CN110164068B - Stress detection guardrail - Google Patents
Stress detection guardrail Download PDFInfo
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- CN110164068B CN110164068B CN201910491369.XA CN201910491369A CN110164068B CN 110164068 B CN110164068 B CN 110164068B CN 201910491369 A CN201910491369 A CN 201910491369A CN 110164068 B CN110164068 B CN 110164068B
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- 238000001514 detection method Methods 0.000 title claims abstract description 58
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 108
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- 230000003287 optical effect Effects 0.000 claims abstract description 21
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- 239000013307 optical fiber Substances 0.000 claims description 20
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
- G01B11/18—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge using photoelastic elements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/242—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre
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- 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
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Geophysics And Detection Of Objects (AREA)
- Burglar Alarm Systems (AREA)
Abstract
The invention discloses a stress detection guardrail. Including a plurality of control levers that the structure is the same, at least one steel wire cable has been put up in parallel between arbitrary two control levers, the inside of the casing of control lever is vertical to be provided with the response shell fragment, be provided with fiber grating sensor on the response shell fragment, the first control lever in arbitrary two control levers is fixed to the one end of steel wire cable, the other end passes the response shell fragment in the second control lever, and further be connected to the one end of a spring, the other end of spring is fixed on the spring fixing base in the second control lever, after the steel wire cable is taut between two control levers, the steel wire cable pass through the solidus ware with response shell fragment fixed connection, fiber grating sensor passes through the optical cable and is connected to fiber grating demodulator. The guardrail has reasonable structural design, and can realize reliable detection and reduce false alarm detection.
Description
Technical Field
The invention relates to the technical field of security monitoring, in particular to a stress detection guardrail.
Background
In the prior art, the perimeter security fence mainly comprises the following components: physical check fence, high-voltage electric fence, vibration monitoring fence, electronic pulse fence, and fence with additional vision screen monitoring and infrared monitoring system, the traditional security fence has certain defects.
Firstly, a physical grid fence only has a theoretical deterrence effect, cannot effectively achieve a real-time monitoring effect, and cannot be known even if an external invasion exists; the high-voltage electric fence has high risk, and once an unknowing person accidentally touches the fence, life safety risks exist, and the fence cannot be used in special places such as areas with inflammable and explosive objects and areas with high people flow; vibration monitoring fence, because of the specificity of the sensor, weather, beasts touch, environmental resonance and the like can influence the monitoring effect, the false alarm rate is very high, and accurate monitoring of targets cannot be effectively realized; the electronic pulse fence has very high requirements on the environment, especially electromagnetic interference, so that some special sites cannot be used; the fence with the camera or the infrared equipment can interfere with fog day and night monitoring. The fence has high false alarm rate, is over-sensitive or has insufficient sensitivity for judging the intrusion signal. And the false alarm rate is high, so that effective monitoring cannot be achieved.
In the prior art, a chinese patent application "a vibration sensitive optical fiber warning fence" (application number 201711062842. X) is disclosed, in which a perimeter fence is formed by winding a metal wire slot body around a perimeter stake, an induction optical fiber is provided in the perimeter fence, an alarm host is connected with the induction optical fiber, the metal wire slot body here includes a wire slot and a wire slot cover with a transverse cross section in a right-angle U shape, and the induction optical fiber is sandwiched between a tooth-shaped concave-convex of the wire slot cover and a tooth-shaped concave-convex of the U-shaped wire slot. It can be seen that in this patent application, the sensing optical fiber is arranged in the metal wire slot body, and the sensing optical fiber is mainly used for intrusion detection, and the sensing optical fiber can be protected and hidden by the metal wire slot body, so that the guardrail used in this mode comprises the metal wire slot body and also comprises the sensing optical fiber, the sensing optical fiber is not arranged in a segmented manner, the sensing optical fiber is mainly used for sensing vibration to identify the intrusion position, the accuracy of sensing and positioning is not high, and obviously the cost of the sensing and positioning is also high.
