CN105181045B - Ultrasonic flowmeter, which eliminates temperature, influences the method for the velocity of sound - Google Patents
Ultrasonic flowmeter, which eliminates temperature, influences the method for the velocity of sound Download PDFInfo
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- CN105181045B CN105181045B CN201510268024.XA CN201510268024A CN105181045B CN 105181045 B CN105181045 B CN 105181045B CN 201510268024 A CN201510268024 A CN 201510268024A CN 105181045 B CN105181045 B CN 105181045B
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Abstract
The present invention provides a kind of method that ultrasonic flowmeter eliminates the temperature influence velocity of sound, including：Trigger signal in detection ultrasonic flowmeter in real time, wherein, trigger signal is sent to the drive signal of transmitting transducer for transformer drive circuit；When threshold triggers electric circuit inspection is to trigger signal, driving transmitting transducer sends ultrasonic signal, and to receive the time of trigger signal as the initial point of timing；When reception transducer receives ultrasonic signal, then to receive ultrasonic signal as the cut off of timing；According to the difference of the initial point of timing and the cut off of timing, the time that ultrasonic signal is transmitted in pipeline is shown.By to receive trigger signal as time starting point, avoiding existing ultrasonic flowmeter and beginning to timing when controller sends DA conversion instructions, significantly reduce influence of the temperature to ultrasonic velocity, improve the accuracy of ultrasonic flow rate measurement amount.
Description
Technical field
The present invention relates to ultrasonic flowmeter field, and eliminating temperature more particularly to a kind of Ultrasonic Wave Flowmeter influences
The method of the velocity of sound.
Background technology
One of the main method of time difference method as ultrasonic flow rate measuring, its principle are being flowed by measuring ultrasonic signal
The difference in downstream propagation times and adverse current propagation time calculates flow velocity in body, relative to electromagnetic flowmeter, ultrasonic flow rate measuring
Measurable nonconducting medium, therefore, its application scenario is more extensive.
However, in ultrasonic flow rate measurement amount principle it can be found that the spread speed of ultrasonic wave in a fluid is as
The constant known directly participates in calculating flow rate information, and function of the spread speed of ultrasonic wave in a fluid on temperature and pressure,
With obvious nonlinear characteristic, can change with the change of temperature.Therefore, temperature change is caused by the velocity of sound in fluid
Influence very important, it is necessary to a kind of specifically for ultrasonic flowmeter, can eliminate or be greatly lowered temperature influences the velocity of sound
Method.
The content of the invention
In view of the foregoing deficiencies of prior art, it is an object of the invention to provide a kind of ultrasonic flowmeter to eliminate temperature
The method that degree influences the velocity of sound, for solution, ultrasonic flowmeter is in measurement in the prior art, influence of the temperature factor to the velocity of sound,
Caused by measurement error it is big the problem of.
In order to achieve the above objects and other related objects, the present invention provides a kind of ultrasonic flowmeter and eliminates temperature shadow
The method of sound speed, the ultrasonic flowmeter include transmitting transducer, receive transducer and transmission circuit, the supersonic flow
The method that gauge eliminates the temperature influence velocity of sound includes at least：
The trigger signal in the ultrasonic flowmeter is detected in real time, wherein, the transmission circuit drives including transformer
Circuit and threshold triggers circuit, the trigger signal are sent to the driving of the transmitting transducer for the transformer drive circuit
Signal；
When the threshold triggers electric circuit inspection is to the trigger signal, the transmitting transducer is driven to send ultrasonic wave letter
Number, and to receive the time of the trigger signal as the initial point of timing；
When the reception transducer receives the ultrasonic signal, then to receive the ultrasonic signal in terms of
When cut off；
According to the difference of the initial point of the timing and the cut off of the timing, show that the ultrasonic signal is passed in pipeline
The defeated time.
Preferably, it is described when the threshold triggers electric circuit inspection is to the trigger signal, drive the transmitting transducer
Ultrasonic signal is sent, and to receive the time of the trigger signal as the initial point of timing, is specifically included：
The transmission circuit circuit includes threshold triggers circuit；When the threshold triggers electric circuit inspection is driven to the transformer
During the trigger signal that dynamic circuit is sent, the pumping signal using the trigger signal as the transmitting transducer, with driving
The transmitting transducer sends ultrasonic signal；And the time point to receive the trigger signal is used as transmission ultrasonic signal
Timing initial point.
