CN108181381A - Contactless solid material longitudinal wave velocity measuring device and sonic velocity measurement method - Google Patents
Contactless solid material longitudinal wave velocity measuring device and sonic velocity measurement method Download PDFInfo
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- CN108181381A CN108181381A CN201611121934.6A CN201611121934A CN108181381A CN 108181381 A CN108181381 A CN 108181381A CN 201611121934 A CN201611121934 A CN 201611121934A CN 108181381 A CN108181381 A CN 108181381A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/07—Analysing solids by measuring propagation velocity or propagation time of acoustic waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/01—Indexing codes associated with the measuring variable
- G01N2291/011—Velocity or travel time
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/04—Wave modes and trajectories
- G01N2291/042—Wave modes
- G01N2291/0421—Longitudinal waves
Abstract
The contactless solid material longitudinal wave velocity measuring device of the present invention has：Liquid tank is placed with measured object and filled with the liquid for not destroying measured object characteristic；A series of sound wave in the side of the liquid tank, sending out different frequencies is configured in transmitting transducer；Energy converter is received, is configured in the opposite side in the side with being configured with the transmitting transducer of the liquid tank, receives the sound wave through the measured object；Signal acquisition process device, the waveform of sound wave received to the reception energy converter handle, obtain a series of respective transmission potentials of different frequency transmitted acoustic pulse, the longitudinal wave velocity of the measured object is obtained according to corresponding frequency of sound wave during transmission potential highest.According to the present invention, unsuitable contact material cannot be measured, dredge soft material, the deficiency compared with the materials longitudinal wave velocity such as thin material by overcoming contact acoustic velocity measurement device in the prior art, it does not need to probe in the present invention to contact with measured object, it will be able to obtain accurate measured object longitudinal wave velocity.
Description
Technical field
The present invention relates to a kind of contact solid materials that do not need to just can accurately measure the contactless solid of its longitudinal wave velocity
Body material longitudinal wave velocity measuring device and sonic velocity measurement method.
Background technology
At present, the longitudinal wave velocity measurement of well known solid material is directly to be in close contact by longitudinal wave probe with measured object, quilt
The time required to the length or thickness divided by longitudinal wave of survey object are by this length or thickness（The hereinafter referred to as time difference）The as measured object
Longitudinal wave velocity.But some characteristics of many solid materials in itself to be not suitable for being in direct contact with probe：Such as certain corrosion
Property stronger material can to probe cause irreversible damage；Measured object needs to be in close contact with probe, this needs certain fastening
Compaction measure, and certain solid material elasticity are larger, occur to make result very inaccurate compared with large deformation when compressing；Certain solids
Material surface is coarse, internal defect（Such as the rock core particularly loose core in acoustic logging field）It is not suitable for pressurization fastening.Meanwhile
Contact method, which measures longitudinal wave velocity, has material thickness certain requirement, because the acquisition of interval transit time is very tired when material is too thin
Difficulty, the requirement to probe are very high.
Invention content
In order to overcome existing contact acoustic velocity measurement device that cannot measure unsuitable contact material, thin soft material, compared with thin material
The deficiency of materials longitudinal wave velocity is waited, the present invention provides a kind of longitudinal wave velocity measuring device and sonic velocity measurement method, measurement dress
It puts not needing to pop one's head in and be contacted with measured object, it will be able to obtain accurate measured object longitudinal wave velocity.
The present invention provides a kind of contactless solid material longitudinal wave velocity measuring device, which is characterized in that has：
Liquid tank places measured object and filled with the liquid for the characteristic for not destroying the measured object wherein；
Transmitting transducer is configured in the side of the liquid tank, and sends out a series of sound wave of different frequencies；
Energy converter is received, is configured in the opposite side in the side with being configured with the transmitting transducer of the liquid tank, receives
Through the sound wave of the measured object；And
Signal acquisition process device, the waveform of sound wave received to the reception energy converter are handled, and obtain a series of differences
The respective transmission potential of frequency transmitted acoustic pulse obtains the vertical of the measured object according to corresponding frequency of sound wave during transmission potential highest
Wave sound speed.
