CN107941320A - A kind of high-precision acoustic velocity measurement device based on phase difference - Google Patents
A kind of high-precision acoustic velocity measurement device based on phase difference Download PDFInfo
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- CN107941320A CN107941320A CN201711423089.2A CN201711423089A CN107941320A CN 107941320 A CN107941320 A CN 107941320A CN 201711423089 A CN201711423089 A CN 201711423089A CN 107941320 A CN107941320 A CN 107941320A
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- transducer
- phase difference
- acoustic velocity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H5/00—Measuring propagation velocity of ultrasonic, sonic or infrasonic waves, e.g. of pressure waves
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- General Physics & Mathematics (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
A kind of high-precision acoustic velocity measurement device based on phase difference, it includes signal projector, the signal output part of signal projector and the input terminal of transmitting transducer connect, output terminal of the input terminal of phase difference measurement module respectively with transmitting transducer, reception transducer is connected, the output terminal of phase difference measurement module is connected with processor, the output terminal of processor is connected with display module, transmitting transducer is arranged on stent with receiving transducer, and the transmitting terminal of transmitting transducer is oppositely arranged with receiving the receiving terminal of transducer.It relies primarily on oscillograph to observe transmitting signal and receive signal primarily to solving existing acoustic velocity measutement, is very easy to there are human error, and unavoidable technical problem.
Description
Technical field
The present invention relates to acoustic velocity measutement technical field, and in particular to a kind of high-precision acoustic velocity measutement dress based on phase difference
Put.
Background technology
The velocity of sound is the important basic parameter of acoustic investigation, by acoustic velocity measutement, can measure the shear mould of material indirectly
The parameters such as amount, elasticity modulus and density, acoustic velocity measutement is widely used in the fields such as Non-Destructive Testing, in the industrial production with one
Fixed Practical significance.
The measurement of the velocity of sound is the important content of Experiment of College Physics, and common method has：Resonance method, phase method and time difference method.
The lissajous figures that the conventional phase difference method survey velocity of sound is synthesized using oscillograph observation transmitted wave with reception signal vertical vibration are come really
Phase bit is poor.And it is easy to human error occur when observing lissajous figures using oscillograph, and can not avoid.
The content of the invention
The object of the present invention is to provide a kind of high-precision acoustic velocity measurement device based on phase difference, it is primarily to solve
Existing acoustic velocity measutement relies primarily on oscillograph to observe transmitting signal and receive signal, is very easy to there are human error, and
Unavoidable technical problem.
In order to realize above-mentioned technical characteristic, the technical solution adopted by the present invention is：
A kind of high-precision acoustic velocity measurement device based on phase difference, it includes signal projector, the signal of signal projector
The input terminal of output terminal and transmitting transducer connects, and the input terminal of phase difference measurement module is changed with transmitting transducer, reception respectively
The output terminal connection of energy device, the output terminal of phase difference measurement module are connected with processor, the output terminal and display module of processor
Connection, transmitting transducer are arranged on stent with receiving transducer, and the transmitting terminal of transmitting transducer is with receiving connecing for transducer
Receiving end is oppositely arranged.
Above-mentioned transmitting transducer can make close, remote movement with receiving transducer on same branch line.
Above-mentioned stent includes measuring scale, and transmitting transducer or reception transducer are flexibly connected with measuring scale.
Above-mentioned measuring scale is equipped with sliding equipment, and transmitting transducer or reception transducer are connected with sliding equipment.
Above-mentioned sliding equipment includes sliding slot connector or pulley connector.
Above-mentioned measuring scale is vernier caliper.
The output terminal of above-mentioned reception transducer is connected by amplifier with phase difference measurement module.
The input terminal of above-mentioned processor is connected with temperature collecting module respectively.
When carrying out acoustic velocity measutement, using following steps：
1) by measuring the spacing obtained between transmitting transducer and reception transducer；
2) phase difference measurement module measurement transmitting transducer input terminal, the phase difference of reception transducer output end signal, lead to
Cross display module and show phase difference, and record；
3) adjust and increase transmitting transducer, the spacing between reception transducer, occur the phase in step 2) for the second time
When poor, measurement obtains transmitting transducer and receives the spacing between transducer；
4) difference of the spacing of measurement and the spacing of measurement in step 1) in step 3) is recorded；
5) by the calculation formula of acoustic velocity measutement, the velocity of sound is calculated.
