CN106908456A - The microwave detection probe and method of a kind of metal sheet surface defects detection and positioning - Google Patents
The microwave detection probe and method of a kind of metal sheet surface defects detection and positioning Download PDFInfo
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- CN106908456A CN106908456A CN201710079641.4A CN201710079641A CN106908456A CN 106908456 A CN106908456 A CN 106908456A CN 201710079641 A CN201710079641 A CN 201710079641A CN 106908456 A CN106908456 A CN 106908456A
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N22/00—Investigating or analysing materials by the use of microwaves or radio waves, i.e. electromagnetic waves with a wavelength of one millimetre or more
- G01N22/02—Investigating the presence of flaws
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Abstract
The invention discloses a kind of metal sheet surface defects detection and the microwave detection probe and method of positioning, belong to technical field of nondestructive testing；Microwave detection probe is made up of the equal cuboid metal cell type metal cap without bottom surface in base supercentral two coaxial radio-frequency connectors in two sides adjacent with probe metal cap is separately fixed at；This method principle is that microwave probe and metal sheet to be measured are constituted into rectangular waveguide, microwave is propagated in rectangular waveguide, there is electric current in rectangular waveguide inner wall surface, when metal sheet existing defects, hinder the flowing of waveguide inner wall surface electric current, microwave in influence waveguide cavity, the microwave signal for detecting carries the information relevant with defective locations；During detection, microwave is propagated in the rectangular waveguide that microwave detection probe and metal sheet to be measured are constituted, and improves detection efficiency and sensitivity, while having filled up the blank that microwave detection probe cannot be used for metal sheet surface defect positioning.
Description
Technical field
The invention belongs to technical field of nondestructive testing, and in particular to one kind is applied to metal sheet surface defect efficient detection
With the microwave detection probe and corresponding defect positioning method of positioning.
Background technology
Metal sheet is widely used in the middle of the production and living of the mankind, especially in some cores and the mechanical structure of key
In.Airframe is the recurrent place of defect.From the point of view of early detection angle, the defect inspection to early stage metal sheet surface
Survey is necessary.Conventional eddy current detection method needs point by point scanning, there is requirement very high, cost to manpower and financial resources
Greatly.The inefficiencies such as other lossless detection methods, such as leakage method, infrared thermography, ultrasound detection needs couplant ratio
It is cumbersome.Microwave detection penetrates the characteristics such as dielectric material with detection object is not contacted.This causes microwave on metal sheet surface
There is unique advantage in defects detection.
Although scholars have begun to the research of microwave detection early in 20 century 70s.But until in recent years, just occur
The research of near-field detection is carried out using the rectangular waveguide with metal flange.Recently, started a burst of using open coaxial sensing
Device microwave probe detects the research boom of crackle, and this sensor sensitivity is high, or even can detect closure crackle.Researcher is not
Near-field detection metal sheet surface defect is only applied it to, far field pipeline crack, trommel, microorganism is also applied it to
In the detection of identification, positioning and qualitative assessment.Regard pipeline as circular waveguide, to launching microwave signal in circular waveguide,
There is electric current in circular waveguide inner wall surface.When defect occurs in pipeline, defect hinders waveguide inner wall surface electric current flowing, waveguide
The change of inside pipe wall electric current causes the change of the electromagnetic wave in pipeline, and the electromagnetic wave signal that probe is received carries relevant with defect
Information.Because microwave can in the waveguide transmit a segment distance very long, and it is less to decay.Therefore the above method can be on a large scale
Ground detection metallic conduit defect in inner surface.
The content of the invention
In order to improve microwave detect metal sheet efficiency, the present invention propose a kind of metal sheet surface defects detection and
The microwave detection probe and method of positioning, can realize the detection of metal sheet surface defect and determine using the microwave detection probe
Position, in view of the country is not perfect to microwave detection metal sheet surface defect method, the present invention proposes microwave detection probe tool very
Strong practicality and engineering application value higher.
In order to achieve the above object, the present invention is adopted the following technical scheme that：
A kind of metal sheet surface defects detection and positioning microwave detection probe, including base it is equal for l, highly for h,
The metal cap 1 of the cuboid metal cell type without bottom surface, wherein 0<H≤l, it is fixed on two of the adjacent two sides of probe metal cap 1
The corresponding first radio frequency (RF) coaxial connector T and y directions of identical radio frequency (RF) coaxial connector, respectively x directions corresponding second are penetrated
Frequency coaxial connector D.
