CN103729959A - Polarization intrusion alarm device - Google Patents
Polarization intrusion alarm device Download PDFInfo
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- CN103729959A CN103729959A CN201310699539.6A CN201310699539A CN103729959A CN 103729959 A CN103729959 A CN 103729959A CN 201310699539 A CN201310699539 A CN 201310699539A CN 103729959 A CN103729959 A CN 103729959A
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Abstract
The invention relates to a polarization intrusion alarm device which comprises a light source, a floor base, a polarization detector, an information processor and an alarm. Single mode fibers are arrayed and distributed in the base. The light source is connected with light wave input ends of the single mode fibers in a coupling mode and transmits continuous pulsed light sources to the single mode fibers. The polarization detector is connected with light wave output ends of the single mode fibers in a coupling mode. The polarization detector detects the polarization state of output light waves of the single mode fibers changed due to external vibration. The polarization detector sends the detected polarization state of the single mode fiber to the information processor connected with the polarization detector so as to trigger the alarm connected with the information processor. According to the polarization intrusion alarm device, the single mode fibers of different density are laid in the base based on different security requirements, the polarization state of the single mode fibers is detected through the polarization detector and the polarization state is analyzed by the information processor so that the influences of temperature on the optical fibers are differentiated, concealment and sensitivity of the device are improved and the false alarm rate of the device is lowered.
Description
Technical field
The present invention relates to security protection intrusion alarm field, relate in particular to a kind of polarization intrusion alarm device.
Background technology
Along with the rising of intelligent crime rate, the crypticity of all kinds of invasion formula alarms (device) is required also to become more and more higher.All kinds of invasion formula alarms in the market, light wave or microwave based on the transmitting of alarm transmitting terminal blocked by object or person body in transmitting procedure mostly, and then the transmission of interruption light wave or microwave, cause alarm receiving end normally receiving optical signals or microwave signal, thus the principle of trigger alarm.But, the restriction in transmission based on optical fiber or microwave, the transmitting terminal of alarm and receiving end can not be blocked by object, are difficult to like this guarantee the disguise of warning device when setting up warning device.For lacking concealed warning device, invader can destroy accordingly and prevent warning device and auxiliary equipment before invasion, and, light wave or microwave are easily subject to the interference of external substance in communication process, thereby reduced the sensitivity of invasion formula alarm, even can cause false alarm.
And the sensitivity of existing fiber optic intrusion warning device is low and rate of false alarm is high.
Particularly, existing fiber optic intrusion alarm is mainly divided into two large classes, be two kinds of distributed fiber optic intrusion alarm and non-distributed fiber optic intrusion alarms: distributed fiber optic intrusion alarm be with one whole optical fiber as whole length apart from defence area, the invasion vibration that can occur any point on this optical fiber, positioning reports to the police triggers, such alarm is higher to data throughout and hardware requirement, and sensitivity is relatively low.Non-distributed fiber optic intrusion alarm adopts the variation of the mode sensing light wave of fiber grating or interference, and then acquisition invasion information, but, fiber grating cost is higher, and interfere type sensitivity is too high to such an extent as to wrong report behavior often occurs, and then affected the effect of intrusion alarm device, make warning device lose the due effect that prevents invasion.
Therefore the novel invasion formula warning device that, exigence a kind of disguise in this area is strong, highly sensitive, rate of false alarm is low and should not destroy.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of polarization intrusion alarm device.The problem that invasion formula warning device is disguised poor, the low rate of false alarm of sensitivity is low that the present invention exists for solving prior art.
In order to solve the problems of the technologies described above, the application's object is to be achieved through the following technical solutions:
The invention provides a kind of polarization intrusion alarm device, comprising: the substrate on light source, floor, polarization detector, message handler, alarm; Wherein: single-mode fiber arranged evenly in described substrate; Described light source is coupled to the light wave input end of described single-mode fiber, to single-mode fiber, continues transponder pulse light source; Described polarization detector is coupled to the light wave output terminal of described single-mode fiber; Described polarization detector detects described single-mode fiber due to extraneous vibration, and the polarization state of the output light-wave of the single-mode fiber of the variation causing; Described polarization detector, by the described polarization state of the single-mode fiber detecting, is sent to the described message handler being connected with described polarization detector, to trigger the described alarm being connected with message handler.
