Method and system for detecting a change in an element arrangement in a closed space

Abstract

A method for detecting a change in an element arrangement in a closed space (SS), internally comprising at least one transmitter (TX) for transmitting a transmission signal, at least one controllable reflector (RIS) for reflecting signals in at least one configurable reflection direction, at least one receiver (RX) for receiving the reflected signals, and at least one first element for reflecting the transmission signal and / or the reflected signal during a first state determination, and at least one second element for reflecting the transmission signal and / or the reflected signal during a second state determination, wherein the following steps are carried out: - determining a first state of the closed space (SS), in which only the at least one first element is arranged in the closed space (SS), by transmitting a transmission signal, applying at least one predefined reflection direction by means of the reflector (RIS), reflecting the transmission signal and / or the reflected signal and receiving the reflected signals, and - determining a second state of the closed space (SS), in which the at least one first element and the at least one second element are arranged in the closed space (SS), by transmitting the transmission signal, applying the at least one predefined reflection direction by means of the reflector (RIS), reflecting the transmission signal and / or the reflected signal and receiving the reflected signals, and - determining a change in the element arrangement in the closed space (SS) from the difference between the first state and the second state.

Description

[0001] Method and system for detecting a change in an element arrangement in a closed space

[0002] The invention relates to a method and a system for detecting a change in an element arrangement in a closed space.

[0003] In industrial applications, it is often necessary to detect mechanical changes in a volume area, such as an equipment cabinet or a housing, where the changes can be formed, for example, in the arrangement of electronic components, electrical assemblies, devices, connecting elements or mounting elements in the volume to be observed.

[0004] A volume to be observed can be, for example, an equipment cabinet, a control cabinet, or even an entire room in a building.

[0005] Changes in the control cabinet can, for example, be caused by the replacement or extension of components, as well as the modification of components or devices, a changed cable routing, mechanical damage or even forgotten tools, as well as by acts of sabotage.

[0006] In electronic assemblies, changes to bond wires in power modules, for example, or replacement or manipulation of microchips can be detected, for example if a wire is damaged and two wire parts are formed that are no longer connected to each other.

[0007] In the current state of the art, a manual inspection is usually carried out on site to detect such changes.

[0008] The object of the invention is to provide a solution in which changes in a closed room can be automatically detected or determined in a simple and reliable manner.

[0009] The object of the invention is achieved by a method for detecting a change in an element arrangement in a closed space, internally comprising at least one transmitter for transmitting a transmission signal, at least one controllable reflector for receiving reflected signals and for reflecting the transmission signal in at least one configurable reflection direction, at least one receiver for receiving the reflected signals, and at least one first element for reflecting the transmission signal and / or the reflected signal during a first state determination, and at least one second element for reflecting the transmission signal and / or the reflected signal during a second state determination, wherein the following steps are carried out: determining a first state of the closed space, in which only the at least one first element is arranged in the closed space, by transmitting a transmission signal,Applying at least one predetermined reflection direction in the reflector, reflecting the transmitted signal and / or the reflected signal and receiving the reflected signals, and,

[0010] Determining a second state of the closed space, in which the at least one first element and the at least one second element are arranged in the closed space, by transmitting the transmission signal, applying the at least one predetermined reflection direction in the reflector, reflecting the transmission signal and / or the reflected signal and receiving the reflected signals, and

[0011] Determine the change in the element arrangement in the closed space from the difference between the first and the second state.

[0012] According to the invention, changes, for example in a control cabinet, are detected by regularly testing the volume to be observed for its high-frequency properties, such as reflections or dielectric properties of the medium and the components in the volume, preferably by means of millimeter waves.

[0013] First, the properties of a reflected transmission signal are measured and stored for a reference configuration.

[0014] A subsequent control measurement can determine whether there are deviations from the reference configuration, i.e., altered properties of the reflected transmitted signal. This can indicate a change in the element arrangement in the enclosed space, for example, a structural change in a component compartment, and trigger a warning. A closed space, such as a component compartment, is defined as an enclosed volume defined, for example, by walls, a lid, and a floor. This is preferably done to protect the enclosed components from external influences, for example, by using an electrically conductive material.

[0015] The at least one first element and the at least one second element form an element arrangement in the closed space, wherein changes therein can be determined by the method.

[0016] The respective elements can also include objects that do not have a technical function.

