KR101192445B1 - optical fiber sensor network with fixed bracket for maintaining grating shape, instruction detecting apparatus and method using the se1ssor network - Google Patents

Abstract

The optical fiber sensor network is installed in the guard area, and the optical fiber sensor network is formed in the form of a plurality of optical fibers woven in the form of a plurality of grids, and fixing covers are embedded in a plurality of positions to maintain each grid. It is installed. The intrusion detection device detects an initial alarm state for removing the fixing cover based on the optical signal output based on the optical fiber sensor network. After the initial alarm condition is detected, it is detected whether a substantial intrusion has occurred based on a value of signal groups composed of optical signals estimated to be due to intrusion occurrence.

Description

Optical fiber sensor network with fixed bracket for maintaining grating shape, instruction detecting apparatus and method using the se1ssor network

The present invention relates to an intrusion detection apparatus and a method thereof, and more particularly, to an optical fiber sensor network using a grid cover for holding the grid, and an intrusion detection apparatus and method using the same.

Recently, a device for detecting an intrusion using an optical fiber has been developed and used. Such a device uses a change in intensity or frequency of light transmitted by external pressure as light is transmitted in an optical fiber.

Conventional intrusion detection apparatus using the optical fiber mainly determines whether the intrusion occurred by comparing the intensity and the set value of the light received through the optical fiber installed in the guard zone, or mutual interference occurs in the light transmitted through the optical fiber at the receiving side It is determined whether an intrusion has occurred depending on whether a change occurs in the average current of the measured light. However, the conventional intrusion detection device has a disadvantage that the error rate is high.

The problem to be solved by the present invention is to provide an optical cable sensor network that is not easy to remove the optical fiber for intrusion.

Another object of the present invention is to provide an apparatus and method for accurately detecting whether an intrusion occurs based on a pattern change of a signal detected using the sensor network.

For the above problem, the intrusion detection method according to a feature of the present invention, the intrusion detection method for performing the intrusion detection by a device using an optical fiber sensor network installed in the guard area, the optical fiber sensor network is a plurality of optical fibers It is made in the form of woven in the form of a grid, the fixing cover is installed in the form of embedding the optical fiber in a plurality of positions in order to maintain each grid.

The intrusion detection method may include: detecting, by the device, signal patterns of optical signals output from the optical fiber sensor network; Detecting an initial alarm condition of removing the fixed cover installed in the optical fiber sensor network for intrusion based on the detected signal pattern; And detecting a final alarm state in which an intrusion occurs based on a signal pattern of optical signals output from the optical fiber sensor network after the initial alarm condition is detected.

Intrusion detection apparatus according to another feature of the present invention is an intrusion detection device for detecting an intrusion by using an optical fiber sensor network installed in the guard area, the optical fiber sensor network is a form in which a plurality of optical fibers are woven in the form of a plurality of grids. It consists of, the fixing cover is installed in the form of embedding the optical fiber in a plurality of positions in order to maintain each grid.

The intrusion detection device, the light source for supplying an optical signal to the optical fiber sensor network; An optical detector detecting the optical signals output from the light source island sensor network and outputting a corresponding signal; And a discriminating unit detecting an initial warning state for removing a fixed cover installed in the optical fiber sensor network for intrusion and a final warning state for intrusion based on a signal pattern of optical signals output from the light detecting unit.

According to still another aspect of the present invention, an optical fiber sensor network includes: a plurality of optical fibers crossing each other to form a plurality of grating shapes; And a plurality of fixing covers each formed at a position forming the lattice form, and maintaining the lattice form by embedding an optical fiber at a corresponding position.

The fixing cover may include a first guide part in which one optical fiber is disposed; Another optical fiber is disposed, the second guide portion is formed to cross the first guide portion and the first point and the first point; A first protrusion including a plurality of protrusions respectively formed along the first guide portion; The second protrusion may include a plurality of protrusions formed along the second guide portion.

According to an embodiment of the present invention, by determining whether an intrusion occurs based on the pattern of the optical signal detected through the optical fiber in the optical fiber sensor network, it is possible to more accurately detect that the actual intrusion occurs.

In addition, since the optical fiber sensor network is woven as the optical fibers cross each other to form a lattice shape, and a fixing cover for maintaining each lattice shape is coupled to the optical fiber, cutting or damaging the optical fiber for intrusion is not easy. In addition, by detecting the initial alarm state to remove the fixed cover installed in the optical fiber sensor network, it is possible to easily detect the preparation step before the actual intrusion occurs, and to deal with the intrusion later. Therefore, conventionally, the optical fiber is stretched to detect only a state where a substantial intrusion occurs, whereas according to an exemplary embodiment of the present invention, a preparation state for intrusion may be more effectively detected before a substantial intrusion occurs.

In addition, when the initial alarm state is detected, the weight for determining the final alarm state corresponding to the actual intrusion may be changed to detect the intrusion occurrence more precisely and accurately.

