WO2007043794A1 - Apparatus and method for detecting intrusion by using fiber bragg grating sensor - Google Patents
Apparatus and method for detecting intrusion by using fiber bragg grating sensor Download PDFInfo
- Publication number
- WO2007043794A1 WO2007043794A1 PCT/KR2006/004074 KR2006004074W WO2007043794A1 WO 2007043794 A1 WO2007043794 A1 WO 2007043794A1 KR 2006004074 W KR2006004074 W KR 2006004074W WO 2007043794 A1 WO2007043794 A1 WO 2007043794A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- intrusion
- optical fiber
- fbg
- sensors
- measurement system
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000000835 fiber Substances 0.000 title claims abstract description 19
- 239000013307 optical fiber Substances 0.000 claims abstract description 71
- 238000001514 detection method Methods 0.000 claims abstract description 58
- 238000005259 measurement Methods 0.000 claims abstract description 55
- 230000003287 optical effect Effects 0.000 claims abstract description 28
- 238000002310 reflectometry Methods 0.000 claims description 17
- 238000005452 bending Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 5
- 238000009434 installation Methods 0.000 description 5
- 230000007257 malfunction Effects 0.000 description 3
- 238000007689 inspection Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 241001465754 Metazoa Species 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/02—Mechanical actuation
- G08B13/12—Mechanical actuation by the breaking or disturbance of stretched cords or wires
- G08B13/122—Mechanical actuation by the breaking or disturbance of stretched cords or wires for a perimeter fence
- G08B13/124—Mechanical actuation by the breaking or disturbance of stretched cords or wires for a perimeter fence with the breaking or disturbance being optically detected, e.g. optical fibers in the perimeter fence
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/18—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
- G08B13/181—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using active radiation detection systems
- G08B13/183—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using active radiation detection systems by interruption of a radiation beam or barrier
- G08B13/186—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using active radiation detection systems by interruption of a radiation beam or barrier using light guides, e.g. optical fibres
Definitions
- the present invention relates to an apparatus and a method for detecting intrusion by using a fiber Bragg grating (FBG) sensor. More particularly, the present intentional relates to an apparatus and a method for detecting intrusion by using a fiber Bragg grating (FBG) sensor, in which the FBG sensor or an FBG strain sensor, and an FBG vibration sensor are attached to a fence, such as wire-entanglements, so as to detect intrusion based on physical pressure applied to the fence and a cut-off state of an optical transmission line.
- FBG fiber Bragg grating
- an intrinsic wavelength of a fiber Bragg grating (FBG) sensor is changed according to physical pressure applied to the FBG sensor. If an optical transmission path is shortened, an intensity of a reflective wavelength of the FBG sensor is reduced. Accordingly, it is possible to precisely detect intruders and the intrusion position based on physical pressure applied to a fence and a cut-off state of an optical transmission line by detecting wavelength variation and light-quantity variation of FBG sensors attached to the fence.
- FBG fiber Bragg grating
- an optical time domain reflectometer (OTDR) scheme is used to detect intruders and the intrusion position.
- OTDR scheme light irradiated from an OTDR passes through optical fibers attached to a fence, and the light is scattered if there is micro-bending or cut-off of the optical fibers. In this case, the light is reflected toward the OTDR.
- the OTDR scheme detects intruders and the intrusion position by measuring arriving time of the light to the OTDR. At this time, the OTDR performs computation proportionally to the length of the optical fibers attached to the fence and analyzes the state of the optical fibers.
- the optical fibers attached to the fence having the length of 200mm due to the great amount of data.
- the optical fibers must be arranged over the whole area of the fence in the form of a net in order to detect intruders and the intrusion position.
- the optical fibers must cross each other while being fixed by means of a rigid member.
- the rigid member is provided in addition to the optical fibers, the weight and volume of an intrusion protection system may increase, so that the intrusion protection system frequently malfunctions when it is influenced by rain, wind and snow, and erroneously raises an alarm due to tare thereof or when it is affected by animals.
- the ODTR system is very complicated and expensive, and does not employ an optical distributor, such as an optical coupler, due to the unique measurement scheme thereof, so the ODTR system must detect the fence having the length of 200m by using one strand of optical fiber. Thus, if cut-off of the optical fiber occurs at a location remote from the front part of the fence by 20m, the ODTR system cannot detect intruders who break through the remaining part (180m) of the fence.
