CN108548718A - Crack Propagation monitoring system based on microstrip antenna sensor and its monitoring method - Google Patents
Crack Propagation monitoring system based on microstrip antenna sensor and its monitoring method Download PDFInfo
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- CN108548718A CN108548718A CN201810480609.1A CN201810480609A CN108548718A CN 108548718 A CN108548718 A CN 108548718A CN 201810480609 A CN201810480609 A CN 201810480609A CN 108548718 A CN108548718 A CN 108548718A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/06—Special adaptations of indicating or recording means
- G01N3/066—Special adaptations of indicating or recording means with electrical indicating or recording means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0005—Repeated or cyclic
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0073—Fatigue
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/0617—Electrical or magnetic indicating, recording or sensing means
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- Life Sciences & Earth Sciences (AREA)
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a kind of crack Propagation monitoring system and its monitoring method based on microstrip antenna sensor, wherein system includes microstrip antenna sensor, wireless interrogation device and data acquisition and processing unit；The microstrip antenna sensor is pasted onto on test specimen；The wireless interrogation device includes signal generation apparatus, RF circulators and horn antenna, signal generation apparatus is connect by RF circulators with horn antenna, the wireless interrogation device emits interrogation signal to wireless sensor by horn antenna, and the reflection signal of reception antenna sensor；The data acquisition and processing unit, connect with RF circulators, for receiving the signal from wireless interrogation device and handling it, generate the variation of antenna sensor resonant frequency and the length of crack propagation and direction in Fatigue Cracks Propagation.The present invention may be implemented wireless online and monitor crack Propagation length and direction in real time.
Description
Technical field
The present invention relates to metal structure health monitoring fields, and in particular to a kind of fatigue based on microstrip antenna sensor is split
Line extends monitoring system and its monitoring method.
Background technology
Metal structure is widely used in the fields such as modern machinery and equipment, civil engineering, ocean structure, aerospace.Long-term
Stand under load during, metal structure inevitably will produce various damages.Fatigue crack is the most common failure mode of metal structure,
Feature is：Crackle forms initial stage, and metal structure can still work normally, when crackle expands to certain journey under alternate load effect
Degree, then may cause catastrophic effect.In order to ensure safe operation and extend as far as possible its service life of metal structure, generally
Method be that health monitoring is carried out to it using sensor.
Crack detection passes through the research of decades, has been developed that many relatively effective methods.Common method has super
Sound detection, Magnetic testing, ray detection, Liquid penetrant testing, EDDY CURRENT and metal magnetic memory test.But these methods all exist than
Obvious defect, quantitative inaccurate, the qualitative difficulty of ultrasonic detection technology, and it is not intuitive, while ultrasound detection is to operator
Member's is more demanding；Magnetic testing can only carry out crack detection to magnetic metal configuration surface or near surface, can not judge crackle
Depth；X-ray Testing Technology equipment is more complex, and cost is higher, and detection cycle is long, needs to protect in detection process；Detection method
The surface distribution of defect can only be detected, it is difficult to determine the actual grade of crackle；EDDY CURRENT can only detect near surface crackle；Metal
For Magnetic memory testing as the detection method newly risen in recent years, detection mechanism research is also immature, quantitative detection research also in
Starting stage.The above method is required for detecting after shutting down, it is difficult to realize that real-time online detects crack Propagation.
Invention content
In order to overcome the above-mentioned deficiencies of the prior art, the present invention provides a kind of fatigues based on microstrip antenna sensor to split
Line extends monitoring system and its monitoring method, the extension of energy real time on-line monitoring fatigue crack.
The technical solution adopted in the present invention is：
There is provided it is a kind of based on microstrip antenna sensor crack Propagation monitoring system, including microstrip antenna sensor,
Wireless interrogation device and data acquisition and processing unit；
The microstrip antenna sensor is pasted onto on test specimen；
The wireless interrogation device includes that signal generation apparatus, RF circulators and horn antenna, signal generation apparatus pass through
RF circulators are connect with horn antenna, and the wireless interrogation device emits interrogation signal to wireless sensor by horn antenna,
And the reflection signal of reception antenna sensor；
The data acquisition and processing unit, connect with RF circulators, for receiving the signal from wireless interrogation device
And it is handled, generate the variation of antenna sensor resonant frequency and the length of crack propagation in Fatigue Cracks Propagation
The direction and.
Connect above-mentioned technical proposal, microstrip antenna sensor includes matrix, and the one side of matrix is equipped with conductor patch, matrix it is another
It is pasted onto test specimen surface on one side.
Connect above-mentioned technical proposal, the wireless interrogation device periodic emission interrogation signal.
Above-mentioned technical proposal is connect, the conductor is good conductor copper, and matrix is insulating materials.