The probe metal cap 1 is to be not less than 4.10 × 10 by electrical conductivity7The metal material of S/m makes.
Gold-plated or silver on the probe inwall of metal cap 1.
Two identical radio frequency (RF) coaxial connectors are fixed respectively in two adjacent l × h center sides of probe metal cap 1.
The first radio frequency (RF) coaxial connector T and the second radio frequency (RF) coaxial connector D are that mother turns public connector, and male is in probe
The inner side of metal cap 1, female in the outside of probe metal cap 1, for connecting coaxial cable.
The microwave detection probe disposably detects that metal sheet region is l × l.
The design of metal cap causes that microwave signal concentrates on microwave detection probe and metallic plate to be measured in detection on probe
Propagated in the rectangular waveguide of part composition, improve detection efficiency and sensitivity.
The method that described microwave detection probe carries out metal sheet surface defects detection and positioning, comprises the following steps that：
1) experimental system is built, microwave vector network analyzer and coaxial cable one end connect, and coaxial cable is another
End is connected with the first radio frequency (RF) coaxial connector T and the second radio frequency (RF) coaxial connector D；Microwave detection probe is fixed on probe bracket
On, probe bracket can be in three direction movements of x, y, z；In order to eliminate influence of the instrument to measurement result, it is right to be needed before measurement
Instrument carries out electric calibration, it is ensured that two radio frequency (RF) coaxial connector males in microwave detection probe are zero reference level；In standard gold
On category plate, group velocity calibration is carried out to microwave detection probe；
2) to position (X, Y), detection zone is [X-l/2, X+l/2] × [Y-l/2, Y+l/2] to mobile probe support；In z
Mobile probe support on direction, metal sheet surface is close to by microwave detection probe, so pop one's head in metal cap 1 and metal to be measured
Plate constitutes rectangular waveguide；
3) microwave vector network analyzer is connected by the first RF coaxial in coaxial cable and microwave detection probe
Device T provides microwave signal to microwave detection probe, microwave is propagated in the x-direction in probe, and microwave vector network analyzer exists
The microwave signal of reflection is detected in first radio frequency (RF) coaxial connector T；
4) by inverse-Fourier transform, time-domain signal is calculated；If time-domain signal is produced in rectangular waveguide tube terminal
Reflection peak TendDo not existed obvious reflection at peak, mobile probe to next test position, repeat step 2 before moment) -4), after
The detection of continuous metal sheet surface defect, until completing the detection in all regions to be detected；If in microwave terminal reflection peak TendWhen
There is obvious reflection at peak before quarter, the relative abscissa x of defect is determined using the group velocity after calibrationr；
5) microwave vector network analyzer is connected by the second RF coaxial in coaxial cable and microwave detection probe
Device D provides microwave signal to microwave detection probe, microwave is propagated in the y-direction in probe, in the second radio frequency (RF) coaxial connector D
The microwave signal of middle detection reflection；
6) by inverse-Fourier transform, time-domain signal is calculated；Observation time-domain signal is produced in rectangular waveguide tube terminal
Reflection peak TendNotable crest before moment, the relative ordinate y of defect is determined by this notable crest momentr；
7) using formula x=X+xr- l/2, y=Y+yr- l/2 is calculated, final to determine that defect is upper in tested metal plate
Put.
During detection, for the suitable dominant pattern microwave of set direction of detection defect, wherein, TE ripple dominant pattern microwaves
Detection is high parallel to the flaw sensitivity in microwave transmission direction, and TM ripple dominant patterns microwave is detected perpendicular to microwave transmission direction
Flaw sensitivity is high.
Size and dominant pattern microwave, detection sensitivity according to microwave detection probe determine the frequency range of detection ripple,
The frequency range of detection ripple is controlled by microwave vector network analyzer.
