Damage Detection System

Abstract

1. A damage detection system for monitoring a magnetized structure for damage, comprising: a magnetometer; and a controller configured to receive a first magnetic field signal of the magnetized structure from the magnetometer, receive a second magnetic field signal of the magnetized structure from the magnetometer, determine magnetic field displacement data based on the second magnetic field signal and the first magnetic field signal, and determine a state of the magnetized structure based on the magnetic field displacement data.

Description

[Technical field]

[0001] The present disclosure relates to a damage detection system and method for detecting damage in a magnetized structure. Summary of the Invention

[0002] According to a first aspect of the present disclosure, there is provided a damage detection system for monitoring a magnetized structure for damage, the damage detection system comprising: A safety structure comprising: a magnetization structure, the magnetization structure including a ferromagnetic material and generating its own magnetic field; a safety structure comprising a magnetometer; A controller, receiving a first magnetic field signal of the magnetized structure from a magnetometer; receiving a second magnetic field signal of the magnetized structure from the magnetometer; determining magnetic field displacement data based on the second magnetic field signal and the first magnetic field signal; A controller configured to determine a state of the magnetization structure based on the magnetic field displacement data.

[0003] Damage detection systems are advantageously able to monitor the condition of structures susceptible to damage and detect damage that may otherwise go unnoticed or undetected.

[0004] The controller may be configured to determine the magnetic field displacement data based on a difference or ratio between the first magnetic field signal and the second magnetic field signal along one or more axes.

[0005] The magnetic field displacement data may include magnetic field displacement along one or more axes.

[0006] The controller may be further configured to receive a plurality of further magnetic field signals and determine magnetic field displacement data based on the further magnetic field signals.

[0007] The controller can be configured to determine a state of the magnetization structure based on a magnitude of the magnetic field displacement in one or more axes.

[0008] The controller may be configured to determine the state of the magnetization structure by comparing the magnitude of the magnetic field displacement in one or more axes to one or more state thresholds.

[0009] The state of the magnetization structure is the level of damage to the magnetized structure, and / or It may include an assembled state of the magnetization structure.

[0010] The controller can be configured to receive the first magnetic field signal as a calibration magnetic field signal as part of a calibration routine. The controller can perform the calibration routine at any time, including during manufacture, installation, assembly, reassembly, service, repair, and / or relocation.

[0011] The controller may be configured to update the first magnetic field signal based on the second magnetic field signal.

[0012] The controller may be configured to output a status signal indicative of the status of the magnetization structure.

[0013] The damage detection system may further comprise an audible and / or visual indicator. The controller may be configured to output the status signal by activating the audible and / or visual indicator.

[0014] The controller may be configured to output a status signal by transmitting the status data and / or the magnetic field displacement data to an external controller.

[0015] The controller may be co-located with the magnetometer. The controller may be coupled to the magnetometer via a network. The controller may comprise multiple processors distributed between being co-located with the magnetometer or coupled to the magnetometer via a network.

[0016] The controller is Receive a trigger signal; selectively activating the magnetometer in response to the trigger signaling; It may be further configured to receive a magnetic field from a magnetometer.

[0017] The trigger signaling may include a periodic trigger signal to selectively activate the magnetometer to receive the magnetic field according to a monitoring schedule.

[0018] The trigger signaling may include an on-demand signal from a trigger sensor. The movement of objects within a given radius of the magnetometer, and / or It is capable of responding to a collision between an object and a magnetized structure.

[0019] The damage detection system may include a trigger sensor.

[0020] The trigger sensor may comprise an optical sensor. The trigger sensor may comprise a mechanical sensor. The trigger sensor may comprise a vibration sensor or a shock sensor. The trigger sensor may comprise an accelerometer. The trigger sensor may comprise a receiver.

[0021] The controller is Receives on-demand magnetic field signals from a magnetometer; determining magnetic field displacement data based on the on-demand magnetic field signal and the first reference magnetic field signal; The device may be further configured to determine whether the object is a vehicle in response to the magnetic field displacement data exceeding one or more displacement thresholds.

[0022] The damage detection system may further comprise an output signal generator, and the controller may be configured to activate the output signal generator in response to the magnetic field displacement data exceeding one or more displacement thresholds.

[0023] The controller is receiving a plurality of on-demand magnetic field signals from a magnetometer; determining transient magnetic field displacement data including a plurality of magnetic field displacements corresponding to a difference or ratio between the corresponding on-demand magnetic field signal and the first magnetic field signal; Based on the transient magnetic field displacement data, it may be configured to determine any of the position, speed, velocity, trajectory, or presence of an object, or a transient damage profile of a magnetized structure.

[0024] The controller is receiving a first auxiliary magnetic field signal and a second auxiliary magnetic field signal from a second magnetometer monitoring the magnetized structure; determining auxiliary magnetic field displacement data of the magnetization structure based on the first auxiliary magnetic field signal and the second auxiliary magnetic field signal; It may be further configured to determine a location of damage on the magnetized structure based on a comparison between the magnetic field displacement data and the auxiliary magnetic field displacement data.

[0025] The damage detection system may include one or more magnetic elements for magnetizing the structure. The magnetic elements may include any of a magnetic strip, a magnetic plate, a magnetic tape, magnetic particles, and / or magnetic paint.

[0026] At least the magnetometer may be positioned within a safety structure, which may comprise a safety barrier, a safety bollard, a safety rail, a post for a safety rail, a crash sensor, or any of their components.

[0027] The damage detection system is a plurality of magnetometers, each magnetometer coupled to a corresponding transceiver; and a server configured to communicate with each of the plurality of magnetometers via a corresponding transceiver.

[0028] The server may include a controller.

[0029] The damage detection system may further include a plurality of controllers, each configured to receive the reference magnetic field and the measurement magnetic field from a corresponding magnetometer.

[0030] A safety structure may comprise a structure for protecting or isolating property or pedestrians from vehicles, or a structure for protecting or isolating pedestrians from a hazardous area.

[0031] The safety structure may comprise a safety barrier, a safety bollard, a safety rail, a post for a safety rail, a bumper, a crash sensor, a rack, a guard, a machine guard, machine fencing, a combination thereof, or any of the component parts thereof.

[0032] The magnetised structure may include any of a safety barrier, a safety bollard, a safety rail, a post for a safety rail, a bumper, a rack, a guard, a machine guard or machine fencing.

[0033] The magnetizing structure may comprise a polymeric safety structure and one or more magnetic elements for magnetizing the polymeric safety structure.