1 is a view showing the structure of an intrusion detection apparatus according to an embodiment of the present invention.
2 is a view showing the structure of an optical fiber sensor network according to an embodiment of the present invention.
FIG. 3 is a view showing a lattice holding fixing cover formed on the optical fiber shown in FIG. 2.
4 is a plan view of the fixing cover according to an embodiment of the present invention.
5 is a perspective view of the coupling of the fixing cover according to an embodiment of the present invention.
6 is a coupling diagram of each module of the fixing cover according to an embodiment of the present invention.
7 is a diagram illustrating a structure of a discriminating unit according to an exemplary embodiment of the present invention.
8 is a graph illustrating an optical signal detected when the fixing cover is removed in an embodiment of the present invention.
9 is a graph illustrating a signal group detected in an embodiment of the present invention.
10 is a view showing an implementation of an intrusion detection apparatus according to an embodiment of the present invention.
11 and 12 are flowcharts illustrating an intrusion detection method according to an exemplary embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. In the following detailed description of the preferred embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. In the drawings, like reference numerals are used throughout the drawings.

In addition, in the entire specification, when a part is referred to as being 'connected' to another part, it may be referred to as 'indirectly connected' not only with 'directly connected' . Also, to "include" an element means that it may include other elements, rather than excluding other elements, unless specifically stated otherwise.

Hereinafter, an optical fiber sensor network, an intrusion detection system using the same, and a method thereof according to embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a view showing the structure of an intrusion detection system according to an embodiment of the present invention.

Intrusion detection system 1 according to an embodiment of the present invention is a light source 10, 11, the optical fiber sensor network 20 for transmitting the optical signal emitted from the light source, the light transmitted through the optical fiber sensor network 20 It includes a light detector 30, 31 for receiving a signal and detecting the intensity of the received optical signal, and a determination unit 40 for determining whether the intrusion based on the signal output from the light detector. In addition, the control unit 50 may further include a driving controller 50 for adjusting the optical signal output from the light sources 10 and 11.

The optical fiber sensor network 20 includes a plurality of optical fibers, and the plurality of optical fibers are woven in a lattice form as the plurality of optical fibers cross each other.

2 is a view showing the structure of an optical fiber sensor network according to an embodiment of the present invention, Figure 3 is a view showing a grating holding fixing cover is formed in the optical fiber shown in FIG.

As shown in FIG. 2, a plurality of optical fibers, for example, at least two optical fibers 21 and 22 cross each other and are woven in a grid to form an optical fiber sensor network 20 according to an embodiment of the present invention. Therefore, a plurality of gratings are formed in the optical fiber sensor network 20.

Particularly, in the embodiment of the present invention, a fixing cover is used to maintain a grid shape of the optical fibers 21 and 22 that are woven as shown in FIG. 2, and FIG.

The grid retaining cover 23 according to the embodiment of the present invention is positioned at the point where the two optical fibers 21 and 22 cross each other, and the optical fibers 21 and 22 cross each other through the fixing cover 23. Will remain intact. In particular, as shown in FIG. 3, one grid is formed by four crossing points at which the optical fibers 21 and 22 cross each other, and the optical fibers 21 and 22 maintain the crossed state through the fixing cover 23. The lattice shape is maintained accordingly. In this case, the optical fiber is implemented to be embedded in the optical cable.

The fixing cover 23 has the following structure.

4 is a plan view of a fixing cover according to an embodiment of the present invention, Figure 5 is a perspective view of the fixing cover according to an embodiment of the present invention.

The fixing cover 23 according to the embodiment of the present invention includes first and second guide parts 231 and 232 on which the optical fiber is disposed, and protrusions 233 and 234 including a plurality of protrusions formed along the guide part. . In FIG. 4, S1 represents a first surface of the fixing cover 23, and S2 represents a second surface opposite to the first surface of the fixing cover 23.

The first guide part 231 and the second guide part 232 are formed of elliptical grooves, and the first guide part 231 and the second direction (the opposite of the first direction) are formed in an elliptical shape convex in the first direction. Direction is formed so as to intersect with each other. As shown in FIG. 4, the first guide part 231 and the second guide part 232 intersect through the first point P1 and the second point P2, respectively, and the first point P1 and the second point. Due to the elliptic shape between (P2), the first guide portion 231 and the second guide portion 232 is positioned in a predetermined distance spaced. First openings 231a and 232a and second openings 231b and 232b for respectively passing optical fibers are formed at both ends of the first guide part 231 and the second guide part 232, respectively.

Particularly, in the embodiment of the present invention, protrusions 233 and 234 are formed to easily detect a change in pressure applied to the optical fiber on the first guide part 231 and the second guide part 232 having the above-described configuration. It is. As shown in FIG. 4, the protrusions 233 and 234 are formed of a plurality of protrusions formed along the grooves of the guide portion at predetermined intervals. Accordingly, one optical fiber is disposed along the first guide part 231 through the first opening 231a, and is close to the protrusion 233 formed in the first guide part 231. Is output via In addition, the other optical fiber is disposed along the second guide portion 232 through the second opening portion 232a and is in close contact with the protrusion 234 formed in the second guide portion 232 and through the second opening portion 232b. Is output.