Above-mentioned velocity of sound calculation formula is v=f λ, wherein velocity of sound v, unit m/s；Frequency f, unit Hz；Wavelength X, unit m.
The present invention has the following technical effect that：
Using the above structure, compared with the prior art, the present invention passes through measuring scale, transmitting transducer, reception transducer, place
Device, the coordinated of display are managed, can realize the measurement of signal phase difference, signal wavelength well, so that easy, accurate
To the velocity of sound, eliminate and the relevant tedious steps of acoustic velocity measutement are carried out by observation oscilloscope.
Brief description of the drawings
The invention will be further described with reference to the accompanying drawings and examples.
Fig. 1 is the system framework schematic diagram of the present invention；
Fig. 2 is apparatus of the present invention part-structure schematic diagram；
Fig. 3 is phase difference measuring circuit wiring diagram；
Fig. 4 is phase difference measurement chip output voltage schematic diagram；
Fig. 5 is amplifying circuit schematic diagram；
Fig. 6 is temperature sensor circuit figure.
Embodiment
As shown in Figure 1, a kind of high-precision acoustic velocity measurement device based on phase difference, it includes signal projector 1, signal hair
The signal output part of emitter 1 is connected with the input terminal of transmitting transducer 2, the input terminal of phase difference measurement module 3 respectively with transmitting
Transducer 2, the output terminal connection for receiving transducer 4, the output terminal of phase difference measurement module 3 are connected with processor 5, processor 5
Output terminal be connected with display module 10, transmitting transducer 2 with receive transducer 4 be respectively provided with the frame 6, transmitting transducer 2
Transmitting terminal and receive transducer 4 receiving terminal be oppositely arranged.
The transmitting transducer 2 can make close, remote movement with receiving transducer 4 on same branch line, very convenient
Make transmitting transducer and receive transducer and perform relative motion, then coordinate other modules in Fig. 1 well, carry out wavelength
Measurement.
The stent 6 includes measuring scale 7, and transmitting transducer 2 or reception transducer 4 are flexibly connected with measuring scale 7, measuring scale
It is installed on transmitting transducer and receives above transducer, is convenient for measuring both spacing.
The measuring scale 7 is equipped with sliding equipment 11, and transmitting transducer 2 or reception transducer 4 are connected with sliding equipment.
The sliding equipment includes sliding slot connector or pulley connector.
The measuring scale 7 is vernier caliper.
The output terminal for receiving transducer 4 is connected by amplifier 8 with phase difference measurement module 3, and amplifying circuit will connect
Receive transducer and receive weak signal progress reversely amplification twice, facilitate phase measurement chip to identify.
Wherein, temperature has a great influence the velocity of sound, therefore temperature collecting module provides current temperature information, improves the section of measurement
The property learned.
The input terminal of the processor 5 is connected with phase difference measurement module 3, temperature collecting module 9 respectively.
When carrying out acoustic velocity measutement, using following steps：
1) by measuring the spacing obtained between transmitting transducer 2 and reception transducer 4；
2) phase difference measurement module 3 measures 2 input terminal of transmitting transducer, receives the phase difference of 4 output end signal of transducer,
Phase difference is shown by display module 10, and is recorded；
3) adjust and increase transmitting transducer 2, the spacing between reception transducer 4, occur the phase in step 2) for the second time
During potential difference, measurement obtains transmitting transducer 2 and receives the spacing between transducer 4；
4) difference of the spacing of measurement and the spacing of measurement in step 1) in step 3) is recorded；
5) by the calculation formula of acoustic velocity measutement, the velocity of sound is calculated.
Using above-mentioned steps, lissajous figures are observed compared to conventional measurement velocity of sound oscillograph, the present invention only need to be by changing
Become transmitting transducer and receive spacing and the measurement of transducer, then compared, calculated by simple phase difference, you can complete to survey
Amount, it is easy to operate, it is not likely to produce human error.
