CN201255644Y - Synchronous transceiving time difference type supersonic flowmeter - Google Patents
Synchronous transceiving time difference type supersonic flowmeter Download PDFInfo
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- CN201255644Y CN201255644Y CNU2008200385269U CN200820038526U CN201255644Y CN 201255644 Y CN201255644 Y CN 201255644Y CN U2008200385269 U CNU2008200385269 U CN U2008200385269U CN 200820038526 U CN200820038526 U CN 200820038526U CN 201255644 Y CN201255644 Y CN 201255644Y
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- time difference
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Abstract
The utility model discloses a synchronous receiving and sending time difference ultrasonic flow meter which comprises an energy converter used to send ultrasonic wave to an opposite end, an ultrasonic signal sending and receiving conversion circuit used to receive the ultrasonic signal of the energy converter and receive the pulse signal of a transmitting circuit, a signal filter amplification circuit used to reduce the output fluctuation and amplify the output signal, an A/D conversion circuit used to convert the analog signal into digital signal, an MCU used to read the digital signal and send the signal to the transmitting circuit, and a transmitting circuit used to receive the signal sent by the MCU and the transmitted pulse. The synchronous receiving and sending time difference ultrasonic flow meter is simpler, has higher measuring speed, and can really reflect the flowing speed and the flow information in measurement.
Description
Technical field
The utility model relates to a kind of transit-time ultrasonic flow meter, especially relates to a kind of synchronous transmitting-receiving transit-time 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, therefore have clear superiority aspect the middle large-caliber flow measurement.
The domestic and international at present transit-time ultrasonic flow meter that uses, the measurement in forward-propagating time and reverse travel-time is that timesharing realizes, switching between forward-propagating time and reverse travel-time has certain time-delay inevitably, when if change in flow is very fast, this time-delay will produce the error on the fluid-velocity survey, if use multi-paths to measure large hydropower station or defeated water system, this error will continue to enlarge.
In addition, in order to make the reception function receive effective ultrasonic signal, transponder pulse voltage at transmitter terminal will be up to 400V even 1000V, and so high voltage is selected all to bring very big pressure to board design and components and parts, has also increased the frequency that transmitter breaks down.Even so, transit-time ultrasonic flow meter signal in complex environment still might be flooded by neighbourhood noise, and traditional threshold method and zero passage method will be difficult to realize in conjunction with measuring the time difference.
Summary of the invention
1, goal of the invention
At above-mentioned the deficiencies in the prior art, the technical problems to be solved in the utility model provides a kind of signal Synchronization transmitting-receiving transit-time ultrasonic flow meter, promptly just reverse transducer is launched ultrasonic signal simultaneously, while opening signal receiver after certain time-delay, utilize cross-correlation technique to handle to the received signal, disposablely obtain forward-propagating time and reverse travel-time.This utility model has been simplified measuring method, has reduced the requirement to emission voltage, has reduced the measuring error of being brought by time-delay.
2, technical scheme
In order to reach above purpose, the technical solution adopted in the utility model is as follows:
The utility model comprises, transducer, ultrasonic signal transmitting-receiving change-over circuit, signal filtering amplifying circuit, A/D change-over circuit, MCU, radiating circuit.
Wherein, transducer is used for to opposite end emission ultrasound wave;
Ultrasonic signal transmitting-receiving change-over circuit is used for the ultrasonic signal of receiving transducer and receives the pulse signal of radiating circuit;
The signal filtering amplifying circuit is used to the fluctuation that reduces to export and amplifies output signal;
The A/D change-over circuit, being used for analog signal conversion is digital signal;
MCU is used to read digital signal and sends it to radiating circuit;
Radiating circuit is used to receive signal and the transponder pulse that MCU sends.
3, beneficial effect
The beneficial effect that the utlity model has is:
1) the utility model only need carry out a signal transmitting and receiving job and can obtain the just reverse travel-time, thereby obtains flow velocity and flow information.Measure just reverse travel-time method with timesharing and compare, the utility model measurement is simpler, measuring speed is faster, more can reflect truly to measure flow velocity and flow information constantly.
2) improved the antijamming capability that installs, reduced requirement, be submerged in the neighbourhood noise, also can obtain useful information by correlation technique even transmit to emission voltage.
3) saved operation time and hardware resource, realized convenient simple and direct.
Description of drawings
Accompanying drawing is a synoptic diagram of the present utility model, and wherein A, B are transducers.
