CN210090365U - Metal crack detection system - Google Patents
Metal crack detection system Download PDFInfo
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- CN210090365U CN210090365U CN201920383686.5U CN201920383686U CN210090365U CN 210090365 U CN210090365 U CN 210090365U CN 201920383686 U CN201920383686 U CN 201920383686U CN 210090365 U CN210090365 U CN 210090365U
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- 239000002184 metal Substances 0.000 title claims abstract description 56
- 238000001514 detection method Methods 0.000 title claims description 20
- 238000004891 communication Methods 0.000 claims abstract description 5
- 229910010293 ceramic material Inorganic materials 0.000 claims description 4
- 230000010287 polarization Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009659 non-destructive testing Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
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Abstract
The utility model provides a metal crack detecting system, wherein, this system includes: the system comprises a resonator, an antenna, a network analyzer and a computer terminal; the resonator is arranged on the metal sample with the crack; the antenna is opposite to the resonator; the antenna, the network analyzer and the computer terminal are sequentially in communication connection; the antenna is used for transmitting signals to the resonator, the network analyzer is used for measuring S11 parameters of the reflected signals received by the antenna, and the computer terminal is used for determining the resonant frequency of the resonator according to the S11 parameters so as to determine the crack depth of the metal sample. Because the utility model discloses a syntonizer and antenna remove the crack depth who detects the metal, do not need the electronic circuit, and entire system structure is retrencied, and convenient operation can work in extreme industrial environment.
Description
Technical Field
The utility model relates to a metal component detection area especially relates to a metal crack detecting system.
Background
The metal member is a material widely used in equipment in various fields at present. The occurrence of cracks is an unavoidable condition of metal components because of their long service life, long exposure to the open air environment and frequent stress and corrosion effects.
Therefore, the detection of the crack depth of the metal has become an important research issue. In the prior art, in order to realize nondestructive detection of the depth of a metal crack, the used equipment is heavy and large in size, long in detection period and huge in cost.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a metal crack detecting system for in the nondestructive test method of solving traditional metal crack degree of depth, the heavy size of equipment that uses is great, the detection cycle that causes is long and the huge technical problem of cost.
The utility model provides a metal crack detecting system, include: the system comprises a resonator, an antenna, a network analyzer and a computer terminal;
the resonator is arranged on a metal sample with cracks;
the antenna is opposite to the resonator;
the antenna, the network analyzer and the computer terminal are sequentially in communication connection;
the antenna is used for transmitting signals to the resonator, the network analyzer is used for measuring S11 parameters of reflected signals received by the antenna, and the computer terminal is used for determining the resonant frequency of the resonator according to the S11 parameters so as to determine the crack depth of the metal sample.
Preferably, the operating band of the antenna covers a preset offset range of the resonant frequency of the resonator.
Preferably, the operating mode of the resonator is HEM11δMode(s).
Preferably, the resonator is cylindrical.
Preferably, the flaw of the metal specimen coincides with a diameter of the resonator, and a polarization direction of the antenna is orthogonal to a direction of the flaw.
Preferably, the height of the resonator ranges from 8mm to 10mm, and the diameter of the resonator ranges from 22mm to 26 mm.
Preferably, the resonator is a ceramic material.
Preferably, the relative dielectric constant of the resonator ranges from 85 to 93, and the loss tangent of the resonator ranges from 0.00005 to 0.00008.
According to the technical solution provided by the utility model, the embodiment of the utility model has the following advantage:
the utility model provides a metal crack detecting system, this system includes: the system comprises a resonator, an antenna, a network analyzer and a computer terminal; the resonator is arranged on the metal sample with the crack; the antenna is opposite to the resonator; the antenna, the network analyzer and the computer terminal are sequentially in communication connection; the antenna is used for transmitting signals to the resonator, the network analyzer is used for measuring S11 parameters of the reflected signals received by the antenna, and the computer terminal is used for determining the resonant frequency of the resonator according to the S11 parameters so as to determine the crack depth of the metal sample. Because the utility model discloses a syntonizer and antenna remove the crack depth who detects the metal, do not need the electronic circuit, and entire system structure is retrencied, and convenient operation can work in extreme industrial environment.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of an embodiment of a metal crack detection system provided by the present invention;
FIG. 2 is a graph of the change in the S11 parameter of the antenna with the resonator on a crack;
FIG. 3 is a graph of resonant frequency versus crack depth for a resonator;
fig. 4 is another schematic structural diagram of an embodiment of a metal crack detection system provided by the present invention.
