CN103337120A - Addressing method and system for quasi-distributed fiber bragg grating perimeter intrusion alarming system - Google Patents
Addressing method and system for quasi-distributed fiber bragg grating perimeter intrusion alarming system Download PDFInfo
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Abstract
The invention discloses an addressing method and an addressing system for a quasi-distributed fiber bragg grating perimeter intrusion alarming system. The addressing method for the quasi-distributed fiber bragg grating perimeter intrusion alarming system comprises the following steps: acquiring real-time wavelength data information of each fiber bragg grating sensor; calculating wavelength reference values of the fiber bragg grating sensors, and excluding influence of a temperature drift effect; calculating wavelength deviation variations of the fiber bragg grating sensors, and judging whether the wavelength deviation variations meet a preset sensitivity threshold triggering condition; if ,the wavelength deviation variations meet a preset sensitivity threshold triggering condition, selecting a data sequence which has a preset time span and whose wavelength deviation changes along with the time, and calculating low-frequency signal energy within the time span; calculating and comparing low-frequency energy of adjacent fiber bragg grating sensors, selecting a fiber bragg grating sensor with the maximum low-frequency energy, and recognizing the position of the fiber bragg grating sensor as an intrusion address so as to give an alarm. According to the addressing method and the addressing system, the invasion addressing accuracy is improved, the environmental adaptability of the quasi-distributed fiber bragg grating perimeter intrusion alarming system is enhanced, and market promotion of the fiber bragg grating perimeter intrusion alarming system is facilitated.
Description
Technical field
The present invention relates to circumference security and guard technology and optical fiber grating sensing network signal processing method field, relate in particular to a kind of addressing method and system of quasi-distributed fiber grating circumference intrusion alarm system.
Background technology
Existing Fiber Bragg Grating intelligently addressing circumference invasion self-adaptive warning system (CN101840615) mainly is to judge whether to report to the police by the size to single-sensor wave-type vibration amplitude.Optical fiber perimeter intrusion system (CN101556724) exists the location inaccurate simultaneously, the defective that rate of false alarm is higher.The intrusion detection of anti-intrusion system sensing network and localization method (CN 101860866 B) at be extraction to the single-sensor characteristic information; The implementation method of optical fiber vibration processor system (CN 101639963) utilizes the mode of FPGA and DSP combination to handle by the SVM algorithm, and data processing algorithm is comparatively complicated.Utilize the Hilbert conversion to ask for the temporal envelope signal based on temporal envelope analysis fiber grating circumference intrusion behavior recognition methods and system (CN 102968868) to the pretreated signal of process; The temporal envelope signal is carried out the branch frame, and the temporal envelope signal of every frame is carried out the characteristic parameter extraction; The pattern-recognition of vibrating behavior according to value and the predefined characteristic parameter threshold value of characteristic parameter.A kind of fiber grating periphery intrusion preventing system and alarm method thereof (CN 102521939) carry out frequency domain to the wavelength information of the abnormal signal under the pre-alarm state to be differentiated, and keeps effective illegal invasion behavioural information, finishes alarm procedure.All there is following defective and apply bottleneck in these systems: (1) can't accurately locate, and can't satisfy among a small circle, the demand in high-grade strick precaution field; (2), rate of false alarm height poor in the anti-environment capacity of high sensitivity condition system of following time causes range of application to be restricted.
