CN217983046U - A Magnetic Core Coil Sensor for Earth-Space Frequency Domain Electromagnetic Detection - Google Patents

Abstract

The utility model relates to the technical field of electromagnetic detection and reception in the ground-space frequency domain, in particular to a magnetic core coil sensor for ground-space frequency domain electromagnetic detection. The magnetic core coil sensor includes a coil frame and a magnetic core, and the coil frame includes a plurality of The partitions are arranged in parallel, and cylindrical sections of equal length are formed between the partitions. The copper wires are wound on the cylindrical sections, and the copper wires in adjacent cylindrical sections are connected in series. The coil skeleton is a hollow structure. In the hollow A magnetic core is arranged in the structure, and the magnetic core is wrapped in a hollow structure after laminating a plurality of parallel columnar small magnetic cores. The magnetic core coil sensor of the utility model solves the problem of insufficient low-frequency signal response in the existing system, increases the exploration depth, and improves the exploration efficiency. The coil is divided into multiple parts through the skeleton partition, which reduces the self-capacitance and improves the coil bandwidth.

Description

A Magnetic Core Coil Sensor for Earth-Space Frequency Domain Electromagnetic Detection

technical field

The utility model relates to the technical field of electromagnetic detection and reception in the ground-space frequency domain, in particular to a magnetic core coil sensor for ground-space frequency domain electromagnetic detection.

Background technique

The ground-air frequency domain electromagnetic detection uses the UAV as a flying platform, equipped with a receiving coil sensor and receiver, and moves in the air according to the survey line trajectory to receive the magnetic field signal. The magnetic field signal contains geological information of the measured area, and the receiving coil induces changes. The magnetic field is an electrical signal, and the receiver adjusts and collects the electrical signal, and obtains underground information through post-processing. The receiving coils of the existing semi-airborne electromagnetic detection usually use an air-core coil structure, but its disadvantages include low sensitivity and insufficient low-frequency response, which limit the large-depth detection of ground-air electromagnetic detection.

In the frequency domain electromagnetic detection method, signals of different frequencies reflect geological information at different depths. To measure geological information from the shallow surface to large depths, the receiving coil must have sufficient sensitivity and bandwidth. Due to the limited load capacity of the drone, this There are requirements for the size and weight of the coil bobbin, and there are also requirements for the number of coil turns that the coil bobbin can wind.

Utility model content

The technical problem to be solved by the utility model is to provide a core coil sensor for electromagnetic detection in the ground-air frequency domain, which solves the problem of insufficient low-frequency signal response in the existing system, and makes the electromagnetic detection effect in the ground-space frequency domain more accurate and stable.

The utility model is achieved in this way, a magnetic core coil sensor for ground-space frequency domain electromagnetic detection, the magnetic core coil sensor includes a coil frame and a magnetic core, the coil frame includes a plurality of equally spaced and parallel partitions, the partitions Cylindrical segments of equal length are formed between the plates, copper wires are wound around the cylindrical segments, the copper wires in adjacent cylindrical segments are connected in series, the coil skeleton is a hollow structure, and a magnetic core is arranged in the hollow structure, and the The magnetic core is a plurality of parallel cylindrical small magnetic cores bonded and wrapped in a hollow structure.

Further, the columnar section is 11 sections separated by 12 partitions.

Further, there is a notch on the partition for winding the copper wire on the adjacent cylindrical section, and a hole for connecting the copper wire to the interface of the receiver after passing through.

Further, the notch is a fan-shaped notch. ,

Further, the notch and the slot are designed with rounded corners.

Further, on the partitions at both ends, a square bayonet is provided on the side of the end opposite to the notch.

Further, there are five cylindrical small magnetic cores, and the sum of the diameters of the three small magnetic cores is smaller than the inner diameter of the hollow structure.

Furthermore, the copper wire is wound unevenly on the coil frame, the cylindrical section at the center has more turns, and the cylindrical sections at both ends have fewer turns.

Compared with the prior art, the utility model has the beneficial effects that:

The magnetic core coil sensor of the utility model solves the problem of insufficient low-frequency signal response in the existing system, increases the exploration depth, and improves the exploration efficiency. The coil is divided into 11 parts through the skeleton partition to reduce self-capacitance and improve the coil bandwidth. The coil is non-uniformly wound on the bobbin, the central part of the magnetic core is wound with more turns, and the turns wound at both ends are less, which can ensure the utilization of the effective magnetic permeability of the magnetic bar. The magnetic permeability distributed on the surface of multiple small-diameter cylindrical magnetic cores is greater than the magnetic permeability of a single large-diameter cylindrical magnetic core, which can improve the sensitivity of the coil sensor.