In the prior art, a Chinese patent 'fiber grating perimeter security system and method combined with strain information' (issued publication number is CN 105243772B) is also disclosed, in the invention, a detection optical cable is arranged on a fence, and a plurality of groups of sensors are connected in series on the detection optical cable, and the optical cable is used as a guardrail, and deformation generated by the optical cable is sensed by the sensors to detect the invasion condition. Because the sensor is connected in series with the optical cable, the problem that the protection effect of the whole optical cable is invalid when one optical cable is damaged or sheared exists, and the defect of high cost exists in the mode.
Disclosure of Invention
The invention mainly solves the technical problems of high monitoring and detecting cost, low reliability and high false alarm probability of the guardrail in the prior art.
In order to solve the technical problems, the technical scheme adopted by the invention is to provide the stress detection guardrail, which comprises a plurality of control rods with the same structure, wherein at least one steel wire cable is arranged between any two control rods in parallel, an induction spring piece is vertically arranged in a shell of the control rod, a fiber bragg grating sensor is arranged on the induction spring piece, one end of the steel wire cable is fixed on a first control rod in any two control rods, the other end of the steel wire cable penetrates through the induction spring piece in a second control rod in any two control rods and is further connected to one end of a spring, the other end of the spring is fixed on a spring fixing seat in the second control rod, after the steel wire cable is tensioned between the two control rods, the steel wire cable is fixedly connected with the induction spring piece through a wire fixing device, and the fiber bragg grating sensor is connected to a fiber bragg grating demodulator through an optical cable.
In another embodiment of the stress detection guardrail of the invention, at least one tightener corresponding to the steel wire cable is arranged outside the shell of the control rod, and one end of the steel wire cable is fixed on the tightener of the first control rod in the two arbitrary control rods.
In another embodiment of the stress detection guardrail, a limiter is further arranged in the shell of the control rod, the steel wire cable passes through the sensing elastic sheet and then is connected with one end of the spring through the limiter, and the spring is vertically arranged and stretches or retracts in the vertical direction.
In another embodiment of the stress detection guardrail of the invention, the sensing elastic piece is fixed between the upper bottom plate and the lower bottom plate of the shell of the control rod through the clamping plate, and the sensing elastic piece keeps a vertical state without elastic deformation after the steel wire cable is tensioned between the two control rods.
In another embodiment of the stress detection guardrail of the invention, at least one support rod for supporting the steel wire cable is also arranged between any two control rods.
In another embodiment of the stress detection guardrail, at least one cable limiter for correspondingly supporting the steel wire cable is vertically arranged on the supporting rod, and the height of the cable limiter is matched with the height of the wire tightener.
In another embodiment of the stress detection guardrail, the bottoms of the control rod and the support rod are respectively provided with a metal base, the metal bases comprise vertical side surfaces and horizontal bottom surfaces, and nut fixing holes are respectively formed in the vertical side surfaces and the horizontal bottom surfaces.
In another embodiment of the stress detection guardrail, the side wall of the shell of the control rod is also provided with a miniature camera, and/or the control rod is also provided with an audible and visual alarm.
In another embodiment of the stress detection guardrail of the invention, the fiber bragg grating demodulator detects the demodulated signal and includes a pulling step signal corresponding to the pulled steel wire cable, and the effectiveness of the pulling step signal is judged by setting a pulling detection threshold.
In another embodiment of the stress detection guardrail, the fiber bragg grating demodulator detects that the demodulated signal comprises a shearing step signal corresponding to the sheared steel wire cable, and the effectiveness of the shearing step signal is judged by setting a shearing detection threshold.
The beneficial effects of the invention are as follows: the invention discloses a stress detection guardrail, which comprises a plurality of control rods with the same structure, wherein at least one steel wire cable is arranged between any two control rods in parallel, an induction spring piece is vertically arranged in a shell of the control rod, a fiber bragg grating sensor is arranged at the bottom of the induction spring piece, one end of the steel wire cable is fixed on a first control rod in any two control rods, the other end of the steel wire cable passes through the induction spring piece in a second control rod and is further connected to one end of a spring, the other end of the spring is fixed on a spring fixing seat in the second control rod, and after the steel wire cable is tensioned between the two control rods, the steel wire cable is fixedly connected with the induction spring piece through a wire fixing device, and the fiber bragg grating sensor is connected to a fiber bragg grating demodulator through an optical cable. The fence has the advantages of reasonable structural design, lower realization cost, reliable detection and reduced false alarm detection.