In addition, the first and second guide parts 231 and 232 and the protrusions 233 and 234, as described above, are formed on the first surface S1 of the fixing cover 23, and the first surface S1 is the opposite side of the first surface S1. On the second surface S2, as shown in FIG. 4, anti-slip portions 235 and 236 for preventing slip during the manufacturing process may be formed.

The non-slip parts 235 and 236 are formed of protrusions of a circular shape, and the non-slip parts 235 and 236 are disposed on the second surface S2 at predetermined intervals. In this case, the anti-slip part 235 may be formed at a position corresponding to the first point P1 of the second surface S2, and the non-slip part 236 may be a second point of the second surface S2. It may be formed at a position corresponding to (P2). The non-slip parts 235 and 236 are implemented to prevent the fixing cover 23 from slipping during the manufacturing process or to be coupled to a separate fixing support of a manufacturing apparatus (not shown), thereby making the manufacturing process easier. Can be lost.

Meanwhile, as shown in FIG. 5, the fixing cover 23 may have a form in which the first module M1 and the second module M2 are combined. In this case, each module M1, M2 includes the first and second guide portions 231,232, the projections 233,234, the first and second openings 231a, 231b, 232a, and 232b, as described above. Anti-slip parts 235 and 236.

As shown in FIG. 5, the first module M1 and the second module M2 are coupled to each other to form a fixed cover. For this purpose, each module M1 and M2 includes a first coupling part 237. ) And the second coupling part 238 are formed. The first coupling part 237 formed in each module M1 and M2 has a protrusion shape, and the second coupling part 238 has a groove shape corresponding to the protrusion shape. Therefore, the first coupling portion formed in the first module M1 is coupled with the second coupling portion formed in the second module M2, and the second coupling portion formed in the first module M1 is formed in the second module M2. It is combined with the first coupling portion.

6 is a coupling diagram of each module of the fixing cover according to an embodiment of the present invention.

As the first module M1 and the second module M2 are coupled by the first coupling part 237 and the second coupling part 238, the first and second formed in the first module M1. The guide part and the first and second guide parts formed on the second module M2 are respectively located to correspond to each other. In addition, as the first and second guide parts have a groove shape, one optical fiber 21 is formed in a space formed by the first guide part of the first module M1 and the first guide part of the second module M2. Is built in, another optical fiber 22 is embedded in a space formed by the second guide portion of the first module (M1) and the second guide portion of the second module (M2), each of the modules (M1, M2) Two optical fibers intersect at the first point P1 and the second point P2 by the first guide part and the second guide part.

In particular, the pressure applied to the fixing cover 23 from the outside by the protrusions formed on the first and second guide portions of each module M1 and M2 is transmitted to the optical fiber that is more easily embedded. Therefore, when an intruder applies pressure to the fixing cover 23 to remove the fixing cover 23, each protrusion of the protrusion formed on the fixing cover 23 presses the optical fiber, so that the optical signal transmission characteristic of the optical fiber is changed. Will occur. In addition, even when the optical fiber is pulled by an external force, as the optical fiber is stretched, the pressure applied by the protrusion of the protrusion increases to the optical fiber, so that each protrusion of the protrusion presses the optical fiber, causing a change in the optical signal transmission characteristics of the optical fiber. do. In addition, when the intruder removes the fixing cover 23, the protrusion of the fixing cover 23, which is in contact with the optical fiber, is detached from the optical fiber, so that a predetermined pressure applied to the optical fiber is removed, thereby causing a change in the optical signal transmission characteristic of the optical fiber. Done. The fixing cover 23 may be installed in the optical fiber sensor network 20 in the form of fusion with the optical cable in which the optical fiber is embedded through ultrasonic welding. In the embodiment of the present invention, it is determined whether an intrusion occurs while detecting a signal pattern based on a change in a transmission characteristic of an optical signal, which will be described in more detail later.

Determination unit 40 for determining whether the intrusion is based on the optical signal transmitted through the optical fiber sensor network 20 as described above has a structure as follows.

7 is a diagram illustrating a structure of a discriminating unit according to an exemplary embodiment of the present invention.

As shown in FIG. 7, the determination unit 40 of the intrusion detecting apparatus 1 according to an exemplary embodiment of the present invention detects a change in a signal pattern of an optical signal based on signals output from the optical detectors 30 and 31. Based on this, it is determined whether an intrusion occurs. To this end, the determination unit 40 includes a first determination unit 41 for determining an initial alert state and a second determination unit 42 for determining a final alert state. In addition, the apparatus further includes a weight setting unit 43 for setting a weight for accurately detecting whether an intrusion has occurred or changing a weight set when it is determined as an initial warning state.

In an exemplary embodiment of the present invention, an initial alert state and a final alert state are detected based on a signal pattern according to a change in the detected optical signal. The initial alert state indicates that the intrusion does not occur substantially, but the preparation action for intrusion is being applied to the optical fiber sensor network 20, and the final alert state indicates that the substantial operation for invading the optical fiber sensor network 20 is the optical fiber sensor. The state applied to the network 20 is shown.