Preferably, the triggering letter sent when the threshold triggers electric circuit inspection to the transformer drive circuit
Number, specifically include：
The threshold triggers circuit includes voltage comparator, by reference voltage be connected to one of the voltage comparator it is defeated
Enter end, the drive signal that the transformer drive circuit is sent is connected to another input of the voltage comparator
End, when the voltage of the drive signal is more than reference voltage, the voltage comparator exports high level signal, then judges detection
Go out trigger signal in ultrasonic flowmeter.
Preferably, the reference voltage is arranged to 300mv.
Preferably, it is described when the reception transducer receives the ultrasonic signal, then to receive the ultrasound
Cut off of the ripple signal as timing, specifically includes：
Controller is further included in the transmission circuit, will when the reception transducer receives the ultrasonic signal
The time point for receiving the ultrasonic signal is sent to the controller, cut-off of the controller using the time point as timing
Point.
Preferably, the controller is the one or more in DSP, PLC, FPGA.
Preferably, the difference of the initial point according to the timing and the cut off of the timing, shows the ultrasonic wave
The time that signal is transmitted in pipeline, specifically include：
The threshold triggers circuit sends the initial point of timing to the controller, and the transducer that receives is by timing
Cut off is sent to the controller, the controller according to the cut off of the initial point of the timing of reception and the timing it
Difference, calculates the time that the ultrasonic signal is transmitted in pipeline, and shows the time result of calculating.
Preferably, before the trigger signal detected in real time in the ultrasonic flowmeter, further include：
Within the default time, when not detecting the trigger signal in the ultrasonic flowmeter, alarm signal notice is sent
Operator.
Preferably, the default time is one millisecond.
Preferably, it is described do not detect in the ultrasonic flowmeter trigger signal when, send alarm signal notice operation
Person, specifically includes：
In one millisecond, when the voltage of the drive signal is less than the reference voltage of 300mv, the voltage comparator is defeated
Go out low level signal, and send alarm signal, to notify operator.
As described above, the ultrasonic flowmeter of the present invention, which eliminates temperature, influences the method for the velocity of sound, have the advantages that：
By setting threshold triggers circuit between the transformer drive circuit and the transmitting transducer, detection in real time
Whether the drive signal is trigger signal, when the drive signal is trigger signal, not only drives the transmitting transducer
Ultrasonic signal is sent, meanwhile, to detect starting point of the time point as timing of the trigger signal, when the reception transducing
Device is to receive cut off of the time point as timing of ultrasonic signal, starting point and institute of the controller by the timing
The difference between the cut off of timing point is stated, calculates ultrasonic signal transmission time in the pipeline.By to receive
To trigger signal as time starting point, avoid existing ultrasonic flowmeter and begun to when controller sends DA conversion instructions
Timing, significantly reduces influence of the temperature to hardware in ultrasonic flowmeter, improves the accurate of ultrasonic flow rate measurement amount
Degree.
Brief description of the drawings
Fig. 1 is shown as the method flow that a kind of ultrasonic flowmeter provided in an embodiment of the present invention eliminates the temperature influence velocity of sound
Figure；
Fig. 2 is shown as a kind of ultrasonic flowmeter principle framework figure provided in an embodiment of the present invention；
Fig. 3 is shown as the structural frames that a kind of ultrasonic flowmeter provided in an embodiment of the present invention eliminates the temperature influence velocity of sound
Figure.
Component label instructions：
1st, controller, 2, threshold triggers circuit, 3, transformer drive circuit, 4, transmitting transducer, 5, receive transducer, 6,
D/A converter, 7, voltage amplifier circuit.
Embodiment
Illustrate embodiments of the present invention below by way of particular specific embodiment, those skilled in the art can be by this explanation
Content disclosed by book understands other advantages and effect of the present invention easily.The present invention can also be by addition different specific
Embodiment is embodied or practiced, and the various details in this specification can also be based on different viewpoints and application, not carry on the back
Various modifications or alterations are carried out under spirit from the present invention.