Compared to the prior art, the invention has the advantages that：
Microwave is all limited in the microwave detection probe of the present invention design metal cap and metallic plate to be measured using metal cap
In the rectangular waveguide of part composition, microwave is set to be propagated in rectangular waveguide.Microwave is constituted in metal cap and metal sheet to be measured
Rectangular waveguide transmit when, microwave is propagated in rectangular waveguide tube chamber, and rectangular waveguide inner wall surface has electric current, so inspection
The microwave signal for measuring carries the information relevant with metal sheet surface defect.With the probe phase that traditional microwave detects metal
Than, such as coaxial probe, the rectangular waveguide probe with metal flange, the open Coaxial line sensor with metal flange are popped one's head in, this
Plant the square waves that the propagation of microwave has all been concentrated on closed probe high conductivity metal cover and metal sheet to be measured composition
In conduit, detection efficiency and sensitivity are improve.The microwave detection probe simple structure, detection object is wide, and it is convenient to detect, detection
Efficiency high, accuracy of detection is high.When microwave detection probe is to the detection of metal sheet, as long as allowing microwave detection probe to be close to metal
Plate needs the surface of detection zone, it is possible to carry out defects detection.The microwave detection probe can be to the non-porous of arbitrary shape
The surface defects detection and positioning of the planar metal plate in hole.During detection, it is only necessary to keep metal sheet surface cleaning to be detected,
Microwave detection probe is close on metal sheet, microwave vector network analyzer is connected by coaxial cable and coaxial radio-frequency
Signal is launched and received to device, you can realizes the detection to metal sheet surface defect and positioning.Examined using this new microwave
Probing head detection, disposable detection planar metal plate region area is l × l.During detection, microwave concentrates on microwave detection probe
Propagated in the rectangular waveguide constituted with metal sheet to be measured, with detection efficiency higher and sensitivity.
Brief description of the drawings
Fig. 1 is the stereogram of microwave detection probe.
Fig. 2 is the front sectional view of microwave detection probe.
Fig. 3 is the left view sectional view of microwave detection probe.
Fig. 4 is microwave detection probe vertical view cutaway drawing.
Fig. 5 is microwave detection probe front side front elevation views.
Fig. 6 is microwave detection probe leading flank rearview.
Fig. 7 is microwave detection probe right flank right view.
Fig. 8 is microwave detection probe right flank left view.
Fig. 9 is the microwave detection probe of autonomous Design to metal sheet surface defects detection and positioning schematic diagram.
Figure 10 is schematic diagram of the microwave detection probe in metal sheet surface movement detection defect.
Specific embodiment
Present disclosure is described in further detail below in conjunction with the accompanying drawings.
The design and detection method of microwave detection probe：
As shown in figures 1-8, what the present invention was designed is not less than 4.10 × 10 in electrical conductivity7The metal that S/m metal materials make
1 (shape of metal cap 1 is the equal cuboid metal cell type without bottom surface in base) of cover fixes two on two adjacent l × h sides
A kind of new microwave detection probe of radio frequency (RF) coaxial connector.Probe metal cap 1 is not less than 4.10 × 10 by electrical conductivity7S/
The metal material of m is made, and because microwave is in waveguide transmissions, microwave is propagated in the waveguide, and waveguide inner wall surface is present
Electric current, it is substantially unrelated with waveguide bulk material, can so reduce microwave transmission in gold-plated or silver on the inwall of metal cap 1 of popping one's head in
During loss.Inwall is gold-plated or shape of silver metal cover is the equal cuboid metal cell type without bottom surface in base, metal cap
L long, width l, h high (0<h≤l).Two identical RF coaxials are fixed respectively in two adjacent l × h center sides of metal cap 1
Connector, respectively the first radio frequency (RF) coaxial connector T and the second radio frequency (RF) coaxial connector D.This two radio frequency (RF) coaxial connectors are
Mother turns public connector, and, in the inner side of probe metal cap 1, female is in the outside of probe metal cap 1 for their male.
Experimental system is built, as shown in figure 9, the experimental system of the microwave detection probe application of present invention design is sweared by microwave
Amount Network Analyzer 4, the first coaxial cable 2, the second coaxial cable 3, microwave detection probe and probe bracket composition.Microwave
The one end of 4 and first coaxial cable of vector network analyzer 2 connects, and on the other end of the first coaxial cable 2 and metal cap 1 the
One radio frequency (RF) coaxial connector T is connected, meanwhile, the connection of the one end of 4 and second coaxial cable of microwave vector network analyzer 3, second
The other end of coaxial cable 3 is connected with the first radio frequency (RF) coaxial connector D on metal cap 1.The L long of metal sheet, width W, H high.
