled ultrasonic sensor B and is received driving signal and send ultrasonic pulse signal Un, and ultrasonic sensor A is used for receiving ripple signal Un;
S32: ultrasonic sensor B receives when driving signal and sending ultrasonic pulse signal Un, makes feedback to controlling computing unit, controls computing unit control survey timing module and starts timing;
S33: all signals that signal condition module receives ultrasonic sensor A by matching unit mate, filter unit carries out filtering and amplifying unit amplifies processing, the noise receiving when ultrasonic sensor A is accepted to ultrasonic pulse signal Un filters;
S34: the signal after step S33 processes is defined as the ultrasonic pulse signal Un being sent by ultrasonic sensor B that ultrasonic sensor A receives, and is designated as Un
', peak detection unit detects ultrasonic pulse signal Un
'a plurality of peak value Umaxj, by a plurality of Umaxj respectively with pulse signal voltage threshold values U
0compare, when obtaining first, be greater than pulse signal voltage threshold values U
0umaxj time, control computing unit to measure timing module send the beginning can stop signal, when measuring timing module, detect from first and be greater than pulse signal voltage threshold values U
0umaxi after during N zero crossing (detection that please determine N zero crossing is by peak detection unit or measuring timing module completes), measure timing module and stop timing and send to controlling computing unit the feedback that stops timing, measure timing module and to stopping the mistiming that timing obtains, be T from starting timing
2;
S4: the T2 that the T1 that measurement timing module obtains S24 and S34 obtain transfers to the control computing unit of processor module, controls computing unit and calculates gas flow Q according to formula (1) and (2),
The flow velocity that in formula (1), U is gas, 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 measurement timing module
pwith number of times 2M, to control computing unit and send adjacent twice Pulse-trigger control signal and just can obtain a gas flow Qi to measuring timing module, the average that control computing 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 having designed signal condition module, therefore, the noise of introducing when accepting ultrasonic pulse signal filters, thereby has avoided as much as possible the interference of noise to measurement result Exact Travelling.
2. flow-measuring method provided by the invention, is detected from first and is greater than pulse signal voltage threshold values U by measurement timing module
0umaxi after just stop timing during N zero crossing, think now, ultrasonic pulse signal is 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 setting, reduced as much as possible the measuring error of low discharge in ultrasonic flow meter gas flow, make measuring accuracy higher; Simultaneously by pulse signal voltage threshold values U
0reasonable setting and the acting in conjunction of signal condition module, even under noise circumstance complicated situation, also can accurately judge the received time of ultrasonic pulse signal.
3. can, through repeatedly measuring in a transmitting procedure, guarantee the accuracy of flow point.
4. when flowing through the gas flow rate of ultrasonic flow meter gas flow when larger, the sending and receiving of ultrasonic pulse signal is also subject to the interference of flow velocity, the waveform of the ultrasonic pulse signal receiving is probably submerged in a reactor noise, the measuring method providing of the present invention can be disturbed by signal condition resume module filtering noise, in the situation that noise cannot filtering by pulse signal voltage threshold values U
0reasonable setting judge effective noise.
Accompanying drawing explanation
Fig. 1 is the ultimate principle block diagram that available technology adopting supersonic technique is measured ultrasonic flow meter flow.
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, control computing unit 15, measurement timing module 20, driver module 30, sensor control module 40, signal condition module 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 module 40, signal condition module 50, ultrasonic sensor A and ultrasonic sensor B; Wherein, ultrasonic sensor A and ultrasonic sensor B are arranged on respectively the upstream and downstream of ultrasonic flow meter gas flow, to the other side, launch respectively ultrasonic signal and reception the other side's ultrasonic signal, 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, and the gas in ultrasonic flow meter gas flow is not produced to inhibition.