Summary of the invention
The technical problem to be solved in the present invention be in the prior art under the high sensitivity condition, can not accurately identify the invasion position, the defective that the rate of false alarm of system is higher, provide under a kind of high sensitivity condition, can accurately identify the invasion position, the rate of false alarm index of further reduction system, addressing method and the system of the quasi-distributed fiber grating circumference intrusion alarm system of raising system reliability.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of addressing method of quasi-distributed fiber grating circumference intrusion alarm system is provided, may further comprise the steps:
Obtain the real-time wavelength data information of each fiber-optic grating sensor;
According to described real-time wavelength data information calculations fiber grating sensor wavelength reference value, and the deduction temperature is floated the influence that effect is extracted vibration signal;
Calculate fiber grating sensor wavelength deviation variable quantity according to described wavelength standard value, and judge whether this wavelength offset variable quantity satisfies the threshold of sensitivity trigger condition that sets in advance;
If the wavelength offset variable quantity satisfies the threshold of sensitivity trigger condition that sets in advance, then choose the time dependent data sequence of wavelength offset of Preset Time length, and calculate the signal low frequency energy of this section period inner fiber grating sensor;
The low frequency energy of the fiber-optic grating sensor that calculating closes on, and comparing is selected the fiber-optic grating sensor with maximum low frequency energy, with the location recognition of this fiber-optic grating sensor for the invasion address, to report to the police.
In the method for the present invention, described low frequency energy is the signal spectrum component sum in the 0.5-10Hz frequency range.
In the method for the present invention, described fiber-optic grating sensor is connected on the vibration optical cable, and the vibration optical cable is line style and lays.
In the method for the present invention, the described fiber-optic grating sensor that closes on is first three and back three sensors of the sensor of the satisfied threshold of sensitivity trigger condition that sets in advance.
The present invention solves another technical scheme that its technical matters adopts:
A kind of addressing system of quasi-distributed fiber grating circumference intrusion alarm system is provided, comprises:
Real-time wavelength data information acquisition module is for the real-time wavelength data information of obtaining each fiber-optic grating sensor;
Wavelength standard value computing module is used for according to described real-time wavelength data information calculations fiber grating sensor wavelength reference value, and the deduction temperature is floated the influence that effect is extracted vibration signal;
Wavelength offset variable quantity computing module is used for calculating fiber grating sensor wavelength deviation variable quantity according to described wavelength standard value;
Judge module is used for judging whether the wavelength offset variable quantity satisfies the threshold of sensitivity trigger condition that sets in advance;
Signal low frequency energy computing module, be used for when the wavelength offset variable quantity satisfies the threshold of sensitivity trigger condition that sets in advance, choose the time dependent data sequence of wavelength offset of Preset Time length, and calculate the signal low frequency energy of this section period inner fiber grating sensor; And the low frequency energy that calculates the fiber-optic grating sensor that closes on;
The addressing module is used for the low frequency energy of the fiber-optic grating sensor relatively close on, selects the fiber-optic grating sensor with maximum low frequency energy, with the location recognition of this fiber-optic grating sensor for the invasion address, to report to the police.
In the system of the present invention, the low frequency energy that described signal low frequency energy computing module calculates is the signal spectrum component sum in the 0.5-10Hz frequency range.
In the system of the present invention, described fiber-optic grating sensor is connected on the vibration optical cable, and the vibration optical cable is line style and lays.
In the system of the present invention, the described fiber-optic grating sensor that closes on is first three and back three sensors of the sensor of the satisfied threshold of sensitivity trigger condition that sets in advance.
The beneficial effect that the present invention produces is: the present invention is by calculating fiber grating sensor wavelength deviation variable quantity, when it satisfies the threshold of sensitivity trigger condition that sets in advance, choose the time dependent data sequence of wavelength offset of Preset Time length, and calculate the signal low frequency energy of this section period inner fiber grating sensor; And calculate the low frequency energy of the fiber-optic grating sensor close on, compare, select the fiber-optic grating sensor with maximum low frequency energy, with the location recognition of this fiber-optic grating sensor for the invasion address, to report to the police.Realized that quasi-distributed fiber grating circumference safety-protection system is not failed to report, the technical requirement of few wrong report, when having guaranteed that system moves under the high sensitivity condition, intrusion behavior is a sensor output alarm only, improved the addressing precision to intrusion behavior, make the environmental suitability of system strengthen, promoted the marketing of fiber grating circumference intrusion alarm system.
