CN110169786A - A kind of ultrasonic drive circuit, driving method and ultrasonic lung function instrument - Google Patents
A kind of ultrasonic drive circuit, driving method and ultrasonic lung function instrument Download PDFInfo
- Publication number
- CN110169786A CN110169786A CN201910423338.0A CN201910423338A CN110169786A CN 110169786 A CN110169786 A CN 110169786A CN 201910423338 A CN201910423338 A CN 201910423338A CN 110169786 A CN110169786 A CN 110169786A
- Authority
- CN
- China
- Prior art keywords
- transmitting
- module
- ultrasonic
- receiving module
- capacitor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000004199 lung function Effects 0.000 title claims abstract description 20
- 230000003321 amplification Effects 0.000 claims abstract description 33
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 33
- 239000003990 capacitor Substances 0.000 claims description 58
- 238000004891 communication Methods 0.000 claims description 7
- 230000005611 electricity Effects 0.000 claims description 7
- 238000002604 ultrasonography Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 5
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 238000011144 upstream manufacturing Methods 0.000 description 11
- 239000012530 fluid Substances 0.000 description 9
- 238000012360 testing method Methods 0.000 description 8
- 238000005259 measurement Methods 0.000 description 7
- 230000002411 adverse Effects 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 208000023504 respiratory system disease Diseases 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000002045 lasting effect Effects 0.000 description 2
- 230000000644 propagated effect Effects 0.000 description 2
- 230000000241 respiratory effect Effects 0.000 description 2
- 206010006458 Bronchitis chronic Diseases 0.000 description 1
- 206010011409 Cross infection Diseases 0.000 description 1
- 206010014561 Emphysema Diseases 0.000 description 1
- 206010029803 Nosocomial infection Diseases 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 208000006673 asthma Diseases 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 206010006451 bronchitis Diseases 0.000 description 1
- 208000007451 chronic bronchitis Diseases 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 208000030603 inherited susceptibility to asthma Diseases 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 210000004072 lung Anatomy 0.000 description 1
- 230000005690 magnetoelectric effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000005622 photoelectricity Effects 0.000 description 1
- 210000002345 respiratory system Anatomy 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 230000002463 transducing effect Effects 0.000 description 1
- 201000008827 tuberculosis Diseases 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
Abstract
The invention discloses a kind of ultrasonic drive circuits, driving method and ultrasonic lung function instrument, wherein driving circuit includes processor, boosting drive module, first transmitting and receiving module, second transmitting and receiving module, signal amplification module and power module for each module for power supply, the processor respectively with boosting drive module, first transmitting and receiving module, second transmitting and receiving module is connected with signal amplification module, the boosting drive module is connect with the first transmitting and receiving module and the second transmitting and receiving module respectively, the signal amplification module is connect with the first transmitting and receiving module and the second transmitting and receiving module respectively.The present invention is driving voltage by the boost in voltage for providing power module, and drives the first transmitting and receiving module and the second transmitting and receiving module to emit ultrasonic wave using driving voltage, greatly reduces the energy consumption of driving circuit；It can reduce battery volume simultaneously, to reduce the volume of equipment, can be widely applied to ultrasonic technology field.
Description
Technical field
The present invention relates to ultrasonic technology field more particularly to a kind of ultrasonic drive circuits, driving method and ultrasonic lung
Function instrument.
Background technique
With economic development, environmental pollution is increasingly severe, causes more and more people with respiratory disease.Lung function
It can check it is one of necessary inspection of respiratory disease, lung functions are measured by lung function instrument, reach detection respiratory system
Abnormal purpose.For early detection lung, respiratory disease, such as chronic bronchitis, pulmonary emphysema, bronchial asthma, intermittence
Tuberculosis etc. has important directive significance.
The core technology of lung function instrument is exactly sensor technology, and emphasis is flow sensor.Major part lung function instrument now
Flow measurement is measured using turbine or differential pressure pickup.Turbine meter, principle be according to rotatable parts (impeller or
Turbine) the velocity of rotation characteristic directly proportional to fluid velocity measure.Air-flow by when push impeller or turbine rotation, leaf
Wheeled to use photoelectricity tune modulation principle, by photoelectric effect, turbine type uses magnetoelectricity modulation principle, by magnetoelectric effect, leaf
The mechanical turn signal of wheel or turbine is converted into electric signal output.Due to the motional inertia and shaft and friction between bearings and journals power of impeller
The factors such as square will affect the precision of sensor.It is relatively accurate that the differential flow sensor linearity cans be compared to, but traditional differential stream
Fast sensor uses metallic sieve, and temperature and pressure is needed to compensate, and it is more to be disturbed factor, needs linearity correction.When flow is big
Pressure difference is also big, and respiratory resistance is also just big, and steam is easy the condensation above so that flow velocity measurement error is caused, to avoid aqueous vapor
Condensation also need heating apparatus, but heating can make gas expansion and measurement error is bigger, and require to dry in the air after cleaning and sterilizing
It could be used after dry.
