CN105242224A - A hug closely formula bilayer plane radio frequency coil for composite insulator detects - Google Patents

Abstract

The invention discloses a close-fit double-layer planar radio frequency coil for composite insulator detection, which includes a front sub-coil and a back sub-coil, the inner ends of the front sub-coil and the back sub-coil are used to connect a matching circuit, and the front sub-coil is It is wound in a counterclockwise direction from inside to outside in one plane, and the back sub-coil is wound in a counterclockwise direction from outside to inside in another plane. The front sub-coil and the back sub-coil are parallel and relatively used. The two are arranged symmetrically as mirror images, and a gap is formed between the two. The outer end of the front sub-coil and the outer end of the back sub-coil are connected through a lead wire, and the umbrella skirt of the composite insulator is engaged through the gap and the front sub-coil and the back sub-coil are connected together. The opposite sub-coil is close to it to fasten the radio frequency coil on the composite insulator. The radio-frequency magnetic field generated by the invention has good uniformity and can enhance the intensity of the radio-frequency magnetic field. The invention can be clamped and fixed with the edge of the composite insulator, so that the coil and the composite insulator form a tightly combined and relatively stable structure.

Description

A close-fit double-layer planar radio frequency coil for composite insulator detection

technical field

The invention relates to a radio frequency coil, in particular to a close-fit double-layer planar radio frequency coil for composite insulator detection.

Background technique

Nuclear magnetic resonance is a physical phenomenon in which the nuclear magnetic moment of a substance undergoes energy level splitting under the action of an external magnetic field, and an energy level transition occurs under the action of an external radio frequency magnetic field. Since the discovery of nuclear magnetic resonance absorption by American scientists Bloch and Purcell in 1946, nuclear magnetic resonance technology has achieved unprecedented development in the fields of spectroscopy and medical imaging, which has greatly promoted the progress of human society.

NMR equipment using NMR technology includes high-field NMR equipment and low-field NMR equipment. Common high-field nuclear magnetic resonance equipment, such as nuclear magnetic resonance spectrometers and medical magnetic resonance imagers, have disadvantages such as bulky, heavy, and poor mobility, making them suitable for on-site detection of actual samples (real-time monitoring of patient conditions) In addition, the samples of high-field NMR equipment must be placed in a closed magnet cavity with a certain size before they can be measured, which makes high-field NMR unable to perform non-destructive testing on large samples with arbitrary shapes. The low-field NMR equipment makes up for the shortcomings of the high-field NMR equipment with its characteristics of being open, portable, and capable of measuring samples with arbitrary shapes, and has gradually become a frontier topic in NMR technology research.

Whether it is a high-field nuclear magnetic resonance device or a low-field nuclear magnetic resonance device, in nuclear magnetic resonance, the radio frequency magnetic field is generated by the radio frequency coil. The radio frequency coil has the functions of exciting and receiving nuclear magnetic resonance signals, that is, triggering the H nucleus of a specific frequency in the sample to undergo magnetic resonance under the action of radio frequency pulses, and receiving the induced nuclear magnetic resonance signals after the trigger pulse is turned off. According to the principle of nuclear magnetic resonance, the radio frequency magnetic field B1 generated by the radio frequency coil must meet the following requirements: (1) The radio frequency magnetic field B1 generated in the target area needs to be orthogonal to the static magnetic field B0 generated by the magnet structure; (2) The radio frequency magnetic field should be as uniform as possible to excite more The sample resonates; (3) The magnetic field strength of the radio frequency magnetic field should be as large as possible to make the received nuclear magnetic resonance signal as large as possible.

For the magnet structure whose static magnetic field B0 is perpendicular to the surface of the magnet, the RF coil usually adopts an "8"-shaped planar RF coil, so that the RF magnetic field B1 generated by it is orthogonal to the static magnetic field B0 generated by the magnet structure in the target area. However, since the "8"-shaped planar RF coil adopts an "8"-shaped structure, there are defects that the RF magnetic field B1 generated in the target area has poor magnetic field uniformity and low magnetic field intensity.

Contents of the invention

The purpose of the present invention is to provide a close-fit double-layer planar radio frequency coil for composite insulator detection with simple structure, low cost, good magnetic field uniformity, and large magnetic field strength. The radio frequency magnetic field B1 generated by the present invention in the target area is perpendicular to The surface of the coil can be used in conjunction with a magnet structure in which the static magnetic field B0 is parallel to the surface of the magnet.

