CN106949860A - Inner-walls of duct detecting system and method - Google Patents
Inner-walls of duct detecting system and method Download PDFInfo
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- CN106949860A CN106949860A CN201710342600.XA CN201710342600A CN106949860A CN 106949860 A CN106949860 A CN 106949860A CN 201710342600 A CN201710342600 A CN 201710342600A CN 106949860 A CN106949860 A CN 106949860A
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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 provides a kind of inner-walls of duct detecting system and method, it is related to Microwave Detecting Technology field.The system includes：Vector network analyzer device, coaxial feed end cap device and terminal short circuit end cap.The input of the coaxial feed end cap device is connected with the vector network analyzer device, and the output end of the coaxial feed end cap device is used for the one end for being connected to pipe under test.The terminal short circuit end cap is used to be connected to the other end of the pipe under test, so that the coaxial feed end cap device and the terminal short circuit end cap close off the pipe under test two ends and constitute microwave cavity.Transmitted over long distances in pipe under test by microwave with this, form microwave cavity, realize the long range detection of pipe under test.
Description
Technical field
The present invention relates to Microwave Detecting Technology field, in particular to a kind of inner-walls of duct detecting system and method.
Background technology
Metallic conduit is widely used in industrial production, for example：The fields such as oil gas transmission, chemical industry, nuclear industry.Such as can not and
Shi Faxian simultaneously disposes the thinned problem of inner-walls of duct, then can cause to transmit the serious harm of goods and materials leakage.Therefore, metal pipe internal wall
Thinned detection and pipeline life, which are assessed, just seems particularly significant.In recent years, the detection method applied to metallic conduit mainly has：
Ray method, ultrasonic method, eddy current detection method etc..But in addition to ultrasonic guided wave detecting, above-mentioned all kinds of methods only can be to placing
The regional area of detection means is estimated, for the pipe detection of long range, it is meant that to spend the more time
And labour.In addition, supersonic guide-wave is more serious in the weld decay of pipeline, and pipeline environment is equally directly affected
The decay of supersonic guide-wave.There is presently no the long range detection that preferable scheme realizes pipeline.
The content of the invention
It is an object of the invention to provide a kind of inner-walls of duct detecting system and method, it can improve above mentioned problem.For
Above-mentioned purpose is realized, the technical scheme that the present invention takes is as follows：
In a first aspect, the embodiments of the invention provide a kind of inner-walls of duct detecting system, the system includes：Vector network
Analyzer, coaxial feed end cap device and terminal short circuit end cap.The input of the coaxial feed end cap device with it is described
Vector network analyzer device is connected, and the output end of the coaxial feed end cap device is used for the one end for being connected to pipe under test.
The terminal short circuit end cap is used to be connected to the other end of the pipe under test, so as to the coaxial feed end cap device and described
Terminal short circuit end cap closes off the pipe under test two ends and constitutes microwave cavity.The vector network analyzer device is used for
Export microwave and by the microwave transmission to the coaxial feed end cap device.The coaxial feed end cap device is used to receive
In the microwave propagation arrived to the pipe under test, and receive standing wave, the standing wave from the microwave along to the end
The part of terminal shortcircuit end cap direction transmission and the partial stack being reflected back via the terminal short circuit end cap are formed.The coaxial feed
The standing wave that electric end cap device is additionally operable to receive is transmitted to the vector network analyzer device.The vector network analyzer
Device is additionally operable to handle the standing wave to obtain the inner wall thickness situation of the pipe under test.
In preferred embodiments of the present invention, above-mentioned vector network analyzer device include vector network analyzer and with institute
State the computing terminal of vector network analyzer electrical connection.The vector network analyzer connects with the coaxial feed end cap device
Connect.The vector network analyzer is used to export microwave and by the microwave transmission to the coaxial feed end cap device.It is described
Vector network analyzer is additionally operable to handle the standing wave to obtain the first resonant frequency of the pipe under test.The computing terminal
For handling the first resonant frequency of the pipe under test got to obtain the inner wall thickness situation of the pipe under test.
