CN104634424A - Method of detecting state of ultrasonic flowmeter - Google Patents
Method of detecting state of ultrasonic flowmeter Download PDFInfo
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- CN104634424A CN104634424A CN201510095117.7A CN201510095117A CN104634424A CN 104634424 A CN104634424 A CN 104634424A CN 201510095117 A CN201510095117 A CN 201510095117A CN 104634424 A CN104634424 A CN 104634424A
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Abstract
The invention belongs to the field of ultrasonic flow detection and particularly relates to a method of detecting the state of an ultrasonic flowmeter. According to the method, aftershock generated by a piezoceramic plate of an ultrasonic transducer after an exciting signal stops acting imparts after-wave to the exciting signal, transducer faults can be judged or troubleshot quickly just by subjecting the flowmeter to circuit detection in the tube emptiness or fault state, the tube emptiness state or fault causes are further ensured, and the maintenance process of the ultrasonic flowmeter is greatly simplified.
Description
Technical field
The invention belongs to ultrasonic flow detection field, be specifically related to a kind of condition detection method for ultrasonic flowmeter.
Background technology
The ultrasonic flowmeter of time difference method principle manufacture is adopted to be one of popular at present ultrasonic flowmeter method for designing.Its design concept is: the fluid measurement pipeline being provided with the transceiving integrated transducer of Bi-directional Ultrasonic ripple, at co-current flow and counter-current flow direction alternate emission ultrasonic signal and receive ultrasound wave produce echoed signal, and calculate ultrasound wave in fluid is propagated with this, once replace the produced propagation time difference.Fluids within pipes flow is gone out by dependent conversion calculated with mathematical model.But when circuit, transducer damage, fluids within pipes contain more air even cut off the water reasons such as causing pipeline blank pipe occur time, the reception of echoed signal will go wrong, echoed signal can not be received within a certain period of time or do not receive echoed signal at all, causing ultrasonic flowmeter normally to work.Therefore, accurately know that the duty of ultrasonic flowmeter is vital for the maintenance of ultrasonic flowmeter and maintenance, and the condition detection method being applied to ultrasonic flowmeter do not had at present.
Noticeable phenomenon is, ultrasonic transducer generally adopts piezoelectric ceramics to be made, mechanical vibration can be produced under pumping signal effect, after pumping signal stops excitation, transducer also can produce aftershock within a period of time, and aftershock decays gradually until disappear, and the aftershock of transducer can produce corresponding repercussions in circuit, make field wave signal with repercussions, the repercussions duration is corresponding with aftershock.Therefore, when the reception of echoed signal goes wrong, whether us just can be helped accurately to judge or get rid of transducer fault with repercussions by detecting field wave, thus further clear and definite empty pipe condition or failure cause.
Summary of the invention
Therefore, the object of the present invention is to provide the condition detection method in a kind of Ultrasonic Flow-detecting System, normal work, blank pipe or malfunction can be judged quickly and accurately and further clear failure reason.
For a condition detection method for ultrasonic flowmeter, comprise the steps: 1) under ultrasonic flowmeter duty, if receive echoed signal in the given time, illustrate that ultrasonic flowmeter is in normal operating conditions; If do not receive echoed signal in the given time, illustrate that ultrasonic flowmeter is in blank pipe or malfunction; 2) under blank pipe or malfunction, offer detection window in the microcontroller, make pumping signal output circuit be connected to the first/the second transducer and launch to have the field wave signal of some cycles number, after battery has fired, whether start detection windows detecting field wave signal is with repercussions a period of time; 3) if field wave signal is with repercussions, institute's detection transducer and pumping signal output circuit non-fault are described, with being connected to another transducer by exiting signal generating circuit and launching the field wave signal with some cycles number, whether again detect field wave signal with repercussions, if field wave signal is with repercussions, another transducer also non-fault is described, then ultrasonic flowmeter is in empty pipe condition; If field wave repercussions do not detected arbitrary time in twice testing process, then illustrate that exiting signal generating circuit or this transducer break down, launch field wave signal so again, whether start detection windows detecting field wave exists simultaneously, if field wave exists, illustrate that this ultrasonic transducer damages, if field wave does not exist, illustrate that pumping signal output circuit damages.
Preferably, the described schedule time is determined according to the industrial design of ultrasonic flowmeter and working environment.
Preferably, described a period of time should be greater than microcontroller switch window required time, is less than transducer aftershock and produces corresponding field wave repercussions maximum time.
Preferably, described a period of time is 1 ~ 3 μ s.
Beneficial effect of the present invention is: utilize the piezoelectric ceramic piece in ultrasonic transducer can produce aftershock and then make field wave signal with the phenomenon of repercussions after pumping signal fails, under blank pipe or malfunction, the fault that electric circuit inspection just can judge rapidly or get rid of transducer is carried out to flowmeter, thus further clear and definite empty pipe condition or failure cause, greatly simplify the inspection and maintenance process of ultrasonic flowmeter.
