KR101698834B1 - Bending mechanism for intrusion sensing apparatus and intrusion sensing apparatus including the same - Google Patents

Abstract

Provided is an apparatus for detecting a break-in using an optical loss change generated by bending of an optical fiber, capable of being applied to a large security area at low costs and having a simple structure but high break-in detecting ability. The apparatus for detecting a break-in comprises: a plurality of bending devices fixed to the ground; an optical fiber extending through the bending device; a pressurizing member connected with the bending device in a sliding manner; and an optical detector connected with one end of the optical fiber to transmit light and detect the returned light. The bending device includes: a body having a first guide groove; and a pressing member disposed in the first guide groove in a sliding manner. The optical fiber extends from a lower side of the pressing member. When the pressurizing member is pressed by a person who attempts a break-in, the pressurizing member pressurizes the pressing member and accordingly the pressing member presses a part of the optical fiber so that a bent part is formed at one portion of the optical fiber with the body.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a bending device for an intrusion detection device and an intrusion detection device including the same.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bending device for an intrusion detection device capable of detecting an intrusion of a security facility and an intrusion detection device including the same. More particularly, the present invention relates to an intrusion detection device using an optical fiber And an intrusion detection device including the same.

Generally, the intrusion detection device is used to detect the presence or absence of a fence wire mesh installed at the outskirts of a security facility, for example, a border line, a military facility, an airfield, a nuclear power plant, a gas oil store, a factory, a national confidential facility, a prison, It uses a method to detect the vibration that occurs when an intruder rides over. In such a case, for example, by attaching one or two optical fibers transversely to the fence, even if the intruder does not directly contact the optical fiber, for example, vibrations generated at a point where the fence wire mesh is separated by about 1 m, The optical fiber core is deformed, or the refractive index distribution is changed to change the phase or wavelength of the light traveling in the core, and the intrusion can be detected by monitoring the change (indirect detection method).

However, such a method may not be able to detect the vibration caused by the sensing cable when the intruder stimulates a point farther than 1 m from the sensing cable, and the natural phenomenon such as raindrops, wind, vehicle / Frequent malfunctions due to vibrations due to nearby animals, passers-by, thunder, and the like.

In addition, in the registered utility model publication No. 20-0420918, a fence-attached light network and a fixture are not able to detect when a fence-attached light network is not a concrete but a soft ground (soil, sand, gravel, mud, etc.) A method is disclosed in which a steel bar is tightly sandwiched in the ground and a head optical fiber of a fence is sandwiched and fixed to the head. However, a large amount of steel rods is required, and it takes a lot of construction cost to put it on the ground, and there is a limit that can not be applied to a vacant space without a fence.

In another method of detecting intrusion of a security facility, Korean Patent Laid-Open Publication No. 10-2005-0032124 discloses an intrusion detection apparatus using a time-domain reflection detection structure, and discloses an apparatus for detecting intrusion from bending (or bending) light loss . However, in the case of the intrusion detection apparatus disclosed herein, the structure of the structure capable of causing bending deformation is complicated and expensive, and is limited to intrusion detection at a point of about 1M in size, and a separate device There is a problem in that it is difficult to apply to a security area of an actual large security facility (for example, a security zone length L = several hundred meters to several ten kilometers).

As can be seen from the experimental data provided by the Korea Research Institute of Standards and Science (July 2002, Sensor Society Vol 11, No 4, 2002-11-4-03), for example, Samsung's optical fiber has a bending diameter The light loss is 19 dB to 1.0 dB. The smaller the bending diameter, the more exponentially. The bending diameter is 2 dB and the light loss is 15 dB. have).

Korean Utility Model Registration No. 20-042918 (June 30, 2006) Korean Patent Publication No. 10-2005-0032124 (April 07, 2005)

 In this paper, we propose an intrusion detection method using optical fiber ROTDR sensor.

Accordingly, the present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide an intrusion detection device capable of improving the intrusion detection ability by being able to be applied to a large- A bending mechanism and an intrusion detection device including the same are provided.

According to one aspect of the present invention, there is provided a bending apparatus comprising: a plurality of bending mechanisms fixed to the ground; An optical fiber extending through the bending mechanism; A pressing member slidably connected to the bending mechanism; And a photodetector connected to one end of the optical fiber for transmitting light and detecting light to be transmitted, wherein the bending mechanism includes: a body having a first guide groove formed therein; And a pressing member slidably disposed in the first guide groove, the optical fiber extending downwardly of the pressing member, and when the pressing member is pressed by the intruder, the pressing member presses the pressing member , The pushing member pushes a part of the optical fiber and forms a bend in a part of the optical fiber in cooperation with the body.