The fatigue crack for the crack Propagation monitoring system based on microstrip antenna sensor that the present invention also provides a kind of
Monitoring method includes the following steps：
1) microstrip antenna sensor is set：The microstrip antenna sensor made is pasted onto test specimen using seccotine
Surface；
2) interrogation signal tranmitting frequency and the frequency range of signal are set：According to actual requirement, setting interrogation signal emits
Frequency；According to the resonant frequency f for the microstrip antenna sensor mader, interrogation signal frequency range is set；.
3) crack Propagation is monitored on-line：Wireless interrogation device constantly to microstrip antenna sensor emission interrogation signal,
The signal for receiving microstrip antenna sensor emission simultaneously, since meeting is lossy during signal reflex, when the frequency of transmitting signal
When identical with the resonant frequency of microstrip antenna sensor, loss is minimum；Signal acquisition and processing unit connect from wireless interrogation device
The collection of letters number, and signal is handled to obtain the resonant frequency f of two different directions of microstrip antenna sensor01And f10, according to
The variation delta f of resonant frequency01With Δ f10, obtain length and the direction of micro-strip crack Propagation；Wherein when current parallel in
When conductor patch length direction, radiation mode TM01, respective resonant frequencies f01, when current parallel is in conductor patch width side
Xiang Shi, radiation mode TM10, respective resonant frequencies f10。
The beneficial effect comprise that：The microstrip antenna that the system of the monitoring crack Propagation of the present invention uses passes
Sensor is ultra-thin light, makes simply, at low cost, can be conformal with monitored structure；By RF circulators can will transmitting signal and
Signal isolation is received, realize the signal transmitting of horn antenna and is received.The present invention may be implemented wireless online and monitor fatigue in real time
Crack extending length and direction.
Description of the drawings
Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing：
Fig. 1 is the structural schematic diagram of the present invention；
Fig. 2 is microstrip antenna sensor structure schematic diagram in the present invention；
Fig. 3 is embodiment test specimen schematic diagram；
Fig. 4 is variations of the resonant frequency f01 with crack Propagation.
Specific implementation mode
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, not
For limiting the present invention.
As shown in Figure 1, crack Propagation of the embodiment of the present invention based on microstrip antenna sensor monitors system, including it is micro-
Band antenna sensor, wireless interrogation device and data acquisition and processing unit；
The microstrip antenna sensor is pasted onto on test specimen；
The wireless interrogation device includes that signal generation apparatus, RF circulators and horn antenna, signal generation apparatus pass through
RF circulators are connect with horn antenna, and the signal generation apparatus generates wireless interrogation signal, is transmitted by the horn antenna
Microstrip antenna sensor is given, and realizes that microstrip antenna sensor reflects the reception of signal by RF circulators.The wireless interrogation
The period of device transmitting interrogation signal can be configured according to actual conditions, and the frequency range for emitting signal can be according to microstrip antenna
The resonant frequency of sensor is adjusted.
The data acquisition and processing unit, connect with RF circulators, for receiving the signal from wireless interrogation device
And " crack length-resonant frequency " (or " crack length-resonant frequency the variable quantity ") relation curve obtained according to fitting, it obtains
To fatigue crack transversely with longitudinal extension length, and then crack propagation path is fitted, be expanded directional information.
Further, microstrip antenna sensor includes matrix, and the one side of matrix is equipped with conductor patch, and the another side of matrix is viscous
It is attached to test specimen surface.
Further, the conductor is good conductor copper, and matrix is insulating materials.In the embodiment of the present invention, matrix uses exhausted
Edge material, including polytetrafluoroethylene (PTFE).Polyimides, FR4 etc..
As shown in Fig. 2, the microstrip antenna sensor includes matrix 2, it is coated with one layer of thin copper on one side, by etching
Another side to the conductor patch 1, matrix is pasted onto by 3 surface of geodesic structure；Conductor patch 1 and matrix 2 are according to different humorous
Vibration frequency uses different size and material, shown in formula specific as follows：
Wherein, c is the light velocity in vacuum, and the length of L conductor patch, w is conductor patch width, εreEffective dielectric of matrix
Constant, εrIt is the dielectric constant of matrix, h is stromal thickness, Δ LocIt is the line development length generated due to edge effect, frFor day
The resonant frequency of line, when current parallel is in 1 length direction of conductor patch, i.e., radiation mode is TM01, respective resonant frequencies fr
=f01, when current parallel is in 1 width direction of conductor patch, i.e., radiation mode is TM10, respective resonant frequencies fr=f10。
The conductor 1 uses good conductor copper, matrix 2 to use insulating materials, including polytetrafluoroethylene (PTFE).Polyimides.FR4
Deng.