Wherein, the height of described single-mode fiber based on safety requirements carries out arranged evenly with different density in substrate; Wherein, the height of described safety requirements, comprising: safety requirements is high, and in substrate, the density of single-mode fiber arranged evenly is high; Safety requirements is low, and in substrate, the density of single-mode fiber arranged evenly is low.
Wherein, the density of described single-mode fiber arranged evenly, affects the sensitivity of single-mode fiber; Single-mode fiber density arranged evenly is higher larger with described substrate contact area, makes sensitivity higher, more easily determines the variation of polarization state, otherwise, density is lower less with described substrate contact area, makes sensitivity lower, the variation of more difficult definite polarization state.
Wherein, described polarization detector is by the described polarization state of the single-mode fiber detecting, be sent to the described message handler being connected with described polarization detector, to trigger the described alarm being connected with message handler, comprise: described message handler receives the described polarization state of the single-mode fiber detecting from polarization detector, and the variation of calculating described polarization state, when the variation occurring surpasses predetermined polarization state threshold value,, according to the variation of described polarization state, trigger described alarm.
Wherein, described substrate comprises lower panel and top panel; A plurality of optical fibre frames are evenly set on described lower panel and set up an office, a plurality of optical fiber draw-in grooves are evenly set on described top panel; The optical fiber draw-in groove of each in setting up an office of a plurality of optical fibre frames on described lower panel on can a corresponding described top panel.
Wherein, single-mode fiber is placed on optical fibre frame sets up an office; Described top panel is covered on described lower panel, and a plurality of optical fiber draw-in grooves of described top panel are accepted a plurality of optical fibre frames of described lower panel and are set up an office.
Wherein, each optical fibre frame shape of setting up an office is identical, and has a groove, and described single-mode fiber is placed in groove; Each sonet card groove shape is identical, and has an outstanding draw-in groove, and makes the shape complementarity of the groove that outstanding draw-in groove and described optical fibre frame set up an office; According to the shape complementarity of described outstanding draw-in groove and described groove, when top panel covers lower panel, can fix the single-mode fiber of plate below arranged evenly, and, when top panel is subject to external force, can protect single-mode fiber.
Wherein, described message handler calculates the variation of polarization state based on Stokes vector.
Wherein, according to the variation track of the Stokes vector in poincare sphere, differentiate temperature or the impact of vibration on polarization state.
Wherein, when polarization detector detects the light wave transmitting in single-mode fiber and occurs special circumstances, polarization detector sends to message handler the early warning signal of makeing mistakes.
Compared with prior art, according to technical scheme of the present invention, there is following beneficial effect:
The present invention detects the polarization state of single-mode fiber in substrate by polarization state detecting device, and is responsible for analyzing by message handler the polarization state that this detects, and knows thus whether invasion has occurred.
Further, the mode that the present invention lays single-mode fiber in substrate has improved the disguise of invasion formula warning device.And the single-mode fiber of different densities can be laid according to the difference of demand for security, to improve the sensitivity of invasion formula warning device.And the present invention can distinguish the impact that temperature on fiber produces, thereby reduced invasion formula warning device rate of false alarm.Improved the sensitivity of invasion formula warning device.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms the application's a part, and schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the structural drawing of the polarization intrusion alarm device of the embodiment of the present invention;
Fig. 2 is the structural drawing of substrate 103 in Fig. 1 of the embodiment of the present invention.And
Fig. 3 is the schematic diagram that the optical fiber polarisation state of the embodiment of the present invention changes.
Embodiment
The invention provides a kind of polarization intrusion alarm device, main thought is, single-mode fiber is layed in substrate, and utilize the distinctive birefringent characteristic of single-mode fiber, based on optical fiber polarisation detection technique, detect the variation of light wave polarization state in transmission, invaded determining whether, with this, improve hidden degree, the sensitivity of invasion formula warning device, and by distinguishing the impact of temperature on polarization state, and then reduced the rate of false alarm of invading formula warning device.
