CN104390669B - Effectively improve the positioner and its method of ultrasonic probe received signal strength - Google Patents
Effectively improve the positioner and its method of ultrasonic probe received signal strength Download PDFInfo
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- CN104390669B CN104390669B CN201410653020.9A CN201410653020A CN104390669B CN 104390669 B CN104390669 B CN 104390669B CN 201410653020 A CN201410653020 A CN 201410653020A CN 104390669 B CN104390669 B CN 104390669B
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Abstract
The invention discloses a kind of positioner and its method for effectively improving ultrasonic probe received signal strength.It includes positioner, control system, and positioner includes pipeline, the first ultrasonic probe, the second ultrasonic probe, sliding block, track fixator, stepper motor, rack, gear；Second ultrasonic probe is directly installed on pipeline, first ultrasonic probe is arranged on sliding block, sliding block is arranged on pipeline by track fixator, upper end of slide block has rack, stepper motor is arranged on track fixator, stepper motor is connected by the engagement of wheel and rack with sliding block, and control system is connected with stepper motor, the first ultrasonic probe, the second ultrasonic probe.The present invention is used to solve ultrasonic wave propagation path with ultrasonic probe received signal strength decrease problem caused by rate of flow of fluid change, effectively improves ultrasonic probe received signal strength.
Description
Technical field
The invention belongs to measure, technical field of measurement and test, be related to a kind of ultrasonic probe received signal strength of effectively improving
Positioner and its method.
Background technology
Ultrasonic flowmeter starts largely should with its exclusive advantage as conventional flow metering method in metering field
With, but it also has the shortcomings that poor anti jamming capability, reliability and accuracy class be not high.Using transit time ultrasonic flow meters as
Example, its groundwork be with ultrasonic probe reliably and effectively received ultrasonic signal and accurate Measuring Propagation Time of Ultrasonic Wave,
Wherein the important point make sure that received signal strength, particularly ultrasonic signal fluid media (medium) propagation in decay, by
When rate of flow of fluid distribution interference effect.
It is main in the prior art to be improved by two methods and ensure signal intensity.One kind is to improve ultrasonic probe material
Material and structure are to improve signal conversion efficiency, such as《A kind of flowmeter ultrasonic sensor》(application number：
CN201410037294.5) by adjusting the intensity distribution of piezoelectric element output ultrasonic wave, improve ultrasonic wave and receive sensitivity characteristic
Asymmetry, to improve the signal to noise ratio of ultrasonic signal；Another is by increasing ultrasonic probe drive signal strength
Method realizes, such as《Ultra-large type caliber ultrasonic flowmeter and its signal enhancing method based on TDC-GP22》(application number：
CN201310237599.6)。
As shown in Figure 1 and Figure 2, according to the characteristic of ultrasonic probe, its signal emissive porwer points to angle α's with transmitting
Become big and reduce, it is most strong in the normal direction ultrasonic signal of the ultrasonic wave plane of departure, therefore the ultrasonic wave of different receiving positions
Signal intensity is different；And under the influence of rate of flow of fluid change, ultrasonic wave propagation path can change, therefore ultrasonic probe
Signal most strength real-time change is received, mounted ultrasonic probe does not receive most strong ultrasonic wave letter in many cases
Number.Previously mentioned two methods are in this case without good solution.
Rarely have at present and ultrasonic probe is analyzed and moved by fluid medium and velocity flow profile to signal most strength
Method to improve received signal strength.《A kind of ultrasonic probe automatic positioning method and device based on DSP28335》(Shen
Please number：CN201410056961.4) although the method that it is also proposed by mobile ultrasonic probe to improve measurement accuracy, its
Primarily directed to the determination and installation of ultrasonic probe initial makeup location, do not relate in measurement process because of rate of flow of fluid
The different and method that is adjusted in real time to ultrasonic probe position；Simultaneously because ultrasonic wave concurrent-countercurrent propagation path is in same flow
Otherness under rate of flow of fluid, the method for the patent is it cannot be guaranteed that this is at best measurement position to ultrasonic probe.
