CN114136999A - Complementary split resonant ring electromagnetic detection unit, detection system and detection method - Google Patents

Complementary split resonant ring electromagnetic detection unit, detection system and detection method Download PDF

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Publication number
CN114136999A
CN114136999A CN202111668287.1A CN202111668287A CN114136999A CN 114136999 A CN114136999 A CN 114136999A CN 202111668287 A CN202111668287 A CN 202111668287A CN 114136999 A CN114136999 A CN 114136999A
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substrate
complementary split
ring
detection
radio frequency
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李勇
刘福广
杨二娟
米紫昊
刘刚
王艳松
杨兰
韩天鹏
王博
张周博
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Xian Thermal Power Research Institute Co Ltd
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Xian Thermal Power Research Institute Co Ltd
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    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/20—Metals
    • G01N33/204—Structure thereof, e.g. crystal structure
    • G01N33/2045—Defects
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P3/00—Waveguides; Transmission lines of the waveguide type
    • H01P3/02—Waveguides; Transmission lines of the waveguide type with two longitudinal conductors
    • H01P3/026—Coplanar striplines [CPS]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P7/00—Resonators of the waveguide type
    • H01P7/06—Cavity resonators
    • H01P7/065—Cavity resonators integrated in a substrate

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Abstract

The invention discloses a complementary split ring electromagnetic detection unit, a detection system and a detection method, wherein the detection unit comprises a substrate integrated waveguide resonant cavity which is surrounded by a plurality of shielding through holes arranged on the substrate, a complementary split ring electromagnetic structure is arranged in the center of the substrate integrated waveguide resonant cavity, and the complementary split ring electromagnetic structure is two split rings which are nested and isolated from each other; one side of the substrate integrated waveguide resonant cavity on the upper surface of the substrate is connected with a microstrip line, and the other side of the microstrip line is connected with a main feed radio frequency connector; one side of the substrate integrated waveguide resonant cavity on the lower surface of the substrate is connected with two coplanar waveguide central conductors, the two coplanar waveguide central conductors and the coplanar waveguide gaps thereof form a coplanar waveguide transmission line with preset impedance, and the other end of the coplanar waveguide transmission line is connected with a sub-feed radio frequency connector; the main feed radio frequency connector and the sub feed radio frequency connector are orthogonal and distributed on the upper surface and the lower surface of the substrate. By introducing a secondary feed circuit into the electromagnetic detection unit, the detection sensitivity is improved.