In preferred embodiments of the present invention, above-mentioned coaxial feed end cap device includes antenna and coaxial feed end cap.Institute
The tip side for stating antenna is connected with the vector network analyzer.Through hole, the antenna are provided with the coaxial feed end cap
Sending and receiving end be used for extended through the through hole in the pipe under test.The output end of the coaxial feed end cap is used to connect
In one end of the pipe under test, described test tube is treated so that the coaxial feed end cap and the terminal short circuit end cap are closed off
Road two ends constitute microwave cavity.The antenna is used in the microwave propagation to the pipe under test that will receive, and
Standing wave is received, the standing wave is from edge in the microwave to the part of terminal short circuit end cap direction transmission and via the terminal short circuit
The partial stack that end cap is reflected back is formed.The standing wave that the antenna is additionally operable to receive is transmitted to the vector network analysis
Instrument.
In preferred embodiments of the present invention, the tip side of above-mentioned antenna is connected with the vector network analyzer by cable
Connect, the shell of the sending and receiving end of the antenna is electrically connected with the input of the coaxial feed end cap by conductive silver glue.
In preferred embodiments of the present invention, above-mentioned antenna is coaxial antenna.The cable is coaxial cable.
In preferred embodiments of the present invention, the output end of above-mentioned coaxial feed end cap is described for being threadingly attached to
One end of pipe under test.The terminal short circuit end cap is used for the other end for being threadingly attached to the pipe under test.
Second aspect, it is described applied to above-mentioned system the embodiments of the invention provide a kind of inner-walls of duct detection method
Method includes：The vector network analyzer device output microwave simultaneously fills the microwave transmission to the coaxial feed end cap
Put；The coaxial feed end cap device is by the microwave propagation received to the pipe under test, and receives standing wave, institute
State standing wave from the microwave along the part transmitted to the terminal short circuit end cap direction and anti-via the terminal short circuit end cap
The partial stack being emitted back towards is formed；The coaxial feed end cap device also transmits the standing wave received to the vector network analysis
Instrument apparatus；The vector network analyzer device also handles the standing wave to obtain the inner wall thickness situation of the pipe under test
The embodiments of the invention provide a kind of inner-walls of duct detecting system and method, the system includes：Vector network point
Analyzer device, coaxial feed end cap device and terminal short circuit end cap.The input of the coaxial feed end cap device and the arrow
The connection of network analysis instrument apparatus is measured, the output end of the coaxial feed end cap device is used for the one end for being connected to pipe under test.Institute
The other end that terminal short circuit end cap is used to be connected to the pipe under test is stated, so as to the coaxial feed end cap device and the end
Terminal shortcircuit end cap closes off the pipe under test two ends and constitutes microwave cavity.The vector network analyzer device is used for defeated
Go out microwave and by the microwave transmission to the coaxial feed end cap device.The coaxial feed end cap device is used to receive
The microwave propagation to the pipe under test in, and receive standing wave, the standing wave from the microwave along to the terminal
The part of short-circuit end cap direction transmission and the partial stack being reflected back via the terminal short circuit end cap are formed.The coaxial feed
The standing wave that end cap device is additionally operable to receive is transmitted to the vector network analyzer device.The vector network analyzer dress
Put and be additionally operable to handle the standing wave to obtain the inner wall thickness situation of the pipe under test.With this by microwave in pipe under test
Transmit over long distances, form microwave cavity, realize the long range detection of pipe under test.
Brief description of the drawings
Technical scheme in order to illustrate more clearly the embodiments of the present invention, below will be attached to what is used needed for embodiment
Figure is briefly described, it will be appreciated that the following drawings illustrate only certain embodiments of the present invention, therefore is not construed as pair
The restriction of scope, for those of ordinary skill in the art, on the premise of not paying creative work, can also be according to this
A little accompanying drawings obtain other related accompanying drawings.
Fig. 1 is a kind of applied environment of the inner-walls of duct detecting system of the offer of first embodiment of the invention；
The structure before and after Cavity perturbation in the inner-walls of duct detecting system that Fig. 2 provides for first embodiment of the invention is shown
It is intended to；
Another applied environment for the inner-walls of duct detecting system that Fig. 3 provides for first embodiment of the invention；
The Frequency sweep experiments result schematic diagram that Fig. 4 provides for first embodiment of the invention；
Resonance frequency shift amount and thickness thinning schematic diagram data that Fig. 5 provides for first embodiment of the invention；
The measured value and actual value number for the equivalent volume that Fig. 6 is thinned for a kind of pipe under test inwall that first embodiment is provided
According to schematic diagram；
The flow chart for the inner-walls of duct detection method that Fig. 7 provides for second embodiment of the invention.