Described birefringent characteristic refers to that light occurs two polarization directions and then forms two different refractive indexes in communication process.The reason of single-mode fiber generation birefringent phenomenon is mainly that the cross section of optical fiber is not desirable circle or optical fiber internal pressure imbalance under effect of stress, and then causes incident light cannot meet the different refractive index that reflects the condition of absolute circle symmetry and occur.For example, under the effect of birefringent characteristic, HE11 mould will have different velocity of propagation in different polarization directions, thereby two orthogonal polarized lights will no longer be propagated with same speed.
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with drawings and the specific embodiments, the present invention is described in further detail.
Optical polarization pressure type intrusion alarm of the present invention floor can comprise: light source, substrate, polarization detector, message handler, alarm, wait ingredient.And, can be in substrate optical fiber arranged evenly, one end of optical fiber connects light source, the other end connects polarization detector.Polarization detector is connected with message handler signal, and the polarization state data in the optical fiber detecting are sent to message handler.Message handler is connected to alarm, according to the variation of polarization state, and trigger alarm device.
According to embodiments of the invention, provide a kind of polarization intrusion alarm device.
With reference to figure 1, Fig. 1 is according to the structural drawing of the polarization intrusion alarm device of the embodiment of the present invention.
At polarization intrusion alarm device of the present invention, can comprise: light source 101, substrate 103, polarization detector 105, message handler (MCU) 107, alarm 109, power supply 111, optical fiber (not shown in figure 1).
Optical fiber arranged evenly in substrate 103, light source 101 is coupled to the one end that is placed in the optical fiber in substrate 103, and be optical fiber input pulse light source, particularly, described optical fiber can be single-mode fiber, single-mode fiber intermode dispersion is little, decay little, be with roomy, and the phase place of light wave in single-mode fiber, polarization, the physical quantity that amplitude etc. apply for the external world is extremely responsive, as: vibration, the physical quantitys such as temperature all can make the light in optical fiber that certain variation occurs, as, there is or change the birefringence of the light transmitting in single-mode fiber, and then changed the polarization state of output light-wave.
Be illustrated in figure 2 the structural drawing of substrate 103 in Fig. 1 of the embodiment of the present invention.
Substrate 103 can comprise that lower panel 201, top panel 205(are as shown in Fig. 2-1).
A plurality of optical fibre frames are evenly set on plate 201 below and set up an office 2011, and the plurality of optical fibre frame set up an office 2011 shapes just as, each optical fibre frame is set up an office and 2011 is had a cross optical fiber and set up groove, the optical fibre frame that single-mode fiber 203 can be placed to lower panels 201 be set up an office in the groove of 2011 either direction (horizontal positioned or vertically place), as shown in Fig. 2-2.
A plurality of optical fiber draw-in grooves 2051 are evenly set on plate 205 in the above, and a plurality of optical fiber draw-in groove 2051 shapes just as, each optical fiber draw-in groove 2051 has an outstanding cross draw-in groove, this cross draw-in groove and cruciform groove shape complementarity, therefore, optical fibre frame is set up an office and 2011 can be accepted optical fiber draw-in groove 2051, or this optical fibre frame set up an office 2011 and optical fiber draw-in groove 2051 can mesh, and the optical fiber draw-in groove 2051 of each that can guarantee that a plurality of optical fibre frames on plate 201 below set up an office in 2011 on can a corresponding top panel 205, described top panel 205 is covered on described lower panel 201, a plurality of optical fiber draw-in grooves 2051 of described top panel 205 are accepted a plurality of optical fibre frames of described lower panel 201 and are set up an office 2011.As Figure 2-3.
Thereby; on plate 201, cover below top panel 205 and can fix the single-mode fiber 203 being arranged on lower panel 201; and guarantee when top panel 205 is applied to external force; single-mode fiber 203 can not be pressed down; for example; substrate can be used the material that hardness is high, but optical fiber draw-in groove 2051 adopts the moderate material of hardness, thereby plays the effect of protection single-mode fiber.
