CN101464171A - Ultrasonic flux detection system and detection method - Google Patents
Ultrasonic flux detection system and detection method Download PDFInfo
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Abstract
The invention belongs to the detection field, and relates to an ultrasonic wave flow rate detecting system and a detecting method, in particular to a high-precision fluid flow rate ultrasonic wave detecting system and a detecting method. The ultrasonic wave flow rate detecting system includes a system control part, a circuit part and an auxiliary device. The ultrasonic wave flow rate detecting method is characterized in that an improved time difference method is adopted for calculating the speed of a fluid; the delay window reception technique is adopted, and the influence of noise on the detection precision during detection is reduced through pulse width detection; and as the resolution of measuring time for the system is further improved through the adoption of the interpolation correlation method and the correlation coefficient judgment method, and reaches 1.25ns, the accuracy and the precision of the ultrasonic flow-meter are remarkably improved. The detecting system provided by the invention has the characteristics of small size, low power consumption, stable and reliable measurement and the like; the precision reaches 0.5; the sensitivity attains 0.3mm/s; and the system is suitable for measuring the flow rates and the flow velocities of various liquids in plastic or metal pipes with diameters being 25mm-8m.
Description
Technical field
The invention belongs to detection range, relate to a kind of supersonic flow amount detection systems and detection method, particularly a kind of high-precision fluid flow ultrasonic wave detecting system and detection method.
Background technology
Fluids such as the water that flows through in all needing pipeline in industrial enterprises such as metallurgy, oil, chemical industry, electric power and urban water supply, draining, environmental administration, oil, sewage accurately measure.And kind flow quantity detecting system such as traditional detection method and turbine, vortex street, orifice plate, electromagnetism or pick-up unit all need its transducing part is installed in the pipeline, and join one section mounting pipe, not only be not easy to installation and maintenance, and can cause the problems such as the pressure loss, leakage of fluid, especially to poisonous, be corrosive, measurement explosive and band radiating medium fluid seems and is far from suitable.Therefore, greatly develop can be outside pipeline just can be accurately, the ultrasonic flow meter of flow is imperative in the measuring channel reliably.
The measuring ultrasonic wave flow technology be a kind of when utilizing ultrasonic signal in fluid, to propagate contained flow rate of fluid information measure the measuring technique of fluid flow, it has characteristics such as non-contact measurement, measuring accuracy height, measurement range be wide, convenient for installation and maintenance, is particularly suitable for the measurement of temporary pipeline flow, large diameter pipeline flow and dangerous fluid flow.In recent years, because the development of digital signal processor (DSP) and very large scale integration technology, and being that the ultrasonic flow meter of core extensively replaces the ultrasonic flow meter that domestic single-chip microcomputer is a core based on DSP, thereby utilize some technology of digital signal processing to improve the measuring accuracy of product.Along with the treatment technology of high-speed digital signal and developing rapidly of microprocessor technology, the research of the new detector material and technology, channel configuration and fluid dynamic research, the measuring ultrasonic wave flow technology has been made significant headway, and becomes a kind of important flow measurement technology.
According to principle to input, ultrasonic flow meter is broadly divided into types such as direct time difference method, time difference method, frequency-difference method, wave beam deflection method, Doppler method, spatial filtering method and noise method, the wherein most widely used ultrasonic flow meter that is based on time difference method at present.But time difference method generally is used for the fluid-velocity survey of large diameter pipeline, owing to contain velocity of sound C in the equation of flow velocity, it is subjected to Temperature Influence bigger, and promptly C is not a constant, thereby has influenced the accuracy of measuring.
When adopting time difference method, the general measure travel-time all is to receive ripple as the time switch signal with first that receive.In the time interval till from the emission ultrasonic pulse to first ripple that receives, because receiving gate is to open wide always, therefore, extraneous various undesired signals all are easy to invade, thereby influence measuring stability.And,, thereby reduce the reaction velocity of system because the intrusion of undesired signal can increase the related operation amount with in the process of the correlation measurement time difference.
In ultrasonic flow meter, be very high to the requirement of measuring accuracy.In the general fluid measurement, be 1m/s at velocity of medium, the time difference only was tens nanosecond, reach the resolution of nanosecond, and existing detection method is to be difficult to realize.
