CN103954654A - Method for detecting discontinuity of nonmetal material by virtue of inductance of series resonant circuit - Google Patents
Method for detecting discontinuity of nonmetal material by virtue of inductance of series resonant circuit Download PDFInfo
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- CN103954654A CN103954654A CN201410199816.1A CN201410199816A CN103954654A CN 103954654 A CN103954654 A CN 103954654A CN 201410199816 A CN201410199816 A CN 201410199816A CN 103954654 A CN103954654 A CN 103954654A
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- resonant circuit
- series resonant
- nonmetallic materials
- telefault
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Abstract
The invention provides a method for detecting discontinuity of a nonmetal material by virtue of inductance of a series resonant circuit. The method has the beneficial effects that the discontinuity of the nonmetal material is detected by virtue of an inductance coil in a series resonant circuit device based on an electromagnetic principle, and the limitation of a current nondestructive testing theory is broken through by virtue of the characteristic that the resonant frequency of the series resonant circuit is changed due to the changing of a medium in the inductance coil in the series resonant circuit; by applying the electromagnetic detection method to the detection on the discontinuity of the nonmetal material, the automatic detection is easy to implement, and the efficiency and precision of detection on the discontinuity of the nonmetal material are improved.
Description
A?method?to?test?discontinuity?of?nonmetallic?material?through?the?inductance?of?series?resonance?circuit
Affiliated technical field
The present invention relates to a kind of lossless detection method, particularly relate to a kind of method of series resonant circuit inductance detection nonmetallic materials uncontinuity.
Background technology
For the discontinuity detecting technique of nonmetallic materials, the lossless detection method adopting at present has the detection methods such as acoustics, mechanics, ray.Electromagnetic nondestructive method is at present only for the discontinuity detecting technique of metal material.Compared with the detection methods such as electromagnetic detection and acoustics, mechanics, ray, have that accuracy of detection is high, detection speed fast, easily be automated the advantages such as detection, wherein resonant circuit has high detection sensitivity.
Summary of the invention
The object of the invention is to overcome the deficiency of prior art, a kind of method of series resonant circuit inductance detection nonmetallic materials uncontinuity is provided, based on electromagnetics principle, adopt the uncontinuity of the telefault detection nonmetallic materials in series resonant circuit device.
The technical solution adopted for the present invention to solve the technical problems is: a kind of method of series resonant circuit inductance detection nonmetallic materials uncontinuity, telefault in employing series resonant circuit device is as the detecting sensor that detects nonmetallic materials uncontinuity, and tested nonmetallic materials can axially be passed in telefault; According to inductance value formula
l=
μ 0 μ r n 2 a/l, the inductance value of telefault
lrelative permeability with medium in telefault
μ r relevant, and the relative dielectric constant of medium
μ r relative dielectric constant with medium
ε r relevant, calculate formula according to series resonant circuit resonance frequency
f 0 =1/ (2
π(
lC)
1/2) known, the resonance frequency of series resonant circuit
f 0relative dielectric constant with the medium in telefault
ε r relevant, when occurring in medium when discontinuous, the relative dielectric constant of medium
ε r to change, cause the resonance frequency of series resonant circuit
f 0change, utilize this characteristic of series resonant circuit, detect the uncontinuity of nonmetallic materials,
Detecting step comprises to be demarcated and two parts of actual measurement,
Calibration process is,
A. standard nonmetallic materials are inserted in telefault, the medium in telefault becomes standard nonmetallic materials, described standard nonmetallic materials be have material identical with tested nonmetallic materials and shape without discontinuous intact nonmetallic materials;
B. regulate the excitation frequency of the excitation power supply in series resonant circuit device, in the time that excitation frequency equals the resonance frequency of series resonant circuit, series resonant circuit generation resonance, the total current of series resonant circuit reaches maximal value;
C. excitation frequency when series resonant circuit generation resonance preserved in record and the total current of series resonant circuit, be recorded as respectively and demarcate excitation frequency and demarcate total current;
Actual measurement process is,
D. tested nonmetallic materials are inserted in telefault, medium in telefault becomes tested nonmetallic materials, excitation power supply in series resonant circuit device adopts demarcates excitation frequency excitation series resonant circuit, now, if series resonant circuit generation resonance, illustrate that now the resonance frequency of series resonant circuit is identical with demarcation excitation frequency, the total current of series resonant circuit equals to demarcate total current, judge that thus the tested nonmetallic materials in telefault are identical with demarcation nonmetallic materials, without discontinuous; If there is not resonance in series resonant circuit, illustrate that now the resonance frequency of series resonant circuit is different from demarcation excitation frequency, the total current of series resonant circuit is less than demarcation total current, judge thus in the tested nonmetallic materials in telefault, exist discontinuous.