The laying density of single-mode fiber 203 affects the sensitivity of single-mode fiber 203, the larger sensitivity of laying density of single-mode fiber 203 is higher, the sensitiveer polarization state detecting of describing below, when calculating, more easily find the variation of polarization state, one there is pressure a little, polarization state just detected, once calculating, find that this polarization state has produced variation; Contrary, the density of single-mode fiber 203 more sluggishness is lower, and the variation of more insensitive this polarization state is more not easy to find.Particularly, the higher contact area of laying density of single-mode fiber 203 is larger, for the vibration occurring, as occurred trampling on plate 205 in the above, in this single-mode fiber 203, there is so the more optical-fiber deformation of multistage, the more multipair impact in light transmission that deformation occurs is also just larger, just more accurate for determining of intrusion behavior.So, if Fig. 2-4 are to single-mode fiber 203 being arranged on lower panel 201 uniformly as shown in Fig. 2-6, also can lay according to user's demand the single-mode fiber 203 of different densities, in different positions, lay the single-mode fiber 203 of different densities, and top panel 205 is covered to lower panel 203, to improve safety.
Particularly, substrate 103 can be installed on the ground, according to user to sensitivity need in substrate 103, lay the single-mode fiber 203 of different densities, and can use fixedly single-mode fiber 203 of specific glue.Setting completed in substrate 103, and the floor can be used as in daily life is used, and improves the disguise of invasion formula warning device by such mode.
Power supply 111 is connected with light source 101, polarization detector 105, message handler 107 respectively, and can provide low-voltage power supply for light source 101, polarization detector 105, message handler 107.
Light source 101 can be to the single-mode fiber 203 end output light sources that are arranged in substrate 103, for example: 45 ° of linearly polarized lights, this light source 101 can be controlled the wavelength of light source of output in C-band, as selected operation wavelength at 1550nm or 1310nm, wherein, when operation wavelength can effectively reduce the loss that fibre-optical dispersion brings during in 1550nm, increase the sensitivity of single-mode fiber, and the linearly polarized light of these light source 101 transmittings transfers to polarization detector 105 by single-mode fiber 203.
Described polarization detector 105 is coupled to substrate 103, and further, this polarization detector 105 can be connected with the other end of single-mode fiber 203 in substrate 103.Polarization detector 105 receives the linearly polarized light of exporting from the single-mode fiber 203 of substrate 103.Described polarization detector 105 can adopt Stokes vector to carry out Polarization Detection.
Polarization detector 105 detects the linearly polarized light receiving based on optical fiber polarisation state detection technique.The optical fiber polarisation state checkout equipment that can adopt comprises the contour quick-action state of GP, Agilent polarization state checkout equipment.Thereby can utilize corresponding polarization state detecting device 105, the polarization state in single-mode fiber 103 detected rapidly, this polarization state can refer to the vibrational state miscellaneous that the light vector E of shear wave in the plane vertical with the direction of propagation has, and the vibrational state in this vertical plane can be known as polarization state.Further, can this polarisation of light state be converted into polarization state data by analog-digital commutator (not shown), and the polarization state data that this is detected send to message handler 107.Wherein, described digiverter can be built in polarization detector 105, also can independently arrange.
Described message handler 107 is connected with described polarization detector 105 signals, and wherein, described signal connects the connection that can include linear formula or wireless.
Message handler 107 receives the polarization state data of linearly polarized light in the single-mode fiber 203 detecting from polarization detector 105, and the polarization state data based on receiving, to this polarization state data analysis and processing.Described message handler 107, according to linear polarization polarisation of light situation, starts alarm 109 and implements to report to the police.
Particularly, when opening polarization intrusion alarm device of the present invention, at power supply 111, provide under the prerequisite of power supply, the single-mode fiber 203 transponder pulse light sources that light source 101 continues in basad 103, invader basad 103 exerts pressure, as, trample floor surface, pressure is applied on single-mode fiber 203 and is made single-mode fiber 203 that deformation occur by floor, changed the birefringent characteristic of the light wave of transmission in single-mode fiber 203, thereby changed the polarization state Stokes vector of output terminal light wave, polarization detector 105 detects the polarization state data in single-mode fiber 203 constantly, and light signal (polarization state) is transformed into electrical signal transfer to message handler 107, the information that 107 pairs of these electric signal of message handler carry is analyzed, learn that substrate 103 is triggered by external force, at this moment message handler 107 startup alarms 109 give the alarm.