Drawings
FIG. 1 is a schematic view of an embodiment of a stress detection guardrail according to the present invention;
FIG. 2 is a schematic view of a control rod assembly in accordance with another embodiment of the stress detection guardrail of the present invention;
FIG. 3 is a schematic view showing the composition of a support bar according to another embodiment of the stress detection guardrail of the present invention;
FIG. 4 is a schematic view of a base assembly of another embodiment of a stress detection guardrail according to the present invention;
FIG. 5 is a graph of a detection signal of a wire cable being lifted in accordance with another embodiment of the stress detection fence of the present invention;
fig. 6 is a graph of a detection signal of a cut of a wire cable of another embodiment of the stress detection fence according to the present invention.
Detailed Description
In order that the invention may be readily understood, a more particular description thereof will be rendered by reference to specific embodiments that are illustrated in the appended drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used in this specification includes any and all combinations of one or more of the associated listed items.
Fig. 1 to 3 show a schematic view of an embodiment of the stress detection fence according to the present invention, in which:
1: control lever, 2: support bar, 3: steel wire cable, 11: first lever, 12: second lever, 13: sensing shrapnel, 14: fiber bragg grating sensor, 15: spring, 16: spring holder, 17: housing, 18: wire holder, 19: stopper, 20: tightener, 21: base, 22: cable limiter, 31: optical cable, 32: a demodulator.
As shown in fig. 1 and 2, in this embodiment of the stress detection guardrail, a plurality of control rods 1 with the same structural composition are included, at least one steel wire cable 3 is erected in parallel between any two control rods 1, an induction shrapnel 13 is vertically arranged in a shell 17 of each control rod 1, a fiber bragg grating sensor 14 is arranged on each induction shrapnel 13, the fiber bragg grating sensor 14 is connected to a demodulator 32 through an optical cable 31, one end of each steel wire cable 3 is fixed on a first control rod 11 in any two control rods 1, the other end of each steel wire cable 3 passes through each induction shrapnel 13 in a second control rod 12 in any two control rods 1, and is further connected to one end of a spring 15, the other end of each spring 15 is fixed on a spring fixing seat 16 in the second control rod 12, and after the steel wire cable 3 is tensioned between the two control rods 1, the steel wire cable 3 is fixedly connected with the induction shrapnel 13 through a wire fixing device 18.
It can be seen that in this embodiment, the control rods are independent, so that the wire cable between any two control rods will not interfere with and affect each other during monitoring, and even if the wire cable between two control rods is damaged or sheared, the wire cable between other two control rods will not affect monitoring. Of course, in this embodiment, for any one control lever, both the second control lever that is the former group of control levers and the first control lever that is the latter group of control levers, there is a dual effect, so that the internal composition and the external structure of each control lever in this embodiment are the same, have the same specifications, and thus are convenient for replacement use and mass production. In addition, the demodulator can monitor the steel wire cables among a plurality of control rods through the optical cable, and power supply is only needed to be supplied to the demodulator, so that the demodulator has the advantage of low energy consumption.
Preferably, the distance between any two control rods can be set reasonably according to the accuracy requirement of monitoring, for example, the distance is in the range of 1 meter to 10 meters. The distance between any two control rods thus also determines the monitoring accuracy, so that the accuracy of this embodiment is adjustable, and in practical applications, the distance can be arranged differently at different monitoring positions, for example at a distance of 1 meter, at a distance of 5, and at a distance of 10 meters.
Preferably, the length of the fiber bragg grating sensor 14 is generally smaller than or equal to the length of the sensing spring 13, and the fiber bragg grating sensor is arranged on the sensing spring 13 for mainly detecting deformation of the sensing spring, wherein the deformation of the sensing spring mainly originates from tensile deformation of the steel wire cable, that is, when the steel wire cable is stirred, lifted and sheared, the force is acted on the sensing spring, so that the sensing spring is deformed, and the deformation is detected by the fiber bragg grating sensor. Therefore, the fiber bragg grating sensor can be arranged at the lower part, the upper part or the middle part of the sensing spring plate, for example, the fiber bragg grating sensor is preferably arranged at the middle part, and when a plurality of steel wire cables exist, the fiber bragg grating sensor is favorable for further accurately detecting which steel wire cable is subjected to external acting force to cause deformation of the sensing spring plate.
