CN103383276A - Ultrasonic flow rate detection system - Google Patents
Ultrasonic flow rate detection system Download PDFInfo
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- CN103383276A CN103383276A CN 201210134441 CN201210134441A CN103383276A CN 103383276 A CN103383276 A CN 103383276A CN 201210134441 CN201210134441 CN 201210134441 CN 201210134441 A CN201210134441 A CN 201210134441A CN 103383276 A CN103383276 A CN 103383276A
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Abstract
An ultrasonic flow rate detection system comprises a system control part, a circuit part and an assistant device, wherein the system control part comprises a single chip, a digital signal processor, and an on-site programmable gate array; the circuit part comprises a switching circuit, an automatic gaining control amplifying circuit, an analog/digital converting circuit, and a digital/analog converting circuit; the assistant device comprises a storage part, an input device, a display device a power supply and an ultrasonic transducer; the on-site programmable gate array is connected with the input device and the ultrasonic transducer respectively, and used for receiving the input instruction of the input device and conducting time control on the ultrasonic transducer; the digital signal processor is connected with the storage part, and used for data information exchange; the on-site programmable gate array is in bi-directional connection with the single chip and the digital signal processor respectively; the single chip is connected with the display device, and used for displaying data information through the display device.
Description
Technical field
The present invention relates to the discharge detection system in the fields such as water conservancy, agricultural, particularly relate to a kind of Ultrasonic Flow-detecting System.
Background technology
The ultrasonic measurement fluid flow is widely used in Industrial Engineering, in oil, chemical engineering industry production procedure, uses Ultrasonic Detection to understand the total flow of petroleum collection; On large-scale power station or dam station, the variation that ultrasonic flowmeter detects water flow in real time will be installed; And present huge numbers of families have the water pipe water meter of oneself, how can detect quite reasonable and accurately each user's water situation, not allowing the water factory that produces tap water and the measurement problem that the user worries discharge, is also when the next very actual soluble problem of ultrasonic flow measurement; The above measurement that every household water pipe flow detected that flows to industrial petroleum pipe line from large river water all is summed up as the problem of ultrasonic measurement fluid flow, can see further investigation ultrasonic measurement fluid flow, making the precision of ultrasonic measurement fluid flow reach the level of more increasing is to have very real meaning.Time difference method is one of the method for main use of ultrasonic flow measurement in this year.Time difference method is applicable to most detected fluid and is widely used because it is accurately higher.Instantly, the main common method of time difference measurement has: cross-correlation method, broad sense cross-correlation method, Higher Order Cumulants, phase method etc.Time difference method generally is used for the fluid-velocity survey of large diameter pipeline, contains the velocity of sound in the equation due to flow velocity, and it is subjected to the impact of temperature larger, and the velocity of sound is not a constant, thereby has affected the accuracy of measuring.When adopting time difference method, the general measure travel-time is all that first that receive receives ripple as the time switch signal.In the time interval from the emission ultrasonic pulse till first ripple that receives, because receiving gate is to open wide always, therefore, extraneous various undesired signals are easy to invasion, thus the stability that impact is measured.And with in the process of the correlation measurement time difference, because the invasion of undesired signal can increase the related operation amount, thereby reduce the reaction velocity of system.In ultrasonic flow meter, be very high to the requirement of measuring accuracy.In general fluid measurement, be 1m/s at velocity of medium, time difference method was only tens nanosecond, reach the resolution of nanosecond, and existing detection method is to be difficult to realize.
Summary of the invention
Contain the velocity of sound in order to solve in the testing process that exists in prior art in calculating to flow velocity, it is subjected to the impact of temperature larger, thereby has affected the accuracy of measuring; In testing process, receiving gate is to open wide always, extraneous various undesired signals all are easy to invade, thereby the stability that impact is measured and very high to the requirement of measuring accuracy in excusing from death wave current amount detects, velocity of medium is 1m/s, the time difference was only tens nanosecond, reach the resolution of nanosecond, the technical matters that existing detection method can't realize the invention provides a kind of described Ultrasonic Flow-detecting System.
The present invention is achieved in that a kind of Ultrasonic Flow-detecting System, comprises systems control division, circuit part and servicing unit; Described systems control division further comprises: for the single-chip microcomputer that carries out system's control, data access and communication; Be used for carrying 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, amplifying electric circuit with auto-gain-controlling function, A/D conversion circuit, D/A conversion circuit; Described servicing unit further comprises: storage part, input media, display device, power supply and ultrasonic transducer; Wherein, described field programmable gate array respectively with described input media be connected ultrasonic transducer and be connected, accept the input instruction of described input media and also described ultrasonic transducer carried out sequential control; Described digital signal processor is connected with described storage part, carries out the exchange of data message; Described field programmable gate array respectively with described single-chip microcomputer be connected that digital signal processor is two-way to be connected; Described single-chip microcomputer is connected with described display device, carries out the demonstration of data message by described display device.