[0034] The one or more magnetic elements Lining of magnetic material on polymer safety structure, Injection of magnetic material into the polymer safety structure; Magnetic material embedded in a secure polymer construction, Magnetic strips, magnetic plates, magnetic tapes, magnetic particles, and / or It may include one or more of the magnetic paints fixed to the polymeric safety structure.

[0035] The polymeric safety structure may include any of a safety barrier, a safety bollard, a safety rail, a post for a safety rail, a bumper, a rack, a guard, a machine guard, or machine fencing. The polymeric safety structure may include a structure for protecting or isolating property and / or pedestrians from vehicles, or a structure for protecting or isolating pedestrians from a hazardous area.

[0036] According to a second aspect of the present disclosure, there is provided a magnetised safety structure comprising any of the damage detection systems disclosed herein, the safety structure comprising a safety barrier, a safety bollard, a safety rail, a post for a safety rail, a crash sensor, or any of their components.

[0037] According to a third aspect of the present disclosure, there is provided a magnetized safety barrier system, the magnetized safety barrier system comprising: Any of the damage detection systems disclosed herein; A second magnetometer; and a magnetized safety barrier; A magnetometer is associated with a first end of the magnetic safety barrier and a second magnetometer is associated with a second end of the magnetic safety barrier.

[0038] Magnetized safety barriers are A safety barrier; a wire extending along an axis of the safety barrier through the opening; and a plurality of magnetic elements attached to the wire and spaced along the length of the wire.

[0039] The wire may be held under tension and the magnetic elements may be spaced periodically along the length of the wire.

[0040] The first and second magnetometers may be coupled to respective first and second support structures at respective ends of the magnetized safety barrier.

[0041] The controller is receiving a plurality of further magnetic field signals from the magnetometer; receiving a plurality of further auxiliary magnetic field signals from a second magnetometer; determining first dynamic magnetic field displacement data based on a difference between each of the further magnetic field signals and the first magnetic field signal; determining auxiliary dynamic magnetic field displacement data based on a difference between each of the auxiliary magnetic field signals and the first auxiliary magnetic field signal; The impact force may be determined based on the vibration parameters of the first dynamic magnetic field displacement data and / or the auxiliary dynamic magnetic field displacement data.

[0042] According to a fourth aspect of the present disclosure, there is provided a network system comprising a server connected to any of a plurality of damage detection systems disclosed herein or connected to any of a plurality of safety structures disclosed herein.

[0043] According to a fifth aspect of the present disclosure, there is provided a method of installing any of the damage detection systems disclosed herein, the method comprising: applying a magnetic element to the structure to provide a magnetized structure; and coupling the damage detection system to the magnetized structure.

[0044] According to a sixth aspect of the present disclosure, there is provided a computer-implemented method for monitoring a magnetization structure for damage, the computer-implemented method comprising: receiving a first reference magnetic field of the magnetized structure from a magnetometer positioned to monitor the magnetized structure; receiving a second reference magnetic field of the magnetized structure from a magnetometer; determining magnetic field displacement data based on the second magnetic field reference and the first magnetic field reference; determining a state of the magnetization structure based on the magnetic field displacement data.

[0045] According to a further aspect of the present disclosure, there is provided a damage detection system for monitoring a magnetized structure for damage, the damage detection system comprising: A magnetometer; and a controller, the controller comprising: receiving a first magnetic field signal of the magnetized structure from a magnetometer; receiving a second magnetic field signal of the magnetized structure from the magnetometer; determining magnetic field displacement data based on the second magnetic field signal and the first magnetic field signal; The state of the magnetization structure is determined based on the magnetic field displacement data.

[0046] One or more embodiments will now be described, by way of example only, with reference to the accompanying figures. [Brief description of the drawings]

[0047] [Figure 1] FIG. 1 shows a schematic diagram of a damage detection system for monitoring a magnetized structure according to an embodiment of the present disclosure. [Figure 2A] 1 shows a schematic diagram of a further damage detection system according to an embodiment of the present disclosure. [Figure 2B] 1 shows a schematic diagram of yet another damage detection system according to an embodiment of the present disclosure. [Figure 3A] 1 illustrates an implementation of a damage detection system implemented within a safety structure at a first time according to one embodiment of the present disclosure. [Figure 3B] 3B illustrates an implementation of the damage detection system of FIG. 3A at a second time, according to one embodiment of the present disclosure. [Figure 3C] 3B illustrates an implementation of the damage detection system of FIG. 3A at a third time according to one embodiment of the present disclosure. [Figure 4] FIG. 1 illustrates a flow diagram of a method for monitoring magnetization structures for damage according to one embodiment of the present disclosure. [Diagram 5] 1 illustrates a flow diagram of a method for installing a damage detection system according to one embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0048] Many structures, e.g., bridges, buildings, and equipment, can pose safety hazards when damaged. One damage path is a vehicle collision with the structure. For example, in a factory or warehouse environment, a vehicle may be required to maneuver within a confined space and in close proximity to valuable goods and personnel. In a warehouse, a forklift truck (FLT) may pass between aisles of racks or shelves containing valuable inventory. The FLT may have to make sharp turns and maneuvers to load and unload inventory from the racks. Even an experienced driver can accidentally collide with a rack, causing damage and creating a potential safety hazard due to the rack collapsing, especially if the collision is not detected or reported.

[0049] Crash sensors on the structure can mitigate this risk by detecting and reporting collisions, but they can generate many false alarms for non-damaging collisions resulting from pedestrians sliding through the structure or other minor vibration events.

[0050] The damage detection systems disclosed herein may be suitable for use with any structure where it may be advantageous to monitor the structural integrity of the structure and / or collisions or impacts with the structure.

[0051] FIG. 1 shows a schematic diagram of a damage detection system 100 for monitoring a magnetized structure 118 according to an embodiment of the present disclosure. The damage detection system 100 (referred to herein as system 100) comprises a magnetometer 104 and a controller 106. The controller 106 is configured to receive magnetic field signals from the magnetometer 104. The magnetic field signals include (i) a first magnetic field signal associated with the magnetized structure providing a background or calibration reference magnetic field at a first time, and (ii) a second magnetic field signal associated with the magnetized structure providing a test magnetic field at a second time after the first time. The controller 106 determines magnetic field displacement data based on a difference between the second magnetic field signal and the first magnetic field signal. The controller 106 can then determine the state of the magnetized structure 118 when the magnetic field displacement data indicates a difference greater than a state threshold. In this example, the controller 106 can output the state of the magnetized structure 118 using an output signal generator 108.