Described processor module 10 comprises peak detection unit 11, Pulse-trigger control unit 13 and controls computing unit 15, described peak detection unit 11 is controlled respectively computing unit 15 with Pulse-trigger control unit 13 and is 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 computing unit 15 is connected with the control signal input end of measuring timing module 20, and the testing result output terminal of measuring timing module 20 is connected with the calculating parameter input end of controlling computing unit 15; Control computing unit 15 and also there is gain adjustment control signal output terminal and transmitting-receiving ultrasound wave switch-over control signal output terminal, the gain adjustment control signal output terminal of controlling computing 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 module 40.
The peak value of the ultrasonic pulse signal that the ultrasonic sensor A that peak detection unit 11 receives for detection of ultrasonic sensor B sends, this peak transmission is to controlling computing unit, control computing unit 15 according to the gas flow that flows through ultrasonic flow meter gas flow with the relation between this peak value to amplifying unit 55 sending controling instructions, the gain of adjustment amplifying unit 55;
Pulse-trigger control unit 13 sends the time interval and the number of times of Pulse-trigger control signal for controlling computing unit 15 to measurement timing module 20; The time interval and the number of times that computing unit 15 transmits control signal controlled in preset in advance Pulse-trigger control unit 13.
Control computing unit 15 for sending Pulse-trigger control signal to measuring timing module 20; Also, for send transmitting-receiving ultrasound wave switch-over control signal to sensor control module 40, switch the state of the transmitting-receiving ultrasonic pulse signal of ultrasonic sensor A and ultrasonic sensor B; Also for sending gain to amplifying unit 55, adjust control signal, adjust the gain of amplifying unit 55; Also for when measuring the gas flow of timing module 20 transmission and ultrasonic propagation along direction, the delivery time T of ultrasound wave in Ultrasonic Wave Flowmeter runner
1, gas flow and ultrasonic propagation be during against direction, the delivery time T of ultrasound wave in Ultrasonic Wave Flowmeter runner
2, in the cross-sectional area of the transmission range by the ultrasonic pulse signal that measures in ultrasonic flow meter gas flow (be in fact ultrasonic sensor A pop one's head in to the air line distance of the probe of ultrasonic sensor B), 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 to sensor control module 40, send driving signal for controlling driver module 30, also for recording the timing of ultrasonic sensor transmitting-receiving ultrasonic pulse signal.
Driver module 30 drives signal for sending ultrasonic pulse to sensor control module 40, driver module 30 driving signal input are connected with the driving signal output part of measuring timing module 20, the driving signal output part of driver module 30 is connected with the signal input part of sensor control module 40, sensor control module 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 module 40 is sent ultrasonic pulse driving signal for controlling ultrasonic sensor A or ultrasonic sensor B, and the signal of reception is transferred to matching unit 51,
Described signal condition module 50 comprises matching unit 51, filter unit 53 and the amplifying unit 55 connecting successively; The input end communication connection of the signal output part of sensor control module 40 and matching unit 51, the signal output part of amplifying unit 55 and the signal input part communication connection of measuring timing module 20, signal condition module 50 is processed for the signal used that sonic sensor A or ultrasonic sensor B are received, 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 computing unit 15
0, U
0it is empirical value, the waveform of the ultrasonic pulse signal receiving due to ultrasonic sensor can change along with flowing through the difference of the flow of ultrasonic flow meter gas flow, want each co-current flow and counter-current flow all to test the zero crossing of same ripple, need in the process of test, monitor the scope of each peak value of ultrasonic pulse signal, choose U
