CN105023706A - Planar coil applicable to eddy-current nondestructive testing - Google Patents

Planar coil applicable to eddy-current nondestructive testing Download PDF

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Publication number
CN105023706A
CN105023706A CN201510409630.9A CN201510409630A CN105023706A CN 105023706 A CN105023706 A CN 105023706A CN 201510409630 A CN201510409630 A CN 201510409630A CN 105023706 A CN105023706 A CN 105023706A
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CN
China
Prior art keywords
printed board
plane thread
thread pipe
via hole
coil
Prior art date
Application number
CN201510409630.9A
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Chinese (zh)
Inventor
郑阔海
杨生胜
苗育君
王鷁
李存惠
文轩
顾征
邹昕
陈丽平
Original Assignee
兰州空间技术物理研究所
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Application filed by 兰州空间技术物理研究所 filed Critical 兰州空间技术物理研究所
Priority to CN201510409630.9A priority Critical patent/CN105023706A/en
Publication of CN105023706A publication Critical patent/CN105023706A/en

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Abstract

The invention discloses a planar coil applicable to eddy-current nondestructive testing. In the planar coil, two rectangular planar solenoids A and B are machined on the front surface of a printed board, and the two planar solenoids are same in the number of turns, opposite in direction and symmetric in positions and shapes; winding finish sides of the two planar solenoids are arranged between the two planar solenoids, the finish side of the planar solenoid A is directly led from the front surface of the printed board to a second wiring terminal arranged at the edge of the printed board through a vertical line, and the finish side of the planar solenoid B is connected with one end of a coil connection line on the back surface of the printed board through a second via hole; a central tap of the planar solenoid A is connected with the other end of the coil connection line on the back surface of the printed board through a third via hole; and a central tap of the planar solenoid B is connected with one end of a leading-out line arranged on the back surface of the printed board through a first via hole, and the other end of the leading-out line is connected with a first wiring terminal. By the planar coil, a wide range of uniform-magnetism region can be acquired.

Description

A kind of planar coil that can be used for current vortex Non-Destructive Testing

Technical field

The invention belongs to electromagnetic nondestructive field, be specifically related to a kind of planar coil that can be used for current vortex Non-Destructive Testing.

Background technology

Image checking is the developing direction of electromagnetic nondestructive, is also the focus of current technology innovation, plays footy effect to the progress of basic industries.Traditional electrical Eddy Current Nondestructive Testing coil does skeleton with soft magnetic material, form with enamelled wire coiling, magnetic homogeneous area is limited, or the skeleton of large-size is used in order to obtain large area magnetic homogeneous area, this considerably increases the size of detection probe, there is strict requirement to the size of detection probe in practical application, make this technology application difficult.At present, the research of China in electromagnetic nondestructive imaging is treated to master mainly with Back end data, and the Front-end Design not yet for detection probe carries out the research after use.

Summary of the invention

In view of this, the invention provides a kind of planar coil that can be used for current vortex Non-Destructive Testing, magnetic homogeneous area in a big way can be obtained, realize the array layout of Magnetic Sensor, contribute to the magnetic imaging realizing current vortex Non-Destructive Testing.Be applicable to surface, sub-surface damage detects.

In order to solve the problems of the technologies described above, the present invention is achieved in that

Can be used for a planar coil for current vortex Non-Destructive Testing, it utilizes silk screening techniques, is directly processed in printed board by planar coil;

The front of printed board is processed with plane thread pipe A and the plane solenoid B of two rectangles, and the back side is processed with the lead-out wire of connecting line and plane solenoid B between coil; Printed board is also processed with three via holes and two binding posts with the form of via hole;

Two plane thread pipe coiling number of turns are identical, direction contrary, position and symmetrical shape; The end limit of the coiling from inside to outside of two plane thread pipes is between two plane thread pipes; The end limit of plane thread pipe A directly leads to by vertical curve the second binding post being positioned at printed board edge in the front of printed board, the end limit of plane thread pipe B connected by the second via hole be positioned at the printed board back side coil between wherein one end of connecting line;

The centre cap of plane thread pipe A connects the other end of connecting line between described coil by the 3rd via hole; The centre cap of plane thread pipe B connects the one end being positioned at the described lead-out wire at the printed board back side by the first via hole, the other end of lead-out wire connects the first binding post;

The size of two plane thread pipe rectangles is determined according to required magnetic homogeneity range.