The wireless interrogation device includes signal generation apparatus, horn antenna and RF circulators, the signal generation apparatus
Wireless interrogation signal is generated, the horn antenna emits wireless interrogation signal and receives reflection signal, due to the use of a bugle
Transmitter-receiver device of the antenna as signal, thus signal be easy " obscuring ", the RF circulators can will transmitting signal and
Signal isolation is received, realize the signal transmitting of horn antenna and is received.
The signal generation apparatus generates wireless interrogation signal, and microstrip antenna sensor is sent to by the horn antenna
And realize that microstrip antenna sensor reflects the reception of signal by the RF annulars.
The data acquisition and processing unit are for receiving the signal from wireless interrogation device and handling it, root
According to " crack length-resonant frequency " (or " crack length-resonant frequency variable quantity ") relation curve that fitting obtains, obtain tired
Labor crackle transversely with longitudinal extension length, and then fits crack propagation path, and be expanded directional information.
Crack Propagation monitoring method based on above-described embodiment, using microstrip antenna sensor to crack Propagation
It is monitored in real time, inquiry is carried out to microstrip antenna sensor by wireless interrogation device and receives reflection signal, then passed through
Data acquire and processing unit receives the signal from wireless interrogation device and handles it, and it is long to obtain crack Propagation
Degree and directional information.
The period of the wireless interrogation device transmitting interrogation signal can be configured according to actual conditions, emit the frequency of signal
The resonant frequency of rate range root microstrip antenna sensor is adjusted.
Fatigue crack monitoring method specifically comprises the following steps：
1) microstrip antenna sensor is set：The microstrip antenna sensor made is pasted onto test specimen using seccotine
(3) surface；
2) interrogation signal tranmitting frequency and the frequency range of signal are set：According to actual requirement, setting interrogation signal emits
Frequency；According to the resonant frequency f for the microstrip antenna sensor mader, interrogation signal frequency range is set.
3) crack Propagation is monitored on-line：Wireless interrogation device constantly to microstrip antenna sensor emission interrogation signal,
The signal for receiving microstrip antenna sensor emission simultaneously, since meeting is lossy during signal reflex, when the frequency of transmitting signal
When identical with the resonant frequency of microstrip antenna sensor, loss is minimum；Signal sampling and processing device connects from wireless interrogation device
The collection of letters number, and signal is handled to obtain the resonant frequency f of microstrip antenna sensor01And f10, according to the variation of resonant frequency
Measure Δ f01With Δ f10, fitting formula shown in 4, the extension obtained in the online respective direction of micro-strip fatigue crack with reference to the accompanying drawings grow
Degree, and then the angle being expanded.Illustrate that embodiments of the present invention illustrate in conjunction with embodiment：
Conductor patch material selection copper, size 40mm*28mm*0.05mm；Host material selects FR4, size 64mm*
44mm*0.5mm dielectric constant 4.4；It is steel plate, size 80mm*44mm*1mm by geodesic structure.The sensor of design is theoretical
Resonant frequency is f01=1.92224GHz, f10=2.52764GHz.When monitoring system works, become by the resonant frequency measured
Change amount Δ f01With Δ f10, length and the direction of crack Propagation can be obtained.
As shown in figure 3, applying fatigue load, with the continuous extension of crackle, antenna sensor at test specimen both ends
Resonant frequency constantly changes, as shown in Figure 4.As seen from the figure, it is parallel to the resonant frequency f in patch length direction01Constantly reduce.By
Test specimen two ends are acted in fatigue load, crack propagation path is substantially extended along straight line, therefore can be parallel to antenna sensor
The resonant frequency f of length direction01It is affected, and to being parallel to the resonant frequency f of width direction10Influence very little, this and monitoring
As a result consistent.
In conclusion the crack Propagation based on microstrip antenna sensor of the present invention monitors system and monitoring method can
To realize that wireless online monitors crack Propagation length and the purpose in direction in real time.It is provided for fatigue crack monitoring a kind of new
Monitoring method.
It should be understood that for those of ordinary skills, it can be modified or changed according to the above description,
And all these modifications and variations should all belong to the protection domain of appended claims of the present invention.
Claims (5)
1. a kind of crack Propagation based on microstrip antenna sensor monitors system, which is characterized in that passed including microstrip antenna
Sensor, wireless interrogation device and data acquisition and processing unit；
The microstrip antenna sensor is pasted onto on test specimen；
The wireless interrogation device includes signal generation apparatus, RF circulators and horn antenna, and signal generation apparatus passes through RF rings
Shape device is connect with horn antenna, and the wireless interrogation device emits interrogation signal to wireless sensor by horn antenna, and connects
Receive the reflection signal of antenna sensor；
Data acquisition and processing unit, connects with RF circulators, are used to receive the signal from wireless interrogation device and right
It is handled, " crack length-resonant frequency " obtained according to fitting（Or " crack length-resonant frequency variable quantity "）It closes
It is curve, obtains extension length of the fatigue crack transversely with longitudinal direction, and then fit crack propagation path, be expanded direction
Information.
