KR100717646B1 - Indoor monitoring system using FTTH system - Google Patents

Abstract

The present invention relates to an indoor monitoring system using an FTTH system that makes it easy to detect an invasion of an intruder in a house by using a light signal provided to the house in an FTTH system provided with an optical signal to a house. .

The indoor monitoring system using the FTTH system according to the present invention is an FTTH system in which an optical fiber termination device coupled to a predetermined service providing network is combined with a plurality of indoor devices through an optical distribution network, wherein the indoor device is configured from an optical distribution network. And a splitter that separates the applied optical signal at a predetermined ratio and provides the optical subscriber network device coupled to the subscriber terminal and the monitoring device, respectively, and the monitoring device includes a predetermined length of optical fiber and a reflector coupled to an end of the optical fiber. And a control means for determining whether an intrusion is made based on a change in the signal level of the reflected light applied from the sensor part.

Description

Indoor monitoring system using FTTH system

1 is a system configuration diagram showing a schematic configuration of an indoor monitoring system using the FTTH system according to the present invention.

Figure 2 is a block diagram showing the internal configuration of the indoor device 400 shown in FIG.

3 to 6 are block diagrams showing functional separation of the internal configuration of the monitoring device 430 shown in FIG.

7 is a view illustrating an installation form of the sensor unit 431 shown in FIG.

******* Brief description of the main parts of the drawing *******

100: service providing network, 200: optical fiber termination device,

300: optical distribution network, 400: home equipment,

410: splitter, 420: optical subscriber network device,

430: monitoring device, 431: sensor unit,

432: optical connection, 433: photodiode,

434: coupler, 435: reference level information storage,

436: information input unit, 437: alarm providing unit,

438: control unit, OC: optical cable.

The present invention relates to an indoor monitoring system using an FTTH system that can easily detect whether an intruder enters a house with a low cost and simple configuration by using an optical signal provided to the house in an FTTH system provided with an optical signal to a house.

An intrusion monitoring device is installed in a general home or building for the purpose of protecting a facility from intruders.

The intrusion detection market is generally configured to emit an infrared sensor to a specific position and to detect an external intruder or an intruder contacting it.

However, the infrared sensor has a disadvantage in that the detection range is very limited because the infrared ray's emission distance is limited. In addition, the infrared sensor has a problem that the installation cost is burdened because the equipment is complicated.

In recent years, an intrusion monitoring apparatus using an optical fiber has been proposed.

The intrusion detection device using the optical fiber basically comprises a light source for supplying a predetermined optical signal, an optical fiber for transmitting an optical signal applied from the light source, and a detection unit for analyzing the optical signal applied from the optical fiber to determine whether the intrusion is detected. do. Here, the optical fiber is generally composed of an optical fiber grating. The optical fiber grating is configured to form a grating on an optical fiber core so that the optical wavelength reflected by the grating spacing is changed. That is, the presence or absence of external invasion is detected by analyzing the wavelength change of the reflected light as the lattice spacing of the optical fiber is changed by the external impact.

However, the optical fiber lattice has a disadvantage in that the manufacturing process is very difficult and the inconvenience of mounting the grating is formed at the correct position and the price is also expensive. In addition, since the cost of the light source element and the cost of the data processing system are high, there is a problem in that the installation cost of the intrusion monitoring apparatus is high.

On the other hand, FTTH (Fiber To The Home) system has recently been proposed to provide various information including broadcasting and communication by connecting an optical cable to a home.

Accordingly, the present invention was created in view of the above circumstances, and can easily detect whether an intruder enters the house with a simple and low-cost configuration using the optical signal provided to the house in the FTTH system in which the optical signal is provided to the house. Its technical purpose is to provide an indoor monitoring system using FTTH system.

In the indoor monitoring system using the FTTH system according to the present invention for achieving the above object in the FTTH system is configured such that the optical fiber termination device coupled to a predetermined service providing network is coupled to a plurality of indoor devices through the optical distribution network, The apparatus comprises a splitter for separating the optical signal applied from the optical distribution network at a predetermined rate and providing the optical subscriber network device coupled to the subscriber terminal and the monitoring device, respectively, the monitoring device having a predetermined length of optical fiber and the optical fiber thereof. The sensor unit is coupled to the end of the sensor, characterized in that it comprises a control means for determining whether the intrusion based on the change in the signal level of the reflected light applied from the sensor.

