CN105823493A - Sensitivity enhancement type eddy current transducer - Google Patents
Sensitivity enhancement type eddy current transducer Download PDFInfo
- Publication number
- CN105823493A CN105823493A CN201610140189.3A CN201610140189A CN105823493A CN 105823493 A CN105823493 A CN 105823493A CN 201610140189 A CN201610140189 A CN 201610140189A CN 105823493 A CN105823493 A CN 105823493A
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- coil
- magnetic core
- eddy current
- current sensor
- sensitivity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
- G01D5/20—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
- G01D5/2006—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the self-induction of one or more coils
- G01D5/2013—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the self-induction of one or more coils by a movable ferromagnetic element, e.g. a core
Abstract
The invention relates to a sensitivity enhancement type eddy current transducer comprising a coil assembly, a circuit board (5), a transmission cable (7), and a joint (8). The units are successively connected. The coil assembly includes a shield (1), a magnetic core (4), and a coil (3), wherein the magnetic core (4) and the coil (3) are arranged in the shield (1); the magnetic core (4) is a rotator magnetic core with a T-shaped axial section; the coil (3) is a hollow cylindrical coil; a small end of the magnetic core (4) is inserted into the cavity of the coil (3) and a large end of the magnetic core (4) is abutted against the end surface of the coil (3); and the coil (3) and the circuit board (5) are connected. Compared with the prior art, the T-shaped magnetic core is employed and the electrical resistivity is high; and the large end of the T-shaped magnetic core plays a role in reflection enhancement for an alternating electromagnetic field, so that coupling between the transducer and a measured body is increased and thus the sensitivity is improved and the sensing distance is extended.
Description
Technical field
The present invention relates to measure and sensory field, relate to a kind of current vortex sensor, especially relate to a kind of sensitivity reinforced electric eddy current sensor.
Background technology
Current vortex sensor is a kind of sensor based on electromagnetic induction principle, and it is widely used in the multiple physical quantity of non-cpntact measurement metallic conductor, such as displacement, thickness, rotating speed, vibration etc., it is possible to be applied to measurement and the nondestructive inspection of material electric conductivity characteristic.Typical current vortex sensor has a unicoil form, sensor only one of which coil, and it passes to exciting current, and space produces alternating magnetic field around.The reception of signal can use excitation coil itself, it is also possible to other Magnetic Sensor, such as Hall element or giant magneto-resistance sensor etc..
In order to improve sensitivity and the detecting distance of current vortex sensor, generally there are two kinds of approach: a kind of approach is to use flat coil and increase coil diameter, " design of big displacement current vortex sensor " (instrumental technique and sensor that such as Yang Li tramples, Liu Jiaxin, Gao Songwei, Wang Junfeng, Xie Ling propose, 2009 (2): 11-12), this approach has a problem in that sensor bulk is bigger.Another approach is to use magnetic core, including cylindrical magnetic core and pot core.Such as, Yu Yating, Du Pingan are at " the Eddy current sensor coil impedance theory model containing FERRITE CORE and numerical computations " (Chinese journal of scientific instrument, 2007,28 (12): 2268-2273) cylindrical magnetic core that uses proposed in can improve the sensitivity of sensor, but suitable when its detecting distance and air core coil, improvement effect is limited.For another example, Liu Yizhu, Zhou Xiaochuan are at " Coin validator sensor coil parameter designing and improvement " (magnetic material and device, 2010 (6): 57-60) current vortex sensor of the employing pot core proposed in, magnetic loop can be limited in less scope by this form, thus reduce the detection range of sensor, but it is suitable only for the special occasions varied less as this lift-off such as coin recognizing method.
Summary of the invention
Defect that the purpose of the present invention is contemplated to overcome above-mentioned prior art to exist and a kind of sensitivity reinforced electric eddy current sensor is provided, can effectively strengthen sensitivity and detection range.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of sensitivity reinforced electric eddy current sensor, including the coil block being sequentially connected with, circuit board, transmission cable and joint, described coil block includes guard shield and the magnetic core being arranged in guard shield and coil, described magnetic core be shaft section be the rotary body magnetic core of T-shaped, described coil is open column shape coil, described magnetic core small end inserts in the cavity of coil, and the big end of magnetic core abuts against with coil end face, and described coil is connected with circuit board.