The above object of the present invention is achieved through the following technical solutions: a close-fit double-layer planar radio frequency coil for composite insulator detection, characterized in that it includes a front sub-coil and a back sub-coil, the front sub-coil and the back sub-coil The inner end of the negative sub-coil is used to connect the matching circuit. The positive sub-coil is wound in a counterclockwise direction from inside to outside in one plane, and the reverse sub-coil is wound from outside to inside in another plane. Winding in the counterclockwise direction, the front sub-coil and the back sub-coil are parallel and opposite to each other so that they are mirror-symmetrically arranged, and a gap is formed between the two, the outer end of the front sub-coil and the outer end of the back sub-coil The ends are connected by lead wires, and the shed of the composite insulator is engaged through the gap and the front sub-coil and the back sub-coil are closely attached to fasten the radio frequency coil on the composite insulator.

The working principle of the present invention is: the winding direction of the front sub-coil and the corresponding lower sub-coil are the same, and the direction of the generated radio frequency magnetic field is consistent, which can enhance the strength of the radio frequency magnetic field. If the positive current flows in from the coil port (inner end) of the front sub-coil, the flow direction of the current in the front sub-coil is counterclockwise; the current enters the back sub-coil through the lead wire between the front and back spiral coils, and the current flow direction in the back sub-coil It is also counterclockwise, and the radio frequency magnetic field generated by the current in the front sub-coil and the back sub-coil windings is vertical to the paper.

The uniformity of the radio frequency magnetic field generated by the present invention is good, the winding direction of the positive sub-coil and the corresponding lower sub-coil are the same, the direction of the generated radio frequency magnetic field is consistent, and the strength of the radio frequency magnetic field can be enhanced. At the same time, the shape of the double-layer coil can be compared with that of a composite insulator The edge is clamped and the coil is fixed on the composite insulator with the help of other fixing methods, so that the coil and the composite insulator form a tightly combined and relatively stable structure.

As a preferred embodiment of the present invention, the lead wires are respectively perpendicular to the front sub-coil and the reverse sub-coil, and the lead wires are close to the edge of the shed of the composite insulator.

As an embodiment of the present invention, the distance between the front sub-coil and the back sub-coil is 0.2-5.0 mm.

As an embodiment of the present invention, the radio frequency coil is integrally wound.

As another embodiment of the present invention, the front sub-coil and the back sub-coil are wound separately, one end of the lead wire is connected to the outer end of the front sub-coil, and the other end of the lead wire is connected to the back sub-coil. The outer ends are connected to form the radio frequency coil.

As an embodiment of the present invention, the front sub-coil and the back sub-coil are respectively bonded to the front and back of the shed of the composite insulator by adhesive tape so that they are closely combined with the composite insulator.

Compared with the prior art, the present invention has the following remarkable technical effects:

(1) The radio frequency magnetic field generated by the present invention has good uniformity, the front sub-coil and the corresponding lower reverse sub-coil have the same coil winding direction, and the generated radio frequency magnetic field has the same direction, which can enhance the radio frequency magnetic field strength.

(2) The shape of the double-layer coil can be clamped with the edge of the composite insulator and the coil can be fixed on the composite insulator with other fixing methods, so that the coil and the composite insulator form a tightly combined and relatively stable structure.

(3) The present invention is simple in structure, low in cost, easy to realize, and suitable for wide popularization and application.

Description of drawings

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Fig. 1 is a top view of the present invention;

Fig. 2 is the three-dimensional structure schematic diagram of the present invention;

Fig. 3 is one of the structural representations of the present invention fixed on the shed of the composite insulator;

Fig. 4 is the second structural schematic diagram of the present invention fixed on the shed of the composite insulator.