Summary of the invention
To exist in the prior art in order solving, to contain velocity of sound C in the calculating to flow velocity in testing process, it is subjected to Temperature Influence bigger, thereby has influenced the accuracy of measuring; Receiving gate is to open wide always in the testing process, extraneous various undesired signals all are easy to invade, thereby influence measuring stability and in ultrasonic flow detects, requirement to measuring accuracy is very high, velocity of medium is 1m/s, and the time difference only was tens nanosecond, reach the resolution of nanosecond, the technical matters that existing detection method can't realize the invention provides a kind of supersonic flow amount detection systems and detection method.
The present invention solves the technical matters that exists in the prior art, and the technical scheme that is adopted is, a kind of supersonic flow amount detection systems is provided, and described supersonic flow amount detection systems comprises systems control division, circuit part and servicing unit; Described systems control division further comprises: the single-chip microcomputer that is used to carry out system's control, data access and communication; Be used to carry out the digital signal processor of signal filtering processing and related operation; The field programmable gate array that is used for sequential control and level conversion; Described circuit part further comprises: commutation circuit, automatic gain control circuit, A/D conversion circuit, D/A conversion circuit; Described servicing unit further comprises: storage part, input media, display device, power supply and ultrasonic transducer; Native system comprises and is used for the function software of computing machine to the flowmeter controlled in wireless.Wherein, described field programmable gate array is connected with described ultrasonic transducer with described input media respectively, accepts the input instruction of described input media and described ultrasonic transducer is carried out sequential control; Described digital signal processor is connected with described storage part, carries out the exchange of data message; Described programmable gate array is connected with described digital signal processor is two-way with described single-chip microcomputer respectively; Described single-chip microcomputer is connected with described display device, carries out the demonstration of data message by described display device.
According to a preferred embodiment of the invention: described supersonic flow amount detection systems adopts multiple feed, comprises first power supply, second source and the 3rd power supply.Wherein, described first power supply is that described artificial circuit part power supply, described second source are that described digital circuit is partly powered, and described the 3rd power supply is that described power amplification circuit is partly powered.
According to a preferred embodiment of the invention: described first power supply and described the 3rd power supply adopt external 15v voltage to obtain 10v and 13v voltage through stabilivolt 1117; Described second source adopts DC-DC module, acquisition+5v voltage.
According to a preferred embodiment of the invention: described D/A conversion circuit comprises the first digital-to-analog converter section and the second digital-to-analog converter section; Wherein, the traffic figure conversion of signals that the described first digital-to-analog converter section adopts 16 digital-to-analog chip that detection is obtained is a voltage signal, as the input voltage signal of 4-20mA current output circuit; The described second digital-to-analog converter section is the gain-controlled voltage signal that is used for two-stage automatic gain controller amplifying circuit, adopt one 8 digital-to-analog chip that the amplitude digital signal of the ultrasonic signal that receives is converted to voltage signal, to adjust the gain multiple of automatic gain controller.
According to a preferred embodiment of the invention: described A/D conversion circuit is converted to 12 digital signal through frequency-selecting amplification and two-stage automatic gain control amplification back by ADS807 with the ultrasonic signal that receives.
According to a preferred embodiment of the invention: described automatic gain amplifying circuit has adopted the AD603 chip, is amplified to the amplitude of regulation after the ultrasonic signal process frequency-selecting of transducer reception is amplified again, to satisfy the requirement of subsequent conditioning circuit to signal Processing; Described automatic gain amplifying circuit is divided into two-stage to improve the working range of agc circuit.
According to a preferred embodiment of the invention: described system comprises the two-way circuit, and described circuit is by setting the higher limit of total flow and flow speed, reports to the police when surpassing described higher limit.
The present invention solves the technical matters that exists in the prior art, and the technical scheme that is adopted is, a kind of supersonic flow quantity measuring method is provided, and described supersonic flow quantity measuring method adopts time difference method, by
Obtain the speed of fluid; Adopt delay window reception technique, noise is to the influence of accuracy of detection in reducing to detect by the pulsewidth detection; Adopt interpolation correlation method and related coefficient determining method to make the resolution of systematic survey time reach 1.25ns.