0not only be no more than next peak value but also higher than peak value before, avoided the waveform testing of co-current flow and counter-current flow to different zero crossings, to cause the miscount of co-current flow and counter-current flow time, caused the wrong identification of flow.Control computing unit 15 by processor module 10 arranges the gain of amplifying unit 55 and the bandwidth of filter unit 53, control in computing unit 15 and also store the transmission range L of ultrasonic pulse signal in ultrasonic flow meter gas flow in ultrasonic flow meter, the angle of the flow direction of gas and ultrasound wave path transmission direction
, the cross-sectional area S of ultrasonic flow meter gas flow,
, S and L all can obtain by measurement;
S2: when measurement gas flows to ultrasonic propagation along direction (angle that suitable the direction in the present invention refers to ultrasonic propagation direction and the measurement gas flow direction is acute angle or zero degree), the delivery time T of ultrasound wave in Ultrasonic Wave Flowmeter runner
1, concrete steps are as follows:
S21: control computing unit 15 and send Pulse-trigger control signal to measuring timing module 20, measure timing module 20 and send driving signal according to the Pulse-trigger control signal controlling driver module 30 receiving, now, sensor control module 40 is controlled ultrasonic sensor A and is received driving signal and send ultrasonic pulse signal Us, and ultrasonic sensor B is used for receiving ripple signal Us;
S22: ultrasonic sensor A receives when driving signal and sending ultrasonic pulse signal Us, makes feedback to controlling computing unit 15, controls computing unit 15 control survey timing modules 20 and starts timing;
S23: all signals that signal condition module 50 receives ultrasonic sensor B by matching unit 51 mate, filter unit 53 carries out filtering and amplifying unit 55 amplifies processing, the noise receiving when ultrasonic sensor B is accepted to ultrasonic pulse signal Us filters, thereby the signal that has guaranteed to enter next step processing is the ultrasonic signal Us that ultrasonic sensor A sends;
S24: the signal after step S23 processes is defined as the ultrasonic pulse signal Us being sent by ultrasonic sensor A that ultrasonic sensor B receives, and is designated as Us
', peak detection unit 11 detects ultrasonic pulse signal Us
'a plurality of peak value Umaxi, by a plurality of Umaxi respectively with pulse signal voltage threshold values U
0compare, when obtaining first, be greater than pulse signal voltage threshold values U
0umaxi time, control computing unit 15 to measure timing module 20 send the beginning can stop signal, (to measuring timing module, sending the signal of preparing to stop timing), detects from first and is greater than pulse signal voltage threshold values U when measuring timing module 20
0umaxi after during N zero crossing, measure timing module and stop timing and send to controlling computing unit the feedback that stops timing, measure timing module 20 and to stopping the mistiming that timing obtains, be T from starting timing
1;
S3: when measurement gas flows to ultrasonic propagation against direction (angle that the contrary direction in the present invention refers to ultrasonic propagation direction and the measurement gas flow direction is time angle or 180 °), the delivery time T of ultrasound wave in Ultrasonic Wave Flowmeter runner
2, concrete steps are as follows:
S31: control computing unit 15 and send Pulse-trigger control signal to measuring timing module 20, measure timing module 20 and send driving signal according to the Pulse-trigger control signal controlling driver module 30 receiving, now, sensor control module 40 is controlled ultrasonic sensor B and is received driving signal and send ultrasonic pulse signal Un, and ultrasonic sensor A is used for receiving ripple signal Un;
S32: ultrasonic sensor B receives when driving signal and sending ultrasonic pulse signal Un, makes feedback to controlling computing unit 15, controls computing unit 15 and controls control survey timing module (20) beginning timing;
S33: all signals that signal condition module 50 receives ultrasonic sensor A by matching unit 51 mate, filter unit 53 carries out filtering and amplifying unit 55 amplifies processing, the noise receiving when ultrasonic sensor A is accepted to ultrasonic pulse signal Un filters, thereby the signal that has guaranteed to enter next step processing is the ultrasonic signal Us that ultrasonic sensor A sends;
S34: the signal after step S33 processes is defined as the ultrasonic pulse signal Un being sent by ultrasonic sensor B that ultrasonic sensor A receives, and is designated as Un
', peak detection unit 11 detects ultrasonic pulse signal Un
'a plurality of peak value Umaxj, by a plurality of Umaxj respectively with pulse signal voltage threshold values U
0compare, when obtaining first, be greater than pulse signal voltage threshold values U