Detailed Description
The embodiment of the utility model discloses metal crack detecting system for in the nondestructive test method of solving traditional metal crack degree of depth, the heavy size of equipment that uses is great, the detection cycle that causes is long and the huge technical problem of cost.
Referring to fig. 1, an embodiment of a metal crack detection system according to the present invention includes: the device comprises a resonator 1, an antenna 2, a network analyzer 3 and a computer terminal 4;
the resonator 1 is arranged on a metal sample 5 with cracks, and the two can be generally tightly attached;
the antenna 2 is opposite to the resonator 1;
the antenna 2, the network analyzer 3 and the computer terminal 4 are sequentially in communication connection;
the antenna 2 is used for transmitting signals to the resonator 1, the network analyzer 3 is used for measuring S11 parameters of reflected signals received by the antenna, and the computer terminal 4 is used for determining the resonant frequency of the resonator 1 according to the S11 parameters so as to determine the crack depth of the metal sample 5. Because the utility model discloses a syntonizer and antenna remove the crack depth who detects the metal, do not need the electronic circuit, and entire system structure is retrencied, and convenient operation can work in extreme industrial environment.
It will be right below that the utility model provides a pair of metal crack detecting system's work flow introduces:
(1) determining the crack depth of a metal sample to be tested below the resonator, for example, taking the metal sample to be tested without cracks as a first test sample, namely d is 0 mm;
(2) controlling an antenna to transmit a signal to the resonator through a network analyzer;
(3) measuring an S11 parameter of a reflected signal received by the antenna through a network analyzer;
(4) acquiring an S11 parameter in the network analyzer through a computer terminal, and then determining the resonant frequency of the resonator according to the S11 parameter, as shown in fig. 2, since the crack depth of the current test sample is a curve with d being 0mm, that is, d being 0mm, the frequency corresponding to the right-hand valley point on the curve can be determined to be the resonant frequency of the resonator;
(5) replacing a new metal sample to be tested, namely replacing the sample to be tested with d being 0mm with the sample to be tested with d being 1mm, and then re-executing the steps (1) to (5) until the crack depth and the resonant frequency of a preset group number are obtained, namely the resonant frequency of the resonator corresponding to d being 0, 1, 2, 3, 4 and 5mm …;
(6) determining the relation between the crack depth and the resonant frequency through a computer terminal in the multiple groups of crack depths and resonant frequencies, as shown in FIG. 3;
(7) obtaining a target metal sample to be detected in an actual environment, replacing the target metal sample with the metal sample to be detected, and executing the steps (2) to (5) to obtain a resonant frequency corresponding to the target metal sample;
(8) and determining the crack depth of the target metal sample in the relation of fig. 3 according to the corresponding resonance frequency of the target metal sample.
Further, the operating band of the antenna 2 (a linearly polarized antenna may be selected) covers a preset shift range of the resonance frequency of the resonator 1. It can be understood that, since the relationship between the crack depth of the metal and the resonant frequency of the resonator needs to be determined first, and the resonant frequency of the resonator generally changes with the change of the crack depth, the operating band of the antenna 2 needs to cover the preset offset range of the resonant frequency of the resonator 1, and it should be noted that the preset offset range may be set in advance, that is, in the process of determining the relationship between the crack depth of the metal and the resonant frequency of the resonator, the preset offset range needs to be not less than the difference between the minimum value and the maximum value of the resonant frequency.
Further, the resonator 1 is cylindrical and the mode of operation of the resonator 1 is HEM11δMode(s). Since the operation mode of the resonator 1 is determined, the calculation formula of the initial resonance frequency of the resonator 1 in the operation mode is:
wherein c is0Is the speed of light,. epsilonrR and h are the radius and height, respectively, of the cylindrical resonator for the relative dielectric constant of the dielectric resonator 1. It should be noted that the initial resonant frequency of the resonator (which may be typically determined to be around 1.3 GHz) may be determined according to the accuracy of the crack depth desired by the user, and once the initial resonant frequency is determined, appropriate resonator parameters, i.e., height, radius, and relative dielectric constant, may be selected.