To solve the above-mentioned problems, it now proposes and is measured using ultrasonic flow transducer.Ultrasonic flow transducer,
Its principle must be propagated by medium using ultrasonic wave, and along the direction of flow, transonic can be accelerated；Against the side of flow
To transonic can slow down.So its time difference is exactly flow.Ultrasonic gas flow measurement technology then has high sensitivity
(also very sensitive to weak gas flow), the linearity is good, and test is accurate, not by the density of exhaled gas, viscosity, humidity and temperature etc.
The influence of parameter, reproducible, stability is good, and calibration-free, respiratory resistance is small, and easy disinfection avoids cross-infection.
But present ultrasonic flow transducer is at work, needs to generate the driving signal of a lasting fixation, this
The working method of sample needs to consume more energy, and such ultrasonic flow transducer needs work in the case where connecting alternating current,
Or need to wear a biggish battery apparatus to ultrasonic flow transducer, it so cannot achieve the portable of ultrasonic lung function instrument
Property.
Summary of the invention
In order to solve the above-mentioned technical problem, the object of the present invention is to provide a kind of more energy-efficient ultrasonic drive circuit,
Driving method and ultrasonic lung function instrument.
First technical solution of the present invention is:
A kind of ultrasonic drive circuit, including processor, boosting drive module, the first transmitting and receiving module, the second transmitting
Receiving module, signal amplification module and the power module for each module for power supply, the processor respectively with boosting drive module,
First transmitting and receiving module, the second transmitting and receiving module are connected with signal amplification module, and the boosting drive module is respectively with
One transmitting and receiving module and the second transmitting and receiving module connection, the signal amplification module respectively with the first transmitting and receiving module and
The connection of second transmitting and receiving module；
The boost in voltage that the boosting drive module is used to provide power module is driving voltage, and uses driving voltage
The first transmitting and receiving module and the second transmitting and receiving module is driven to emit ultrasonic wave.
Further, first transmitting and receiving module includes the first ultrasonic head, first resistor, second resistance, first
NMOS tube and first capacitor；
First ultrasonic head anode respectively with one end of first resistor, one end of second resistance and first capacitor
One end connection, the other end of the first resistor are connected to driving voltage, the other end of the second resistance and the first NMOS tube
Drain electrode connection, the grid of first NMOS tube connect with processor, the other end and signal the amplification mould of the first capacitor
Block connection, the cathode of first ultrasonic head and the source grounding of the first NMOS tube.
It further, further include signal shielding circuit and electronic switch chip, the signal amplification module passes through screened circuit
It is connect with electronic switch chip, the processor is connect with signal shielding circuit and electronic switch chip respectively.
Further, the signal shielding circuit includes 3rd resistor, the 4th resistance, the second NMOS tube, third NMOS tube,
Two capacitors and third capacitor；
One end of the 3rd resistor is connect with the first output end of signal amplification module, the other end of the 3rd resistor
It is connect respectively with the drain electrode of the second NMOS tube and one end of the second capacitor, the other end of second capacitor and electronic switch chip
First input end connection；
One end of 4th resistance is connect with the second output terminal of signal amplification module, the other end of the 4th resistance
It is connect respectively with the drain electrode of third NMOS tube and one end of third capacitor, the other end of the third capacitor and electronic switch chip
The connection of second input terminal；
The processor is connect with the grid of the grid of the second NMOS tube and third NMOS tube respectively, second NMOS tube
Source electrode and third NMOS tube source grounding.
Further, second signal amplification module is additionally provided in the output end of the electronic switch chip.
Further, the boosting drive module include the 5th resistance, the 6th resistance, the 4th capacitor, the 5th capacitor, inductance,
4th NMOS tube, diode and the 6th capacitor；
One end of the inductance is connect with one end of power module, one end of the 4th capacitor and the 5th capacitor respectively, described
The other end of inductance is connect with the anode of the drain electrode of the 4th NMOS tube and diode respectively, and the cathode of the diode passes through the 6th
Capacity earth, and driving voltage is obtained from the cathode of diode, the cathode of the diode passes sequentially through the 5th resistance and the 6th
Resistance eutral grounding, and Voltage Feedback is obtained to processor, the 4th NMOS tube from the tie point of the 5th resistance and the 6th resistance
Grid be connected to processor, the other end of the source electrode of the 4th NMOS tube, the other end of the 4th capacitor and the 5th capacitor is equal
Ground connection.
Second technical solution of the present invention is:
A kind of ultrasonic wave driving method, comprising the following steps:
The boost in voltage that power module is provided is driving voltage；
Driving voltage is used to drive the first transmitting and receiving module and the second transmitting and receiving module hair in turn according to predetermined manner
Ultrasonic signal is penetrated, so that the first transmitting and receiving module and the second transmitting and receiving module mutually receive the ultrasonic wave letter of other side's transmitting
Number；
Electric signal is converted to the ultrasonic signal of acquisition, and is transmitted to processor after amplifying to electric signal.