[0052] The magnetized structure 118 should be understood to be a structure that includes a ferromagnetic material and generates its own magnetic field, such as a permanent magnet. In some examples, the magnetized structure 118 may be inherently magnetic. For example, the magnetized structure 118 may include ferromagnetic material and / or magnetic particles and undergo a magnetization process to form the magnetized structure 118. The structure may be lined or infused with a magnetic material. In other examples, a non-ferromagnetic structure may be magnetized by application of the magnetic element 119 to form the magnetized structure 118. For example, the magnetic element 119 may be applied or affixed to an aluminum or carbon composite safety structure. The magnetic element 119 may include any of a magnetic strip, a magnetic plate, a magnetic tape, magnetic particles, or a magnetic paint. The magnetic element 119 may be applied or affixed to the structure using an adhesive or mechanical fastening. In some examples, the magnetic element 119 may be applied to the ferromagnetic and / or magnetized structure to increase the strength of the magnetic field of the magnetized structure 118.

[0053] As an example, one or more magnetizing elements (referred to herein as magnetic elements) can be added to a polymeric safety structure to magnetize the (non-ferrous and non-metallic) polymeric safety structure. The polymeric safety structure (e.g., polyurethane safety structure) can provide a robust protective safety structure for warehouse and factory environments and can include safety barriers, safety bollards, safety rails, posts, bumpers, racks, guards, machine guards, machine fencing, or any other structure for protecting or isolating pedestrians and / or assets from vehicle strikes, or for protecting or isolating pedestrians from hazardous areas. The one or more magnetic elements may be added to the polymeric safety structure as a lining of magnetic material, embedment of magnetic material, or infusion of magnetic material. The one or more magnetic elements can include magnetic strips, magnetic plates, magnetic tapes, magnetic particles, and / or magnetic paint attached to or embedded in the polymeric safety structure. A specific example of magnetizing a safety structure in the form of a magnetized barrier system is described below. In this manner, non-ferrous and non-metallic safety structures can be magnetized and monitored for condition and damage.

[0054] The damage detection system 100 can advantageously monitor the condition of a structure susceptible to damage and detect damage that may otherwise go unnoticed or undetected. The damage detection system 100 can also advantageously complement a crash sensor system to determine whether a crash event is associated with damage to the monitored structure. The damage detection system 100 can also advantageously detect internal structural damage that may be invisible to an exterior inspection of the structure.

[0055] The magnetized structure 118 may be a structure that is susceptible to damage. The structure may be a fixed structure, for example, the system 100 may monitor magnetized posts, barriers, racks, walls, machine guards, machine fencing, etc. in a warehouse environment. The system 100 may also monitor bollards and barriers in outdoor environments such as construction sites, parking lots, or airports. The system 100 may monitor mobile magnetized structures 118, for example, sliding racks, sliding barriers, autonomous guided vehicles, mobile robots, or parts of vehicles.

[0056] In some examples, the controller 106 can be located near the magnetometer 104 within the housing 102. The housing 102 can provide the system 100 as a self-contained unit in which the housing 102 can be attached to the magnetizing structure 118 for monitoring. In other examples, the system 100 can be integrated into the magnetizing structure 118 or a subcomponent of the magnetizing structure 118, such as a safety post or a cap for a safety post. The housing 102 (or the safety structure) can have one or more input controls (not shown). For example, the one or more input controls can include one or more function buttons, touch screens, switches, etc. In response to actuation of the one or more input controls, the controller 106 can cause the magnetometer 104 to provide a first magnetic field signal or to perform a calibration routine (as described below) and / or to reset the system 100, for example by disabling the output signal generator 108.

[0057] In some examples, the controller 106 can be located remotely from the magnetometer, for example, outside the housing 102 and / or on a server. In such examples, the controller 106 can be coupled to the magnetometer 104 wirelessly and / or over a network. In some examples, the controller 106 can comprise multiple processors, with one or more processors located locally to the magnetometer 104 (e.g., within the housing 102) and one or more processors located remotely from the magnetometer 104 (e.g., outside the housing 102 or on a server). In other words, any functionality of the controller 106 described herein can be performed locally to the magnetometer 104 and / or remotely from the magnetometer. The system 100 and / or the controller 106 can include a transceiver for communicating with any remote processing device, such as a remote controller 106 or a server.

[0058] The controller 106 may receive the first magnetic field signal from the magnetometer 104 as a calibration reference magnetic field as part of a calibration routine. The calibration routine may be performed by the controller 106 at any time, including at the time of manufacture, installation, assembly, reassembly, service, and / or relocation. The magnetic field signal measured by the magnetometer 104 may include the magnetic field signal of the Earth in addition to the magnetic fields from the magnetized structure 118 and any other static magnetic objects in the vicinity of the system 100. Thus, the magnetic field signal may change depending on the location of the system 100. Thus, if the system 100 is relocated to a new location, a new first magnetic field signal may be received as part of the calibration routine.

[0059] The controller 106 receives the second magnetic field signal at a second time after receiving the first magnetic field signal. In this manner, the controller 106 can compare the second magnetic field signal to the first magnetic field signal to determine a change in state of the magnetized structure 118.

[0060] The magnetic field signals may include magnetic field measurements along one or more coordinate axes, or as absolute values ​​without axial resolution. The controller 106 may determine magnetic field displacement data ΔB based on a difference or ratio between the second magnetic field signal B2 and the first magnetic field signal B1 along one or more axes. For example, the magnetic field displacement data may be in the form: ΔBx,y,z=B2x,y,z-B1x,y,z Or, alternatively,

[0061]

number

[0062] The controller 106 can determine the state of the magnetized structure 118 by comparing the magnetic field displacement data ΔB to one or more condition thresholds. For example, the controller 106 can compare the magnitude of the magnetic field displacement data ΔB to one or more condition thresholds. Alternatively, or in addition, the controller 106 can compare the values ​​of the magnetic field displacement data along one or more or all of the axes to one or more corresponding axial condition thresholds.