Particularly, polarization detector 105 detects the polarisation of light state of transmission in single-mode fiber 203, and these polarization state data are passed to message handler 107, message handler 107 compares these polarization state data and predetermined polarization state threshold value, if these polarization state data are less than or equal to this threshold value, the polarization state that explanation detects can be accepted, do not invade, when these polarization state data are greater than this threshold value, the polarization state that explanation detects has exceeded acceptable scope, in the scope that this polarization intrusion alarm device is monitored, occurs invader.For example, when invader tramples floor surface, the pressure producing is applied on single-mode fiber 203 by top panel 205, thereby changed the birefringent characteristic of single-mode fiber 203, and then changed the polarization state of output light-wave, according to the predetermined polarization state threshold value of Stokes variation characteristic, for the scope dictates vibration behavior by certain.
Can be by the individual quantities of the Stokes vector of polarization state be carried out to on-line measurement in polarization intrusion alarm device of the present invention, wherein, Stokes vector is a kind of method for expressing of polarization state, the corresponding specific Stokes vector of each specific polarization state, for example, the polarization state that temperature causes changes a corresponding Stokes vector, and the polarization state that vibration causes changes a corresponding Stokes vector.Wherein, Stokes variation characteristic, is in stationary state, there is a fixing polarization state, and when vibration occurs, the variation that can produce polarization state, the difference changing according to polarization state detects, and can utilize the variation of this difference and polarization state threshold value to compare, and then differentiates vibrating intruding.
Further, the mode that the present invention can also utilize Stokes vector to calculate polarization state is distinguished vibration and the impact of temperature on light, be illustrated in figure 3 the schematic diagram of the optical fiber polarisation state variation of the embodiment of the present invention, when temperature variation applies deformation with vibration to optical fiber, the circle that Stokes vector variation track in poincare sphere is different axis, therefore can differentiate/distinguish the impacts of environmental factor on polarization state such as temperature or vibration.Wherein, described poincare sphere is the three-dimensional sphere of introducing at Stokes Space, be used for representing polarisation of light state, wherein, S1, S2, S3 be X, Y, the Z coordinate axis of corresponding three-dimensional sphere respectively, and from the centre of sphere (true origin) to sphere, the vector of any is the Stokes vector of complete polarized light, at the lip-deep every bit of poincare sphere, be all certain special polarization state, when vibration changes, the track of this point is a specific circle.And temperature is when change, this point (original point) can be in the direction of two circles Orthogonal Decomposition go out the track of two variable quantities, one of them circle (locus circle R1) is the formed track of variable quantity that vibration causes, another circle (temperature variation locus circle R2) is the formed track of variable quantity that temperature variation causes, and this locus circle R2 is the circle different from the locus circle R1 of vibration variable quantity, therefore can distinguish vibration and temperature.In other words, due to vibration and temperature variation be two different circles, so there is not the situation of interference, therefore, reduced the impact of temperature on polarization state.
While there are special circumstances in the light wave that transmission detected in single-mode fiber 203 when polarization detector 105, be some special characteristic state/situations, for example, there is fracture or occur macrolesion in the light wave that polarization detector 105 receives, the optical fiber output power detecting in the polarization state test side of optical fiber will reduce or vanishing, with this, can be used as judgement.Further, when light wave being detected and occur feature situation, polarization detector 105 sends to message handler 107 early warning signal of makeing mistakes, in order to notify related personnel to carry out troubleshooting processing.
When polarization state data being detected and be greater than default threshold value, message handler 107 trigger alarm devices 109, Realtime Alerts.
The foregoing is only embodiments of the invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in claim scope of the present invention.