The invention has the beneficial effects as follows, a kind of method of series resonant circuit inductance detection nonmetallic materials uncontinuity is provided, based on electromagnetics principle, adopt the uncontinuity of the telefault detection nonmetallic materials in series resonant circuit device, break through the theoretical restriction of current Non-Destructive Testing, electromechanical detection method is applied in the discontinuity detecting technique of nonmetallic materials, easily is automated detection, improved detection efficiency and the accuracy of detection of nonmetallic materials uncontinuities.
Below in conjunction with embodiment, the present invention is described in further detail, but the method for a kind of series resonant circuit inductance detection nonmetallic materials uncontinuity of the present invention is not limited to embodiment.
Brief description of the drawings
Below in conjunction with drawings and Examples, the present invention is further described.
Fig. 1 is the schematic diagram of the series resonant circuit inductance detection nonmetallic materials uncontinuity of the embodiment of the present invention.
In figure, L. telefault, C. electric capacity, R. resistance, V. excitation power supply, the tested nonmetallic materials of A..
Embodiment
In the embodiment shown in fig. 1, a kind of method of series resonant circuit inductance detection nonmetallic materials uncontinuity, telefault L in employing series resonant circuit device is as the detecting sensor that detects nonmetallic materials uncontinuity, and tested nonmetallic materials A can axially pass in telefault L; According to inductance value formula
l=
μ 0 μ r n 2 a/l, the inductance value of telefault
lrelative permeability with medium in telefault
μ r relevant, and the relative dielectric constant of medium
μ r relative dielectric constant with medium
ε r relevant, calculate formula according to series resonant circuit resonance frequency
f 0 =1/ (2
π(
lC)
1/2) known, the resonance frequency of series resonant circuit RLC
f 0relative dielectric constant with the medium in telefault L
ε r relevant, when occurring in medium when discontinuous, the relative dielectric constant of medium
ε r to change, cause the resonance frequency of series resonant circuit RLC
f 0change, utilize this characteristic of series resonant circuit RLC, detect the uncontinuity of nonmetallic materials,
Detecting step comprises to be demarcated and two parts of actual measurement,
Calibration process is,
A. standard nonmetallic materials are inserted in telefault L, the medium in telefault L becomes standard nonmetallic materials, described standard nonmetallic materials be have material identical with tested nonmetallic materials A and shape without discontinuous intact nonmetallic materials;
B. regulate the excitation frequency of the excitation power supply V in series resonant circuit device, in the time that excitation frequency equals the resonance frequency of series resonant circuit RLC, there is resonance in series resonant circuit RLC, and the total current of series resonant circuit RLC reaches maximal value;
C. excitation frequency when series resonant circuit RLC generation resonance preserved in record and the total current of series resonant circuit RLC, be recorded as respectively and demarcate excitation frequency and demarcate total current;
Actual measurement process is,
D. tested nonmetallic materials A is inserted in telefault L, medium in telefault L becomes tested nonmetallic materials A, excitation power supply V in series resonant circuit device adopts and demarcates excitation frequency excitation series resonant circuit RLC, now, if there is resonance in series resonant circuit RLC, illustrate that now the resonance frequency of series resonant circuit is identical with demarcation excitation frequency, the total current of series resonant circuit RLC equals to demarcate total current, judge that thus the tested nonmetallic materials A in telefault L is identical with demarcation nonmetallic materials, without discontinuous; If there is not resonance in series resonant circuit RLC, illustrate that now the resonance frequency of series resonant circuit is different from demarcation excitation frequency, the total current of series resonant circuit RLC is less than demarcation total current, judge thus in the tested nonmetallic materials A in telefault L, exist discontinuous.
Above-described embodiment is only used for further illustrating the method for a kind of series resonant circuit inductance detection nonmetallic materials uncontinuity of the present invention; but invention is not limited to embodiment; any simple modification, equivalent variations and modification that every foundation technical spirit of the present invention is done above embodiment, all fall in the protection domain of technical solution of the present invention.
