CN220772987U - Magnetic tank eddy current sensor device - Google Patents
Magnetic tank eddy current sensor device Download PDFInfo
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- CN220772987U CN220772987U CN202321835922.5U CN202321835922U CN220772987U CN 220772987 U CN220772987 U CN 220772987U CN 202321835922 U CN202321835922 U CN 202321835922U CN 220772987 U CN220772987 U CN 220772987U
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Abstract
The utility model belongs to the technical field of nondestructive non-contact measuring devices, and particularly relates to a magnetic tank eddy current sensor device. Comprises a magnetic tank probe, an extension cable and a front-end processor; the magnetic tank probe comprises a magnetic tank body and a probe coil, wherein the magnetic tank body comprises a cylinder with an opening at the upper end, a cylindrical coil sleeve is arranged at the bottom of the cylinder, and a first through hole is formed in the center of the coil sleeve; the center of the probe coil is provided with a second through hole, and the coil sleeve can penetrate through the second through hole and is sleeved with the probe coil; two opposite ends of the side wall of the cylinder are provided with notches, and two wires on the probe coil extend out of the two notches of the cylinder respectively and are connected with the front device through extension cables; and a measured conductor is arranged at a certain distance a from the opening side of the magnetic tank probe, and the center of the measured conductor is opposite to the axis of the cylindrical coil sleeve. The utility model can improve the magnetic focusing capability of the magnetic tank and can obviously improve the sensitivity of the sensor eddy current sensor.
Description
Technical Field
The utility model belongs to the technical field of nondestructive non-contact measuring devices, and particularly relates to a magnetic tank eddy current sensor device.
Background
The eddy current sensor senses the target distance by using a magnetic field and mainly works by relying on the principle of eddy current effect. When a metal object is placed in a continuously changing magnetic field, induced current is generated in the object according to the definition of Faraday's law of electromagnetic induction. When the probe of the eddy current sensor generates an alternating magnetic field, the alternating magnetic field can form a current on the surface of the measured object, and the generated phenomenon is called an eddy current effect.
At present, the research of the eddy current sensor in China is greatly advanced in theory, structural design and material selection, but with the further development of practical application, the defects of the eddy current sensor are also developed, and the eddy current sensor mainly comprises four aspects:
firstly, the traditional eddy current sensor is very sensitive to the material of a detected body, the detection sensitivity of the same sensor to different materials is different, and the detection of the eddy current sensor is limited by the electromagnetic characteristics of the detected material due to the unique working principle, even if the same materials with different components are produced due to different production processes, the difference of detection output results is 5-10%, and the difference of detection result between different detected conductors can even reach 45%, so that the measuring instruments cannot be used mutually, and researchers need to spend a great deal of time and effort for data processing.
Secondly, the influence of the probe structure and the geometric parameters thereof is large, the limitation of the linear measurement range is that the measurement range of the eddy current sensor is smaller because the signal processing circuit and the eddy current benefit are nonlinear in nature, generally 1/5 to 1/3 of the diameter of the probe coil, and the application of the eddy current sensor is limited to a certain extent because the sensor with larger coil diameter can reach 1/2 of the coil diameter. The probe manufactured by the winding method has poor consistency, smaller inductance value and very small effect on the part of the coil far away from the measured object, so that the sensitivity and the quality factor of the sensor are reduced.
Thirdly, the eddy current sensor is easily affected by temperature, the stability and the reliability of the sensor are affected by temperature, the magnetic conductivity and the resistivity of the measured material are changed due to temperature change, dielectric loss and linear electromagnetic loss are increased when a ferromagnetic body or metal is used as a probe supporting frame at high temperature, thermal deformation is large, and temperature drift is also increased.
Fourth, at normal temperature, when the ferrite is used as a magnetic core, the magnetic field distribution is more concentrated, and the inductance value of the coil can be increased compared with the case without the magnetic core, so that the measurement range is enlarged.
Based on this, the present utility model has been made.
Disclosure of Invention
This section is intended to outline some aspects of embodiments of the utility model and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section as well as in the description summary and in the title of the application, to avoid obscuring the purpose of this section, the description summary and the title of the utility model, which should not be used to limit the scope of the utility model.
The utility model aims to provide a magnetic tank eddy current sensor device which solves the technical problems.