Please refer to Fig.1 to Fig.3.It should be noted that the diagram provided in the present embodiment only illustrates this in a schematic way
The basic conception of invention, then only the display component related with the present invention rather than package count during according to actual implementation in schema
Mesh, shape and size are drawn, and kenel, quantity and the ratio of each component can be a kind of random change during its actual implementation, and its
Assembly layout kenel may also be increasingly complex.
As shown in Figure 1, eliminating temperature for a kind of ultrasonic flowmeter provided in an embodiment of the present invention influences the method for the velocity of sound
Flow chart, wherein, the ultrasonic flowmeter includes transmitting transducer 4, receives transducer 5 and transmission circuit, the ultrasonic wave
The method that flowmeter eliminates the temperature influence velocity of sound includes at least：
In step S101, the trigger signal in the ultrasonic flowmeter is detected in real time, wherein, the transmission circuit bag
Transformer drive circuit 3 and threshold triggers circuit 2 are included, the trigger signal is sent to described for the transformer drive circuit 3
The drive signal of transmitting transducer 4；
In the present embodiment, the drive signal is the signal that the transformer drive circuit 3 is sent.
In step s 102, when the threshold triggers circuit 2 detects the trigger signal, the transmitting transducing is driven
Device 4 sends ultrasonic signal, and to receive the time of the trigger signal as the initial point of timing；
Wherein, when the threshold triggers circuit 2 detects the trigger signal of the transmission of transformer drive circuit 3
When, the pumping signal using the trigger signal as the transmitting transducer 4, to drive the transmitting transducer 4 to send ultrasound
Ripple signal；And to receive the time point of the trigger signal as the initial point for the timing for sending ultrasonic signal.
Specifically, the triggering that the transmission of transformer drive circuit 3 is detected when the threshold triggers circuit 2
Signal, specifically includes：
The threshold triggers circuit 2 includes voltage comparator, and reference voltage is connected to one of the voltage comparator
Input terminal, the drive signal that the transformer drive circuit 3 is sent, another for being connected to the voltage comparator are defeated
Enter end, when the voltage of the drive signal is more than reference voltage, the voltage comparator exports high level signal, then judges inspection
Measure trigger signal in ultrasonic flowmeter.
Preferably, the reference voltage is arranged to 300mv, it is of course also possible to according to measurement pipe diameter and measurement of species
Difference, adjusts the scope of the reference voltage.
In step s 103, it is when the reception transducer 5 receives the ultrasonic signal, then described super to receive
Cut off of the acoustic signals as timing；
Wherein, the transmission circuit includes controller 1, when the reception transducer 5 receives the ultrasonic signal,
The time point for receiving the ultrasonic signal is sent to the controller 1, the controller 1 is using the time point as the ultrasound
The cut off for the timing that ripple signal transmits in the duct.
Preferably, the controller 1 is the one or more in DSP, PLC, FPGA.
In the present embodiment, the controller 1 is preferably FPGA, wherein, FPGA selects the EP4E10, DA of ALTERA companies
Select the AD9760 of ADI.
In step S104, according to the difference of the initial point of the timing and the cut off of the timing, the ultrasound is shown
The time that ripple signal is transmitted in pipeline.
Wherein, the threshold triggers circuit 2 sends the initial point of timing to the controller 1, the reception transducer
The cut off of timing is sent to the controller 1, initial point and the timing of the controller 1 according to the timing of reception
The difference of cut off, calculates the time that the ultrasonic signal is transmitted in pipeline, and shows the time result of calculating.
In the present embodiment, the controller 1 is according to the initial point of the timing of reception and the cut off of the timing
Difference be t.
Preferably, before the trigger signal detected in real time in the ultrasonic flowmeter, further include：
Within the default time, when not detecting the trigger signal in the ultrasonic flowmeter, alarm signal notice is sent
Operator.
Preferably, the default time is one millisecond.
Preferably, it is described do not detect in the ultrasonic flowmeter trigger signal when, send alarm signal notice operation
Person, specifically includes：
In one millisecond, when the voltage of the drive signal is less than the reference voltage of 300mv, the voltage comparator is defeated
Go out low level signal, and send alarm signal, to notify operator.