[0017] It is therefore advantageous if the enclosed space, for example a control cabinet, has a complete metallic, electrically conductive shell in order to form a good barrier to external influences, although other electrically conductive materials can also be used.

[0018] The electrically conductive materials are intended to reflect the emitted transmission signal or to form a good barrier against external influences.

[0019] However, it is not absolutely necessary for the casing to be made entirely of metal, but this can increase detection sensitivity.

[0020] In particular, smaller openings do not interfere with the detection of elements or do not adversely affect them, although the size of openings may depend on the transmission frequency of the transmission signal.

[0021] It is therefore preferred if the closed space has electrically conductive walls which enclose the surface of the enclosed volume of the space to more than 80%, particularly preferably to more than 90% or to more than 95%.

[0022] A wall, ceiling or floor of a room in a building made of concrete conducts electricity sufficiently well to be used for the method according to the invention.

[0023] The enclosed space can be, for example, an equipment cabinet, a switch cabinet, but also an entire room in a building, such as an operating room, for example for a transformer or for high-voltage switches or for computers.

[0024] The method works particularly well when the elements are arranged statically in the enclosed space.

[0025] In the case of moving parts or elements in space, it is particularly advantageous if the elements regularly move back to an initial position and then the method according to the invention is carried out.

[0026] It is also advantageous if several valid states are detected for different positions of the elements and the method according to the invention is carried out at the respective positions.

[0027] The solution according to the invention offers many advantages, for example, a simple and cost-effective, even integrated radar system can be used for the detailed evaluation of the reflection properties in a given volume.

[0028] Furthermore, by using a steerable reflector, the volume to be observed can be several times larger than with a pure transmitter / receiver system, which can also improve accuracy. Furthermore, by using an active steerable reflector, the radar system's transmit power can be significantly lower due to amplifying elements through the reflector, reducing system complexity and cost.

[0029] Measurements can also be repeatedly collected and evaluated at regular points in time, allowing successive changes to be detected separately and enabling continuous monitoring and tracking of changes to determine the cause of an existing error or to analyze a system change.

[0030] The detection of a dismantling to an original state of the control cabinet SS including the installed components G1-G4, KK1-KK3, HS1-HS3, K1, K2 can also be supported.

[0031] In the case of control cabinets, it is conceivable that a change in the position of copper wires in a plastic cable duct could be detected, meaning that a replacement of a device with an otherwise mechanically identical counterfeit could be detected due to the slightly different wiring arrangement after the replacement.

[0032] For example, RF reflectometry measurements on electronic printed circuit boards have shown that a bent bond wire, volume changes in the solder, and rotations and displacements of individual components can be detected.

[0033] An additional advantage is that the system does not record any image data, which is a data protection advantage over camera systems.

[0034] Furthermore, in contrast to an “alarm system-like” access protection system, an alarm is not only triggered at the time of access, but also any change to the existing system is displayed, which can result in a higher level of security.

[0035] The process can be further developed by making the change in an element arrangement a structural change in the closed space.

[0036] The structural change in the closed space refers to a change in the mechanical arrangement or position of the elements or components, which cause a change in the reflection behavior of the transmitted signal in the closed space.

[0037] The change in the element arrangement can thus cause a change in the propagation of the transmitted signal in the closed space, which can be recognized and detected as a structural change in the closed space.

[0038] The process can be further developed by using the enclosed space as a closed component space, preferably a control cabinet. This makes it particularly easy to monitor the control cabinet after maintenance and check whether, for example, tools were accidentally left behind or the configuration in the control cabinet was improperly changed.

[0039] The method can be further developed by classifying the received signals in a subsequent analysis, for example by applying methods based on artificial intelligence, and by generating and applying a corresponding machine learning model.

[0040] The first state of the closed space can be determined by model training, and the state recognition or inference can be performed by determining the second state of the closed space.

[0041] In a further development of the invention, it is provided that the at least one configurable direction of the reflector has at least three, preferably five, particularly preferably ten directions, which are configured sequentially in time by the reflector during the state determinations of the closed space.

[0042] This can further increase the accuracy of the process.

[0043] For example, directions can be defined in which particularly significant reflections or absorptions or even dispersions occur, which allow a good classification of the received signals in a subsequent analysis, for example with the help of artificial intelligence.

