KR-20260063543-A - SYSTEM FOR DETECTING METAL AND METHOD FOR OPERATING THE SAME

KR20260063543AKR 20260063543 AKR20260063543 AKR 20260063543AKR-20260063543-A

Abstract

A metal detection system and a method of operating the same are provided. The metal detection system detects metal in a surrounding area by magnetizing the surrounding area and measuring changes in hysteresis. The metal detection system includes: i) a magnetization coil unit that generates a magnetic flux to magnetize the surrounding area within 1 ms to 10 ms; ii) a switching element unit that applies a current pulse having a width of 1 ms to 10 ms to the magnetization coil unit; iii) a magnetic detection unit that calculates and outputs the magnetization direction of the magnetic flux; iv) a magnetic sensor applied to detect changes in hysteresis of the surrounding area in conjunction with the magnetization coil unit and convert them into a digital signal; and v) a determination unit applied to determine whether the surrounding area contains metal through a hysteresis curve generated by the digital signal.

Inventors

이승현
채호병
권순철
황이환

Assignees

국방과학연구소
광운대학교 산학협력단

Dates

Publication Date: 20260507
Application Date: 20241030

Claims (15)

A system for detecting metal in a surrounding area by magnetizing the surrounding area and measuring changes in hysteresis, A magnetization coil portion that generates magnetic flux to magnetize the surrounding area within 1ms to 10ms, A switching element part that applies a current pulse having a width of 1ms to 10ms to the magnetizing coil part, A magnetic detector (magnetometer) that calculates and outputs the direction of magnetization of the above magnetic flux, A magnetic sensor unit (magneto-impedance, MI) applied in conjunction with the magnetizing coil unit to detect changes in hysteresis of the surrounding area and convert them into a digital signal, and A determination unit applied to determine whether the surrounding area contains metal through a hysteresis curve generated by the digital signal. A metal detection system including
In paragraph 1, The apparatus further includes a control unit that controls the magnetizing coil unit, the switching element unit, the magnetic detection unit, the magnetic sensor unit, and the discrimination unit. The above control unit is a metal detection system that controls the magnetization direction to be orthogonal to the geomagnetic direction.
In paragraph 1, A metal detection system in which, when the width of the hysteresis curve is relatively small, the discrimination unit determines that the metal is a non-ferrous metal.
In Paragraph 3, The above metal is a metal detection system having a magnetic resistance (Hc) of 1 A/m to 100 A/m.
In Paragraph 3, A metal detection system in which the above non-ferrous metal is copper, gold, or silver.
In paragraph 2, A metal detection system in which, when the width of the hysteresis curve is relatively large, the discrimination unit determines that the metal is a ferromagnetic material.
In paragraph 6, The metal is a metal detection system having a magnetic resistance (Hc) of 10³ A/m to 10⁶ A/m.
In paragraph 6, A metal detection system in which the metal is iron, nickel, or cobalt.
In paragraph 1, The above magnetic sensor unit is a metal detection system linked to the above magnetizing coil unit in pulse timing.
In paragraph 1, The metal detection system described above is installed on an aircraft or a transport vehicle and applied so that the magnetization direction rotates perpendicular to the geomagnetic direction.
A method of operating a metal detection system comprising an interconnected magnetization coil section, a switching element section, a magnetic detection section, a magnetic sensor section, a discrimination section, and a control section, A first step in which the switching element applies a current pulse of 1 ms to 10 ms to the magnetizing coil, A second step in which the magnetizing coil unit generates magnetic flux to magnetize the surrounding area of the metal detection system within 1 ms to 10 ms, A third step in which the magnetic detection unit calculates and outputs the magnetization direction of the magnetic flux, A fourth step in which the magnetic sensor unit is linked with the magnetizing coil unit to detect changes in hysteresis in the surrounding area and convert them into a digital signal, and A fifth step in which the above-mentioned discrimination unit detects metal in the surrounding area through a hysteresis curve generated by the digital signal. A method of operation of a metal detection system including
In Paragraph 11, A method of operating a metal detection system comprising, further, a step between the third step and the fourth step in which the control unit controls the magnetization direction to be orthogonal to the geomagnetic direction.
In Paragraph 11, A method of operating a metal detection system in which, in the fifth step above, when the width of the hysteresis curve is relatively small, the determination unit determines that the metal is a non-ferrous metal.
In Paragraph 11, A method of operating a metal detection system in which, in the fifth step above, if the width of the hysteresis curve is relatively large, the determination unit determines that the metal is a ferromagnetic material.
In Paragraph 11, A method of operating a metal detection system in which the time difference when the magnetic sensor unit detects a change in hysteresis of the surrounding area in the 5th step after the magnetic sensor unit detects a change in hysteresis of the surrounding area in the 4th step is greater than the time difference when the magnetic sensor unit detects a change in hysteresis of the surrounding area after the magnetizing coil unit generates the magnetic flux in the 4th step.