In figure：100- vector network analyzer devices；101- vector network analyzers；102- computing terminals；103- cables；
110- coaxial feed end cap devices；111- antennas；111a- tip sides；111b- sending and receiving ends；111c- shells；112- coaxial feeds
End cap；120- terminal short circuit end caps；200- pipe under test；Pipe fitting is not thinned by 210-；Pipe fitting is thinned in 220-.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
A part of embodiment of the present invention, rather than whole embodiments.Present invention implementation generally here described and illustrated in accompanying drawing
The component of example can be arranged and designed with a variety of configurations.
Therefore, the detailed description of embodiments of the invention below to providing in the accompanying drawings is not intended to limit claimed
The scope of the present invention, but be merely representative of the present invention selected embodiment.Based on the embodiment in the present invention, this area is common
The every other embodiment that technical staff is obtained under the premise of creative work is not made, belongs to the model that the present invention is protected
Enclose.
It should be noted that：Similar label and letter represents similar terms in following accompanying drawing, therefore, once a certain Xiang Yi
It is defined in individual accompanying drawing, then it further need not be defined and explained in subsequent accompanying drawing.
In the description of the invention, it is necessary to explanation, the orientation of the instruction such as term " " center ", " on ", " interior ", " parallel "
Or position relationship is or the orientation that the invention product is usually put when using based on orientation shown in the drawings or position relationship
Or position relationship, it is for only for ease of the description present invention and simplifies description, rather than indicates or imply signified device or element
There must be specific orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.In addition,
Term " first ", " second ", " the 3rd " etc. are only used for distinguishing description, and it is not intended that indicating or implying relative importance.
In the description of the invention, in addition it is also necessary to explanation, unless otherwise clearly defined and limited, term " connection " should
It is interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or is integrally connected；Can be that machinery connects
Connect or electrically connect；Can be joined directly together, can also be indirectly connected to by intermediary, can be in two elements
The connection in portion.For the ordinary skill in the art, the tool of above-mentioned term in the present invention can be understood with concrete condition
Body implication.
In addition, the term such as " output ", " transmission " is understood as describing a kind of microwave signal, Electric signal processing.It is such as " defeated
Go out " only refer to microwave signal or electric signal by there occurs after the equipment, instrument or device in microwave or electrically
Change so that the microwave signal or the electric signal are processed, and then obtain implementation technical scheme or solve technical problem
Required signal.
In the specific embodiment accompanying drawing of the present invention, in order in more preferable, clearer description inner-walls of duct detecting system
Microwave signal or the current logic of electric signal in each equipment, the operation principle of instrument and device, the performance system are simply obvious
The relative position relation between each equipment, instrument and device has been distinguished, can not have been constituted to microwave, circuit direction and equipment and instrument
Size, size, the restriction of shape.
First embodiment
Referring to Fig. 1, the present embodiment provides a kind of inner-walls of duct detecting system, the system includes：Vector network analysis
Instrument apparatus 100, coaxial feed end cap device 110 and terminal short circuit end cap 120.The input of the coaxial feed end cap device 110
End is connected with the vector network analyzer device 100, and the output end of the coaxial feed end cap device 110 is used to be connected to treat
The one end in test tube road 200.The terminal short circuit end cap 120 is used for the other end for being connected to the pipe under test 200, so as to described
It is humorous that coaxial feed end cap device 110 and the terminal short circuit end cap 120 close off the two ends of the pipe under test 200 composition microwave
Shake chamber.
The pipe under test 200 can be metallic conduit.For example, the pipe under test 200 can be but be not limited to copper pipe
Road.Metallic conduit is considered as cylindrical waveguide, then microwave can carry out long range transmission inside metallic conduit and decay is smaller,
The remote detection of pipeline can be achieved.
The vector network analyzer device 100 is used to export microwave and by the microwave transmission to the coaxial feed end
Lid arrangement 110.Microwave can be the electromagnetic wave that frequency is 300MHz~300GHz, be the letter of a limited frequency band in radio wave
Claim.
The coaxial feed end cap device 110 is used in the microwave propagation to the pipe under test 200 that will receive,
And receive standing wave, the standing wave from the microwave along the part transmitted to the direction of terminal short circuit end cap 120 and via
The partial stack that the terminal short circuit end cap 120 is reflected back is formed.The edge to the direction of terminal short circuit end cap 120 be Fig. 1
The z directions of middle mark.Z directions that is to say the axial direction of pipe under test 200.The radial direction of pipe under test 200 is table in Fig. 1
The ρ directions shown.It is understood that pipe under test 200 can regard circular waveguide as, sagittal plane is using the center of circle of radial direction as original
Point, is intersected by x directions and with x directionsThe y directions composition of degree.
