CN209117716U - A kind of acoustic Doppler Flow speed measurer and direction measuring device - Google Patents
A kind of acoustic Doppler Flow speed measurer and direction measuring device Download PDFInfo
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- CN209117716U CN209117716U CN201821610183.9U CN201821610183U CN209117716U CN 209117716 U CN209117716 U CN 209117716U CN 201821610183 U CN201821610183 U CN 201821610183U CN 209117716 U CN209117716 U CN 209117716U
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Abstract
The utility model relates to a kind of acoustic Doppler Flow speed measurer and flow to measurement method, used system includes ultrasonic transducer A, ultrasonic transducer drive circuit, programmable clock, ultrasonic transducer B, the synchronous ADC of signal processing module A, signal processing module B, signal processing module C, frequency mixer A, frequency mixer B, binary channels, controller and power supply system, ultrasonic transducer A is connected to signal processing module A input terminal, and signal processing module A output end is connect with the input terminal of frequency mixer A and frequency mixer B respectively.The utility model method can measure the flow direction of testing medium, using effect is good by carrying out orthogonal mixing to Doppler ultra sonic wave flow speed instrument echo-signal simultaneously on the basis of measuring medium flow velocity.
Description
Technical field
The utility model relates to a kind of acoustic Doppler Flow speed measurer and direction measuring devices, belong to automatic technology neck
Domain.
Background technique
Acoustic doppler velocimeter is measurement instrument made of applied acoustics Doppler effect principle, using ultrasonic transducer,
With ultrasonic listening flow velocity.Measurement point does not destroy flow field in the front of probe, has measurement accuracy height, broad quantum；Weak current can be surveyed
High current can also be surveyed；High resolution, fast response time；Instantaneous velocity can be surveyed and also survey mean flow rate；Measurement is linear, and flow velocity calibrating is bent
Line is not easy to change；Mechanical rotating part, there is no silt blockings and water plant to wind problem；It pops one's head in sturdy and durable, is hardly damaged,
The advantages that easy to operate.Traditional Doppler ultra sonic wave flow speed instrument calculates flow velocity using Doppler effect, but stream cannot be distinguished
To.
Utility model content
It is orthogonal by carrying out to Doppler ultra sonic wave flow speed instrument echo-signal that the purpose of this utility model is to provide one kind
Mixing can measure the flow direction of testing medium simultaneously on the basis of measuring medium flow velocity.
To achieve the goals above, the technical solution of the utility model is as follows.
A kind of acoustic Doppler Flow speed measurer and direction measuring device, used system include ultrasonic transducer A,
Ultrasonic transducer drive circuit, programmable clock, ultrasonic transducer B, signal processing module A, signal processing module B, letter
The synchronous ADC of number processing module C, frequency mixer A, frequency mixer B, binary channels, controller and power supply system, ultrasonic transducer A connection
In signal processing module A input terminal, signal processing module A output end is connect with the input terminal of frequency mixer A and frequency mixer B respectively；
The output end of frequency mixer A and frequency mixer B are connect with the input terminal of signal processing module B and signal processing module C respectively；At signal
Manage the output end ADC input terminal connection synchronous with binary channels of module B and signal processing module C；Binary channels synchronizes ADC output end
It is connect with the input terminal of controller, the output end of controller is connect with programmable clock input terminal；The output end of programmable clock
It is connect respectively with frequency mixer A, frequency mixer B and ultrasonic transducer drive circuit input terminal；Ultrasonic transducer drive circuit is defeated
Outlet is connect with ultrasonic transducer B input terminal；Above-mentioned connection is all made of the connection of signal data line；Power supply system is equipped with power supply
Line respectively with ultrasonic transducer A, ultrasonic transducer drive circuit, programmable clock, ultrasonic transducer B, signal processing
The synchronous ADC of modules A, signal processing module B, signal processing module C, frequency mixer A, frequency mixer B, binary channels, controller are electrically connected；Control
Device processed is equipped with communication interface；Clock A, clock B and clock C are equipped in programmable clock.