Embodiment
The utility model to end sensor is sent ultrasonic signal, is opened receiving circuit simultaneously, and is obtained the just reverse travel-time with related algorithm simultaneously before ultrasonic signal arrives the opposite end, thereby obtains flow velocity and flow information.This utility model simplified measurement method, reduce measuring error and significantly reduce requirement Signal-to-Noise.
Implementation step is as follows:
1) as shown in drawings, transmitter is opened, and transducer A and transducer B are simultaneously to opposite end emission ultrasound wave; For the more fluid of impurity, can use the waveform of dipulse or three pulse shapings to improve measuring accuracy.
2) through certain time-delay, arrive opposite end front opening two sensors receiving circuit at ultrasonic signal, receive waveform, neighbourhood noise is arranged in the waveform.
3) receive waveform and carry out related operation with transmitted waveform, by corresponding calculating get final product forward-propagating time (corresponding first crest) and reverse travel-time (second crest of correspondence), and then acquisition flow velocity and flow information.
If flow velocity when very slow, can only be found a crest (forward direction transmission waveform and reverse transmitted waveform are overlapped) on Wave data, the waveform similarity with fluid when static brings difficulty to fluid-velocity survey at this moment.If think that at this point fluid is static, obvious errors is bigger, for head it off has two kinds of solutions:
1) improves the transducer frequency of operation;
2) after the A transducer sent ultrasound wave, the B transducer was launched through certain time-delay again, and all the other methods of operating and step are constant, just will deduct this time-delay when calculating reverse travel-time and just can obtain the just genuine reverse travel-time.
Claims (1)
1, a kind of synchronous transmitting-receiving transit-time ultrasonic flow meter is characterized in that, comprises
Transducer is used for to opposite end emission ultrasound wave;
Ultrasonic signal transmitting-receiving change-over circuit is used for the ultrasonic signal of receiving transducer and receives the pulse signal of radiating circuit;
The signal filtering amplifying circuit is used to the fluctuation that reduces to export and amplifies output signal;
The A/D change-over circuit, being used for analog signal conversion is digital signal;
MCU is used to read digital signal and sends it to radiating circuit;
Radiating circuit is used to receive signal and the transponder pulse that MCU sends.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200385269U CN201255644Y (en) | 2008-08-08 | 2008-08-08 | Synchronous transceiving time difference type supersonic flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200385269U CN201255644Y (en) | 2008-08-08 | 2008-08-08 | Synchronous transceiving time difference type supersonic flowmeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201255644Y true CN201255644Y (en) | 2009-06-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200385269U Expired - Lifetime CN201255644Y (en) | 2008-08-08 | 2008-08-08 | Synchronous transceiving time difference type supersonic flowmeter |
Country Status (1)
| Country | Link |
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| CN (1) | CN201255644Y (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| CN104101647A (en) * | 2013-04-15 | 2014-10-15 | 中国石油化工股份有限公司 | System and method for testing supersonic-wave speed of rock under simulated reservoir conditions |
| CN104502626A (en) * | 2014-12-03 | 2015-04-08 | 国网河南省电力公司电力科学研究院 | High-dynamic-response oil flow rate measuring device and measuring method |
| CN104748805A (en) * | 2015-04-10 | 2015-07-01 | 吉安精程仪表科技有限公司 | Ultrasonic flow measurement method based on direct phase difference |
| CN104897249A (en) * | 2015-06-24 | 2015-09-09 | 中国地质大学（武汉） | Ultrasonic flow measuring test device and measuring method |
-
2008
- 2008-08-08 CN CNU2008200385269U patent/CN201255644Y/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| CN104101647A (en) * | 2013-04-15 | 2014-10-15 | 中国石油化工股份有限公司 | System and method for testing supersonic-wave speed of rock under simulated reservoir conditions |
| CN104502626A (en) * | 2014-12-03 | 2015-04-08 | 国网河南省电力公司电力科学研究院 | High-dynamic-response oil flow rate measuring device and measuring method |
| CN104748805A (en) * | 2015-04-10 | 2015-07-01 | 吉安精程仪表科技有限公司 | Ultrasonic flow measurement method based on direct phase difference |
| CN104897249A (en) * | 2015-06-24 | 2015-09-09 | 中国地质大学（武汉） | Ultrasonic flow measuring test device and measuring method |
| CN104897249B (en) * | 2015-06-24 | 2018-01-05 | 中国地质大学（武汉） | A kind of measuring ultrasonic wave flow experimental rig and measuring method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20090610 |
|
| CX01 | Expiry of patent term |