In the present embodiment, the standing wave is TM0nThe electromagnetic wave of pattern.
The standing wave that the coaxial feed end cap device 110 is additionally operable to receive is transmitted to vector network analyzer dress
Put 100.
The vector network analyzer device 100 is additionally operable to handle the standing wave to obtain in the pipe under test 200
Wall thickness situation.
As a kind of embodiment, vector network analyzer device 100 can include vector network analyzer 101 and with institute
State the computing terminal 102 of the electrical connection of vector network analyzer 101.The vector network analyzer 101 and the coaxial feed end
The input connection of lid arrangement 110.The computing terminal 102 can be the processor being integrated in vector network analyzer 101,
Can also be the terminal device with computing function, such as computer, panel computer, mobile phone.
The vector network analyzer 101 is used to export microwave and fill the microwave transmission to the coaxial feed end cap
Put 110.As a kind of embodiment, according to the size of pipe under test 200 such as internal diameter, length, suitable swept frequency range is chosen, i.e.,
The frequency range for the microwave that the vector network analyzer 101 is exported.In the present embodiment, the frequency range of microwave can be
13.99GHz~14.09GHz.
The vector network analyzer 101 is additionally operable to receive the standing wave that the coaxial feed end cap device 110 is transmitted.
It is first humorous that the vector network analyzer 101 is additionally operable to handle the standing wave to obtain the pipe under test 200
Vibration frequency.
The computing terminal 102 is used for the first resonant frequency for handling the pipe under test 200 got to obtain
State the inner wall thickness situation of pipe under test 200.
As a kind of embodiment, coaxial feed end cap device 110 can include antenna 111 and coaxial feed end cap 112.
The tip side 111a of the antenna 111 is connected with the vector network analyzer 101.Set on the coaxial feed end cap 112
There is through hole, it is preferable that the central spot on the coaxial feed end cap 112 sets through hole.The sending and receiving end of the antenna 111
111b is used to extend in the pipe under test 200 through the through hole.Preferably, the sending and receiving end 111b of the antenna 111 with
The diameter parallel of the pipe under test 200 or coincidence.The output end of the coaxial feed end cap 112 is described to be measured for being connected to
One end of pipeline 200, described test tube is treated so that the coaxial feed end cap 112 and the terminal short circuit end cap 120 are closed off
The two ends of road 200 constitute microwave cavity.
Enter a ground, the antenna 111 is used in the microwave propagation to the pipe under test 200 that will receive, and
Standing wave is received, the standing wave is from edge in the microwave to the part of the direction of terminal short circuit end cap 120 transmission and via the terminal
The partial stack that short-circuit end cap 120 is reflected back is formed.The antenna 111 is used to be launched in the microwave received, passes
Cast in the pipe under test 200.The standing wave that the antenna 111 is additionally operable to receive is transmitted to the vector network analyzer
101。
As a kind of embodiment, the tip side 111a of the antenna 111 passes through line with the vector network analyzer 101
Cable 103 is connected.Preferably, the antenna 111 can be coaxial antenna.The cable 103 can be coaxial cable.
As a kind of embodiment, the sending and receiving end 111b of the antenna 111 shell 111c and the coaxial feed end cap
112 input is electrically connected by conductive silver glue.
As a kind of embodiment, the output end of coaxial feed end cap 112 is used to being threadingly attached to described to treat test tube
The one end in road 200.The terminal short circuit end cap 120 is used for the other end for being threadingly attached to the pipe under test 200.It is preferred that
Ground, coaxial feed end cap 112, terminal short circuit end cap 120 can be made up of metal material.For example, coaxial feed end cap 112,
Terminal short circuit end cap 120 can be copper lid.
Fig. 1 and Fig. 2 are please referred to, for the microwave cavity, the change of resonant frequency etc. can pass through perturbation theory
Derive.Field amount before and after perturbation meets Maxwell equation and boundary condition respectively.
(a) in corresponding diagram 2, before perturbation, vorticity equation and boundary condition in maxwell equation group are：
an×E0=0 (3)
In (a), formula (1), (2), (3) in corresponding diagram 2, E0For microwave resonance cavity internal electric field amount, H before perturbation0To be micro-
Disturb magnetic field amount, ω in preceding microwave cavity body0For microwave resonance cavity interior resonance angular frequency before perturbation.anFor cavity inner wall surface
On unit normal vector, before and after perturbation, it is assumed that the electrical parameter of filled media, i.e. permittivity ε and magnetic permeability μ be not in cavity
Change.V0For the volume before perturbation in microwave cavity body, S0For the inner wall surface area before perturbation in microwave cavity body.