Accompanying drawing explanation
Fig. 1 is Ultrasonic Flow-detecting System schematic diagram of the prior art;
Fig. 2 is echoed signal clocking method schematic diagram;
Fig. 3 is that detection window detects field wave signal schematic representation under different conditions, and (a) pumping signal output circuit and transducer normally work; B () transducer damages; C () pumping signal output circuit damages.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further elaborated.
See Fig. 1, in the detection system of ultrasonic flowmeter, be at least provided with microcontroller, timing circuit, pumping signal output circuit, signalling channel control circuit, the first transducer and the second transducer.Wherein, microcontroller is used for the work of each circuit module in Systematical control ultrasonic flowmeter, and the chronometric data of acquisition is calculated Fluid Volume in conjunction with other combined factors such as temperature, stream tube sections; Pumping signal output circuit is used for the pumping signal of output drive transmitting transducer; Signalling channel control circuit is used for pumping signal optionally to access the first transducer/the second transducer, realizes the object measuring following current/adverse current flow velocity; And existing timing circuit adopts the timing circuit with fixed crystal oscillation frequency to realize usually.
See Fig. 2, the measuring principle of Ultrasonic Flow-detecting System is: microprocessor controls pumping signal output circuit is connected to the first/the second transducer and output drive signal encourages this transducer to send ultrasonic signal, produced echoed signal by another receive MUT after elapsed time t1, complete a time measurement; Again pumping signal output circuit is connected to the second/the first transducer and output drive ripple signal encourages this transducer to send ultrasonic signal, after elapsed time t2, is produced echoed signal by another receive MUT, complete second time time measurement.Described t1, t2 are exactly echoed signal timing time and t=nT, and wherein T is the fixed crystal oscillation period of timing circuit.Because the speed of ultrasound wave in co-current flow and counter-current flow is different, by comparing the difference of time t1, t2, just can converses the speed of fluid, then flow through the size in cross section according to fluid, just can learn flow.
Condition detection method in the present invention is: under ultrasonic flowmeter duty, if receive echoed signal in the given time, illustrates that ultrasonic flowmeter is in normal operating conditions; If do not receive echoed signal in the given time, illustrate that ultrasonic flowmeter is in blank pipe or malfunction.Under blank pipe or malfunction, control program enters fault detect pattern: offer detection window in the microcontroller (MCU) in ultrasonic flowmeter, make pumping signal output circuit be connected to the first/the second transducer and launch the field wave signal with some cycles number, after battery has fired, whether start detection windows detecting field wave signal is with repercussions a period of time, result has two kinds: 1) if field wave signal is with repercussions, as shown in Fig. 3 (a), institute's detection transducer and pumping signal output circuit non-fault are described, with being connected to another transducer by exiting signal generating circuit and launching the field wave signal with some cycles number, whether again detect field wave signal with repercussions, if field wave signal is with repercussions, as shown in Fig. 3 (a), another transducer also non-fault is described, then ultrasonic flowmeter is in empty pipe condition, 2) if field wave repercussions do not detected arbitrary time in twice testing process, then illustrate that exiting signal generating circuit or this transducer break down, launch field wave signal so again, whether start detection windows detecting field wave exists simultaneously, if field wave exists, as shown in Figure 3 (b), illustrate that this ultrasonic transducer damages, if field wave does not exist, as shown in Figure 3 (c), illustrate that pumping signal output circuit damages.
In above-mentioned condition detection method, the determination of the schedule time needs the industrial design according to ultrasonic flowmeter, the arranging etc. of the bore of such as ultrasonic flowmeter and catoptron affect ultrasonic wave propagation path because usually determining.On the other hand, the working environment of ultrasonic flowmeter, such as fluid media (medium) kind, concurrent-countercurrent state, the rate of flow of fluid even environmental factor such as temperature, pressure also affect the determination of the schedule time.
In above-mentioned condition detection method, described a period of time is preferably 1 μ s ~ 3 μ s, and 1 μ s is used for detection window to switch to corresponding port, and after 3 μ s, transducer aftershock may very faintly even disappear.Certainly, the scope of described a period of time is relevant to the parameter of circuit and transducer, is not determined value.
The present invention utilizes the piezoelectric ceramic piece in ultrasonic transducer can produce aftershock and then make field wave signal with the phenomenon of repercussions after pumping signal fails, under blank pipe or malfunction, the fault that electric circuit inspection just can judge rapidly or get rid of transducer is carried out to flowmeter, thus further clear and definite empty pipe condition or failure cause, greatly simplify the inspection and maintenance process of ultrasonic flowmeter.