[0044] The object is also achieved by a system for detecting a change in an element arrangement in a closed space, comprising at least one transmitter which is arranged within the closed space and is configured to transmit a transmission signal, and a controllable reflector which is arranged within the closed space and is configured to receive the transmission signal and to reflect it in at least one configurable direction, and at least one first element which is arranged within the closed space such that the transmission signal and / or the reflected signal is reflected thereon, and at least one receiver which is arranged within the closed space and is configured to receive the reflected signals, and the system is further configured to detect a first state of the closed space in which only the at least one first element is arranged in the closed space,by transmitting the transmission signal, applying at least one predetermined reflection direction through the reflector and receiving the reflected signals, and to determine a second state of the enclosed space, in which the at least one first element and the at least one second element are arranged in the enclosed space so as to reflect the transmission signal and / or the reflected signal, by transmitting the transmission signal, applying the at least one predetermined direction through the reflector and receiving the reflected signals, and to determine a change in the element arrangement in the enclosed space from the difference between the first and the second state.

[0045] In a further development of the invention, it is provided that the at least one second element is formed by a separated part of the at least one first element.

[0046] This means, for example, that a wire that was broken, severed or burned out during operation and which originally connected two components can be detected with two remaining wire parts or wire ends.

[0047] In a further development of the invention, it is provided that the at least one second element comprises a mechanical or electrical or electronic tool

[0048] This makes it possible, for example, to detect a tool that was accidentally left behind in the switchboard during maintenance.

[0049] In a further development of the invention, it is provided that the closed space is a component space, preferably a switch cabinet, and the at least one first element comprises a component, preferably an electronic device and / or an electrical cable.

[0050] The monitoring of an electrical control cabinet with components, devices, assembly parts or cables is particularly well suited for the application of the invention.

[0051] In a further development of the invention, it is provided that the component space is an electronic assembly, and that at least a first component comprises an electronic semiconductor component.

[0052] The monitoring of an electrical assembly with components, devices, assembly parts or cables is particularly well suited for the application of the invention.

[0053] In a further development of the invention, it is provided that the at least one configurable direction has at least three, preferably five, particularly preferably ten directions, which can be configured sequentially in time by the reflector during the state determinations of the closed space.

[0054] For example, directions can be defined in which particularly significant reflections or absorptions or even dispersions occur, which allow a good classification of the received signals in a subsequent analysis, for example with the help of artificial intelligence.

[0055] These directions can be set staggered in time to keep the system complexity simple and use a simple controllable reflector.

[0056] In a further development of the invention, it is provided that the closed space is formed at least partially from an electrically conductive material, preferably to more than 50%, particularly preferably to more than 75%, in each case of the inner surface of the component space.

[0057] This allows the reflections to be particularly targeted by directing them to predetermined electrically conductive points or surfaces in which particularly significant reflections or absorptions or dispersions occur, which allow a good classification of the received signals in a subsequent analysis, for example with the help of artificial intelligence.

[0058] The invention is described in more detail using exemplary embodiments in the following figures. The figures show in

[0059] Fig. 1 shows a first embodiment of the invention for a control cabinet in a cross-sectional view,

[0060] Fig. 2 shows a second embodiment of the invention for a printed circuit board in a cross-sectional view.

[0061] It is clear that appropriate controls for the modules or connections shown are required for system control. For clarity, these elements are not shown in the figures.

[0062] Fig. 1 shows a first embodiment of the invention with a closed component space in the form of a switch cabinet SS.

[0063] In this example, an element in a closed space is understood to be a component or a tool.

[0064] The components include electronic devices G1-G4, which are mounted on top hat rails HS1-HS3, i.e. DIN rails, or on the floor B of the control cabinet SS.

[0065] The devices are connected with lines or cables K1, K2, some of which are laid in cable ducts KK1-KK3.

[0066] The control cabinet has a metallic, electrically conductive door T, through which the components are accessed during maintenance. Furthermore, a tool in the form of pliers Z, which was inadvertently left behind during maintenance, is shown in the figure on the floor B of the control cabinet SS. This tool should be identified.

[0067] Furthermore, the rear wall of the control cabinet is made of an electrically conductive metal plate on which the components are mounted.

[0068] Thus, the control cabinet has more than 75% of an electrically conductive internal surface of the component space SS.

[0069] Fig. 2 shows a second embodiment of the invention with a component space in the form of a printed circuit board (FBG).

[0070] The component compartment FBG is an electronic assembly in a flat design and with a metallic cover, which assembly comprises first components in the form of electronic semiconductor components BT1-BT3.