Further, further comprising the steps of:
Time difference of the ultrasonic wave between the first transmitting and receiving module and the second transmitting and receiving module is calculated according to electric signal；
The flow velocity of gas between the first transmitting and receiving module and the second transmitting and receiving module is calculated according to the time difference.
Third technical solution of the present invention is:
A kind of ultrasound lung function instrument, including gas blow pipe and ultrasonic drive circuit, the ultrasonic drive circuit is using upper
A kind of ultrasonic drive circuit.
It further, further include wireless communication module, the wireless communication module is connect with ultrasonic drive circuit.
The beneficial effects of the present invention are: ultrasonic drive circuit provided by the invention, passes through the electricity for providing power module
Pressure boosting is driving voltage, and drives the first transmitting and receiving module and the second transmitting and receiving module transmitting ultrasound using driving voltage
Wave drives without sampling the driving signal of fixed frequency, greatly reduces the energy consumption of driving circuit, and realization is driven more energy savingly
It is dynamic；It can reduce battery volume simultaneously, to reduce the volume of equipment, make equipment with more portability.
Detailed description of the invention
Fig. 1 is a kind of structural block diagram of ultrasonic drive circuit of the present invention；
Fig. 2 is the electronic circuitry of the first transmitting and receiving module in specific embodiment；
Fig. 3 is the electronic circuitry of screened circuit and electronic switch chip in specific embodiment；
Fig. 4 is the electronic circuitry of boosting drive module in specific embodiment；
Fig. 5 is the electronic circuitry of power module in specific embodiment；
Fig. 6 is a kind of step flow chart of ultrasonic wave driving method of the present invention；
Fig. 7 is the schematic diagram that flow is calculated in specific embodiment.
Specific embodiment
As shown in Figure 1, present embodiments provide a kind of ultrasonic drive circuit, including processor, boosting drive module, the
One transmitting and receiving module, the second transmitting and receiving module, signal amplification module and the power module for each module for power supply, the place
Reason device is connect with boosting drive module, the first transmitting and receiving module, the second transmitting and receiving module and signal amplification module respectively, institute
It states boosting drive module to connect with the first transmitting and receiving module and the second transmitting and receiving module respectively, the signal amplification module point
It is not connect with the first transmitting and receiving module and the second transmitting and receiving module；
The boost in voltage that the boosting drive module is used to provide power module is driving voltage, and uses driving voltage
The first transmitting and receiving module and the second transmitting and receiving module is driven to emit ultrasonic wave.
Current ultrasonic wave driving is that the driving signal for generating a lasting fixation by driving removes driving ultrasonic head,
For example the square wave of 10 200KHz is continuously generated, the waveform of ultrasonic head transmitting fixed frequency, such drive are made by the square wave
Dynamic signal needs to export electric current, it is therefore desirable to consume more energy.And the driving circuit that the present embodiment proposes, then it is to pass through liter
The pressure drive module boost in voltage that provides power module is to driving voltage, specifically, the 5v voltage liter that power module is provided
It is depressed into 208v voltage, which loads on ultrasonic head always, and ultrasonic head loads always one similar to capacitor at this time
Voltage, but energy is not consumed, first transmitting and receiving module and the second transmitting and receiving module are equipped with ultrasonic head, described super
Sonic head can emit ultrasonic wave and receive ultrasonic wave.The energy consumption of driving circuit can be so reduced, and then requires the driving circuit
The battery of wearing is smaller, to reduce the volume of equipment, makes equipment with more portability.
Referring to Fig. 2, it is further used as preferred embodiment, first transmitting and receiving module includes the first ultrasonic head
P1, first resistor R1, second resistance R2, the first NMOS tube Q1 and first capacitor C1；
The first ultrasonic head P1 anode respectively with one end of first resistor R1, one end of second resistance R2 and first
One end of capacitor C1 connects, and the other end of the first resistor R1 is connected to driving voltage, the other end of the second resistance R2
It is connect with the drain electrode of the first NMOS tube Q1, the grid of the first NMOS tube Q1 is connect with processor, the first capacitor C1's
The other end is connect with signal amplification module, the cathode of the first ultrasonic head P1 and the source grounding of the first NMOS tube Q1.
When specific works, the first transmitting and receiving module is mounted on the upstream position that gas flows through, and the second transmitting receives mould
Block is mounted on the downstream position that gas flows through, i.e. gas flow first passes through the first transmitting and receiving module, after by second transmitting connect
Receive module.In the present embodiment, second transmitting and receiving module uses circuit identical with the first transmitting and receiving module
To realize.