According to a preferred embodiment of the invention: described delay window reception technique is specially the maximal value that detects sampled signal by described supersonic flow amount detection systems earlier, adjust the sample window position then, make the maximal value of sampled signal be positioned at the middle position of sample window, because the frequency of received signal is fixed, carry out the judgement of sampled signal validity by the numerical values recited that detects adjacent two crest location signaling points, if judge the invalid then resampling of sampled signal, if judging sampled signal is effectively, then sampled signal is foreshortened to suitable window width and carry out next step signal Processing again.
According to a preferred embodiment of the invention: described employing interpolation correlation method and related coefficient determining method make the resolution of systematic survey time reach the 1.25ns concrete operations for adopting linear interpolation method by described ultrasonic wave detecting system, sampled signal is first through carrying out linear interpolation again after the 55 rank FIR filtering, insert 19 points between the adjacent two data value, resolution is improved like this, makes temporal resolution reach 1.25ns.
The objective of the invention is precision and accuracy in order to improve ultrasonic flow meter.Given this Fa Ming purpose, native system improves from two aspects of hardware and software.At hardware aspect, it is the core that native system adopts DSP, FPGA and MCU, DSP mainly is responsible for the computing of signal filtering and related algorithm, and FPGA mainly realizes accurate sequential control, and MCU mainly realizes man-machine interface, system's control, data access and communication function.Like this from hardware aspect improve computing precision, shorten execution cycle, improve the reaction velocity of system.Aspect software, at first, system adopts improved time difference method, thereby has avoided system to be subjected to Temperature Influence, improves the measuring accuracy of system; Secondly, system has adopted delay window reception technique, has reduced interference of noise, has reduced the related operation amount, thereby shortens execution cycle; At last, adopt the interpolation correlation method, the resolution of systematic survey time is further improved, reach 1.25ns, thereby improved the precision and the accuracy of ultrasonic flow meter significantly.Among the present invention detection system have volume little, low in energy consumption, measure characteristics such as stable, reliable, precision reaches 0.5%, sensitivity reaches 0.3mm/s, is suitable for measuring the flow and the flow velocity of the interior various liquid of plastics that diameter is 25mm～8m and metallic conduit.
Description of drawings
Fig. 1. supersonic flow amount detection systems structural representation in a kind of supersonic flow amount detection systems of the present invention and the detection method;
Fig. 2. supersonic flow quantity measuring method process flow diagram.
Embodiment:
The invention will be further described below in conjunction with drawings and Examples:
Declarative procedure can be consulted supersonic flow amount detection systems structural representation and Fig. 2 supersonic flow quantity measuring method process flow diagram in a kind of supersonic flow amount detection systems of Fig. 1 the present invention and the detection method.
The principle of work of supersonic flow amount detection systems is, first ultrasonic transducer 104 and second ultrasonic transducer 104 under the control of programmable gate array 101, take turns to operate in emission and accepting state at the scene, and resonance frequency is 1MHz.Part undesired signal that 114 filterings have been amplified in the frequency-selecting of received signal process is sent to analog/digital converter 110 after being amplified by automatic gain control 112 again, with the slewing rate realization analog/digital conversion of each 25nS, and stores in the external RAM 115.The sequential control of whole process is all realized by field programmable gate array 101, has guaranteed the accuracy of sequential.In order further to improve the speed of operation, digital signal processor 103 at first with the data conversion storage in the external RAM in internal RAM, and according to the yield value of its size by digital/analog converter 107 control automatic gain control amplifiers 112, to realize automatic gain control, again it is carried out 55 rank FIR filtering.Through the filtered signal of FIR, its sampling rate is lower, and temporal resolution is 25nS, causes measuring accuracy not high enough.In order to improve precision, must carry out interpolation arithmetic.What native system was taked is linear interpolation, and temporal resolution is 1.25nS after the interpolation.Two groups of signals after the interpolation are handled through related operation again, just draw the mistiming of fluid following current and adverse current, thereby obtain flow rate of fluid.
Power unit has adopted many supply units in supersonic flow amount detection systems of the present invention as shown in Figure 1, i.e. simulation part adopts different power supply power supplies, the interference between the minimizing mutually with numerical portion.Mimic channel and power amplification circuit power supply adopt external 15v voltage to obtain 10v and 13v voltage through stabilivolt 1117, can reduce the interference of digital circuit like this; The digital circuit power supply adopts the DC-DC module, can improve the efficient of power supply, thereby acquisition+5v voltage to the digital circuit power supply, reduces the interference that mimic channel brings.
