CN107275750A - A kind of remote anti-metal tag antenna sensor - Google Patents
A kind of remote anti-metal tag antenna sensor Download PDFInfo
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- CN107275750A CN107275750A CN201710330824.9A CN201710330824A CN107275750A CN 107275750 A CN107275750 A CN 107275750A CN 201710330824 A CN201710330824 A CN 201710330824A CN 107275750 A CN107275750 A CN 107275750A
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- tag antenna
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- metal
- metal tag
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
- H01Q1/2225—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal
-
- G—PHYSICS
- G01—MEASURING; TESTING
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
Abstract
The invention discloses a kind of remote anti-metal tag antenna sensor, mainly including dielectric resonator, metal band and label chip, wherein, dielectric resonator is operated in HEM11δUnder pattern, metal band is located at the top of dielectric resonator, and label chip is located at the central opening of metal band；When anti-metal tag antenna works, anti-metal tag antenna is first placed in the top of monitored metallic object, the impedance of the target impedance and label chip of anti-metal tag antenna is adjusted simultaneously, make the target input impedance of anti-metal tag antenna at center frequency point and label chip impedance conjugate impedance match, when anti-metal tag antenna starts to detect monitored metallic object, determine that monitored metallic object whether there is defect by observing the activation power change of anti-metal tag, there is low cost, remote, high accurancy and precision.
Description
Technical field
The invention belongs to radio frequency identification and sensory field, more specifically, it is related to a kind of remote anti-metal tag day
Line sensor.
Background technology
In key areas such as track traffic, oil and gas pipeline, nuclear energy and power equipments, hardware (steel, iron, aluminium,
Titanium alloy etc.) it is chief component.Due to being chronically exposed to open-air atmosphere and frequently stress, crackle is hardware
Common defect, it is the key for ensureing its safe and reliable operation in life cycle that extensive facility, which is continuously monitored,.By
In equipment is heavy, slow, the detectable scope of detection speed is small and automaticity is low, if conventional lossless detection technique is used for detecting big
Damage in scale facility, particularly under complex environment, poor feasibility or cost are huge.Distributed Wireless Sensor Networks are
Ensure the strong selection of extensive facility structure health, it is intended to by time-based maintenance develop into it is more cost-effective based on
The maintenance of situation and the assessment of life cycle.Current most wireless sensor node is powered using battery, is disposed billions of
Battery will cause long-term risk to environment.Simultaneously limited battery life limits the granularity of sensing node deployment and adds dimension
Protect cost.Therefore, the monitoring structural health conditions of extensive facility promote novel radio sensing network towards passive, intelligent, low work(
Consumption, inexpensive and highly reliable direction are developed.
RFID tag cognition technology is a New Sensing Technology of rising in recent years, the basis for identifying and following the trail of in RFID
Upper imparting Intellisense function, with low cost, low-power consumption, intellectuality and the features such as be wirelessly transferred, can be monitored tested in real time
Survey the state of environment (such as temperature, humidity).RFID sensing technologies are expanded to the healthy shape of mark object from the monitoring to environment
The detection and assessment of state, label antenna cognition technology obtain label reader by passive RFID tags antenna and send wireless energy
While detection be identified object health status, and by backscatter communication mode via wireless channel outside certain distance
Receive and extract institute's marker volume defect information.The extra senser element due to not needing, passive RFID tags antenna is perceived
Technology can further reduce the power consumption and cost of sensing node, be node cost or the extensive facility long term monitoring of longevity
Important means.