Specific working method principle are as follows: when testing the fair current time, i.e. the first transmitting and receiving module transmitting, the second transmitting
Receiving module receives the time between signal.The grid FireUp of first NMOS tube Q1 inputs a high level, the first NMOS
2 foot level of pipe Q1 conducting, the first ultrasonic head P1 (calling upstream ultrasonic wave head in the following text) are pulled to ground by R2, when the first NMOS tube
When the high level of the grid of Q1 becomes low level again, the first NMOS tube Q1 cut-off, 2 foot of upstream ultrasonic wave head is connected to ultrasonic wave by R1
Head driving voltage 208V, ultrasonic head can be generated the ultrasonic wave of corresponding frequency, frequency by the process that low-voltage is connected to high voltage
It is determined according to ultrasonic head self-characteristic, the present embodiment selects the high voltage bearing ultrasonic head of 200KHz.Ultrasonic wave is passed by air
It is multicast to up to downstream ultrasonic wave head, the i.e. ultrasonic head of the second transmitting and receiving module, passes through capacitor (corresponding first transmitting and receiving module
First capacitor C1) signal be given to rear class amplifying circuit after blocking handle.
When testing the adverse current time, i.e. the second transmitting and receiving module transmitting, the first transmitting and receiving module receive signal it
Between time.Similarly, downstream ultrasonic wave head can be generated the ultrasonic wave of corresponding frequency by the process that low-voltage is connected to high voltage, be surpassed
Sound wave reaches upstream ultrasonic wave head (the first ultrasonic head P1) by air borne, and upstream ultrasonic wave head passes through after receiving signal
Signal rear class amplifying circuit is given to after first capacitor C1 blocking to handle.
Traditional driving method is to generate a fixed driving signal, such as the square wave or sine wave of 200KHz go to drive
Dynamic ultrasonic head, the waveform frequency that at this moment ultrasonic head generates is exactly driving frequency, such as 200KHz, but can generate electricity in this way
Stream, the more energy of effect.And in the present embodiment, driving method is that a voltage is persistently loaded to ultrasonic head, passes through control
The unlatching and closure of NMOS tube control the moment on ultrasonic head for voltage pull-down, and such ultrasonic head will own resonance production
The waveform of a raw fixed frequency, that is, launch ultrasonic wave.The electricity of driving consumption can have greatly been saved by this method
Can, thus when equipment specific same cruise duration, the smaller battery of equipped capacitor is but only needed, to reduce the body of equipment
Product.
Specifically, fair current time test and adverse current time test every 2.5ms (or 5ms, time more short precision is higher,
Hardware process speed is required higher) alternately switch, fair current time and adverse current time be can be obtained by into the time as difference after test
Difference, then coefficient will be multiplied by the time difference and flow speed value can be obtained.
Referring to Fig. 3, it is further used as preferred embodiment, further includes signal shielding circuit and electronic switch chip, institute
State signal amplification module and connect with electronic switch chip by screened circuit, the processor respectively with signal shielding circuit and electricity
The connection of sub switch chip.
Referring to Fig. 3, it is further used as preferred embodiment, the signal shielding circuit includes 3rd resistor R3, the 4th
Resistance R4, the second NMOS tube Q2, third NMOS tube Q3, the second capacitor C2 and third capacitor C3；
One end of the 3rd resistor R3 is connect with the first output end of signal amplification module, and the 3rd resistor R3's is another
One end is connect with one end of the second NMOS tube Q2 drain electrode and the second capacitor C2 respectively, the other end and electronics of the second capacitor C2
The first input end of switch chip U1 connects；
One end of the 4th resistance R4 is connect with the second output terminal of signal amplification module, and the 4th resistance R4's is another
One end is connect with one end of third NMOS tube Q3 drain electrode and third capacitor C3 respectively, the other end and electronics of the third capacitor C3
The second input terminal of switch chip U1 connects；
The processor is connect with the grid of the grid of the second NMOS tube Q2 and third NMOS tube Q3 respectively, and described second
The source electrode of NMOS tube Q2 and the source grounding of third NMOS tube Q3.
When the driving of upstream ultrasonic wave head when transmitting ultrasonic wave, the interference signal itself generated can be passed to by first capacitor
In signal amplification module, if do not handled the interference signal, the ultrasonic signal of downstream ultrasonic wave head acquisition can be produced
A raw very strong interference signal, the interference signal can be input to together processing with the ultrasonic signal of downstream ultrasonic wave head acquisition
Device can interfere with collected ultrasonic signal in this way.Therefore the present embodiment carries out interference signal by signal shielding circuit
Shielding, and output signal is selected by electronic switch chip U1, so that interference signal be avoided to interfere with the signal of acquisition.In order to
Interference signal is isolated, the present embodiment is added a NMOS tube and is used for signal shielding, upstream ultrasonic wave head driving test fair current time
When, the grid of the second NMOS tube Q2 inputs a high level, and the second NMOS tube Q2 conducting is grounded, at this moment upstream ultrasonic wave head itself
The interference signal of generation is just shielded, while the GIG_SEL pin of electronic switch chip U1 is set as low level, and at this moment CH0 is logical
Road conducting, the received ultrasonic signal of downstream ultrasonic wave head pass through；The channel CH1 is closed, and the interference signal of upstream ultrasonic wave head is cut
Only.