The fiber grating sensor 14 is connected to a demodulator through an optical cable, and the demodulator generates an optical signal to be applied to the fiber grating sensor 14 through the optical cable. Preferably, the fiber grating sensor 14 is a fiber Bragg grating (Fiber Bragg Grating, abbreviated as FBG). The fiber grating sensor utilizes the photosensitive characteristic of the fiber material (the interaction of external incident photons and germanium ions in the fiber core forms permanent change of refractive index), and forms a space phase grating in the fiber core, so as to change and control the propagation behavior of light in the fiber core. The refractive index of the optical fiber is in fixed periodic modulation distribution along the axial direction of the optical fiber, is a uniform grating, and has good wavelength selectivity. When broadband light enters the optical fiber, the incident light meeting the specific condition wavelength is coupled and reflected at the grating, the light with the other wavelengths can completely pass through without being affected, and the reflection spectrum has a peak value at the center wavelength lambda B of the FBG. Preferably, the center wavelength λ B satisfies:
λB＝2neffΛ
Wherein lambda B is the center wavelength of the reflected light; n eff is the effective refractive index of the core in the sensor; Λ is the spatial period of the refractive index modulation of the fiber grating. External stress causes a change in refractive index and pitch, resulting in a shift of the wavelength lambda B, satisfying the following linear relationship:
Wherein, deltalambda is the wavelength variation, epsilon is the strain of the optical fiber in the sensor after the axial direction of the optical fiber receives the external force, deltaT is the temperature variation, P e is the photoelastic coefficient of the optical fiber in the sensor, alpha is the thermal expansion coefficient of the optical fiber in the sensor, and zeta is the thermal optical coefficient of the optical fiber.
In this embodiment, the acting force applied to the steel wire cable is converted into deformation of the sensing spring plate, and the deformation is detected by the fiber grating sensor 14 and reflected to the change of the center wavelength, and the change of the center wavelength can be demodulated and detected by the demodulator.
Preferably, at least one tightener 20 corresponding to the steel wire cable 3 is vertically disposed outside the housing 17 of the control lever 1, and one end of the steel wire cable 3 is fixed to the tightener 20 of the first control lever 11 of the two control levers 1.
Preferably, at least one support rod 2 for supporting the steel wire cable 3 is further provided between any two control rods 1.
Preferably, at least one cable limiter 22 for supporting the steel wire cable 3 is vertically disposed on the support rod 2, and the height of the cable limiter 22 is adapted to the height of the tightener 20.
Preferably, a limiter 19 is further disposed in the housing 17 of the control rod 1, and the steel wire cable 3 passes through the sensing spring piece 13 and then is connected with one end of the spring 15 through the limiter 19, where the spring 15 is vertically disposed and stretches or retracts along a vertical direction. The transverse stretching of the steel wire cable is converted into the vertical stretching of the spring, so that the space in the shell can be reasonably utilized, and the shell does not need to have a wider width along the transverse direction.
Preferably, the sensing spring 13 is fixed between the upper bottom plate and the lower bottom plate of the housing 17 of the control rod 1 through a clamping plate, and when the steel wire cable 3 is tensioned between the two control rods 1, the sensing spring 13 does not elastically deform.
Preferably, the control rod 1 and the bottom of the support rod 2 are both provided with a metal base 21, the metal base comprises a vertical side surface and a horizontal bottom surface, the vertical side surface is provided with a nut fixing hole, and therefore the control rod is fixedly connected with a shell of the control rod through a bolt, and the horizontal bottom surface is also provided with a nut fixing hole, and therefore the control rod is fixedly connected with the ground or a wall through the bolt.