Microwave detection probe is fixed on probe bracket, and probe bracket can be in three direction movements of x, y, z.During detection metal sheet,
As shown in Figure 10, to (X, Y), region to be detected is [X-l/2, X+l/2] × [Y-l/2, Y+l/2] to mobile probe support.In z side
Probe bracket is moved up, microwave detection probe is close to metal sheet surface, such metal cap and metal sheet structure to be measured
Rectangular waveguide.
Microwave vector network analyzer is detected to microwave respectively by coaxial cable and radio frequency (RF) coaxial connector (T or D)
Microwave signal is provided in probe, microwave is propagated along specific direction in probe：When microwave vector network analyzer is by coaxial
When cable and the first radio frequency (RF) coaxial connector T provide microwave signal to microwave detection probe, microwave is passed in probe along x directions
Broadcast；When microwave vector network analyzer provides micro- by coaxial cable and the second radio frequency (RF) coaxial connector D to microwave detection probe
During ripple signal, microwave is propagated in probe along y directions.First radio frequency (RF) coaxial connector T's and the second radio frequency (RF) coaxial connector D
Male is internal in probe, the propagation of microwave in probe is more concentrated.Meanwhile, microwave vector network analyzer passes through coaxial cable
Reflection wave signal is detected with the same radio frequency (RF) coaxial connector in microwave detection probe.When metal sheet existing defects, hinder
The flowing of waveguide inner wall surface electric current.The change of waveguide inner wall surface electric current causes the change of the microwave transmitted in waveguide cavity
Change, the reflection wave signal that microwave vector network analyzer is detected in radio frequency (RF) coaxial connector carries relevant with defective locations
Information.By inverse-Fourier transform, time-domain signal is calculated.The reflection that observation time-domain signal is produced in rectangular waveguide tube terminal
Peak TendThe notable crest that whether there is before moment.If in the presence of such notable crest, determining to lack by this notable crest moment
Sunken position.
Direction of check for detection selects corresponding dominant pattern microwave, TE ripple dominant patterns microwave to detect parallel to micro-
The flaw sensitivity of ripple transmission direction is high；TM ripple dominant patterns microwave detects the flaw sensitivity perpendicular to microwave transmission direction
It is high.Size and dominant pattern microwave, detection sensitivity (order of magnitude with flaw size is relevant) according to microwave detection probe are really
Regular inspection surveys the frequency range of ripple.According to formulaDetermine the cut-off frequency of microwave, wherein c is true
The aerial light velocity, a, b are side long and the short side of rectangular waveguide, m, n be not all zero natural number.
During specific detection, first, microwave vector network analyzer is by the in coaxial cable and microwave detection probe
One radio frequency (RF) coaxial connector T provides signal to probe, microwave is propagated along x directions in probe.Meanwhile, microwave vector network
Analyzer detects the microwave signal of reflection by the first radio frequency (RF) coaxial connector T in coaxial cable and microwave detection probe.
By inverse-Fourier transform, time-domain signal is calculated.The reflection peak T that observation time-domain signal is produced in rectangular waveguide tube terminalend
The notable crest that whether there is before moment.If in the presence of such notable crest, defect is determined by this notable crest moment
With respect to abscissa.Otherwise, mobile probe support continues to detect to next test position, until completing all regions to be detected
Detection.Secondly, microwave vector network analyzer is connected by the second RF coaxial in coaxial cable and microwave detection probe
Meet device D and provide microwave signal to microwave detection probe, microwave is propagated along y directions in probe.Meanwhile, microwave vector network
Analyzer detects the microwave signal of reflection by the second radio frequency (RF) coaxial connector D in coaxial cable and microwave detection probe,
By inverse-Fourier transform, time-domain signal is calculated.The reflection peak T that observation time-domain signal is produced in rectangular waveguide tube terminalend
Notable crest before moment, the relative ordinate of defect is determined by this notable crest moment.
1) such as Fig. 1-8, microwave detection probe is designed and produced, mainly includes high conductivity probe metal cap 1, and it is solid respectively
Two radio frequency (RF) coaxial connectors on two adjacent l × h center sides of probe metal cap 1 are scheduled on, respectively the first radio frequency is same
Mandrel connector T and the second radio frequency (RF) coaxial connector D.
2) many places defect is made on metal sheet.