It can be very good interference-shielded signal by above-mentioned signal shielding circuit and electronic switch chip U1, improve
Anti-interference ability is more conducive to subsequent calculation processing work, improves the quality of equipment.
It is further used as preferred embodiment, is additionally provided with second signal amplification in the output end of the electronic switch chip
Module.
The signal of amplification is transmitted to processor by the second signal amplification module, carries out next step calculation processing.It is described
Second signal amplification module use gain-variable second signal amplifying circuit, signal is carried out after electronic switch second level amplify by
It is weaker in the ultrasonic signal that air blowing flow velocity receives fastlyer, so second amplifying circuit adjustable gain, when the flow velocity detected
Faster, signal amplification factor is bigger, and flow velocity is slower, and amplification factor is smaller.
Upon initialization, the gain of amplifying circuit is slowly adjusted from low to high, and by dwell time, whether moment increases by one
The mode of a wave period detects the value of primary peak and secondary peak, thus after initialization setting one reasonable increase
Beneficial value is that the voltage value of fixed threshold just falls in primary peak and secondary peak middle.
Referring to Fig. 4, it is further used as preferred embodiment, the boosting drive module includes the 5th resistance R5, the 6th
Resistance R6, the 4th capacitor C4, the 5th capacitor C5, inductance L1, the 4th NMOS tube Q4, diode D1 and the 6th capacitor C6；
One end of the inductance L1 connects with one end of power module, one end of the 4th capacitor C4 and the 5th capacitor C5 respectively
It connects, the other end of the inductance L1 is connect with the anode of the drain electrode of the 4th NMOS tube Q4 and diode D1 respectively, the diode
The cathode of D1 is grounded by the 6th capacitor C6, and obtains driving voltage, the cathode of the diode D1 from the cathode of diode D1
The 5th resistance R5 and the 6th resistance R6 ground connection is passed sequentially through, and obtains electricity from the tie point of the 5th resistance R5 and the 6th resistance R6
Pressure feeds back to processor, and the grid of the 4th NMOS tube Q4 is connected to processor, the source electrode of the 4th NMOS tube Q4, the 4th
The other end of the other end of capacitor C4 and the 5th capacitor C5 are grounded.
In the present embodiment, by being 208v voltage by the 5v boost in voltage of power module.The 4th capacitor C4 and the 5th
Capacitor C5 is used to filter the noise in 5v voltage.
Circuit as shown in Figure 5 can be used to realize in the power module.
Embodiment two
As shown in fig. 6, the present embodiment provides a kind of ultrasonic wave driving methods, comprising the following steps:
S1, the boost in voltage for providing power module are driving voltage；
S2, driving voltage is used to drive the first transmitting and receiving module and the second transmitting and receiving module in turn according to predetermined manner
Emit ultrasonic signal, so that the first transmitting and receiving module and the second transmitting and receiving module mutually receive the ultrasonic wave of other side's transmitting
Signal；
S3, electric signal is converted to the ultrasonic signal of acquisition, and be transmitted to processor after amplifying to electric signal.
It is further used as preferred embodiment, further includes step S4~S5:
S4, time of the ultrasonic wave between the first transmitting and receiving module and the second transmitting and receiving module is calculated according to electric signal
Difference；
S5, the flow velocity that gas between the first transmitting and receiving module and the second transmitting and receiving module is calculated according to the time difference.
Explanation is explained in detail to the above method below in conjunction with Fig. 7.
Referring to Fig. 7, ultrasonic wave lung function instrument uses the basic principle of time difference method: when sound wave is propagated in a fluid, fair current side
It will increase to acoustic wave propagation velocity, countercurrent direction can then reduce, and identical propagation distance just has the different propagation times.It utilizes
The difference in propagation time and the relationship of detected fluid flow velocity seek flow velocity, and flow velocity is exactly flow multiplied by pipe section product.
Circular: ultrasonic wave fair current is transmitted to downstream ultrasonic wave transducer from upstream ultrasonic wave transducer, then by
Fluid flow rate is accelerated are as follows:
L/t21=C+v*cos θ (1)
Ultrasonic wave adverse current is transmitted to upstream ultrasonic wave transducer from downstream ultrasonic wave transducer, then is slowed down by fluid flow rate
Are as follows:
L/t12=C-v*cos θ (2)
It is arranged, is obtained by (1)-(2):
V=L/ (2*cos θ) * [(t12-t21)/(t21*t12)] (3)
Because measure obtain it is suitable, reverse on propagation time t12, t21 contain the generation such as circuit, cable and energy converter
Intrinsic electroacoustic be delayed г 12, г 21 must deduct its influence, so formula (3) can rewrite are as follows:
V=L/ (2*cos θ) * { [(t12- г 12)-(t21- г 21)]/[(t21- г 21) * (t12- г 12)] } (4)
Since the circuit of two-way ultrasonic wave is almost the same, г 12=г 21, and the order of magnitude of t12 and t21 is several hundred us, г
The order of magnitude of 12 and г 21 is several ns, so can theoretically ignore the influence of г 12 and г 21.