The utility model provides the following technical scheme:
a magnetic tank eddy current sensor device comprises a magnetic tank probe, an extension cable and a front-end processor; the method is characterized in that: the magnetic tank probe comprises a magnetic tank body and a probe coil, wherein the magnetic tank body comprises a cylinder with an opening at the upper end, a cylindrical coil sleeve is arranged at the bottom of the cylinder, and a first through hole is formed in the center of the coil sleeve; the center of the probe coil is provided with a second through hole, and the coil sleeve can penetrate through the second through hole and is sleeved with the probe coil; two opposite ends of the side wall of the cylinder are provided with notches, and two wires on the probe coil extend out of the two notches of the cylinder respectively and are connected with the front device through extension cables; and a measured conductor is arranged at a certain distance a from the opening side of the magnetic tank probe, and the center of the measured conductor is opposite to the axis of the cylindrical coil sleeve.
As a preferable technical scheme, the opening side of the magnetic tank probe is covered with a magnetic sheet, and the magnetic sheet is in the shape of a disc and is in contact with the probe coil.
As a preferable technical scheme, the diameter of the magnetic sheet is equal to the inner diameter of the cylinder.
As a preferred technical solution, the parameters of the cylinder are as follows: cylinder inner diameter r 2 18mm, cylinder outer diameter r 3 =21 mm; cylinder overall height H 0 Cylinder bottom thickness H =14 mm 2 ＝4mm。
As a preferred technical solution, the parameters of the coil sleeve are as follows: height H of the coil sleeve 1 Diameter D of through hole I =10mm 0 External diameter r of coil sleeve =6mm 1 ＝9mm。
As a preferred solution, the notch is directly connected to the bottom of the cylinder.
As a preferred solution, the width l=4mm of the notch at the outer wall of the cylinder.
As a preferable embodiment, a=0.5 to 7mm.
As a preferred technical scheme, the probe coil has an outer diameter r b =14mm, inner diameter r a 10mm, thickness h 8mm, wire diameter 0.3mm, and number of turns N90.
Compared with the prior art, the utility model has the following beneficial effects:
the utility model improves the probe manufactured by the traditional winding method into a magnetic tank probe, namely a probe coil is sleeved on a coil sleeve in the center of a magnetic tank body with one end open, and notches are arranged at two opposite ends of the side wall of the magnetic tank body; after full experimental verification, the optimal size and structure of the magnetic tank probe are determined; and the magnetic sheet capable of forming the annular notch is arranged on the magnetic tank body, so that the magnetic gathering capacity of the magnetic tank can be improved, and the sensitivity of the sensor eddy current sensor can be remarkably improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following detailed description will be given with reference to the accompanying drawings and detailed embodiments, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained from these drawings without inventive faculty for a person skilled in the art. Wherein:
FIG. 1 is a schematic diagram of a magnetic canister eddy current sensor apparatus in accordance with a preferred embodiment of the utility model;
FIG. 2 is a schematic view of a magnetic canister body according to a preferred embodiment of the utility model;
FIG. 3 is a top view of the magnetic canister body of the preferred embodiment of the utility model;
FIG. 4 is a side view of the magnet pot body of the preferred embodiment of the present utility model;
FIG. 5 is a graph of magnetic field patterns under a coil model of an eddy current sensor probe with a ferrite magnetic tank, a generally cylindrical magnetic core, and no magnetic core, respectively;
FIG. 6 is a graph of the current vortex pattern under the respective modeling of an eddy current sensor probe coil comprising a ferrite magnetic tank, a generally cylindrical magnetic core, and no magnetic core;
FIG. 7 is a graph of coil impedance versus lift-off distance a for an eddy current sensor probe coil model with a ferrite magnetic tank, a generally cylindrical magnetic core, and no magnetic core, respectively;
FIG. 8 is a graph of probe coil impedance versus lift-off distance a for different turns;
FIG. 9 is a graph of probe coil impedance versus lift-off distance a for different coil sleeve outer diameters;
FIG. 10 is a graph of probe coil impedance versus lift-off distance a for different cylinder inner diameters;
FIG. 11 is a graph of probe coil quality factor versus lift-off distance a for the same cylinder bore;
FIG. 12 is a schematic view of a magnet pot body with magnet pieces;
FIG. 13 is a graph showing the magnetic field distribution on a magnetic sheet with circular notches.
In the figure:
1. a magnetic tank body; 11. a cylinder; 12. a coil sleeve; 13. a first through hole; 14. a notch; 2. a probe coil; 3. extending the cable; 4. a conductor to be tested; 5. a front-end processor; 6. magnetic sheets.