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Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the addressing method process flow diagram of the quasi-distributed fiber grating circumference intrusion alarm system of the embodiment of the invention;
Fig. 2 is the embodiment of the invention at sensor number is the signal energy distribution schematic diagram that approaching sensor when crossing is simulated in 5 position;
Fig. 3 is that embodiment of the invention poling formula optical fiber raster vibration optical cable is installed the laying structure synoptic diagram;
Fig. 4 is the structural representation of addressing system of the quasi-distributed fiber grating circumference intrusion alarm system of the embodiment of the invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explaining the present invention, and be not used in restriction the present invention.
The present invention can realize that quasi-distributed fiber grating circumference safety-protection system is not failed to report, the technical requirement of few wrong report, when having guaranteed that system moves under the high sensitivity condition, intrusion behavior is a sensor output alarm only, improved the addressing precision to intrusion behavior, make the environmental suitability of system strengthen, promoted the marketing of fiber grating circumference intrusion alarm system.
As shown in Figure 1, the addressing method of embodiment of the invention quasi-distributed fiber grating circumference intrusion alarm system may further comprise the steps:
S101, obtain the real-time wavelength data information of each fiber-optic grating sensor;
S102, basis be wavelength data information calculations fiber grating sensor wavelength reference value in real time, and the deduction temperature is floated the influence that effect is extracted vibration signal;
S103 calculates fiber grating sensor wavelength deviation variable quantity according to the wavelength standard value;
S104, judge that whether this wavelength offset variable quantity satisfies the threshold of sensitivity trigger condition that sets in advance;
S105, if the wavelength offset variable quantity satisfies the threshold of sensitivity trigger condition set in advance, then choose the time dependent data sequence of wavelength offset of Preset Time length, and calculate the signal low frequency energy of this section period inner fiber grating sensor; In one embodiment of the invention, low frequency energy is the signal spectrum component sum in the 0.5-10Hz frequency range.
The low frequency energy of the fiber-optic grating sensor that S106, calculating close on, and compare;
S107, select the fiber-optic grating sensor with maximum low frequency energy, with the location recognition of this fiber-optic grating sensor for the invasion address, to report to the police.In the preferred embodiment of the present invention, the fiber-optic grating sensor that closes on is first three and back three sensors of the sensor of the satisfied threshold of sensitivity trigger condition that sets in advance.
Further, in one embodiment of the present of invention, fiber-optic grating sensor is connected on the vibration optical cable, and the vibration optical cable is line style and lays.
Can utilize a plurality of optical fibre grating acceleration sensors of serial connection to carrying out the appearance position that intrusion behavior is identified in spatial sampling with once climbing conduction and the distribution of signal energy in the steel pipe support structure of crossing intrusion behavior in the embodiment of the invention, make a plurality of sensors of anti-intrusion system under higher sensitivity parameter condition, seek out accurately the strongest position of excitation energy, thereby intrusion behavior is carried out addressing.Avoid when the high sensitivity threshold parameter arranges, with the situation appearance of an equal output alarm state of a plurality of sensors of intrusion behavior, the reliability that the raising system identifies and judges the invasion position.The spatial characteristics of signal energy feature is: the energy value maximum of the vibration signal that the nearest sensor in distance invasion position obtains, along with the conduction of mechanical vibration in the elasticity media, the signal intensity that the sensor of adjacent locations is experienced weakens gradually, thoroughly dissipates until signal.Signal when not having invasion does not then possess vibration signal when transmit in the elasticity media, and energy is the rule of attenuation type space distribution, and has the space distribution of the signal energy when invading to be the unimodal function distributions.As shown in Figure 2, invasion is simulated when crossing excitation in the position near No. five sensor, six sensors that close on carry out spatial sampling to the conduction behavior of the vibrational energy of the behavior, the energy value maximum that No. five sensor obtains, the sensor of its both sides is along with the increase of distance driving source space length, and the energy that sensor is experienced disturbing signal successively decreases successively.According to this method, at first extract a plurality of sensors the time become the low frequency energy of wavelength signals, in the size of each energy values relatively, providing with the sensor sequence number then is horizontal ordinate, the signal energy value is the curve map of ordinate, namely can judge the invasion position.