3) experimental system is mainly by microwave vector network analyzer, coaxial cable, microwave detection probe, and probe bracket
Composition.Build experimental system, such as Fig. 9, the connection of the one end of 4 first coaxial cable of microwave vector network analyzer 2, the first coaxial line
The other end of cable 2 is connected with the first radio frequency (RF) coaxial connector T on metal cap 1, meanwhile, microwave vector network analyzer 4 and
The one end of two coaxial cable 3 connects, and the other end of the second coaxial cable 3 connects with the first radio frequency (RF) coaxial connector D on metal cap 1
Connect.Microwave detection probe is fixed on probe bracket, and probe bracket can be moved up in three sides of x, y, z.
4) in order to eliminate influence of the instrument to measurement result, need to carry out electric calibration to instrument before measurement, it is ensured that microwave is examined
Two radio frequency (RF) coaxial connector males on probing head are zero reference level.
5) on standard metal plate, group velocity calibration is carried out to microwave detection probe.
6) in metal sheet region mobile probe support to be detected, defect is detected, determines defective locations.
Detection defect and defect location are comprised the following steps that：
1) to position (X, Y), detection zone is [X-l/2, X+l/2] × [Y-l/2, Y+l/2] to mobile probe support.In z
Mobile probe support on direction, metal sheet surface is close to by microwave detection probe.
2) microwave vector network analyzer is connected by the first RF coaxial in coaxial cable and microwave detection probe
Device T provides signal to microwave detection probe, microwave is propagated along x directions in probe.Microwave vector network analyzer is
The microwave signal of reflection is detected in one radio frequency (RF) coaxial connector T.
3) by inverse-Fourier transform, time-domain signal is calculated.If time-domain signal is produced in rectangular waveguide tube terminal
Reflection peak TendDo not existed obvious reflection at peak, mobile probe to next test position, repeat step 1 before moment) -3), after
The detection of continuous metal sheet surface defect, until completing the detection in all regions to be detected.If in rectangular waveguide end reflection
Peak TendThere is obvious reflection at peak before moment, the relative abscissa x of defect is determined using the group velocity after calibrationr。
4) microwave vector network analyzer is connected by the second RF coaxial in coaxial cable and microwave detection probe
Device D provides microwave signal to microwave detection probe, microwave is propagated along y directions in probe.Microwave vector network analyzer
The microwave signal of reflection is detected in the second radio frequency (RF) coaxial connector D.
5) by inverse-Fourier transform, time-domain signal is calculated.Observation time-domain signal is produced in rectangular waveguide tube terminal
Reflection peak TendNotable crest before moment, the relative ordinate y of defect is determined by this notable crest momentr。
6) using formula x=X+xr- l/2, y=Y+yr- l/2 is calculated, final to determine that defect is upper in tested metal plate
Put.
Claims (10)
1. a kind of metal sheet surface defects detection and positioning microwave detection probe, it is characterised in that：It is equal including base to be
L, highly be h, the metal cap (1) of the cuboid metal cell type without bottom surface, wherein 0<H≤l, is fixed on probe metal cap (1) phase
Two identical radio frequency (RF) coaxial connectors of adjacent two sides, the respectively corresponding first radio frequency (RF) coaxial connector T in x directions and y side
To corresponding second radio frequency (RF) coaxial connector D.
2. a kind of metal sheet surface defects detection according to claim 1 and positioning microwave detection probe, its feature
It is：Probe metal cap (1) is to be not less than 4.10 × 10 by electrical conductivity7The metal material of S/m makes.
3. a kind of metal sheet surface defects detection according to claim 1 and positioning microwave detection probe, its feature
It is：Gold-plated or silver on described probe metal cap (1) inwall.
4. a kind of metal sheet surface defects detection according to claim 1 and positioning microwave detection probe, its feature
It is：Two identical radio frequency (RF) coaxial connectors are fixed respectively in two adjacent l × h center sides of probe metal cap (1).
5. a kind of metal sheet surface defects detection according to claim 1 and positioning microwave detection probe, its feature
It is：First radio frequency (RF) coaxial connector (T) and the second radio frequency (RF) coaxial connector (D) are that mother turns public connector, and male is being visited
Head metal cap (1) inner side, female probe metal cap (1) outside, for connecting coaxial cable.
6. a kind of metal sheet surface defects detection according to claim 1 and positioning microwave detection probe, its feature
It is：The microwave detection probe disposably detects that metal sheet region is l × l.
7. a kind of metal sheet surface defects detection according to claim 1 and positioning microwave detection probe, its feature
It is：The design of metal cap causes that microwave signal concentrates on microwave detection probe and metal sheet to be measured in detection on probe
Propagated in the rectangular waveguide of composition, improve detection efficiency and sensitivity.