(b) in corresponding diagram 2, after perturbation, vorticity equation and boundary condition in maxwell equation group are：
an× E=0 (6)
In (b), formula (4), (5), (6) in corresponding diagram 2, E is microwave resonance cavity internal electric field amount after perturbation, and H is micro-
Magnetic field amount in rear microwave cavity body is disturbed, ω is microwave resonance cavity interior resonance angular frequency after perturbation.anFor cavity inner wall surface
On unit normal vector, before and after perturbation, it is assumed that the electrical parameter of filled media, i.e. permittivity ε and magnetic permeability μ be not in cavity
Change.Δ V is the perturbation volume of microwave resonance cavity, and Δ S is the perturbation surface area of microwave resonance cavity.
Pipe under test 200 occurs corrosion and the thinned phenomenon of duct wall occurs, and the export-oriented perturbation of cavity wall of resonator has：
V=V0+ΔV (7)
S=S0+ΔS (8)
Based on above formula, then the offset equation of microwave resonance cavity resonant frequency is before and after perturbation：
In formula (9), Δ f is the skew of resonant frequency after perturbation, f0For the resonant frequency before perturbation.
If swept frequency range is in TM01Mould and TM02Value between the cut-off frequency of mould, with reference to Fig. 1, in cylindrical-coordinate system, z
Direction that is to say the axial direction of pipe under test 200.The radial direction of pipe under test 200 is the ρ directions that represent in Fig. 1.Can be with
Understand, pipe under test 200 can regard circular waveguide as, and sagittal plane is using the center of circle of radial direction as origin, by x directions and and x
Direction is intersectedThe y directions composition of degree.With reference to the field component formula of permanent magnetic mould, TM in resonator01The electromagnetic field component table of mould
Have up to formula：
Bring above the Expressions of Higher-Order into formula (9) again, derived, obtain formula (10)：
In formula (10), l=l1+ld+l2, R is radius for the internal diameter of pipe under test 200, and l is the length of pipe under test 200
Degree, ldThe length being thinned for pipe under test 200, tdFor the thickness thinning of pipe under test 200.
Further, it is formula (11) to obtain the thinned equivalent volume of the inwall of pipe under test 200：
In formula (11), fcFor cut-off frequency, it corresponds to TM01The computing formula of mould is formula (12)：
In addition, the computing formula of resonant frequency is formula (13)：
As a kind of specific embodiment, referring to Fig. 3, pipe under test 200 includes pipe fitting 210 is not thinned and pipe is thinned
Part 220, l=l1+ld.The material of pipe under test 200 is copper, and the radius that pipe fitting 210 is not thinned is R=8.5mm, length l1=
450mm, wall thickness is 1mm.The length l of pipe fitting 220 is thinnedd=17mm, the thickness thinning that pipe fitting 220 is thinned is td, for the ease of dividing
Analysis, in the interval of [0,0.2mm] at interval of 0.05mm values once.
Set swept frequency range be：13.99GHz~14.09GHz, by pipeline thickness thinning tdIt is set to parametrization scanning point
Variable in analysis.Understood according to formula (13), as p=12, the first resonant frequency f0=14.043GHz is swept just at above-mentioned
In the range of frequency, therefore, the evaluation benchmark of the resonance frequency shift in the range of this is used as using the first resonant frequency 14.043GHz.This
Outside, calculated according to formula (12) and obtain cut-off frequency fc=13.51GHz.In Frequency sweep experiments, at the vector network analyzer 101
Manage the reflectance factor S that the standing wave obtains standing wave11, to obtain the second resonant frequency of the pipe under test 200, as shown in figure 4,
Abscissa is the first resonant frequency, and unit GHz, ordinate is reflectance factor S11, from right to left, it is followed successively by：A1 represents that 0mm subtracts
Thin, A2 represents that 0.05mm is thinned, and A3 represents that 0.1mm is thinned, and A4 represents that 0.15mm is thinned, and A5 represents that 0.2mm is thinned, it is known that：With
Thinned size tdIncrease, the second resonant frequency gradually reduces.