- the present invention has been made to solve the above problem occurring in the prior art, and an object of the present invention is to provide an apparatus and a method for detecting intrusion by using a fiber Bragg grating (FBG) sensor, which can reduce a system establishment cost while forming an intrusion detection area with respect to a plurality of independent fences.
- FBG fiber Bragg grating
- Another object of the present invention is to provide an apparatus and a method for detecting intrusion by using a fiber Bragg grating (FBG) sensor, which can reduce an influence derived from cut-off of optical fibers, and can prevent malfunction of an intrusion protection system caused by rain or wind by minimizing the size and lightening the weight of optical fibers.
- FBG fiber Bragg grating
- Still another object of the present invention is to provide an apparatus and a method for detecting intrusion by using a fiber Bragg grating (FBG) sensor, which can enlarge an intrusion detection area by about 10 times or more using an optical switch.
- FBG fiber Bragg grating
- Still yet another object of the present invention is to provide an apparatus and a method for detecting intrusion by using a fiber Bragg grating (FBG) sensor, which can facilitate installation and repair and maintenance work for an intrusion detection system.
- FBG fiber Bragg grating
- an apparatus for detecting intrusion comprising: a measurement system; an optical fiber for transmitting and detecting optical signals; and a plurality of fiber Bragg grating (FBG) sensors installed in intrusion detection areas together with the optical fiber and representing reflective wavelengths different from each other.
- FBG fiber Bragg grating
- a method for detection intrusion by using fiber Bragg grating (FBG) sensors comprising the steps of: installing an optical fiber and the FBG sensors in predetermined intrusion areas; continuously measuring wavelength variation or wavelength intensity of the optical fiber by using a measurement system; and comparing the measured wavelength variation or measured wavelength intensity of the optical fiber with a reference value, thereby determining intrusion of an intruder.
- FBG fiber Bragg grating
- a method for detection intrusion by using fiber Bragg grating (FBG) sensors comprising the steps of: installing an optical fiber and the FBG sensors in predetermined intrusion areas; continuously measuring a number of the FBG sensors by using a measurement system; and comparing the measured number of the FBG sensors with a reference value, thereby determining intrusion of an intruder.
- FBG fiber Bragg grating
- the intrusion protection system may not malfunction even if the intrusion protection system is subject to the severe natural phenomenon such as rain, wind and snow.
- the measurement system measures the intrinsic reflective wavelength of the FBG sensors, the measurement speed is improved.
- the present invention makes use of the optical switch, the system establishment cost can be reduced and the intrusion detection area can be enlarged by 10 times as compared with the conventional intrusion detection area.
- the present invention makes use of the optical distributor, so that a plurality of independent intrusion detection areas can be formed and influence derived from the cut-off of the optical fibers can be minimized.
- the present invention can detect the wavelength variation, wavelength intensity and disconnection of optical fibers by using the FBG sensors, so the present invention can precisely and reliably detect intrusion of the intruder together with various application tools.
- the present invention can provide an intrusion detection system having a light weight and can facilitate installation and repair and maintenance work for the intrusion detection system.
- the intrusion detection system according to the present invention has superior functional flexibility, so that the intrusion detection system employing the FBG sensors can be used in various fields, such as the intrusion inspection, safety analysis for a structure, fire detection, temperature detection, water level detection, and pressure detection.
- FlG. 1 is a view illustrating an intrusion detection apparatus using a fiber Bragg grating (FBG) sensor according to the present invention
- FIG. 2 is a view illustrating wavelengths of fiber Bragg grating (FBG) sensors transmitted to a measurement system when the FBG sensors have the same reflective characteristics;
- FBG fiber Bragg grating
- FIG. 3 is a view illustrating wavelengths of fiber Bragg grating (FBG) sensors transmitted to a measurement system when the FBG sensors having low reflectivity are installed adjacent to the measurement system and the FBG sensors having high reflectivity are installed remote from the measurement system; and
- FBG fiber Bragg grating
- FIG. 4 is a view illustrating an installation method for optical fibers according to the present invention.
- the intrusion detection apparatus using FBG sensor mainly includes a measurement system 10, optical fibers 50 connected to the measurement system 10 so as to transmit and detect optical signals, and FBG sensors Sl to S 14 installed in the intrusion detection area together with the optical fibers and having reflective wavelengths different from each other.
- an optical distributor 30 is provided between the measurement system
- the wavelength variation and the wavelength intensity of the intrusion detection area can be detected by dividing the intrusion detection area into at least two intrusion detection areas by using the optical distributor 30.