0umaxj time, control computing unit 15 to measure timing module 20 send the beginning can stop signal, (to measuring timing module 20, sending the signal of preparing to stop timing), detects from first and is greater than pulse signal voltage threshold values U when measuring timing module 20
0umaxi after during N zero crossing, measure timing module and stop timing and send to controlling computing unit the feedback that stops timing, measure timing module 20 and to stopping the mistiming that timing obtains, be T from starting timing
2;
S4: the T2 that the T1 that measurement timing module 20 obtains S24 and S34 obtain transfers to the control computing unit 15 of processor module 10, controls computing unit 15 and calculates gas flow Q according to formula (1) and (2),
The flow velocity that in formula (1), U is gas, 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 obtain by measuring;
S5: Pulse-trigger control unit 13 is controlled computing unit 15 and sent the time interval T of Pulse-trigger control signal to measurement timing module 20
pwith number of times 2M, control computing unit 15 and just can obtain a gas flow Qi to measuring the adjacent twice Pulse-trigger control signal of timing module 20 transmission, (adjacent twice Pulse-trigger control signal makes sensor control module 40 control ultrasonic sensor A and ultrasonic sensor B once transmitting-receiving respectively, and the ultrasonic sensor A that controls the upstream be positioned at ultrasonic flow meter gas flow first sends ultrasonic pulse signal, the ultrasonic sensor B that is positioned at downstream receives; And then control the ultrasonic sensor B be positioned at downstream and send ultrasonic pulse signal, and the ultrasonic sensor A that is positioned at upstream receives.) control the flow that average that computing unit 15 calculates this M Qi obtain 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: from a ultrasonic sensor, send ultrasonic pulse signal and to another ultrasonic sensor, receive this signal and measure timing module and detect from first and be greater than pulse signal voltage threshold values U
0umaxi after timing time during N zero crossing, be minimum interval during this period of time, the time interval is because of different ultrasonic flow meters
, S and L and difference, therefore the Tp of different ultrasonic flow meters is also different.The scope of M is: between 2 ~ 128 times.
Select two ultrasonic flow meter below, adopt respectively the inventive method and time difference method to test the flow of its runner of flowing through, the results are shown in Table 1 and table 2 ultrasonic flow meter 1,
1=45 °, S1=300 mm
2and L1=150mm.
Table 1
Ultrasonic flow meter 2,
2=45 °, S2=350mm
2and L2=120mm.
Table 2
By the data in table 1 ~ 2, can find out, the error that the inventive method is measured ultrasonic flow meter is far smaller than time difference method, and the accuracy of detection of therefore visible the inventive method is higher, is subject to ectocine less.
The invention discloses a kind of flow measurement circuit of ultrasonic flow meter and the method for using this metering circuit to carry out flow measurement, at least one pair of ultrasonic sensor arranging by the upstream side at ultrasonic flow meter gas flow and interval, downstream predetermined distance carries out the sending and receiving of ultrasonic pulse signal, in travel-time according to ultrasonic pulse signal from the ultrasonic sensor of upstream side to the ultrasonic sensor in downstream, obtain the flow velocity of detected fluid in ultrasonic flow meter gas flow or/and flow.Sensor control module, it switches the both transmit and receive direction of a pair of ultrasonic sensor; Driver module, it provides the driving voltage that drives ultrasonic sensor transmitting portion; Measure timing module, it sends the time starting after ultrasonic pulse signal according to ultrasonic sensor, and is greater than pulse signal voltage threshold values U detecting from first
0umaxi after finish timing during N zero crossing, calculate a ultrasonic sensor and send ultrasonic pulse signal and to another ultrasonic sensor, receive the time of this signal; Signal condition module, its ultrasonic pulse signal that another ultrasonic sensor is received carries out filter amplifying processing; When detecting first, measurement timing module is greater than pulse signal voltage threshold values U
0the peak value of ultrasonic pulse signal after, after starting to receive zero crossing and receiving N zero crossing, stop timing, processor module, it detects the mean value of successful ultrasonic propagation time according to above-mentioned acceptance point, obtain the flow velocity of measured fluid or/and flow.