The content of the invention
Weaken the invention aims to solve the ultrasonic signal strength because of caused by rate of flow of fluid changes in distribution
There is provided a kind of positioner and its method for effectively improving ultrasonic probe received signal strength for problem.
The purpose of the present invention is reached by following measure.
Effectively improving the positioner of ultrasonic probe received signal strength includes positioner, control system, positioning dress
Put including pipeline, the first ultrasonic probe, the second ultrasonic probe, sliding block, track fixator, stepper motor, rack, gear；
Second ultrasonic probe is directly installed on pipeline, and the first ultrasonic probe is arranged on sliding block, and sliding block passes through rail
Road fixator is fixed on pipeline, and upper end of slide block has rack, and stepper motor is arranged on track fixator, and stepper motor leads to
The engagement for crossing wheel and rack is connected with sliding block, control system and stepper motor, the first ultrasonic probe, the second ultrasonic probe
Connection.
The circuit of described control system is：Core processing unit STM32F103 chip Is/O pins and time-to-digital converter
Device TDC-GP22 7 ends, 8 ends, 9 ends, 10 ends, 11 ends, 12 ends, 13 ends are connected；STM32F103 chip Is/O pins and stepping electricity
Machine driving chip THB7128 2 ends, 3 ends, 16 ends, 17 ends, 18 ends, 19 ends are connected；
Time-to-digit converter TDC-GP22 3 ends, 14 ends, 22 ends, 25 ends, 26 ends, 29 ends are connected with power supply VCC；When
Between digital quantizer TDC-GP22 4 ends, 21 ends, 28 ends, 31 ends be connected to the ground；Time-to-digit converter TDC-GP22 1 end
It is connected with resistance R3, crystal oscillator Y1, electric capacity C3 one end；Time-to-digit converter TDC-GP22 2 ends and electric capacity C4 one end phase
Even, it is connected with resistance R3, crystal oscillator the Y1 other end；The electric capacity C3 other end, C4 other end ground connection；Time-to-digit converter
TDC-GP22 5 ends are connected with resistance R2 one end；Time-to-digit converter TDC-GP22 6 ends and resistance R1 one end phase
Even；Time-to-digit converter TDC-GP22 15 ends are connected with resistance R4, crystal oscillator Y2, electric capacity C6 one end；Time-to-digital converter
Device TDC-GP22 16 ends are connected with electric capacity C5 one end, are connected with resistance R4, crystal oscillator the Y2 other end；Electric capacity C5's is another
End, C6 other end ground connection；Time-to-digit converter TDC-GP22 27 ends are connected with electric capacity C1 one end；Electric capacity C1's is another
End is connected with the resistance R1 other end, one end of the first ultrasonic probe；Time-to-digit converter TDC-GP22 30 ends and electricity
The one end for holding C2 is connected；The electric capacity C2 other end is connected with the resistance R2 other end, one end of the second ultrasonic probe；The first surpass
The other end ground connection of the other end of sonic probe, the second ultrasonic probe；
Stepper motor driver chip THB7128 7 ends, 9 ends, 11 ends, 13 ends are connected with stepper motor；Driving stepper motor
Chip THB7128 14 ends are connected with 12V power supplys；Electric capacity C9, C10 one end are connected with power supply 12V；Electric capacity C9, C10's is another
End ground connection；Stepper motor driver chip THB7128 5 ends are connected with resistance R5, R6 one end；Resistance R5 another termination power
VCC；Resistance R6 other end ground connection；Stepper motor driver chip THB7128 15 termination power VCC；Driving stepper motor core
Piece THB7128 1 end, 6 ends, 10 ends ground connection；An electric capacity C7 termination power VCC；Electric capacity C7 other end ground connection；Stepper motor
Driving chip THB7128 8 ends are connected with resistance R7 one end；Resistance R7 other end ground connection；Stepper motor driver chip
THB7128 12 ends are connected with resistance R8 one end；Resistance R8 other end ground connection；The 4 of stepper motor driver chip THB7128
End is connected with electric capacity C8 one end；Electric capacity C8 other end ground connection.