2. the crack Propagation according to claim 1 based on microstrip antenna sensor monitors system, which is characterized in that
Microstrip antenna sensor includes matrix, and the one side of matrix is equipped with conductor patch, and the another side of matrix is pasted onto test specimen surface.
3. the crack Propagation according to claim 1 based on microstrip antenna sensor monitors system, which is characterized in that
The wireless interrogation device periodic emission interrogation signal.
4. the crack Propagation according to claim 2 based on microstrip antenna sensor monitors system, which is characterized in that
The conductor is good conductor copper, and matrix is insulating materials.
5. the fatigue crack prison of the crack Propagation monitoring system according to claim 2 based on microstrip antenna sensor
Survey method, which is characterized in that include the following steps：
1）Microstrip antenna sensor is set：The microstrip antenna sensor made is pasted onto test specimen table using seccotine
Face；
2）Interrogation signal tranmitting frequency and the frequency range of signal are set：According to actual requirement, interrogation signal tranmitting frequency is set；
According to the resonant frequency for the microstrip antenna sensor made, interrogation signal frequency range is set；
3）Crack Propagation is monitored on-line：Wireless interrogation device is constantly to microstrip antenna sensor emission interrogation signal, simultaneously
The signal for receiving microstrip antenna sensor emission, due to can be lossy during signal reflex, when the frequency of transmitting signal and micro-
When resonant frequency with antenna sensor is identical, loss is minimum；Signal acquisition and processing unit are received from wireless interrogation device to be believed
Number, and signal is handled to obtain the resonant frequency of two different directions of microstrip antenna sensorf 01 Withf 10 , according to resonance
The variation delta of frequencyf 01 And Δf 10 , obtain length and the direction of micro-strip crack Propagation；Wherein when current parallel is in conductor
When patch length direction, radiation mode isTM 01 , respective resonant frequencies aref 01 , when current parallel is in conductor patch width direction
When, radiation mode isTM 10 , respective resonant frequencies aref 10 。
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109828020A (en) * | 2019-03-25 | 2019-05-31 | 广东工业大学 | A kind of Metal Crack detection system and method |
| CN110375686A (en) * | 2019-07-09 | 2019-10-25 | 武汉理工大学 | Wireless flexible micro-strip paster antenna sensor array for metal structure crackle and strain monitoring |
| CN111257380A (en) * | 2020-01-16 | 2020-06-09 | 武汉理工大学 | Passive wireless temperature crack binary sensor array based on microstrip antenna |
| CN112254760A (en) * | 2020-09-23 | 2021-01-22 | 武汉理工大学 | Strain crack decoupling measurement sensor based on multilayer microstrip antenna |
| CN112730976A (en) * | 2020-12-09 | 2021-04-30 | 武汉汉烯科技有限公司 | Conformal microstrip antenna metal crack detector based on macroscopic graphene and detection method |
| CN113108685A (en) * | 2021-04-12 | 2021-07-13 | 吉林大学 | Material-reducing dual-frequency differential type microstrip antenna strain sensor and method |
| CN114252357A (en) * | 2021-12-17 | 2022-03-29 | 中国人民解放军陆军装甲兵学院 | Metal surface crack monitoring based on RFID antenna sensor |
| WO2024002040A1 (en) * | 2022-06-30 | 2024-01-04 | 青岛理工大学 | Wireless microstrip patch antenna sensor and application thereof in field of debonding defect detection |
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| CN112254760A (en) * | 2020-09-23 | 2021-01-22 | 武汉理工大学 | Strain crack decoupling measurement sensor based on multilayer microstrip antenna |
| CN112730976A (en) * | 2020-12-09 | 2021-04-30 | 武汉汉烯科技有限公司 | Conformal microstrip antenna metal crack detector based on macroscopic graphene and detection method |
| CN113108685A (en) * | 2021-04-12 | 2021-07-13 | 吉林大学 | Material-reducing dual-frequency differential type microstrip antenna strain sensor and method |
| CN114252357A (en) * | 2021-12-17 | 2022-03-29 | 中国人民解放军陆军装甲兵学院 | Metal surface crack monitoring based on RFID antenna sensor |
| WO2024002040A1 (en) * | 2022-06-30 | 2024-01-04 | 青岛理工大学 | Wireless microstrip patch antenna sensor and application thereof in field of debonding defect detection |
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