Passive RFID tags antenna sensing actually simulates cognition technology, and it, which is sensed, disturbs dependent on antenna mode and thus draw
The impedance mismatching risen, therefore antenna mode is to realize the key reliably detected to different shape, dimensional defects with impedance matching.Mark
Antenna sensing technology simultaneous transmission perception information in information and energy transfer process is signed, therefore, communication can mutual shadow with sensing
Ring.That is, it is to improve sensor-based system operating distance and reliability that label antenna model selection, impedance matching and gain, which are improved,
Key.Design such sensor and apply the significant challenge being related to have in terms of Non-Destructive Testing with monitoring structural health conditions：
1) metal surface can be arranged on：The design of RFID label antenna is installed by a series of limitations for metal：It is low into
This, low profile and conformal structure, it is good and with higher gain in the good conductor surface matching of various sizes and shape；
2) sensing is oriented to：Antenna correctly should be able to reliably detect and characterize cracks of metal surface as sensor, at least exist
It is the interior holding dullness of most of essential scopes and sensitive enough；
3) performance balance or compromise：Antenna sensor has communication and sensing capability concurrently, and communication and sensing capability may have
There is demand on the contrary：The antenna of label is typically designed under health status and label chip conjugate impedance match, and the generation of defect
And propagation can cause the impedance mismatching (disturbance) of label antenna and chip, this will cause the reduction of communication distance；
4) Internet of Things big data and decision-making：In order to implement the maintenance based on situation to extensive facility, defect easily sends out region
Sensing node be distributed granularity and defect are reliably detected online and assessment is the key of technology application.
The content of the invention
Sensed it is an object of the invention to overcome the deficiencies of the prior art and provide a kind of remote anti-metal tag antenna
Device, the characteristics of having merged Non-Destructive Testing and monitoring structural health conditions is monitored on-line to extensive facility, with low cost, far
The advantages of distance, high accurancy and precision.
For achieving the above object, a kind of remote anti-metal tag antenna sensor of the present invention, it is characterised in that bag
Include：Dielectric resonator, metal band and label chip；
Described dielectric resonator, as antenna radiator, is operated in HEM using the columnar ceramic of high-k11δMould
Under formula, for reducing tag antenna dimension and improving gain；
Described metal band is located at the top of dielectric resonator, and the size of metal band can be adjusted, and swashs for pattern
Encourage and impedance matching, in the reserved opening of metal band center position, being sized to of opening accommodates label chip；
Described label chip is located at the central opening of metal band, the transmission for radio communication and transducing signal.
Secondly, present invention also offers a kind of side that defects detection is carried out using remote anti-metal tag antenna sensor
Method, it is characterised in that comprise the following steps：
(1), anti-metal tag antenna sensor is placed in the top of monitored metallic object；
(2), according to the label chip and center frequency point of selection, the target input resistance of anti-metal tag antenna sensor is determined
It is anti-；
(3), the size of regulation dielectric resonator and metal band, makes the target impedance of anti-metal tag antenna sensor exist
At center frequency point and label chip impedance conjugate impedance match；
(4), label reader sends activation power Active label chip, and anti-metal tag antenna sensor starts to detect quilt
Monitoring metallic object simultaneously returns to certain power output to label reader, when observing that power changes on label reader
When, then the input impedance of anti-metal tag antenna sensor and the impedance mismatching of label chip or resonance frequency shift, that is, correspond to
Monitored metallic object existing defects.
What the goal of the invention of the present invention was realized in：
A kind of remote anti-metal tag antenna sensor of the present invention, mainly including dielectric resonator, metal band and mark
Chip is signed, wherein, dielectric resonator is operated in HEM11δUnder pattern, metal band is located at the top of dielectric resonator, label chip
At the central opening of metal band；When anti-metal tag antenna works, anti-metal tag antenna is first placed in monitored gold
Belong to the top of body, while adjusting the impedance of the target impedance and label chip of anti-metal tag antenna, make anti-metal tag antenna
Target input impedance at center frequency point and label chip impedance conjugate impedance match, when anti-metal tag antenna start detect quilt
When monitoring metallic object, determine that monitored metallic object whether there is defect by observing the activation power change of anti-metal tag,
There is low cost, remote, high accurancy and precision.