In the modular system, programmable clock exports three tunnel clock signals under the control of the controller, and frequency is f0,
Wherein clock A is consistent with the phase of clock B, and clock C is orthogonal with clock B, two signals there are 90 degree of phase difference, clock A's
Signal is amplified signal by ultrasonic transducer drive module, final to drive ultrasonic transducer B by the electricity of f0 frequency
Signal is converted to ultrasonic signal and is emitted in testing medium.The ultrasonic signal of transmitting is reflected by solid particle in testing medium
Afterwards, it is received by ultrasonic transducer A, acoustic signals is converted into electric signal, signal is very faint at this time, and might have interference
Signal, this signal obtain a clean echo-signal by signal processing module A amplification filtering, echo-signal due to by
To Doppler effect, frequency at this time has not been that frequency emitted originally, and echo frequency f1, f1 signal is divided into two
Road, enters frequency mixer A all the way by direct 1 point 2, and another way enters frequency mixer B, frequency mixer A and frequency mixer B another way clock signal
It is clock B and clock C respectively, there are 90 degree of phase differences, the frequency exported from frequency mixer A is | f0-f1 |, exported from frequency mixer B
Frequency be similarly | f0-f1 | signal, this two paths of signals respectively enters signal processing module B and signal processing module C again, will
Signal is filtered, and amplification does not change frequency and phase, is only changed amplitude, is obtained clean | f0-f1 | signal, this | f0-
F1 | it is exactly Doppler effect frequency displacement, this frequency displacement is directly proportional to particle speed of related movement in testing medium, it is assumed that ratio p,
Therefore it can be concluded that the flow velocity v=p* of testing medium | f0-f1 |, above-mentioned flow velocity is actually the speed of medium type molecule
Degree, it is almost consistent with liquid velocity.
Frequency and phase measurement rely on double channel A/D C and control module, and the signal after mixing is from signal processing module B
After entering the synchronous ADC of a binary channels after coming out with signal processing module C, digital signal is converted electrical signals to, control is passed to
The frequency f1 and phase w0, w1 of two signals can be calculated in device processed, the binary channels electric signal that controller is acquired according to this,
Two signal frequencies are the same, but phase is different, since the frequency mixer of process is different.
Formula v=p* above | f0-f1 | in, Doppler effect frequency displacement at this time is an absolute value, but frequency displacement in practice
Be by positive and negative, it is positive and negative to represent the direction of relative movement of testing medium Yu Doppler ultra sonic wave flow speed instrument, due to conventional more
General ultrasonic current metre of strangling can only measure the absolute value of frequency displacement, be determined by frequency mixer, frequency mixer can only obtain two signals
Frequency and difference on the frequency with two signals, but signal frequency can not be negative, therefore be an absolute value, this modular system
By increasing a frequency mixer B, it is that frequency mixer local oscillator clock C is orthogonal with clock B with the difference of frequency mixer A, two at this time
The frequency of frequency mixer output is the same, but phase is different, when testing medium and Doppler ultra sonic wave flow speed instrument are opposing stationary
When, Doppler frequency shift 0, no signal (w0=w1=0), when testing medium forward motion opposite with Doppler ultra sonic wave flow speed instrument
When, Doppler frequency shift is | f0-f1 |, phase w0 > w1, when testing medium counter motion opposite with Doppler ultra sonic wave flow speed instrument
When, Doppler frequency shift is | f0-f1 |, phase w0 < w1, therefore, this modular system are surveyed in common Doppler ultra sonic wave flow speed instrument
On the basis of measuring flow velocity, the direction of testing medium relative motion can be measured.
Power supply system is powered to other modules.
The beneficial effect of the utility model is: the utility model method is by believing Doppler ultra sonic wave flow speed instrument echo
Number orthogonal mixing is carried out, the flow direction of testing medium can be measured simultaneously on the basis of measuring medium flow velocity, use effect
Fruit is good.
Detailed description of the invention
Fig. 1 is model system functional block diagram used in the utility model embodiment.
Specific embodiment
Specific embodiment of the present utility model is described below with reference to embodiment, it is practical to better understand
It is novel.