A second guide groove may be formed in the body, and the pressing member may be slidably connected to the second guide groove.

When seen from the upper side of the body, the first guide groove and the second guide groove may intersect with the plus shape (+).

The body may have a mounting hole through which the optical fiber passes.

The pressing member may be formed with an insertion hole through which the optical fiber passes.

The pressing member may include an upper overlapping portion and a lower overlapping portion at both ends.

The upper overlapping portion of one pressing member and the lower overlapping portion of the other pressing member may be connected to the bending mechanism.

According to another aspect of the present invention, Optical fiber; And a bending mechanism connected to one end of the optical fiber for transmitting light and detecting light to be transmitted, the bending mechanism comprising: a body having a first guide groove formed therein; And a pressing member slidably disposed in the first guide groove, the optical fiber extending downwardly of the pressing member, and when the pressing member is pressed by the intruder, the pressing member presses the pressing member Wherein the pushing member presses a portion of the optical fiber and cooperates with the body to form a bend in a portion of the optical fiber.

A second guide groove may be formed in the body, and the pressing member may be slidably connected to the second guide groove.

When seen from the upper side of the body, the first guide groove and the second guide groove may intersect with the plus shape (+).

The body may have a mounting hole through which the optical fiber passes.

The pressing member may be formed with an insertion hole through which the optical fiber passes.

The present invention can detect the appearance of an intruder who breaks into and penetrates the bottom of a fence in an area where a fence is installed or invades into a vacant space without a fence and can operate without warning and false alarms. It can be widely used as an unmanned security measure.

1 is a schematic plan view of an intruder alarm device according to an embodiment of the present invention,
2 is a partial side view schematically showing a state in which an intruder alarm device according to an embodiment of the present invention is installed in the ground;
3 is a partially exploded perspective view of an intruder alarm device according to an embodiment of the present invention,
4 is a partial side view showing an assembled state of a cable bending mechanism, a pressing member, and a pressing member of an intrusion alarm device according to an embodiment of the present invention,
5 is a partial side view schematically showing the operation principle of an intruder alarm device according to an embodiment of the present invention;
6 is a side view of a pressing member of an intrusion alarm device according to an embodiment of the present invention;

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings, and the advantages and features of the present invention and methods of achieving the same can be clearly understood.

It is to be understood that the present invention is not limited to the embodiments described below, but may be embodied in various forms other than those described in the following description without departing from the technical spirit of the present invention It will be apparent to those skilled in the art.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed and will become apparent to persons skilled in the art upon a reading of this disclosure. It is only defined by the claims.

On the other hand, well-known components, well known operations, and well-known techniques in some embodiments described below are not specifically described for the sake of brevity and for the sake of brevity.

It is also to be noted that like reference numerals refer to like elements throughout the specification and the terms used herein are intended to be illustrative of the embodiments and not to limit the invention.

In this specification, the singular forms include plural forms unless the context clearly dictates otherwise, and the constituents and acts referred to as " comprising (or having) " do not exclude the presence or addition of one or more other constituents and actions .

Unless defined otherwise, all terms (including technical and scientific terms) used herein may be used in a sense commonly understood by one of ordinary skill in the art to which this invention belongs.

Also, commonly used predefined terms are not ideally or excessively interpreted unless they are defined.

Referring to FIG. 1, there is shown a schematic plan view illustrating the overall configuration of an intrusion alarm apparatus according to an embodiment of the present invention. Referring to FIG. 2, an intrusion alarm apparatus according to an embodiment of the present invention is installed in the ground A schematic partial side view of the state is shown.

An intruder alarm device 100 according to an embodiment of the present invention includes a bending mechanism 10, a pressing member 20, an optical fiber 30, and a photodetector 40. The intruder alarm device 100 may be installed inside a fence such as a security facility, for example, a military facility, an airport, a nuclear power plant, or the like. As shown in Fig. 2, the plurality of bending mechanisms 10 are embedded in the ground at a predetermined interval, for example, 1.5 m, in the security zone L for detecting the intruder's intrusion, The optical fiber 30 and the pressing member 20 are connected to the optical fiber 10 and are covered with soil, sand or gravel to be positioned at a predetermined depth, for example, several cm from the surface 50, .