The velocity of sound calculation formula is v=f λ, wherein velocity of sound v, unit m/s；Frequency f, unit Hz；Wavelength X, unit m.
Specifically, as shown in Figure 1, the pumping signal of signal generator generation specific frequency, is respectively fed to phase-detection mould
Signal is amplified and launched by block and transmitting transducer, transmitting transducer, and signal after the propagation of certain distance, change by reception
Energy device receives this signal, and by after this signal feeding amplifying circuit, is transferred to phase detecting module.Due to two time of arrival (toa)
Different (there are wave path-difference) and produce phase difference.
As shown in Fig. 2, transmitting transducer and reception transducer are rack-mount, frame upper is equipped with vernier caliper, leads to
The position moved and receive transducer is crossed, changes both distances.
As shown in figure 3, phase difference measurement module is made of AD8302 phase difference measurements chip and associated satellite circuit, when connecing
When receiving two signals, the voltage signal being inversely proportional with two signal phase differences can be exported, it is 0 ° that it, which measures phase difference measurement scope,
~180 °, corresponding output voltage range is 0~1.8V, and measurement error is less than 0.5 °.
As shown in figure 4, during AD8302 phase difference measurement chip operations, when phase difference is 0 °, output voltage 1.8V, when
When phase difference is 180 °, output voltage 0V, but output voltage cannot be distinguished by the positive and negative of phase difference.
As shown in figure 5, the two-stage amplifying circuit that amplification circuit module is made of the double operation amplifier chips of two panels LF353, right
Receiving the weak signal received by transducer S2 is strengthened, and the signal of enhancing is sent into phase measurement module.
As shown in fig. 6, temperature sensor DS18B20 is the temperature sensor for supporting " one-wire bus " interface, one is connected
Pull-up resistor, provides enough electric currents when being operated for temperature transition, and can transmit temperature information to microprocessor controller in real time.
The calculation formula of acoustic velocity measutement：
V=f λ, wherein velocity of sound v, unit m/s；Frequency f, unit Hz；Wavelength X, unit m, during acoustic velocity measutement, signal
Sent by signal generator, therefore frequency is it is known that only need measurement wavelength.
Wavelength refers to the distance that ripple is propagated within a vibration period, and after ripple is transmitting a cycle, its phase difference is
360°。
It is mobile to receive transducer during acoustic velocity measutement, read by vernier caliper between transmitting transducer and reception transducer
Away from for L1, microprocessor controller shows phase difference at this time and temperature information by LCD1602 in real time, manually remembers
Record the phase differenceThen it is constantly mobile to receive transducer 4, increase transmitting transducer 2 and receive 4 distance of transducer, when first
Secondary there is phase difference and beWhen, since AD8302 phase difference measurements chip can only realize 0 °~180 ° measurements, and it cannot distinguish between phase
Position is advanced or lags, therefore until phase difference is for the second timeWhen, the distance L of measurement transmitting transducer 2 and reception transducer 42,
Then wavelength X=L of the signal wave2-L1。
By simply calculating the velocity of sound that can be measured under Current Temperatures.
Claims (10)
- A kind of 1. high-precision acoustic velocity measurement device based on phase difference, it is characterised in that：It includes signal projector (1), signal The signal output part of transmitter (1) is connected with the input terminal of transmitting transducer (2), the input terminal point of phase difference measurement module (3) Output terminal not with transmitting transducer (2), reception transducer (4) is connected, the output terminal and processor of phase difference measurement module (3) (5) connect, the output terminal of processor (5) is connected with display module (10), and transmitting transducer (2) is all provided with receiving transducer (4) Put on stent (6), the transmitting terminal of transmitting transducer (2) is oppositely arranged with receiving the receiving terminal of transducer (4).
- A kind of 2. high-precision acoustic velocity measurement device based on phase difference according to claim 1, it is characterised in that：The hair Close, remote movement can be made with receiving transducer (4) on same branch line by penetrating transducer (2).
- A kind of 3. high-precision acoustic velocity measurement device based on phase difference according to claim 1 or 2, it is characterised in that：Institute Stating stent (6) includes measuring scale (7), and transmitting transducer (2) or reception transducer (4) are flexibly connected with measuring scale (7).