Detailed Description
In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings.
Next, the present utility model will be described in detail with reference to the drawings, wherein the sectional view of the device structure is not partially enlarged to general scale for the convenience of description, and the drawings are only examples, which should not limit the scope of the present utility model. In addition, the three-dimensional dimensions of length, width and depth should be included in actual fabrication.
In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings.
Next, the present utility model will be described in detail with reference to the drawings, wherein the sectional view of the device structure is not partially enlarged to general scale for the convenience of description, and the drawings are only examples, which should not limit the scope of the present utility model. In addition, the three-dimensional dimensions of length, width and depth should be included in actual fabrication.
For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, embodiments of the present utility model will be described in further detail below with reference to the accompanying drawings.
Referring to fig. 1-4, the present utility model provides a magnetic tank eddy current sensor device, which comprises a magnetic tank probe, an extension cable 3 and a front end processor 5; the magnetic tank probe comprises a magnetic tank body 1 and a probe coil 2, wherein the magnetic tank body 1 comprises a cylinder 11 with an opening at the upper end, a cylindrical coil sleeve 12 is arranged at the bottom of the cylinder 11, and a first through hole 13 is formed in the center of the coil sleeve 12; the center of the probe coil 2 is provided with a through hole II, and the coil sleeve 12 can penetrate through the through hole II and is sleeved with the probe coil 2; notches 14 are formed at two opposite ends of the side wall of the cylinder 11, two wires on the probe coil 2 extend out of the two notches 14 of the cylinder 11 respectively and are connected with the pre-processor 5 through the extension cable 3, and the pre-processor 5 generally provides power required by the probe to amplify, detect, filter and the like signals.
At a certain distance a from the opening side of the magnetic tank probe, a conductor 4 to be measured is placed, and the center of the conductor 4 to be measured is opposite to the axis of the cylindrical coil sleeve 12. Preferably, a=0.5 to 7mm.
Preferably, the diameter D of the first through hole 13 0 =6mm, outer diameter r of coil sleeve 12 1 =9 mm, inner diameter r of cylinder 11 2 18mm, outer diameter r of cylinder 11 3 =21 mm; overall height H of cylinder 11 0 =14 mm, wherein: height H of coil sleeve 12 1 10mm, bottom thickness H of cylinder 11 2 The opening 14 of the cylinder 11 is open to the bottom of the cylinder 11, and the opening 14 has a width l=4mm at the outer wall of the cylinder 11.
Preferably, the probe coil 2 has an outer diameter r b =14mm, inner diameter r a 10mm, thickness h 8mm, wire diameter 0.3mm, and number of turns N90.
Preferably, the material of the magnetic tank body 1 is TP5 ferrite.
Preferably, the opening side of the magnetic pot probe is covered with a magnetic sheet 6, and the magnetic sheet 6 is in the shape of a disc, and is in contact with the probe coil 2, and the diameter of the disc is equal to the inner diameter of the cylinder 11.
The following uses finite element analysis software to perform performance verification on the above structures and parameters:
1. material comparison experiment of magnetic tank body 1
(1) And respectively establishing a model of the probe coil 2 of the eddy current sensor, which is free of a magnetic core, comprises a common cylindrical magnetic core and comprises a ferrite magnetic tank, wherein the radius of the common cylindrical magnetic core is 9mm, the height of the common cylindrical magnetic core is 10mm, and the magnetic core material is TP5 ferrite which is the same as that of the magnetic tank body 1. The three models are consistent in parameters except the magnetic core, the Z-axis coordinate of the measured conductor 4 is controlled to enable the distance a between the measured conductor 4 and the probe coil 2 to be changed, and solving and post-processing are respectively carried out to obtain magnetic field distribution, eddy current distribution, real part resistance of the coil and inductance.
As shown in fig. 5, the magnetic induction intensity in the model containing the ferrite magnetic tank is more concentrated than the magnetic field distribution without the magnetic core and with the common cylindrical magnetic core, which shows that the ferrite magnetic tank has obvious enhancement effect on the magnetic focusing capability of the coil. The magnetic field energy generated by the coil is partially used for magnetizing the magnetic core to enable the magnetic field distribution to be concentrated at the position of the magnetic core, the magnetic force lines of the coil without the magnetic core diverge to enable the magnetic field distribution to be wider, the relative maximum magnetic induction intensity is also minimum, and the magnetic field utilization rate is low. Compared with a common magnetic core, the coil of the magnetic tank surrounds the groove of the magnet, the contact area is larger, the magnetic circuit is closed, the magnetic field distribution is more concentrated, and the corresponding maximum magnetic induction intensity is higher.