- an optical switch 20 is provided between the measurement system 10 and the FBG sensors so as to form at least one independent intrusion detection channel. That is, it is possible to use FBG sensors having reflective wavelengths equal to those of other channels, or to form an independent intrusion detection area. In other words, it is possible to select an intrusion detection area from among plural intrusion detection areas by using the optical switch 20.
- the FBG sensors Sl to S14 having reflective wavelengths different from each other are installed on at least one intrusion detection area of a fence.
- the FBG sensors Sl to S 14 are installed on columns of the fence. Since physical pressure is applied to the columns of the fence when the intruder makes contact with the fence, the FBG sensors can precisely detect the physical pressure when they area installed on the columns of the fence.
- the FBG sensors are connected to each other through single mode optical fibers 50.
- the FBG sensors are installed on the fence while being connected to each other by means of the optical fibers in the form of a zigzag pattern.
- an interval between the optical fibers is preferably set within 15cm such that the intruder does not pass through the fence without cutting off the optical fibers.
- the optical fibers are integrally fixed with the fence by means of coupling members aligned at a predetermined interval. In this case, when the intruder breaks through the fence, such as wire-entanglements, the optical fibers are cut off, so that the intrusion position can be detected.
- optical fiber fabricated in the form of a net can be used in order to detect intrusion.
- the optical distributor 30, such as the optical coupler, is installed at a front portion of the FBG sensors so as to provide at least one intrusion detection area.
- the optical distributor 30 divides the intrusion detection area into several areas so as to reduce the non-detection area when the optical fibers are cut off. Even if the intrusion detection area is divided into several areas, the FBG sensors must have reflective characteristics different from each other.
- the optical switch 20 can be installed between the measurement system 10 and the optical distributor 30 in order to provide at least one independent intrusion detection area. At this time, the number of output terminals of the optical switch 20 corresponds to the number of the independent intrusion detection areas. In this case, the FBG sensors having the same reflective characteristics can be installed in the independent intrusion detection areas, respectively, so that the system establishment cost can be reduced.
- the FBG sensors having low reflectivity are installed adjacent to the measurement system, and the FBG sensors having high reflectivity are installed remote from the measurement system.
- the first FBG sensor Sl preferably has reflectivity of 50%
- the second FBG sensor S2 preferably has reflectivity of 60%
- the third FBG sensor S3 preferably has reflectivity of 70%
- the fourth FBG sensor S4 preferably has reflectivity of 80%
- the fifth FBG sensor S5 preferably has reflectivity of 90%.
- the wavelengths of the light reflected toward the measurement system have the same intensity so that the measurement system can measure the wavelength variation.
- FIG. 2 is a view illustrating wavelengths of the FBG sensors transmitted to the measurement system when the FBG sensors have the same reflective characteristics
- FIG. 3 is a view illustrating wavelengths of the FBG sensors transmitted to the measurement system when the FBG sensors having low reflectivity are installed adjacent to the measurement system and the FBG sensors having high reflectivity are installed remote from the measurement system.
- the FBG sensors having low reflectivity are preferably installed adjacent to the measurement system 10, and the FBG sensors having high reflectivity are preferably installed remote from the measurement system 10.
- the light reflected from the FBG sensors toward the measurement system 10 represents the same wavelength variation and wavelength intensity.
- a space formed between the FBG sensors may serve as an intrusion detection area.
- the space has a length of about 5m.
- the present invention does not limit the length of the space.
- the position of the sensors may be changed depending on the type of the sensors.
- FBG sensors used for detecting the intrusion position can be attached to various positions in the fence.
- vibration sensors employing the FBG sensors to detect the intrusion position and vibration of the fence can be installed on upper portions of columns of the fence which represent great vibration variation.
- strain sensors employing the FBG sensors are preferably installed at lower portions of columns of the fence because the lower portions of the column represent great deformation when pressure is applied to the fence.
- the method for detecting intrusion will be described.
- the wavelength of the FBG sensors installed in the intrusion detection areas is changed due to the weight of the intruder.
- the changed wavelength of the FBG sensors is transmitted to the measurement system so that the intrusion protection system generates an alarm.
- intrinsic reflective wavelengths of the FBG sensors installed rearward of the cut-off area are not transmitted to the measurement system.
- the cut-off area can be detected by using the above feature.