It is further preferred that the vertical side 41 of the metal base is provided with a vertical hole 411 and the horizontal bottom 42 is provided with a horizontal hole 421, and for the vertical hole 411, a plurality of circumferential holes 4111 arranged circumferentially and a center hole 4112 arranged at the center of the circumference are included. In a specific use, the corresponding circumferential holes 4111 can be reasonably selected from the vertical holes 411 according to different application scenarios, for example, when the control rod is required to be completely vertical to the ground, the central hole 4112 and the two circumferential holes 4111 in the vertical direction are fixedly connected with the shell of the control rod, and when the control rod is required to have an inclination angle with the ground, the central hole 4112 and the two circumferential holes 4111 in the vertical direction with corresponding angles are fixedly connected with the shell of the control rod.
Preferably, the shell of the control rod is made of stainless steel with the thickness of 1.5mm, so that the strength is improved. The sensing spring piece 13 is a metal plate with the thickness being greater than or equal to 1.5mm, the diameter of the steel wire cable 3 is 1.5mm, and the length of the spring 15 is 50mm, the wire diameter is 2.0mm and the outer diameter is 20mm. The base is designed to be an adjustable angle and is made of 2.5mm stainless steel. The supporting rod adopts 1.5mm aluminum alloy with the diameter of 24mm.
Preferably, when the fiber bragg grating sensor is installed and used, the fiber bragg grating sensor 14 is fixed at the bottom of the sensing spring piece 13 of the control rod in the early stage, the follow-up installation is not affected, then the sensing spring piece is fixed on the upper bottom plate and the lower bottom plate of the shell 17 of the control rod 1 through the clamping plates, the steel wire cable 3 is in a vertical state, penetrates through the holes of the shell, the sensing spring piece and the wire fixing device, and is linked to the spring through the limiter, and the other end of the spring is fixed on the spring fixing seat. The base of the control rod is fixed on a wall or the ground by using an expansion bolt, the shell is connected to the fixed base, the angle is adjusted, the supporting rod is fixed by using the same method, then the steel wire cable passes through the cable limiter of the supporting rod until being connected to the first control rod, at the moment, the steel wire cable is connected to the wire tightener by the hole site, and then the wire tightener is fixed on the first control rod shell by using a screw nut, and at the moment, the steel wire is still in a loose state. Then using a spanner to rotate a wire tightening device on the wire tightener, controlling the force used in the locking state (a large amount of experiments prove that a fixed force application value is obtained, so that the steel wire cable is in a tightening state, and meanwhile, the displacement of a spring is fixed, so that when the steel wire cable is invaded, the set signal parameter value is controllable), using the same mode to debug other parallel steel wire cables, and then directly clamping the wire fixer on the middle elastic sheet and the steel wire cable through the locking device, wherein the steel wire cable is in a balance state.
After the installation is completed, the fiber bragg grating sensor is connected to a fiber bragg grating demodulator through an optical cable, and the demodulator is electrified and connected to a background control system.
And (3) starting a background control system, reading and identifying signals acquired by the current fiber bragg grating, inputting preset variable values obtained by a large number of experiments in the early stage into the system, performing on-site experiment debugging, modifying the parameter values, and completing the whole guardrail system after all the systems and the values are debugged. When foreign matter invades, a steel wire cable is pulled, an induction spring plate is pulled by the steel wire cable, the induction spring plate is deformed, a fiber bragg grating sensor on the spring plate can instantly collect deformation signals and send the deformation signals to a demodulator, the demodulator collects the deformation signals to a background control system, the demodulator compares the change signal values with preset values after debugging, if the change values reach or exceed the preset values, personnel invasion is considered, and the background starts to give an alarm; if the change signal is smaller than the preset value, no personnel invade, and the method can effectively shield some false signals, such as animals like cats and birds, and the deformation of the steel wire cable caused by plant stems like heavy rain, heavy wind, branches and the like, so that the monitoring accuracy can be improved.