Preferably, at the printed board back side: between coil connecting line from the 3rd via hole by extending outside horizontal alignment printed board, after exceeding the territory, lateral footprint of plane thread pipe A, extend straight up, after exceeding longitudinal overlay area of plane thread pipe A, level extends to printed board center, until be connected to the second via hole;

Lead-out wire from the first via hole by extending outside horizontal alignment, after exceeding the territory, lateral footprint of plane thread pipe B, extend straight up, after exceeding longitudinal overlay area of plane thread pipe B, level extends to printed board center, until after flushing with the first binding post vertical direction, vertically to printed board extension, until be connected to the first binding post.

Preferably, in the front of printed board, all horizontal space D 2 are identical, and except two plane thread tube pitch, the space D 1 of other all vertical curves is identical.

Preferably, between coil, connecting line starts to be divided into the first horizontal segment, vertically end and the second horizontal segment successively from the 3rd via hole, and wherein, vertically end equals D1 to the spacing of plane thread pipe A left part outermost vertical curve; Second horizontal segment equals D2 to the horizontal spacing of plane thread pipe A top outermost.

Preferably, described lead-out wire starts to be divided into successively that the first horizontal segment, first is vertically held, the second horizontal segment and second is vertically held from the first via hole; Wherein, the first vertical section equals D1 to the spacing of plane thread pipe B right part outermost vertical curve; Second horizontal segment equals D2 to the horizontal spacing of plane thread pipe B top outermost.

Beneficial effect:

(1) planar coil constructed by the present invention, it can be processed as strip, and the non-uniform area at two ends is little, can not use, and middle part magnetic homogeneity range is longer, has the enough transducer of space layout for measuring.

(2) coil is directly produced in printed board, by the shape of regulating winding and the size of length of side adjustment magnetic homogeneity range, precision is high, and array layout is convenient, contribute to the spatial resolution improving Eddy Current Nondestructive Testing, promote current vortex Non-Destructive Testing imaging technique to useization future development.

(3) planar coil constructed by the present invention can realize the array layout of Magnetic Sensor, contributes to the magnetic imaging realizing current vortex Non-Destructive Testing.

(4) no matter front, reverse side, as far as possible equidistantly, horizontal line as far as possible equidistantly, thus ensures magnetic field homogeneity to vertical curve.

Accompanying drawing explanation

Fig. 1 is the schematic diagram of the present invention's two planar coils;

Fig. 2 is the structural representation that the present invention can be used for the planar coil of current vortex Non-Destructive Testing, and solid line is printed board front cabling, and dotted line is printed board back side cabling;

Wherein, 1-printed board, 2-first via hole, 3-plane thread pipe B, 4-lead-out wire, 5-first binding post, 6-second via hole, 7-second binding post, connecting line between 8-coil, 9-plane thread pipe A, 10-the 3rd via hole.

Embodiment

To develop simultaneously embodiment below in conjunction with accompanying drawing, describe the present invention.

The present invention utilizes silk screening techniques, is directly processed by coil in printed board 1, forms two plane thread pipes (9 in Fig. 1 and 3).Wherein, printed board front printed coil, connecting line is printed at the back side.Specifically carry out structure see Fig. 2, in order to the annexation of clear display two plane thread pipes in Fig. 2, do not draw according to the actual ratio that plane thread pipe range is wide, in reality general using plane thread control as strip, and between two plane thread pipes, there is certain spacing, this spacing is exactly provided uniform magnetic area, and Magnetic Sensor can be installed by this spacing place, to carry out magnetic-field measurement.Printed board closely carries out scanning to detected object, when magnetic field changes, can know that damage appears in detected object.

As shown in Figure 2, the front of printed board is processed with plane thread pipe A9 and the plane solenoid B 3 of two rectangles, and the back side is processed with the lead-out wire 4 of connecting line 8 and plane solenoid B between coil.Printed board is also processed with three via holes, 2,6,10 and two binding posts 5,7 with the form of via hole.