The step of effectively improving the method for ultrasonic probe received signal strength is as follows：
1) the accurate amendment ultrasonic probe position when rate of flow of fluid is zero, determines the initial bit of the first ultrasonic probe
Put；
2) following current gathered by control system between the ultrasonic probe of last moment first and the second ultrasonic probe is passed
T between sowing time1With adverse current propagation time t2；
3) according between ultrasonic probe apart from L, ultrasonic probe axis and conduit axis angle theta and downstream propagation times
t1With adverse current propagation time t2Calculate the velocity of sound in fluid
Fluid average linear velocity
4) velocity of sound c, the fluid average linear velocity v obtained according to calculating, and caliber D, ultrasonic probe axis and pipeline
Axis angle θ, calculates the offset of the maximum receiving intensity position of ultrasonic signal
5) the offset s analyses obtained by calculating judge that best measurement position B is located at the first ultrasonic probe initial position
Upstream or downstream s at；
6) rotation of control system control stepper motor drives the first ultrasonic probe to be moved to best measurement position B, makes
Ultrasonic probe reception signal is most strong all the time in measurement process.
Described step 1) be：First ultrasonic probe and the second ultrasonic probe are arranged on pipeline, second is kept
Ultrasonic probe is motionless, and continues to launch ultrasonic signal；Control system passes through the first ultrasonic probe of step motor control edge
Pipeline is moved axially, and constantly collection ultrasonic propagation time t；Com-parison and analysis diverse location ultrasonic propagation time t, ultrasonic wave
It is the initial position of the first ultrasonic probe at propagation time t minimums.
Described step 5) be：When the second ultrasonic probe is used for received ultrasonic signal, best measurement position B is located at
At the downstream s of first ultrasonic probe initial position；When the second ultrasonic probe is used to launch ultrasonic signal, optimum measurement
Position B is located at the upstream s of the first ultrasonic probe initial position.
The stepper motor driver chip THB7128 that the present invention is selected has 128 subdivisions, accurately can smoothly control stepping
Motor, and control is simple, stability is strong；Sliding block movement, compact and registration are promoted using the engagement of gear and rack；
The present invention can adjustment ultrasonic probe, to best measurement position, begins in real time according to the change of current fluid velocity flow profile
Ensure that ultrasonic wave reception signal is most strong eventually, effectively improve ultrasonic probe measurement signal intensity, reduce rate of flow of fluid distribution to surveying
The influence of accuracy of measurement.
Brief description of the drawings
Fig. 1 is ultrasonic probe transmission signal intensity and points to angular dependence figure；
Fig. 2 is ultrasonic flowmeter ultrasonic signal transmitting-receiving schematic diagram；
Fig. 3 is the structural representation for the positioner for effectively improving ultrasonic probe received signal strength；
Fig. 4 (a) is the front view of the positioning device structure of the present invention；
Fig. 4 (b) is the side view of the positioning device structure of the present invention；
Fig. 4 (c) is the top view of the positioning device structure of the present invention；
Fig. 5 is the control system circuit figure of the present invention；
Fig. 6 is the signal most strength position view of the embodiment of the present invention 1；
Fig. 7 is the signal most strength position view of the embodiment of the present invention 2.
Embodiment
The invention will be further described with reference to the accompanying drawings and examples.
As shown in figure 3, the positioner for effectively improving ultrasonic probe received signal strength includes positioner, control system
System 9, positioner includes pipeline 1, the first ultrasonic probe 2, the second ultrasonic probe 3, sliding block 4, track fixator 5, stepping
Motor 6, rack 7, gear 8；
Second ultrasonic probe 3 is directly installed on pipeline 1, and the first ultrasonic probe 2 is arranged on sliding block 4, and sliding block 4 leads to
Cross track fixator 5 to be fixed on pipeline 1, there is rack 7 upper end of sliding block 4, stepper motor 6 is arranged on track fixator 5,
Stepper motor 6 is connected by gear 8 with the engagement of rack 7 with sliding block 4, and control system 9 is visited with stepper motor 6, the first ultrasonic wave
First 2, second ultrasonic probe 3 is connected.