And establishing a corresponding detection sensing mode for the external invasion condition. Preferably, when the steel wire cable is pulled and lifted, an intruder or a foreign matter exceeding a certain weight presses or pulls the steel wire cable, the sensing spring sheet in the pulling control rod deforms, the deformation mode is a step signal shown in fig. 5, and the duration is the action time of the intruder or the foreign matter on the steel wire cable, for example, the common action time exceeds 1s. Personnel invade and leave or animal touches and pulls the cable and leave, and the spring can pull the steel wire cable and the response shell fragment back to former state, makes the system resume original equilibrium. Thus, the left end of the step signal shown in fig. 5 represents the state in which the steel wire cable is not pulled, and when pulled, a portal-shaped step signal is formed, the amplitude of which represents the amplitude of the pulled steel wire cable, and when the pulling operation is finished, the step signal is restored, thus representing the state in which the steel wire cable is at the right end of the step signal.
In fig. 5, the abscissa shows the time, and the ordinate shows the wavelength change detected by the fiber grating sensor, so that it can be seen that after a certain steel wire cable connected with the sensing spring is pulled, the wavelength change is converted into a step signal, and the step amplitude of the step signal and the amplitude of the pulled steel wire cable are in a linear relation, so that a threshold value of the step amplitude can be set, effective identification alarm can be performed only when the amplitude value of the step signal is equal to or greater than the threshold value, and an ineffective signal can be considered when the amplitude value of the step signal is less than the threshold value, and the alarm can be filtered without being performed.
Therefore, preferably, the fiber bragg grating demodulator detects that the demodulated signal includes a pulling step signal corresponding to the pulled steel wire cable, and the validity of the pulling step signal is judged by setting a pulling detection threshold.
Further preferably, a miniature monitoring camera, such as a monitoring camera used in a mobile phone, is arranged on the side wall of the shell of the control rod, namely the side wall of the opposite steel wire cable, and the camera has the characteristics of small size, low power consumption and wide view field, and is also convenient to conceal and install on the side wall of the shell. And in general, the monitoring camera does not start up, but triggers the camera to start up when the fiber bragg grating demodulator detects that the demodulated pulling step signal is greater than or equal to the pulling detection threshold, so as to photograph or record the monitored scene. In addition, an audible and visual alarm can be arranged on the control rod, and the audible and visual alarm does not work normally, but triggers the audible and visual alarm to work when the fiber bragg grating demodulator detects that the demodulated pulling step signal is greater than or equal to the pulling detection threshold, thereby realizing the deterrence of audible and visual alarm and reducing and avoiding invasion.
Preferably, since there is at least one steel wire cable connected with the sensing spring, it is necessary to measure step signals corresponding to different pulling forces and pulling forces of each cable separately, and store the step signal data, thereby being able to be used as monitoring data for the basis of the later comparative analysis. In addition, when at least one steel wire cable is simultaneously pulled, a step signal data model generated after the at least one steel wire cable is simultaneously pulled is also established according to an intrusion behavior mode and stored in a monitoring model database for later monitoring analysis.
Therefore, in the invention, the behavior of pulling the steel wire cable aiming at the disturbance guardrail is set with the change threshold according to the deformation size, and the deformation with lower magnitude is filtered, for example, the guardrail stress detection change caused by the standing of birds on the steel wire cable can be filtered because the alarm threshold is not reached, thereby effectively filtering the tiny disturbance behaviors such as branches, birds, wind and rain and the like which do not need to be alarmed, and reducing the false alarm rate of the system.
Preferably, when the steel wire cable is cut, when an intruder uses the cut steel wire cable to intrude, the sensing spring plate can rebound reversely, the built-in grating sensor detects continuous stress change, the change is step change and irreversible after the steel wire cable is disconnected, and the cutting test signal is shown in fig. 6.
In the embodiment shown in fig. 6, the monitoring signal change chart of the cut 4 steel wire cables includes a step signal A1 of the cut first steel wire cable, a step signal A2 of the cut second steel wire cable, a step signal A3 of the cut third steel wire cable and a step signal A4 of the cut fourth steel wire cable. The amplitude changes of the step signals directly reflect the state that the corresponding steel wire cable is sheared. And it can be seen that the amplitude of the step signal will remain after each cut of one wire cable without returning to the corresponding signal state before cutting, which is a distinct difference from pulling the wire cable.
