CN102889910B - Ultrasonic flow instrument circuit system for preventing miswave interference - Google Patents
Ultrasonic flow instrument circuit system for preventing miswave interference Download PDFInfo
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- CN102889910B CN102889910B CN201210435609.2A CN201210435609A CN102889910B CN 102889910 B CN102889910 B CN 102889910B CN 201210435609 A CN201210435609 A CN 201210435609A CN 102889910 B CN102889910 B CN 102889910B
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Abstract
The invention relates to an ultrasonic flow instrument circuit system for preventing miswave interference. The ultrasonic flow instrument circuit system comprises a singlechip module, a voltage comparing module, a signal shielding module, a water inlet end ultrasonic transducer and a water outlet end ultrasonic transducer, wherein the singlechip module controls the voltage comparing module, the signal shielding module, the water inlet end ultrasonic transducer and the water outlet end ultrasonic transducer. According to a control method, the first time measurement is used for locating a position of an ultrasonic signal and completely shielding interference signals before the ultrasonic signal occurs, and the second time measurement is used for accurately measuring the flying time of the ultrasonic signal and solving the time difference of the ultrasonic signal. The ultrasonic flow instrument circuit system has the effects that by using the principle that the ultrasonic signal velocity in a water direction is higher and the flying time is shorter and adopting a method for measuring the ultrasonic flying time in two steps, the time different of an ultrasonic flow instrument signal can be accurately measured, miswave interference is avoided, and the accuracy and the stability of an ultrasonic flow instrument are improved.
Description
Technical field
The present invention relates to a kind of Time-difference Ultrasonic Flow appliance circuit, particularly a kind of ultrasonic flow appliance circuit system of mistake proofing wave interference.
Background technology
Time-difference Ultrasonic Flow instrument is in the time of flow measurement, and because ultrasonic signal is interfered in the time transmitting, signal amplitude produces fluctuation, may produce wrong wave interference, causes flow measurement mistake.Current solution is to reject Min-max or by automatic gain control ultrasonic signal amplitude by digital filtering mostly.Last method can cause valid data amount to reduce, flow measurement accuracy and bad stability, and a rear method mostly adopts the automatic gain control circuit of delay, and accurate ride gain in the situation that having bursty interference, causes wrong wave interference.These two kinds of circuit arrangements all can not the perfect wrong wave interference problem that solves ultrasonic flow instrument.
Summary of the invention
In view of the deficiency that prior art exists, the invention provides a kind of ultrasonic flow appliance circuit system of mistake proofing wave interference.This system adopts dynamic electric voltage comparison, and measures at twice the method for operating of ultrasonic signal time, can accurately record the waveform of ultrasonic flow meter signal, avoids wrong wave interference, to improve accuracy and the stability of ultrasonic flow instrument.
The technical scheme that the present invention adopted is for achieving the above object: a kind of ultrasonic flow appliance circuit system of mistake proofing wave interference, it is characterized in that: formed one-chip computer module control voltage comparison module, signal shielding module, water inlet end ultrasonic transducer and water side ultrasonic transducer by single-chip microcomputer, voltage comparison module, signal shielding module, water inlet end ultrasonic transducer, water side ultrasonic transducer; Concrete control method is to measure first for the first time, receive ultrasound wave by one-chip computer module control water inlet end ultrasonic transducer transmitting ultrasound wave, water side ultrasonic transducer, the interference that the ultrasound wave of signalization shroud module shielding simultaneously transmits, and the comparative voltage of controlling voltage comparison module is high voltage V1, measure hyperacoustic flight time T1; Measure for the second time again, receive ultrasound wave by one-chip computer module control water inlet end ultrasonic transducer transmitting ultrasound wave, water side ultrasonic transducer, all signals in the signalization shroud module shielding T1 time simultaneously, and the comparative voltage of controlling voltage comparison module is mid-point voltage V2, measure hyperacoustic flight time T2; Then receive ultrasound wave by one-chip computer module control water side ultrasonic transducer transmitting ultrasound wave, water inlet end ultrasonic transducer, all signals in the signalization shroud module shielding T2 time simultaneously, and the comparative voltage of controlling voltage comparison module is mid-point voltage V2, measure hyperacoustic flight time T3, by the poor calculated flow rate value of T2 and T3.