- A kind of 4. high-precision acoustic velocity measurement device based on phase difference according to claim 3, it is characterised in that：The survey Gage (7) is equipped with sliding equipment (11), and transmitting transducer (2) or reception transducer (4) are connected with sliding equipment.
- 5. according to a kind of one of them described high-precision acoustic velocity measurement device based on phase difference of claim 4, its feature exists In：The sliding equipment includes sliding slot connector or pulley connector.
- A kind of 6. high-precision acoustic velocity measurement device based on phase difference according to claim 3, it is characterised in that：The survey Gage (7) is vernier caliper.
- A kind of 7. high-precision acoustic velocity measurement device based on phase difference according to claim 1, it is characterised in that：It is described to connect The output terminal for receiving transducer (4) is connected by amplifier (8) with phase difference measurement module (3).
- A kind of 8. high-precision acoustic velocity measurement device based on phase difference according to claim 1 or 7, it is characterised in that：Institute The input terminal for stating processor (5) is connected with phase difference measurement module (3), temperature collecting module (9) respectively.
- 9. a kind of high-precision acoustic velocity measurement device based on phase difference according to claim 1 or 2 or 4 or 5 or 6 or 7, its It is characterized in that, when carrying out acoustic velocity measutement, using following steps：1) by measuring the spacing obtained between transmitting transducer (2) and reception transducer (4)；2) phase difference measurement module (3) measurement transmitting transducer (2) input terminal, the phase of reception transducer (4) output end signal Difference, phase difference is shown by display module (10), and is recorded；3) adjust and increase transmitting transducer (2), the spacing between reception transducer (4), occur the phase in step 2) for the second time During potential difference, measurement obtains transmitting transducer (2) and receives the spacing between transducer (4)；4) difference of the spacing of measurement and the spacing of measurement in step 1) in step 3) is recorded；5) by the calculation formula of acoustic velocity measutement, the velocity of sound is calculated.
- 10. a kind of high-precision acoustic velocity measurement device based on phase difference according to claim 9, it is characterised in that described Velocity of sound calculation formula is v=f λ, wherein velocity of sound v, unit m/s；Frequency f, unit Hz；Wavelength X, unit m.
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| CN201711423089.2A CN107941320A (en) | 2017-12-25 | 2017-12-25 | A kind of high-precision acoustic velocity measurement device based on phase difference |
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| CN201711423089.2A CN107941320A (en) | 2017-12-25 | 2017-12-25 | A kind of high-precision acoustic velocity measurement device based on phase difference |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114877983A (en) * | 2022-05-27 | 2022-08-09 | 哈尔滨工程大学 | Highly integrated sound velocity measuring instrument and measuring method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2476802Y (en) * | 2001-04-20 | 2002-02-13 | 杨吉生 | Sound velocimeter |
| CN102589674A (en) * | 2012-03-13 | 2012-07-18 | 无锡科技职业学院 | Experimental device for measuring sound velocity |
| CN104949751A (en) * | 2015-06-17 | 2015-09-30 | 江苏大学 | Intelligent acoustic velocity measurement experimental device and acoustic velocity measurement method |
| CN105157810A (en) * | 2015-05-12 | 2015-12-16 | 南阳理工学院 | Fully automatic sound velocity measuring instrument and measurement method |
-
2017
- 2017-12-25 CN CN201711423089.2A patent/CN107941320A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2476802Y (en) * | 2001-04-20 | 2002-02-13 | 杨吉生 | Sound velocimeter |
| CN102589674A (en) * | 2012-03-13 | 2012-07-18 | 无锡科技职业学院 | Experimental device for measuring sound velocity |
| CN105157810A (en) * | 2015-05-12 | 2015-12-16 | 南阳理工学院 | Fully automatic sound velocity measuring instrument and measurement method |
| CN104949751A (en) * | 2015-06-17 | 2015-09-30 | 江苏大学 | Intelligent acoustic velocity measurement experimental device and acoustic velocity measurement method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114877983A (en) * | 2022-05-27 | 2022-08-09 | 哈尔滨工程大学 | Highly integrated sound velocity measuring instrument and measuring method |
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Application publication date: 20180420 |