The calculated value of the offset of resonant frequency is obtained by formula (10), and the measured value of the skew of resonant frequency is by subtracting
Minimal thickness tdIn the case of certain, the second resonant frequency and the first resonance frequency f in difference corresponding diagram 40=14.043GHz difference
Obtain, calculated value, measured value and the thickness thinning t of the offset of resonant frequencydBetween relation it is as shown in Figure 5, it is seen that
The calculated value of the offset of resonant frequency is closer to measured value.
The thinned equivalent volume Δ V of inner-walls of duct is calculated according to the measured value of resonance frequency shift and using formula (11),
Obtain the data shown in Fig. 6, it is seen that measured value and actual value relatively, relative error between measured value and actual value compared with
It is small.
A kind of operation principle of inner-walls of duct detecting system provided in an embodiment of the present invention is as follows：
The vector network analyzer 101 output microwave and by the microwave transmission to the antenna 111.The antenna
111 by the microwave propagation received to the pipe under test 200, and receives standing wave, and the standing wave is by the microwave
Part that middle edge is transmitted to the direction of terminal short circuit end cap 120 and the partial stack being reflected back via the terminal short circuit end cap 120
Formed.The antenna 111 also transmits the standing wave received to the vector network analysis by the coaxial feed end cap 112
Instrument 101.The vector network analyzer 101 also receives the standing wave transmitted by the coaxial feed end cap device 110.Institute
Vector network analyzer 101 is stated also to handle the standing wave to obtain the first resonant frequency of the pipe under test 200.It is described to calculate
Terminal 102 handles the first resonant frequency of the pipe under test 200 got to obtain the interior wall thickness of the pipe under test 200
Degree situation.Transmitted over long distances in pipe under test 200 by microwave with this, form microwave cavity, realize pipe under test 200
Detect over long distances.
A kind of inner-walls of duct detecting system provided in an embodiment of the present invention, the system includes：Vector network analyzer is filled
Put 100, coaxial feed end cap device 110 and terminal short circuit end cap 120.The input of the coaxial feed end cap device 110 with
The vector network analyzer device 100 is connected, and the output end of the coaxial feed end cap device 110 is used to be connected to treat test tube
The one end in road 200.The terminal short circuit end cap 120 is used for the other end for being connected to the pipe under test 200, so as to described coaxial
Feed end cap device 110 and the terminal short circuit end cap 120 close off the two ends of pipe under test 200 and constitute microwave resonance
Chamber.The vector network analyzer device 100 is used to export microwave and fill the microwave transmission to the coaxial feed end cap
Put 110.The coaxial feed end cap device 110 is used in the microwave propagation to the pipe under test 200 that will receive, with
And standing wave is received, the standing wave is from edge in the microwave to the part of the direction of terminal short circuit end cap 120 transmission and via institute
The partial stack that terminal short circuit end cap 120 is reflected back is stated to be formed.The coaxial feed end cap device 110 is additionally operable to receive
Standing wave is transmitted to the vector network analyzer device 100.The vector network analyzer device 100 is additionally operable to stay described in processing
Ripple is to obtain the inner wall thickness situation of the pipe under test 200.Transmitted over long distances in pipe under test 200 by microwave with this,
Microwave cavity is formed, the long range detection of pipe under test 200 is realized.
Second embodiment
Referring to Fig. 7, the embodiments of the invention provide a kind of inner-walls of duct detection method, applied to above-mentioned system, institute
The method of stating includes：
Step S300：Vector network analyzer device output microwave and by the microwave transmission to the coaxial feed
End cap device；
Step S310：The coaxial feed end cap device by the microwave propagation received to the pipe under test,
And standing wave is received, the standing wave is from edge in the microwave to the part of terminal short circuit end cap direction transmission and via described
The partial stack that terminal short circuit end cap is reflected back is formed；
Step S320：The coaxial feed end cap device also transmits the standing wave received to the vector network analyzer
Device；
Step S330：The vector network analyzer device also handles the standing wave to obtain the inwall of the pipe under test
Thickness situation.
As a kind of embodiment, based on step S330, step S330 can include sub-step S331, sub-step S332,
Sub-step S333, sub-step S334.
Sub-step S331：The internal diameter of the pipe under test of the vector network analyzer device based on acquisition, length with
And first preset rules, obtain the first resonant frequency of the pipe under test；
Further, it is based onTest tube is treated described in obtaining
First resonant frequency in road；Wherein, f0For the first resonant frequency of the pipe under test, R is the internal diameter of the pipe under test, l
For the length of the pipe under test, μ is the first preset constant, and ε is the second preset constant.It is understood that first embodiment
In formula (13) be first preset rules.The electrical parameter of filled media in resonator cavity, ε is electric constant ε and μ
As magnetic permeability μ.