4-20mA current loop control part 109, the ultrasonic flow system is converted to the output of 4-20mA electric current with the flow parameter that records, adopt 16 digital-to-analog conversion chip MAX541 earlier digital signal to be converted to voltage signal, and then voltage signal is converted to current signal in the 4-20mA scope by AD694.
The two-way alerting signal partly is by setting the information that limit value comes the early warning flow, can set the higher limit of total flow and flow speed, just send alerting signal when surpassing higher limit.
Digital-to-analog conversion in this supersonic flow amount detection systems is divided into two parts, the first digital-to-analog converter section 108 is that the D/A chip MAX541 of 16 of employings is the traffic figure conversion of signals that records a voltage signal, as the input voltage signal of 4-20mA current output circuit.The second digital-to-analog converter section 107 is the gain-controlled voltage signals that are used for two-stage automatic gain controller AGC amplifying circuit 112, adopt one 8 D/A chip MAX550, the amplitude digital signal of the ultrasonic signal that receives is converted to voltage signal, to adjust the gain multiple of automatic gain controller.
Analog/digital conversion in this supersonic flow amount detection systems partly is that the ultrasonic signal that will receive is converted to 12 digital signal through frequency-selecting amplification 114 and two-stage automatic gain control amplification 112 backs by ADS807.
The principle that this supersonic flow amount detection systems is measured fluid flow is to adopt time difference method, calculates the flow of fluid by the propagation time difference that records the ultrasonic signal concurrent-countercurrent.Therefore, switch electronic switch, suitable to switch, contrary ultrasonic signal transmit direction by control signal.
To amplify 114 be to adopt bandwidth-limited circuit in frequency-selecting in this supersonic flow amount detection systems, and centre frequency is the frequency 1MHz of ultrasonic signal, has adopted the MAX436 chip, and purpose is in order to eliminate noise, and this part also has the effect of amplifying signal.
Automatic gain device AGC amplifies 112 parts and has adopted the AD603 chip in this supersonic flow amount detection systems, and effect is the amplitude that is amplified to regulation after the ultrasonic signal that transducer receives is amplified through frequency-selecting again, to satisfy the requirement of subsequent conditioning circuit to signal Processing.Amplifying circuit is divided into two-stage, to improve the working range of agc circuit.
The character type LCD screen 106 that 16X2 is adopted in the display part in this supersonic flow amount detection systems is finished the real-time demonstration to the every data of system, parameter, comprising the demonstration of information such as instantaneous delivery, integrated flow as display device.
The matrix keyboard 105 of 16 buttons of 4X4 is adopted in the importation in this supersonic flow amount detection systems, utilizes 4X4 matrix-scanning mode to judge the input state of keyboard, adopts verilog HDL language that fpga chip is programmed and judges the state of button.
The software of native system comprises system's control and digital signal processing two parts.The function of control section comprises the design of man-machine interface, data access and communication function etc.; The digital signal processing part mainly is to carry out the computing of sampled signal by the parameter setting of man-machine interface, thereby draws The ultimate results.
Supersonic flow quantity measuring method process flow diagram can be consulted Fig. 2, as shown in Figure 2.When beginning, program run sets relevant parameter earlier, as pipe diameter, material etc., after parameter sets operation, single-chip microcomputer 102 at first is loaded into DSP with parameter, control transmitting of field programmable gate array 101 output ultrasonic waves by DSP again, judge the intensity of signal, thereby control the enlargement factor of acquired signal by automatic gain controller 112 according to the data of gathering back, again launch ultrasonic signal after adjusting enlargement factor, till signal intensity meets the demands.Judge quality of signals according to the integrality and the undesired signal of signal after the data process FIR filtering of gathering back, when off quality, turn back to the program of transmitting again.Detection is by after commutation circuit changes hyperacoustic transmit direction, thereby records the ultrasonic signal of other direction.Two groups along backward signal datas record after through interpolation arithmetic, improve the resolution of signal, carry out the related operation of two groups of data then, obtain required flow velocity and flow value by the mistiming that calculates, data pass to single-chip microcomputer 102 and show by LCD LCDs 106.Continue the measurement of next group data after one-period is finished, dynamically demonstrate the state of fluid.