In the present embodiment, if the voltage of the drive signal is less than the reference voltage of 300mv, and at one millisecond
In, voltage comparator output low level signal, sends to controller 1, the controller 1 and receives the low level signal, send out
Go out alarm signal, to notify operator.
Wherein, notifying the mode of operator is included with any one in indicator light, display chart or voice alarm or more
Kind.
As shown in Fig. 2, it is a kind of ultrasonic flowmeter principle framework figure provided in an embodiment of the present invention.In the present embodiment
In, transducer 1 is as ultrasonic pulse signal is sent, and as ultrasonic pulse signal is received, it launches and reception transducer 2
Between time for differing be t1, for transducer 2 as ultrasonic pulse signal is sent, transducer 1, which is used as, receives ultrasonic pulse signal,
It is t that it, which was launched with the time differed between receiving,2, t1With t2Difference be Δ t, itself and fluids within pipes flow velocity relation：
In formula (1), c is the speed of ultrasonic wave in a fluid, and d is pipe diameter, and θ is two ultrasonic transducers and pipeline water
Flat angular separation.By formula (1) as it can be seen that when spread speed is regarded as constant to ultrasonic wave in stationary gas, fluid flow rate with
Time difference, Δ t was directly proportional, and measurement Δ t can obtain flow velocity, so as to calculate the flow velocity of the fluid from pipeline.
Specifically, ultrasonic velocity C is the function on temperature, and influence of the temperature change to ultrasonic velocity C is very big, is led to
Cross along journey and flyback respectively to obtaining formula (2), formula (3)：
Formula (2) and formula (3) are subtracted each other, obtain the formula (4) on flow velocity
C is the speed of ultrasonic wave in a fluid in formula (2), formula (3), formula (4), and d is pipe diameter, and θ is two ultrasonic waves
Can device and pipe level angular separation.
As shown in figure 3, eliminating temperature for a kind of ultrasonic flowmeter provided in an embodiment of the present invention influences the structure of the velocity of sound
Block diagram.
When controller 1 sends DA conversion instructions to D/A converter 6, using the time point as time starting point, when with described
It is timing cut off to receive transducer 5 and receive time of ultrasonic signal, to be received however, there are D/A converter 6 for centre
The controller 1 outwards exports the time delay of analog signal, which is tpda, the reception of voltage amplifier circuit 7 simulation
Signal, the delay which is produced is tpo, transformer drive circuit 3 receives the voltage amplifier circuit
7 amplified analog signal, external output drive signal and long-living delay is tpt, and tptThe overwhelming majority postponed for output,
When the delay for receiving 5 received ultrasonic signal of transducer and producing is tr, the ultrasonic wave letter is being received with the controller 1
Number time point and be t by the difference between a/d converterr, ultrasonic wave is in itself t in the time of pipeline transmission.Therefore, surpass
The overall time that acoustic wave flow meter is shown is t1, represent equation below (5)：
t1=t+tpda+tpo+tpt+tr (5)
In the present embodiment, when the drive signal is trigger signal, the transmitting transducer 4 is not only driven to send super
Acoustic signals, meanwhile, to detect starting point of the time point as timing of the trigger signal, when it is described reception transducer 5 with
Receive ultrasonic signal time point be timing cut off, tpda、tpo、tpt、trIt is various defeated in signals transmission respectively
Go out delay and belong to inherent characteristic, can change with the difference of temperature in transmitting procedure.So as to obtaining ultrasonic flow
Count the overall time t of display1For t and trThe sum of, and threshold triggers circuit 2 postpones very short only picosecond, has little influence on survey
Accuracy of measurement, can be neglected.Eliminate tpda+tpo+tptInfluence to overall time, reduces most delays, so that greatly
Width improves measurement accuracy, eliminates because ultrasonic velocity changes the influence to measured value.