[0063] The one or more condition thresholds may correspond to different states of the magnetized structure 118. For example, a condition threshold may correspond to a damage level of the magnetized structure 118. The controller 106 may then determine a damage level of the magnetized structure if the value of the magnetic displacement data exceeds a corresponding damage level condition threshold. The damage level may be qualitative, e.g., "mild," "moderate," "severe," or quantitative, with a numerical value based on the value of the magnetic displacement data and / or the exceeded condition threshold. A greater degree of damage may be associated with a higher value of the magnetic field displacement value, allowing the damage to be quantified. The one or more condition thresholds may also correspond to an assembly state of the magnetized structure 118. The controller 106 may determine an assembly state of the magnetized structure if the value of the magnetic displacement data exceeds a corresponding assembly state condition threshold. The assembly state condition threshold may be higher than the damage level threshold. For example, in the case of a system 100 monitoring a magnetized safety barrier, the magnetic displacement data has a greater magnitude if the barrier is removed rather than damaged. Thus, the assembly condition threshold may be higher than the damage threshold. The controller 106 can determine that the magnetization structure is intact and correctly assembled when the magnetic field displacement data values ​​are below all condition thresholds and / or below acceptable deviation thresholds.

[0064] The controller 106 can receive the multiple further magnetic field signals and determine the magnetic displacement data based on the further magnetic field signals. The controller 106 can determine the magnetic displacement data based on a difference between the further magnetic field signals and the first magnetic field signal.

[0065] The controller 106 may receive further magnetic field signals from the magnetometer 106 periodically during monitoring, e.g., according to a schedule, or otherwise on demand. As an example, the controller 106 may receive further magnetic field signals at regular time intervals, e.g., hourly, daily, weekly, etc. In this way, the controller 106 may monitor the state of the magnetized structure 118 at regular intervals. The controller 106 may receive further magnetic field signals when it is known that no vehicle is present (e.g., at night). In this way, the magnetic field signals of the magnetized structure 118 may be measured periodically to ensure that an undamaged and correctly assembled state is always obtained.

[0066] In some examples, the controller 106 can update or replace the first magnetic field signal with the second or further magnetic field signal if the difference between the two signals is below a difference threshold. In this way, drifts in the magnetometer 104, the sensitivity of the system 100, or the magnetization of the magnetization structure 118 do not accumulate and result in false alarms.

[0067] In this example, the system 100 further comprises an output signal generator 108, and the controller 106 can output a status signal indicative of the status of the magnetized structure 118. The output signal generator 108 can comprise an audible signal generator, such as a siren, or a visual signal generator, such as a display screen displaying a (flashing) light or a warning message. In this way, the output signal generator 108 can warn pedestrians and vehicle drivers of any potential danger resulting from damage or incorrect assembly of the magnetized structure 118. For example, a warning display can show a temporary vehicle speed limit or a no entry warning until the magnetized structure 118 is inspected and / or repaired. The controller 106 can activate the output signal generator 108 when the status of the magnetized structure corresponds to a level of damage or incorrect assembly.

[0068] The output signal generator 108 may comprise a transmitter configured to transmit the status signal and / or the magnetic field displacement data to an external device. For example, the transmitter may transmit the status signal to a remote server, a remote device and / or a mobile terminal. In this way, the system 100 can alert a user to the status of the magnetized structure 118 and can indicate a potential requirement for inspection and / or repair. The status signal may include a data signal including any of the magnetic field sensor signal, the magnetic field displacement data, and / or the status of the magnetized structure 118. Data from the status signal may also be stored locally or on a remote server for analysis. In this way, data can be captured for the sensor system 100 to indicate how many collision and / or disassembly events the magnetized structure 118 is exposed to, for example, daily, weekly, or monthly.

[0069] In the depicted example, the output signal generator 108 is shown within the housing 102. In other examples, the output signal generator 108 may be outside the housing 102 and may communicate with the controller 106 via wired or wireless means. For example, the output signal generator 108 may include an audible or visible signal generator located on a wall near the sensor system.

[0070] The system 100 may include a power source (not shown). When the system 100 is associated with a fixed magnetized structure 118, the power source may comprise a battery. The magnetometer may have high power consumption and may consume a non-negligible current. Thus, in one or more examples, the system 100 may be configured to operate in a sleep mode or an idle mode. The system 100 may operate in a sleep mode as a default state. In the sleep mode, the magnetometer 104 may be disabled to consume no power (or consume only a negligible amount). In the sleep mode, the controller 106 may also operate in a reduced state. For example, the controller 106 may perform only essential functions, such as listening for trigger signaling to wake the system from the sleep mode. In this manner, the system 100 operates in a sleep mode in which battery power is conserved.

[0071] The system 100 (or the controller 106) can receive trigger signaling to wake the system 100 from a sleep mode. The controller 106 can selectively activate the magnetometer 104 in response to the trigger signaling and receive a (second or further) magnetic field signal from the magnetometer 104. The trigger signaling can include a periodic trigger signal according to a monitoring schedule. For example, the controller 106 may activate the magnetometer and receive a further magnetic field signal at regular time intervals, e.g., hourly, daily, weekly, etc.

[0072] The system 100 can receive the trigger signaling as an on-demand signal from a trigger sensor. The trigger sensor can respond to the movement of an object within a predetermined radius of the magnetometer and / or the collision of the object with the magnetized structure 118. The controller 106 can wake up the magnetometer 104 in response to the trigger signaling and receive the on-demand magnetic field signal. The controller 106 can then determine magnetic field displacement data based on a difference between the on-demand magnetic field signal and the first magnetic field signal. The controller 106 can determine the state of the magnetized structure 118 based on the magnetic field displacement data, as described above. In some examples, the system 100 can further include a trigger sensor. The trigger sensor can be a low-power device that can remain active during a sleep mode.

[0073] In some examples, the trigger sensor may comprise a mechanical sensor, e.g., a vibration or impact sensor such as an accelerometer. The mechanical sensor may form part of a crash sensor system. In some examples, the damage detection system 100 may form part of a crash sensor system. The mechanical sensor may detect vibrations resulting from the movement of an object (such as a passing vehicle) or from a collision of an object with the system 100 or the magnetized structure 118. The mechanical sensor may detect the vibration / impact, and if the magnitude of the vibration is greater than a potential damage threshold, the controller 106 may receive a trigger signaling from the mechanical sensor and activate the magnetometer 104.

[0074] The controller 106 can operate the magnetometer 104, receive the on-demand magnetic field signal, and determine the magnetic field displacement data and the state of the magnetized structure 118 to determine whether the detected vibrations are associated with structural damage to the magnetized structure 118. In this manner, the system 100 can provide a damage detection function to complement the crash sensor. By determining the state of the magnetized structure 118, the system 100 can distinguish vibrations in the magnetized structure 118 resulting from a potentially damaging crash from vibrations resulting from low-risk vibrations such as a pedestrian passing through the structure. Thus, the system 100 can reduce false alarms in the crash sensor system.

