CN101162164A - Frequency modulation wave marking method for time-difference process ultrasonic flowmeter - Google Patents
Frequency modulation wave marking method for time-difference process ultrasonic flowmeter Download PDFInfo
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- CN101162164A CN101162164A CNA2007101568820A CN200710156882A CN101162164A CN 101162164 A CN101162164 A CN 101162164A CN A2007101568820 A CNA2007101568820 A CN A2007101568820A CN 200710156882 A CN200710156882 A CN 200710156882A CN 101162164 A CN101162164 A CN 101162164A
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Abstract
The present invention relates to a frequency modulation waveform marking method of time difference method ultrasonic flowmeter, and is used to measure the transmitting time of an ultrasonic signal in the fluid medium, thereby measuring the flow speed and the flow capacity of medium. The method provided by the invention has the following procedures: (1) frequency variation is overlaid on transducer operating frequency to form an emitting signal; (2) the emitting signal carries the information of flow speed when the fluid medium transmits; (3) signals are collected on a receiving transducer terminal; the frequency variation signals are demodulated and have related calculation with the original frequency variation signals in the procedure one; (4) according to the related function peak value, the signal transmitting time is calculated to gain the flow speed and the flow capacity. The frequency variation provided by the invention can be achieved through overlaying frequency deviation on transducer resonance central frequency; the frequency after overlaid is in the operation bandwidth of the transducer; the invention has the advantages of having no interference by signal amplitude fluctuation and flow and of achieving the signal transmitting time with high measuring precision.
Description
Technical field
The invention belongs to the transit-time ultrasonic flow meter category, relate in particular to a kind of frequency modulation (PFM) waveform labeling method of ultrasonic flow meter.
Background technology
Ultrasonic flow meter is compared with traditional flowmeter, and no movable member, no crushing, traceability are good, cost is insensitive to the bore change, and therefore local clear superiority aspect middle large-caliber flow measurement is promoted very fast in recent years aspect gasmetry.Owing to reasons such as ultrasonic signal decay in the gas are serious, the sound transmission rate of gas and ultrasonic transducer is low, make it aspect gas flow measurement, still have more problem, generally be difficult to reach the measuring accuracy in the liquid measure.
The main precision disturbing factor of transit time ultrasonic flow meters comprises: (1) ultrasound wave waveform is in the gas transmission course, and decay is serious, and amplitude is subjected to flow rate effect big, and traditional threshold method and zero passage method are difficult to realize in conjunction with measuring the time difference; (2) built-in velocity distribution model has deviation in distribution of the actual flow velocity of inside, flow field and the flowmeter, causes model error.
Summary of the invention
The problem that the present invention mainly solves is the time difference measurement problem that the signal waveform amplitude instability in the time difference method gas ultrasonic flow meter flow detection is brought.
In order to reach above goal of the invention, the technical solution used in the present invention is: the frequency that transmits changes and the correlation method flow measurement in the transducer bandwidth scope, and step is as follows:
(1) utilize high speed processor superposition frequency variation on transducer resonance centre frequency, generation transmits, and the frequency variation cycle request of superposition is greater than the transducer pulse propagation theoretical maximum time;
(2) transmit and in fluid media (medium) propagation process, carry flowing information;
(3) in receiving transducer end acquired signal, the frequency variation numerical value that the change part numerical value that wherein departs from transducer resonance centre frequency is used during with emission carries out related operation;
(4) according to the peak of related function calculate unidirectional the transit time, after obtaining the two-way transit time, thereby promptly obtaining the time difference obtains flow velocity and flow information.
Frequency variation of superposition is encoded and is transmitted on the described employing centre frequency, realizes mark and location to the transducer waveform.
The beneficial effect that the present invention has is:
(1) the present invention does not need directly to measure because the small transit time variation of receiving and transmitting signal that fluid flows and causes;
(2) signal that is used for related operation is the numerical value of frequency variation, but not the original excitation signal on the transducer frequency of operation, and because the frequency of original excitation signal is a fixed value, on signal Processing, allow to use to owe sampling processing, reduce requirement to sample frequency.
(3) core among the present invention is the change (frequency modulation) of frequency, and is insensitive for signal waveform amplitude variable, avoided adopting traditional threshold method and zero passage detection in conjunction with measuring the harsh requirement of the time difference to stability of waveform and signal to noise ratio (S/N ratio).
Description of drawings
Fig. 1 is the measurement of correlation schematic diagram.
Fig. 2 is a correlation method flow measurement principle schematic of the present invention.
Fig. 3 is a frequency modulation (PFM) waveform labeling method synoptic diagram of the present invention.