Description

Metal Detecting System and Method of Operation {SYSTEM FOR DETECTING METAL AND METHOD FOR OPERATING THE SAME} The present invention relates to a metal detection system and a method of operating the same. More specifically, the present invention relates to a system that magnetizes a surrounding area and detects metal through a change in a hysteresis curve, and a method of operating the same. Materials are classified into diamagnetics, ferromagnetics, and paramagnetics based on their magnetism. Diamagnetics possess a very weak magnetism in the opposite direction when an external magnetic field is applied. In contrast, ferromagnetics acquire a strong magnetic field in the same direction when an external magnetic field is applied. Paramagnetics possess a magnetic field in the same direction when an external magnetic field is applied, but they lose their magnetic properties when the magnetic field is removed. Most metals fall into the categories of ferromagnetics or paramagnetics. Therefore, conventionally, metals were detected by sensing the frequency change that occurs when high-frequency power is supplied to an induction coil to magnetize the metal. However, this method had a limited detection range. That is, the detection range was limited to within the diameter range of the loop coil. As a result, it was difficult to detect metals at long distances or deep locations. FIG. 1 is a schematic block diagram of a metal detection system according to one embodiment of the present invention. Figure 2 is a schematic circuit diagram of the magnetic sensor unit included in the metal detection system of Figure 1. Figure 3 is a schematic example of a hysteresis curve used to determine whether a discriminator included in the metal detection system of Figure 1 is metal. Figures 4 and 5 are schematic conceptual diagrams of the arrangement of a metal detection system according to the N-pole direction of the Earth's magnetic field, respectively. FIG. 6 is a schematic flowchart of the operation method of a metal detection system according to one embodiment of the present invention. Figure 7 is a schematic time sheet of the operation method of the metal detection system of Figure 6. Figure 8 is a schematic diagram of an aircraft equipped with the metal detection system of Figure 1. Figure 9 is a schematic circuit diagram of the metal detection system of Figure 8. Figure 10 is a schematic diagram of a transport vehicle equipped with another metal detection system. Figure 11 is a schematic hardware structure diagram of the control unit included in the metal detection system of Figure 1. Embodiments of the present disclosure are described below with reference to the attached drawings so that those skilled in the art can easily implement them. However, the present disclosure may be embodied in various different forms and is not limited to the embodiments described herein. Furthermore, in order to clearly explain the present disclosure in the drawings, parts unrelated to the explanation have been omitted, and similar parts throughout the specification are denoted by similar reference numerals. In the specification, when a part is described as "including" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components. Furthermore, terms such as "...part," "...unit," and "...module" as used in the specification refer to a unit that processes at least one function or operation. In this specification, terms including ordinal numbers, such as first, second, etc., may be used to describe various components, but these components are not limited by these terms. These terms are used solely for the purpose of distinguishing one component from another. For example, without departing from the scope of the present disclosure, the first component may be named the second component, and similarly, the second component may be named the first component. In the flowchart described with reference to the drawings in this specification, the order of operations may be changed, several operations may be merged or some operations may be divided, and certain operations may not be performed. FIG. 1 schematically illustrates the block structure of a metal detection system (100) according to one embodiment of the present invention. The structure of the metal detection system (100) in FIG. 1 is merely for illustrating the present invention and is not limited thereto. Accordingly, the structure of the metal detection system (100) can be modified differently. As illustrated in FIG. 1, the metal detection system (100) includes a magnetizing coil section (10), a switching element section (20), a magnetic detection section (30), a magnetic sensor section (40), a discrimination section (50), and a control section (60). In addition, the metal detection system (100) may include other components. The magnetization coil section (10) generates magnetic flux and magnetizes the surroundin