- the measurement system may detect the intrinsic reflective wavelengths of the first to third FBG sensors Sl to S3, but the intrinsic reflective wavelengths of the fourth and fifth FBG sensors S4 and S5 installed rearward of the cut-off area are not detected.
- intrusion occurs between the third FBG sensor S3 and the fourth FBG sensor S4.
- Another method is to detect micro-bending of optical fibers when the intruder makes contact with the optical fibers, attachments or underground equipment buried below the fence.
- the FBG sensors installed rearward of the micro-bending area represent reflective wavelengths having intensity reduced proportional to the degree of micro-bending. If the intensity of the reflective wavelength is reduced beyond a predetermined range, the intrusion protection system raises an alarm.
- the measurement system employing the FBG sensors can be cooperated with various sensors representing the reflective wavelength characteristics of the FBG sensors, so that the intrusion inspection, safety analysis for a structure, fire detection, water level detection, ground pressure detection and the variation detection can be achieved by using only one system and one optical fiber.
- Optical fibers and FBG sensors are installed in predetermined intrusion areas.
- the measurement system continuously measures the wavelength variation and wavelength intensity of optical fibers, and the number of the FBG sensors.
- the measurement system detects the changed wavelength variation and the wavelength intensity of the optical fibers.
- the measurement system detects intrusion of the intruder based on the number of the FBG sensors that send wavelength signals to the measurement system.
- FIG. 4 is a view illustrating an installation method for optical fibers according to the present invention.
- the optical fiber 50 is installed together with a circular-shaped path 120 so as to precisely and easily detect intrusion of the intruder.
- a cylindrical link 130 is provided adjacent to the circular-shaped path 120 so as to receive the optical fiber 50 therein.
- the optical fiber 50 is inserted into the cylindrical link 130.
- the cylindrical link 130 keeps roundness of the optical fiber 50.
- the diameter of the circular-shaped path 120 is 25mm or less, loss of light intensity may greatly increase due to the characteristics of the optical fiber 50. Accordingly, if the intruder touches the optical fiber 50, the diameter of the circular- shaped path 120 is reduced, so that the loss of light intensity may greatly increase. Thus, the attenuation rate is also increased so that the measurement system can easily detect intrusion of the intruder even if the optical fiber 50 is slightly deformed.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Burglar Alarm Systems (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/083,134 US20090269001A1 (en) | 2005-10-10 | 2006-10-10 | Apparatus and Method for Detecting Intrusion by Using Fiber Bragg Grating Sensor |
JP2008535445A JP2009512057A (en) | 2005-10-10 | 2006-10-10 | Intruder sensing apparatus and method using optical fiber grating sensor |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR20050094696 | 2005-10-10 | ||
KR10-2005-0094696 | 2005-10-10 | ||
KR10-2006-0087910 | 2006-09-12 | ||
KR1020060087910A KR20070108319A (en) | 2005-10-10 | 2006-09-12 | Method of guard system fbg |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2007043794A1 true WO2007043794A1 (en) | 2007-04-19 |
Family
ID=37942991
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/KR2006/004074 WO2007043794A1 (en) | 2005-10-10 | 2006-10-10 | Apparatus and method for detecting intrusion by using fiber bragg grating sensor |
Country Status (1)
Country | Link |
---|---|
WO (1) | WO2007043794A1 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102646308A (en) * | 2012-04-20 | 2012-08-22 | 北京交通大学 | Perimeter security system based on single optical fiber and fiber bragg grating of single optical fiber |
US8436732B2 (en) | 2009-06-03 | 2013-05-07 | Jason Bentley Lamont | Fiber bragg grating perimeter security system |
CN105225381A (en) * | 2015-10-14 | 2016-01-06 | 国家电网公司 | A kind of intruding detection system based on optical fiber fence |
CN109059794A (en) * | 2018-09-03 | 2018-12-21 | 刘绍波 | A kind of FBG monitoring device of soft protecting net foreign body intrusion |
CN113129530A (en) * | 2021-04-19 | 2021-07-16 | 武汉拥钟智能科技有限公司 | Intelligent security electronic fence alarm system based on Internet of things and machine vision |