Specific implementation method
The present invention proposes to use frequency variation of superposition on transducer work centre frequency, utilizes the frequency variation correlation properties of emission and acknowledge(ment) signal to come mark waveform due in, measures the transit time between hyperacoustic the transmitting and receiving.Because what serve as a mark in the related operation mainly is the change of frequency, the amplitude that has waveform signal changes insensitive characteristics, can significantly reduce the requirement to Signal-to-Noise.
Implementation step is as follows:
(1) producing frequency as high speed processor that Fig. 2 adopts is transmitting of f (t)+Δ f (t), and wherein f (t) is the transducer resonant frequency, and Δ f (t) is predefined frequency variation.This process is equivalent to carry out a frequency modulation (PFM) to sending signal, adopts the emission of this method acquisition and receives waveform as shown in Figure 3.
(2) high speed processor produces and the corresponding frequency variation sequence of values of Δ f (t) signal when generation transmits.This process is equivalent to produce the preceding random fluctuation signal of step (1) modulation.
(3) signal that receiving transducer is received carries out demodulation, recovers frequency variation signal delta f (t-τ) wherein, τ wherein be received signal and transmit between time.
(4) as Fig. 1 two frequency variation sequence of values are carried out related operation, the mistiming that obtains both is the transit time τ of signal between transmission and receiving transducer.
(5) record transit time of following current and adverse current both direction respectively, the time difference that can obtain to propagate, thus obtain flow rate of fluid and flow.
Claims (2)
1. the frequency modulation (PFM) waveform labeling method of a transit-time ultrasonic flow meter is characterized in that, the frequency that transmits changes and the correlation method flow measurement in the transducer bandwidth scope, and step is as follows:
(1) utilize high speed processor superposition frequency variation on transducer resonance centre frequency, generation transmits, and the frequency variation cycle request of superposition is greater than the transducer pulse propagation theoretical maximum time;
(2) transmit and in fluid media (medium) propagation process, carry flowing information;
(3) in receiving transducer end acquired signal, the frequency variation numerical value that the change part numerical value that wherein departs from transducer resonance centre frequency is used during with emission carries out related operation;
(4) according to the peak of related function calculate unidirectional the transit time, after obtaining the two-way transit time, thereby promptly obtaining the time difference obtains flow velocity and flow information.
2. according to the described frequency modulation (PFM) waveform labeling method that gets transit-time ultrasonic flow meter of claim 1, it is characterized in that frequency variation of superposition is encoded and transmitted on the employing centre frequency, realizes mark and location to the transducer waveform.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2007101568820A CN101162164A (en) | 2007-11-16 | 2007-11-16 | Frequency modulation wave marking method for time-difference process ultrasonic flowmeter |
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| CNA2007101568820A CN101162164A (en) | 2007-11-16 | 2007-11-16 | Frequency modulation wave marking method for time-difference process ultrasonic flowmeter |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102103147A (en) * | 2011-01-05 | 2011-06-22 | 王毅 | Ultrasonic autocorrelation transverse flow velocity measuring method |
| CN102549394A (en) * | 2009-09-30 | 2012-07-04 | 松下电器产业株式会社 | Flow rate measuring device |
| CN102589626A (en) * | 2012-01-20 | 2012-07-18 | 北京嘉洁能科技有限公司 | High-resolution time measurement and processing device and measurement method thereof |
| CN103076057A (en) * | 2013-01-05 | 2013-05-01 | 北京乾达源科技有限公司 | Multiphase flow flowmeter |
| CN103162752A (en) * | 2013-02-06 | 2013-06-19 | 南京理工大学 | Detection device and method for phase encoding synchronous time difference of ultrasonic flowmeter |
| CN103389153A (en) * | 2013-08-02 | 2013-11-13 | 浙江理工大学 | Ultrasonic wave transit time measuring circuit by secondary reflection waves |
| CN103471668A (en) * | 2013-09-23 | 2013-12-25 | 浙江理工大学 | Circuit for measuring transition time of ultrasonic wave by increasing voltage excitation step by step |