The invention has the beneficial effects as follows, this Circuits System utilizes the ultrasonic signal velocity of propagation of water (flow) direction faster, the principle that flight time is shorter, adopt the method for measuring at twice the ultrasound wave flight time, can accurately record the time difference of ultrasonic flow meter signal, avoid wrong wave interference, improved accuracy and the stability of ultrasonic flow instrument.
Brief description of the drawings
Fig. 1 is system block diagram of the present invention;
Fig. 2 is the present invention's one application example circuit diagram.
Embodiment
Below in conjunction with accompanying drawing and example, the present invention is further described.
As shown in Figure 1, a kind of ultrasonic flow appliance circuit system of mistake proofing wave interference, formed Single-chip Controlling voltage comparison module, signal shielding module, water inlet end ultrasonic transducer and water side ultrasonic transducer by single-chip microcomputer, voltage comparison module, signal shielding module, water inlet end ultrasonic transducer, water side ultrasonic transducer; Concrete control method is to measure first for the first time, receive ultrasound wave by Single-chip Controlling water inlet end ultrasonic transducer transmitting ultrasound wave, water side ultrasonic transducer, the interference that the ultrasound wave of signalization shroud module shielding simultaneously transmits, and the comparative voltage of controlling voltage comparison module is high voltage V1, measure hyperacoustic flight time T1; Measure for the second time again, receive ultrasound wave by Single-chip Controlling water inlet end ultrasonic transducer transmitting ultrasound wave, water side ultrasonic transducer, all signals in the signalization shroud module shielding T1 time simultaneously, and the comparative voltage of controlling voltage comparison module is mid-point voltage V2, measure hyperacoustic flight time T2; Then receive ultrasound wave by Single-chip Controlling water side ultrasonic transducer transmitting ultrasound wave, water inlet end ultrasonic transducer, all signals in the signalization shroud module shielding T2 time simultaneously, and the comparative voltage of controlling voltage comparison module is mid-point voltage V2, measure hyperacoustic flight time T3, by the poor calculated flow rate value of T2 and T3.
This Circuits System first judges roughly signal location with high comparative voltage, then by the interference shielding before signal, with the accurately hyperacoustic flight time T2 of measurement of low comparative voltage; And utilize the ultrasonic signal velocity of propagation of water (flow) direction faster, the principle that the flight time is shorter, by the signal shielding before T2, accurately measures the ultrasonic signal flight time T1 of flow path direction against the current, tries to achieve difference; This method of measuring at twice the ultrasound wave flight time, can accurately record the time difference signal of ultrasonic flow meter, avoids wrong wave interference, has improved accuracy and the stability of ultrasonic flow instrument.This system is applicable to the Time-difference Ultrasonic Flow measurement instrument that ultrasound wave flight time difference is less than a ultrasound wave cycle.
Fig. 2 is the present invention's one application example circuit diagram, this main circuit chip U1(TDC-GP21) integrated signal shielding module and voltage comparison module; 5 pin of master chip U1 tap into water end (W.E.) ultrasonic transducer by resistance R 2, control water inlet end ultrasonic transducer transmitting ultrasonic signal, 6 pin of master chip U1 pick out water end (W.E.) ultrasonic transducer by resistance R 3, control water side ultrasonic transducer transmitting ultrasonic signal; Water inlet end ultrasonic transducer connects 30 pin of master chip U1 by capacitor C 7, the ultrasonic signal receiving is sent into signal shielding module, water side ultrasonic transducer connects 27 pin of master chip U1 by capacitor C 9, the ultrasonic signal receiving is sent into signal shielding module; The internal signal shroud module of master chip U1 is connected with voltage comparison module, is connected with the IO mouth of single-chip microcomputer by 8 pin, 9 pin, 10 pin, 11 pin, 12 pin, 13 pin, and by Single-chip Controlling master chip, U1 works.Specific works process is: measure for the first time, control water inlet end ultrasonic transducer transmitting ultrasound wave, water side ultrasonic transducer reception ultrasound wave by single-chip microcomputer by master chip U1, by chip U1 voltage 7mV is set, measure hyperacoustic flight time T1 simultaneously; Measure for the second time again, control water inlet end ultrasonic transducer transmitting ultrasound wave, water side ultrasonic transducer reception ultrasound wave by single-chip microcomputer by master chip U1, simultaneously by all signals in the master chip U1 signal shielding module shielding T1 time are set, and the comparative voltage of controlling voltage comparison module is 0V, measure hyperacoustic flight time T2; Then control water side ultrasonic transducer transmitting ultrasound wave, water inlet end ultrasonic transducer reception ultrasound wave by single-chip microcomputer by master chip U1, simultaneously by all signals in the master chip U1 signal shielding module shielding T2 time are set, and the comparative voltage of controlling voltage comparison module is 0V, measure hyperacoustic flight time T3, by the poor calculated flow rate value of T2 and T3.
