CN108387278B - A kind of window time automatic adjusting method of ultrasound echo signal - Google Patents
A kind of window time automatic adjusting method of ultrasound echo signal Download PDFInfo
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- CN108387278B CN108387278B CN201810135322.5A CN201810135322A CN108387278B CN 108387278 B CN108387278 B CN 108387278B CN 201810135322 A CN201810135322 A CN 201810135322A CN 108387278 B CN108387278 B CN 108387278B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
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- Measuring Volume Flow (AREA)
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Abstract
The invention discloses a kind of window time automatic adjusting methods of ultrasound echo signal.The mounting temperature sensor on pipeline calculates echo window opening time T according to the concurrent-countercurrent propagation time of ultrasonic transducer measurementyiEcho window opening time T is estimated with by temperature sensortemi, the two compares, if less than 1 echo-signal cycle T of differencet, then the echo window opening time T of ultrasonic transducer derivationyiAs the window opening time in new round flow measurement.If difference is greater than 1 echo-signal cycle Tt, then to certain T0Under water temperature, static flow, the window time T of oscilloscope measurementy0Progress ± 1TtAdjustment, then calculation window opening time T againyi1With window opening time T under Current Temperaturestemi1.And continue to compare.The present invention can efficiently reduce the influence that the decay of echo-signal measures flight time, improve the Stability and veracity of Ultrasonic water meter metering.
Description
Technical field
The invention belongs to flow detection technical fields, are related to a kind of window time adjust automatically side of ultrasound echo signal
Method.
Background technique
A kind of intelligence instrument of the Ultrasonic water meter as novel non-contact, has that crushing is low, precision is high, range ratio is wide and again
The advantages that renaturation is good is gradually applied to the measuring water flow of large and medium-sized caliber.Ultrasonic water meter measuring principle is super by measuring
Generation time is poor due to concurrent-countercurrent speed is different in a fluid for sound wave acoustic beam, mean flow rate is acquired according to the time difference, to be flowed
The accuracy of the integrated flux of piping, time difference measurement directly affects the measuring accuracy of Ultrasonic water meter.By ultrasonic wave fluctuation side
Journey affects the measurement of the time difference, be easy to cause acoustic attenuation, cause it is found that acoustic wave propagation velocity is changed by temperature change
Measurement error is unstable.
Traditional echo signal processing uses cross zero detecting method and threshold method.Cross zero detecting method is a kind of modulating domain analyzing side
Method, it obtains the time interval of zero crossing by the time of tracer signal zero crossing, further according to the relationship of signal period and frequency
Estimate the frequency of signal.Signal, which is mixed into noise signal, will lead to the drift of zero crossing position, therefore zero passage detection is difficult to handle quilt
The ultrasonic echo signal that noise signal is flooded.And threshold value rule is that a threshold voltage is arranged by comparing circuit, works as echo
When signal amplitude is greater than threshold voltage, i.e., it is believed that signal reaches.The shortcomings that threshold method, is it is obvious that be that cannot exclude amplitude first
More than the noise jamming of threshold point；Secondly, the amplitude of ultrasonic signal and temperature are closely related, if echo-signal amplitude is in fluid
In when having larger decay, it may appear that threshold test point forward or moves backward phenomenon, causes echo time measurement inaccuracy.This
Although a little conventional methods can measure the time difference, it can not stablize, accurately measure, to reduce the measurement essence of Ultrasonic water meter
Degree.
Summary of the invention
The present invention is directed to the deficiency of existing echo signal processing method, proposes a kind of window time of ultrasound echo signal
The method of adjust automatically can reduce echo-signal and decay, be mobile forward or backward, and the influence to time difference measurement improves
The Stability and veracity of ultrasonic water meter.
Ultrasound echo signal processing method of the invention is specifically: the mounting temperature sensor on pipeline is changed according to ultrasound
The concurrent-countercurrent propagation time of energy device measurement calculates echo window opening time TyiEstimate that echo window is opened with by temperature sensor
Open time Ttemi, the two compares, if less than 1 echo-signal cycle T of differencet, then the echo of ultrasonic transducer calculating
Window opening time TyiAs the window opening time in new round flow measurement.If difference is greater than 1 echo-signal period
Tt, then to certain T0Under water temperature, static flow, the window time T of oscilloscope measurementy0Progress ± 1TtIt adjusts, then new Ty0It substitutes into
Formula respectively obtains new window opening time Tyi1With window opening time T under Current Temperaturestemi1。Tyi1With Ttemi1The two after
It is continuous to compare, if the two difference is in an echo cycle TtIt is interior, then new Tyi1As the echo window in flow measurement next time
Opening time, it is on the contrary then to Ty0Continue to adjust, until Tyi1With Ttemi1Difference in an echo cycle TtIt is interior.Wherein Tyi
The timing since pumping signal, until the wave trough position time of the previous peak value wave near echo-signal peak-peak wave.