Step signal data of a single steel wire cable cut can be established and stored, and in actual detection, the step signal data can be compared with the stored step signal data according to the characteristic of step signal change, so that the condition that the steel wire cable is cut is judged. Therefore, preferably, the fiber bragg grating demodulator detects that the demodulated signal includes a shearing step signal corresponding to the sheared steel wire cable, and the validity of the shearing step signal is judged by setting a shearing detection threshold.
Preferably, the start-up operation of the micro monitoring camera and the audible and visual alarm is also suitable for detecting the shearing step signal, namely, when the shearing step signal detected and demodulated by the fiber bragg grating demodulator is greater than or equal to the shearing detection threshold, the start-up operation of the micro monitoring camera and the audible and visual alarm is triggered.
According to the invention, aiming at the behavior of cutting the steel wire cable, the change threshold is set according to the deformation size of the induction spring plate, the loosening deformation with lower magnitude is filtered, for example, the rail stress detection change caused by thermal expansion and cold contraction of the steel wire cable can be filtered because the rail stress detection change can not reach the alarm threshold, thereby effectively filtering the behavior which does not need to be alarm, such as strain change, caused by slow change of natural environment, and reducing the false alarm rate of the system.
If personnel cut off the cable invasion, or have foreign matter such as branch, the spring of connecting the steel wire cable can stimulate steel wire cable and response shell fragment, makes the response shell fragment be in a invariable deformation state always, and fiber bragg grating sensor can the real-time recording signal this moment, and a invariable signal variation value is given to the demodulator, and the demodulator can carry out the early warning suggestion according to this state, and whether personnel invade or branch hang and press according to the size of signal variation, and when background system had the shearing cable of predetermineeing, shell fragment deformation signal variation.
Preferably, the stress detection guardrail is paved around a building needing security protection, one control rod is installed every 10 meters to 30 meters, and a plurality of support rods are arranged between every two control rods and used for erecting support steel wire cables.
Preferably, the control rod is 600mm in height, four groups of steel wire cables are arranged from top to bottom, the steel wire cables are connected with the sensing elastic sheet and the spring, and after the installation is finished, the tension of the steel wire cables and the tension of the spring are in a balanced state, and the steel wire elastic sheet basically keeps a vertical state of a non-deformation pair.
Each control rod is provided with a set of optical fiber monitoring systems and signal analysis systems, and each set of signal analysis systems is linked to the background overall control system for signal analysis and monitoring. After all the systems are installed, starting a background total control system, starting perimeter safety real-time monitoring, recording an induction spring sheet deformation quantity signal by the system at the moment, taking the induction spring sheet deformation quantity signal as an initial standard parameter signal, and setting a signal change value which is judged to be shown by personnel invasion according to a large number of experimental results in the earlier stage.
When personnel invade, pulling steel wire cable, the one end of connecting spring has the displacement, and the simultaneous pulling response shell fragment causes vertical shell fragment to have certain bending originally, loosens the back, and the pulling force of spring can be with cable and response shell fragment pull back former state, keeps balanced, and fix the fiber bragg grating sensor on the response shell fragment and can record the signal in the twinkling of an eye, analysis signal variation quantity compares with the default to judge whether personnel invade. In addition, if someone cuts steel wire cable and invades, because the cable cuts, receives spring pulling force effect, and the cable is reverse to be removed, pulls middle shell fragment reverse deformation, and the sensor on the shell fragment can record deformation signal information in the twinkling of an eye this moment, transmits to demodulator and backstage master exchange, carries out analysis, compares, judges to have the condition that personnel invaded, judges invading personnel's position according to the serial number of transmission signal's analytic system simultaneously. In addition, compared with the condition that the sensor is directly arranged on the cable, the invention can effectively filter interference information, such as animal pulling cable, plant supporting rod falling off, heavy wind and rain, and the like. The monitoring efficiency can be improved, and false alarms are reduced.
Therefore, the invention discloses a stress detection guardrail, which comprises a plurality of control rods with the same structure, wherein at least one steel wire cable is arranged between any two control rods in parallel, an induction spring piece is vertically arranged in a shell of the control rod, a fiber bragg grating sensor is arranged at the bottom of the induction spring piece, one end of the steel wire cable is fixed on a first control rod in any two control rods, the other end of the steel wire cable penetrates through the induction spring piece in the second control rod and is further connected to one end of a spring, the other end of the spring is fixed on a spring fixing seat in the second control rod, and after the steel wire cable is tensioned between the two control rods, the steel wire cable is fixedly connected with the induction spring piece through a wire fixing device, and the fiber bragg grating sensor is connected to a fiber bragg grating demodulator through an optical cable. The fence has the advantages of reasonable structural design, lower realization cost, reliable detection and reduced false alarm detection.