CN115019458A (en) * | 2022-04-20 | 2022-09-06 | 中国电子科技集团公司第三十四研究所 | Distributed optical fiber sensing system capable of sensing intrusion target and sensing method |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6204920B1 (en) * | 1996-12-20 | 2001-03-20 | Mcdonnell Douglas Corporation | Optical fiber sensor system |
JP2001311610A (en) * | 2000-04-28 | 2001-11-09 | Occ Corp | Apparatus and method for optical fiber grating measurement |
KR20040065515A (en) * | 2003-01-13 | 2004-07-22 | 글로벌광통신 (주) | Fire detector system to take advantage of multi optical fiber bragg gratings |
-
2006
- 2006-10-10 WO PCT/KR2006/004074 patent/WO2007043794A1/en active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6204920B1 (en) * | 1996-12-20 | 2001-03-20 | Mcdonnell Douglas Corporation | Optical fiber sensor system |
JP2001311610A (en) * | 2000-04-28 | 2001-11-09 | Occ Corp | Apparatus and method for optical fiber grating measurement |
KR20040065515A (en) * | 2003-01-13 | 2004-07-22 | 글로벌광통신 (주) | Fire detector system to take advantage of multi optical fiber bragg gratings |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8436732B2 (en) | 2009-06-03 | 2013-05-07 | Jason Bentley Lamont | Fiber bragg grating perimeter security system |
CN102646308A (en) * | 2012-04-20 | 2012-08-22 | 北京交通大学 | Perimeter security system based on single optical fiber and fiber bragg grating of single optical fiber |
CN105225381A (en) * | 2015-10-14 | 2016-01-06 | 国家电网公司 | A kind of intruding detection system based on optical fiber fence |
CN109059794A (en) * | 2018-09-03 | 2018-12-21 | 刘绍波 | A kind of FBG monitoring device of soft protecting net foreign body intrusion |
CN109059794B (en) * | 2018-09-03 | 2024-03-29 | 刘绍波 | Fiber bragg grating monitoring device for flexible protective net foreign matter intrusion |
CN113129530A (en) * | 2021-04-19 | 2021-07-16 | 武汉拥钟智能科技有限公司 | Intelligent security electronic fence alarm system based on Internet of things and machine vision |
CN113129530B (en) * | 2021-04-19 | 2022-05-31 | 深圳晶华相控科技有限公司 | Intelligent security electronic fence alarm system based on Internet of things and machine vision |
CN115019458A (en) * | 2022-04-20 | 2022-09-06 | 中国电子科技集团公司第三十四研究所 | Distributed optical fiber sensing system capable of sensing intrusion target and sensing method |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US20090269001A1 (en) | Apparatus and Method for Detecting Intrusion by Using Fiber Bragg Grating Sensor | |
EP2649414B1 (en) | Distributed optical fibre sensor | |
WO2007043794A1 (en) | Apparatus and method for detecting intrusion by using fiber bragg grating sensor | |
IL174411A (en) | Fibre-optic surveillance system | |
CN111024283B (en) | Multi-parameter optical fiber sensing detection method and system for down-leading optical cable | |
KR100842174B1 (en) | Apparatus and Method for Detecting Intrusion Using FBG sensors | |
CN101899916A (en) | Optical fiber-containing safety barrier | |
KR101819446B1 (en) | Optical line detection system | |
WO2009116966A1 (en) | Shear pin sensor | |
US10419112B2 (en) | Monitoring system using optical line | |
US20180291726A1 (en) | Using electro acoustic technology to determine annulus pressure | |
US20240110823A1 (en) | Distributed vibration sensing over optical fibers | |
KR20070108319A (en) | Method of guard system fbg | |
KR100363666B1 (en) | Fiber optic intrusion detection systems using an optical fiber net interwoven with a multiple of optical fibers | |
KR20080111234A (en) | Sensing system | |
US20210278256A1 (en) | Displacement Sensor Device | |
EP0936457B1 (en) | Localization of faults in fiber optic systems | |
CN1016098B (en) | Security fence matching optical fibre alarm system with optical fiber warning system adapted | |
CN206860171U (en) | High temperature high voltage resistant optical fiber fully-automatic intelligent senses protection system | |
CN101603842A (en) | A kind of fiber-optic grating sensor | |
CN101598574A (en) | A kind of fiber-optic grating sensor | |
CN101598576A (en) | Survey the method for physical quantity with linear sensor | |
CN101598575A (en) | Survey the method for physical quantity with linear sensor | |
CN101598577A (en) | A kind of fiber-optic grating sensor |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 200680037547.2 Country of ref document: CN |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 12083134 Country of ref document: US |
|
ENP | Entry into the national phase |
Ref document number: 2008535445 Country of ref document: JP Kind code of ref document: A |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 06799154 Country of ref document: EP Kind code of ref document: A1 |