Since tube wall and internal fluid have friction viscous effect, there is flow velocitys on pipeline section for actual fluid flow rate
Distribution, the flow velocity v for single channel ultrasonic wave flowmeter on centerline, measurement is actually on pipeline section interior diameter
Line average speed, and measuring flow it is desirable that pipeline inner section face mean flow rate vm, they are simultaneously unequal.According to fluid
Theory of mechanics, when Reynolds number is greater than 4000, fluid is in turbulent condition, at this time the pass between line mean flow rate and face mean flow rate
There are a Dynamics Factors K for system, it may be assumed that
Vm=v/K (5)
The diameter of pipeline is D, so as to obtain instantaneous volume flow rate:
Q wink=vm* π * (D/2) 2=v* π * (D/2) 2/K (6)
(3) are substituted into (6)
Q wink=π * (D/2) 2*L* (1/t21-1/t12)/(2*cos θ * K) (7)
Only t21 and t12, which need to be measured, can find out flow Q wink, in continuous measurement, as long as the Q wink that will gradually measure
Value is to time integral, so that it may obtain the integrated flux Q in any time period.
Ultrasonic transducer common are transmitting-receiving integrated, transmitting-receiving integrated and integrated transmitters and receivers transducing
Device not only can be transmitted ultrasonic wave, but also can receive ultrasonic wave, to facilitate the measurement of fair current and adverse current.
It is super that this method drives the first transmitting and receiving module and the second transmitting and receiving module to emit by the variation of high voltage
Acoustic signals, rather than the driving signal fixed to ultrasonic head input, can so reduce the energy consumption of driving circuit, Jin Eryao
The battery for asking the driving circuit to wear is smaller, to reduce the volume of equipment, makes equipment with more portability.
Embodiment three
Present embodiments provide a kind of ultrasonic lung function instrument, including gas blow pipe and ultrasonic drive circuit, the ultrasonic wave
Driving circuit is using a kind of ultrasonic drive circuit described in embodiment one.
The present embodiment and embodiment one have one-to-one relationship, therefore have function corresponding with embodiment one and have
Beneficial effect.
It is further used as preferred embodiment, further includes wireless communication module, the wireless communication module and ultrasonic wave
Driving circuit connection.
Ultrasonic lung function instrument is attached with intelligent terminal by wireless communication module, such user can be by intelligence
The display screen of terminal checks the test result of ultrasonic lung function instrument, without installing display screen on ultrasonic lung function instrument, greatly
Reduce the volume of ultrasonic lung function instrument.
It is to be illustrated to preferable implementation of the invention, but the invention is not limited to the implementation above
Example, those skilled in the art can also make various equivalent variations on the premise of without prejudice to spirit of the invention or replace
It changes, these equivalent deformations or replacement are all included in the scope defined by the claims of the present application.
Claims (10)
1. a kind of ultrasonic drive circuit, which is characterized in that including processor, boosting drive module, the first transmitting and receiving module,
Second transmitting and receiving module, signal amplification module and the power module for each module for power supply, the processor respectively with boosting
Drive module, the first transmitting and receiving module, the second transmitting and receiving module are connected with signal amplification module, the boosting drive module
It is connect respectively with the first transmitting and receiving module and the second transmitting and receiving module, the signal amplification module connects with the first transmitting respectively
Module is received to connect with the second transmitting and receiving module；
The boost in voltage that the boosting drive module is used to provide power module is driving voltage, and is driven using driving voltage
First transmitting and receiving module and the second transmitting and receiving module emit ultrasonic wave.
2. a kind of ultrasonic drive circuit according to claim 1, which is characterized in that the first transmitting and receiving module packet
Include the first ultrasonic head, first resistor, second resistance, the first NMOS tube and first capacitor；
Positive one end with one end of first resistor, one end of second resistance and first capacitor respectively of first ultrasonic head
Connection, the other end of the first resistor are connected to driving voltage, the leakage of the other end of the second resistance and the first NMOS tube
Pole connection, the grid of first NMOS tube are connect with processor, and the other end and signal amplification module of the first capacitor connect
It connects, the cathode of first ultrasonic head and the source grounding of the first NMOS tube.
3. a kind of ultrasonic drive circuit according to claim 1, which is characterized in that further include signal shielding circuit and electricity
Sub switch chip, the signal amplification module are connect by screened circuit with electronic switch chip, the processor respectively with letter
Number screened circuit is connected with electronic switch chip.