For reach the supersonic flow amount detection systems the high Precision Detection performance, the present invention improves the accuracy of detection that improves system from three aspects.
One, adopts improved time difference method
The physical quantity that time difference method is measured is the time that ultrasound wave is propagated in fluid, comes the flow velocity of Fluid Computation by the propagation time difference of measuring following current and adverse current.What native system adopted is that V-type is installed, and the speed of fluid is v, and the speed of ultrasound wave in stationary fluid is c, and caliber is D, and emission angle is θ.When the ultrasound wave following current was propagated, its speed was c+vsin θ.Thereby the travel-time during following current:
Td is that sound wave is in the travel-time of tube wall and probe and the summation of circuit delay time in the formula.Travel-time in the time of can obtaining adverse current equally:
Can obtain two kinds of propagation time differences under the situation like this:
Formula (3) is simplified computing, thereby can get:
Formula (4) is owing to contain velocity of sound c in the equation of flow velocity, and it is subjected to Temperature Influence bigger, and promptly c is not a constant, thereby has influenced the accuracy of measuring, and must carry out temperature compensation when therefore adopting this general time difference method.
And supersonic flow quantity measuring method of the present invention improves prior art, makes the detection to flow velocity not be subjected to Temperature Influence, and its principle is as follows:
The velocity of propagation of ultrasound wave in fluid is during following current:
The velocity of propagation of ultrasound wave in fluid is during adverse current:
Two formulas are subtracted each other, and consider Δ t=t
S-t
n, can obtain:
Do not contain velocity of sound c in the following formula, as long as measure adverse current travel-time t
nT gets final product with Δ.Supersonic flow quantity measuring method of the present invention adopts the improvement time difference method to avoid system to be subjected to Temperature Influence, thereby improves the measuring accuracy of system.
Two, adopt delay window reception technique
Delay aperture is that the signal outside the window will not receive, and can reduce interference of noise like this at the effective time window of front and back ability that received signal arrives.For guaranteeing the validity of detection signal, must to remove the interference of receiving end earlier, adopt window and pulsewidth detection method in the supersonic flow quantity measuring method of the present invention.The position of measurement window is to be provided with according to the parameter that man-machine conversation is imported, and the setting of window defines the range of receiving of signal, has eliminated interference of noise to a certain extent; The pulsewidth detection technique is known according to the received signal frequency, and its width is much wideer that characteristics are told received signal than disturbing pulse, to eliminate the erroneous judgement that common amplitude discriminating method may cause.
The method to set up of delay aperture is such: single-chip microcomputer calculates the reference position of window according to the parameter (caliber, wall thickness and fluid media (medium)) of man-machine conversation input, because the resonance frequency of transducer probe is 1MHz, sample frequency is 40MHz, it is 5 cycles that probe transmits, in order better to adopt received signal, the sampling width is set at 800 signaling points for the first time, i.e. 20 signal periods.In order to detect the received signal in the window, used the pulsewidth detection technique.Normal received signal is the known pulse of a string frequency, adopts common amplitude discrimination technique may produce erroneous judgement, because disturbing pulse also may have quite high amplitude, but it does not have suitable width.Therefore, native system detects earlier the maximal value of sampled signal, adjusts the sample window position then, makes the maximal value of sampled signal be positioned at the middle position of sample window.Because the frequency of received signal is fixed, i.e. 1MHz, therefore, the size of value that can be by detecting adjacent two crest location signaling points is judged the validity of sampled signal.If judge the invalid then resampling of sampled signal, till adopting useful signal.If judge sampled signal for effective, then sampled signal being foreshortened to suitable window width carries out next step signal Processing again, thereby reduces operand, quickening arithmetic speed.
Three, adopt interpolation correlation method and related coefficient determining method
Supersonic flow quantity measuring method of the present invention:
σ
x, σ
yBe respectively the mean square deviation of two groups of sampled signals:
R is called related coefficient, and its formula is:
Following formula is through obtaining formula after simplifying:
The key character of correlation coefficient r is: 0＜| r|＜1, r is that r is that negative value is a negative correlation on the occasion of being positive correlation.Two groups of signals of native system sampling belong to positive correlation, thus the r value be on the occasion of.