Furthermore, in order to make the difference between the resonant frequency points of the resonator at two different crack depths sufficiently obvious, the crack of the metal sample may be generally overlapped with the diameter of the resonator 1, and the polarization direction of the antenna 2 is orthogonal to the trend of the crack, as shown in fig. 4, the feed port 21 of the antenna 2 is connected with the network analyzer 3, and is used for receiving the signal sent by the network analyzer 3, and further sending out the signal.
Further, in general, the resonator 1 may be a ceramic material. And because the initial resonant frequency of the resonator 1 is determined, the height of the resonator 1 generally ranges from 8mm to 10mm, the diameter of the resonator 1 generally ranges from 22mm to 26mm, the relative dielectric constant of the resonator 1 ranges from 85 mm to 93 mm, and the loss tangent of the resonator 1 ranges from 0.00005 to 0.00008. In the above selection range, the most preferable embodiment may be a cylinder with a radius r of 12mm and a height h of 9mm, and the selected material is a resonator made of a ceramic material with a dielectric constant of 90.
The utility model discloses the principle is through utilizing dielectric resonator to receive reflected signal' S energy at resonance point resonance absorbed power, influence measuring antenna, consequently changes through the S parameter who observes measuring antenna, can confirm syntonizer resonant frequency. When the dielectric resonator is positioned above the cracks with different sizes, the resonance point can be changed, and the depth of the cracks can be obtained by observing the resonance frequency of the resonator. In addition, the method only needs to place the dielectric resonator on the surface of the crack, so that the purpose of nondestructive testing is achieved. Moreover, the dielectric resonator works in a mode, so that the interference of the environmental metal environment is effectively overcome; in addition, the dielectric resonator adopts a high dielectric constant material, so that higher gain is kept, and a low loss tangent material is used, so that the bandwidth is reduced, and the detection sensitivity is increased. Also, the dielectric resonator can operate in harsh environments (e.g., high temperatures) because no electronic circuitry is required. Therefore, the utility model discloses have nondestructive, simplicity and accuracy nature.
It is right above the utility model provides a metal crack detecting system has carried out detailed introduction, to the general technical personnel in this field, the foundation the utility model discloses the thought of embodiment all has the change part on concrete implementation and application scope, to sum up, this description content should not be understood as right the utility model discloses a restriction.
Claims (8)
1. A metal crack detection system, comprising: the system comprises a resonator, an antenna, a network analyzer and a computer terminal;
the resonator is arranged on a metal sample with cracks;
the antenna is opposite to the resonator;
the antenna, the network analyzer and the computer terminal are sequentially in communication connection;
the antenna is used for transmitting signals to the resonator, the network analyzer is used for measuring S11 parameters of reflected signals received by the antenna, and the computer terminal is used for determining the resonant frequency of the resonator according to the S11 parameters so as to determine the crack depth of the metal sample.
2. The metal crack detection system of claim 1, wherein the operating band of the antenna covers a preset shift range of the resonant frequency of the resonator.
3. The metal crack detection system of claim 2, wherein the resonator has an operating mode of HEM11δMode(s).
4. The metal crack detection system of claim 3, wherein the resonator is cylindrical.
5. The metal crack detection system of claim 4, wherein the crack of the metal specimen coincides with a diameter of the resonator and a polarization direction of the antenna is orthogonal to a direction of the crack.
6. The metal crack detection system of claim 5, wherein the height of the resonator ranges from 8mm to 10mm, and the diameter of the resonator ranges from 22mm to 26 mm.
7. The metal crack detection system of claim 6, wherein the resonator is a ceramic material.
8. The metal crack detection system of claim 7, wherein the relative dielectric constant of the resonator is in a range of 85 to 93, and the loss tangent of the resonator is in a range of 0.00005 to 0.00008.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920383686.5U CN210090365U (en) | 2019-03-25 | 2019-03-25 | Metal crack detection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920383686.5U CN210090365U (en) | 2019-03-25 | 2019-03-25 | Metal crack detection system |
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| CN210090365U true CN210090365U (en) | 2020-02-18 |
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| CN201920383686.5U Expired - Fee Related CN210090365U (en) | 2019-03-25 | 2019-03-25 | Metal crack detection system |
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Cited By (1)
| 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 |
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2019
- 2019-03-25 CN CN201920383686.5U patent/CN210090365U/en not_active Expired - Fee Related
Cited By (1)
| 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 |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200218 |