Brief description of the drawings
Fig. 1 is the schematic diagram of remote anti-metal tag antenna sensor of the present invention；
Fig. 2 is the magnetic distribution of dielectric resonator；
Fig. 3 is anti-metal tag antenna sensor input impedance regulation simulation curve and reflectance factor；
Fig. 4 is change curve of the anti-metal tag antenna sensor Simulation reflectance factor with crack depth；
Fig. 5 is the change curve of anti-metal tag antenna sensor Simulation actual gain and reading distance with crack depth.
Embodiment
The embodiment to the present invention is described below in conjunction with the accompanying drawings, so as to those skilled in the art preferably
Understand the present invention.Requiring particular attention is that, in the following description, when known function and design detailed description perhaps
When can desalinate the main contents of the present invention, these descriptions will be ignored herein.
Embodiment
Fig. 1 is the schematic diagram of anti-metal tag antenna of the present invention.
In the present embodiment, design a gain for 3-dBi label antenna sensor and can in 2-m apart from outer to surface
Crack depth resolution capability reaches 1mm anti-metal tag antenna.As shown in figure 1, anti-metal tag antenna sensor, including：
Dielectric resonator, metal band and label chip, wherein, Fig. 1 (a) is the front view of anti-metal tag antenna, and Fig. 1 (b) is anti-
The side view of metal tag antenna.
Dielectric resonator is used from dielectric constant as 90, and loss angle tangent is used as antenna for 0.00001 columnar ceramic
Radiant body, is operated in HEM11δUnder pattern, for reducing tag antenna dimension and improving gain, wherein, encourage HEM11δPattern
Overall size is set to L × h=30mm × 12mm；In order to realize the reliable detection to cracks of metal surface, the anti-metal tag day
Cable architecture Magnetic Field Design is reaches maximum in the interface center of dielectric resonator and monitored metallic object, and electric field is in medium
The both sides of resonator reach maximum, wherein, the corresponding electric field of dielectric resonator and Distribution of Magnetic Field are as shown in Fig. 2 Fig. 2 (a) is to be situated between
The distribution map of the electric field of matter resonator, Fig. 2 (b) is the Distribution of Magnetic Field figure of dielectric resonator.
Metal band is located at the top of dielectric resonator, and the size of metal band can be adjusted, in the present embodiment, metal
Band is sized to Ls×Ws=27mm × 1mm, metal band is mainly used in mode excitation and impedance matching, in bonding jumper
The reserved opening of band center position, being sized to of opening accommodates label chip；
Label chip is located at the central opening of metal band, for the transmission of radio communication and transducing signal, label core
Piece selects model IMPINJ MONZA 4QT passive label chips.
The process that defects detection is carried out to a certain metallic object below with anti-metal tag antenna sensor is carried out specifically
Bright, if a certain metallic object is sized to 100mm × 100mm × 5mm, it is L to have a size on the surface of metallic objectc×Wc
×dcA transverse surface cracks, crackle is orthogonal with metal band, and what it was detected concretely comprises the following steps：
(1), anti-metal tag antenna sensor is placed in the top of monitored metallic object；
(2), according to the label chip and center frequency point of selection, the target input resistance of anti-metal tag antenna sensor is determined
It is anti-；In the present embodiment, the input impedance of the label chip and typical case's reading sensitivity are respectively at 915MHz center frequency points
Zchip=11-j143 Ω and Pth=-17.4dBm；
(3), adjust the size of metal band, make the target impedance of anti-metal tag antenna sensor at center frequency point with
The impedance conjugate impedance match of label chip；In the present embodiment, by crack depth dcIt is set to 0mm and by metal band width WsIf
1mm is set to, to metal band LsLength scanning, gained input impedance and reflectance factor are carried out as shown in figure 3, wherein, Fig. 3 (a)
It is input impedance distribution map, Fig. 3 (b) is reflectance factor distribution map.It can be seen that, change LsThe defeated of antenna can effectively be adjusted
Enter reactance, when L is arrived in the size regulation of metal bands×Ws=27mm × 1mm, with objective chip impedance near center frequency point it is real
Existing conjugate impedance match；
(4), label reader sends certain power Active label chip, and anti-metal tag antenna sensor starts detection
Monitored metallic object simultaneously returns to certain power output to label reader, when observing that power changes on label reader
When, then the input impedance of anti-metal tag antenna sensor and the impedance mismatching of label chip or resonance frequency shift, that is, correspond to
Monitored metallic object existing defects, label reader end can be monitored by monitoring the intensity and IQ demodulated signals of return power
The generation of defect and degree.