8. the microwave detection probe described in any one of claim 1 to 7 carries out the side of metal sheet surface defects detection and positioning
Method, it is characterised in that：
Detection defect and defect location are comprised the following steps that：
1) build experimental system, microwave vector network analyzer and coaxial cable one end connect, the coaxial cable other end with
First radio frequency (RF) coaxial connector (T) and the second radio frequency (RF) coaxial connector (D) are connected；Microwave detection probe is fixed on probe bracket
On, probe bracket can be in three direction movements of x, y, z；In order to eliminate influence of the instrument to measurement result, it is right to be needed before measurement
Instrument carries out electric calibration, it is ensured that two radio frequency (RF) coaxial connector males in microwave detection probe are zero reference level；In standard gold
On category plate, group velocity calibration is carried out to microwave detection probe；
2) to position (X, Y), detection zone is [X-l/2, X+l/2] × [Y-l/2, Y+l/2] to mobile probe support；In z directions
Upper mobile probe support, metal sheet surface is close to by microwave detection probe, so pop one's head in metal cap (1) and metallic plate to be measured
Part constitutes rectangular waveguide；
3) microwave vector network analyzer is by the first radio frequency (RF) coaxial connector (T) in coaxial cable and microwave detection probe
Microwave signal is provided to microwave detection probe, microwave is propagated in the x-direction in probe, microwave vector network analyzer is first
The microwave signal of detection reflection in radio frequency (RF) coaxial connector (T)；
4) by inverse-Fourier transform, time-domain signal is calculated；If the reflection that time-domain signal is produced in rectangular waveguide tube terminal
Peak TendDo not existed obvious reflection at peak, mobile probe to next test position, repeat step 2 before moment) -4), continue gold
Belong to the detection of plate surface defect, until completing the detection in all regions to be detected；If in microwave terminal reflection peak TendBefore moment
In the presence of obvious reflection at peak, the relative abscissa x of defect is determined using the group velocity after calibrationr；
5) microwave vector network analyzer is by the second radio frequency (RF) coaxial connector (D) in coaxial cable and microwave detection probe
Microwave signal is provided to microwave detection probe, microwave is propagated in the y-direction in probe, at the second radio frequency (RF) coaxial connector (D)
The microwave signal of middle detection reflection；
6) by inverse-Fourier transform, time-domain signal is calculated；Observation time-domain signal rectangular waveguide tube terminal produce it is anti-
Penetrate peak TendNotable crest before moment, the relative ordinate y of defect is determined by this notable crest momentr；
7) using formula x=X+xr- l/2, y=Y+yr- l/2 is calculated, final to determine defect position on tested metal plate.
9. method according to claim 8, it is characterised in that：During detection, the set direction for detection defect is suitable
Dominant pattern microwave, wherein, TE ripple dominant patterns microwave detects, TM ripple master high parallel to the flaw sensitivity in microwave transmission direction
Guided mode type micro-wave detects that the flaw sensitivity perpendicular to microwave transmission direction is high.
10. method according to claim 8, it is characterised in that：Size and dominant pattern according to microwave detection probe is micro-
Ripple, detection sensitivity determine the frequency range of detection ripple, and the frequency range of detection ripple is controlled by microwave vector network analyzer.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108375590A (en) * | 2018-01-19 | 2018-08-07 | 西安交通大学 | The online lossless detection method of universal joint surface casting flaw |
| CN111060214A (en) * | 2019-12-24 | 2020-04-24 | 上海传输线研究所（中国电子科技集团公司第二十三研究所） | Fiber grating temperature measurement sensor and temperature measurement method of inner conductor of radio frequency cable |
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| US6363605B1 (en) * | 1999-11-03 | 2002-04-02 | Yi-Chi Shih | Method for fabricating a plurality of non-symmetrical waveguide probes |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108375590A (en) * | 2018-01-19 | 2018-08-07 | 西安交通大学 | The online lossless detection method of universal joint surface casting flaw |
| CN111060214A (en) * | 2019-12-24 | 2020-04-24 | 上海传输线研究所（中国电子科技集团公司第二十三研究所） | Fiber grating temperature measurement sensor and temperature measurement method of inner conductor of radio frequency cable |
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|---|---|
| CN106908456B (en) | 2018-04-17 |
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