Embodiment
Acoustic Doppler Flow speed measurer in the present embodiment and flow to measurement method, the functional block diagram of used system
As shown in Figure 1, including ultrasonic transducer A, ultrasonic transducer drive circuit, programmable clock, ultrasonic transducer B, letter
Number processing module A, signal processing module B, signal processing module C, frequency mixer A, frequency mixer B, binary channels synchronous ADC, controller
And power supply system, ultrasonic transducer A are connected to signal processing module A input terminal, signal processing module A output end respectively with it is mixed
Frequency device A is connected with the input terminal of frequency mixer B；The output end of frequency mixer A and frequency mixer B respectively with signal processing module B and signal
The input terminal of processing module C connects；The output end of signal processing module B and signal processing module C ADC synchronous with binary channels are defeated
Enter end connection；The input terminal of the synchronous ADC output end of binary channels and controller connects, and the output end and programmable clock of controller are defeated
Enter end connection；The output end of programmable clock respectively with frequency mixer A, frequency mixer B and ultrasonic transducer drive circuit input terminal
Connection；Ultrasonic transducer drive circuit output end is connect with ultrasonic transducer B input terminal；Above-mentioned connection is all made of signal number
It is connected according to line；Power supply system be equipped with power supply line respectively with ultrasonic transducer A, ultrasonic transducer drive circuit, programmable
Clock, ultrasonic transducer B, signal processing module A, signal processing module B, signal processing module C, frequency mixer A, frequency mixer B,
Binary channels synchronizes ADC, controller is electrically connected；Controller is equipped with communication interface；In programmable clock be equipped with clock A, clock B and when
Clock C.
In the modular system, programmable clock exports three tunnel clock signals under the control of the controller, and frequency is f0,
Wherein clock A is consistent with the phase of clock B, and clock C is orthogonal with clock B, two signals there are 90 degree of phase difference, clock A's
Signal is amplified signal by ultrasonic transducer drive module, final to drive ultrasonic transducer B by the electricity of f0 frequency
Signal is converted to ultrasonic signal and is emitted in testing medium.The ultrasonic signal of transmitting by solid particle in testing medium (with
For water: bubble or suspended particulate in water, are not pure water here, usually the water in nature, all contain subtle particle
Object) reflection after, received by ultrasonic transducer A, acoustic signals be converted into electric signal, signal is very faint at this time, and may
Interference signal is had, this signal obtains a clean echo-signal, echo letter by signal processing module A amplification filtering
Number due to by Doppler effect, frequency at this time has not been that frequency emitted originally, echo frequency f1, f1 letter
Number it is divided into two-way, direct 1 point 2, enters frequency mixer A all the way, another way enters frequency mixer B, frequency mixer A and frequency mixer B another way
Clock signal is clock B and clock C respectively, and there are 90 degree of phase differences, the frequency exported from frequency mixer A is | f0-f1 |, from mixing
The frequency of device B output is similarly | f0-f1 | signal, this two paths of signals respectively enters signal processing module B and signal processing again
Module C, signal is filtered, and amplification does not change frequency and phase, is only changed amplitude, is obtained clean | f0-f1 | signal,
This | f0-f1 | it is exactly Doppler effect frequency displacement, this frequency displacement is directly proportional to particle speed of related movement in testing medium, false
If ratio be p, therefore it can be concluded that testing medium flow velocity v=p* | f0-f1 |, above-mentioned flow velocity is actually that medium type is small
The speed of particle, it is almost consistent with liquid velocity.
Frequency and phase measurement rely on double channel A/D C and control module, and the signal after mixing is from signal processing module B
After entering the synchronous ADC of a binary channels after coming out with signal processing module C, digital signal is converted electrical signals to, control is passed to
The frequency f1 and phase w0, w1 of two signals can be calculated in device processed, the binary channels electric signal that controller is acquired according to this,
Two signal frequencies are the same, but phase is different, since the frequency mixer of process is different.
Formula v=p* above | f0-f1 | in, Doppler effect frequency displacement at this time is an absolute value, but frequency displacement in practice
Be by positive and negative, it is positive and negative to represent the direction of relative movement of testing medium Yu Doppler ultra sonic wave flow speed instrument, due to conventional more
General ultrasonic current metre of strangling can only measure the absolute value of frequency displacement, be determined by frequency mixer, frequency mixer can only obtain two signals
Frequency and difference on the frequency with two signals, but signal frequency can not be negative, therefore be an absolute value, this modular system
By increasing a frequency mixer B, it is that frequency mixer local oscillator clock C is orthogonal with clock B with the difference of frequency mixer A, two at this time
The frequency of frequency mixer output is the same, but phase is different, when testing medium and Doppler ultra sonic wave flow speed instrument are opposing stationary
When, Doppler frequency shift 0, no signal (w0=w1=0), when testing medium forward motion opposite with Doppler ultra sonic wave flow speed instrument
When, Doppler frequency shift is | f0-f1 |, phase w0 > w1, when testing medium counter motion opposite with Doppler ultra sonic wave flow speed instrument
When, Doppler frequency shift is | f0-f1 |, phase w0 < w1, therefore, this modular system are surveyed in common Doppler ultra sonic wave flow speed instrument
On the basis of measuring flow velocity, the direction of testing medium relative motion can be measured.
