CN104748805A - Ultrasonic flow measurement method based on direct phase difference - Google Patents
Ultrasonic flow measurement method based on direct phase difference Download PDFInfo
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- CN104748805A CN104748805A CN201510168011.5A CN201510168011A CN104748805A CN 104748805 A CN104748805 A CN 104748805A CN 201510168011 A CN201510168011 A CN 201510168011A CN 104748805 A CN104748805 A CN 104748805A
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- phase difference
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Abstract
The invention provides an ultrasonic flow measurement method based on a direct phase difference. The method is characterized by transmitting ultrasonic signals by adopting a forward ultrasonic transducer and a reverse ultrasonic transducer, receiving concurrent waveforms and countercurrent waveforms, and obtaining direct phase difference waveforms between the concurrent waveforms and the countercurrent waveforms; converting a pulse signal with a changed duty ratio into a voltage signal through a calculus circuit by virtue of the phase difference waveform; and then detecting the magnitude of the voltage to obtain the flow velocity through an ADC (Analog to Digital Converter) switching circuit. The ultrasonic flow measurement method provided by the invention is high in measurement resolution ratio, strong in anti-jamming capability and better in temperature stability.
Description
Technical field
The present invention relates to a kind of ultrasonic flow measuring method, belong to ultrasonic detecting technology field.
Background technology
There is several measuring ultrasonic wave flow circuit arrangement in the market, mainly contain special chip measuring ultrasonic wave flow and discrete device measuring ultrasonic wave flow method.Chip flow measurement measures the small time by the not circuit time delay of chip internal, then flow is calculated by forward and reverse absolute time difference, this chip method is because need crawl first ultrasonic pulse to be used as reference, and ultrasonic signal first ripple received is often very little, what after receiving interference, possibly cannot be stable grabs first pulse signal, causes poor stability.
Existing discrete device scheme is then phase differential by obtaining between forward ultrasonic pulse and full sized pules and water velocity that between reverse ultrasound pulse and full sized pules, the difference of the differential aggregate-value that phase differential obtains obtains, and its principle as shown in Figure 1.When the temperature is changed, the change of ultrasonic velocity causes the relative displacement of ultrasound wave phase place to make ultrasonic measurement also there is the phenomenon of jumping ripple to this method, thus causes quantification stability poor.
Summary of the invention
The object of the present invention is to provide the ultrasonic flow measuring method based on Direct Phase difference that a kind of Measurement Resolution is high, antijamming capability is strong.
For achieving the above object, present invention employs following technical proposals:
A kind of ultrasonic flow measuring method based on Direct Phase difference, it is characterized in that, adopt forward and reverse ultrasonic transducer to send ultrasonic signal simultaneously, receive following current waveform and adverse current waveform, and draw the Direct Phase difference waveform between following current waveform and adverse current waveform, the pulse signal of change in duty cycle is become a voltage signal by an infinitesimal analysis circuit by phase differential waveform, then detect the height of this voltage by ADC change-over circuit thus obtain the speed of flow velocity, thus obtaining the size of flow.
Advantage of the present invention:
1. Measurement Resolution is high: due to measurement is very short phase time difference (under 1MHz ultrasonic frequency, being no more than 1us), within theoretical resolution can reach 30ps.
2. control interference performance strong: owing to being after waveform stabilization, the waveform therefrom taking out 10 clock period is measured, and is phase method, substantially not by the impact of Received signal strength amplitude.Only can measure compared to direct time difference method and receive in waveform several unstable wave shape before just starting of oscillation, the method has a clear superiority in anti-interference.
3. circuit is simpler: Direct Phase difference method is only relevant with adverse current waveform to following current waveform, and it doesn't matter with reference waveform, decreases circuit component, simplifies circuit.
4. temperature stability is better: when existing discrete scheme current are motionless, following current waveform phase varies with temperature and changes, and cause the signal transacting obtained to bother very much, and flow measurement fluctuating error is affected, and causes bad stability.And Direct Phase difference method, during temperature variation, following current waveform and adverse current waveform are synchronous changes, and only when fluctuations in discharge, concurrent-countercurrent phase differential waveform just can change, thus drastically increases the stability of flow measurement.
Accompanying drawing explanation
Fig. 1 is existing discrete device flow measurement waveform schematic diagram.
Fig. 2 is Direct Phase of the present invention difference method flow measurement schematic diagram.
Embodiment
For the ease of understanding, illustrate the present invention in detail further below in conjunction with specific embodiment.