In conclusion the present invention between the transformer drive circuit 3 and the transmitting transducer 4 by setting threshold value
Trigger circuit 2, detects whether the drive signal is trigger signal in real time, when the drive signal is trigger signal, not only
The transmitting transducer 4 is driven to send ultrasonic signal, meanwhile, using time point the opening as timing for detecting the trigger signal
Initial point, when the reception transducer 5 is to receive cut off of the time point as timing of ultrasonic signal, the controller 1 is logical
The difference between the starting point of the timing and the cut off of the timing point is crossed, calculates the ultrasonic signal in the pipeline
Interior transmission time.By to receive trigger signal as time starting point, avoiding existing ultrasonic flowmeter in controller 1
Timing is begun to when sending DA conversion instructions, influence of the temperature to hardware in ultrasonic flowmeter is significantly reduced, improves
The accuracy of ultrasonic flow rate measurement amount.So the present invention effectively overcomes various shortcoming of the prior art and has height and produce
Industry utility value.
The above-described embodiments merely illustrate the principles and effects of the present invention, not for the limitation present invention.It is any ripe
Know the personage of this technology all can carry out modifications and changes under the spirit and scope without prejudice to the present invention to above-described embodiment.Cause
This, those of ordinary skill in the art is complete without departing from disclosed spirit and institute under technological thought such as
Into all equivalent modifications or change, should by the present invention claim be covered.
Claims (8)
1. a kind of ultrasonic flowmeter, which eliminates temperature, influences the method for the velocity of sound, it is characterised in that the ultrasonic flowmeter includes
Transmitting transducer, receive transducer and transmission circuit, and the method that the ultrasonic flowmeter eliminates the temperature influence velocity of sound is at least wrapped
Include：
The trigger signal in the ultrasonic flowmeter is detected in real time, wherein, the transmission circuit includes transformer drive circuit
With threshold triggers circuit, the trigger signal is sent to the driving letter of the transmitting transducer for the transformer drive circuit
Number；
When the threshold triggers electric circuit inspection is to the trigger signal, the transmitting transducer is driven to send ultrasonic signal,
And to receive the time of the trigger signal as the initial point of timing；
Wherein, when the trigger signal that the threshold triggers electric circuit inspection is sent to the transformer drive circuit, by institute
Pumping signal of the trigger signal as the transmitting transducer is stated, to drive the transmitting transducer to send ultrasonic signal；And
To receive the time point of the trigger signal as the initial point for the timing for sending ultrasonic signal；The threshold triggers circuit
Including voltage comparator, reference voltage is connected to an input terminal of the voltage comparator, the transformer is driven into electricity
The drive signal that road is sent is connected to another input terminal of the voltage comparator, when the voltage of the drive signal is big
When reference voltage, the voltage comparator exports high level signal, then judges to detect trigger signal in ultrasonic flowmeter；
When the reception transducer receives the ultrasonic signal, then timing is used as to receive the ultrasonic signal
Cut off；
According to the difference of the initial point of the timing and the cut off of the timing, show what the ultrasonic signal was transmitted in pipeline
Time.
2. ultrasonic flowmeter according to claim 1, which eliminates temperature, influences the method for the velocity of sound, it is characterised in that the base
Quasi- voltage is arranged to 300mv.
3. ultrasonic flowmeter according to claim 1, which eliminates temperature, influences the method for the velocity of sound, it is characterised in that described to work as
When the reception transducer receives the ultrasonic signal, then to receive cut-off of the ultrasonic signal as timing
Point, specifically includes：
Controller is further included in the transmission circuit, when the reception transducer receives the ultrasonic signal, will be received
The time point of the ultrasonic signal is sent to the controller, cut off of the controller using the time point as timing.
4. ultrasonic flowmeter according to claim 3, which eliminates temperature, influences the method for the velocity of sound, it is characterised in that the control
Device processed is the one or more in DSP, PLC, FPGA.
5. ultrasonic flowmeter according to claim 1, which eliminates temperature, influences the method for the velocity of sound, it is characterised in that described
According to the timing initial point and the timing cut off difference, show the time that the ultrasonic signal is transmitted in pipeline,
Specifically include：
The threshold triggers circuit sends the initial point of timing to controller, and the transducer that receives sends out the cut off of timing
Send to the controller, the controller calculates institute according to the difference of the initial point of the timing of reception and the cut off of the timing
The time that ultrasonic signal is transmitted in pipeline is stated, and shows the time result of calculating.