In the present embodiment, by crack length LcWith width WcBe respectively set to 20mm and 1mm, mounting medium resonator and
Metal band size, to crack depth dcIt is scanned by step-length of 1mm, gained reflectance factor is as shown in figure 4, simultaneously, Fig. 5 gives
Corresponding crack depth d is gone outcActual gain and under 4-W equivalent isotropically radiated powers label theoretical reading distance, can be with
See, change dcThe actual gain and reading distance of anti-metal tag antenna can be significantly changed.
Wherein, minimum reading distance DminIt can be calculated as follows with the relation of anti-metal tag antenna sensor actual gain：
Wherein, λ0Represent wavelength, GrealThe actual gain of anti-metal tag antenna sensor is represented, EIRP represents that label is read
Read equivalent omnidirectional's transmit power of device, PthThe receiving sensitivity of label chip is represented, ρ represents label reader and anti-metal tag
Polarization mismatch between antenna sensor.
Further, the minimum power needed for label reader activation label chip can be calculated by following formula：
Wherein, DminRepresent minimum reading distance, GRRepresent the gain of label reader.
In addition, the present invention can not only detect crack defect, the normal defect of corrosion metal surface can also be detected.
Although illustrative embodiment of the invention is described above, in order to the technology of the art
Personnel understand the present invention, it should be apparent that the invention is not restricted to the scope of embodiment, to the common skill of the art
For art personnel, as long as various change is in the spirit and scope of the present invention that appended claim is limited and is determined, these
Change is it will be apparent that all utilize the innovation and creation of present inventive concept in the row of protection.
Claims (6)
1. a kind of remote anti-metal tag antenna sensor, it is characterised in that including：Dielectric resonator, metal band and mark
Sign chip；
Described dielectric resonator, as antenna radiator, is operated in HEM using the columnar ceramic of high-k11δUnder pattern,
For reducing tag antenna dimension and improving gain；
Described metal band is located at the side of dielectric resonator, and the size of metal band can be adjusted, for mode excitation and resistance
Anti- matching, in the reserved opening of metal band center position, being sized to of opening accommodates label chip；
Described label chip is located at the central opening of metal band, the transmission for radio communication and transducing signal.
2. a kind of remote anti-metal tag antenna sensor according to claim 1, it is characterised in that described medium
Resonator is 90 from dielectric constant, and loss angle tangent is 0.00001 columnar ceramic.
3. a kind of remote anti-metal tag antenna sensor according to claim 1, it is characterised in that described label
Chip selects model IMPINJ MONZA 4QT passive label chips.
4. a kind of method that remote anti-metal tag antenna sensor using described in claim 1 carries out defects detection, its
It is characterised by, comprises the following steps：
(1), anti-metal tag antenna sensor is placed in the top of monitored metallic object；
(2), according to the label chip and center frequency point of selection, the target input impedance of anti-metal tag antenna sensor is determined；
(3), the size of regulation dielectric resonator and metal band, makes the target impedance of anti-metal tag antenna sensor at center
At frequency and label chip impedance conjugate impedance match；
(4), label reader sends activation power Active label chip, and it is monitored that anti-metal tag antenna sensor starts detection
Metallic object simultaneously returns to certain power output to label reader, when observing that activation power changes on label reader
When, then the input impedance of anti-metal tag antenna sensor and the impedance mismatching of label chip or resonance frequency shift, that is, correspond to
Monitored metallic object existing defects.
5. the method that remote anti-metal tag antenna sensor according to claim 4 carries out defects detection, its feature
It is, described defect includes the metal surface normal defects such as crackle, corrosion.