In addition, in the monitoring device, the sensor unit is configured such that the first and second optical fibers of a predetermined length are arranged in parallel, and a reflector is coupled to the ends of the first and second optical fibers, and converts and outputs an optical signal to an electrical signal. A photodiode and an optical signal applied from the splitter are separated and provided to the first and second optical fibers, and coupling means for synthesizing the reflected light applied from the first and second optical fibers and providing the photodiode to the photodiode And the control means sets the signal level of the reflected light initially applied from the photodiode to a reference level, and if it is determined that the difference between the signal level of the reflected light applied from the photodiode and the reference level is a predetermined level or more. Characterized in that the control to perform the alarm processing.

That is, according to the above, it is possible not only to use the low cost optical fiber as the light sensor but also to provide the home surveillance service at low cost, and to use the optical signal flowing into the home as a light source for intrusion detection, It is possible to provide more stable indoor monitoring service by automatically resetting every detection operation.

Next, an embodiment according to the present invention will be described.

Figure 1 schematically shows the configuration of the indoor monitoring system using the FTTH system according to the present invention.

As shown in FIG. 1, in an indoor monitoring system using an FTTH system, an optical line terminal (OLT: 200) coupled to a predetermined service providing network (100) has a passive optical distribution network (ODN: 300). ) Is configured through a plurality of indoor devices (400: 400 ₁ ~ 400 _N ) and through the optical cable (OC).

Here, the service providing network 100 may be composed of a broadcasting service network 110 for providing CATV or satellite broadcasting service and a data service network 120 for providing high speed Ethernet service.

In addition, the optical fiber terminal 200 converts a broadcast signal applied from the broadcast service network 110 into an optical signal having a first wavelength and outputs the optical signal to the optical distribution network 300, and includes an optical transmitter and an optical receiver to provide data. It is configured to perform data communication between the service network 120 and the optical distribution network (300). In this case, the optical fiber terminal 200 combines the broadcast signal of the first wavelength and the optical signal for data provided from the data service network 200 and provides the optical signal to the optical distribution network 300.

In addition, the optical distribution network 300 serves as an optical transmission medium between the optical fiber terminal 200 and the indoor device 400, and may be configured in various forms according to the structure of the network. At this time, the end of the optical cable (OC) is coupled to the indoor device 400 is introduced into the home through the OUTLET (W) as shown in FIG.

In addition, the indoor device 400 is a splitter 410 is coupled through the optical distribution network 300 and the optical cable (OC), as shown in Figure 2 and is coupled through the splitter 410 and the optical cable (OC) and In addition, the other end is combined with a subscriber terminal, such as HDTV or computer, converts the optical signal applied from the splitter 410 into an electrical signal and then provides it to the subscriber terminal or converts the electrical signal provided from the subscriber terminal into an optical signal. After the optical subscriber terminal device 420 provided to the splitter 410 and the splitter 410 and the optical cable (OC) is coupled through the optical signal applied from the splitter 410 for monitoring the intruder in the home It is configured with a monitoring device 430. At this time, the splitter 410 and the optical subscriber terminal 420, the splitter 410 and the monitoring device 430 is configured to be selectively connected through, for example, an optical connector.

The splitter 410 separates an optical signal applied from the optical distribution network 300 by a predetermined ratio, for example, 99: 1, and provides an optical signal corresponding to “99” to the optical subscriber network device 420. The optical signal corresponding to "1" is provided to the monitoring device 430.

In addition, the optical subscriber terminal device 420 separates the optical signal applied from the splitter 410 to provide a multimedia service such as HDTV, to enable data communication through a terminal such as a computer, and various subscribers to enable voice communication. It is configured to be coupled to the terminal to provide the data applied from each subscriber terminal to the splitter 410.

In addition, the monitoring device 430 is the first and second optical fibers (431 _a1 , 431 _a2 ) of a predetermined length, as shown in FIG. 431 _a1 and 431 _a2 , a sensor unit 431 formed by coupling predetermined reflectors 431 _b1 and 431 _b2 reflecting the input light, an optical connecting unit 432 for coupling with the splitter 410, A photodiode 433 for converting an input optical signal into an electrical signal and outputting the same, and providing an optical signal applied from the optical connecting unit 432 to the sensor unit 431, and reflecting from the sensor unit 431. Coupler 434 for providing the reflected light to the photodiode 433, the reference level information storage unit 435 for storing reference signal level information for determining intrusion detection, the function setting of the monitoring device 430, For example, the information input unit 436 for setting the operation start and end, and provide alarm information It is configured to include a control unit 438 for controlling the overall operation of the alarm generation section 437, and, the monitoring apparatus 430 for group. Here, an optical amplifier 471 such as an optical amplifier or an optical repeater is coupled between the coupler 434 and the sensor unit 431 to amplify a predetermined level of light applied from the coupler 434. It can be configured to provide to the sensor unit 431. Further, as shown in FIG. 5, between the coupler 434 and the sensor unit 431, a signal restorer 481 such as a signal generator or a signal restorer is coupled to restore the shape of the amplified light and then the sensor unit ( 431 may be provided. In addition, the optical amplifier 471 and the signal restorer 481 may be sequentially formed between the coupler 434 and the sensor 431 as shown in FIG. 6.