| CN107014447A (en) * | 2015-10-21 | 2017-08-04 | 德州仪器公司 | The ultrasonic transducer system and method responded using broadband system |
| CN108458758A (en) * | 2018-01-08 | 2018-08-28 | 电子科技大学 | A kind of novel supersonic flow flowmeter body and the method for measuring fluid flow rate |
| CN110383076A (en) * | 2017-03-10 | 2019-10-25 | 萨基姆通讯能源及电信联合股份公司 | Method for measuring fluid velocity |
| CN110400360A (en) * | 2019-07-25 | 2019-11-01 | 北京航空航天大学 | A kind of sound wave transition time detection method based on full convolutional neural networks |
| CN110646636A (en) * | 2019-10-11 | 2020-01-03 | 电子科技大学 | Multifunctional ultrasonic anemometer |
| CN111220816A (en) * | 2020-01-19 | 2020-06-02 | 中船重工海声科技有限公司 | Time difference type ultrasonic flow velocity measuring method adopting frequency hopping signal |
| CN112639412A (en) * | 2019-03-14 | 2021-04-09 | 欧姆龙株式会社 | Flow rate measuring device |
| CN113671215A (en) * | 2021-07-30 | 2021-11-19 | 苏州斯威高科信息技术有限公司 | Measurement and calibration method and system for improving precision of ultrasonic wind sensor |
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2007
- 2007-11-16 CN CNA2007101568820A patent/CN101162164A/en active Pending
Cited By (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102549394A (en) * | 2009-09-30 | 2012-07-04 | 松下电器产业株式会社 | Flow rate measuring device |
| CN102549394B (en) * | 2009-09-30 | 2014-02-19 | 松下电器产业株式会社 | Flow rate measuring device |
| CN102103147A (en) * | 2011-01-05 | 2011-06-22 | 王毅 | Ultrasonic autocorrelation transverse flow velocity measuring method |
| CN102103147B (en) * | 2011-01-05 | 2012-04-18 | 王毅 | Ultrasonic autocorrelation transverse flow velocity measuring method |
| CN102589626A (en) * | 2012-01-20 | 2012-07-18 | 北京嘉洁能科技有限公司 | High-resolution time measurement and processing device and measurement method thereof |
| CN102589626B (en) * | 2012-01-20 | 2015-06-17 | 北京嘉洁能科技有限公司 | High-resolution time measurement and processing device and measurement method thereof |
| CN103076057A (en) * | 2013-01-05 | 2013-05-01 | 北京乾达源科技有限公司 | Multiphase flow flowmeter |
| CN103076057B (en) * | 2013-01-05 | 2015-09-16 | 北京乾达源科技有限公司 | A kind of multiphase flow flowmeter |
| CN103162752A (en) * | 2013-02-06 | 2013-06-19 | 南京理工大学 | Detection device and method for phase encoding synchronous time difference of ultrasonic flowmeter |
| CN103389153A (en) * | 2013-08-02 | 2013-11-13 | 浙江理工大学 | Ultrasonic wave transit time measuring circuit by secondary reflection waves |
| CN103471668A (en) * | 2013-09-23 | 2013-12-25 | 浙江理工大学 | Circuit for measuring transition time of ultrasonic wave by increasing voltage excitation step by step |
| CN103471668B (en) * | 2013-09-23 | 2016-04-06 | 浙江理工大学 | The circuit of ultrasonic time of flight is measured in a kind of excitation of boosted voltage step by step |
| CN107014447A (en) * | 2015-10-21 | 2017-08-04 | 德州仪器公司 | The ultrasonic transducer system and method responded using broadband system |
| CN107014447B (en) * | 2015-10-21 | 2020-05-26 | 德州仪器公司 | Ultrasonic transducer system and method using broadband system response |
| US11209297B2 (en) | 2015-10-21 | 2021-12-28 | Texas Instruments Incorporated | Ultrasonic transducer system and method using broadband system responses |
| CN110383076A (en) * | 2017-03-10 | 2019-10-25 | 萨基姆通讯能源及电信联合股份公司 | Method for measuring fluid velocity |
| CN108458758A (en) * | 2018-01-08 | 2018-08-28 | 电子科技大学 | A kind of novel supersonic flow flowmeter body and the method for measuring fluid flow rate |
| CN112639412A (en) * | 2019-03-14 | 2021-04-09 | 欧姆龙株式会社 | Flow rate measuring device |
| CN110400360A (en) * | 2019-07-25 | 2019-11-01 | 北京航空航天大学 | A kind of sound wave transition time detection method based on full convolutional neural networks |
| CN110646636A (en) * | 2019-10-11 | 2020-01-03 | 电子科技大学 | Multifunctional ultrasonic anemometer |
| CN111220816A (en) * | 2020-01-19 | 2020-06-02 | 中船重工海声科技有限公司 | Time difference type ultrasonic flow velocity measuring method adopting frequency hopping signal |
| CN111220816B (en) * | 2020-01-19 | 2022-04-08 | 中船重工海声科技有限公司 | Time difference type ultrasonic flow velocity measuring method adopting frequency hopping signal |
| CN113671215A (en) * | 2021-07-30 | 2021-11-19 | 苏州斯威高科信息技术有限公司 | Measurement and calibration method and system for improving precision of ultrasonic wind sensor |
| CN113671215B (en) * | 2021-07-30 | 2024-02-20 | 苏州斯威高科信息技术有限公司 | Measurement and calibration method and system for improving accuracy of ultrasonic wind sensor |
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