The method of native system time difference measurement is to determine by the facies relationship numerical value of judging two groups of sampled signals.The signal that systematic sampling returns is after filtering and interpolation processing, and the phase relation by two groups of sampled signals of continuous change calculates related coefficient simultaneously, and is last, calculates when related coefficient is maximum phase differential between two groups of sampled signals, thereby draws time difference.
In two groups of known sampled signals, the value of the denominator term in the formula of correlation coefficient is constant, is not change in the phase shift process with two groups of sampled signals.Therefore, when judging the related coefficient maximal value, only need to calculate the molecular formula item n ∑ x in the formula of correlation coefficient
iy
i-(∑ x
i) (∑ y
i) value, judge that then its maximal value gets final product.Can reduce the operand of system so widely, improve the speed of the reaction of system.
The objective of the invention is precision and accuracy in order to improve ultrasonic flow meter.Given this Fa Ming purpose, native system improves from two aspects of hardware and software.At hardware aspect, it is the core that native system adopts digital signal processor, field programmable gate array and single-chip microcomputer, digital signal processor mainly is responsible for the computing of signal filtering and related algorithm, field programmable gate array is mainly realized accurate sequential control, and single-chip microcomputer is mainly realized man-machine interface, system's control, data access and communication function.Like this from hardware aspect improve computing precision, shorten execution cycle, improve the reaction velocity of system.Aspect software, at first, system adopts improved time difference method, thereby has avoided system to be subjected to Temperature Influence, improves the measuring accuracy of system; Secondly, system has adopted delay window reception technique, has reduced interference of noise, has reduced filtering and related operation amount, thereby shortens execution cycle; At last, adopt the interpolation correlation method, the resolution of systematic survey time is further improved, reached 1.25ns, thereby improved the precision and the accuracy of ultrasonic flow meter significantly.Detection system has characteristics such as volume is little, low in energy consumption, measurement is stable, reliable among the present invention, precision reaches 0.5%, sensitivity reaches 0.3mm/s, is suitable for measuring the plastics that diameter is 25mm～8m and flow, flow velocity and the flow direction of the various liquid in the metallic conduit.
Among the above embodiment as an example the explanation edit instruction that adopted system to provide finish editing operation and set type again after the result.Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (10)
1. supersonic flow amount detection systems, it is characterized in that: described supersonic flow amount detection systems comprises systems control division, circuit part and servicing unit;
Described systems control division further comprises:
Be used to carry out the single-chip microcomputer (102) of system's control, data access and communication;
Be used to carry out the digital signal processor (103) of signal filtering processing and related operation;
The field programmable gate array (101) that is used for sequential control and level conversion;
Described circuit part further comprises: commutation circuit (111), automatic gain control circuit (112), A/D conversion circuit (110), D/A conversion circuit (107,108);
Described servicing unit further comprises: storage part, input media (105), display device (106), power supply and ultrasonic transducer (104);
Wherein, described field programmable gate array (101) is connected with described ultrasonic transducer (104) with described input media (105) respectively, accepts the input instruction of described input media (105) and described ultrasonic transducer (104) is carried out sequential control;
Described digital signal processor (103) is connected with described storage part, carries out the exchange of data message;
Described field programmable gate array (101) respectively with described single-chip microcomputer (102) and two-way connection of described digital signal processor (103);
Described single-chip microcomputer (102) is connected with described display device (106), carries out the demonstration of data message by described display device (106).
2. according to the described supersonic flow amount detection systems of claim 1, it is characterized in that: described supersonic flow amount detection systems adopts multiple feed, comprises first power supply, second source and the 3rd power supply.
Wherein, described first power supply is that described artificial circuit part power supply, described second source are that described digital circuit is partly powered, and described the 3rd power supply is the power supply of described power amplification circuit (113) part.
3. according to the described supersonic flow amount detection systems of claim 2, it is characterized in that: described first power supply and described the 3rd power supply adopt external 15v voltage to obtain 10v and 13v voltage through stabilivolt 1117; Described second source adopts DC-DC module, acquisition+5v voltage.