4. a kind of ultrasonic drive circuit according to claim 3, which is characterized in that the signal shielding circuit includes the
Three resistance, the 4th resistance, the second NMOS tube, third NMOS tube, the second capacitor and third capacitor；
One end of the 3rd resistor is connect with the first output end of signal amplification module, the other end difference of the 3rd resistor
It is connect with the drain electrode of the second NMOS tube and one end of the second capacitor, the first of the other end of second capacitor and electronic switch chip
Input terminal connection；
One end of 4th resistance is connect with the second output terminal of signal amplification module, the other end difference of the 4th resistance
It is connect with the drain electrode of third NMOS tube and one end of third capacitor, the second of the other end of the third capacitor and electronic switch chip
Input terminal connection；
The processor is connect with the grid of the grid of the second NMOS tube and third NMOS tube respectively, the source of second NMOS tube
The source grounding of pole and third NMOS tube.
5. a kind of ultrasonic drive circuit according to claim 3, which is characterized in that in the defeated of the electronic switch chip
Outlet is additionally provided with second signal amplification module.
6. a kind of ultrasonic drive circuit according to claim 1, which is characterized in that the boosting drive module includes the
Five resistance, the 6th resistance, the 4th capacitor, the 5th capacitor, inductance, the 4th NMOS tube, diode and the 6th capacitor；
One end of the inductance is connect with one end of power module, one end of the 4th capacitor and the 5th capacitor respectively, the inductance
The other end connect respectively with the anode of the drain electrode of the 4th NMOS tube and diode, the cathode of the diode passes through the 6th capacitor
Ground connection, and driving voltage is obtained from the cathode of diode, the cathode of the diode passes sequentially through the 5th resistance and the 6th resistance
Ground connection, and Voltage Feedback is obtained to processor, the grid of the 4th NMOS tube from the tie point of the 5th resistance and the 6th resistance
Pole is connected to processor, and source electrode, the other end of the 4th capacitor and the other end of the 5th capacitor of the 4th NMOS tube are grounded.
7. a kind of ultrasonic wave driving method, which comprises the following steps:
The boost in voltage that power module is provided is driving voltage；
Driving voltage is used to drive the first transmitting and receiving module and the transmitting of the second transmitting and receiving module super in turn according to predetermined manner
Acoustic signals, so that the first transmitting and receiving module and the second transmitting and receiving module mutually receive the ultrasonic signal of other side's transmitting；
Electric signal is converted to the ultrasonic signal of acquisition, and is transmitted to processor after amplifying to electric signal.
8. a kind of ultrasonic wave driving method according to claim 7, which is characterized in that further comprising the steps of:
Time difference of the ultrasonic wave between the first transmitting and receiving module and the second transmitting and receiving module is calculated according to electric signal；
The flow velocity of gas between the first transmitting and receiving module and the second transmitting and receiving module is calculated according to the time difference.
9. a kind of ultrasound lung function instrument, which is characterized in that including gas blow pipe and ultrasonic drive circuit, the ultrasonic wave driving electricity
Road uses a kind of ultrasonic drive circuit described in any one of claims 1-6.
10. a kind of ultrasonic lung function instrument according to claim 9, which is characterized in that it further include wireless communication module, it is described
Wireless communication module is connect with ultrasonic drive circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910423338.0A CN110169786A (en) | 2019-05-21 | 2019-05-21 | A kind of ultrasonic drive circuit, driving method and ultrasonic lung function instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910423338.0A CN110169786A (en) | 2019-05-21 | 2019-05-21 | A kind of ultrasonic drive circuit, driving method and ultrasonic lung function instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110169786A true CN110169786A (en) | 2019-08-27 |
Family
ID=67691612
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910423338.0A Pending CN110169786A (en) | 2019-05-21 | 2019-05-21 | A kind of ultrasonic drive circuit, driving method and ultrasonic lung function instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110169786A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113558659A (en) * | 2021-07-30 | 2021-10-29 | 重庆安酷科技有限公司 | High-precision ultrasonic lung function detector and detection method thereof |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB855650A (en) * | 1958-06-10 | 1960-12-07 | Nat Res Dev | Improvements in or relating to flowmeters |