Present invention employs the methods that timing prejudges the echo-signal window opening time, prevent ultrasound echo signal because of temperature
Echo-signal amplitude attenuation caused by degree, flow field change, overall waveform are moved forward and backward, and threshold test point is caused to move forward or backward
It is dynamic to cause biggish measurement error.When ultrasonic wave transmits in water, echo reception processing function is closed, when the window opening time
Equal to TyiWhen, to improve signal-to-noise ratio, TyiThe timing since pumping signal, to echo-signal peak-peak wave near it is previous
Until the wave trough position time of peak value wave, time measurement chip starts to receive and process echo-signal.When time measurement chip is adopted
After collecting a certain number of pulse signals, echo signal processing close.
The beneficial effects of the present invention are: echo-signal window opening time automatic adjusting method of the invention, Neng Gouyou
Effect ground reduces the influence that the decay of echo-signal measures flight time, improves the accuracy and stabilization of Ultrasonic water meter metering
Property, it is built for wisdom water utilities and smart city and provides guarantee.
Detailed description of the invention
Fig. 1 is Ultrasonic water meter pipeline model and energy converter scheme of installation
Fig. 2 is conventional hardware threshold method measuring principle figure；
Fig. 3 is the threshold point detection schematic diagram that echo-signal is mingled with noise signal；
Fig. 4 is echo-signal amplitude attenuation schematic diagram；
Fig. 5 is window opening time instrumentation plan；
Fig. 6 is true wave window time and derivation wave window time；
Fig. 7 is echo-signal window opening time automatic adjusting method flow chart.
Specific embodiment
A kind of window time adjust automatically of ultrasound echo signal proposed by the present invention that the following is further explained with reference to the attached drawings
Method.
Referring to Fig.1, Ultrasonic water meter pipeline model and energy converter, temperature sensor scheme of installation are as shown, the present invention
Mainly using time difference method as flow-measuring method, acoustic poth arrangement mode is using retraction pipeline model that is U-shaped, embedding reflector plate.
Selected pipe diameter is D, and the centre-height of two reflectings surface is the centre-height of pipeline, and the horizontal distance of the two is L,
The distance of energy converter to reflector plate is L1, the angle for being retracted the extended line intersection of pipeline is θ, and temperature sensor is placed under pipeline
Swim a distance behind reflector plate.It can be in the hope of fair current time t by Fig. 1 modelABWith adverse current time tBA。
Wherein C is the spread speed of ultrasonic wave in water, and V is the flow velocity of circulating water, then subtracting (1) formula by (2) formula can ask
Obtain concurrent-countercurrent time difference Dt are as follows:
Since the spread speed C of ultrasonic wave in water is much larger than the flow velocity V of water, the flow velocity V of water can be obtained by (3) formula are as follows:
Due to the horizontal distance L given value between the spread speed C and reflector plate of ultrasonic wave in water, by (4) formula it is found that
Only require the flow velocity of water just can be obtained in concurrent-countercurrent time difference Dt.
Fig. 2 is conventional hardware threshold method measuring principle figure.Conventional ultrasonic wave echo-signal is using hardware threshold method to echo
Signal is handled, i.e., modelled signal compares processing circuit the threshold point of echo-signal is arranged on hardware, works as echo-signal
Peak-to-peak value be more than compare processing circuit setting threshold point, then it is assumed that echo-signal reach.
Fig. 3 is the threshold point detection schematic diagram that echo-signal is mingled with noise signal.General conventional hardware threshold method setting
Threshold point is first wave crest neighbouring position of echo-signal, and since echo-signal transmission time emitting pumping signal to echo
Until signal reaches threshold point.However in real process, echo-signal is easy to be mingled with noise signal, and the peak value of noise signal is very
It is well over the minimum peak-to-peak value of echo-signal, causes above-mentioned transmission time inaccurate.If increasing the excitation letter of Ultrasonic water meter
Number, although the minimum peak-to-peak value of echo-signal can be increased, also increase the power consumption of Ultrasonic water meter.