6. the method that remote anti-metal tag antenna sensor according to claim 4 carries out defects detection, its feature
It is, the computational methods of described activation power are：
(6.1) the minimum reading distance D of label reader, is calculatedmin：
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Wherein, λ0Represent wavelength, GrealThe actual gain of anti-metal tag antenna sensor is represented, EIRP represents label reader
Equivalent omnidirectional's transmit power, PthThe receiving sensitivity of label chip is represented, ρ represents label reader and anti-metal tag antenna
Polarization mismatch between sensor；
(6.2) minimum needed for, calculating label reader activation label chip activates power and is：
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Wherein, DminRepresent minimum reading distance, GRRepresent the gain of label reader.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710330824.9A CN107275750B (en) | 2017-05-11 | 2017-05-11 | Long-distance anti-metal tag antenna sensor and defect detection method |
Applications Claiming Priority (1)
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| CN201710330824.9A CN107275750B (en) | 2017-05-11 | 2017-05-11 | Long-distance anti-metal tag antenna sensor and defect detection method |
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| CN107275750A true CN107275750A (en) | 2017-10-20 |
| CN107275750B CN107275750B (en) | 2020-01-17 |
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| CN201710330824.9A Expired - Fee Related CN107275750B (en) | 2017-05-11 | 2017-05-11 | Long-distance anti-metal tag antenna sensor and defect detection method |
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Cited By (6)
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| CN109211978A (en) * | 2018-07-26 | 2019-01-15 | 中国人民解放军陆军装甲兵学院 | A kind of crackle sensing label and method |
| CN109754053A (en) * | 2018-12-17 | 2019-05-14 | 广东工业大学 | Miniaturization high-gain anti-metal tag antenna based on dielectric resonator |
| CN109828020A (en) * | 2019-03-25 | 2019-05-31 | 广东工业大学 | A kind of Metal Crack detection system and method |
| CN110598815A (en) * | 2019-09-17 | 2019-12-20 | 西南科技大学 | UHF passive RFID-based metal structure health detection method |
| CN111027180A (en) * | 2019-11-15 | 2020-04-17 | 中国人民解放军陆军装甲兵学院 | Surface crack length identification method based on RFID (radio frequency identification) label |
| CN111211399A (en) * | 2020-03-04 | 2020-05-29 | 电子科技大学 | Metal-resistant ultrahigh frequency electronic tag antenna conformal to petroleum pipe sleeve wall |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109211978A (en) * | 2018-07-26 | 2019-01-15 | 中国人民解放军陆军装甲兵学院 | A kind of crackle sensing label and method |
| CN109211978B (en) * | 2018-07-26 | 2020-11-24 | 中国人民解放军陆军装甲兵学院 | Crack sensing label and method |
| CN109754053A (en) * | 2018-12-17 | 2019-05-14 | 广东工业大学 | Miniaturization high-gain anti-metal tag antenna based on dielectric resonator |
| CN109828020A (en) * | 2019-03-25 | 2019-05-31 | 广东工业大学 | A kind of Metal Crack detection system and method |
| CN110598815A (en) * | 2019-09-17 | 2019-12-20 | 西南科技大学 | UHF passive RFID-based metal structure health detection method |
| CN110598815B (en) * | 2019-09-17 | 2022-03-25 | 西南科技大学 | UHF passive RFID-based metal structure health detection method |
| CN111027180A (en) * | 2019-11-15 | 2020-04-17 | 中国人民解放军陆军装甲兵学院 | Surface crack length identification method based on RFID (radio frequency identification) label |
| CN111211399A (en) * | 2020-03-04 | 2020-05-29 | 电子科技大学 | Metal-resistant ultrahigh frequency electronic tag antenna conformal to petroleum pipe sleeve wall |
| CN111211399B (en) * | 2020-03-04 | 2021-10-26 | 电子科技大学 | Metal-resistant ultrahigh frequency electronic tag antenna conformal to petroleum pipe sleeve wall |
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| Publication number | Publication date |
|---|---|
| CN107275750B (en) | 2020-01-17 |
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