[0075] In some examples, the trigger sensor may comprise an optical sensor for detecting motion. The optical sensor may comprise a passive infrared (PIR) sensor capable of detecting motion of an object within a predetermined radius. The controller 106 may receive a signal from the PIR sensor and activate the magnetometer in response to the movement of the object within the predetermined radius. In some examples, the controller 106 may receive a motion signal from the optical sensor and activate the magnetometer 104 following detection of the moving object. The controller 106 may receive an on-demand magnetic field signal from the magnetometer 104 at regular intervals (e.g., multiple measurements per second) until the motion signal indicates that motion is no longer present. In this manner, the damage detection system 100 may capture magnetic field signals and monitor the state of the magnetized structure 118 throughout the motion event. If the moving object damages the magnetized structure, the system 100 may capture a transient damage profile of the impact.

[0076] In another example, the controller 106 can receive a motion signal from the optical sensor and activate the magnetometer 104 only when the motion signal indicates that the motion event is complete (motion is no longer detectable). As a result, the damage detection system 100 can determine the state of the magnetized structure 118 after the motion event is complete. In this manner, any effect of a moving object, which may itself include ferromagnetic material, on the measured magnetic field signal can be reduced.

[0077] In response to on-demand trigger signaling from any trigger sensor, the controller 106 can receive a plurality of on-demand magnetic field signals from the magnetometer 104. The controller 106 can determine transient magnetic field displacement data including a plurality of magnetic field displacements corresponding to a difference or ratio between the corresponding on-demand magnetic field signal and the first magnetic field signal. The controller 106 can determine a transient damage profile of the magnetized structure 118 based on the transient magnetic field displacement data. The controller 106 may store the transient damage profile or transmit it to a server or a remote device for analysis of the impact event.

[0078] Vehicles, especially FLT and heavy vehicles (HV), typically have a significant mass of ferromagnetic (or ferrous) materials. As the vehicles move, they disrupt the Earth's magnetic field. Thus, vehicles passing close to the magnetometer 104 may also result in non-zero magnetic field displacement data, as well as damage or disintegration of the magnetized structure 118. The controller 106 may distinguish changes in the state of the magnetized structure 118 from a passing vehicle in at least two ways. First, the magnetized structure 118 may have a magnetic field of sufficient strength that the value of the magnetic field displacement data corresponding to damage or disintegration of the magnetized structure 118 is significantly greater than the value of the magnetic field displacement data corresponding to the passing vehicle. As a result, the first damage level threshold may be greater than the value of the magnetic field displacement data corresponding to a vehicle passing within the detection range of the magnetometer 104.

[0079] The second way in which the controller 106 can distinguish a change in the state of the magnetized structure 118 from a passing vehicle is based on a permanent change to the received magnetic field signal resulting from damage or disassembly. In the case of a passing vehicle, the magnetic field displacement data may decrease and return to zero when the vehicle passes. In the case of damage or disassembly, the magnetic field displacement data does not decrease or return to zero. Thus, following receipt of the on-demand magnetic field signal, the controller 106 can continue to receive the on-demand magnetic field signal at regular intervals until the magnetic field displacement data reaches a steady state value (indicating that any vehicle is stationary, has left the detection range of the magnetometer 104, or no vibrations have arisen from the vehicle). The controller 106 can then determine the magnetic field displacement data based on the difference between the steady state value of the on-demand magnetic field signal and the first magnetic field signal to determine the state of the magnetized structure 118.

[0080] In some examples, the damage detection system 100 can utilize the magnetic field disturbance caused by a passing vehicle to determine whether an object indicated by the trigger signaling (motion or vibration) is a vehicle. For example, the controller 106 can determine the magnetic field displacement data based on the difference between the on-demand magnetic field signal and the first magnetic field signal. The controller 106 can determine that the object is a vehicle if the magnetic field displacement data exceeds one or more displacement thresholds. For example, if the magnetic field displacement data is greater than one or more displacement thresholds, the controller 106 can determine that the object is a vehicle, otherwise the controller 106 can determine that the object is not a vehicle (e.g., a pedestrian) and return the system 100 to a sleep mode. If the object is determined to be a vehicle, the system can maintain the magnetometer 104 in an active state until the magnetic field displacement data remains below one or more sleep thresholds for a predetermined period of time. This can ensure complete data capture of any vehicle detection event.

[0081] The one or more displacement thresholds may be less than the condition thresholds corresponding to the damage level and degradation of the magnetized structure. In this manner, the controller 106 can distinguish the presence of a vehicle from a change in the state of the magnetized structure.

[0082] In response to determining that the object is a vehicle, the controller can collect multiple on-demand magnetic field signals and determine the transient magnetic field displacement data as described above. The controller 106 can determine any of the location, speed, velocity, trajectory, or presence of the vehicle based on the transient magnetic field displacement data. In some examples, the magnetic characteristics of the vehicle can be pre-determined. For example, in a warehouse environment, forklift trucks, each having substantially the same mass of ferromagnetic material, may be the only vehicle type for detection. The controller 106 can be pre-configured or programmed with a conversion factor to convert values ​​of the magnetic field displacement in one or more axes to corresponding distances to the forklift truck along one or more axes. In other examples, the controller 106 can receive an identification signal from the vehicle and identify the magnetic characteristics or ferromagnetic mass of the vehicle based on the identification signal. In this manner, the controller 106 can determine the location and dynamic characteristics of the vehicle.

[0083] The controller 106 can activate the output signal generator 108 based on the position and / or dynamic characteristics of the vehicle. For example, if the vehicle's trajectory is incident on a magnetized structure, the controller can activate the output signal generator to generate a warning signal to alert the vehicle operator. In examples having mechanically triggered sensors, the damage detection system 100 can form part of a crash sensor system, where the system 100 can provide multiple functions: (i) warning approaching vehicles of a collision risk, (ii) determining whether a detected vibration or crash is vehicle-related, and (iii) determining the damage level of the crash.

[0084] Figure 2A shows a schematic diagram of another damage detection system 200 according to an embodiment of the present disclosure. Features in Figure 2A already described above in relation to Figure 1 are given corresponding reference numbers in the 200 series and will not necessarily be described again here.