In the ultrasonic measurement circuit and method of recording in the present invention, by the peak detection unit of control module, at the peak value that exists threshold values to surpass previous ripple during lower than the peak value of this ripple, enable to receive zero cross point, the zero cross point of this ripple is detected as acceptance point, at N zero crossing, be set to the end time.When the peak value of the next ripple after detecting successfully does not surpass threshold values, be judged as cross point detection failure, give up to fall data, waiting for that transmitted detects again.
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 has been described in detail the present invention with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, the modification that those carry out technical scheme of the present invention or be equal to replacement, and do not depart from aim and the scope of the technical program, all should be encompassed in the middle of claim scope of the present invention.
Claims (1)
1. a flow-measuring method for ultrasonic flow meter, is characterized in that, concrete steps are as follows:
The upstream and downstream that ultrasonic sensor A and ultrasonic sensor B is arranged on respectively to ultrasonic flow meter gas flow, 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 computing unit (15)
0by controlling computing unit (15), the gain of amplifying unit (55) and the bandwidth of filter unit (53) are set, control in computing unit (15) and also store the transmission range L of ultrasonic pulse signal in ultrasonic flow meter gas flow in ultrasonic flow meter, the angle of the flow direction of gas and ultrasound wave path transmission direction
, the cross-sectional area S of ultrasonic flow meter gas flow,
, S and L all can obtain by measurement;
S2: when measurement gas flows to ultrasonic propagation along direction, the delivery time T of ultrasound wave in Ultrasonic Wave Flowmeter runner
1, concrete steps are as follows:
S21: the control computing unit (15) of processor module (10) sends Pulse-trigger control signal to measuring timing module (20), measure timing module (20) and send driving signal according to the Pulse-trigger control signal controlling driver module (30) receiving, now, sensor control module (40) is controlled ultrasonic sensor A and is received driving signal and send ultrasonic pulse signal Us, and ultrasonic sensor B is used for receiving ripple signal Us;
S22: ultrasonic sensor A receives when driving signal and sending ultrasonic pulse signal Us, makes feedback to controlling computing unit (15), controls computing unit (15) control survey timing module (20) and starts timing;
S23: all signals that signal condition module (50) receives ultrasonic sensor B by matching unit (51) mate, filter unit (53) carries out filtering and amplifying unit (55) amplifies processing, the noise receiving when ultrasonic sensor B is accepted to ultrasonic pulse signal Us filters;
S24: the signal after step S23 processes is defined as the ultrasonic pulse signal Us being sent by ultrasonic sensor A that ultrasonic sensor B receives, and is designated as Us
', peak detection unit (11) detects ultrasonic pulse signal Us
'a plurality of peak value Umaxi, by a plurality of Umaxi respectively with pulse signal voltage threshold values U
0compare, when obtaining first, be greater than pulse signal voltage threshold values U
0umaxi time, control computing unit (15) to measure timing module (20) send the beginning can stop signal, when measuring timing module (20), detect from first and be greater than pulse signal voltage threshold values U
0umaxi after during N zero crossing, measure timing module (20) and stop timing and send to controlling computing unit (15) feedback that stops timing, measure timing module (20) and to stopping the mistiming that timing obtains, be T from starting timing