The optical fiber 30 passes through the plurality of bending mechanisms 10, and one end thereof is connected to the optical detecting section 40. As described later, a constant tension T may be applied to the optical fiber 30 as needed. As the optical fiber 3 of the present invention, for example, an optical fiber disclosed in a Utility Model Registration No. 20-0429342 entitled " Intrusion Detection Optical Cable for Optical Network "can be used. In this case, a structure having a 3 mm outer diameter surrounded by a Kevlar stiffener around the multi- Lt; / RTI >

Further, a pressing member 20 is slidably connected to the upper end portions of the plurality of bending mechanisms 10. At this time, the pressing member 20 may have a length corresponding to the interval of the bending mechanism 10, and the portion where the two pressing members 20 are connected to each other may be positioned at the upper end of the bending mechanism 10 have. The pressing member 20 can be buried in the ground to press the pressing member 14 (see Fig. 3), which will be described later, of the adjacent bending mechanism 10, for example, when the intruder presses it down. When the pressing member 14 is pressed in this way, the optical fiber 30 is severely bent in the bending mechanism 10 to significantly increase the optical loss, and the optical detecting unit 40 connected to one end of the optical fiber 3 And detect an intrusion.

Referring to Figure 3, an exploded perspective view of the bending mechanism 10 and the biasing member 20 is shown, and with reference to Figures 4 and 5, a schematic side view of the bending mechanism 10 and the biasing member 20 is shown do.

The bending mechanism 10 is a mechanism for receiving a pressure from the pressing member 20 to form a bent portion in a portion of the optical fiber 30. The bending mechanism 10 includes a plurality of bending mechanisms 10 As shown in Fig. The bending mechanism 10 can bend the optical fiber 30 to, for example, a bending diameter of 1 mm or less, thereby causing a light loss of about 15 dB. As described later, the bending mechanism 10 can simultaneously form four bends (①, ②, ③, and ④ in FIG. 5) in a short region of the optical fiber 30, And can be reliably detected by the detection unit 40. [

The bending mechanism 10 includes a body 11 to be grounded and a tip portion 12 can be formed at the lower end of the body 11 so as to be easily stuck on the ground. The body 11 may have, for example, a circular cross section having a diameter of 40 mm, and may be made of metal, reinforced plastic, or the like. In order to insert an elastic member, for example, a compression spring 13, an elastic member insertion hole 17 may be formed in the upper portion of the body 11 from the upper end to the lower end. Further, on the upper portion of the bending mechanism 10, a pressing member guide groove 15 is formed from the upper end to the lower side so that the pressing member 14, which will be described later, can slide. A pressing member guide groove 16 may be formed in the upper portion of the bending mechanism 10 from the upper end to the lower side so that the pressing member 20 can slide. The pressing member guide groove 15 and the pressing member guide groove 16 may be formed to have a width corresponding to the diameter or width of the body 11. In this case, It can be opened to the side. The length of the pressing member guide groove 15 may be longer than the length of the pressing member guide groove 16. This is because the pressing member 14 is disposed below the pressing member 20 and slides downward beyond the pressing member 20 when the pressing member 20 is pressed by the pressing member 20. As shown in FIG. 3, the pressing member guide groove 15 and the pressing member guide groove 16 may intersect with each other to have a '+' shape when viewed from above.

In addition, the body 11 may be provided with an optical fiber mounting hole 18 formed through the body 11. The mounting hole 18 may be formed to be positioned below the pressing member guide groove 16. The optical fiber 30 can extend through the insertion hole 19, which can be formed in the mounting hole 18 and the pressing member 14. In this case, as will be described later, when the pressing member 20 is pressed by the intruder, the pressing member 20 presses the pressing member 14 and presses the mounting hole 18 and the pressing member (1), (2), (3) and (4)) of the optical fiber 30 by cooperation of the insertion hole 19 of the pressing member 14, more specifically, A bending portion may be formed. Therefore, a light loss can be surely generated in the light to be conveyed, and a change in light loss can be reliably detected by the light detecting section (40).

An elastic member 13 can be inserted into the insertion hole 17 of the bending mechanism 10 and then a pressing member 14 for pressing the optical fiber 30 is inserted into the pressing member guide groove 15. Next, the pressing member 20 is inserted into the pressing member guide groove 16. When the pressing member 14 is pressed downward, the elastic member 13 generates a force for restoring the pressing member 14 upward (direction of arrow R).

The pressing member 14 is in the form of a plate having a predetermined thickness so as to be slidable in the guide groove 15, and the plane shape may be formed in a rectangular shape, for example. The pushing member 14 may be formed with an optical fiber insertion hole 19 in which the optical fiber 30 is held and pressed.

The pressing member 20 may have an upper overlapping portion 21 and a lower overlapping portion 22 at both ends, as shown in Fig. The upper overlapping portion 21 of one pressing member 20 and the lower overlapping portion 22 of the adjacent one pressing member 20 can be connected to overlap each other, And can be inserted into the member guide groove 16.