Description of drawings

Fig. 1 is the structural representation of the sensor that the utility model embodiment provides;

FIG. 2 is a structural schematic diagram of a cross-section of a magnetic core provided by an embodiment of the present invention.

detailed description

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

Referring to Fig. 1 and Fig. 2, a ground-space frequency-domain electromagnetic detection magnetic core coil sensor includes a coil formed by winding copper wires, a coil bobbin, and a magnetic core arranged inside the coil bobbin. Thickness, and the dividing plate 1 that equal diameter is arranged is isolated into a plurality of cylindrical sections 5, and each cylindrical section is equal in diameter and height, and in the present embodiment, is separated into 11 cylindrical sections by 12 dividing plates, and copper wire Wound on the cylindrical section to reduce self-capacitance and increase coil bandwidth.

By controlling the number of turns of the coil part in each section of the skeleton, and by adding a partition structure, the segmented design is realized. The coil is non-uniformly wound on the bobbin, the central part of the magnetic core is wound with more turns, and the turns wound at both ends are less, which can ensure the utilization of the effective magnetic permeability of the magnetic bar.

A scalloped notch 2 is designed on the partition to facilitate coil winding. And a slot 3 is provided on the other side of the corresponding fan-shaped notch, which can also be used for copper wires to pass through, so as to facilitate the connection between the coil and the interface of the receiver. All fan-shaped notches correspond to each other, and the upper and lower positions of the hole slots correspond to each other. The fan-shaped notches and hole slots are rounded to avoid the wear of the copper wire.

On the partitions at both ends, the parts corresponding to the fan-shaped gaps are respectively provided with a small cube bayonet 3, so that the magnetic core sensor remains stable in the shell and avoids the interference of the drone shaking.

As shown in FIG. 2 , the magnetic core is composed of five small cylindrical magnetic cores 6 , and the sum of the diameters of the three small magnetic cores is smaller than the inner diameter of a single coil bobbin. 5 magnetic cores are bonded together and wrapped in the bobbin. The magnetic permeability distributed on the surface of multiple small-diameter cylindrical magnetic cores is greater than the magnetic permeability of a single large-diameter cylindrical magnetic core, which can improve the sensitivity of the coil sensor.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models.

Claims (8)

1. The utility model provides a ground space frequency domain electromagnetic detection magnetic core coil sensor, its characterized in that, this magnetic core coil sensor contain coil skeleton and magnetic core, coil skeleton includes a plurality of equidistant and parallel arrangement's baffle, forms the cylindricality section of length such as between the baffle, and copper line winding is in the cylindricality section, and the copper line in the adjacent cylindricality section is established ties mutually, is hollow structure in the coil skeleton set up the magnetic core in the hollow structure, the magnetic core wraps up in hollow structure after being the little magnetic core laminating of column of a plurality of parallels.

2. The ground-to-air frequency domain electromagnetic survey core coil sensor of claim 1 wherein the cylindrical section is 11 sections separated by 12 baffles.

3. A magnetic core coil sensor for electromagnetic survey in the earth-space frequency domain as recited in claim 1, wherein said spacer has a cutout for winding of copper wire on adjacent cylindrical sections and a slotted hole for connecting the copper wire to the receiver interface after passing through.

4. A space-frequency-domain electromagnetic sounding core coil sensor according to claim 3, wherein said notch is a fan-shaped notch.

5. A space-frequency-domain electromagnetic sounding core coil sensor according to claim 3, wherein said notches and slots are rounded.

6. A space-frequency-domain electromagnetic survey magnetic core coil sensor according to claim 3 wherein the spacer plates at both ends have a square bayonet on the side opposite the notch.

7. A ground-air frequency domain electromagnetic survey core coil sensor as defined in claim 1 wherein said column-shaped small cores are 5, the sum of the diameters of the three small cores being less than the inner diameter of the hollow structure.

8. The ground-to-air frequency domain electromagnetic survey magnetic core coil sensor of claim 1 wherein the copper wire is wound unevenly on the bobbin, the cylindrical section of the central portion being wound a greater number of turns and the cylindrical sections of the two ends being wound a lesser number of turns.

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