[0085] The system 200 includes multiple subsystems, each monitoring different portions of the same magnetized structure 218. For example, each subsystem may monitor each leg or shelf of a rack unit in a warehouse, or each post in a safety barrier system. In other examples, one or more subsystems may monitor separate magnetized structures. Each subsystem includes a housing 202a, 202b, 202n that includes a magnetometer 204a, 204b, 204n and a controller 206a, 206b, 206n. Each subsystem also includes a transceiver (not shown) that can communicate with the server 210. The server 210 may include a user interface or may communicate with other devices having a user interface, such as a personal mobile terminal or computer. In this manner, the server 210 can collect data from each of the subsystems to monitor each portion of the magnetized structure 218. The system 200 can determine one or more portions of the structure 218 that are damaged or degraded. In this manner, the system can alert a user that a particular portion of the structure requires inspection, temporary safety measures (safety codes, speed limits, one-way restrictions, etc.), and / or repairs. The system 200 can analyze the monitoring data to identify portions of the magnetized structure 218 that have a frequency of damage or disassembly that exceeds an acceptable threshold. In a warehouse or factory environment, a user can implement changes to the structure layout (rearrange the layout, implement protective measures, etc.) to improve the safety of the environment.

[0086] In the example of FIG. 2A, each subsystem has a dedicated magnetometer 204a, 204b, 204n and a dedicated local controller 206a, 206b, 206c to implement the controller functions as described above in connection with FIG.

[0087] Each subsystem also has a dedicated output signal generator 208. In other examples, the subsystems may be communicatively coupled to a common output signal generator. For example, two or more subsystems may be wirelessly coupled to the same audible or visible output signal generator and / or to a common gateway that may perform some of the functions of the controller 206 and / or pass information to and from the server 210.

[0088] Figure 2B shows a schematic diagram of a further damage detection system 200' according to an embodiment of the present disclosure. Features of Figure 2B already described above in relation to Figure 1 are given corresponding reference numerals of the 200' series and will not necessarily be described again here.

[0089] In this example, the system 200' also includes multiple subsystems. In this example, each subsystem monitors a respective separate magnetic structure 218'a, 218'b, 218'n. A further difference compared to the system of FIG. 2A is that the controller 206' is located in the server 210' and provides the functionality described above in relation to FIG. 1 to the multiple subsystems. Each subsystem comprises a housing 202'a, 202'b, 202'n that contains a magnetometer 204'a, 204'b, 204'n and a transceiver 212'a, 212'b, 212'c. In this example, the subsystems function as dumb devices in that the transceivers 212'a, 212'b, 212'n transmit signals from the corresponding magnetometers 204'a, 204'b, 204'n to the controller 206' for processing and receive signals from the controller 206' to activate the corresponding output signal generators 208'a, 208'b, 208'n. In this manner, the functionality of the controller 206' described in relation to FIG. 1 is implemented in the server 210'.

[0090] Figures 2A and 2B each illustrate an example where the controller functionality is implemented locally to the subsystem or on a server. It will be appreciated that in other examples, any element of the controller functionality described in relation to Figure 1 may be performed locally to the subsystem or remotely from the subsystem on a server.

[0091] 3A-3C show an exemplary implementation of a damage detection system according to an embodiment of the present disclosure. In this example, the damage detection system 300 comprises a plurality of magnetometers 304-1, 304-2 integrated into the caps 314-1, 314-2 of the safety posts 316-1, 316-2 of the smart barrier system. The system 300 further comprises a controller 306 located on a server 310 that communicates with the magnetometers 304-1, 304-2. The system 300 further comprises one or more processors and transceivers (not shown) co-located with each magnetometer 304-1, 304-2 in the caps 314-1, 314-2. In this manner, each cap forms a subsystem similar to that described in connection with FIG. 2B. The one or more processors and transceivers enable communication of magnetic field and status signals to and from the controller 306, as well as processing of such signals. It will be appreciated that other architectures, such as multiple independent subsystems as described in connection with FIG. 2A, can provide the same functionality as the illustrated system 300. Magnetometers 304-1, 304-2 of damage detection system 300 are positioned to monitor a magnetized safety barrier 318 that extends between safety posts 316-1, 316-2.

[0092] In this example, each subsystem in caps 314-1, 314-2 includes a low power trigger sensor in the form of an accelerometer (not shown).

[0093] At a first time, the controller 306 receives a first magnetic field signal from each of the magnetometers 304-1, 304-2 of the magnetized structure 318. The controller 306 may receive the first magnetic field as part of a calibration routine when the barrier system is initially installed.

[0094] At a second time shown in FIG. 3A, the controller receives a second magnetic field signal of the magnetization structure 318 from each of the magnetometers 304-1, 304-2. The controller 306 determines magnetic field displacement data based on the difference between the second magnetic field signal and the respective first magnetic field signal. Because the magnetization structure 318 has not been moved or damaged since being installed, the value of the magnetic field displacement data is zero or close to zero. The controller 306 determines that the condition of the magnetization structure 318 is correctly installed and undamaged because the value of the magnetic field displacement data is less than all condition thresholds and tolerance thresholds.

[0095] The controller 306 can continue to receive further magnetic field signals from the magnetometers 304-1, 304-2 at regular intervals to continuously monitor the status of the barrier system. During the regular intervals, the system 300 operates in a sleep mode in which the magnetometers 304-1, 304-2 are disabled and the accelerometers are active.

[0096] Then, as shown in FIG. 3B, the controller 306 receives trigger signaling from two accelerometers of the caps 314-1, 314-2 in response to a vehicle crash. The controller 306 activates the magnetometers 304-1, 304-2 corresponding to the caps 314-1, 314-2 and receives the on-demand magnetic field signals. The controller 306 receives a plurality of on-demand magnetic field signals from each magnetometer 304-1, 304-2 and determines transient magnetic field displacement data based on the difference between each of the on-demand magnetic field signals and the respective first magnetic field signals of each magnetometer 304-1, 304-2. After the on-demand magnetic field signals settle to a certain steady value, the controller 306 determines the state of the magnetized structure 318 based on the magnetic field displacement data. The controller 306 determines that the state of the magnetized structure 318 is severely damaged because the value of the magnetic field displacement data is greater than the severe damage level condition threshold. The controller 306 can determine the transient damage profile and / or dynamic characteristics of the vehicle (if the vehicle includes ferrous materials) based on the transient magnetic field displacement data.

[0097] The controller 306 can activate an output signal generator to alert a user that the magnetized structure 318 has been damaged. For example, the server can communicate with the user's mobile terminal, which can host a mobile application that communicates with the server 310 and the controller 306. The user can then take corrective action including inspecting the area, disconnecting from the area, implementing speed restrictions, etc. The controller 306 can activate a visible or audible output signal generator local to the magnetized structure 318 to alert users close to the barrier system. The output signal generator can include a display screen that provides messages including temporary speed restrictions, temporary access restrictions, etc.