Two plane thread pipe coiling number of turns are identical, direction contrary, position and symmetrical shape, thus the N pole of form symmetry and S pole.Be positioned at the plane thread pipe A coiling counterclockwise from inside to outside in left side, be positioned at the plane thread pipe B coiling clockwise from inside to outside on right side, coiling all smooth vertical and horizontal during coiling.The coiling of two plane thread pipes terminates limit between two plane thread pipes, the end limit of plane thread pipe A directly leads to by vertical curve the second binding post 7 being positioned at printed board edge in the front of printed board, the end limit of plane thread pipe B connected by the second via hole 6 be positioned at the printed board back side coil between wherein one end of connecting line 8.

The centre cap of plane thread pipe A connected by the 3rd via hole 10 be positioned at the printed board back side coil between the other end of connecting line 8, thus two solenoids to be coupled together.

Between coil connecting line 8 from the 3rd via hole 10s by extending outside horizontal alignment printed board, thus the magnetic field between avoiding coil impacts, after exceeding the territory, lateral footprint of plane thread pipe A, between coil, connecting line 8 continues to extend straight up, after exceeding longitudinal overlay area of plane thread pipe A, level extends to printed board center, until be connected to the second via hole 6.

The centre cap of plane thread pipe B connects the one end being positioned at the described lead-out wire 4 at the printed board back side by the first via hole 2.Lead-out wire 4 from the first via hole 2s by extending outside horizontal alignment, thus the magnetic field between avoiding coil impacts, after exceeding the territory, lateral footprint of plane thread pipe B, lead-out wire 4 continues to extend straight up, after exceeding longitudinal overlay area of plane thread pipe B, level extends to printed board center, until after flushing with the first binding post 6 vertical direction, vertically to printed board extension, until be connected to the first binding post 6.

The size of two plane thread pipe rectangles is determined according to required magnetic homogeneity range; In the front of printed board, all horizontal space D 2 are identical, and except two plane thread tube pitch, the space D 1 of other all vertical curves is identical, thus ensure magnetic field's regularity.

For ensureing magnetic field's regularity further, between coil, connecting line 8 is divided into the first horizontal segment, vertically end and the second horizontal segment three sections from the 3rd via hole 10 to the second via hole 6, and wherein, vertically end equals D1 to the spacing of plane thread pipe A left part outermost vertical curve; Second horizontal segment equals D2 to the horizontal spacing of plane thread pipe A top outermost.

In like manner, lead-out wire 4 starts also can be divided into that the first horizontal segment, first is vertically held, the second horizontal segment and second vertically four sections, end from the first via hole 2; Wherein, the first vertical section equals D1 to the spacing of plane thread pipe B right part outermost vertical curve; Second horizontal segment equals D2 to the horizontal spacing of plane thread pipe B top outermost.

In sum, these are only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (5)