The optical detecting unit 40 transmits light to the optical fiber 30 and detects light transmitted from the optical fiber 30. For example, the photodetector 40 may include a light source of a laser diode, and may be optically contacted to one end of the optical fiber 30 to transmit the pulsed light to the optical fiber 30. For example, the photodetector unit 40 can detect pulsed light that is conveyed using Rayleigh scattering.

Hereinafter, the operation of the intrusion detection device 100 according to one embodiment of the present invention as described above will be described with reference to Figs. 4 and 5. Fig.

The upper overlapping portion 21 or the lower overlapping portion 22 of the pressing member 20 is pushed by the intruder so that the upper overlapping portion 21 or the lower overlapping portion 22 of the bending mechanism 10 And slides downward in the guide groove 16 to press the pressing member 14 downward. Then, the pushing member 14 is slid downward in the guide groove 15 to bend a part of the optical fiber 30. 5, if the optical fiber 30 is inserted into the mounting hole 18 of the bending mechanism 10 and extends through the insertion hole 19 of the pressing member 14, (1), (2), (3) and (4).

For example, the photodetector 40, which detects the pulsed light transmitted by using the Rayleigh scattering generated in the optical fiber 30, receives the transmitted light accompanying the light loss generated by the bending, By analyzing this, it is possible to grasp intruder's intrusion and intrusion position (the position of the bending mechanism 10).

On the other hand, when the intruder's foot is moved and the pressing force from the pressing member 20 pressed is removed, the pressing member 14 is moved upward (in the direction of the arrow R) by the restoring force of the elastic member 13, The member 20 is pushed upward and returned to its original position. Alternatively or in combination, by applying a constant tension T to the optical fiber 30, the pushing member 14 and the pressing member 20 may be returned to their original positions.

The embodiments of the present invention described above are intended to facilitate the understanding of the present invention. It is to be understood that changes or modifications that can readily be made by those skilled in the art, for example, Lt; / RTI > can be done in this embodiment without departing from the scope of the invention.

10: Optical fiber bending mechanism
11: Body
13: Elastic member
14: pressing member
15:
16: pressure member guide groove
17: Elastic member insertion hole
20: pressing member
21:
22: Lower overlapping portion
30: Optical fiber
40:
100: intrusion detection device

Claims (12)

A plurality of bending mechanisms fixed to the ground;
An optical fiber extending through the bending mechanism;
A pressing member slidably connected to the bending mechanism;
And a photodetector connected to one end of the optical fiber for transmitting light and detecting light to be transmitted,
The bending mechanism includes:
A body on which the first guide groove is formed; And
And a pressing member slidably disposed in the first guide groove,
Wherein the optical fiber extends downwardly of the pressing member,
Wherein the pressing member presses the pressing member when the pressing member is pressed by the intruder and the pressing member presses a part of the optical fiber to form a bent portion in a part of the optical fiber in cooperation with the body, . The intrusion detection device according to claim 1, wherein a second guide groove is formed in the body, and the pressing member is slidably connected in the second guide groove. The intrusion detection device according to claim 2, wherein the first guide groove and the second guide groove intersect with a plus shape when viewed from above the body. The intrusion detection device according to claim 1, wherein a mounting hole through which the optical fiber passes is formed in the body. The intrusion detection device according to claim 4, wherein an insertion hole through which the optical fiber passes is formed in the pressing member. The intrusion detection device according to claim 1, wherein the pressing member includes upper and lower overlapping portions at both ends. 7. The intrusion detection device according to claim 6, wherein the upper overlapping portion of one pressing member and the lower overlapping portion of the other pressing member are connected to the bending mechanism. A bending mechanism for an intrusion detection device, the intrusion detection device comprising: an optical fiber extending through the bending mechanism; A pressing member slidably connected to the bending mechanism; And a photodetector coupled to one end of the optical fiber for transmitting light and detecting light to be transmitted, the bending mechanism for the intrusion detection device comprising:
A body on which the first guide groove is formed; And
And a pressing member slidably disposed in the first guide groove,
Wherein the optical fiber extends downwardly of the pressing member,
Wherein the pressing member presses the pressing member when the pressing member is pressed by the intruder and the pressing member presses a part of the optical fiber to form a bent portion in a part of the optical fiber in cooperation with the body, Bending mechanism for. The bending mechanism for an intrusion detection device according to claim 8, wherein a second guide groove is formed in the body, and the pressing member is slidably connected in the second guide groove. The bending mechanism for an intrusion detection device according to claim 9, wherein the first guide groove and the second guide groove intersect with a plus shape when viewed from above the body. The bending mechanism for an intrusion detection device according to claim 8, wherein a mounting hole through which the optical fiber passes is formed in the body. 12. The bending mechanism for an intrusion detection device according to claim 11, wherein an insertion hole through which the optical fiber passes is formed in the pressing member.

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