6. ultrasonic flowmeter according to claim 1, which eliminates temperature, influences the method for the velocity of sound, it is characterised in that the reality
When detect trigger signal in the ultrasonic flowmeter before, further include：
Within the default time, when not detecting the trigger signal in the ultrasonic flowmeter, alarm signal notice operation is sent
Person.
7. ultrasonic flowmeter according to claim 6, which eliminates temperature, influences the method for the velocity of sound, it is characterised in that described pre-
If time be one millisecond.
8. ultrasonic flowmeter according to claim 7, which eliminates temperature, influences the method for the velocity of sound, it is characterised in that it is described not
When detecting the trigger signal in the ultrasonic flowmeter, send alarm signal and notify operator, specifically include：
In one millisecond, when the voltage of the drive signal is less than the reference voltage of 300mv, the voltage comparator output is low
Level signal, and alarm signal is sent, to notify operator.
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106706050B (en) * | 2015-08-10 | 2019-03-19 | 杭州思筑智能设备有限公司 | A method of utilizing ultrasonic flow rate measurement amount gas flow |
| CN105628115B (en) * | 2015-12-30 | 2018-11-02 | 浙江大学 | A kind of Impulse Noise Denoising Method applied to transit-time ultrasonic flow meter |
| CN109470890B (en) * | 2018-09-26 | 2020-07-31 | 沈畅 | Dynamic monitoring correction algorithm of ultrasonic instrument |
| CN111024218B (en) * | 2019-12-27 | 2021-11-26 | 中煤科工集团重庆研究院有限公司 | Ultrasonic wave correlation detection method based on automatic tracking |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1169185A (en) * | 1994-10-19 | 1997-12-31 | 松下电器产业株式会社 | Llow rate measurement method and ultrasonic flow meter |
| CN101644776A (en) * | 2009-07-07 | 2010-02-10 | 宁波大学 | Method for obtaining circuit delay time in ultrasonic measuring device |
| CN202066962U (en) * | 2011-05-13 | 2011-12-07 | 五邑大学 | Multifunctional ultrasonic wave measuring instrument |
| CN103630174A (en) * | 2013-12-07 | 2014-03-12 | 重庆前卫科技集团有限公司 | Flow measuring method of ultrasonic flow meter |
| CN103812477A (en) * | 2012-11-12 | 2014-05-21 | 财团法人工业技术研究院 | Ultrasonic wave transmitting circuit and time delay correction method thereof |
| CN104535141A (en) * | 2014-12-23 | 2015-04-22 | 重庆川仪自动化股份有限公司 | Flow speed simulating system and method of ultrasonic flowmeter |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102005051669B3 (en) * | 2005-10-28 | 2007-04-26 | Mib Gmbh Messtechnik Und Industrieberatung | Flow measurement method |
-
2015
- 2015-05-22 CN CN201510268024.XA patent/CN105181045B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1169185A (en) * | 1994-10-19 | 1997-12-31 | 松下电器产业株式会社 | Llow rate measurement method and ultrasonic flow meter |
| CN101644776A (en) * | 2009-07-07 | 2010-02-10 | 宁波大学 | Method for obtaining circuit delay time in ultrasonic measuring device |
| CN202066962U (en) * | 2011-05-13 | 2011-12-07 | 五邑大学 | Multifunctional ultrasonic wave measuring instrument |
| CN103812477A (en) * | 2012-11-12 | 2014-05-21 | 财团法人工业技术研究院 | Ultrasonic wave transmitting circuit and time delay correction method thereof |
| CN103630174A (en) * | 2013-12-07 | 2014-03-12 | 重庆前卫科技集团有限公司 | Flow measuring method of ultrasonic flow meter |
| CN104535141A (en) * | 2014-12-23 | 2015-04-22 | 重庆川仪自动化股份有限公司 | Flow speed simulating system and method of ultrasonic flowmeter |
Non-Patent Citations (1)
| Title |
|---|
| 基于双阈值电平比较法的时差法超声波流量计信号处理研究;闵闿;《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》;20140815(第8期);正文第32-34、36-37、39页，附图3-8、4-1 * |
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