The ratio of described magnetic core outside diameter and end diameter is 2～4:1.
Described magnetic core small end height is 2～5:1 with the ratio of big end height.
Described magnetic core outside diameter is more than or equal to the external diameter of coil.
The material of described magnetic core includes ferrite.
Also including shell, this shell includes receiving chamber and the lead-in wire chamber being connected, and described coil block and circuit board are arranged at receiving intracavity, and described transmission cable one end is connected with circuit board, and the other end is connected through lead-in wire chamber with joint.
Described guard shield and shell are made by nonmetallic materials.
It is additionally provided with sheath outside described guard shield.
Described sheath is made up of nonmetallic materials.
Described transmission cable is three-core shielding cable.
Compared with prior art, the invention have the advantages that
(1) magnetic core of the present invention is rotary body, and its shaft section is T-shaped, and it is made up of the material (such as ferrite) that resistivity is higher.T-shaped magnetic core, compared with cylinder shape magnetic core, enhances the upper surface reflection to alternating magnetic field so that couple increase between sensor with measured body, thus the current vortex sensor implemented according to the present invention has higher sensitivity and farther detection range.
(2) the composite can be widely applied to electrical conductivity test, nondestructive inspection and the measurement of multiple mechanical-physical amount (such as displacement, vibration, rotating speed etc.).
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the core structure schematic diagram of the present invention；
Fig. 3 is the top view of Fig. 2；
Fig. 4 is the loop construction schematic diagram of the present invention；
Fig. 5 is the top view of Fig. 4；
Fig. 6 is the electrical connection diagram of the current vortex sensor of the present invention.
Description of symbols in figure:
1, guard shield, 2, sheath, 3, coil, 4, magnetic core, 5, internal circuit board, 6, shell, 61, accommodate chamber, 62, lead-in wire chamber, 7, transmission cable, 8, joint.
Detailed description of the invention
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.The present embodiment is implemented premised on technical solution of the present invention, gives detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
In describing the invention, term " laterally ", " longitudinally ", " on ", D score, "front", "rear", "left", "right", " vertically ", " level ", " top ", the orientation of the instruction such as " end " or position relationship be based on orientation shown in the drawings or position relationship, it is for only for ease of description invention rather than requires that therefore the present invention must be not considered as limiting the invention with specific azimuth configuration and operation.
In describing the invention, unless otherwise prescribed and limit, it should be noted that, term " is installed ", " being connected ", " connection " should be interpreted broadly, can be to be mechanically connected or be electrically connected, can also be the connection of two element internals, can be to be joined directly together, it is also possible to be to be indirectly connected to by intermediary.
Embodiment 1
As shown in Figure 1, the present embodiment provides a kind of sensitivity reinforced electric eddy current sensor, including the coil block being sequentially connected with, circuit board 5, transmission cable 7 and joint 8, coil block includes guard shield 1 and the magnetic core 4 being arranged in guard shield 1 and coil 3, magnetic core 4 is rotary body magnetic core that shaft section is T-shaped, coil 3 is open column shape coil, magnetic core 4 small end inserts in the cavity of coil 3, magnetic core 4 small end is down, big end is upward, magnetic core 4 is held greatly and is abutted against with coil 3 upper surface, and coil 3 is connected with circuit board 5, is additionally provided with sheath 2 outside guard shield 1.
In the present embodiment, as shown in Figures 2 and 3, employing shaft section is the magnetic core 4 of T-shaped to the structure of magnetic core 4, and the material that magnetic core 4 uses resistivity higher is made, such as ferrite.In order to ensure that the upper end (one end that diameter is big) of magnetic core 4 has stronger reflecting effect to alternating electromagnetic field, upper end diameter is 2～4:1 with the ratio of lower end (one end that diameter is little).Meanwhile, in order to ensure that current vortex sensor has preferable lift-off performance, the small end height of T-shaped magnetic core is 2～5:1 with the ratio of big end height.Such as, magnetic core upper end diameter is 10mm, and lower end diameter is 3～4mm.The upper end level of magnetic core is 3mm, and lower end height is 8mm.