The circuit of described control system is：Core processing unit STM32F103 chip Is/O pins and time-to-digital converter
Device TDC-GP22 7 ends, 8 ends, 9 ends, 10 ends, 11 ends, 12 ends, 13 ends are connected；STM32F103 chip Is/O pins and stepping electricity
Machine driving chip THB7128 2 ends, 3 ends, 16 ends, 17 ends, 18 ends, 19 ends are connected；
Time-to-digit converter TDC-GP22 3 ends, 14 ends, 22 ends, 25 ends, 26 ends, 29 ends are connected with power supply VCC；When
Between digital quantizer TDC-GP22 4 ends, 21 ends, 28 ends, 31 ends be connected to the ground；Time-to-digit converter TDC-GP22 1 end
It is connected with resistance R3, crystal oscillator Y1, electric capacity C3 one end；Time-to-digit converter TDC-GP22 2 ends and electric capacity C4 one end phase
Even, it is connected with resistance R3, crystal oscillator the Y1 other end；The electric capacity C3 other end, C4 other end ground connection；Time-to-digit converter
TDC-GP22 5 ends are connected with resistance R2 one end；Time-to-digit converter TDC-GP22 6 ends and resistance R1 one end phase
Even；Time-to-digit converter TDC-GP22 15 ends are connected with resistance R4, crystal oscillator Y2, electric capacity C6 one end；Time-to-digital converter
Device TDC-GP22 16 ends are connected with electric capacity C5 one end, are connected with resistance R4, crystal oscillator the Y2 other end；Electric capacity C5's is another
End, C6 other end ground connection；Time-to-digit converter TDC-GP22 27 ends are connected with electric capacity C1 one end；Electric capacity C1's is another
End is connected with the resistance R1 other end, one end of the first ultrasonic probe 2；Time-to-digit converter TDC-GP22 30 ends and electricity
The one end for holding C2 is connected；The electric capacity C2 other end is connected with the resistance R2 other end, one end of the second ultrasonic probe 3；First
The other end ground connection of the other end of ultrasonic probe 2, the second ultrasonic probe 3；
Stepper motor driver chip THB7128 7 ends, 9 ends, 11 ends, 13 ends are connected with stepper motor；Driving stepper motor
Chip THB7128 14 ends are connected with 12V power supplys；Electric capacity C9, C10 one end are connected with power supply 12V；Electric capacity C9, C10's is another
End ground connection；Stepper motor driver chip THB7128 5 ends are connected with resistance R5, R6 one end；Resistance R5 another termination power
VCC；Resistance R6 other end ground connection；Stepper motor driver chip THB7128 15 termination power VCC；Driving stepper motor core
Piece THB7128 1 end, 6 ends, 10 ends ground connection；An electric capacity C7 termination power VCC；Electric capacity C7 other end ground connection；Stepper motor
Driving chip THB7128 8 ends are connected with resistance R7 one end；Resistance R7 other end ground connection；Stepper motor driver chip
THB7128 12 ends are connected with resistance R8 one end；Resistance R8 other end ground connection；The 4 of stepper motor driver chip THB7128
End is connected with electric capacity C8 one end；Electric capacity C8 other end ground connection.
The core processing unit of control system 9 can use the STM32F103 chips of ST Microelectronics, and the chip is used
ARM 32 Cortex-M3 kernels, maximum operating frequency is 72MHz, needed for disclosure satisfy that apparatus of the present invention；Control system 9
Driving stepper motor module can use the THB7128 drivers of Toshiba, the driver is driven using the bipolar permanent mutually stream of H bridges
Dynamic, maximum supports 128 Multi-level microsteps, can steady accurate Driving Stepping Motor, effectively meet the positioning accuracy request of device.Step
The selection 57BYG stepper motors of stepper motor 6,1.8 ° of step angle, electric current 3A, statical moment 1.8NM disclosure satisfy that apparatus of the present invention
Positioning precision and demanded power output；The time-to-digit converter of control system 9 uses TDC-GP22, the chip highest resolution
Up to 22ps, measurement range can effectively meet ultrasonic flow rate measurement amount demand from 500ns to 4ms.