[0098] The controller 306 can compare the first magnetic field displacement data corresponding to the first magnetometer 304-1 with the second magnetic field displacement data corresponding to the second magnetometer 304-2 and determine the location of the damage on the magnetized structure based on the comparison. For example, the controller 306 may simply determine that the location of the damage is closer to the particular cap 314-1, 314-2 corresponding to a higher value of the magnetic field displacement data. As a further example, the controller 306 can calculate a ratio of the values ​​of the magnetic field displacement data of the first and second magnetometers 304-1, 304-2 in one or more axes. The controller 306 can then determine the location of the damage along a length extending between the first magnetometer 304-1 and the second magnetometer 304-2 based on the calculated ratio. As an example, if the calculated ratio of the magnitude of the displacement data of the first magnetometer 304-1 to the second magnetometer 304-2 is 2:1, the controller can determine that the location of the damage is approximately one-third of the way along the length extending from the first magnetometer 304-1 to the second magnetometer 304-2. To enable location determination, each magnetometer can be calibrated to ensure that they have the same sensitivity and proportionality to the test magnetic source. In this manner, the controller 306 is configured to receive the first and second auxiliary magnetic field signals from the second magnetometer 304-2 monitoring the magnetized structure 318, determine auxiliary magnetic field displacement data of the magnetized structure 318 based on the first and second auxiliary magnetic field signals, and determine the damage location on the magnetized structure 318 based on a comparison of the magnetic field displacement data to the auxiliary magnetic field displacement data.

[0099] At a later time, as shown in Figure 3C, the controller 306 receives further magnetic field signals of the magnetized structure 318 from each of the magnetometers 304-1, 304-2. The controller 306 determines magnetic field displacement data accordingly and determines the state of the magnetized structure 318 to be resolved because the value of the magnetic field displacement data is greater than the resolved status state threshold. The controller 306 may operate the output signal generator as described above in relation to Figure 3B.

[0100] In a magnetized barrier system such as that of Figures 3A-3C, the magnetized barrier 318 may comprise a safety barrier and a number of magnetic elements coupled to the safety barrier. In some examples, the magnetized barrier 318 may comprise a wire extending through an opening along the axis (or length) of the safety barrier, with a number of (identical) magnetic elements coupled to the length of the wire and spaced (periodically) along the length of the wire. The wire may be held under tension within the safety barrier, for example each end of the wire may be fixed to each end of the magnetized barrier or to each adjacent post 316-1, 316-2. It should be understood that in this context, the term barrier may relate to any horizontal safety structure such as a barrier, fencing, railing, etc.

[0101] In response to a collision with the magnetized barrier 318, the wire and the magnetic element can oscillate to vibrate. The controller 306 can receive a plurality of further magnetic field signals from each magnetometer 304-1, 304-2 to detect the dynamics of this vibrational motion. For example, in response to a trigger signaling from the accelerometer, the controller 306 can receive a plurality of further magnetic field signals from each magnetometer 304-1, 304-2 and then determine first and second dynamic magnetic field displacement data based on the difference between each further magnetic field signal and the respective first magnetic field signal for each magnetometer 304-1, 304-2. In the same manner as described above with respect to the location of the damage, the controller 306 can determine the location of the impact on the magnetized structure 318 based on the comparison between the first dynamic magnetic field displacement data and the second dynamic magnetic field displacement data. The controller 306 can also determine the impact force based on the first dynamic magnetic field displacement data and / or the auxiliary dynamic magnetic field displacement data. For example, in the case of sinusoidal vibration, the controller 306 can determine the energy (or force) of the impact based on the amplitude, frequency, and / or damping rate of the first and / or second dynamic field displacement data. For example, the amplitude of the vibration can increase depending on the energy of the impact. In some examples, the controller 306 may compare the vibration parameters (amplitude, frequency, damping) to a reference value that is pre-determined as part of a calibration routine of the magnetized safety barrier 318. As mentioned above, after the (first and / or second) magnetic field displacement data reaches a steady state value, the controller 306 can determine the state of the magnetized structure 318.

[0102] 4 shows a flow diagram of a method for monitoring magnetized structures for damage according to one embodiment of the present disclosure. The method may be a computer-implemented method performed on a processor or controller, such as the controller described in connection with any of the systems disclosed herein.

[0103] A first step 430 includes receiving a first magnetic field signal of the magnetized structure from the magnetometer. The first magnetic field signal may include a reference or calibration magnetic field signal. A second step 432 includes receiving a second magnetic field signal from the magnetometer. A third step 434 includes determining magnetic field displacement data based on the second magnetic field signal and the first magnetic field signal. For example, the magnetic field displacement data may include a difference or ratio between the second magnetic field signal and the first magnetic field signal. A fourth step 436 includes determining a state of the magnetized structure based on the magnetic field displacement data. The method may include activating an output signal generator to indicate the state of the magnetized structure. The controller may determine the state of the magnetized structure based on a comparison of the value of the magnetic field displacement data to one or more state thresholds, including a tolerance deviation threshold (indicative of a correct assembly without damage), one or more damage level state thresholds, and one or more assembly state thresholds.

[0104] The disclosed damage detection system can advantageously complement crash sensor systems monitoring a structure to distinguish false alarms and minor vibration events from damaging crashes.

[0105] FIG. 5 illustrates a flow diagram for installing any of the damage detection systems disclosed herein, according to one embodiment of the present disclosure.

[0106] A first step 540 includes applying a magnetic element to the structure to provide a magnetized structure. Applying the magnetic element may include applying any of magnetic strips, magnetic plates, magnetic tape, magnetic particles, and / or magnetic paint to the structure. A second step 542 includes coupling a damage detection system to the magnetized structure. Coupling a damage detection system to the magnetized structure may include attaching (a part of) the damage detection system to the magnetized structure with a suitable fastener, placing (a part of) the damage detection system near the magnetized structure (so that the damage detection system can detect the magnetic field generated by the magnetic structure), and / or incorporating (a part of) the damage detection system within the magnetized structure (such as the cap in FIGS. 3A-3C). [Explanation of symbols]

[0107] 100 System, sensor system, damage detection system 102 Case 104 Magnetometer 106 Controller, remote controller 108 Output Signal Generator 118 Magnetization structure 118 Mobile Magnetization Structure 119 Magnetic Elements 200 System, Damage Detection System 200' System, Damage Detection System 202'a, 202'b, 202'n housing 202a, 202b, 202n housing 204a, 204b, 204n magnetometer 204'a, 204'b, 204'n magnetometer 206 Controller 206' Controller 206a Controller, Local Controller 206b Controller, Local Controller 206c Local Controller 206n Controller 208 Output Signal Generator 208'a, 208'b, 208'n output signal generator 210 Server 210' Server 212'a, 212'b, 212'c, 212'n transceivers 218, 218'a, 218'b, 218'n magnetization structure 300 Damage Detection System 304-1 Magnetometer, first magnetometer 304-2 Magnetometer, second magnetometer 306 Controller 310 Server 314-1 Cap 314-2 Cap 316-1 Post, Safety Post 316-2 Post, Safety Post 318 magnetization structure