1;
S3: when measurement gas flows to ultrasonic propagation against direction, the delivery time T of ultrasound wave in Ultrasonic Wave Flowmeter runner
2, concrete steps are as follows:
S31: control computing unit (15) and send Pulse-trigger control signal to measuring timing module (20), measure timing module (20) and send driving signal according to the Pulse-trigger control signal controlling driver module (30) receiving, now, sensor control module (40) is controlled ultrasonic sensor B and is received driving signal and send ultrasonic pulse signal Un, and ultrasonic sensor A is used for receiving ripple signal Un;
S32: ultrasonic sensor B receives when driving signal and sending ultrasonic pulse signal Un, makes feedback to controlling computing unit (15), controls computing unit (15) control survey timing module (20) and starts timing;
S33: all signals that signal condition module (50) receives ultrasonic sensor A by matching unit (51) mate, filter unit (53) carries out filtering and amplifying unit (55) amplifies processing, the noise receiving when ultrasonic sensor A is accepted to ultrasonic pulse signal Un filters;
S34: the signal after step S33 processes is defined as the ultrasonic pulse signal Un being sent by ultrasonic sensor B that ultrasonic sensor A receives, and is designated as Un
', peak detection unit (11) detects ultrasonic pulse signal Un
'a plurality of peak value Umaxj, by a plurality of Umaxj respectively with pulse signal voltage threshold values U
0compare, when obtaining first, be greater than pulse signal voltage threshold values U
0umaxj time, control computing unit (15) to measure timing module (20) send the beginning can stop signal, when measuring timing module (20), detect from first and be greater than pulse signal voltage threshold values U
0umaxi after during N zero crossing (detection that please determine N zero crossing is by peak detection unit or measuring timing module completes), measure timing module (20) and stop timing and send to controlling computing unit (15) feedback that stops timing, measure timing module (20) and to stopping the mistiming that timing obtains, be T from starting timing
2;
S4: the T2 that the T1 that measurement timing module (20) obtains S24 and S34 obtain transfers to the control computing unit (15) of processor module (10), controls computing unit (15) and calculates gas flow Q according to formula (1) and (2),
The flow velocity that in formula (1), U is gas, 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) are controlled computing unit (15) and sent the time interval T of Pulse-trigger control signal to measurement timing module (20)
pwith number of times 2M, to control computing unit (15) and send adjacent twice Pulse-trigger control signal and just can obtain a gas flow Qi to measuring timing module (20), the average that control computing unit (15) calculates this M Qi obtain the flow of ultrasonic flow meter.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103948400A (en) * | 2014-05-20 | 2014-07-30 | 夏云 | Disposable ultrasonic breathing tube |
| CN104316120A (en) * | 2014-10-28 | 2015-01-28 | 姜跃炜 | Flow detection method and system for high-precision ultrasonic flow meter |
| CN104330121A (en) * | 2014-10-28 | 2015-02-04 | 姜跃炜 | Timing pulse width division method for flow rate detection system and circuit |
| CN105115552A (en) * | 2015-04-30 | 2015-12-02 | 中国人民解放军国防科学技术大学 | Ultrasonic wave flow measuring method and device based on sidetone phase measurement |
| CN105181045A (en) * | 2015-05-22 | 2015-12-23 | 重庆川仪自动化股份有限公司 | Method for eliminating effect of temperature on acoustic velocity for ultrasonic flowmeter |
| CN105716674A (en) * | 2016-04-20 | 2016-06-29 | 成都千嘉科技有限公司 | Ultrasonic flow meter and ultrasound sending time correction method and system thereof |