The step of effectively improving the method for ultrasonic probe received signal strength is as follows：
1) the accurate amendment ultrasonic probe position when rate of flow of fluid is zero, determines the initial bit of the first ultrasonic probe 2
Put；
2) following current between last moment the first ultrasonic probe 2 and the second ultrasonic probe 3 is gathered by control system
Propagation time t1With adverse current propagation time t2；
3) according between ultrasonic probe apart from L, ultrasonic probe axis and conduit axis angle theta and downstream propagation times
t1With adverse current propagation time t2Calculate the velocity of sound in fluid
Fluid average linear velocity
4) velocity of sound c, the fluid average linear velocity v obtained according to calculating, and caliber D, ultrasonic probe axis and pipeline
Axis angle θ, calculates the offset of the maximum receiving intensity position of ultrasonic signal
5) the offset s analyses obtained by calculating judge that best measurement position B is located at the initial position of the first ultrasonic probe 2
Upstream or downstream s at；
6) rotation of the control of control system 9 stepper motor 6 drives the first ultrasonic probe 2 to be moved to best measurement position B,
Make ultrasonic probe reception signal in measurement process most strong all the time.
Described step 1) be：First ultrasonic probe 2 and the second ultrasonic probe 3 are arranged on pipeline 1, the is kept
Two ultrasonic probes 3 are motionless, and continue to launch ultrasonic signal；Control system controls the first ultrasonic wave to visit by stepper motor 6
Head is moved axially along pipeline 1, and constantly collection ultrasonic propagation time t；Com-parison and analysis diverse location ultrasonic propagation time t,
It is the initial position of the first ultrasonic probe 2 at ultrasonic propagation time t minimums.
Described step 5) be：When the second ultrasonic probe 3 is used for received ultrasonic signal, best measurement position B
At the downstream s of the initial position of the first ultrasonic probe 2；When the second ultrasonic probe 3 is used to launch ultrasonic signal, most preferably
Measurement position B is located at the upstream s of the initial position of the first ultrasonic probe 2.
Embodiment 1
Control system 9 completes to propagate the concurrent-countercurrent of the first ultrasonic probe 2, the second ultrasonic probe 3 in last moment
Time measurement, now needs the downstream propagation times t ' to the first ultrasonic probe 2, the subsequent time of the second ultrasonic probe 31Surveyed
Amount.According between ultrasonic probe apart from L, ultrasonic probe axis and conduit axis angle theta and downstream propagation times t1With it is inverse
Flow propagation time t2, following parameter is calculated in control system 9：
The velocity of sound in fluid：
Fluid average linear velocity：
According to velocity of sound c, fluid average line flow velocity v, caliber D, ultrasonic probe axis and conduit axis angle theta, in control
The offset of the maximum receiving intensity position of ultrasonic signal is calculated in system 9：
That is the initial position of ultrasonic probe signal most strength A and the first ultrasonic probe 2 is (ultrasonic when rate of flow of fluid is zero
Ripple probe position) difference offset be s.
That due to measurement is downstream propagation times t '1, the probe for sending ultrasonic signal is the second ultrasonic probe 3.It is right
In the first ultrasonic probe 2, signal most strength A is located at the downstream s of its initial position.It is most strong to make to receive signal, it is optimal to survey
It is signal most strength A to measure position B.Therefore the output control signal of control system 9, first is driven by the rotation of stepper motor 6
Ultrasonic probe 2 is moved at the s of downstream.Downstream propagation times can be carried out after best measurement position B by control system 9 by reaching
t′1Measurement.
Embodiment 2
Control system 9 completes to propagate the concurrent-countercurrent of the first ultrasonic probe 2, the second ultrasonic probe 3 in last moment
Time measurement, now needs the adverse current propagation time t ' to the first ultrasonic probe 2, the second ultrasonic probe 32Measure.According to
Apart from L, ultrasonic probe axis and conduit axis angle theta and downstream propagation times t between ultrasonic probe1When being propagated with adverse current
Between t2, following parameter is calculated in control system 9：
The velocity of sound in fluid：
Fluid average linear velocity：
And then according to velocity of sound c, fluid average line flow velocity v, caliber D, ultrasonic probe axis and conduit axis angle theta, meter
Calculate the offset of the maximum receiving intensity position of ultrasonic signal：
That is ultrasonic probe signal most strength A differs offset with the position of the second ultrasonic probe 3 for s.