Fig. 4 is echo-signal amplitude attenuation schematic diagram.Generally improve conventional threshold values method selection echo-signal second or
Nearby for voltage as threshold test voltage, although improve threshold test voltage reduces noise signal to the amplitude of person's third echo
Interference, however due to the complexity of flow fields environment, the amplitude of echo-signal also will appear relaxation phenomenon shown in Fig. 4.When return
After the amplitude of wave signal becomes larger or becomes smaller, although arrival time difference can be continued to obtain, differ larger with true flight time, shadow
The measurement accuracy and stability of Ultrasonic water meter are rung.
Fig. 5 is window opening time instrumentation plan.The method that the present invention selects the timing echo-signal window opening time,
I.e. using in ultrasonic wave in water transmission process, echo reception processing function is closed, and is equal to T when the window opening timeyiWhen, to mention
High s/n ratio, TyiThe timing since pumping signal, to echo-signal peak-peak wave near previous peak value wave trough position
Until setting the time, High speed time measurement chip starts to receive and process echo-signal.When the acquisition of High speed time measurement chip is certain
After quantity pulse signal, echo signal processing close.
When water temperature is T0When, an echo-signal window opening time T can be determined by oscillography0, then calculate water temperature and be
T0When ultrasonic wave velocity of sound C in water0.By the available arbitrary temp T of formula (5)iUnder window opening time Tyi。
C in formulaiFor TiAt a temperature of the velocity of sound of ultrasonic wave in water, at this temperature High speed time measurement chip survey fair current when
Between tAB, adverse current time tBA, T can be acquired by formula (1) and formula (2)iAt a temperature of Ci。
By controlling echo-signal window opening time Tyi, significantly reduce interference of the noise signal to echo-signal.
If there is entirety forward or moves backward, above-mentioned control echo-signal window opening time T in echo-signalyiMethod, though
It can so continue to acquire the flight time of echo-signal, but the flight time that will lead to measurement has large error.
Fig. 6 is true wave window time and derivation wave window time.Assuming that at a temperature of certain, the window time of true wave arrival
It is as shown in Figure 6 that position and High speed time measurement chip acquisition flight time derive the window time position that wave reaches.If according to
The window time for deriving wave is arranged to the window opening time, although High speed time measurement chip can acquire certain pulse signal
Echo Processing function is turned off later, but differs larger with practical wave arrival time, leads to the reduction of Ultrasonic water meter measurement accuracy.
Method of the invention can measure by the mounting temperature sensor on pipeline when the water temperature T in preceding pipelinetemi, look into
It askes and calculates the velocity of sound C of ultrasonic wave in water under Current Temperaturestemi, echo-signal under Current Temperatures can then be estimated by formula (7)
Window opening time Ttemi。
T in formulay0It is still certain temperature T0When, the echo-signal window opening time obtained by oscillograph, C0For T0At a temperature of surpass
The speed of sound wave in water.Before determining the echo window opening time, calculated separately first according to formula (5) and formula (7)
Its echo window opening time out.The echo window opening time T calculated by comparing ultrasonic transduceryiEstimate with temperature sensor
The echo window time T of calculationtemi, with the echo window opening time T of temperature sensor estimationtemiOn the basis of be worth, work as ultrasonic transduction
The echo window opening time that device calculates is in TtemiWhen in ± 1 echo-signal period, then using the echo of ultrasonic transducer calculating
Window opening time TyiAs the echo-signal window opening time.Conversely, the window opening time T then obtained to oscillography0±
1 echo-signal period was adjusted, and obtained the echo window opening time T that a new ultrasonic transducer calculatesyi1, and it is new
The echo window opening time T of temperature sensor estimationtemi1It compares, until the two difference is within ± 1 echo-signal period.
Echo-signal window opening time automatic adjusting method flow chart of the invention is as shown in Figure 7.This method can be
The echo window opening time under different temperatures is adjusted, and effectively control processing is carried out to above-mentioned shifting wave phenomenon, to ultrasound
The Stability and veracity of water meter provides guarantee.