As shown in fig. 6, the current density of the ferrite-containing model test conductor 4 is significantly higher than the current density of the non-magnetic core and the normal magnetic core, the distribution pattern of the eddy current induced in the test conductor 4 under the model of the eddy current sensor probe coil 2 without the magnetic core, the normal magnetic core and the ferrite-containing magnetic tank, the maximum values of the current densities of the non-magnetic core and the normal magnetic core-containing model test conductor 4 are 2.9x107A/m 2 and 3.5x107A/m 2, respectively, and the maximum value of the current density of the ferrite-containing model test conductor 4 is 5.2x107A/m 2, which is significantly higher than the former two, further explaining that the magnetic tank enhances the magnetic field generated by the coil.
2. Relation between probe coil 2 impedance and lift-off distance a under different models
As shown in fig. 7, the probe coil 2 impedance of the ordinary magnetic core model and the magnetic tank model significantly increases by an amount that changes with an increase in the lift-off distance a, and the slope is larger, that is, the sensitivity of the eddy current sensor detection is higher, as compared with the model without the magnetic core. The main reason is that the magnetic core is present to concentrate the magnetic field generated by the coil, the intensity of the magnetic field is increased, the eddy current induced on the tested conductor 4 is also enhanced, and the magnetic field generated by eddy current opposite to the original magnetic field is also increased, but the total magnetic flux passing through the coil is increased to increase the inductance value of the coil, the impedance change is more severe, and the sensitivity is improved. Compared with a common magnetic core, the magnetic tank has stronger magnetic gathering capability and larger magnetic field strength, and the sensitivity of the eddy current sensor is obviously improved. Therefore, the magnetic tank is used for replacing a common cylindrical magnetic core, and the performance of the eddy current sensor can be obviously improved in the aspect of detection sensitivity.
3. Effect of probe coil 2 turns on Eddy current sensor Performance
As shown in fig. 8, the more turns of the probe coil 2, the higher the sensor detection sensitivity, but the linear measurement range is reduced. Under the model of the magnetic tank containing ferrite, only the number of turns of the probe coil 2 is changed, and other parameters are unchanged, when the number of turns of the probe coil 2 is increased, the coil impedance is changed faster along with the lift-off distance, the sensitivity of the sensor is increased, but the curve of the change relation between the coil impedance and the lift-off distance is also obviously bent, and the linear measurement range is reduced, so that the higher the number of turns of the probe coil 2 is, the higher the sensitivity of the sensor is, and the better the detection performance is.
4. Influence of structural size of magnetic tank body 1 on sensitivity of eddy current sensor
As shown in fig. 9-11, the outer diameter r of the coil sleeve 12 1 Respectively 9mm, 8mm, 7mm and 6mm, and the other parameters are unchanged, and the R is found as 1 The curve changes significantly more severely with increasing sensitivity. In this model, the inner diameter r of the probe coil 2 a Since the thickness is 10mm, the sensitivity of the eddy current sensor is improved when the probe coil 2 is more tightly attached to the coil sleeve 12.
When the inner diameter r of the cylinder 11 2 The smaller the radius of the cylinder 11, the faster the coil impedance increases with increasing lift-off distance a, the higher the sensor sensitivity, found at 16mm,18mm,20mm, respectively. The coil quality factor increases with increasing lift-off distance a because the mutual inductance between the probe coil 2 and the measured conductor 4 decreases with increasing lift-off distance a, the coil resistance decreases and the inductance increases, the quality factor increases, and at the same time the same lift-off is performed when the lift-off distance a is greater than 3mmThe greater the coil quality factor at distance, the better the sensor performance. When the outer diameter of the probe coil 2 is 14mm, it is shown that the more the probe coil 2 occupies the coil sleeve 12, the higher the sensor sensitivity is, because the smaller the remaining space in the coil sleeve 12, the more concentrated the distribution of magnetic lines of force generated by the probe coil 2 is, and the smaller the loss of magnetic field energy is, so that a sensor with higher sensitivity can be obtained.