Sub-step S332：The second resonant frequency of the pipe under test is obtained according to the standing wave got；
The vector network analyzer 101 handles the reflectance factor S that the standing wave obtains standing wave11, it is described to be measured to obtain
Second resonant frequency of pipeline.
Sub-step S333：First resonant frequency and second resonant frequency are contrasted, obtains humorous according to comparing result
The offset of vibration frequency；
The difference of first resonant frequency and second resonant frequency, is used as the offset of resonant frequency.
Sub-step S334：The offset of internal diameter, length, the resonant frequency based on the pipe under test got with
And second preset rules, the thinned equivalent volume of the pipe under test inwall is obtained, to obtain the interior wall thickness of the pipe under test
Degree situation.
Further, it is based onThe thinned equivalent volume of the pipe under test inwall is obtained, wherein,
Δ V is the equivalent volume that the pipe under test inwall is thinned, f0For the first resonant frequency of the pipe under test, Δ f is described
The offset of resonant frequency, R is the internal diameter of the pipe under test, and l is the length of the pipe under test,μ is
First preset constant, ε is the second preset constant.It is understood that the formula (11) in first embodiment is second default
Rule.
It is apparent to those skilled in the art that, for convenience and simplicity of description, the method for foregoing description
Specific work process, may be referred to the corresponding process in aforementioned system embodiment, will not be repeated here.
A kind of inner-walls of duct detection method provided in an embodiment of the present invention, is exported by the vector network analyzer device
Microwave and by the microwave transmission to the coaxial feed end cap device；Described in the coaxial feed end cap device will be received
In microwave propagation to the pipe under test, and receive standing wave, the standing wave from the microwave along to the terminal short circuit end
The part of lid direction transmission and the partial stack being reflected back via the terminal short circuit end cap are formed；The coaxial feed end cap dress
Put and also transmit the standing wave received to the vector network analyzer device；The vector network analyzer device also handles institute
Standing wave is stated to obtain the inner wall thickness situation of the pipe under test.Transmitted over long distances in pipe under test by microwave with this, shape
Into microwave cavity, the long range detection of pipe under test is realized.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (10)
1. a kind of inner-walls of duct detecting system, it is characterised in that the system includes：Vector network analyzer device, coaxial feed
Electric end cap device and terminal short circuit end cap, the input of the coaxial feed end cap device and the vector network analyzer device
Connection, the output end of the coaxial feed end cap device is used for the one end for being connected to pipe under test, and the terminal short circuit end cap is used
In the other end for being connected to the pipe under test, so that the coaxial feed end cap device and the terminal short circuit end cap are sealed respectively
Close the pipe under test two ends and constitute microwave cavity；
The vector network analyzer device is used to export microwave and by the microwave transmission to the coaxial feed end cap device；
The coaxial feed end cap device is used in the microwave propagation to the pipe under test that will receive, and receives and stay
Ripple, the standing wave is from edge in the microwave to the part of terminal short circuit end cap direction transmission and via the terminal short circuit end
The partial stack being reflected back is covered to be formed；
The standing wave that the coaxial feed end cap device is additionally operable to receive is transmitted to the vector network analyzer device；
The vector network analyzer device is additionally operable to handle the standing wave to obtain the inner wall thickness situation of the pipe under test.
2. system according to claim 1, it is characterised in that the vector network analyzer device includes vector network point
Analyzer and the computing terminal electrically connected with the vector network analyzer, the vector network analyzer and the coaxial feed end
Lid arrangement is connected；
The vector network analyzer is used to export microwave and by the microwave transmission to the coaxial feed end cap device；
The vector network analyzer is additionally operable to handle the standing wave to obtain the first resonant frequency of the pipe under test；
The computing terminal is used to handle the first resonant frequency of the pipe under test got to obtain the pipe under test
Inner wall thickness situation.