Claims (10)
1. a polarization intrusion alarm device, is characterized in that, comprising: the substrate on light source, floor, polarization detector, message handler, alarm; Wherein:
Single-mode fiber arranged evenly in described substrate;
Described light source is coupled to the light wave input end of described single-mode fiber, to single-mode fiber, continues transponder pulse light source;
Described polarization detector is coupled to the light wave output terminal of described single-mode fiber;
Described polarization detector detects described single-mode fiber due to extraneous vibration, and the polarization state of the output light-wave of the single-mode fiber of the variation causing;
Described polarization detector, by the described polarization state of the single-mode fiber detecting, is sent to the described message handler being connected with described polarization detector, to trigger the described alarm being connected with message handler.
2. device according to claim 1, is characterized in that, comprising:
The height of described single-mode fiber based on safety requirements carries out arranged evenly with different density in substrate; Wherein, the height of described safety requirements, comprising:
Safety requirements is high, and in substrate, the density of single-mode fiber arranged evenly is high;
Safety requirements is low, and in substrate, the density of single-mode fiber arranged evenly is low.
3. device according to claim 2, is characterized in that, comprising:
The density of described single-mode fiber arranged evenly, affects the sensitivity of single-mode fiber;
Single-mode fiber density arranged evenly is higher larger with described substrate contact area, makes sensitivity higher, more easily determines the variation of polarization state, otherwise, density is lower less with described substrate contact area, makes sensitivity lower, the variation of more difficult definite polarization state.
4. device according to claim 1, it is characterized in that, described polarization detector, by the described polarization state of the single-mode fiber detecting, is sent to the described message handler being connected with described polarization detector, to trigger the described alarm being connected with message handler, comprising:
Described message handler receives the described polarization state of the single-mode fiber detecting from polarization detector, and the variation of calculating described polarization state, when the variation occurring surpasses predetermined polarization state threshold value, according to the variation of described polarization state, triggers described alarm.
5. device according to claim 1, is characterized in that, comprising:
Described substrate comprises lower panel and top panel;
A plurality of optical fibre frames are evenly set on described lower panel and set up an office, a plurality of optical fiber draw-in grooves are evenly set on described top panel;
The optical fiber draw-in groove of each in setting up an office of a plurality of optical fibre frames on described lower panel on can a corresponding described top panel.
6. device according to claim 5, is characterized in that, comprising:
Single-mode fiber is placed on optical fibre frame sets up an office;
Described top panel is covered on described lower panel, and a plurality of optical fiber draw-in grooves of described top panel are accepted a plurality of optical fibre frames of described lower panel and are set up an office.
7. according to the device described in claim 5 or 6, it is characterized in that:
Each optical fibre frame shape of setting up an office is identical, and has a groove, and described single-mode fiber is placed in groove;
Each sonet card groove shape is identical, and has an outstanding draw-in groove, and makes the shape complementarity of the groove that outstanding draw-in groove and described optical fibre frame set up an office;
According to the shape complementarity of described outstanding draw-in groove and described groove, when top panel covers lower panel, can fix the single-mode fiber of plate below arranged evenly, and, when top panel is subject to external force, can protect single-mode fiber.
8. according to the arbitrary described device of claim 1 to 7, it is characterized in that, comprising: described message handler calculates the variation of polarization state based on Stokes vector.
9. device according to claim 8, is characterized in that: according to the variation track of the Stokes vector in poincare sphere, differentiate temperature or the impact of vibration on polarization state.
10. according to the arbitrary described device of claim 1 to 9, it is characterized in that, also comprise: when polarization detector detects the light wave transmitting in single-mode fiber and occurs special circumstances, polarization detector sends to message handler the early warning signal of makeing mistakes.
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| CN105551163A (en) * | 2016-02-29 | 2016-05-04 | 刘海 | Intelligent optical fiber antitheft device |
| CN107490429A (en) * | 2017-07-21 | 2017-12-19 | 国网上海市电力公司 | A kind of anti-error excavation prior-warning device of underground cable |
| CN109920182A (en) * | 2018-12-29 | 2019-06-21 | 国网北京市电力公司 | Protection processing method, device, storage medium and electronic device |
| CN111510209A (en) * | 2020-04-10 | 2020-08-07 | 中国信息通信研究院 | Optical fiber vibration monitoring method and device |
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| CN103729959B (en) | 2016-06-08 |
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