In addition, in the contactless solid material longitudinal wave velocity measuring device of the present invention, according to by the signal acquisition
A series of transmission potential of different frequency transmitted acoustic pulses that processing unit obtains, obtains sound intensity transmission system corresponding with each frequency
Number establishes the mapping table of the sound intensity transmission coefficient and each frequency, is tested according to the sound intensity transmission coefficient with described
The relationship of the thickness of object and the mapping table obtain the longitudinal wave velocity of the measured object.
In addition, in the contactless solid material longitudinal wave velocity measuring device of the present invention,
Using the liquid between the transmitting transducer and the measured object in the liquid tank as the 1st layer of medium, incite somebody to action
The measured object is as the 2nd layer of medium and using the measured object and the liquid received between energy converter as the 3rd layer of Jie
Matter, if the density of n-th layer medium, acoustic speed are respectively ρn、vn, acoustic impedance Zn=ρn×vn, the thickness of the 2nd layer of medium
It spends for d, wherein, n=1,2,3,
If frequency of sound wave is f, then angular frequency is ω=2 π f, the wave number k of n-th layer mediumnSuch as formula（1）It is shown,
(1),
The wavelength X of sound wave in n-th layer mediumnSuch as formula（2）It is shown,
(2),
The sound intensity transmission coefficient T of the 1st, 2,3 layer of this three layers of media is obtained as a result,I, TISuch as formula（3）It is shown,
(3),
Work as Z1=Z3When, it is half-wavelength in the 2nd layer of medium in the thickness d of the 2nd layer of mediumIntegral multiple in the case of
The sound intensity transmission coefficient is maximum, that is, whenShi Suoshu sound intensity transmission coefficients are maximum, wherein, m is greater than
Positive integer equal to 1, according to above-mentioned formula（2）It can obtain speed of the sound wave in the 2nd layer of medium, whereinFor corresponding frequency of sound wave during m-th of maximum of sound intensity transmission coefficient described in the mapping table（Except 0Hz）.
In addition, in the contactless solid material longitudinal wave velocity measuring device of the present invention, it is 1 to take m values, and by described in
Frequency during the 1st in addition to 0Hz sound intensity transmission coefficient peak value in mapping table is brought into formulaIn, from
And obtain the longitudinal wave velocity of the measured object.
In addition, in the contactless solid material longitudinal wave velocity measuring device of the present invention, the measured object is changed with described
The direction of the launch of energy device and the reception direction for receiving energy converter are vertical.
In addition, in the contactless solid material longitudinal wave velocity measuring device of the present invention, it is also equipped with：Signal generator,
It is connect with the transmitting transducer, exports a series of signal of frequency from low to high at equal intervals in the form of frequency sweep to drive and institute
State a series of sound wave that transmitting transducer sends out different frequencies.
In addition, the present invention provides a kind of sonic velocity measurement method, solid material longitudinal wave velocity is surveyed in a non contact fashion
Amount, which is characterized in that have following steps：
Transmitting transducer sends out a series of sound wave of different frequencies；
Receive the sound wave that energy converter receives from the transmitting transducer and penetrated measured object；And
The waveform of sound wave received to the reception energy converter is handled, and obtains a series of different frequency transmitted acoustic pulses respectively
Transmission potential, the longitudinal wave velocity of the measured object is obtained according to corresponding frequency of sound wave during transmission potential highest.
In addition, in the sonic velocity measurement method of the present invention, in the step of obtaining the longitudinal wave velocity of the measured object, according to institute
A series of obtained transmission potential of different frequency transmitted acoustic pulses, obtains sound intensity transmission coefficient corresponding with each frequency, establishes institute
The mapping table of sound intensity transmission coefficient and each frequency is stated, according to the thickness of the sound intensity transmission coefficient and the measured object
Relationship and the mapping table obtain the longitudinal wave velocity of the measured object.
In addition, in the sonic velocity measurement method of the present invention,
It, will be between the transmitting transducer and the measured object in the step of obtaining the longitudinal wave velocity of the measured object
Liquid as the 1st layer of medium, using the measured object as the 2nd layer of medium and by the measured object with it is described reception energy converter it
Between liquid as the 3rd layer of medium, if the density of n-th layer medium, acoustic speed are respectively ρn、vn, acoustic impedance Zn=ρn×
vn, the thickness of the 2nd layer of medium is d, wherein, n=1,2,3,
If frequency of sound wave is f, then angular frequency is ω=2 π f, the wave number k of n-th layer mediumnSuch as formula（1）It is shown,
(1),
The wavelength X of sound wave in n-th layer mediumnSuch as formula（2）It is shown,
(2),
The sound intensity transmission coefficient T of the 1st, 2,3 layer of this three layers of media is obtained as a result,I, TISuch as formula（3）It is shown,
(3),
Work as Z1=Z3When, it is half-wavelength in the 2nd layer of medium in the thickness d of the 2nd layer of mediumIntegral multiple in the case of
The sound intensity transmission coefficient be maximum, that is, when d=m ×Shi Suoshu sound intensity transmission coefficients are maximum, wherein, m is greater than
Positive integer equal to 1, according to above-mentioned formula（2）It can obtain speed of the sound wave in the 2nd layer of medium,
InFor corresponding frequency of sound wave during m-th of maximum of sound intensity transmission coefficient described in the mapping table（0Hz is removed
Outside）.
In addition, in the sonic velocity measurement method of the present invention, in the step of obtaining the longitudinal wave velocity of the measured object, m values are taken
It is 1, and frequency during by the 1st in addition to 0Hz sound intensity transmission coefficient peak value in the mapping table is brought into formulaIn, so as to obtain the longitudinal wave velocity of the measured object.
In addition, in the sonic velocity measurement method of the present invention, the direction of the launch of the measured object and the energy converter and described
The reception direction for receiving energy converter is vertical.
As described above, according to the present application, overcoming contact acoustic velocity measurement device in the prior art cannot measure not
Suitable contact material dredges soft material, the deficiency compared with the materials longitudinal wave velocity such as thin material, and probe is not needed in the present invention and is connect with measured object
It touches, it will be able to obtain accurate measured object longitudinal wave velocity.
Description of the drawings
Fig. 1 is vertical incidence, reflection and the schematic diagram of transmission of the sound wave in three layers of parallel medium.
Fig. 2 is figure of the sound intensity transmission coefficient with the variation tendency of the thickness of normalized medium.
Fig. 3 is the schematic diagram of the contactless solid material longitudinal wave velocity measuring device of the present invention.
Fig. 4 is the figure that the sound intensity transmission coefficient of one embodiment of the present of invention changes with frequency of sound wave.
Reference sign：
1 liquid tank
2 transmitting transducers
3 receive energy converter
4 measured objects
5 signal generators
6 signal acquisition process devices.
Specific embodiment
Hereinafter, based on attached drawing, the present invention will be described in detail.
First, the principle of the present invention is illustrated.Fig. 1 is vertical incidence of the sound wave in three layers of parallel medium, reflection
With the schematic diagram of transmission.As shown in Figure 1, sound wave enters medium 2 by medium 1 is incident, by reflecting and transmiting, one in medium 2
The energy reflected back into medium 1 of subwave, the energy transmission of a part of wave enter medium 3.If n-th layer（n=1,2,3）Medium it is close
Degree, acoustic speed are respectively ρn、vn, acoustic impedance Zn=ρn×vn, the thickness of medium 2 is d.Consider that stable state Acoustic Wave Propagation is asked
Topic, if frequency of sound wave is f, then angular frequency is ω=2 π f, the wave number k of n-th layer mediumnSuch as formula（1）It is shown,
(1),
The wavelength X of sound wave in n-th layer mediumnSuch as formula（2）It is shown,
(2),
By the sound intensity transmission coefficient T for being derived by three layers of mediumI, TISuch as formula（3）It is shown,
(3)。
If Z1=Z3, then TIWith normalization（The thickness of medium 2 divided by the wavelength of the wave in medium 2）Medium 2 thickness
Variation tendency as shown in Fig. 2, when the thickness d of medium 2 is half-wavelength in medium 2Integral multiple when sound intensity transmission coefficient most
Greatly, that is, it is most strong to transmit acoustic wave energy into medium 3 by medium 2 from medium 1 at this time.At this moment, if d is it is known that when transmiting most strong
The available words of the corresponding frequency of half-wavelength of sound wave, you can the longitudinal wave velocity in medium 2 is acquired according to formula (2).
Fig. 3 is the schematic diagram of the contactless solid material longitudinal wave velocity measuring device of the present invention.As shown in figure 3, this hair
Bright contactless solid material longitudinal wave velocity measuring device has liquid tank 1, transmitting transducer 2, receives energy converter 3 and letter
6 in number acquisition process.
Liquid tank 1 is full of the liquid for not destroying measured object characteristic according to the selection of measured object characteristic in the present invention.About liquid
Body slot 1 is not particularly limited, as long as liquid and measured object can be accommodated.In addition, as long as liquid is not in liquid tank 1
The characteristic of measured object is destroyed, there is no particularly limit in addition to this.Further, it is also possible to have signal generator, such as Fig. 3
Shown such, signal generator 5 exports a series of signal of frequency from low to high at equal intervals in the form of frequency sweep, to drive and believe
The connected transmitting transducer 2 of number generator 5 sends out a series of sound wave of different frequencies.Herein, the sound that transmitting transducer 2 is sent out
The frequency of wave can be set as needed, and the interval between different frequency can also be set as needed, as long as
It disclosure satisfy that measurement demand, such as can emit since 0MHz every 100Hz in the frequency range of 0Hz~10MHz
Sound wave（Such frequency transmitting sound wave that is, respectively with 100Hz, 200Hz, 300Hz, 400Hz ..., but not limited to this, Ke Yigen
The frequency and the frequency interval of transmitting sound wave for setting sound wave according to needing）.These sound waves from transmitting transducer 2 pass through after sending out
It crosses liquid medium and is incident on measured object 4, and received by the reception energy converter 3 on the right by the transmission of measured object 4.It receives
A series of respective transmission potentials of different frequency transmitted acoustic pulse, root is calculated in processing of the waveform Jing Guo signal acquisition process device 6
The longitudinal wave velocity of measured object can be just acquired according to corresponding frequency of sound wave during energy highest.In this way, using the present apparatus, measured object with
Probe is not in contact with having obtained its accurate longitudinal wave velocity.
Specifically, the working method of contactless solid material longitudinal wave velocity measuring device of the invention is as follows.
Signal generator 5 exports a series of signal of frequency from low to high at equal intervals in the form of frequency sweep, to drive and believe
The connected transmitting transducer 2 of number generator 5 sends out a series of sound wave of different frequencies, receives energy converter 3 and receive to carry out spontaneous emission and change
Device 2 and the sound wave of measured object 4 can have been penetrated, signal acquisition process device 6 to receive the waveform of sound wave that energy converter 3 receives into
Row processing, obtains a series of respective transmission potentials of different frequency transmitted acoustic pulse, and then it is saturating to obtain the sound intensity corresponding with each frequency
Coefficient is penetrated, establishes the mapping table of sound intensity transmission coefficient and each frequency, for example, as shown in figure 4.It then, will be in liquid tank 1
The liquid between transmitting transducer 2 and measured object 4（For example, water）As the 1st layer of medium, using measured object 4 as the 2nd layer
Medium and by measured object 4 and receive energy converter 3 between liquid（For example, water）As the 3rd layer of medium（In fact, the 1st layer of Jie
Matter and the 3rd layer of medium are identical media）If the density of n-th layer medium, acoustic speed are respectively ρn、vn, acoustic impedance Zn
=ρn×vn, the thickness of the 2nd layer of medium for d and is known, wherein, n=1,2,3, if frequency of sound wave is f, then angular frequency is
ω=2 π f, the wave number k of n-th layer mediumnBy above-mentioned formula（1）It shows, the wavelength X of sound wave in n-th layer mediumnBy above-mentioned formula
（2）It shows, the sound intensity transmission coefficient T of this three layers of media obtained accordinglyIBy above-mentioned formula（3）It shows, due in liquid tank
Only a kind of liquid（For example, water）, it may thus be appreciated that Z1=Z3, it is half-wavelength in the 2nd layer of medium in the thickness d of the 2nd layer of medium's
Integral multiple（That is, d=m ×, m is greater than the positive integer equal to 1）In the case of sound intensity transmission coefficient be maximum, it is herein, excellent
Choosing be take d=（That is, the situation of m=1）When sound intensity transmission coefficient be maximum, according to above-mentioned formula（2）It can obtain sound wave
Speed in the 2nd layer of mediumFor, correspondingly select the 1st in addition to the 0Hz sound intensity transmission coefficient in Fig. 4
Frequency values during peak value are brought into formulaIn, so as to obtain the longitudinal wave velocity of measured object 4.
In addition, in the above example, select m=1 and select the 1st in addition to 0Hz sound intensity transmission coefficient peak in Fig. 4
Frequency values during value obtain the longitudinal wave velocity of measured object.But this is naturally not limited to, it can also be according to actually measuring
Need to select m for other values（For example, 2,3 ... ...）And select frequency during m-th of sound intensity transmission coefficient maximum in Fig. 4
Rate value（That is, by the 1st, 2,3,4 other than the 0Hz in Fig. 4 ..., frequency values during m sound intensity transmission coefficient maximum are denoted as,,,,……）, and then according to above-mentioned formula（2）The longitudinal wave velocity of measured object 4 is obtained, at this point, measured object 4 is vertical
Wave sound speedFor。
As described above, in the present invention, it is calculated indirectly by corresponding frequency of sound wave during acoustic wave transmission energy maximum
Obtain the longitudinal wave velocity of accurate measured object.At the shape of device, signal form, the type selecting of energy converter, specific signal
Relative position between reason method and energy converter and measured object etc., does not limit in the present invention.But, it is contemplated that most
Good measurement effect, preferred scheme have：
（1）Measured object should be vertical with the direction of the launch of energy converter and reception direction holding；
（2）Measured object should be relatively regular object；
（3）Normalization of the acoustic wave transmission energy demand that data collection processor part obtains by transmitting transducer transmitting response；
（4）Corresponding Frequency point preferably chooses first crest frequency point in addition to 0Hz during transmission potential maximum when calculating the velocity of sound, this
The thickness of Shi Jiezhi 2 is equal to the half-wavelength of 2 medium wave of medium.
Embodiment
In order to illustrate present disclosure more detailed, a specific embodiment is enumerated below.If medium 1 and 3 is equal
It is water, medium 2 is the steel that thickness is 3mm, the velocity of sound is 5900m/s, then sound intensity transmission coefficient changes with frequency of sound wave such as Fig. 4 institutes
Show.Acoustic wave transmission is most strong under corresponding peak value represents this frequency near 1MHz, 2MHz, 3MHz frequency, except 0Hz nearby in addition to the
Frequency during one transmission coefficient peak value is 983330Hz, this frequency is multiplied by the thickness of steel multiplied by the velocity of sound that can obtain steel with 2
For 5899.98m/s, this is consistent with theoretical value.
As described above, embodiments of the present invention are illustrated, but the present invention is not limited thereto, it is understood that
The various combinations and various changes carried out in the range of the technological thought of the present invention are included in protection scope of the present invention
Within.
Claims (11)
1. a kind of contactless solid material longitudinal wave velocity measuring device, which is characterized in that have：
Liquid tank places measured object and filled with the liquid for the characteristic for not destroying the measured object wherein；
Transmitting transducer is configured in the side of the liquid tank, and sends out a series of sound wave of different frequencies；
Energy converter is received, is configured in the opposite side in the side with being configured with the transmitting transducer of the liquid tank, receives
Through the sound wave of the measured object；And
Signal acquisition process device, the waveform of sound wave received to the reception energy converter are handled, and obtain a series of differences
The respective transmission potential of frequency transmitted acoustic pulse obtains the vertical of the measured object according to corresponding frequency of sound wave during transmission potential highest
Wave sound speed.
2. contactless solid material longitudinal wave velocity measuring device as described in claim 1, which is characterized in that
According to a series of transmission potential of different frequency transmitted acoustic pulses obtained by the signal acquisition and processing apparatus, obtain with respectively
The corresponding sound intensity transmission coefficient of frequency establishes the mapping table of the sound intensity transmission coefficient and each frequency, according to the sound
Strong transmission coefficient obtains the longitudinal wave velocity of the measured object with the relationship of the thickness of the measured object and the mapping table.
3. contactless solid material longitudinal wave velocity measuring device as claimed in claim 2, which is characterized in that
Using the liquid between the transmitting transducer and the measured object in the liquid tank as the 1st layer of medium, incite somebody to action
The measured object is as the 2nd layer of medium and using the measured object and the liquid received between energy converter as the 3rd layer of Jie
Matter, if the density of n-th layer medium, acoustic speed are respectively、, acoustic impedance is, the 2nd layer of medium
Thickness is d, wherein, n=1,2,3,
If frequency of sound wave is f, then angular frequency is, the wave number k of n-th layer mediumnSuch as formula（1）It is shown,
(1),
The wavelength X of sound wave in n-th layer mediumnSuch as formula（2）It is shown,
(2),
The sound intensity transmission coefficient of the 1st, 2,3 layer of this three layers of medium is obtained as a result,,Such as formula（3）It is shown,
(3),
WhenWhen, it is half-wavelength in the 2nd layer of medium in the thickness d of the 2nd layer of mediumIntegral multiple situation
Under the sound intensity transmission coefficient be maximum, that is, when d=m ×Shi Suoshu sound intensity transmission coefficients are maximum, wherein, m is big
In the positive integer equal to 1, according to above-mentioned formula（2）It can obtain speed of the sound wave in the 2nd layer of medium,
WhereinFor corresponding frequency of sound wave during m-th of maximum of sound intensity transmission coefficient described in the mapping table, and
It is not 0.
4. contactless solid material longitudinal wave velocity measuring device as claimed in claim 3, which is characterized in that
M values are taken as 1, and frequency band during by the 1st in addition to 0Hz sound intensity transmission coefficient peak value in the mapping table
Enter to formulaIn, so as to obtain the longitudinal wave velocity of the measured object.
5. the contactless solid material longitudinal wave velocity measuring device as described in any one of Claims 1 to 4, feature exist
In,
The measured object is vertical with the direction of the launch of the energy converter and the reception direction for receiving energy converter.
6. the contactless solid material longitudinal wave velocity measuring device as described in any one of Claims 1 to 4, feature exist
In,
It is also equipped with：Signal generator is connect with the transmitting transducer, exports frequency from low to high at equal intervals in the form of frequency sweep
A series of signal the sound waves of different frequencies a series of is sent out with the transmitting transducer to drive.