That due to measurement is adverse current propagation time t '2, the probe for sending ultrasonic signal is the first ultrasonic probe 2.It is right
In the second ultrasonic probe 3, signal most strength A is located at the downstream s of its initial position.Because the second ultrasonic probe 3 can not
Mobile, to make to receive, signal is most strong, and best measurement position B now is located at the upstream s of the initial position of the second ultrasonic probe 3
Place.Therefore the output control signal of control system 9, drives the first ultrasonic probe 2 to be moved to upstream by the rotation of stepper motor 6
At s.Adverse current propagation time t ' can be carried out after best measurement position B by control system 9 by reaching2Measurement.
Claims (4)
1. a kind of method for effectively improving ultrasonic probe received signal strength, its used device include positioner,
Control system (9), positioner include pipeline (1), the first ultrasonic probe (2), the second ultrasonic probe (3), sliding block (4),
Track fixator (5), stepper motor (6), rack (7), gear (8)；Second ultrasonic probe (3) is directly installed on pipeline (1)
On, the first ultrasonic probe (2) is arranged on sliding block (4), and sliding block (4) is fixed on pipeline (1) by track fixator (5)
On, there is rack (7) sliding block (4) upper end, and stepper motor (6) is arranged on track fixator (5), and stepper motor (6) passes through gear
(8) it is connected with the engagement of rack (7) with sliding block (4), control system (9) and stepper motor (6), the first ultrasonic probe (2), the
Two ultrasonic probes (3) are connected；Characterized in that, it the step of it is as follows：
1) the accurate amendment ultrasonic probe position when rate of flow of fluid is zero, determines the initial position of the first ultrasonic probe (2)；
2) following current between the ultrasonic probe of last moment first (2) and the second ultrasonic probe (3) is gathered by control system
Propagation time t1With adverse current propagation time t2；
3) according between ultrasonic probe apart from L, ultrasonic probe axis and conduit axis angle theta and downstream propagation times t1With
Adverse current propagation time t2Calculate the velocity of sound in fluid
Fluid average linear velocity
4) velocity of sound c, the fluid average linear velocity v obtained according to calculating, and caliber D, ultrasonic probe axis and conduit axis
Angle theta, calculates the offset of the maximum receiving intensity position of ultrasonic signal
5) the offset s analyses obtained by calculating judge that best measurement position B is located at the first ultrasonic probe (2) initial position
At upstream or downstream s；
6) rotation of control system (9) control stepper motor (6) drives the first ultrasonic probe (2) to be moved to best measurement position
B, makes ultrasonic probe reception signal in measurement process most strong all the time.
2. a kind of method for effectively improving ultrasonic probe received signal strength according to claim 1, its feature exists
In described step 1) be：First ultrasonic probe (2) and the second ultrasonic probe (3) are arranged on pipeline (1), kept
Second ultrasonic probe (3) is motionless, and continues to launch ultrasonic signal；Control system the first is surpassed by stepper motor (6) control
Sonic probe is moved axially along pipeline (1), and constantly collection ultrasonic propagation time t；Com-parison and analysis diverse location ultrasonic wave is passed
It is the initial position of the first ultrasonic probe (2) at t between sowing time, ultrasonic propagation time t minimum.
3. a kind of method for effectively improving ultrasonic probe received signal strength according to claim 1, its feature exists
In described step 5) be：When the second ultrasonic probe (3) is used for received ultrasonic signal, best measurement position B is located at the
At the downstream s of one ultrasonic probe (2) initial position；When the second ultrasonic probe (3) is used to launch ultrasonic signal, most preferably
Measurement position B is located at the upstream s of the first ultrasonic probe (2) initial position.