In this case, the initial alarm state is to remove the grating maintenance fixing cover 23 installed in the optical fiber sensor network 20 in order to enter the third party who is not authorized to enter the guard area where the optical fiber sensor network 20 is installed. It shows the state which detected that. In the optical fiber sensor network 20 according to the embodiment of the present invention, as shown in FIG. 3, a grid cover fixing cover 23 is installed at a plurality of positions of the optical fiber sensor network organized in a grid shape, and the optical fiber has a fixing cover ( 23) By being coupled in a form that does not move while being embedded inside, in order to pass through the optical fiber sensor network 20, the fixing cover 23 must first be removed.

That is, the optical fiber is not stretched even if a predetermined force or less is applied in the state where the fixing cover 23 is not removed. You can increase it to a size you can. In addition, in the case of pulling the cable with the optical fiber embedded with the allowable force without removing the fixing cover 23, the protrusion formed in the inside of the fixing cover 23, the optical fiber and the fixing cover 23 are fused together. In this state, the optical fiber is cut or the optical fiber is stretched.

According to the embodiment of the present invention, a step of removing the fixing cover 23 is detected as a kind of preparation step for a third party to invade, and when such an operation is detected, it is determined as an initial alarm state in which a preparation operation for substantial intrusion is performed. More precise monitoring By doing so, we want to make the monitoring more efficient and accurate. In particular, when an initial warning condition is detected, it is determined that a substantial intrusion is more likely to occur afterwards, so that the incidence of intrusion is more accurately determined by changing a weight assigned to the detected optical signal. After the initial warning condition, the third party can invade the grid shape that the third person has stretched and maintained to a size enough for the third person to pass through, so the change pattern of the optical signal detected from the optical fiber is analyzed using the weight. To determine if the last intrusion occurred. In particular, when a third party repeatedly detects an action such as pulling the optical fiber by the pattern of the optical signal detected after the initial warning state, it is determined that the final warning state is performed, and the subsequent countermeasure operation is performed.

Therefore, conventionally, the optical fiber is stretched to detect only a state where a substantial intrusion occurs, whereas according to an exemplary embodiment of the present invention, a preparation state for intrusion may be more effectively detected before a substantial intrusion occurs.

The operation of the determination unit 40 according to an embodiment of the present invention will be described in more detail.

8 is a graph illustrating an optical signal detected when the fixing cover is removed in an embodiment of the present invention.

When the fixing cover 23 is not removed from the optical fiber sensor network 20, as in the normal operation state illustrated in FIG. 8, the patterns of the detected optical signals vary slightly within a setting range based on a predetermined value. Represented by However, when the fixing cover 23 is removed, a high frequency signal is generated as the fixing cover 23 is separated from the optical fiber as in the fixing cover removing state shown in FIG. 8. That is, the high frequency signal more than the predetermined value larger than the predetermined value appears to vary while exceeding the setting range based on the set value. The amount of the generated high frequency signal may vary depending on the fusion state of the fixing cover 23 and the optical fiber and the removal attempt form.

According to an embodiment of the present invention, the first determination unit 41 may set the first set number of times when the intensity of the optical signal output from the light detectors 30 and 31 is greater than the first set value. If abnormality is detected, it is determined that the fixing cover 23 is an initial warning state, which is a preparation step for being a chip such as being separated from the optical fiber sensor network 20. For example, when a high frequency signal having a first set value or more is detected two or more times, it is determined as an initial alarm state. In addition, the first determination unit 41 sets the intensity value of the optical signal detected at the time determined as the initial warning state as the initial alarm value and transmits it to the second determination unit 42. For example, when the first optical signal and the second optical signal exceeding the first set value are detected, respectively, the intensity of the first optical signal and the intensity of the second optical signal are set to an initial alarm value, and the set initial alarm is set. The value is transferred to the second determination unit 42.

The weight setting unit 43 sets a weight added to a signal output from the light detectors 30 and 31 to detect the intrusion, and in particular, sets the weight to a higher value than the normal operating state when the initial alarm state is reached. . The weight value according to an embodiment of the present invention includes at least one of a first weight value and a second weight value for an environment in which the optical fiber sensor network 20 is installed, and a third weight value to detect a normal operating state. Here, the first weight is a weight based on the intensity of the optical signal that can be generated by the installed environment, and the second weight is a weight based on the time when the optical signals that can be determined to have been invaded by the installed environment are generated. . The first weight value, the second weight value, and the third weight value may be changed in a form of increasing or decreasing a predetermined value when an initial alarm state is detected from the given initial value, and different initial values according to an environment in which an optical fiber sensor network is installed. It can be changed or changed to different increase or decrease amounts.

The second determiner 42 applies a weight to the intensity of the optical signal output from the light detectors 30 and 31 and determines whether an intrusion has occurred based on the intensity values of the weighted optical signal.

Even if the fixing cover 23 is removed from the optical fiber sensor network 20, the optical fiber maintains a lattice shape, and in this state, the third member deforms the grid shape of the portion where the fixing cover is removed to pass through the optical fiber sensor network 20. If the optical fiber is pulled or bent by another fixing cover to maintain the shape of the adjacent grid, the change of the optical signal occurs. Even if all the fixing covers installed on the optical fiber sensor network 20 are removed, the optical fiber sensor network is generally implemented in a form in which an optical fiber is fixed to a steel pipe that functions as a support. The optical fiber is pulled or bent. Accordingly, a change occurs in the signal output from the optical fiber, and the second discriminating unit 42 determines the final alarm state according to the change in the intensity value of the optical signal detected in the initial alarm state.