| US4545244A (en) * | 1979-12-16 | 1985-10-08 | Ebara Corporation | Ultrasonic flow meter |
| JP2004057477A (en) * | 2002-07-29 | 2004-02-26 | Toshiba Corp | Ultrasonic diagnostic instrument |
| JP2008128663A (en) * | 2006-11-16 | 2008-06-05 | Aichi Tokei Denki Co Ltd | Ultrasonic flowmeter |
| JP2010156599A (en) * | 2008-12-26 | 2010-07-15 | Ricoh Elemex Corp | Ultrasonic flowmeter |
| CN103989488A (en) * | 2014-04-09 | 2014-08-20 | 河南迈松医用设备制造有限公司 | Wide-range ultrasonic pulmonary function instrument and calculation method thereof |
| CN108896122A (en) * | 2018-06-25 | 2018-11-27 | 重庆大学 | A kind of high precision ultrasonic flowmeter system and method based on TDC1000 |
| KR20190022055A (en) * | 2017-08-25 | 2019-03-06 | 퉁치 일렉트론(샤먼) 컴퍼니.,리미티드. | A Master-slave Compatible PDC System |
| CN109506727A (en) * | 2018-12-24 | 2019-03-22 | 西安安森智能仪器股份有限公司 | A kind of ultrasonic flow measuring method and low-consumption ultrasonic flow measurement meter |
| CN210990370U (en) * | 2019-05-21 | 2020-07-14 | 广州畅呼医疗器械有限公司 | Ultrasonic drive circuit and ultrasonic lung function instrument |
-
2019
- 2019-05-21 CN CN201910423338.0A patent/CN110169786A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB855650A (en) * | 1958-06-10 | 1960-12-07 | Nat Res Dev | Improvements in or relating to flowmeters |
| US4545244A (en) * | 1979-12-16 | 1985-10-08 | Ebara Corporation | Ultrasonic flow meter |
| JP2004057477A (en) * | 2002-07-29 | 2004-02-26 | Toshiba Corp | Ultrasonic diagnostic instrument |
| JP2008128663A (en) * | 2006-11-16 | 2008-06-05 | Aichi Tokei Denki Co Ltd | Ultrasonic flowmeter |
| JP2010156599A (en) * | 2008-12-26 | 2010-07-15 | Ricoh Elemex Corp | Ultrasonic flowmeter |
| CN103989488A (en) * | 2014-04-09 | 2014-08-20 | 河南迈松医用设备制造有限公司 | Wide-range ultrasonic pulmonary function instrument and calculation method thereof |
| KR20190022055A (en) * | 2017-08-25 | 2019-03-06 | 퉁치 일렉트론(샤먼) 컴퍼니.,리미티드. | A Master-slave Compatible PDC System |
| CN108896122A (en) * | 2018-06-25 | 2018-11-27 | 重庆大学 | A kind of high precision ultrasonic flowmeter system and method based on TDC1000 |
| CN109506727A (en) * | 2018-12-24 | 2019-03-22 | 西安安森智能仪器股份有限公司 | A kind of ultrasonic flow measuring method and low-consumption ultrasonic flow measurement meter |
| CN210990370U (en) * | 2019-05-21 | 2020-07-14 | 广州畅呼医疗器械有限公司 | Ultrasonic drive circuit and ultrasonic lung function instrument |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113558659A (en) * | 2021-07-30 | 2021-10-29 | 重庆安酷科技有限公司 | High-precision ultrasonic lung function detector and detection method thereof |
| CN113558659B (en) * | 2021-07-30 | 2023-07-04 | 重庆安酷科技有限公司 | High-precision ultrasonic lung function detector and detection method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109506727B (en) | Ultrasonic flow measurement method and low-power consumption ultrasonic flowmeter | |
| CN106100770B (en) | A kind of noise coefficient measuring method based on two kinds of detecting ways | |
| CN105890685B (en) | A kind of device for measuring ultrasonic wave flow based on accumulated phase difference | |
| CN106768110A (en) | A kind of inexpensive ultrasonic transducer signal method for fast measuring and circuit | |
| CN108593022A (en) | A kind of Transient Electromagnetic flow transmitter based on differential interference compensation | |
| CN101403635A (en) | Infrasonic wave detection apparatus | |
| CN103454344B (en) | Device and method for simultaneously measuring components and flow of methane | |
| CN113030248A (en) | Hydrogen measurement system and method based on ultrasonic double-frequency phase difference | |
| CN110169786A (en) | A kind of ultrasonic drive circuit, driving method and ultrasonic lung function instrument | |
| CN210990370U (en) | Ultrasonic drive circuit and ultrasonic lung function instrument | |
| CN207336748U (en) | A kind of ultrasonic ranging system | |
| CN104897219A (en) | High-accuracy low-power consumption ultrasonic flowmeter | |
| CN102080976B (en) | Wide-range gas flow detector | |
| CN105865555B (en) | A kind of high temperature resistance analog drive circuit of Coriolis mass flowmeter | |
| CN116990543A (en) | Multichannel ultrasonic speed measuring device and speed measuring method | |
| CN106092274A (en) | A kind of diaphragm gas meter rapid verification method based on auto-correlation algorithm | |
| CN215768390U (en) | Ultrasonic hydrogen concentration sensor | |
| CN206114034U (en) | Low -power consumption gas flow measuring circuit with self -diagnostic function | |
| CN105784036B (en) | A kind of differential type power amplification circuit in Coriolis mass flowmeter drive system | |
| CN103487754A (en) | Wind power generation digital flickermeter for small-scale wind speed environment | |
| CN106404085B (en) | A kind of ultrasonic flowmeter | |
| CN106643930A (en) | Improved ultrasonic flowmeter | |
| CN104568036A (en) | High-precision low-power-consumption ultrasonic flowmeter | |
| CN109323730A (en) | Based on TDC-GP30 double-channel gas ultrasonic flowmeter and application method | |
| JP3584290B2 (en) | Gas concentration measuring device and gas concentration measuring method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |