CN106643592A - Method and apparatus for measuring thickness of intermediate layer of three-layer composite plate - Google Patents
Method and apparatus for measuring thickness of intermediate layer of three-layer composite plate Download PDFInfo
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- CN106643592A CN106643592A CN201611149279.5A CN201611149279A CN106643592A CN 106643592 A CN106643592 A CN 106643592A CN 201611149279 A CN201611149279 A CN 201611149279A CN 106643592 A CN106643592 A CN 106643592A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B17/00—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations
- G01B17/02—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations for measuring thickness
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Abstract
The invention relates to a method and apparatus for measuring the thickness of the intermediate layer of a three-layer composite plate. By means of the interface wave transmitted between the interfaces, the intermediate layer of the three-layer composite plate is excited to generate and receive a guided wave signal, and by means of the guided wave signal, the interface wave velocity is measured, and by changing the frequency of the excitation signal several times, the dispersion curve of the interface wave transmitting in the composite plate can be obtained, and the group velocity stable corner frequency can be found; By means of the consistence of the interface wave group velocity and the phase velocity stable corner frequency, by taking the product (namely frequency thickness product) of the phase velocity stable corner frequency and the thickness of the intermediate layer of the three-layer composite plate as a constant value, and by means of the principle that the phase velocity stable corner frequency is related to the thickness of the intermediate layer, in the case of known stable corner frequency, the frequency thickness product is divided by the stable corner frequency to obtain the accurate thickness of the intermediate layer of the three-layer composite plate The measurement method is simple and easy, high in measurement precision, and reliable in measurement result, and is suitable for the accurate measurement of the intermediate layer of the three-layer composite plate.
Description
Technical field
The disclosure belongs to frame for movement length field of precision measurement, and in particular to one kind is used to measure three-layer composite board intermediate layer
The method and apparatus of thickness.
Background technology
With the progress of science and technology, various the compound of excellent properties, intellectual material of possessing continuously emerge and are applied to existing
For in engineering structure.Traditional material is square in mechanical property, material behavior, stability, environmental resistance etc. because of its own limitation
Face shows certain inferior position, it is difficult to meet high performance requirements of the modern project application to material.Following material it is inevitable by
New artificial, compound of traditional natural, single steering.
Composite is by two or more material of different nature, by method physically or chemically, in macroscopic view
The material with new capability of upper composition.Laminated-metal composite be using complex technique make two or more physics,
Chemistry, the different metal of mechanical property strong bonded and a kind of advanced composite material (ACM) for being formed on interface.It can fully send out
Wave the feature performance benefit of each layer metal, overcome the defect of homogenous material, with any one group element material cannot possess it is comprehensive
Can, effectively expand engineer applied scope.Metal-base composites (MMC) is because of its distinctive high intensity, high rigidity, wear-resisting and resistance to height
The premium properties such as temperature, cause the common concern of domestic and international material supply section scholar, have developed into a weight of advanced composite material
Want branch.The depth of investigation of advanced metallic composite and apply range, it has also become weigh national science and technology development level
Mark.
And current laminated-metal composite is during processing use, also there is a problem of one critically important, i.e. hardly possible
Directly to carry out accurate measurement to each thickness degree of composite.At present to the determination of its each thickness degree mainly by processing technology protecting
Card, it is difficult to carry out direct measurement, have low precision, easily be difficult to find because the defect in process causes thickness to change
Shortcoming, bring very big hidden danger to the performance guarantee of laminated-metal composite.
The content of the invention
For above-mentioned subproblem, the disclosure is on the one hand using this new tool of supersonic guide-wave, it is proposed that a kind of to multilayer
Composite intermediate layer thickness carries out the method and apparatus of accurate measurement.Interface in methods described and equipment utilization supersonic guide-wave
The stable corner frequency of ripple is this principle realization of certain value with the product of intermediate layer thickness of slab, and its computational accuracy is high, detection operation side
Just, low cost, simple and reliable, improves aluminum steel titanium composite panel intermediate layer thickness measurement efficiency and accuracy, there is great engineering
Meaning.
On the one hand, present disclose provides a kind of method for measuring three-layer composite board intermediate layer thickness, methods described bag
Include following step：
S100, the thick product of frequency for obtaining tested three-layer composite board；
S200, the interface wave dispersion curve for obtaining tested three-layer composite board；
S300, corresponding frequency when frequency dispersion switchs to not frequency dispersion of signal on the interface wave dispersion curve is found, by this
Frequency is used as the stable corner frequency of interface group velocity；
S400, try to achieve tested three-layer composite board intermediate layer thickness according to following formula：
Further, the interface wave dispersion curve is obtained by following step：
S201, tested three-layer composite board interlayer interface two ends distinguish adhesive surface wave sensor；
S202, the boundary wave propagated between interface using surface wave sensor, are swashed in the intermediate layer of tested three-layer composite board
Encourage generation and receive guided wave signals；
The guided wave signals that S203, utilization are received, obtain boundary wave velocity of wave；
S204, the frequency for changing surface wave sensor pumping signal, draw driving frequency-velocity of wave curve, obtain boundary wave
Dispersion curve when tested three-layer composite board is propagated.
Further, the thick product of the frequency is obtained by following step：
S101, emulated by pair three-layer composite board that there is identical material with tested three-layer composite board, obtain phase velocity
Degree dispersion curve；
S102, find from the phase velocities dispersion curve the stable corner frequency of phase velocity, try to achieve described tested three layers it is multiple
The thick product of the frequency of plywood.
Further, also include before step S204：
S2041, estimate tested three-layer composite board intermediate layer thickness scope；
S2042, the thick product of frequency for utilizing acquisition, estimate interface group velocity and stablize corner frequency model according to the acquisition of following formula
Enclose, so that it is determined that the frequency range of surface wave sensor pumping signal：
Further, the step of guided wave signals that the utilization is received, includes what is collected using Hilbert transform pairs
Signal carries out envelope processing analysis.
Further, the surface wave sensor is selected according to the stable transition frequency range of interface group velocity is estimated, and is made
The stable corner frequency of the close interface group velocity of its centre frequency.
Another fermentation, present disclose provides a kind of equipment for measuring three-layer composite board intermediate layer thickness, the equipment
Including the first acquisition module, the second acquisition module, locating module, the first computing module, wherein：
First acquisition module, is arranged to：Obtain the thick product of frequency of tested three-layer composite board；
Second acquisition module, is arranged to：Obtain the interface wave dispersion curve of tested three-layer composite board；
The locating module, is arranged to：Find signal on the interface wave dispersion curve and not frequency dispersion is switched to by frequency dispersion
Corresponding frequency, using the frequency as the stable corner frequency of interface group velocity；
First computing module, is arranged to：Tested three-layer composite board intermediate layer thickness is tried to achieve according to following formula：
Further, the equipment also includes surface wave sensor, for being pasted onto the intermediate layer of tested three-layer composite board
Interface two ends；
The surface wave sensor excitation in intermediate layer at one end produces guided wave signals, and the guided wave signals are between interface with interface
The form of ripple is propagated, and in the surface wave sensor of the other end guided wave signals are received.
Further, the equipment also includes simulation algorithm model, and it is arranged to：It is compound with tested three layers by pair
The three-layer composite board that plate has identical material is emulated, and obtains respective phase velocities dispersion curve；And from phase velocity frequency
The stable corner frequency of phase velocity is found on non-dramatic song line, the thick product of frequency of the tested three-layer composite board is tried to achieve.
Further, the equipment also includes estimating module, and it is arranged to：According to the tested three-layer composite board estimated
Intermediate layer thickness scope, using the thick product of the frequency for obtaining, obtains according to following formula and estimates the stable corner frequency of interface group velocity
Scope, so that it is determined that the frequency range of surface wave sensor pumping signal：
Further, the simulation algorithm model includes Envelope Analysis unit, and it is arranged to：Become using Hilbert
Changing the signal to collecting carries out envelope processing analysis.
Further, the surface wave sensor is selected according to the stable transition frequency range of interface group velocity is estimated, and is made
The stable corner frequency of the close interface group velocity of its centre frequency.
To sum up, because the disclosure employs boundary wave in the intermediate layer thickness measurement of three-layer composite board, the disclosure is relative
There is following significant advantage in conventional method：
(1) disclosure can be used for the occasion that some are unable to direct measurement thickness, solve traditional measurement method to composite plate
The problem that intermediate layer thickness cannot be measured；
(2) disclosure has no effect in itself to composite plate, can be right on the basis of composite plate performance is not affected
The thickness of its each layer is measured；
(3) boundary wave has after corner frequency is stablized the not characteristic of frequency dispersion, it is ensured that the stable corner frequency of its phase velocity
It is consistent with the stable corner frequency of group velocity；
(4) disclosure computational accuracy height, low cost, detect easy to operate, improve each thickness degree measurement efficiency of composite plate；
(5) disclosure is simple and reliable, used in being easy to engineering practice.
Description of the drawings
Three-layer composite board I1 patterns and I2 mode interfaces wave frequency dissipate when Fig. 1 is respectively 0.04m and 0.02m for intermediate layer thickness
Curve synoptic diagram；
Fig. 2 is the phase velocities dispersion curve of the material three-layer composite board median surface ripple；
In figure：Longer line represents I1 patterns (the interface wave mode between aluminum steel interface) the boundary wave frequency dispersion song that measurement is used
Line, it is 261.25KHz that stable turning point is frequency, and shorter line is the interface of I2 patterns (the interface wave mode between steel titanium interface)
Ripple；
Fig. 3 is sensor scheme of installation in aluminum steel titanium composite panel, wherein 1,2 are respectively stimulus sensor and receive sensing
Device, l is Al-Steel interface lengths, and d is intermediate layer thickness；
In figure：Solid line is the situation that intermediate layer thickness is 0.04m, and dotted line is the situation that intermediate layer thickness is 0.02m；
Fig. 4 is to receive the signal that sensor is received, and crest 1, crest 2 are respectively direct-path signal and reflection echo letter
Number, the crest corresponding time is respectively t1And t2；
Fig. 5 is that the signal to receiving carries out the signal after Hilbert transform, and crest 1, crest 2 are respectively t1And t2When
Signal.
Specific embodiment
One of purpose of the disclosure is to provide a kind of inspection for detecting the simple accurate three-layer composite board intermediate layer thickness of calculating
Survey method.Below method of disclosure content is told about with regard to Fig. 1-5.
Step (one), the thick product of frequency for obtaining tested three-layer composite board
The thick product of the frequency of three-layer composite board is only relevant with the material of three ply board, can obtain tested three layers by way of emulation
The thick product of the frequency of composite plate, specifically can be carried out using following step：
S101, emulated by pair three-layer composite board that there is identical material with tested three-layer composite board, obtain phase velocity
Degree dispersion curve；
S102, find from the phase velocities dispersion curve the stable corner frequency of phase velocity, try to achieve described tested three layers it is multiple
The thick product of the frequency of plywood.
Wherein, dispersion curve is the relation curve of velocity of wave and driving frequency.
Step (two), the interface wave dispersion curve for obtaining tested three-layer composite board
The interface wave dispersion curve is preferably obtained by following step：
S201, tested three-layer composite board interlayer interface two ends distinguish adhesive surface wave sensor；
S202, the boundary wave propagated between interface using surface wave sensor, are swashed in the intermediate layer of tested three-layer composite board
Encourage generation and receive guided wave signals；
The guided wave signals that S203, utilization are received, obtain boundary wave velocity of wave；
S204, the frequency for changing surface wave sensor pumping signal, draw driving frequency-velocity of wave curve, obtain boundary wave
Dispersion curve when tested three-layer composite board is propagated.
Meet desired interface wave dispersion curve to obtain, the centre frequency of the surface wave sensor for using is preferably on boundary
Near the stable corner frequency of face group velocity, accordingly, it would be desirable to group velocity stable corner frequency in interface is estimated, to determine
The centre frequency of surface wave sensor.Group velocity stable corner frequency in interface is carried out estimating and can adopt following step：
S2041, estimate tested three-layer composite board intermediate layer thickness scope；
S2042, the thick product of frequency for utilizing acquisition, estimate interface group velocity and stablize corner frequency model according to the acquisition of following formula
Enclose, so that it is determined that the frequency range of surface wave sensor pumping signal：
Due to surface wave sensor, its centre frequency typically has 0.5MHz, 1MHz, 1.5MHz etc., and distribution more disperses, institute
With the possibility that there is the centre frequency of none of sensor in the central frequency range estimated, but and because surface wave
Sensor bandwidth is very big, therefore only needs to find centre frequency and be close to and estimate the surface wave sensor of frequency and just can complete to survey
Amount.
In step S203, include carrying out envelope processing analysis to signal the step of using the guided wave signals for receiving,
Hilbert transform can be used in this method, it is also possible to process is analyzed to the signal for gathering using other methods.
Step (three), frequency of the signal by corresponding to frequency dispersion switchs to not frequency dispersion on the interface wave dispersion curve is found, will
The frequency is used as the stable corner frequency of interface group velocity
Step (four), try to achieve tested three-layer composite board intermediate layer thickness according to following formula：
As seen from the above, method of disclosure is consistent, frequently using the stable corner frequency of interface group velocity and phase velocity
Thickness product is certain value and stable corner frequency and this principle relevant with intermediate layer thickness, in the situation of known stable corner frequency
Under, with the thick product of frequency with stablize corner frequency and be business, and then obtain the exact thickness in three-layer composite board intermediate layer.This method can be with
Solving traditional measurement method cannot measure composite plate intermediate layer thickness, can not affect composite plate usability
The thickness of its each layer is measured on the basis of energy and composite plate is had no effect, and computational accuracy is high, detect operation
It is convenience, low cost, simple and reliable, three-layer composite board intermediate layer thickness measurement efficiency and accuracy are improve, with widely fitting
The property used.
This method is applied to the measurement of aluminum steel titanium composite panel intermediate layer thickness by example below, wherein：Aluminum steel titanium composite panel
Aluminum steel titanium three ply board is bonded together successively, that is, is connected as welding completely.
First, the thick product of frequency of the aluminum steel titanium composite panel is obtained.Three-layer composite board has following features：
(1) for the three-layer composite board of phase same material, its intermediate layer thickness is different, and phase velocity stablizes corner frequency also not
Together.The material three-layer composite board I1 patterns and I2 mode interface ripples when Fig. 1 is respectively 0.04m and 0.02m for intermediate layer thickness
Dispersion curve, wherein, I1 patterns are the interface wave mode between aluminum steel interface, and I2 patterns are the interface wave mode between steel titanium interface,
Solid line represents intermediate layer thickness as the situation of 0.04m, and dotted line represents intermediate layer thickness as the situation of 0.02m, under I2 patterns, two
The curve for planting thickness almost overlaps.As can be seen from Figure 1 the phase velocity of the three-layer composite board of different intermediate layer thickness stablizes corner frequency
It is different.
(2) the thick product of frequency is relevant with the material of three-layer composite board, although three-layer composite board intermediate layer thickness is different, and phase velocity is steady
Determine that corner frequency is also different, but the thick product of the frequency of phase same material upper bound face ripple is identical, i.e.,：The thick product of the frequency of identical material is fixed for one
Value, the definite value is equal to the stable corner frequency of phase velocity and the composite plate intermediate layer when boundary wave is propagated between the compound board interface
The product of thickness.This point can be by obtaining to the emulation of identical material, different-thickness three-layer composite board.
Here, respectively to intermediate layer thickness for 0.01m, 0.02m, 0.03m, 0.04m, 0.05m aluminum steel titanium composite panel
Emulated.Fig. 2 illustrates bent for the phase velocity frequency dispersion that 0.04m carries out boundary wave emulation to aluminum steel titanium composite panel intermediate layer thickness
Line.Interface wave mode between aluminum steel interface is denoted as into I1 patterns, the interface wave mode between steel titanium interface is denoted as into I2 patterns, Fig. 2
In longer line represent the I1 patterns that measurement is used, shorter line is I2 patterns.From corresponding figure, find phase velocity and stably turn
Folding frequency simultaneously calculates the thick product of frequency, as a result as shown in subscript 1, it is known that the interface wave frequency thickness product of I1 patterns is in aluminum steel titanium composite panel
10.45kHzm, the thick product of frequency of identical material is a definite value.
Table 1：
As known from Table 1, although the phase velocity of different-thickness stablizes corner frequency difference, but the thick product of their frequency is identical.
Therefore, during actual measurement, for the thick product of the frequency for obtaining aluminum steel titanium composite panel, can adopt for tested aluminum steel titanium composite panel has
The three-layer composite board of phase same material is once emulated.
Secondly, tested aluminum steel titanium composite panel intermediate layer thickness scope is estimated；Using the thick product of the frequency for obtaining, according to following formula
The stable transition frequency range of interface group velocity is estimated in acquisition, so that it is determined that the frequency range of surface wave sensor pumping signal：
According to above-mentioned result of calculation, the surface wave sensor for having apart from the nearest centre frequency of the result is selected, by table
Wave sensor is pasted onto the intermediate layer of aluminum steel titanium composite panel, as shown in figure 3, paste excitation respectively at interlayer interface two ends passing
Sensor and reception sensor, wherein：1st, 2 it is respectively stimulus sensor and receives sensor, l is Al-Steel interface lengths, and d is
Intermediate layer thickness.
Fig. 4 is to receive the signal that sensor is received.Signal is carried out using Hilbert transform or with other methods
Envelope processing is analyzed, and is obtained crest 1, crest 2 and is respectively direct-path signal and reflection echo signal, and crest 1,2 points of crest
Not corresponding time t1And t2As shown in Figure 4.Thus, it is possible to the velocity of wave v for obtaining boundary wave is：
Change driving frequency, obtain multigroup value of wave speed, draw out the relation curve of velocity of wave v and driving frequency f, obtain interface
Interface wave dispersion curve of the ripple when tested three-layer composite board is propagated.
Then, corresponding frequency when frequency dispersion switchs to not frequency dispersion of signal is found from the interface wave dispersion curve, will
The frequency is used as the stable corner frequency of interface group velocity.
Finally, tested three-layer composite board intermediate layer thickness is tried to achieve according to following formula：
Another fermentation, present disclose provides a kind of equipment for measuring three-layer composite board intermediate layer thickness, the equipment
Including the first acquisition module, the second acquisition module, locating module, the first computing module, wherein：
First acquisition module, is arranged to：Obtain the thick product of frequency of tested three-layer composite board；
Second acquisition module, is arranged to：Obtain the interface wave dispersion curve of tested three-layer composite board；
The locating module, is arranged to：Find signal on the interface wave dispersion curve and not frequency dispersion is switched to by frequency dispersion
Corresponding frequency, using the frequency as the stable corner frequency of interface group velocity；
First computing module, is arranged to：Tested three-layer composite board intermediate layer thickness is tried to achieve according to following formula：
Further, the equipment also includes surface wave sensor, for being pasted onto the intermediate layer of tested three-layer composite board
Interface two ends；
The surface wave sensor excitation in intermediate layer at one end produces guided wave signals, and the guided wave signals are between interface with interface
The form of ripple is propagated, and in the surface wave sensor of the other end guided wave signals are received.
Further, the equipment also includes simulation algorithm model, and it is arranged to：It is compound with tested three layers by pair
The three-layer composite board that plate has identical material is emulated, and obtains respective phase velocities dispersion curve；And from phase velocity frequency
The stable corner frequency of phase velocity is found on non-dramatic song line, the thick product of frequency of the tested three-layer composite board is tried to achieve.
Further, the equipment also includes estimating module, and it is arranged to：According to the tested three-layer composite board estimated
Intermediate layer thickness scope, using the thick product of the frequency for obtaining, obtains according to following formula and estimates the stable corner frequency of interface group velocity
Scope, so that it is determined that the frequency range of surface wave sensor pumping signal：
Further, the simulation algorithm model includes Envelope Analysis unit, and it is arranged to：Become using Hilbert
Changing the signal to collecting carries out envelope processing analysis.Wherein, Hilbert transform can be entered using other envelope processing methods
Row is replaced.
Further, the surface wave sensor is selected according to the stable transition frequency range of interface group velocity is estimated, and is made
The stable corner frequency of the close interface group velocity of its centre frequency.
Through the above description of the embodiments, those skilled in the art can be understood that disclosure equipment
Can add the mode of required common hardware to realize by software, naturally it is also possible to realize by specialized hardware, wherein special
Hardware includes special IC, dedicated cpu, private memory, special components and parts etc..Generally, it is all by computer journey
The function that sequence is completed can realize easily with corresponding hardware, and, for realizing the particular hardware of same function
Structure can also be diversified, such as analog circuit, digital circuit or special circuit etc..But, for purposes of this disclosure more
It is more preferably embodiment the data processing content such as in the case of many, to be related to emulate, calculate by software program realization.Based on so
Understanding, except using surface wave sensor produce and acquisition interface ripple signal in addition to, in the technical scheme of the disclosure to signal at
Reason, simulation calculation and/or calculating section can be embodied in the form of software product, and the computer software product is stored in
In the storage medium that can read, such as the floppy disk of computer, USB flash disk, portable hard drive, read-only storage (ROM, Read-Only
Memory), random access memory (RAM, Random Access Memory), magnetic disc or CD etc., including some instructions
With so that computer equipment (can be personal computer, server, or network equipment etc.) perform the disclosure each
Method described in embodiment.
A kind of method of the aluminum steel titanium composite panel intermediate layer thickness measurement for being provided the disclosure above has carried out detailed Jie
Continue, specific case principle of this disclosure used herein and embodiment are set forth, the explanation of above example is only
It is to be used to help understand disclosed method and its core concept；Simultaneously for those skilled in the art, according to the think of of the disclosure
Think, will change in specific embodiments and applications, such as can apply to method of disclosure and device
The composite plate of nonmetallic materials, such as glass material.In sum, this specification content should not be construed as restriction of this disclosure.
Claims (10)
1. a kind of method for measuring three-layer composite board intermediate layer thickness, it is characterised in that methods described comprises the steps：
S100, the thick product of frequency for obtaining tested three-layer composite board；
S200, the interface wave dispersion curve for obtaining tested three-layer composite board；
S300, corresponding frequency when frequency dispersion switchs to not frequency dispersion of signal on the interface wave dispersion curve is found, by the frequency
As the stable corner frequency of interface group velocity；
S400, try to achieve tested three-layer composite board intermediate layer thickness according to following formula：
2. method according to claim 1, it is characterised in that preferred, the interface wave dispersion curve is by following steps
It is rapid to obtain：
S201, tested three-layer composite board interlayer interface two ends distinguish adhesive surface wave sensor；
S202, the boundary wave propagated between interface using surface wave sensor, are produced in the intermediate layer excitation of tested three-layer composite board
Raw and reception guided wave signals；
The guided wave signals that S203, utilization are received, obtain boundary wave velocity of wave；
S204, the frequency for changing surface wave sensor pumping signal, draw driving frequency-velocity of wave curve, obtain boundary wave in quilt
Survey dispersion curve when three-layer composite board is propagated.
3. method according to claim 1, it is characterised in that the thick product of the frequency is obtained by following step：
S101, emulated by pair three-layer metal composite plate that there is identical material with tested three-layer composite board, obtain phase velocity
Degree dispersion curve；
S102, the stable corner frequency of phase velocity is found from the phase velocities dispersion curve, try to achieve the tested three-layer composite board
The thick product of frequency.
4. method according to claim 2, it is characterised in that also include before step S204：
S2041, estimate tested three-layer composite board intermediate layer thickness scope；
S2042, the thick product of frequency for utilizing acquisition, estimate interface group velocity and stablize transition frequency range according to the acquisition of following formula,
So that it is determined that the frequency range of surface wave sensor pumping signal：
5. method according to claim 4, it is characterised in that：
The surface wave sensor is selected according to the stable corner frequency of interface group velocity is estimated so as to the close interface of centre frequency
The stable corner frequency of group velocity.
6. a kind of equipment for measuring three-layer composite board intermediate layer thickness, it is characterised in that：
The equipment includes the first acquisition module, the second acquisition module, locating module, the first computing module, wherein：
First acquisition module, is arranged to：Obtain the thick product of frequency of tested three-layer composite board；
Second acquisition module, is arranged to：Obtain the interface wave dispersion curve of tested three-layer composite board；
The locating module, is arranged to：Finding on the interface wave dispersion curve signal, to switch to not frequency dispersion institute by frequency dispersion right
The frequency answered, using the frequency as the stable corner frequency of interface group velocity；
First computing module, is arranged to：Tested three-layer composite board intermediate layer thickness is tried to achieve according to following formula：
7. equipment according to claim 6, it is characterised in that：
The equipment also includes surface wave sensor, for being pasted onto the interlayer interface two ends of tested three-layer composite board；
The surface wave sensor excitation in intermediate layer at one end produces guided wave signals, and the guided wave signals are between interface with boundary wave
Form is propagated, and in the surface wave sensor of the other end guided wave signals are received.
8. equipment according to claim 6, it is characterised in that：
The equipment also includes simulation algorithm model, and it is arranged to：There is identical material with tested three-layer composite board by pair
Material three-layer composite board is emulated, and obtains phase velocities dispersion curve；And it is steady to find phase velocity from the phase velocities dispersion curve
Determine corner frequency, try to achieve the thick product of frequency of the tested aluminum steel titanium composite panel.
9. method according to claim 6, it is characterised in that：
The equipment also includes estimating module, and it is arranged to：According to the tested three-layer composite board intermediate layer thickness model estimated
Enclose, using the thick product of the frequency for obtaining, obtained according to following formula and estimate the stable transition frequency range of interface group velocity, so that it is determined that
The frequency range of surface wave sensor pumping signal：
10. method according to claim 7, it is characterised in that：
The surface wave sensor is selected according to the stable transition frequency range of interface group velocity is estimated so as to which centre frequency is close to
The stable corner frequency of interface group velocity.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108426545A (en) * | 2018-03-22 | 2018-08-21 | 天津大学 | A method of using ultrasonic surface wave non-destructive testing film thickness |
| CN111307940A (en) * | 2020-04-01 | 2020-06-19 | 东北电力大学 | Method for determining circumferential guided wave excitation frequency interval of metal pipeline |
| CN113587866A (en) * | 2021-07-12 | 2021-11-02 | 西安交通大学 | Method for nondestructive measurement of thickness of thin film coating based on grating laser ultrasonic acoustic spectrum |
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| JP2011002470A (en) * | 2010-10-04 | 2011-01-06 | Mitsubishi Chemicals Corp | Method for measuring thickness of deposit layer on internal surface of tubular body |
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