In order to determine the final alert state, the second discriminator 42 uses the intensity of the optical signal output from the light detectors 30 and 31, the initial alert value transmitted from the first discriminator 41, and a weight. . If the initial alarm condition is not detected, the initial alarm value may be "0".

On the other hand, regardless of the intrusion of a third party in the environment in which the optical fiber sensor network 20 is installed, it may be affected by the natural environment such as rain, wind, animals, in this case, a change may occur in the detected optical signal have. For example, pressure may be applied to the optical fiber or the fixing cover 23 due to rain or wind, and thus a change may occur in the optical signal output through the optical fiber, and even when the animal catches or touches the optical fiber, the optical signal may change. May occur. However, compared to the optical signal generated by the natural environment, the pattern of the optical signal generated by the intrusion of a person has the following characteristics.

1) The optical signal has a relatively low frequency characteristic.

2) There is a high probability of initial alarm condition due to the removal of the fixing cover.

3) The maximum value of the detected optical signal is relatively high.

4) A large number of signal groups are generated, and the period in which the signal groups are generated is relatively constant.

Here, the signal group refers to optical signals having a value greater than or equal to the second set value. The first setting value corresponding to the initial alarm state and the second setting value for the signal group may be the same or may be different from each other.

9 is a graph illustrating a signal group detected in an embodiment of the present invention.

When an invasion occurs by a person, optical signals having the characteristics as shown in FIG. 9 are detected. That is, as shown in FIG. 9, signal groups including optical signals having a second set value or more are repeatedly generated at predetermined intervals, and the intervals between the respective signal groups are generated almost similarly.

Therefore, according to an embodiment of the present invention, the signal groups are detected, the value of the detected signal group is calculated, and it is determined whether an intrusion has occurred using the calculated signal group value and the initial alarm value.

To this end, as shown in FIG. 7, the second determination unit 42 determines whether an intrusion occurs based on the signal group detection module 421, the signal group value calculation module 422, the determination value calculation module 423, and the determination value. Determination module 424 to determine the.

The signal group detection module 421 has an intensity of an optical signal output from the optical detectors 30 and 31 that is greater than or equal to a second set value, and optical signals having such an intensity are signal frequencies that are determined to be invasive by a first interval (eg, human intrusion). If it is detected in the above), the detected optical signals are set as one signal group. One signal group may include optical signals as illustrated in FIG. 9. When an optical signal having an intensity greater than or equal to the second set value is detected at an interval greater than the first interval, the optical signals that are greater than or equal to the second predetermined value that is subsequently detected and are within the first interval are detected based on the detected optical signal. It is defined as Accordingly, at least one signal group can be detected, and each signal group includes optical signals having an intensity greater than or equal to a second predetermined value. The occurrence interval between these signal groups is called "occurrence period".

The signal group value calculation module 422 calculates a signal group value based on the strength of optical signals included in each signal group.

In an embodiment of the present invention, the signal group value is calculated based on the following method. Here, the calculation process is divided as follows according to the number of signal groups and the generation period, which is an interval between the previous signal groups, and the corresponding signal group values are calculated using different methods for each calculation process.

1) When the signal group is the set-up group (for example, the third) or more, and the generation period with the previous signal group is included in the preset setting period.

[Equation 1]

Signal Group Value = {Number of Signal Groups × (Signal Group Maximum × First Weight)} + (Signal Group Hold Time × Second Weight)

Here, the signal group maximum value represents the maximum value of the intensity of the optical signals included in the signal group. The signal group holding time T represents the time between the time when the first optical signal of the corresponding signal group is detected and the time when the last optical signal is detected (see FIG. 9). The signal group number indicates the number of detected signal groups.

The first weight is a weight based on the intensity of the optical signal that can be generated by the installed environment, and the second weight is a weight based on the time when the optical signals that can be determined to have been invaded by the installed environment are generated. .

2) When the signal group is a group lower than the setting second (for example, the third), or the signal group is higher than the setting (for example, the third), but the occurrence period with the previous signal group is not included within the preset setting period. If not

&Quot; (2) "

Signal group value = (signal group maximum × first weight) + (signal group holding time × second weight)

In this way, with respect to the signal group to be detected, it is determined which calculation process corresponds to which of the detected signal groups and the generation period which is an interval from the previous signal group is included in the setting period, The value of the corresponding signal group is calculated by the corresponding method. Hereinafter, for convenience of explanation, a method of calculating a signal group value according to Equation 1 is referred to as a "first calculation method", and a method of calculating a signal group value according to Equation 2 is referred to as a "second calculation method". Name it.

The determination value calculation module 423 calculates a determination value for determining the final alarm state based on the calculated signal group value.

The determination value according to an embodiment of the present invention may be calculated as follows.

&Quot; (3) "

Discrimination value = Initial alarm value + Signal group value (G1) +… + Signal group value (Gn)-(steady time x third weight)

Herein, n represents a positive integer, and the determination value is accumulated by adding up values of the detected signal group each time a signal group is detected.