4. according to the described supersonic flow amount detection systems of claim 1, it is characterized in that: described D/A conversion circuit comprises the first digital-to-analog converter section (108) and the second digital-to-analog converter section (107);
Wherein, the traffic figure conversion of signals that the described first digital-to-analog converter section (108) adopts 16 digital-to-analog chip that detection is obtained is a voltage signal, as the input voltage signal of 4-20mA (109) current output circuit;
The described second digital-to-analog converter section (107) is the gain-controlled voltage signal that is used for two-stage automatic gain controller amplifying circuit (112), adopt one 8 digital-to-analog chip that the amplitude digital signal of the ultrasonic signal that receives is converted to voltage signal, to adjust the gain multiple of automatic gain controller.
5. according to the described supersonic flow amount detection systems of claim 1, it is characterized in that: the ultrasonic signal that receives is amplified (114) through frequency-selecting to described A/D conversion circuit (110) and two-stage automatic gain control amplification (112) back is converted to 12 digital signal by ADS807.
6. according to the described supersonic flow amount detection systems of claim 1, it is characterized in that: described automatic gain amplifying circuit (112) has adopted the AD603 chip, be amplified to the amplitude of regulation after the ultrasonic signal process frequency-selecting amplification with ultrasonic transducer (104) reception again, to satisfy the requirement of subsequent conditioning circuit to signal Processing;
Described automatic gain amplifying circuit (112) is divided into two-stage, to improve the working range of agc circuit.
7. according to the described supersonic flow amount detection systems of claim 1, it is characterized in that: described system comprises the two-way circuit, and described circuit is by setting the higher limit of net flow and flow speed, reports to the police when surpassing described higher limit.
8. supersonic flow quantity measuring method is characterized in that: described supersonic flow quantity measuring method adopts time difference method, by
Obtain the speed of fluid; Adopt delay window reception technique, noise is to the influence of accuracy of detection in reducing to detect by the pulsewidth detection; Adopt interpolation correlation method and related coefficient determining method to make the resolution of systematic survey time reach 1.25ns.
9. described according to Claim 8 supersonic flow quantity measuring method, it is characterized in that: described delay window reception technique is specially the maximal value that detects sampled signal by described supersonic flow amount detection systems earlier, adjust the sample window position then, make the maximal value of sampled signal be positioned at the middle position of sample window, because the frequency of received signal is fixed, carry out the judgement of sampled signal validity by the numerical values recited that detects adjacent two crest location signaling points, if judge the invalid then resampling of sampled signal, if judging sampled signal is effectively, then sampled signal is foreshortened to suitable window width and carry out next step signal Processing again.
10. described according to Claim 8 supersonic flow quantity measuring method, it is characterized in that: described employing interpolation correlation method and related coefficient determining method make the resolution of systematic survey time reach the 1.25ns concrete operations for adopting linear interpolation method by described ultrasonic wave detecting system, sampled signal is first through carrying out linear interpolation again after the 55 rank FIR filtering, insert 19 points between the adjacent two data value, resolution has just obtained further raising like this, makes temporal resolution reach 1.25ns.
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| CN102261937A (en) * | 2011-04-25 | 2011-11-30 | 西安交通大学 | High-accuracy time-difference type ultrasonic flow meter and method for measuring flow thereof |
| CN102323585A (en) * | 2011-08-30 | 2012-01-18 | 广州优创电子有限公司 | Treatment method for ultrasonic wave |
| CN102494725A (en) * | 2011-12-16 | 2012-06-13 | 唐山汇中仪表股份有限公司 | Combination method of intelligent ultrasonic flowmeter |
| CN102549394A (en) * | 2009-09-30 | 2012-07-04 | 松下电器产业株式会社 | Flow rate measuring device |
| CN103093749A (en) * | 2011-10-27 | 2013-05-08 | 财团法人工业技术研究院 | Ultrasonic receiving module, method and system |
| CN103323063A (en) * | 2013-05-17 | 2013-09-25 | 深圳职业技术学院 | Ultrasonic flow meter and time difference measuring method thereof |
| CN103389133A (en) * | 2013-07-26 | 2013-11-13 | 浙江理工大学 | High-response speed ultrasonic flowmeter |
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|---|---|---|---|---|
| CN201145594Y (en) * | 2007-12-18 | 2008-11-05 | 深圳职业技术学院 | Device for detecting ultrasonic wave flow |
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