The foregoing is only illustrative of the present invention and is not to be construed as limiting the scope of the invention, and all equivalent structural changes made by the present invention and the accompanying drawings, or direct or indirect application in other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The utility model provides a stress detection guardrail, its characterized in that includes the same control rod of a plurality of structure composition, has set up at least one steel wire cable in parallel between arbitrary two control rods, the inside of the casing of control rod is vertical to be provided with the response shell fragment, the response shell fragment passes through splint to be fixed between the upper plate and the lower plate of the casing of control rod, be provided with fiber bragg grating sensor on the response shell fragment, the one end of steel wire cable is fixed the first control rod in arbitrary two control rods, the other end passes in the second control rod in arbitrary two control rods the response shell fragment to further be connected to one end of a spring, the other end of spring is fixed on the spring fixing base in the second control rod, works as the steel wire cable is taut back between two control rods, the steel wire cable pass through the solidus ware with response shell fragment fixed connection, fiber bragg grating sensor set up in the lower part, upper portion or the middle part of response shell fragment, when many steel wire cable's one can be detected which the response cable receives the optical fiber bragg grating and the optical cable receives the external force and the fiber bragg grating takes place and the optical cable is connected to the deformation.
2. The stress detection fence of claim 1, wherein at least one tightener corresponding to the wire cable is provided outside the housing of the control lever, and one end of the wire cable is fixed to the tightener of the first control lever of the any two control levers.
3. The stress detection guardrail according to claim 1 or 2, wherein a limiter is further arranged inside the shell of the control rod, the steel wire cable passes through the sensing elastic sheet and then is connected with one end of the spring through the limiter, and the spring is vertically arranged and stretches or retracts in the vertical direction.
4. A stress-detecting fence according to claim 3 wherein said sensing dome remains in a vertical condition without elastic deformation after said steel wire cable is tensioned between two control rods.
5. The stress-detecting fence of claim 2, wherein at least one support bar for supporting the wire cable is further provided between any two control bars.
6. The stress detection fence of claim 5, wherein at least one cable limiter is vertically disposed on the support bar that corresponds to supporting the steel wire cable, and wherein the height of the cable limiter is adapted to the height of the tightener.
7. The stress detection guardrail of claim 5 or 6, wherein the control rod and the support rod bottom are each provided with a metal base comprising a vertical side and a horizontal bottom, each provided with a nut securing hole.
8. The stress detection guardrail of claim 7, further comprising a miniature camera on a side wall of the housing of the control rod and/or an audible and visual alarm on the control rod.
9. The stress detection guardrail according to claim 1, wherein the fiber bragg grating demodulator detects a pulling step signal corresponding to a demodulated signal including a pulled steel wire cable, and the effectiveness of the pulling step signal is judged by setting a pulling detection threshold.
10. The stress detection guardrail according to claim 1, wherein the fiber bragg grating demodulator detects that the demodulated signal comprises a shearing step signal corresponding to the sheared steel wire cable, and the effectiveness of the shearing step signal is judged by setting a shearing detection threshold.
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| CN110992619A (en) * | 2019-11-22 | 2020-04-10 | 郑州祥和集团有限公司 | Electric power tunnel anti-intrusion device and detection method thereof |
| CN112595446B (en) * | 2021-03-02 | 2021-05-28 | 南京派光智慧感知信息技术有限公司 | Stress detection protective fence |
| CN115560894B (en) * | 2022-08-24 | 2023-08-11 | 江苏智纤科技有限公司 | Carbon fiber flexible pressure distributed sensing device |
| CN116311716A (en) * | 2022-12-27 | 2023-06-23 | 江苏兴力工程管理有限公司新兴分公司 | Electronic power grid fence system based on intelligent strain type and guard method |
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