The first and second optical fibers 431 _a1 and 431 _{a2 of} the sensor unit 431 are general glass optical fiber or plastic optical fiber, and the outer side of the optical fiber is PVC coated. The lengths of the first and second optical fibers 431 _a1 and 431 _a2 are set to approximately 500 m or less. At this time, the optical fiber 431a has a characteristic in which the phase of the optical signal traveling through the optical fiber is changed due to an external impact, for example, vibration or physical force around the optical fiber. Therefore, when the intruder enters the home, a phase difference is generated in the optical signal of the optical fiber 431a by the vibration or physical force generated by the intruder, and thus is applied to the photodiode 433 through the coupler 434. The signal level of the reflected light is changed. For example, the sensor unit 431 is installed on the lower side of the footrest (X) placed in front of the front door as shown in Figure 7 (Fig. 7a), or installed along the border of the window (Y) (Fig. 7b), the wall surface It may be implemented in various forms, such as installed on the inner side Z (FIG. 7C), or installed along the edge of the home wall Z (FIG. 7D).

The coupler 434 separates an optical signal applied from the splitter 410 through a connecting portion 432 at a ratio of 50:50 and provides the first and second optical fibers 431 _a1 and 431 _a2 , respectively, And synthesized first and second reflected light applied from the second optical fibers 431 _a1 and 431 _a2 to the photodiode 433.

The photodiode 433 repeatedly converts the reflected light applied from the coupler 434 into an electrical signal based on the control signal applied from the controller 439 and provides the converted signal to the controller 438 at predetermined periodic intervals. Done.

The control unit 438 uses the signal level of the reflected light applied from the photodiode 433 as a reference signal level based on the predetermined operation start information from the information input unit 436 as the reference level information storage unit 435. Store in The controller 438 compares the signal level of the reflected light applied from the photodiode 433 and the reference signal level after the reference level is set, and when the difference between the signal levels becomes a predetermined level or more, alarm information through the alarm generator 437. Will be provided. The controller 438 clears the reference level information storage unit 435 based on the predetermined operation termination information from the information input unit 436. That is, the control unit 438 resets the reference level of the sensor unit 431 at each start of the monitoring operation. This takes into account that phase change occurs on the first and second optical fibers 431 _a1 and 431 _a2 in a steady state over time or due to intrusion by an intruder.

On the other hand, the alarm generating unit 437 is a light emitting display unit 437a for performing the light emission display processing, a buzzer 437b for transmitting an alarm sound, and for example in the form of RS232C for data communication with an external device such as a computer. It is configured to include at least one of the communication connection unit 437c is configured. That is, when it is determined that the intrusion detection, the control unit 438 displays the light emission through the light emitting display unit 437a or sends an alarm sound through the buzzer 437 or a predetermined intrusion alarm message through the communication connection unit 437c. Control to send to external device. In this case, the external device may be a computer or the like, and may perform alarm processing such as providing a corresponding intrusion alarm message to a security company through the computer.

In addition, the information input unit 436 may be installed outside the home so that the user can set whether the operation after leaving the front door. This is to prevent a malfunction that determines the user as an intruder by vibrating due to the user's movement when setting the operation function of the monitoring device 430 in the home.

Next, the operation of the device having the above configuration will be described.

First, the optical fiber terminal 200 coupled with the service providing network 100 is combined with the optical distribution network 300 through the optical cable OC, and the optical distribution network 300 is connected to the indoor device through the optical cable OC. In the combined state 400, the indoor device 400 separates an optical signal applied through the optical distribution network 300 at a predetermined ratio through the splitter 410, and thus the optical subscriber device 420 and the monitoring device 430. To each.

Here, the optical subscriber device 420 provides broadcast information, such as CATV or satellite broadcasting, provided to the service providing network 100 through a broadcast medium, and the optical subscriber device 420 for information such as data or voice. It is to provide a service to perform a two-way communication with the data terminal and the service providing network 100, such as a computer combined with.

On the other hand, the operation of the monitoring device 430 is as follows.