detailed description

As shown in Figures 1 to 4, it is a close-fitting double-layer planar radio frequency coil for composite insulator detection according to the present invention. It is made of copper wire with a line width of 0.1mm and a line thickness of 0.1mm. It includes The front sub-coil 1 and the back sub-coil 2 can be extended from the coil ports of the front sub-coil and the back sub-coil to connect with the matching circuit. The specific size can be determined by the actual situation. The front sub-coil 1 is in a plane from inside to outside It is wound in a counterclockwise direction, and the reverse sub-coil 2 is wound in a counterclockwise direction from outside to inside in another plane. The front sub-coil 1 and the back sub-coil 2 are parallel and opposite to each other so that they are mirror images. Set (the size of the front sub-coil 1 and the back sub-coil 2 is the same), and form a gap between the two, the outer end of the front sub-coil 1 and the outer end of the back sub-coil 2 are connected by a lead wire 4, and are engaged through the gap Hold the umbrella skirt of the composite insulator 3 and make the front sub-coil 1 and the back sub-coil 2 close to it to fasten the radio frequency coil on the composite insulator 3. Specifically, the front sub-coil 1 and the back sub-coil 2 are bonded to each other by adhesive tape. The composite insulator 3 can be tightly combined with the composite insulator 3 on the front and back of the shed, and other fixing methods can also be used.

The lead wires 4 are respectively perpendicular to the front sub-coil 1 and the reverse sub-coil 2 , and the lead wires 4 are closely attached to the edge of the shed of the composite insulator 3 . The distance between the front sub-coil 1 and the back sub-coil 2 is 0.2-5.0mm, and the length of the lead wire (that is, the distance between the front sub-coil 1 and the back sub-coil 2) is selected according to the thickness of the shed of the composite insulator 3 . The RF coil can be wound as a whole, or the front sub-coil 1 and the back sub-coil 2 can be wound separately, one end of the lead 4 is connected to the outer end of the front sub-coil 1, and the other end of the lead 4 is connected to the back The outer ends of the sub-coils 2 are connected to form a radio frequency coil.

The working principle of the present invention is: the winding direction of the front sub-coil and the corresponding lower sub-coil are the same, and the direction of the generated radio frequency magnetic field is consistent, which can enhance the strength of the radio frequency magnetic field. If the positive current flows in from the coil port (inner end) of the front sub-coil, the flow direction of the current in the front sub-coil is counterclockwise; the current enters the back sub-coil through the lead wire between the front and back spiral coils, and the current flow direction in the back sub-coil It is also counterclockwise, and the radio frequency magnetic field generated by the current in the front sub-coil and the back sub-coil windings is vertical to the paper.

The shape of the front sub-coil and the back sub-coil of the present invention is not limited, and can be square, circular, etc.; the material of the coil can also be other conductive materials such as aluminum.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (6)

1. the close contact double layer planar radio-frequency coil detected for composite insulator, it is characterized in that: it comprises front subcoil and reverse side subcoil, the inner of described front subcoil and reverse side subcoil is used for matching connection circuit, described front subcoil forms according to counter clockwise direction coiling from the inside to the outside in a plane, described reverse side subcoil forms according to counter clockwise direction coiling from outside to inside in another plane, described front subcoil parallel with reverse side subcoil and relatively make the two for specular setting, and form space between, the outer end of front subcoil is connected by lead-in wire with the outer end of reverse side subcoil, engage the full skirt of composite insulator by this space and make that front subcoil and reverse side subcoil are close to and radio-frequency coil is fastened on composite insulator.

2. the close contact double layer planar radio-frequency coil detected for composite insulator according to claim 1, is characterized in that: described lead-in wire is respectively perpendicular to front subcoil and reverse side subcoil, and described lead-in wire is close to the edge of composite insulator umbrella skirt.

3. the close contact double layer planar radio-frequency coil detected for composite insulator according to claim 2, is characterized in that: the distance between described front subcoil and reverse side subcoil is 0.2 ~ 5.0mm.

4. the close contact double layer planar radio-frequency coil detected for composite insulator according to claim 3, is characterized in that: described radio-frequency coil is integrated coiling and forms.

5. the close contact double layer planar radio-frequency coil detected for composite insulator according to claim 3, it is characterized in that: described front subcoil and reverse side subcoil individually coiling form, one end of described lead-in wire is connected with the outer end of front subcoil, the other end of described lead-in wire is connected with the outer end of reverse side subcoil, forms described radio-frequency coil.

6. according to claim 4 or 5 for composite insulator detect close contact double layer planar radio-frequency coil, it is characterized in that: described front subcoil and reverse side subcoil respectively by adhesive tape be bonded in composite insulator umbrella skirt make it on the front and back combine closely with composite insulator.