7. a kind of sonic velocity measurement method in a non contact fashion measures solid material longitudinal wave velocity, which is characterized in that have
Following steps：
Transmitting transducer sends out a series of sound wave of different frequencies；
Receive the sound wave that energy converter receives from the transmitting transducer and penetrated measured object；And
The waveform of sound wave received to the reception energy converter is handled, and obtains a series of different frequency transmitted acoustic pulses respectively
Transmission potential, the longitudinal wave velocity of the measured object is obtained according to corresponding frequency of sound wave during transmission potential highest.
8. sonic velocity measurement method as claimed in claim 7, which is characterized in that
In the step of obtaining the longitudinal wave velocity of the measured object, according to a series of the saturating of obtained different frequency transmitted acoustic pulses
Energy is penetrated, obtains sound intensity transmission coefficient corresponding with each frequency, establishes sound intensity transmission coefficient pass corresponding with each frequency
It is table, the quilt is obtained according to the relationship and the mapping table of the sound intensity transmission coefficient and the thickness of the measured object
Survey the longitudinal wave velocity of object.
9. sonic velocity measurement method as claimed in claim 8, which is characterized in that
It, will be between the transmitting transducer and the measured object in the step of obtaining the longitudinal wave velocity of the measured object
Liquid as the 1st layer of medium, using the measured object as the 2nd layer of medium and by the measured object with it is described reception energy converter it
Between liquid as the 3rd layer of medium, if the density of n-th layer medium, acoustic speed are respectively、, acoustic impedance is, the thickness of the 2nd layer of medium is d, wherein, n=1,2,3,
If frequency of sound wave is f, then angular frequency is, the wave number k of n-th layer mediumnSuch as formula（1）It is shown,
(1),
The wavelength X of sound wave in n-th layer mediumnSuch as formula（2）It is shown,
(2),
The sound intensity transmission coefficient of the 1st, 2,3 layer of this three layers of medium is obtained as a result,,Such as formula（3）It is shown,
(3),
WhenWhen, it is half-wavelength in the 2nd layer of medium in the thickness d of the 2nd layer of mediumIntegral multiple situation
Under the sound intensity transmission coefficient be maximum, that is, when d=m ×Shi Suoshu sound intensity transmission coefficients are maximum, wherein, m is big
In the positive integer equal to 1, according to above-mentioned formula（2）It can obtain speed of the sound wave in the 2nd layer of medium,
WhereinFor corresponding frequency of sound wave during m-th of maximum of sound intensity transmission coefficient described in the mapping table, and
It is not 0.
10. sonic velocity measurement method as claimed in claim 9, which is characterized in that
In the step of obtaining the longitudinal wave velocity of the measured object, it is 1 to take m values, and will remove 0Hz in the mapping table
Frequency during outer 1st sound intensity transmission coefficient peak value is brought into formulaIn, so as to obtain the vertical of the measured object
Wave sound speed.
11. the sonic velocity measurement method as described in any one of claim 7~10, which is characterized in that
The measured object is vertical with the direction of the launch of the energy converter and the reception direction for receiving energy converter.
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Cited By (5)
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| CN109341839A (en) * | 2018-10-31 | 2019-02-15 | 西南交通大学 | Equipment, detection method and the application of shock velocity in a kind of test sample |
| CN110618198A (en) * | 2019-07-12 | 2019-12-27 | 中国矿业大学 | Test method for non-contact measurement of rock wave velocity in fidelity environment |
| CN113504307A (en) * | 2021-09-10 | 2021-10-15 | 西南石油大学 | Multi-frequency core sound velocity measuring device |
| CN114113331A (en) * | 2021-12-03 | 2022-03-01 | 上海船舶工程质量检测有限公司 | System and method for measuring longitudinal wave sound velocity distribution of material |
| CN114184146A (en) * | 2021-12-03 | 2022-03-15 | 上海船舶工程质量检测有限公司 | System and method for measuring longitudinal wave sound velocity distribution of high-sound attenuation/large-thickness material |
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| WO2021008229A1 (en) * | 2019-07-12 | 2021-01-21 | 中国矿业大学 | Testing method for non-contact measurement of rock wave velocity in fidelity environment |
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