As shown in Figure 3, the circumference intrusion alarm pick-up unit that the specific embodiment of the invention adopts, the detection front end that is installed in the circumference scene is made up of four parts: be erected at support 1, welded tube 2 on the body of wall, welded tube connects with sleeve pipe 3 and vibrates one of optical cable 4(by the armouring that the optical fibre grating acceleration sensor serial connection forms and vibrate 20 sensors of optical cable serial connection, transducer spacing is at 6 ~ 12 meters), vibration or strain signal when invaded for the perception circumference; Adopt fiber Bragg grating (FBG) demodulator that sensor signal is carried out demodulation, then by signal processing host (maybe can realize system for carrying out said process) to the time become fiber-optic grating sensor the time become wavelength signals and handle in real time, judge to have or not invasion and to carry out sound and light alarm, provide and show intrusion detection and positioning result thereof.
The specific implementation method of the circumference intrusion alarm system of enumerating in the embodiment of the invention that is based on the concatenation type optical fibre grating acceleration sensor, addressing method of the present invention can be applied in the periphery intrusion preventing alarm system of the optics based on other types, electric class or hybrid quasi-distributed acceleration transducer or array of pressure sensors fully.
The addressing system of the quasi-distributed fiber grating circumference intrusion alarm system of the embodiment of the invention is used for realizing said method, as shown in Figure 4, comprising:
Real-time wavelength data information acquisition module 10 is for the real-time wavelength data information of obtaining each fiber-optic grating sensor;
Wavelength standard value computing module 20 is used for according to real-time wavelength data information calculations fiber grating sensor wavelength reference value, and the deduction temperature is floated the influence that effect is extracted vibration signal;
Wavelength offset variable quantity computing module 30 is used for calculating fiber grating sensor wavelength deviation variable quantity according to the wavelength standard value;
Judge module 40 is used for judging whether the wavelength offset variable quantity satisfies the threshold of sensitivity trigger condition that sets in advance;
Signal low frequency energy computing module 50, be used for when the wavelength offset variable quantity satisfies the threshold of sensitivity trigger condition that sets in advance, choose the time dependent data sequence of wavelength offset of Preset Time length, and calculate the signal low frequency energy of this section period inner fiber grating sensor; And the low frequency energy that calculates the fiber-optic grating sensor that closes on; In a preferred embodiment of the present invention, the fiber-optic grating sensor that closes on is first three and back three sensors of the sensor of the satisfied threshold of sensitivity trigger condition that sets in advance.
Addressing module 60 is used for the low frequency energy of the fiber-optic grating sensor relatively close on, selects the fiber-optic grating sensor with maximum low frequency energy, with the location recognition of this fiber-optic grating sensor for the invasion address, to report to the police.
In the embodiment of the invention, the low frequency energy that signal low frequency energy computing module calculates is the signal spectrum component sum in the 0.5-10Hz frequency range.
In the embodiments of the invention, fiber-optic grating sensor is connected on the vibration optical cable, and the vibration optical cable is line style and lays.
Should be understood that, for those of ordinary skills, can be improved according to the above description or conversion, and all these improvement and conversion all should belong to the protection domain of claims of the present invention.
Claims (8)
1. the addressing method of a quasi-distributed fiber grating circumference intrusion alarm system is characterized in that, may further comprise the steps:
Obtain the real-time wavelength data information of each fiber-optic grating sensor;
According to described real-time wavelength data information calculations fiber grating sensor wavelength reference value, and the deduction temperature is floated the influence that effect is extracted vibration signal;
Calculate fiber grating sensor wavelength deviation variable quantity according to described wavelength standard value, and judge whether this wavelength offset variable quantity satisfies the threshold of sensitivity trigger condition that sets in advance;
If the wavelength offset variable quantity satisfies the threshold of sensitivity trigger condition that sets in advance, then choose the time dependent data sequence of wavelength offset of Preset Time length, and calculate the signal low frequency energy of this section period inner fiber grating sensor;
The low frequency energy of the fiber-optic grating sensor that calculating closes on, and comparing is selected the fiber-optic grating sensor with maximum low frequency energy, with the location recognition of this fiber-optic grating sensor for the invasion address, to report to the police.