5. Influence of the size and shape of the magnetic sheet 6 on the sensitivity of the eddy current sensor
As shown in fig. 12 to 13, the larger the contact area between the probe coil 2 and the magnet pot body 1 is, the more the sensor sensitivity is facilitated, so the magnet sheet 6 can be regarded as a part of the magnet pot body 1; when the magnetic sheet 6 covers the magnetic tank, magnetic force lines generated by the coil can not overflow and diverge from the opening to be more concentrated, so that the performance of the sensor is improved. However, if the diameter of the magnetic sheet 6 is equal to the inner diameter of the cylinder 11, the opening is completely sealed, and the interaction relationship between the coil and the conductor 4 to be measured is weakened, which reduces the sensitivity.
When the diameter of the magnetic sheet 6 is equal to the inner diameter of the cylinder 11, the magnetic field distribution with the circular notch is formed between the two magnetic sheets, and as can be seen from fig. 13, the magnetic sheet 6 is in circular concentrated distribution, the maximum magnetic induction intensity can reach 0.6T, which is far higher than 0.04T of a model of the opening end face of the magnetic tank without using the magnetic sheet 6, further explaining that the magnetic sheet 6 with the circular notch 14 can improve the magnetic gathering capability of the magnetic tank, and can obviously improve the performance of the sensor.
Although the utility model has been described hereinabove with reference to embodiments, various modifications thereof may be made and equivalents may be substituted for elements thereof without departing from the scope of the utility model. In particular, the features of the disclosed embodiments may be combined with each other in any manner as long as there is no structural conflict, and the exhaustive description of these combinations is not given in this specification merely for the sake of omitting the descriptions and saving resources. Therefore, it is intended that the utility model not be limited to the particular embodiment disclosed, but that the utility model will include all embodiments falling within the scope of the appended claims.
Claims (9)
1. A magnetic tank eddy current sensor device comprises a magnetic tank probe, an extension cable and a front-end processor; the method is characterized in that: the magnetic tank probe comprises a magnetic tank body and a probe coil, wherein the magnetic tank body comprises a cylinder with an opening at the upper end, a cylindrical coil sleeve is arranged at the bottom of the cylinder, and a first through hole is formed in the center of the coil sleeve; the center of the probe coil is provided with a second through hole, and the coil sleeve can penetrate through the second through hole and is sleeved with the probe coil; two opposite ends of the side wall of the cylinder are provided with notches, and two wires on the probe coil extend out of the two notches of the cylinder respectively and are connected with the front device through extension cables;
and a measured conductor is arranged at a certain distance a from the opening side of the magnetic tank probe, and the center of the measured conductor is opposite to the axis of the cylindrical coil sleeve.
2. The magnetic canister eddy current sensor apparatus of claim 1, wherein: the magnetic sheet covers the opening side of the magnetic tank probe, and the magnetic sheet is in the shape of a disc and is contacted with the probe coil.
3. The magnetic canister eddy current sensor apparatus of claim 2, wherein: the diameter of the magnetic sheet is equal to the inner diameter of the cylinder.
4. The magnetic canister eddy current sensor apparatus of claim 1, wherein: the parameters of the cylinder are as follows: cylinder inner diameter r 2 18mm, cylinder outer diameter r 3 =21 mm; cylinder overall height H 0 Cylinder bottom thickness H =14 mm 2 ＝4mm。
5. The magnetic canister eddy current sensor apparatus of claim 1, wherein: the parameters of the coil sleeve are as follows: height H of the coil sleeve 1 Diameter D of through hole I =10mm 0 External diameter r of coil sleeve =6mm 1 ＝9mm。
6. The magnetic canister eddy current sensor apparatus of claim 1, wherein: the notch is directly connected with the bottom of the cylinder.
7. The magnetic canister eddy current sensor apparatus of claim 1, wherein: the width l=4mm of the notch at the outer wall of the cylinder.
8. The magnetic canister eddy current sensor apparatus of claim 1, wherein: a=0.5 to 7mm.
9. The magnetic canister eddy current sensor apparatus of claim 1, wherein: the outer diameter r of the probe coil b =14mm, inner diameter r a 10mm, thickness h 8mm, wire diameter 0.3mm, and number of turns N90.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202321835922.5U CN220772987U (en) | 2023-07-12 | 2023-07-12 | Magnetic tank eddy current sensor device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202321835922.5U CN220772987U (en) | 2023-07-12 | 2023-07-12 | Magnetic tank eddy current sensor device |
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| CN220772987U true CN220772987U (en) | 2024-04-12 |
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| CN202321835922.5U Active CN220772987U (en) | 2023-07-12 | 2023-07-12 | Magnetic tank eddy current sensor device |
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