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| CN106706050A (en) * | 2015-08-10 | 2017-05-24 | 杭州思筑智能设备有限公司 | Method for measuring gas flow through ultrasonic flowmeter |
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| CN107084763A (en) * | 2017-04-27 | 2017-08-22 | 上海大学 | Transit-time ultrasonic flow meter signal processing system |
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| CN103948400A (en) * | 2014-05-20 | 2014-07-30 | 夏云 | Disposable ultrasonic breathing tube |
| CN104330121B (en) * | 2014-10-28 | 2017-09-19 | 姜跃炜 | Timing pulsewidth dividing method and circuit for flow quantity detecting system |
| CN104316120A (en) * | 2014-10-28 | 2015-01-28 | 姜跃炜 | Flow detection method and system for high-precision ultrasonic flow meter |
| CN104330121A (en) * | 2014-10-28 | 2015-02-04 | 姜跃炜 | Timing pulse width division method for flow rate detection system and circuit |
| CN104316120B (en) * | 2014-10-28 | 2017-12-05 | 姜跃炜 | Flow rate testing methods and system for high-precision ultrasonic flowmeter |
| CN105115552A (en) * | 2015-04-30 | 2015-12-02 | 中国人民解放军国防科学技术大学 | Ultrasonic wave flow measuring method and device based on sidetone phase measurement |
| CN105115552B (en) * | 2015-04-30 | 2017-12-19 | 中国人民解放军国防科学技术大学 | The ultrasonic flow measuring method and device of phase are surveyed based on sidetone |
| CN105181045A (en) * | 2015-05-22 | 2015-12-23 | 重庆川仪自动化股份有限公司 | Method for eliminating effect of temperature on acoustic velocity for ultrasonic flowmeter |
| CN105181045B (en) * | 2015-05-22 | 2018-04-20 | 重庆川仪自动化股份有限公司 | Ultrasonic flowmeter, which eliminates temperature, influences the method for the velocity of sound |
| CN106643930A (en) * | 2015-08-10 | 2017-05-10 | 杭州思筑智能设备有限公司 | Improved ultrasonic flowmeter |
| CN106706050A (en) * | 2015-08-10 | 2017-05-24 | 杭州思筑智能设备有限公司 | Method for measuring gas flow through ultrasonic flowmeter |
| CN106706050B (en) * | 2015-08-10 | 2019-03-19 | 杭州思筑智能设备有限公司 | A method of utilizing ultrasonic flow rate measurement amount gas flow |
| CN106643930B (en) * | 2015-08-10 | 2019-03-19 | 杭州思筑智能设备有限公司 | A kind of improved ultrasonic flowmeter |
| CN106932038A (en) * | 2015-12-30 | 2017-07-07 | 浙江大学 | A kind of time detecting method for improving transit-time ultrasonic flow meter antijamming capability |
| CN105716674B (en) * | 2016-04-20 | 2020-06-23 | 成都千嘉科技有限公司 | Ultrasonic transmission time correction method and system of ultrasonic flowmeter and flowmeter |
| CN105716674A (en) * | 2016-04-20 | 2016-06-29 | 成都千嘉科技有限公司 | Ultrasonic flow meter and ultrasound sending time correction method and system thereof |
| CN106679746B (en) * | 2016-12-08 | 2019-07-26 | 深圳市锐能微科技股份有限公司 | Ultrasound speed variator and its speed-measuring method |
| CN106679746A (en) * | 2016-12-08 | 2017-05-17 | 深圳市锐能微科技股份有限公司 | Ultrasonic speed measuring device and speed measuring method thereof |
| CN107084763B (en) * | 2017-04-27 | 2019-11-19 | 上海大学 | Transit-time ultrasonic flow meter signal processing system |
| CN107084763A (en) * | 2017-04-27 | 2017-08-22 | 上海大学 | Transit-time ultrasonic flow meter signal processing system |
| CN107490409A (en) * | 2017-08-09 | 2017-12-19 | 辽宁航宇星物联仪表科技有限公司 | A kind of family ultrasonic water meter mistake proofing ripple improved method |
| CN113063467A (en) * | 2021-04-28 | 2021-07-02 | 哈勃智能传感(深圳)有限公司 | Sensor-based oxygen concentration and effective flow measuring method and storage medium |
| CN113558659A (en) * | 2021-07-30 | 2021-10-29 | 重庆安酷科技有限公司 | High-precision ultrasonic lung function detector and detection method thereof |
| CN113558659B (en) * | 2021-07-30 | 2023-07-04 | 重庆安酷科技有限公司 | High-precision ultrasonic lung function detector and detection method thereof |
| CN114018349A (en) * | 2021-10-19 | 2022-02-08 | 苏州大学 | Gas flow measuring device, measuring system and measuring method based on ultrasonic waves |
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