First, the user installs the first and second optical fibers 431 _a1 and 431 _a2 in a predetermined position for detecting an intruder's intrusion, for example, as shown in FIG. 4. In this case, the first and second optical fibers 431 _a1 and 431 _a2 may provide the reflected light reflected through the first and second reflectors 431 _b1 and 431 _b2 to the photodiode 433 through the coupler 434. do.

In the above state, when the user exits the front door and locks the door and inputs an operation start function key through the information input unit 436 installed outside the front door, predetermined operation start information is applied to the control unit 438.

The controller 438 sets the photodiode 433 and the alarm generator 437 to an operation state based on the operation start information applied from the information input unit 436. In this case, the photodiode 433 converts the reflected light applied from the coupler 434 into an electrical signal and provides the converted signal to the controller 438.

The control unit 438 stores the signal level of the reflected light initially applied from the photodiode 433 in the reference level information storage unit 435 as reference signal level information. Here, the control unit 438 may be configured to transmit a predetermined error message through the alarm generating unit 437 when the signal level set as the reference signal level becomes above the predetermined level or below the predetermined level. In the state where the reference signal level is normally set, the controller 438 compares the signal level of the reflected light periodically applied from the photodiode 433 and the reference signal level to determine whether the difference is a predetermined level or more.

At this time, when the intruder enters the home, the phase is changed to the light traveling through the first or second optical fibers 431 _a1 and 431 _a2 of the sensor unit 431, and the first and second reflected light of the changed phase are couplers. Synthesized via 434 and applied to photodiode 433. The photodiode 433 provides the control unit 438 with the signal level of the reflected light. The controller 438 outputs predetermined alarm information through the alarm generator 437 when the difference between the signal level of the reflected light applied from the photodiode 433 and the reference signal level is greater than or equal to a predetermined level.

That is, according to the above embodiment, an indoor monitoring system using an FTTH network that provides an indoor monitoring service at low cost by using an optical signal provided to the home as a light source for intrusion detection and using a low cost optical fiber as an optical sensor. It can be provided.

In addition, it is possible to provide a more stable indoor monitoring service by automatically resetting the reference level for determining whether the intrusion, each time the detection start.

In addition, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the technical spirit of the present invention.

As described above, according to the present invention, a low-cost optical fiber can be provided as an optical sensor and an indoor surveillance service can be provided at a low cost as well as using an optical signal flowing into the home as a light source for intrusion detection, and criteria for determining invasion The level is automatically reset at each monitoring operation to provide a more stable indoor monitoring service.

Claims (5)

In the FTTH system is configured such that the optical fiber termination device coupled to the service providing network is coupled to a plurality of indoor devices through the optical distribution network, The indoor device is configured to include a splitter for separating the optical signal applied from the optical distribution network at a certain ratio to provide an optical subscriber network device and a monitoring device coupled to the subscriber terminal, respectively, The monitoring device is configured to include a sensor having a predetermined length of the optical fiber and a reflector coupled to the end of the optical fiber, and the control means for determining whether the intrusion based on the change in the signal level of the reflected light applied from the sensor unit. Home surveillance system using FTTH system. The method of claim 1, In the monitoring device, the sensor unit is configured such that a reflector is coupled to the ends of the first and second optical fibers while the first and second optical fibers of a predetermined length are arranged in parallel, The photodiode converts and outputs an optical signal into an electrical signal, and separates the optical signal applied from the splitter and provides the optical signal to the first and second optical fibers, and combines the reflected light applied from the first and second optical fibers. Further provided with a coupling means provided to the photodiode, The control means sets the signal level of the reflected light initially applied from the photodiode to a reference level and performs alarm processing when it is determined that the difference between the signal level of the reflected light applied from the photodiode and the reference level is higher than a predetermined level. Indoor monitoring system using the FTTH system, characterized in that the control. The method of claim 2, The first and second optical fibers of the sensor unit is a home monitoring system using the FTTH system, characterized in that the PVC-coated general optical fiber. The method of claim 2, The monitoring device is configured to further include information input means for turning on / off the operation of the monitoring device, And the control means resets the signal level of the reflected light initially received from the photodiode to the reference signal level after receiving the operation start information when the operation start information is applied from the information input means. The method of claim 2, The monitoring device includes at least one alarm generating means of a light emitting display for performing light emission display, a buzzer for transmitting an alarm sound, and a communication connection unit for performing data communication with an external device. The control means for the indoor monitoring system using the FTTH system, characterized in that to control the alarm processing through the alarm output means when the intrusion detection.

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