For treating fluid measured, just adopt, reverse ultrasound transducer sends ultrasonic signal simultaneously, receive following current waveform and adverse current waveform, and draw Direct Phase difference waveform (as oscillogram Fig. 2) between following current waveform and adverse current waveform, the size of the dutycycle of phase differential waveform has directly reacted the speed of flow velocity, the flow velocity of the wider so directly reaction of dutycycle is faster, the pulse signal of this change in duty cycle just can be become a voltage signal by an infinitesimal analysis circuit by this phase differential waveform, waveform pulse dutycycle more Width funtion is then higher, dutycycle is less, voltage is lower, then detect the height of this voltage by ADC change-over circuit thus obtain the speed of flow velocity, so just can obtain the size of flow.This size is only relevant with the speed of water flow velocity, and causes waveform saltus step etc. to have nothing to do with the sonic velocity change of other factors as temperature causes, therefore Measurement sensibility is improved.
Claims (1)
1. the ultrasonic flow measuring method based on Direct Phase difference, it is characterized in that, adopt forward and reverse ultrasonic transducer to send ultrasonic signal simultaneously, receive following current waveform and adverse current waveform, and draw the Direct Phase difference waveform between following current waveform and adverse current waveform, the pulse signal of change in duty cycle is become a voltage signal by an infinitesimal analysis circuit by phase differential waveform, then detect the height of this voltage by ADC change-over circuit thus obtain the speed of flow velocity, thus obtaining the size of flow.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510168011.5A CN104748805A (en) | 2015-04-10 | 2015-04-10 | Ultrasonic flow measurement method based on direct phase difference |
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| CN201510168011.5A CN104748805A (en) | 2015-04-10 | 2015-04-10 | Ultrasonic flow measurement method based on direct phase difference |
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| CN104748805A true CN104748805A (en) | 2015-07-01 |
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| CN201510168011.5A Pending CN104748805A (en) | 2015-04-10 | 2015-04-10 | Ultrasonic flow measurement method based on direct phase difference |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107290564A (en) * | 2017-07-28 | 2017-10-24 | 电子科技大学 | A kind of ultrasonic flow-velocity measuring method based on phase difference |
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| JPH07167695A (en) * | 1993-12-16 | 1995-07-04 | Kubota Corp | Measuring method for flowing velocity in tube using ultrasonic current meter |
| CN201255644Y (en) * | 2008-08-08 | 2009-06-10 | 国网电力科学研究院 | Synchronous transceiving time difference type supersonic flowmeter |
| CN201828295U (en) * | 2010-10-28 | 2011-05-11 | 利尔达科技有限公司 | Phase difference type ultrasonic wave flow metering device |
| CN202383152U (en) * | 2011-12-29 | 2012-08-15 | 天津市求精科技发展有限公司 | Measuring device with upstream and downstream sensors oppositely and synchronously transmitting and receiving ultrasonic wave |
| CN103090916A (en) * | 2013-02-22 | 2013-05-08 | 呼和浩特市睿城科技有限责任公司 | Ultrasonic flow measurement device and ultrasonic flow measurement method |
| CN103389133A (en) * | 2013-07-26 | 2013-11-13 | 浙江理工大学 | High-response speed ultrasonic flowmeter |
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2015
- 2015-04-10 CN CN201510168011.5A patent/CN104748805A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07167695A (en) * | 1993-12-16 | 1995-07-04 | Kubota Corp | Measuring method for flowing velocity in tube using ultrasonic current meter |
| CN201255644Y (en) * | 2008-08-08 | 2009-06-10 | 国网电力科学研究院 | Synchronous transceiving time difference type supersonic flowmeter |
| CN201828295U (en) * | 2010-10-28 | 2011-05-11 | 利尔达科技有限公司 | Phase difference type ultrasonic wave flow metering device |
| CN202383152U (en) * | 2011-12-29 | 2012-08-15 | 天津市求精科技发展有限公司 | Measuring device with upstream and downstream sensors oppositely and synchronously transmitting and receiving ultrasonic wave |
| CN103090916A (en) * | 2013-02-22 | 2013-05-08 | 呼和浩特市睿城科技有限责任公司 | Ultrasonic flow measurement device and ultrasonic flow measurement method |
| CN103389133A (en) * | 2013-07-26 | 2013-11-13 | 浙江理工大学 | High-response speed ultrasonic flowmeter |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107290564A (en) * | 2017-07-28 | 2017-10-24 | 电子科技大学 | A kind of ultrasonic flow-velocity measuring method based on phase difference |
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Application publication date: 20150701 |