The steady state maintenance time is used to accurately detect the occurrence of an intrusion, and serves as a value for initializing the discrimination value to the normal state.

More specifically, in order to intrude into the guard area through the optical fiber sensor network 20, when the intrusion is performed such as acknowledging or cutting the optical fiber, signal groups composed of the optical signals as described above are detected. do. When a person wants to invade, the intrusion is repeatedly performed. In general, once the intrusion is performed, the intrusion behavior is not shown again after a long time. Therefore, when the signal group is not detected for a long time after the signal group is detected, a value for initializing the determination value to the normal state is required. For example, in the normal state, if the determination value is "0", if no signal group is detected for a predetermined time, an initialization value for initializing the determination value composed of the detected signal group values to "0" is required. .

Here, (normal state holding time × third weight) functions as an initialization value, and the normal state holding time corresponds to the case where no intrusion occurs, and the signal group is set to elapse after the signal group is detected. If not, it may be determined to be in a normal state, and may be a time in which a state in which a signal group is not detected is maintained from a time point determined to be a normal state. Alternatively, the next signal group may not be detected so that the set time elapses from the time when the signal group is detected. The third weight may also have a different value depending on the environment in which the optical fiber sensor network is installed, and may be a value that varies depending on other conditions. On the other hand, when the determination value becomes "0", the number of signal groups is changed to zero.

The determination module 424 determines whether the intrusion occurred in the final alarm state based on the calculated determination value. For example, if the discrimination value is equal to or greater than the final alarm value that is determined to be an intrusion, it is determined that the intrusion has occurred, and when the discrimination value is smaller than the final alarm value, the intrusion does not occur. If it is determined that an intrusion has occurred, the intrusion detecting device 1 operates in a final alarm state, and thereafter, a separate alarm action (for example, an operation of ringing an alarm in a guard zone where an optical fiber sensor network is installed) or an intrusion occurrence Actions (eg, an operation of notifying the occurrence of an intrusion to the terminal of the security officer) may be performed.

Intrusion detection device 1 according to an embodiment of the present invention having a structure as described above is implemented in the form as shown in Figure 10, can be installed in a plurality of security zones.

10 is a view showing an implementation example of the intrusion detection apparatus 1 according to an embodiment of the present invention.

As illustrated in FIG. 10, a plurality of intrusion detection apparatuses including a fiber optic sensor network according to an embodiment of the present invention (1-1, 1-2, ..., 1-N, where N is a positive integer) In different guard zones. Each intrusion detection device (1-1, 1-2, ..., 1-N) divides the guard zone into a plurality of zones (zone1, zone2, ..., zone9) and installs an optical fiber sensor network in each of the plurality of zones. The optical signal is supplied to the optical fiber sensor network and the optical signal output from the optical fiber sensor network is detected and processed as described above to detect the initial alarm condition and the final alarm condition.

The central control unit 2 detects whether an invasion has occurred in the guard zone based on the respective information provided from the plurality of intrusion detecting apparatuses 1-1, 1-2, ..., 1-N. The central control unit 2 and the plurality of intrusion detecting apparatuses 1-1, 1-2, ..., 1-N can form an annular communication network. The central control unit 2 may be connected to the situation room via a wired or wireless network, so that the monitoring results for each of the guard zones may be transmitted to the situation room so that the coping process with respect to the guard zone where the intrusion occurs may be promptly performed. However, this is only one example, and intrusion detection apparatuses may be implemented and used in various forms.

Next, an intrusion detection method according to an embodiment of the present invention will be described based on the structure as described above.

11 and 12 are flowcharts illustrating an intrusion detection method according to an exemplary embodiment of the present invention. 11 and 12 are only examples, and the present invention is not necessarily limited to the illustrated flow.

The intrusion detection apparatus 1 according to the embodiment of the present invention is installed in a predetermined guard zone, and an optical signal is supplied to the optical fiber sensor network 20 in which a plurality of grating forms are formed, and the monitoring of the guard zone is started. .

As shown in FIG. 11, the photo detectors 30 and 31 process the optical signal output from the optical fiber sensor network 20 and transmit the processed optical signal to the determination unit 40 (S100). It is determined whether intrusion occurs based on the signal pattern of the optical signal detected as described above (S110).

The determination unit 40 detects an intensity of the detected optical signal equal to or greater than the first set value (S120) and detects an optical signal equal to or greater than the first set value (for example, two times) (S130). It is determined that the initial cover state such that the fixing cover installed in the 20 is removed (S140). When an initial alarm condition is detected, an alarm action (e.g., an alarm in a guarded area with a fiber optic sensor network) or actions to cope with the occurrence of an intrusion (e.g. fixed by the guard's terminal in the guarded area) An operation of informing that the operation of removing the cover is detected, etc. may be performed.