1. can be used for a planar coil for current vortex Non-Destructive Testing, it is characterized in that, utilize silk screening techniques, planar coil is directly processed in printed board (1);
The front of printed board is processed with plane thread pipe A (9) and the plane solenoid B (3) of two rectangles, and the back side is processed with the lead-out wire (4) of connecting line between coil (8) and plane solenoid B; Printed board is also processed with three via holes (2,6,10) and two binding posts (5,7) with the form of via hole;
Two plane thread pipe coiling number of turns are identical, direction contrary, position and symmetrical shape; The end limit of the coiling from inside to outside of two plane thread pipes is between two plane thread pipes; The end limit of plane thread pipe A directly leads to by vertical curve the second binding post (7) being positioned at printed board edge in the front of printed board, the end limit of plane thread pipe B connected by the second via hole (6) be positioned at the printed board back side coil between wherein one end of connecting line (8);
The centre cap of plane thread pipe A connects the other end of connecting line (8) between described coil by the 3rd via hole (10); The centre cap of plane thread pipe B connects the one end being positioned at the described lead-out wire (4) at the printed board back side by the first via hole (2), the other end of lead-out wire (4) connects the first binding post (5);
The size of two plane thread pipe rectangles is determined according to required magnetic homogeneity range.
2. can be used for the planar coil of current vortex Non-Destructive Testing as claimed in claim 1, it is characterized in that, at the printed board back side:
Between coil, (10)s are by extending outside horizontal alignment printed board from the 3rd via hole for connecting line (8), after exceeding the territory, lateral footprint of plane thread pipe A, extend straight up, after exceeding longitudinal overlay area of plane thread pipe A, level extends to printed board center, until be connected to the second via hole (6);
(2)s are by extending outside horizontal alignment from the first via hole for lead-out wire (4), after exceeding the territory, lateral footprint of plane thread pipe B, extend straight up, after exceeding longitudinal overlay area of plane thread pipe B, level extends to printed board center, until after flushing with the first binding post (6) vertical direction, vertically to printed board extension, until be connected to the first binding post (6).
3. can be used for the planar coil of current vortex Non-Destructive Testing as claimed in claim 1 or 2, it is characterized in that, in the front of printed board, all horizontal space D 2 are identical, and except two plane thread tube pitch, the space D 1 of other all vertical curves is identical.
4. can be used for the planar coil of current vortex Non-Destructive Testing as claimed in claim 3, it is characterized in that, between coil, connecting line (8) starts to be divided into the first horizontal segment, vertically end and the second horizontal segment successively from the 3rd via hole (10), wherein, the spacing to plane thread pipe A left part outermost vertical curve is vertically held to equal D1; Second horizontal segment equals D2 to the horizontal spacing of plane thread pipe A top outermost.
5. can be used for the planar coil of current vortex Non-Destructive Testing as claimed in claim 3, it is characterized in that, described lead-out wire (4) starts to be divided into that the first horizontal segment, first is vertically held, the second horizontal segment and second is vertically held successively from the first via hole (2); Wherein, the first vertical section equals D1 to the spacing of plane thread pipe B right part outermost vertical curve; Second horizontal segment equals D2 to the horizontal spacing of plane thread pipe B top outermost.
CN201510409630.9A 2015-07-13 2015-07-13 Planar coil applicable to eddy-current nondestructive testing CN105023706A (en)

Priority Applications (1)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105301096A (en) * 2015-11-20 2016-02-03 清华大学 Array type flexible eddy current probe for hollow axle inner wall flaw detection
CN109613459A (en) * 2018-12-06 2019-04-12 厦门大学 The micro-fluidic plane gradient coil of superconducting pulse nuclear magnetic resonance chemical analyser and mounting bracket

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4425511A (en) * 1981-02-09 1984-01-10 Amnon Brosh Planar coil apparatus employing a stationary and a movable board
JP2007093350A (en) * 2005-09-28 2007-04-12 Canon Electronics Inc Magnetic detection element
CN102375026A (en) * 2010-07-08 2012-03-14 奥林巴斯Ndt公司 2D coil and a method of obtaining ec response of 3d coils using the 2d coil configuration
CN104407047A (en) * 2014-11-21 2015-03-11 昆明理工大学 Eddy current testing probe based on TMR magnetic field sensor array and detecting method of eddy current testing probe

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4425511A (en) * 1981-02-09 1984-01-10 Amnon Brosh Planar coil apparatus employing a stationary and a movable board
JP2007093350A (en) * 2005-09-28 2007-04-12 Canon Electronics Inc Magnetic detection element
CN102375026A (en) * 2010-07-08 2012-03-14 奥林巴斯Ndt公司 2D coil and a method of obtaining ec response of 3d coils using the 2d coil configuration
CN104407047A (en) * 2014-11-21 2015-03-11 昆明理工大学 Eddy current testing probe based on TMR magnetic field sensor array and detecting method of eddy current testing probe

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105301096A (en) * 2015-11-20 2016-02-03 清华大学 Array type flexible eddy current probe for hollow axle inner wall flaw detection
CN105301096B (en) * 2015-11-20 2019-04-23 清华大学 Array-type flexible eddy current probe for the flaw detection of hole-bored axle from end to end inner wall
CN109613459A (en) * 2018-12-06 2019-04-12 厦门大学 The micro-fluidic plane gradient coil of superconducting pulse nuclear magnetic resonance chemical analyser and mounting bracket

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Application publication date: 20151104