In the present embodiment, the structure of coil 3 as shown in Figure 4 and Figure 5, uses hollow cylindrical coil.Coil 3 and magnetic core 4 with the use of, it is internal that magnetic core 4 small end inserts air core coil 3, and down, big end is upward for magnetic core 4 small end.The big end external diameter of magnetic core 4, more than or equal to the external diameter of coil 3, so can ensure that magnetic core produces stronger reflection effect.Such as, the external diameter of coil is 10mm, and internal diameter is 3～4mm, a height of 8mm.
In the present embodiment, circuit board 5 is welded with 2 paster fixed capacities, 1 variable patch capacitor and 1 Chip-R.Coil 3 is connected to circuit board 5, and circuit board 5 is connected with joint 8 by transmission cable 7, and Fig. 6 show their annexation figure.Described electric capacity, resistance and coil 3 constitute RLC resonance structure.Transmission cable 7 is three-core shielding cable, and the first lead-in wire of transmission cable 7, the second lead-in wire add sinusoidal excitation signal, and the 3rd lead-in wire is the output signal of sensor.
In the present embodiment, guard shield 1 and sheath 2 are made by nonmetallic materials.In the present embodiment, the material of guard shield 1 is ceramic material, and its shape is barrel-shaped.The external diameter 11mm of such as guard shield 1, wall thickness is 0.5mm, a height of 10～12mm.Sheath 2 is made up of polytetrafluoroethylplastic plastic.
During the work of above-mentioned current vortex sensor, the external drive circuit being connected with joint 8 produce sinusoidal signal and be passed through circuit board 5 by first, second lead-in wire within transmission cable 7.Circuit board 5 is drawn by the 3rd lead-in wire within transmission cable 7 at Inner Constitution RLC oscillating circuit, the voltage signal on coil 3 with coil 3.Due to the T-shaped magnetic core using higher resistivity materials to constitute, it is effectively improved detection sensitivity and the sensing distance of current vortex sensor, improve measured range ability and certainty of measurement, can be widely applied to electrical conductivity test, nondestructive inspection and the measurement of multiple mechanical-physical amount.
Embodiment 2
With reference to shown in Fig. 1, the sensitivity reinforced electric eddy current sensor that the present embodiment provides also includes shell 6, this shell 6 includes receiving chamber 61 and the lead-in wire chamber 62 being connected, coil block and circuit board 5 are arranged in receiving chamber 61, transmission cable 7 one end is connected with circuit board 5, and the other end is connected through lead-in wire chamber 62 with joint 8.Shell 6 is made up of nonmetallic materials, such as polytetrafluoroethylplastic plastic etc..Remaining is with embodiment 1.
Although present disclosure has been made to be discussed in detail by above preferred embodiment, but it should be appreciated that the description above should not be considered as limitative to the invention.After those skilled in the art have read foregoing, multiple amendment and replacement for the present invention will be apparent from.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (10)
1. a sensitivity reinforced electric eddy current sensor, including the coil block being sequentially connected with, circuit board (5), transmission cable (7) and joint (8), it is characterised in that:
Described coil block includes guard shield (1) and the magnetic core (4) being arranged in guard shield (1) and coil (3), described magnetic core (4) be shaft section be the rotary body magnetic core of T-shaped, described coil (3) is open column shape coil, described magnetic core (4) small end inserts in the cavity of coil (3), magnetic core (4) end greatly abuts against with coil (3) end face, and described coil (3) is connected with circuit board (5).
Sensitivity reinforced electric eddy current sensor the most according to claim 1, it is characterised in that: the ratio of described magnetic core (4) outside diameter and end diameter is 2～4:1.
Sensitivity reinforced electric eddy current sensor the most according to claim 1, it is characterised in that: described magnetic core (4) small end height is 2～5:1 with the ratio of big end height.
Sensitivity reinforced electric eddy current sensor the most according to claim 1, it is characterised in that: described magnetic core (4) outside diameter is more than or equal to the external diameter of coil (3).
Sensitivity reinforced electric eddy current sensor the most according to claim 1, it is characterised in that: the material of described magnetic core (4) includes ferrite.