2. method according to claim 1 is characterized in that, described low frequency energy is the signal spectrum component sum in the 0.5-10Hz frequency range.
3. method according to claim 1 is characterized in that, described fiber-optic grating sensor is connected on the vibration optical cable, and the vibration optical cable is line style and lays.
4. method according to claim 3 is characterized in that, the described fiber-optic grating sensor that closes on is first three and back three sensors of the sensor of the satisfied threshold of sensitivity trigger condition that sets in advance.
5. the addressing system of one kind quasi-distributed fiber grating circumference intrusion alarm system is characterized in that, comprising:
Real-time wavelength data information acquisition module is for the real-time wavelength data information of obtaining each fiber-optic grating sensor;
Wavelength standard value computing module is used for according to described real-time wavelength data information calculations fiber grating sensor wavelength reference value, and the deduction temperature is floated the influence that effect is extracted vibration signal;
Wavelength offset variable quantity computing module is used for calculating fiber grating sensor wavelength deviation variable quantity according to described wavelength standard value;
Judge module is used for judging whether the wavelength offset variable quantity satisfies the threshold of sensitivity trigger condition that sets in advance;
Signal low frequency energy computing module, be used for when the wavelength offset variable quantity satisfies the threshold of sensitivity trigger condition that sets in advance, choose the time dependent data sequence of wavelength offset of Preset Time length, and calculate the signal low frequency energy of this section period inner fiber grating sensor; And the low frequency energy that calculates the fiber-optic grating sensor that closes on;
The addressing module is used for the low frequency energy of the fiber-optic grating sensor relatively close on, selects the fiber-optic grating sensor with maximum low frequency energy, with the location recognition of this fiber-optic grating sensor for the invasion address, to report to the police.
6. system according to claim 5 is characterized in that, the low frequency energy that described signal low frequency energy computing module calculates is the signal spectrum component sum in the 0.5-10Hz frequency range.
7. system according to claim 5 is characterized in that, described fiber-optic grating sensor is connected on the vibration optical cable, and the vibration optical cable is line style and lays.
8. system according to claim 7 is characterized in that, the described fiber-optic grating sensor that closes on is first three and back three sensors of the sensor of the satisfied threshold of sensitivity trigger condition that sets in advance.
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| CN104794839A (en) * | 2015-04-27 | 2015-07-22 | 武汉世纪金桥安全技术有限公司 | POTDR (polarization optical time domain reflectometer) based optical fiber intrusion recognition algorithm |
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| CN111341049A (en) * | 2020-03-31 | 2020-06-26 | 华中科技大学 | Tunnel foreign matter invasion identification and positioning method and device |
| CN112268608A (en) * | 2020-10-13 | 2021-01-26 | 中国南方电网有限责任公司超高压输电公司贵阳局 | High-precision demodulation algorithm for strong interference DVS |
| CN113341477A (en) * | 2021-06-02 | 2021-09-03 | 江苏城乡空间规划设计研究院有限责任公司 | Urban green land protection method and system |
| CN115394024A (en) * | 2022-08-10 | 2022-11-25 | 武汉烽理光电技术有限公司 | Method and device for monitoring and predicting walking based on grating array |
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| CN112268608A (en) * | 2020-10-13 | 2021-01-26 | 中国南方电网有限责任公司超高压输电公司贵阳局 | High-precision demodulation algorithm for strong interference DVS |
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| CN115394024A (en) * | 2022-08-10 | 2022-11-25 | 武汉烽理光电技术有限公司 | Method and device for monitoring and predicting walking based on grating array |
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