Description

Complementary split resonant ring electromagnetic detection unit, detection system and detection method
Technical Field
The invention belongs to the technical field of metal welding surface defect detection, and particularly designs an improved Complementary Split Ring Resonator (CSRR) electromagnetic detection unit, a detection system and a detection method.
Background
Non-destructive inspection techniques are intended to quickly and reliably detect, test, or evaluate discontinuities or characteristic differences in materials or structures without destroying the normal performance of the material being inspected and the component. In the industries of nuclear power stations, aviation, aerospace, pressure vessels, railways, ships, weapon systems and the like, damage and failure of any one component can cause significant danger or economic loss.
As is well known, the electromagnetic detection unit at the forefront end of the microwave nondestructive detection device is mainly a passive circuit, so that the amplitude of a resonance peak is relatively small in the detection process, and after a defect structure is detected, the amplitude of the resonance peak is smaller, so that the detection sensitivity is greatly reduced.
Disclosure of Invention
In order to overcome the problems in the prior art, the present invention provides an improved complementary split-ring electromagnetic detection unit, a detection system and a detection method, wherein a secondary feeding circuit is introduced into the electromagnetic detection unit, so as to improve the detection sensitivity of the complementary split-ring electromagnetic detection unit.
In order to achieve the purpose, the invention adopts the following technical scheme:
a complementary split ring resonator electromagnetic detection unit comprises a substrate, wherein a plurality of substrate integrated waveguide resonator shielding through holes 10 formed in the substrate are enclosed to form a substrate integrated waveguide resonator 5, a complementary split ring resonator electromagnetic structure 9 is arranged in the center of the substrate integrated waveguide resonator 5, and the complementary split ring resonator electromagnetic structure 9 is two split rings which are nested and isolated from each other; one side of a substrate integrated waveguide resonant cavity 5 on the upper surface of the substrate is connected with a microstrip line 2 through a transition structure 3, the other side of the microstrip line 2 is connected with a main feed radio frequency connector 1, and a radio frequency connector grounding through hole 6 is formed around the main feed radio frequency connector 1, so that the electrical connection of an upper metal layer and a lower metal layer of the substrate is realized; the substrate integrated waveguide resonant cavity 5 on the lower surface of the substrate and one side adjacent to one side of the upper surface connected with the microstrip line 2 are connected with two coplanar waveguide central conductors 7, the two coplanar waveguide central conductors 7 and a coplanar waveguide gap 8 between the two coplanar waveguide central conductors form a coplanar waveguide transmission line with preset impedance, the other end of the coplanar waveguide transmission line is connected with a sub-feed radio-frequency connector 4, a radio-frequency connector grounding through hole 6 is formed around the sub-feed radio-frequency connector 4, and the electrical connection of an upper metal layer and a lower metal layer of the substrate is realized; the main feed radio frequency connector 1 and the secondary feed radio frequency connector 4 are orthogonal and distributed on the upper surface and the lower surface of the substrate.
In the complementary split ring resonator electromagnetic structure 9, the length L4 of the inner ring is 1.2mm, the width L3 is 1mm, and the opening distance S2 is 0.6 mm; the outer ring length L2 is 2mm, the width L1 is 1.8mm, and the opening spacing S1 is 0.4 mm; the distance W between the outer ring and the inner ring of the split ring is 0.2 mm.
The substrate integrated waveguide resonant cavity 5 forms an approximately closed rectangular metal cavity through the plurality of substrate integrated waveguide resonant cavity shielding through holes 10 and the metal layers on the upper surface and the lower surface of the substrate.
A defect nondestructive testing system comprises a complementary split resonant ring electromagnetic testing unit, a vector network analyzer 11 connected with a main feed radio frequency connector 1 of the complementary split resonant ring electromagnetic testing unit, a phase shifter 14, an amplifier 13 and a frequency source 12 which are sequentially connected with a sub feed radio frequency connector 4 of the complementary split resonant ring electromagnetic testing unit.
Firstly, enabling a complementary split resonant ring electromagnetic detection unit to be close to a detection piece 15, and enabling a gap to be reserved between a complementary split resonant ring electromagnetic structure 9 and the detection surface of the detection piece 15; then, the calibration of microwave nondestructive detection is carried out, the complementary split resonant ring electromagnetic structure 9 is placed at the position where the detection piece 15 has no defects, the amplifier 13 and the phase shifter 14 are adjusted, and the resonance peak f on the vector network analyzer 11 is observed1Change of (2), peak to be resonated f1The amplitude of the signal is less than-20 dB, and the calibration work is finished; starting to move the complementary split resonant ring electromagnetic detection unit in parallel, and keeping a gap between the complementary split resonant ring electromagnetic structure 9 and the detection piece 15, if a resonant peak f on the vector network analyzer 11 is found1Obvious frequency deviation appears, which indicates that the surface of the detection piece 15 has defects, and marks the positions of the defects of the detection piece 15; the above operations are repeated to complete the detection of the defect of the detection member 15.
Compared with the prior art, the invention has the following advantages:
1) the improved complementary split resonant ring electromagnetic detection unit can reduce the coupling of the feed transmission line outside the substrate integrated waveguide cavity through the design of the orthogonal different-surface feed structure, and simultaneously can realize the enhancement of feed signals through the coupling in the cavity because two paths of signals enter the substrate integrated waveguide resonant cavity;
2) the transition from the microstrip to the substrate integrated waveguide structure resonant cavity adopts a grounded coplanar waveguide transmission line, so that the volume of the circuit is greatly reduced;
3) the amplifier and the phase shifter in the defect nondestructive detection system can both realize flexible adjustment of the amplitude and the phase of the signal, so that the sensitivity of the electromagnetic detection unit can be effectively improved by adjusting the gain of the amplifier and the phase adjustment of the phase shifter;
4) in the detection process, the detection device keeps a safe distance from the detection piece, and new defects cannot be generated on the detection piece.
Drawings
FIG. 1 is a schematic diagram of an upper surface structure of a complementary split-ring resonator electromagnetic detection unit according to the present invention.
FIG. 2 is a schematic view of a lower surface structure of the complementary split ring resonator electromagnetic detection unit according to the present invention.
FIG. 3 is an electromagnetic structure diagram of a complementary split ring resonator.
FIG. 4 is a diagram of the system for nondestructive testing of defects according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1 and fig. 2, the complementary split ring electromagnetic detection unit of the present invention includes a substrate, a plurality of substrate integrated waveguide resonant cavity shielding through holes 10 formed on the substrate enclose a substrate integrated waveguide resonant cavity 5, a complementary split ring electromagnetic structure 9 is disposed at a central position of the substrate integrated waveguide resonant cavity 5, and the complementary split ring electromagnetic structure 9 is two split rings that are nested and isolated from each other; one side of a substrate integrated waveguide resonant cavity 5 on the upper surface of the substrate is connected with a microstrip line 2 through a transition structure 3, the other side of the microstrip line 2 is connected with a main feed radio frequency connector 1, and a radio frequency connector grounding through hole 6 is formed around the main feed radio frequency connector 1, so that the electrical connection of an upper metal layer and a lower metal layer of the substrate is realized; the substrate integrated waveguide resonant cavity 5 on the lower surface of the substrate and one side adjacent to one side of the upper surface connected with the microstrip line 2 are connected with two coplanar waveguide central conductors 7, the two coplanar waveguide central conductors 7 and a coplanar waveguide gap 8 between the two coplanar waveguide central conductors form a coplanar waveguide transmission line with preset impedance, the other end of the coplanar waveguide transmission line is connected with a sub-feed radio-frequency connector 4, a radio-frequency connector grounding through hole 6 is formed around the sub-feed radio-frequency connector 4, and the electrical connection of an upper metal layer and a lower metal layer of the substrate is realized; the main feed radio frequency connector 1 and the secondary feed radio frequency connector 4 are orthogonal and distributed on the upper surface and the lower surface of the substrate.
The substrate integrated waveguide resonant cavity 5 forms an approximately closed rectangular metal cavity through the plurality of substrate integrated waveguide resonant cavity shielding through holes 10 and the metal layers on the upper surface and the lower surface of the substrate.
As shown in fig. 1, as a preferred embodiment of the present invention, the transition structure 3 is a slotted opening.
As shown in fig. 3, in the complementary split-ring resonator electromagnetic structure 9, the inner ring length L4 is 1.2mm, the width L3 is 1mm, and the opening distance S2 is 0.6 mm; the outer ring length L2 is 2mm, the width L1 is 1.8mm, and the opening spacing S1 is 0.4 mm; the distance W between the outer ring and the inner ring of the split ring is 0.2 mm.
As shown in fig. 4, the defect nondestructive testing system of the present invention includes the complementary split resonant ring electromagnetic testing unit, the vector network analyzer 11 connected to the main feed rf connector 1 of the complementary split resonant ring electromagnetic testing unit, the phase shifter 14, the amplifier 13 and the frequency source 12 connected to the sub feed rf connector 4 of the complementary split resonant ring electromagnetic testing unit in sequence.
The invention discloses a detection method of a defect nondestructive detection system, which comprises the steps of firstly enabling a complementary split resonant ring electromagnetic detection unit to be close to a detection piece 15, and enabling a complementary split resonant ring electromagnetic structure 9 to keep a 0.1mm distance from the detection surface of the detection piece 15; then, the calibration of microwave nondestructive detection is carried out, the complementary split resonant ring electromagnetic structure 9 is placed at the position where the detection piece 15 has no defects, the amplifier 13 and the phase shifter 14 are adjusted, and the resonance peak f on the vector network analyzer 11 is observed1Change of (2), peak to be resonated f1The amplitude of the signal is less than-20 dB, and the calibration work is finished; starting to move the complementary split resonant ring electromagnetic detection unit in parallel, and keeping the distance between the complementary split resonant ring electromagnetic structure 9 and the detection piece 15 to be less than 0.1mm, if a resonant peak f on the vector network analyzer 11 is found1Obvious frequency deviation (more than 1MHz) appears, which indicates that the surface of the detection piece 15 has defects and marks the positions of the defects of the detection piece 15; the above operations are repeated to complete the detection of the defect of the detection member 15.