Power supply system is powered to other modules.
The above is preferred embodiments of the present invention, it is noted that for the ordinary skill of the art
For personnel, without departing from the principle of this utility model, several improvements and modifications can also be made, these are improved and profit
Decorations are also considered as the protection scope of the utility model.
Claims (1)
1. a kind of acoustic Doppler Flow speed measurer and direction measuring device, it is characterised in that: used system includes ultrasound
Wave transducer A, ultrasonic transducer drive circuit, programmable clock, ultrasonic transducer B, at signal processing module A, signal
Manage the synchronous ADC of module B, signal processing module C, frequency mixer A, frequency mixer B, binary channels, controller and power supply system, ultrasonic waves
Energy device A is connected to signal processing module A input terminal, and signal processing module A output end is defeated with frequency mixer A and frequency mixer B respectively
Enter end connection；The output end of frequency mixer A and frequency mixer B connect with the input terminal of signal processing module B and signal processing module C respectively
It connects；The ADC input terminal connection synchronous with binary channels of the output end of signal processing module B and signal processing module C；Binary channels is synchronous
The connection of the input terminal of ADC output end and controller, the output end of controller are connect with programmable clock input terminal；Programmable clock
Output end connect respectively with frequency mixer A, frequency mixer B and ultrasonic transducer drive circuit input terminal；Ultrasonic transducer drives
Dynamic circuit output end is connect with ultrasonic transducer B input terminal；Above-mentioned connection is all made of the connection of signal data line；In power supply system
Equipped with power supply line respectively with ultrasonic transducer A, ultrasonic transducer drive circuit, programmable clock, ultrasonic transducer B,
The synchronous ADC of signal processing module A, signal processing module B, signal processing module C, frequency mixer A, frequency mixer B, binary channels, control
Device is electrically connected；Controller is equipped with communication interface；Clock A, clock B and clock C are equipped in programmable clock.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821610183.9U CN209117716U (en) | 2018-09-30 | 2018-09-30 | A kind of acoustic Doppler Flow speed measurer and direction measuring device |
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| CN201821610183.9U CN209117716U (en) | 2018-09-30 | 2018-09-30 | A kind of acoustic Doppler Flow speed measurer and direction measuring device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110596713A (en) * | 2019-09-19 | 2019-12-20 | 电子科技大学 | Acoustic Doppler flow measurement system |
| CN111830280A (en) * | 2020-07-23 | 2020-10-27 | 广州海事科技有限公司 | Flow velocity and flow monitoring method and system, computer equipment and storage medium |
| CN113552383A (en) * | 2021-07-29 | 2021-10-26 | 深圳市宏电技术股份有限公司 | Bidirectional Doppler velocimeter and bidirectional Doppler velocimetry method |
| CN115639377A (en) * | 2022-10-24 | 2023-01-24 | 福建澳泰自动化设备有限公司 | Underwater acoustic Doppler positive and negative flow measurement method and system |
-
2018
- 2018-09-30 CN CN201821610183.9U patent/CN209117716U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110596713A (en) * | 2019-09-19 | 2019-12-20 | 电子科技大学 | Acoustic Doppler flow measurement system |
| CN111830280A (en) * | 2020-07-23 | 2020-10-27 | 广州海事科技有限公司 | Flow velocity and flow monitoring method and system, computer equipment and storage medium |
| CN113552383A (en) * | 2021-07-29 | 2021-10-26 | 深圳市宏电技术股份有限公司 | Bidirectional Doppler velocimeter and bidirectional Doppler velocimetry method |
| CN115639377A (en) * | 2022-10-24 | 2023-01-24 | 福建澳泰自动化设备有限公司 | Underwater acoustic Doppler positive and negative flow measurement method and system |
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