If it is determined that the initial alarm state, the determination unit 40 calculates an initial alarm value indicating the initial alarm state (S150). In addition, a process of increasing a weight for determining an intrusion occurrence from an initial value corresponding to a normal state to a value corresponding to an initial alarm occurrence state may be performed. In this process, the value of the signal group detected according to the intrusion and the first to third weights for the discrimination value may be increased by a predetermined amount from the corresponding initial value. In this case, an increase amount increased for each weight may be different. Therefore, after the initial alarm condition is detected, the incidence of intrusion is more sensitively and precisely checked by a higher weight than the initial alarm condition is not detected.

Thereafter, the determination unit 40 continuously detects the optical signal in the initial alarm state and checks the signal pattern change (S180). On the other hand, even when the conditions of the above steps (S120, S130) are not satisfied (not in the initial alarm state), the optical signal is continuously detected to check the pattern change of the signal.

If the intensity of the detected optical signal is greater than or equal to the second set value (S170), and the optical signals greater than or equal to the second set value are detected within a first interval (corresponding to a signal frequency determined to be a human intrusion) (S180), The optical signals to be set as one signal group (S190). Subsequently, in order to detect optical signals included in one signal group, steps S170 and S180 may be repeatedly performed, and may be implemented based on the above description, and thus detailed description thereof will be omitted.

When one signal group is detected, as shown in FIG. 12, the determination unit 40 determines which group is the detected signal group (S200). The value of the corresponding signal group is calculated according to the calculation method (S210). On the other hand, if the detected signal group is greater than or equal to the set number, the generation period, which is the interval between the detected signal group and the previously detected signal group, is compared with the preset set period (S220).

If the detected signal group is greater than or equal to the set time and the generation period is less than or equal to the set period, the value of the signal group is calculated according to the first calculation method (S230). In addition, when the detected signal group is greater than or equal to the set period but the generation period is greater than the set period, the value of the corresponding signal group is calculated according to the second calculation method (S210).

The determination unit 40 calculates a value for the detected signal group, and then calculates a determination value based on the initial alarm value and the calculated signal group value, and measures the steady state holding time according to Equation 3 In addition, the determination value is calculated in consideration of (S240). In this case, when the signal groups are continuously detected within the set time, the steady state holding time is "0", and thus, the steady state holding time does not affect the discrimination value when the signal groups are detected.

The determination unit 40 compares the calculated determination value with a preset final alarm value (S250), and if the determination value is greater than or equal to the final alarm value, determines that an intrusion has occurred (S260), and the determination value is greater than the final alarm value. In the case of a small case, it is determined that no intrusion occurs.

If it is determined that an intrusion has occurred, the intrusion detecting device 1 operates in a final alarm state, and thereafter, a separate alarm action (for example, an operation of ringing an alarm in a guard zone where an optical fiber sensor network is installed) or an intrusion occurrence Operations (for example, an operation of notifying the occurrence of an intrusion to the terminal of the security officer) may be performed (S270).

On the other hand, when the calculated determination value is smaller than the final alarm value, the process returns to step S180 or step S190 to repeatedly perform the optical signal detection process and the alarm state determination process as described above.

Although the present invention has been described and illustrated in detail, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limiting the scope of the present invention. Readable recording medium. The present invention can be easily implemented by those skilled in the art from the description of the embodiments described above.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It belongs to the scope of right.

Claims (20)