[0071] The semiconductor components BT1-BT3 are connected with bond wires D1, D2.

[0072] Furthermore, two wire ends D3a and D3b between the semiconductor components BT2 and BT3 that are broken during operation are shown in the figure and are to be identified.

[0073] Otherwise, the embodiments of the figures are to be understood analogously and the further explanations apply mutatis mutandis.

[0074] The system for detecting a change in an element arrangement in a closed component space FBG comprises a transmitter TX, which is arranged within the component space FBG and is configured to transmit a transmission signal.

[0075] The TX transmitter includes transmitter electronics and a transmitter antenna. Essentially, only the transmitter antenna needs to be located inside the control cabinet, but due to its simplicity, the TX transmitter is a compact, integrated transmitter module with electronics and antenna.

[0076] Furthermore, the system comprises a controllable reflector RIS, which is arranged within the component space SS, FBG and is configured to receive the transmission signal and to reflect it in several configurable directions.

[0077] The configurable directions include, for example, ten directions which can be configured sequentially in time by the reflector RIS during the state determinations of the component space SS, FBG and which are directed, for example, towards metallic parts of the control cabinet.

[0078] In addition, the system comprises several components arranged within the component space SS, FBG in such a way that the transmitted signal and / or the reflected signal are reflected. The first components are assemblies and electrical and mechanical connecting elements arranged and mounted in the control cabinet.

[0079] A second component may be a tool accidentally left behind during maintenance.

[0080] Furthermore, the system comprises a receiver RX, which is arranged within the component space SS, FBG and is configured to receive the reflected signals,

[0081] The receiver RX has, like the transmitter TX, a receiving electronics and a receiving antenna, here as a compact integrated receiving module with electronics and antenna.

[0082] The transmitted, reflected and received signals are shown in dashed lines in the figures, whereby direct signal paths between transmitter and receiver, but also multi-path paths via the controllable reflector RIS or via components or devices G1- G4, cables K1, K2, or also the clamp Z or walls or the door T of the control cabinet SS can be seen.

[0083] The system is also designed to perform the following procedural steps:

[0084] First, determining a first state of the component space SS, FBG in which only the first components are arranged in the component space SS, FBG by transmitting the transmit signal, applying the predetermined reflection directions by the reflector RIS and receiving the corresponding reflected signals.

[0085] Then, determining a second state of the component space SS, FBG, in which the first components and the second component in the component space SS, FBG are arranged to reflect the transmitted signal and / or the reflected signal, by transmitting the transmitted signal, applying the predetermined directions by the reflector RIS and receiving the reflected signals.

[0086] Subsequently, determining the change of the element arrangement in the component space SS, FBG from the difference between the first and the second state.

[0087] In other words, the radar system allows the assessment of the reflection properties of a space illuminated by the transmitting antenna.

[0088] The usually broadband transmission signal encounters reflective objects, for example of a conductive or dielectric nature, and is reflected by these objects.

[0089] Several transmission signals are transmitted, reflected and then received at different times.

[0090] Parts of these reflected signals in turn hit the receiving antenna and are then evaluated, especially across the entire frequency spectrum of the received signal, which allows the distance and reflection properties of reflecting objects in the room to be efficiently determined.

[0091] A system with a single antenna, or with a transmitting antenna and an additional receiving antenna, has low costs and low complexity, but this can lead to a lack of spatial resolution of detected objects.

[0092] With two antennas, i.e. separate transmitter TX and receiver RX, the position cannot be determined unambiguously and changes within the area illuminated by the transmitter TX can only be roughly detected, which means that the data basis of such a measurement is small and the detection can therefore be unreliable.

[0093] However, systems with multiple transmitters and receivers (not shown in the figures), for example with highly integrated microchips or corresponding antennas, can also be used to achieve high detection accuracy.

[0094] The reflection properties of the spatial area to be observed and thus the transmission between transmitter TX and receiver RX can be specifically changed by the adjustable reflector RIS.

[0095] For example, the transmitter TX can be directed at the reflector RIS to control the distribution of the transmission power in the room and the room can be divided into angular areas that can be illuminated sequentially and precisely analyzed by performing a statistical evaluation of the data for changes.

[0096] The controllable reflector RIS should have the most significant influence on the radiation field and should therefore be positioned at a location where its reflection changes have a high effect on the radiation field in the room.