It should be noted that, there are in Ultrasonic Flow-detecting System in the embodiment that the present invention provides two transmitting-receiving integrated ultrasonic transducers, and the present invention is not limited thereto, the Ultrasonic Flow-detecting System of any use ultrasonic transducer can utilize field wave in the present invention come clear and definite with the characteristic of repercussions or get rid of the fault of transducer, and no matter the number of transducer is how many.
Claims (5)
1., for a condition detection method for ultrasonic flowmeter, comprise the steps: 1) under ultrasonic flowmeter duty, if receive echoed signal in the given time, illustrate that ultrasonic flowmeter is in normal operating conditions; If do not receive echoed signal in the given time, illustrate that ultrasonic flowmeter is in blank pipe or malfunction; 2) under blank pipe or malfunction, offer detection window in the microcontroller, make pumping signal output circuit be connected to the first/the second transducer and launch to have the field wave signal of some cycles number, after battery has fired, whether start detection windows detecting field wave signal is with repercussions a period of time; 3) if field wave signal is with repercussions, institute's detection transducer and pumping signal output circuit non-fault are described, with being connected to another transducer by exiting signal generating circuit and launching the field wave signal with some cycles number, whether again detect field wave signal with repercussions, if field wave signal is with repercussions, another transducer also non-fault is described, then ultrasonic flowmeter is in empty pipe condition; If field wave repercussions do not detected arbitrary time in twice testing process, then illustrate that exiting signal generating circuit or this transducer break down, launch field wave signal so again, whether start detection windows detecting field wave exists simultaneously, if field wave exists, illustrate that this ultrasonic transducer damages, if field wave does not exist, illustrate that pumping signal output circuit damages.
2. a kind of condition detection method for ultrasonic flowmeter according to claim 1, is characterized in that: the described schedule time is determined according to the industrial design of ultrasonic flowmeter and working environment.
3. a kind of condition detection method for ultrasonic flowmeter according to claim 1, is characterized in that: described some cycles number is 8.
4. a kind of condition detection method for ultrasonic flowmeter according to claim 1, is characterized in that: described a period of time should be greater than microcontroller switch window required time, is less than transducer aftershock and produces corresponding field wave repercussions maximum time.
5. a kind of condition detection method for ultrasonic flowmeter according to claim 4, is characterized in that: described a period of time is 1 ~ 3 μ s.
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| CN201510095117.7A CN104634424B (en) | 2015-03-04 | 2015-03-04 | For the condition detection method of ultrasonic flowmeter |
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| CN201510095117.7A CN104634424B (en) | 2015-03-04 | 2015-03-04 | For the condition detection method of ultrasonic flowmeter |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105043509A (en) * | 2015-05-22 | 2015-11-11 | 重庆川仪自动化股份有限公司 | Detecting method for liquid ultrasonic flowmeter and detecting system thereof |
| CN106500783A (en) * | 2016-12-08 | 2017-03-15 | 深圳市锐能微科技股份有限公司 | A kind of hydro-thermal table and its current amount detecting device |
| CN106908777A (en) * | 2015-12-15 | 2017-06-30 | 现代奥特劳恩株式会社 | Ultrasonic signal optimizes device and method |
| CN107290013A (en) * | 2017-08-07 | 2017-10-24 | 潍坊奥博仪表科技发展有限公司 | A kind of two-channel ultrasonic flowmeter flow output circuit |
| WO2020087958A1 (en) * | 2018-10-31 | 2020-05-07 | 广州小鹏汽车科技有限公司 | Processing method and device relating to foreign object covering ultrasonic radar, and device |
| CN112384763A (en) * | 2018-07-04 | 2021-02-19 | 卡姆鲁普股份有限公司 | Modular ultrasonic flowmeter |
| WO2023197956A1 (en) * | 2022-04-15 | 2023-10-19 | 深圳市帝拓电子有限公司 | Substance parameter detection method and circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105043509A (en) * | 2015-05-22 | 2015-11-11 | 重庆川仪自动化股份有限公司 | Detecting method for liquid ultrasonic flowmeter and detecting system thereof |
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| CN107290013B (en) * | 2017-08-07 | 2020-03-24 | 潍坊奥博仪表科技发展有限公司 | Flow output circuit of dual-channel ultrasonic flowmeter |
| CN112384763A (en) * | 2018-07-04 | 2021-02-19 | 卡姆鲁普股份有限公司 | Modular ultrasonic flowmeter |
| WO2020087958A1 (en) * | 2018-10-31 | 2020-05-07 | 广州小鹏汽车科技有限公司 | Processing method and device relating to foreign object covering ultrasonic radar, and device |
| WO2023197956A1 (en) * | 2022-04-15 | 2023-10-19 | 深圳市帝拓电子有限公司 | Substance parameter detection method and circuit |
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