The present invention compared with prior art has following beneficial effect: the present invention adopts delay window reception technique, the impact of noise on accuracy of detection in reducing to detect by pulse width detection; Employing difference correlation method and related coefficient determining method are that the resolution of systematic survey time reaches 1.25ns.The objective of the invention is precision and accuracy in order to improve ultrasonic flow meter.Given this purpose of invention, native system improves from hardware and software two aspects.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 realizes that mainly man-machine interface, system control, the data access machine 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 the improved time difference method of system, thereby has avoided system to be subjected to the impact of temperature, improves the measuring accuracy of system; Secondly, system adopts improved time difference method, thereby has avoided system to be subjected to the impact of temperature, improves the measuring accuracy of system; Secondly, system has adopted delay window reception technique, has reduced the interference of noise, has reduced the related operation amount, thereby shortens execution cycle; At last, adopt the difference correlation method, the resolution of systematic survey time is further enhanced, reach 1.25ns, thereby improved significantly precision and the accuracy of ultrasonic flow meter.In the present invention detection system have that volume is little, power is low, Measurement sensibility, the characteristics such as reliable, precision reaches 0.5%, sensitivity reaches 0.3mm/s, is suitable for measuring plastics that diameter is 25mm-8m and flow and the flow velocity of the various liquid in metallic conduit.
Description of drawings
Fig. 1, a kind of Ultrasonic Flow-detecting System structural representation of the present invention.
Embodiment
The invention will be further described below in conjunction with the drawings and specific embodiments.
A kind of Ultrasonic Flow-detecting System comprises systems control division, circuit part and servicing unit; Described systems control division further comprises: for the single-chip microcomputer 102 that carries out system's control, data access and communication; Be used for carrying 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, amplifying electric circuit with auto-gain-controlling function 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 respectively with described input media 105 be connected ultrasonic transducer 104 and be connected, accept the input instruction of described input media 105 and described ultrasonic transducer 104 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 be connected that digital signal processor 103 is two-way to be connected; Described single-chip microcomputer 102 is connected with described display device 106, carries out the demonstration of data message by described display device 106.
Above-described embodiment is only for explanation the present invention, and is not to be limitation of the present invention, the those of ordinary skill in relevant technologies field, without departing from the invention, can also make a variety of changes and modification, therefore, all technical schemes that are equal to also should belong to category of the present invention.
Claims (1)
1. a Ultrasonic Flow-detecting System, is characterized in that: comprise systems control division, circuit part and servicing unit; Described systems control division further comprises: for the single-chip microcomputer (102) that carries out system's control, data access and communication; Be used for carrying 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), amplifying electric circuit with auto-gain-controlling function (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) respectively with described input media (105) be connected ultrasonic transducer (104) and be connected, accept the input instruction of described input media (105) and described ultrasonic transducer (104) 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) be connected two-way connection of 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).
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CN 201210134441 CN103383276A (en) | 2012-05-04 | 2012-05-04 | Ultrasonic flow rate detection system |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104601131A (en) * | 2014-12-23 | 2015-05-06 | 重庆川仪自动化股份有限公司 | Receipt signal strength automatic gain control method for gas ultrasonic flow meter transducer |
CN104697593A (en) * | 2015-03-24 | 2015-06-10 | 合肥工业大学 | Ultrasonic gas flowmeter on basis of FPGA (field programmable gate array) and DSP (digital signal processor) |
CN106248157A (en) * | 2016-06-27 | 2016-12-21 | 浙江大学 | The determination method of cross-correlation time difference method Ultrasonic Wave Flowmeter reference waveform |
-
2012
- 2012-05-04 CN CN 201210134441 patent/CN103383276A/en active Pending
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104601131A (en) * | 2014-12-23 | 2015-05-06 | 重庆川仪自动化股份有限公司 | Receipt signal strength automatic gain control method for gas ultrasonic flow meter transducer |
CN104601131B (en) * | 2014-12-23 | 2017-02-22 | 重庆川仪自动化股份有限公司 | Receipt signal strength automatic gain control method for gas ultrasonic flow meter transducer |
CN104697593A (en) * | 2015-03-24 | 2015-06-10 | 合肥工业大学 | Ultrasonic gas flowmeter on basis of FPGA (field programmable gate array) and DSP (digital signal processor) |
WO2016150385A1 (en) * | 2015-03-24 | 2016-09-29 | 合肥工业大学 | Fpga- and dsp-based gas ultrasonic flowmeter and metering method therefor |
CN106248157A (en) * | 2016-06-27 | 2016-12-21 | 浙江大学 | The determination method of cross-correlation time difference method Ultrasonic Wave Flowmeter reference waveform |
CN106248157B (en) * | 2016-06-27 | 2018-12-07 | 浙江大学 | The determination method of cross-correlation time difference method Ultrasonic Wave Flowmeter reference waveform |
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Application publication date: 20131106 |