Time measurement is for the first time for having located the position of ultrasonic signal, to there is the undesired signal before ultrasonic signal all to shield, measure for the second time again, the flight time that this time can measure accurate measurement and measured ultrasonic signal, and try to achieve time difference of ultrasonic signal, after tested, adopt after the method, can not occur again wrong wave interference problem.
Claims (1)
1. the ultrasonic flow appliance circuit system of a mistake proofing wave interference, by single-chip microcomputer, voltage comparison module, signal shielding module, water inlet end ultrasonic transducer, water side ultrasonic transducer composition, one-chip computer module control voltage comparison module, signal shielding module, water inlet end ultrasonic transducer and water side ultrasonic transducer, it is characterized in that: the concrete control method of this system is to measure first for the first time, by one-chip computer module control water inlet end ultrasonic transducer transmitting ultrasound wave, water side ultrasonic transducer receives ultrasound wave, the interference that the ultrasound wave of signalization shroud module shielding simultaneously transmits, and the comparative voltage of controlling voltage comparison module is high voltage V1, measure hyperacoustic flight time T1, measure for the second time again, receive ultrasound wave by one-chip computer module control water inlet end ultrasonic transducer transmitting ultrasound wave, water side ultrasonic transducer, all signals in the signalization shroud module shielding T1 time simultaneously, and the comparative voltage of controlling voltage comparison module is mid-point voltage V2, measure hyperacoustic flight time T2, then receive ultrasound wave by one-chip computer module control water side ultrasonic transducer transmitting ultrasound wave, water inlet end ultrasonic transducer, all signals in the signalization shroud module shielding T2 time simultaneously, and the comparative voltage of controlling voltage comparison module is mid-point voltage V2, measure hyperacoustic flight time T3, by the poor calculated flow rate value of T2 and T3.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210435609.2A CN102889910B (en) | 2012-11-05 | 2012-11-05 | Ultrasonic flow instrument circuit system for preventing miswave interference |
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| CN201210435609.2A CN102889910B (en) | 2012-11-05 | 2012-11-05 | Ultrasonic flow instrument circuit system for preventing miswave interference |
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| CN102889910A CN102889910A (en) | 2013-01-23 |
| CN102889910B true CN102889910B (en) | 2014-06-04 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108007509B (en) * | 2016-10-27 | 2020-01-07 | 龙芯中科技术有限公司 | Fluid flow measurement system |
| CN107607168B (en) * | 2017-07-25 | 2021-04-09 | 辽宁航宇星物联仪表科技有限公司 | Household ultrasonic water meter self-adaption method |
| CN107490409B (en) * | 2017-08-09 | 2020-07-21 | 辽宁航宇星物联仪表科技有限公司 | Improved method for preventing wave error of household ultrasonic water meter |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2259619Y (en) * | 1995-10-13 | 1997-08-13 | 同济大学 | Ultrasonic velocity difference flow meter |
| CN2618151Y (en) * | 2003-04-10 | 2004-05-26 | 五邑大学 | Intelligent supersonic level sensor |
| CN101886939A (en) * | 2010-06-10 | 2010-11-17 | 宁波大学 | Inhibition model and inhibition method for static drift of time difference ultrasonic flowmeter |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001116599A (en) * | 1999-10-20 | 2001-04-27 | Fuji Electric Co Ltd | Ultrasonic flowmeter |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2259619Y (en) * | 1995-10-13 | 1997-08-13 | 同济大学 | Ultrasonic velocity difference flow meter |
| CN2618151Y (en) * | 2003-04-10 | 2004-05-26 | 五邑大学 | Intelligent supersonic level sensor |
| CN101886939A (en) * | 2010-06-10 | 2010-11-17 | 宁波大学 | Inhibition model and inhibition method for static drift of time difference ultrasonic flowmeter |
Non-Patent Citations (1)
| Title |
|---|
| JP特开2001-116599A 2001.04.27 |
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