Claims (4)
1. a kind of window time automatic adjusting method of ultrasound echo signal, which is characterized in that according to ultrasonic transducer measurement
The concurrent-countercurrent propagation time calculates echo window opening time TyiEcho window opening time T is estimated with by temperature sensortemi,
The two compares, if less than 1 echo-signal cycle T of differencet, then echo window opening time TyiAs new round stream
The window opening time of measurement；If difference is greater than 1 echo-signal cycle Tt, then to certain T0Under water temperature, static flow, show
The window time T of wave device measurementy0Progress ± 1TtAdjustment, then in new window time Ty0When carrying out the propagation of ultrasonic wave concurrent-countercurrent
Between and temperature measurement, new window opening time T is calculatedyi1With window opening time T under Current Temperaturestemi1；Tyi1With
Ttemi1The two continues to compare, if the two difference is in an echo cycle TtIt is interior, then new Tyi1As in flow measurement next time
The echo window opening time, it is on the contrary then to Ty0Continue to adjust, until Tyi1With Ttemi1Difference in an echo cycle Tt
It is interior.
2. the window time automatic adjusting method of ultrasound echo signal according to claim 1, which is characterized in that described time
Wave window opening time TyiThe timing since pumping signal, to echo-signal peak-peak wave near previous peak value wave wave
Until the time of paddy position, time measurement chip starts to receive and process echo-signal；When time measurement chip acquires certain amount
After pulse signal, echo signal processing function is closed.
3. the window time automatic adjusting method of ultrasound echo signal according to claim 1, which is characterized in that described time
Wave window opening time TyiCalculation formula are as follows:
C in formula0For T0The speed of ultrasonic wave in water, C under water temperatureiFor TiThe velocity of sound of ultrasonic wave in water under water temperature.
4. the window time automatic adjusting method of ultrasound echo signal according to claim 1, which is characterized in that measuring
Pipeline on mounting temperature sensor, water temperature T of the measurement in the preceding pipelinei, inquiry calculate Current Temperatures under ultrasonic wave in water
Velocity of sound Ctemi, temperature sensor estimation echo window opening time TtemiCalculation formula are as follows:
C in formula0For T0The speed of ultrasonic wave in water under water temperature.
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109696217B (en) * | 2018-12-20 | 2021-06-22 | 金卡智能集团股份有限公司 | Method for adjusting metering data of ultrasonic gas meter |
| CN111351958B (en) * | 2018-12-21 | 2021-11-02 | 上海华虹计通智能系统股份有限公司 | Time delay detection method and device, and fluid speed measurement method and system |
| CN110017875B (en) * | 2019-03-12 | 2024-08-23 | 宁波水表(集团)股份有限公司 | Vibration eliminating method for ultrasonic water meter |
| CN110207771B (en) * | 2019-06-14 | 2020-08-04 | 浙江启尔机电技术有限公司 | Single-channel continuous multi-ultrasonic-signal synchronous timing circuit and timing method thereof |
| CN111323101B (en) * | 2020-03-24 | 2022-01-04 | 成都千嘉科技有限公司 | Self-adaptive automatic calibration method for ultrasonic meter |
| CN112284469B (en) * | 2020-10-20 | 2024-03-19 | 重庆智慧水务有限公司 | Zero drift processing method of ultrasonic water meter |
| CN113418572A (en) * | 2021-06-18 | 2021-09-21 | 重庆市山城燃气设备有限公司 | Signal authenticity detection system and method of flowmeter and gas metering equipment |
| CN114923531B (en) * | 2022-07-21 | 2022-10-11 | 成都千嘉科技股份有限公司 | Threshold value self-adaptive adjusting method and ultrasonic metering device self-adaptive metering method |
| CN118089869B (en) * | 2024-04-28 | 2024-06-28 | 杭州山科智能科技股份有限公司 | Ultrasonic water meter echo characteristic peak searching method, device, equipment and medium |
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Denomination of invention: A Method for Automatically Adjusting the Window Time of Ultrasonic Echo Signal Effective date of registration: 20230621 Granted publication date: 20191108 Pledgee: Industrial and Commercial Bank of China Limited Hangzhou Yuhang sub branch Pledgor: HANGZHOU SECK INTELLIGENT TECHNOLOGY CO.,LTD. Registration number: Y2023330001220 |
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