Claims (1)
1. the method for a series resonant circuit inductance detection nonmetallic materials uncontinuity, it is characterized in that: the telefault in employing series resonant circuit device is as the detecting sensor that detects nonmetallic materials uncontinuity, and tested nonmetallic materials can axially be passed in telefault; According to inductance value formula
l=
μ 0 μ r n 2 a/l, the inductance value of telefault
lrelative permeability with medium in telefault
μ r relevant, and the relative dielectric constant of medium
μ r relative dielectric constant with medium
ε r relevant, calculate formula according to series resonant circuit resonance frequency
f 0 =1/ (2
π(
lC)
1/2) known, the resonance frequency of series resonant circuit
f 0relative dielectric constant with the medium in telefault
ε r relevant, when occurring in medium when discontinuous, the relative dielectric constant of medium
ε r to change, cause the resonance frequency of series resonant circuit
f 0change, utilize this characteristic of series resonant circuit, detect the uncontinuity of nonmetallic materials,
Detecting step comprises to be demarcated and two parts of actual measurement,
Calibration process is,
A. standard nonmetallic materials are inserted in telefault, the medium in telefault becomes standard nonmetallic materials, described standard nonmetallic materials be have material identical with tested nonmetallic materials and shape without discontinuous intact nonmetallic materials;
B. regulate the excitation frequency of the excitation power supply in series resonant circuit device, in the time that excitation frequency equals the resonance frequency of series resonant circuit, series resonant circuit generation resonance, the total current of series resonant circuit reaches maximal value;
C. excitation frequency when series resonant circuit generation resonance preserved in record and the total current of series resonant circuit, be recorded as respectively and demarcate excitation frequency and demarcate total current;
Actual measurement process is,
D. tested nonmetallic materials are inserted in telefault, medium in telefault becomes tested nonmetallic materials, excitation power supply in series resonant circuit device adopts demarcates excitation frequency excitation series resonant circuit, now, if series resonant circuit generation resonance, illustrate that now the resonance frequency of series resonant circuit is identical with demarcation excitation frequency, the total current of series resonant circuit equals to demarcate total current, judge that thus the tested nonmetallic materials in telefault are identical with demarcation nonmetallic materials, without discontinuous; If there is not resonance in series resonant circuit, illustrate that now the resonance frequency of series resonant circuit is different from demarcation excitation frequency, the total current of series resonant circuit is less than demarcation total current, judge thus in the tested nonmetallic materials in telefault, exist discontinuous.
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| CN201410199816.1A CN103954654B (en) | 2014-05-13 | 2014-05-13 | A kind of method of series resonant circuit inductance detection nonmetallic materials discontinuity |
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| CN201410199816.1A CN103954654B (en) | 2014-05-13 | 2014-05-13 | A kind of method of series resonant circuit inductance detection nonmetallic materials discontinuity |
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| CN103954654B CN103954654B (en) | 2016-06-22 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105300853A (en) * | 2015-11-24 | 2016-02-03 | 大连海事大学 | Series resonance type oil liquid metal particle measurement apparatus and series resonance type oil liquid metal particle measurement method |
| CN110653176A (en) * | 2019-10-30 | 2020-01-07 | 爱德森（厦门）电子有限公司 | Discontinuous online dynamic electromagnetic sorting method for non-metal parts |
Citations (5)
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| EP0330495A2 (en) * | 1988-02-26 | 1989-08-30 | R.J. Reynolds Tobacco Company | Package inspection system |
| CN1924568A (en) * | 2006-09-22 | 2007-03-07 | 清华大学 | Resonance eddy detection method for surface crack |
| CN102230914A (en) * | 2011-03-31 | 2011-11-02 | 厦门安锐捷电子科技有限公司 | Electromagnetic resonance-based nondestructive testing method for metal material |
| CN102730245A (en) * | 2012-06-29 | 2012-10-17 | 昆明展华科技有限公司 | Packing defect detecting device and detecting method for boxed cigarettes |
| CN102917483A (en) * | 2012-06-07 | 2013-02-06 | 杨蒙 | Electromagnetic induction heating device |
-
2014
- 2014-05-13 CN CN201410199816.1A patent/CN103954654B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0330495A2 (en) * | 1988-02-26 | 1989-08-30 | R.J. Reynolds Tobacco Company | Package inspection system |
| CN1924568A (en) * | 2006-09-22 | 2007-03-07 | 清华大学 | Resonance eddy detection method for surface crack |
| CN102230914A (en) * | 2011-03-31 | 2011-11-02 | 厦门安锐捷电子科技有限公司 | Electromagnetic resonance-based nondestructive testing method for metal material |
| CN102917483A (en) * | 2012-06-07 | 2013-02-06 | 杨蒙 | Electromagnetic induction heating device |
| CN102730245A (en) * | 2012-06-29 | 2012-10-17 | 昆明展华科技有限公司 | Packing defect detecting device and detecting method for boxed cigarettes |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105300853A (en) * | 2015-11-24 | 2016-02-03 | 大连海事大学 | Series resonance type oil liquid metal particle measurement apparatus and series resonance type oil liquid metal particle measurement method |
| CN105300853B (en) * | 2015-11-24 | 2018-07-10 | 大连海事大学 | A kind of serial-resonant fluid metallic particles measuring device and its measuring method |
| CN110653176A (en) * | 2019-10-30 | 2020-01-07 | 爱德森（厦门）电子有限公司 | Discontinuous online dynamic electromagnetic sorting method for non-metal parts |
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| CN103954654B (en) | 2016-06-22 |
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