4. a kind of method for effectively improving ultrasonic probe received signal strength according to claim 1, it is characterised in that
The circuit of described control system is：
Core processing unit STM32F103 chip Is/O pins and time-to-digit converter TDC-GP22 7 ends, 8 ends, 9 ends, 10
End, 11 ends, 12 ends, 13 ends are connected；STM32F103 chip Is/O pins and stepper motor driver chip THB7128 2 ends, 3 ends,
16 ends, 17 ends, 18 ends, 19 ends are connected；
Time-to-digit converter TDC-GP22 3 ends, 14 ends, 22 ends, 25 ends, 26 ends, 29 ends are connected with power supply VCC；Time number
Word converter TDC-GP22 4 ends, 21 ends, 28 ends, 31 ends are connected to the ground；Time-to-digit converter TDC-GP22 1 end and electricity
Resistance R3, crystal oscillator Y1, electric capacity C3 one end are connected；Time-to-digit converter TDC-GP22 2 ends are connected with electric capacity C4 one end, with
Resistance R3, the crystal oscillator Y1 other end are connected；The electric capacity C3 other end, C4 other end ground connection；Time-to-digit converter TDC-
GP22 5 ends are connected with resistance R2 one end；Time-to-digit converter TDC-GP22 6 ends are connected with resistance R1 one end；When
Between digital quantizer TDC-GP22 15 ends be connected with resistance R4, crystal oscillator Y2, electric capacity C6 one end；Time-to-digit converter TDC-
GP22 16 ends are connected with electric capacity C5 one end, are connected with resistance R4, crystal oscillator the Y2 other end；The electric capacity C5 other end, C6
The other end is grounded；Time-to-digit converter TDC-GP22 27 ends are connected with electric capacity C1 one end；The electric capacity C1 other end and electricity
The R1 other end, one end of the first ultrasonic probe (2) is hindered to be connected；Time-to-digit converter TDC-GP22 30 ends and electric capacity C2
One end be connected；The electric capacity C2 other end is connected with the resistance R2 other end, one end of the second ultrasonic probe (3)；The first surpass
The other end of sonic probe (2), the other end ground connection of the second ultrasonic probe (3)；
Stepper motor driver chip THB7128 7 ends, 9 ends, 11 ends, 13 ends are connected with stepper motor；Stepper motor driver chip
THB7128 14 ends are connected with 12V power supplys；Electric capacity C9, C10 one end are connected with power supply 12V；Electric capacity C9, C10 another termination
Ground；Stepper motor driver chip THB7128 5 ends are connected with resistance R5, R6 one end；Resistance R5 another termination power VCC；
Resistance R6 other end ground connection；Stepper motor driver chip THB7128 15 termination power VCC；Stepper motor driver chip
THB7128 1 end, 6 ends, 10 ends ground connection；An electric capacity C7 termination power VCC；Electric capacity C7 other end ground connection；Stepper motor drives
Dynamic chip THB7128 8 ends are connected with resistance R7 one end；Resistance R7 other end ground connection；Stepper motor driver chip
THB7128 12 ends are connected with resistance R8 one end；Resistance R8 other end ground connection；The 4 of stepper motor driver chip THB7128
End is connected with electric capacity C8 one end；Electric capacity C8 other end ground connection.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410653020.9A CN104390669B (en) | 2014-11-17 | 2014-11-17 | Effectively improve the positioner and its method of ultrasonic probe received signal strength |
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| CN201410653020.9A CN104390669B (en) | 2014-11-17 | 2014-11-17 | Effectively improve the positioner and its method of ultrasonic probe received signal strength |
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| CN104390669B true CN104390669B (en) | 2017-07-25 |
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| CN106594976B (en) | 2016-11-11 | 2018-12-18 | 青岛海尔空调器有限总公司 | Machine cleaning method inside and outside air-conditioning |
| WO2018223264A1 (en) * | 2017-06-05 | 2018-12-13 | 深圳市建恒测控股份有限公司 | Probe of ultrasonic flowmeter and ultrasonic flowmeter including probe |
| CN107121168B (en) * | 2017-06-05 | 2019-03-12 | 深圳市建恒测控股份有限公司 | A kind of probe of ultrasonic flowmeter and ultrasonic flowmeter comprising the probe |
| CN109341794A (en) * | 2018-12-24 | 2019-02-15 | 南京光声超构材料研究院有限公司 | Ultrasonic flowmeter and the method for adjusting energy converter |
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