In the intrusion detection method in which the device using the optical fiber sensor network installed in the guard zone performs intrusion detection,
The optical fiber sensor network is formed of a plurality of optical fibers are woven in the form of a plurality of gratings, the fixing cover for maintaining the grating form in each of the grating is connected to each other in the form of a built-in optical fiber,
The device detecting a signal pattern of optical signals output from the optical fiber sensor network;
When the detected signal pattern indicates a signal change according to a change in pressure applied to the optical fiber by a fixing cover installed in the optical fiber sensor network, determining that an initial alarm condition occurs in which the fixing cover is removed; And
Detecting, after the initial alarm condition is generated, a final alarm condition in which an intrusion occurs based on a signal pattern of optical signals output from the optical fiber sensor network;
Including, intrusion detection method. The method of claim 1, wherein
Determining that the initial alarm condition has occurred
And determining that an initial alarm condition has occurred when an optical signal according to the detected signal pattern is greater than or equal to a first preset value and an optical signal that is greater than or equal to a first preset value is detected more than a preset number of times. The method according to claim 2, wherein
Determining that the initial alarm condition has occurred
And when the initial alarm condition is detected, calculating an initial alarm value by summing intensity of light signals corresponding to a set number of times greater than or equal to a first set value. 4. The method according to any one of claims 1 to 3,
Detecting the final alarm condition
Detecting a signal group consisting of optical signals having a set pattern from optical signals output from the optical fiber sensor network;
Calculating a signal group value for the detected signal group;
Calculating a determination value for determining a final alarm state based on the calculated signal group value; And
Detecting the final alarm state by comparing the calculated determination value with a preset final alarm value;
Including, intrusion detection method. The method of claim 4
Detecting the signal group
Setting the detected optical signals as one signal group when the intensity of the detected optical signal is equal to or greater than a second preset value and the optical signals greater than or equal to the second preset value are detected within a preset first interval; Including, intrusion detection method. The method of claim 4
Computing the signal group value
Select one of the first calculation method and the second calculation method according to which signal group the detected signal group corresponds to and which generation period, which is an interval with a previously detected signal group, exceeds a preset interval. Making; And
Calculating a signal group value according to the selected calculation method
Including, intrusion detection method. The method of claim 6, wherein
The first calculation method and the second calculation method,
The signal group value is determined based on the maximum signal group maximum value among the intensity of the optical signals included in the signal group, and the signal group holding time corresponding to the time when the first optical signal included in the signal group is detected until the last optical signal is detected. Yields,
And the first calculating method calculates a signal group value by additionally considering the number of signal groups corresponding to the number of detected signal groups. The method of claim 7, wherein
And the first calculation method and the second calculation method calculate the signal group value by further considering a weight having a different value depending on an environment in which the optical fiber sensor network is installed. The method of claim 8, wherein
The weight is
A first weight based on the intensity of the optical signal generated by the installed environment and further calculated for the signal group maximum, and
And a second weight value based on the time at which optical signals that may be determined to have occurred by the installed environment may be generated, and further calculated with respect to the signal group holding time. The method of claim 8, wherein
Computing the signal group value
And changing the weight if the initial alert condition is detected. The method of claim 4
The calculating of the determination value
Acquiring an initial alarm value corresponding to the initial alarm state; And
Calculating an evaluation value by accumulating the acquired initial alarm value and signal group values of the detected signal groups
Including, intrusion detection method. The method of claim 11, wherein
Computing the signal group value to calculate the evaluation value,
And calculating the evaluation value by further considering an initialization value for initializing the evaluation value when the signal groups are not detected. In the intrusion detection device to detect the intrusion by using the optical fiber sensor network installed in the guard zone,
The optical fiber sensor network is formed of a plurality of optical fibers are woven in the form of a plurality of gratings, the fixing cover for maintaining the grating form in each of the grating is connected to each other in the form of a built-in optical fiber,
A light source for supplying an optical signal to the optical fiber sensor network;
An optical detector detecting the optical signals output from the optical fiber sensor network and outputting a corresponding signal; And
A discriminating unit detecting an initial warning state for removing a fixed cover installed in the optical fiber sensor network for intrusion and a final warning state for intrusion based on a signal pattern of optical signals output from the light detecting unit
Including,
The determination unit, when the signal pattern for the optical signals output from the light detection unit indicates a signal change according to the change in the pressure applied to the optical fiber by the fixing cover installed in the optical fiber sensor network, the initial removal of the fixing cover An intrusion detection device that determines that an alarm condition has occurred. The method of claim 13, wherein
The determining unit
A first determination unit determining that the detected optical signal is equal to or greater than a first preset value and an initial alarm state is detected when an optical signal equal to or greater than a first preset value is detected more than a preset number of times; And
A second determination unit which detects a signal group consisting of optical signals having a set pattern from the optical signals output from the optical fiber sensor network, and determines a final alarm state based on the detected signal groups
Including, intrusion detection device. The method of claim 14, wherein
The second determination unit,
A signal group detection module detecting a signal group consisting of optical signals having the set pattern;
A signal group value calculation module for calculating a signal group value for the detected signal group;
A determination value calculating module step of calculating a determination value for determining a final alarm state based on the calculated signal group value; And
Determination module for detecting a final alarm state by comparing the calculated determination value and a predetermined final alarm value
Including, intrusion detection device. The method of claim 15, wherein
The signal group value calculation module,
Select one of the first calculation method and the second calculation method according to which signal group the detected signal group corresponds to and which generation period, which is an interval with a previously detected signal group, exceeds a preset interval. And calculating the signal group value. The method of claim 16, wherein
The first calculation method and the second calculation method,
The signal group value is determined based on the maximum signal group maximum value among the intensity of the optical signals included in the signal group, and the signal group holding time corresponding to the time when the first optical signal included in the signal group is detected until the last optical signal is detected. Yields,
And the first calculation method calculates a signal group value in consideration of the number of signal group numbers corresponding to the number of detected signal groups. The method of claim 13, wherein
The fixing cover
A guide part on which an optical fiber is disposed;
Protrusions comprising a plurality of protrusions are formed respectively along the guide portion
Including;
The optical signal output through the optical fiber is changed according to the contact and separation state of the optical fiber disposed in the guide portion and the projection of the projection portion, intrusion detection apparatus. A plurality of optical fibers crossing each other to form a plurality of lattice shapes; And
A plurality of fixing covers each formed at a position forming the lattice form and maintaining the lattice form by embedding an optical fiber at a corresponding position;
Including;
The fixing cover
A first guide part on which one optical fiber is disposed;
Another optical fiber is disposed, the second guide portion is formed to cross the first guide portion and the first point and the first point;
A first protrusion including a plurality of protrusions respectively formed along the first guide portion;
A second protrusion including a plurality of protrusions respectively formed along the second guide portion;
Including,
The optical signal output through the optical fiber is changed according to the contact and separation state of the optical fiber disposed in the first guide portion and the projection of the first protrusion,
The optical signal output through the optical fiber is changed according to the contact and separation state of the optical fiber disposed in the second guide portion and the projection of the second projection.

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