Claims (5)

1. A complementary split ring resonator electromagnetic detection unit, its characterized in that: the substrate integrated waveguide resonant cavity comprises a substrate, wherein a plurality of substrate integrated waveguide resonant cavity shielding through holes (10) formed in the substrate enclose a substrate integrated waveguide resonant cavity (5), a complementary split-ring electromagnetic structure (9) is arranged in the center of the substrate integrated waveguide resonant cavity (5), and the complementary split-ring electromagnetic structure (9) is two split rings which are nested and isolated from each other; one side of a substrate integrated waveguide resonant cavity (5) on the upper surface of the substrate is connected with a microstrip line (2) through a transition structure (3), the other side of the microstrip line (2) is connected with a main feed radio frequency connector (1), and a radio frequency connector grounding through hole (6) is formed around the main feed radio frequency connector (1), so that the electrical connection of an upper metal layer and a lower metal layer of the substrate is realized; the substrate integrated waveguide resonant cavity (5) on the lower surface of the substrate and one side adjacent to one side of the upper surface connected with the microstrip line (2) are connected with two coplanar waveguide central conductors (7), the two coplanar waveguide central conductors (7) and a coplanar waveguide gap (8) between the two coplanar waveguide central conductors form a coplanar waveguide transmission line with preset impedance, the other end of the coplanar waveguide transmission line is connected with a sub-feed radio frequency connector (4), a radio frequency connector grounding through hole (6) is formed around the sub-feed radio frequency connector (4), and the electrical connection of an upper metal layer and a lower metal layer of the substrate is realized; the main feed radio frequency connector (1) and the secondary feed radio frequency connector (4) are orthogonal and distributed on the upper surface and the lower surface of the substrate.
2. The complementary split ring resonator electromagnetic detection unit of claim 1, wherein: in the complementary split resonant ring electromagnetic structure (9), the length L4 of an inner ring is 1.2mm, the width L3 is 1mm, and the opening distance S2 is 0.6 mm; the outer ring length L2 is 2mm, the width L1 is 1.8mm, and the opening spacing S1 is 0.4 mm; the distance W between the outer ring and the inner ring of the split ring is 0.2 mm.
3. The complementary split ring resonator electromagnetic detection unit of claim 1, wherein: the substrate integrated waveguide resonant cavity (5) forms an approximately closed rectangular metal cavity through a plurality of substrate integrated waveguide resonant cavity shielding through holes (10) and metal layers on the upper surface and the lower surface of the substrate.
4. A defect non-destructive inspection system, comprising: comprising a complementary split-ring electromagnetic detection unit according to any one of claims 1 to 3, a vector network analyzer (11) connected to the main feed rf connection (1) of the complementary split-ring electromagnetic detection unit, a phase shifter (14), an amplifier (13) and a frequency source (12) connected in series to the sub-feed rf connection (4) of the complementary split-ring electromagnetic detection unit.
5. The method for inspecting a system for non-destructive inspection of defects according to claim 4, wherein: firstly, a complementary split ring electromagnetic detection unit is close to a detection piece (15), and a gap is reserved between a complementary split ring electromagnetic structure (9) and the detection surface of the detection piece (15); then, the calibration of microwave nondestructive detection is carried out, the complementary split resonant ring electromagnetic structure (9) is placed at the position where the detection piece (15) has no defects, the amplifier (13) and the phase shifter (14) are adjusted, and the resonant peak f on the vector network analyzer (11) is observed1Change of (2), peak to be resonated f1The amplitude of the signal is less than-20 dB, and the calibration work is finished; starting to move the complementary split resonant ring electromagnetic detection unit in parallel, keeping a gap between the complementary split resonant ring electromagnetic structure (9) and the detection piece (15), and if a resonant peak f on the vector network analyzer (11) is found1Obvious frequency deviation appears, which indicates that the surface of the detection piece (15) is defective, and the defective position of the detection piece (15) is marked; the above operations are repeated to complete the detection of the defects of the detection piece (15).
CN202111668287.1A 2021-12-31 2021-12-31 Complementary split resonant ring electromagnetic detection unit, detection system and detection method Pending CN114136999A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117907349A (en) * 2024-03-19 2024-04-19 成都信息工程大学 Portable material micro defect radio frequency detection system and detection method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117907349A (en) * 2024-03-19 2024-04-19 成都信息工程大学 Portable material micro defect radio frequency detection system and detection method
CN117907349B (en) * 2024-03-19 2024-05-24 成都信息工程大学 Portable material micro defect radio frequency detection system and detection method

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