3. system according to claim 2, it is characterised in that the coaxial feed end cap device includes antenna and coaxial feed
Electric end cap, the tip side of the antenna is connected with the vector network analyzer, and through hole is provided with the coaxial feed end cap,
The sending and receiving end of the antenna is used to extend in the pipe under test through the through hole, the output end of the coaxial feed end cap
One end for being connected to the pipe under test, so that the coaxial feed end cap and the terminal short circuit end cap close off institute
State pipe under test two ends and constitute microwave cavity；
The antenna is used in the microwave propagation to the pipe under test that will receive, and receives standing wave, the standing wave
From in the microwave along the part transmitted to terminal short circuit end cap direction and the part being reflected back via the terminal short circuit end cap
Superposition is formed；
The standing wave that the antenna is additionally operable to receive is transmitted to the vector network analyzer.
4. system according to claim 3, it is characterised in that the tip side of the antenna and the vector network analyzer
Connected by cable, the input of the shell of the sending and receiving end of the antenna and the coaxial feed end cap is electrically connected by conductive silver glue
Connect.
5. system according to claim 4, it is characterised in that the antenna is coaxial antenna, the cable is coaxial line
Cable.
6. system according to claim 3, it is characterised in that the output end of the coaxial feed end cap is used to pass through screw thread
One end of the pipe under test is connected to, the terminal short circuit end cap is used to be threadingly attached to the another of the pipe under test
End.
7. a kind of inner-walls of duct detection method, it is characterised in that applied to the system as described in claim any one of 1-6, institute
The system of stating includes：Vector network analyzer device, coaxial feed end cap device and terminal short circuit end cap, the coaxial feed end cap
The input of device is connected with the vector network analyzer device, and the output end of the coaxial feed end cap device is used to connect
In one end of pipe under test, the terminal short circuit end cap is used for the other end for being connected to the pipe under test, so as to described coaxial
Feed end cap device and the terminal short circuit end cap close off the pipe under test two ends and constitute microwave cavity；Methods described
Including：
Vector network analyzer device output microwave and by the microwave transmission to the coaxial feed end cap device；
The coaxial feed end cap device is by the microwave propagation received to the pipe under test, and receives standing wave,
The standing wave is from edge in the microwave to the part of terminal short circuit end cap direction transmission and via the terminal short circuit end cap
The partial stack being reflected back is formed；
The coaxial feed end cap device also transmits the standing wave received to the vector network analyzer device；
The vector network analyzer device also handles the standing wave to obtain the inner wall thickness situation of the pipe under test.
8. method according to claim 7, it is characterised in that the vector network analyzer device also handles the standing wave
To obtain the inner wall thickness situation of the pipe under test, including：
Internal diameter, length and the first preset rules of the pipe under test of the vector network analyzer device based on acquisition,
Obtain the first resonant frequency of the pipe under test；
The second resonant frequency of the pipe under test is obtained according to the standing wave got；
First resonant frequency and second resonant frequency are contrasted, the offset of resonant frequency is obtained according to comparing result；
Internal diameter, length, the offset of the resonant frequency and the second preset rules based on the pipe under test got,
The thinned equivalent volume of the pipe under test inwall is obtained, to obtain the inner wall thickness situation of the pipe under test.
9. method according to claim 8, it is characterised in that the internal diameter based on the pipe under test got,
Length and the first preset rules, obtain the first resonant frequency of the pipe under test, including：
It is based onObtain the first resonance of the pipe under test frequently
Rate；Wherein, f0For the first resonant frequency of the pipe under test, R is the internal diameter of the pipe under test, and l is the pipe under test
Length, μ be the first preset constant, ε be the second preset constant.
10. method according to claim 9, it is characterised in that the internal diameter based on the pipe under test got,
Length, the offset of the resonant frequency and the second preset rules, obtain the thinned equivalent volume of the pipe under test inwall,
Including：
It is based onThe thinned equivalent volume of the pipe under test inwall is obtained, wherein, Δ V is described to be measured
The thinned equivalent volume of inner-walls of duct, f0For the first resonant frequency of the pipe under test, Δ f is the skew of the resonant frequency
Amount, R is the internal diameter of the pipe under test, and l is the length of the pipe under test,μ is the first preset constant, ε
For the second preset constant.
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| CN201710342600.XA CN106949860B (en) | 2017-05-15 | 2017-05-15 | Inner wall of the pipe detection system and method |
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| CN113962122A (en) * | 2021-09-30 | 2022-01-21 | 北京智芯仿真科技有限公司 | Method and system for determining full-wave electromagnetic simulation low-frequency reference frequency point of integrated circuit |
| US20220228900A1 (en) * | 2021-01-18 | 2022-07-21 | Rosemount Tank Radar Ab | Waveguide for a radar level gauge |
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