Sensitivity reinforced electric eddy current sensor the most according to claim 1, it is characterized in that: also include shell (6), this shell (6) includes receiving chamber (61) and lead-in wire chamber (62) being connected, described coil block and circuit board (5) are arranged in receiving chamber (61), described transmission cable (7) one end is connected with circuit board (5), and the other end is connected through lead-in wire chamber (62) with joint (8).
Sensitivity reinforced electric eddy current sensor the most according to claim 6, it is characterised in that: described guard shield (1) and shell (6) are made by nonmetallic materials.
Sensitivity reinforced electric eddy current sensor the most according to claim 1, it is characterised in that: it is additionally provided with sheath (2) outside described guard shield (1).
Sensitivity reinforced electric eddy current sensor the most according to claim 8, it is characterised in that: described sheath (2) is made up of nonmetallic materials.
Sensitivity reinforced electric eddy current sensor the most according to claim 1, it is characterised in that: described transmission cable (7) is three-core shielding cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610140189.3A CN105823493A (en) | 2016-03-11 | 2016-03-11 | Sensitivity enhancement type eddy current transducer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610140189.3A CN105823493A (en) | 2016-03-11 | 2016-03-11 | Sensitivity enhancement type eddy current transducer |
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| CN105823493A true CN105823493A (en) | 2016-08-03 |
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| CN201610140189.3A Pending CN105823493A (en) | 2016-03-11 | 2016-03-11 | Sensitivity enhancement type eddy current transducer |
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Cited By (7)
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|---|---|---|---|---|
| CN107121153A (en) * | 2017-05-22 | 2017-09-01 | 天津大学 | High speed current vortex sensor |
| CN107830797A (en) * | 2017-11-18 | 2018-03-23 | 中机生产力促进中心 | Wide range current vortex sensor for Deformation inspection and preparation method thereof |
| CN108459077A (en) * | 2017-12-14 | 2018-08-28 | 科瑞工业自动化系统（苏州）有限公司 | A kind of current vortex sensor using Ⅴ-permandur alloy |
| CN108760875A (en) * | 2018-05-18 | 2018-11-06 | 广东省特种设备检测研究院珠海检测院 | A kind of portable tape clad stress metal pipeline-weld positioning device and localization method |
| CN109990806A (en) * | 2019-04-02 | 2019-07-09 | 上海瑞视仪表电子有限公司 | A kind of manufacturing process of current vortex sensor |
| CN111399067A (en) * | 2019-01-03 | 2020-07-10 | 比亚迪股份有限公司 | Conductive foreign object detection system and method for vehicle wireless charging device |
| CN113340985A (en) * | 2021-05-17 | 2021-09-03 | 中车青岛四方机车车辆股份有限公司 | Eddy current detection probe |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107121153A (en) * | 2017-05-22 | 2017-09-01 | 天津大学 | High speed current vortex sensor |
| CN107830797A (en) * | 2017-11-18 | 2018-03-23 | 中机生产力促进中心 | Wide range current vortex sensor for Deformation inspection and preparation method thereof |
| CN107830797B (en) * | 2017-11-18 | 2023-10-27 | 中机生产力促进中心 | Large-range eddy current sensor for pipeline deformation detection and manufacturing method thereof |
| CN108459077A (en) * | 2017-12-14 | 2018-08-28 | 科瑞工业自动化系统（苏州）有限公司 | A kind of current vortex sensor using Ⅴ-permandur alloy |
| CN108760875A (en) * | 2018-05-18 | 2018-11-06 | 广东省特种设备检测研究院珠海检测院 | A kind of portable tape clad stress metal pipeline-weld positioning device and localization method |
| CN111399067A (en) * | 2019-01-03 | 2020-07-10 | 比亚迪股份有限公司 | Conductive foreign object detection system and method for vehicle wireless charging device |
| CN109990806A (en) * | 2019-04-02 | 2019-07-09 | 上海瑞视仪表电子有限公司 | A kind of manufacturing process of current vortex sensor |
| CN113340985A (en) * | 2021-05-17 | 2021-09-03 | 中车青岛四方机车车辆股份有限公司 | Eddy current detection probe |
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Application publication date: 20160803 |
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