Claims

1. 1. A damage detection system for monitoring a magnetized structure for damage, comprising: A safety structure comprising: the magnetization structure, the magnetization structure including a ferromagnetic material and generating its own magnetic field; a safety structure comprising a magnetometer; and a controller, the controller comprising: receiving a first magnetic field signal of the magnetized structure from the magnetometer; receiving a second magnetic field signal of the magnetized structure from the magnetometer; determining magnetic field displacement data based on the second magnetic field signal and the first magnetic field signal; A damage detection system configured to determine a state of the magnetized structure based on the magnetic field displacement data.

2. The damage detection system of claim 1 , wherein the controller is configured to determine the state of the magnetized structure based on a magnitude of magnetic field displacement in one or more axes.

3. The damage detection system of claim 2 , wherein the controller is configured to determine the condition of the magnetized structure by comparing the magnitude of the magnetic field displacement in one or more axes to one or more condition thresholds.

4. The state of the magnetization structure is the damage level of the magnetization structure, and / or A damage detection system according to claim 1 , comprising an assembled state of the magnetising structure.

5. The damage detection system of claim 1 , wherein the controller is configured to receive the first magnetic field signal as a calibration magnetic field signal as part of a calibration routine.

6. The damage detection system of claim 1 , wherein the controller is configured to output a status signal indicative of the status of the magnetization structure.

7. The damage detection system of claim 6 , further comprising an audible and / or visual indicator, and wherein the controller is configured to output the status signal by activating the audible and / or visual indicator.

8. The damage detection system of claim 6 , wherein the controller is configured to output the status signal by transmitting status data and / or the magnetic field displacement data to an external controller.

9. The controller: Receive a trigger signal; selectively activating the magnetometer in response to the trigger signaling; The damage detection system of claim 1 , further configured to receive a magnetic field from the magnetometer.

10. The damage detection system of claim 9 , wherein the trigger signaling comprises a periodic trigger signal for selectively activating the magnetometer to receive magnetic fields according to a monitoring schedule.

11. The trigger signaling includes: the movement of objects within a predetermined radius of the magnetometer; and / or 11. A damage detection system according to claim 9 or 10, including an on-demand signal from a trigger sensor responsive to a collision of an object with the magnetised structure.

12. The damage detection system of claim 11 comprising the trigger sensor.

13. The controller: receiving an on-demand magnetic field signal from the magnetometer; determining magnetic field displacement data based on the on-demand magnetic field signal and the first reference magnetic field signal; 13. The damage detection system of claim 11 or 12, further configured to determine whether the object is a vehicle in response to the magnetic field displacement data exceeding one or more displacement thresholds.

14. 14. The damage detection system of claim 13, further comprising an output signal generator, the controller configured to activate the output signal generator in response to the magnetic field displacement data exceeding the one or more displacement thresholds.

15. The controller: receiving a plurality of on-demand magnetic field signals from the magnetometer; determining transient magnetic field displacement data including a plurality of magnetic field displacements corresponding to a difference or ratio between a corresponding on-demand magnetic field signal and the first magnetic field signal; 15. The damage detection system of claim 11, configured to determine any of the position, speed, velocity, trajectory, or presence of the object, or a transient damage profile of the magnetized structure based on the transient magnetic field displacement data.

16. The damage detection system of claim 1 , further comprising one or more magnetic elements for magnetizing the structure.

17. The damage detection system of claim 1 , wherein the magnetizing structure comprises a polymeric safety structure and one or more magnetic elements for magnetizing the polymeric safety structure.

18. The magnetic element comprises: a lining of magnetic material on said polymeric safety structure; injecting a magnetic material into said polymeric safety structure; Magnetic material embedded in a secure polymer construction, Magnetic strips, magnetic plates, magnetic tapes, magnetic particles, and / or The damage detection system of claim 17 including one or more of a magnetic paint affixed to the polymeric safety structure.

19. The controller: receiving a first auxiliary magnetic field signal and a second auxiliary magnetic field signal from a second magnetometer monitoring the magnetization structure; determining auxiliary magnetic field displacement data of the magnetization structure based on the first auxiliary magnetic field signal and the second auxiliary magnetic field signal; 19. The damage detection system of claim 1 , further configured to determine a location of damage on the magnetized structure based on a comparison between the magnetic field displacement data and the auxiliary magnetic field displacement data.

20. 20. The damage detection system of claim 1 , wherein the safety structure comprises a structure for protecting or isolating property or pedestrians from vehicles, or a structure for protecting or isolating pedestrians from a hazardous area.

21. a plurality of magnetometers, each magnetometer coupled to a corresponding transceiver; 21. The damage detection system of claim 1, further comprising: a server configured to communicate with each of the plurality of magnetometers via the corresponding transceiver.

22. 1. A magnetized safety barrier system comprising: A damage detection system according to claim 19; the second magnetometer; a magnetized safety barrier; A magnetized safety barrier system, wherein the magnetometer is associated with a first end of the magnetized safety barrier and the second magnetometer is associated with a second end of the magnetized safety barrier.

23. The magnetic safety barrier comprises: A safety barrier; a wire extending along an axis of the safety barrier through an opening; 23. The magnetized safety barrier system of claim 22 comprising a plurality of magnetic elements attached to and spaced along the length of the wire.

24. 22. A method of installing a damage detection system according to any one of claims 1 to 21, comprising the steps of: applying a magnetic element to a structure to provide said magnetized structure; and coupling the damage detection system to the magnetized structure.

25. 1. A computer-implemented method for monitoring a magnetized structure of a safety structure for damage, the safety structure comprising: the magnetization structure, the magnetization structure including a ferromagnetic material and generating its own magnetic field; A magnetometer; The method comprises: receiving a first reference magnetic field of the magnetization structure from a magnetometer positioned to monitor the magnetization structure; receiving a second reference magnetic field of the magnetization structure from the magnetometer; determining magnetic field displacement data based on the second magnetic field reference and the first magnetic field reference; determining a state of the magnetization structure based on the magnetic field displacement data.

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