[0097] Aligning the antennas of the transmitter TX and receiver RX to one or more controllable reflectors RIS is an obvious option, although for some applications it may also be useful not to directly illuminate the controllable reflector RIS.

[0098] For example, when evaluating printed circuit boards, the RIS can be installed next to the corresponding antennas in a housing cover, preferably made of electrically conductive material, so that both the antennas and the controllable reflector RIS face the printed circuit board.

[0099] It is important that the properties of the observed space have a strong effect on the transmission between the transmit and receive signals and that the controllable reflector RIS can influence this transmission as strongly as possible.

[0100] It is advantageous that the radiation field during measurements in the observed volume is not dependent on external influences. Therefore, it is advantageous for the control cabinet to have a completely metallic shell to provide a good barrier against external influences. This is often necessary due to electromagnetic compatibility requirements for the control cabinet. Optionally, additional high-frequency seals can be used in the door area. Shielding is often not as important for electronic assemblies, as the observed space is rather small, and reflections outside the area are subject to higher attenuation compared to the interior.

[0101] Regardless of the grammatical gender of a particular term, persons with male, female or other gender identities are included.

[0102] List of reference symbols:

[0103] B Control cabinet floor

[0104] BT1-BT1 component

[0105] D1, D2 Bond wire, whole D3a, D3b Bond wire, broken

[0106] FBG flat module

[0107] G1-G4 device

[0108] HS1-HS3 top hat rail, DIN rail

[0109] K1, K2 cable KK1-KK3 cable duct

[0110] RIS controllable reflector

[0111] RX receiver

[0112] SS control cabinet

[0113] TX transmitter Z clamp

Claims

Patent claims 1. A method for detecting a change in an element arrangement in a closed space (SS, FBG), internally comprising at least one transmitter (TX) for transmitting a transmission signal, at least one controllable reflector (RIS) for reflecting signals in at least one configurable reflection direction, at least one receiver (RX) for receiving the reflected signals, and at least one first element for reflecting the transmission signal and / or the reflected signal during a first state determination, and at least one second element for reflecting the transmission signal and / or the reflected signal during a second state determination, wherein the following steps are carried out: Determining a first state of the closed space (SS, FBG), in which only the at least one first element is arranged in the closed space (SS, FBG), by transmitting a transmission signal, applying at least one predetermined reflection direction through the reflector (RIS), reflecting the transmission signal and / or the reflected signal, and receiving the reflected signals, and Determining a second state of the closed space (SS, FBG), in which the at least one first element and the at least one second element are arranged in the closed space (SS, FBG), by transmitting the transmission signal, applying the at least one predetermined reflection direction through the reflector (RIS), reflecting the transmission signal and / or the reflected signal, and receiving the reflected signals, and Determine the change in the element arrangement in the closed space (SS, FBG) from the difference between the first and the second state.

2. Method according to the preceding claim, wherein the change in an element arrangement is a structural change in the closed space.

3. Method according to one of the preceding claims, wherein the closed space is a closed component space, preferably a control cabinet.

4. Method according to one of the preceding claims, wherein the at least one configurable direction of the reflector (RIS) has at least three, preferably five, particularly preferably ten directions, which are configured sequentially in time by the reflector (RIS) during the state determinations of the closed space (SS, FBG).

5. System for detecting a change in an element arrangement in a closed space (SS, FBG), comprising at least one transmitter (TX) arranged within the closed space (SS, FBG) and configured to transmit transmission signals, and at least one controllable reflector (RIS) arranged within the closed space (SS, FBG) and configured to reflect signals in at least one configurable direction, and at least one first element arranged within the closed space (SS, FBG) such that the transmission signal and / or the reflected signal is reflected thereon, and at least one receiver (RX) arranged within the closed space (SS, FBG) and configured to receive signals, and the system is further configured to establish a first state of the closed space (SS, FBG), in which only the at least one first element is arranged in the closed space (SS, FBG), by transmitting the transmission signal,Applying at least one predetermined reflection direction through the reflector (RIS) and receiving the reflected signals, and determining a second state of the closed space (SS, FBG), in which the at least one first element and the at least one second element in the closed space (SS, FBG) are arranged to reflect the transmitted signal and / or the reflected signal, by transmitting the transmitted signal, applying the at least one predetermined direction through the reflector (RIS) and receiving the reflected signals, and determining the change in the element arrangement in the closed space (SS, FBG) from the difference between the first and the second state.

6. System according to the preceding claim, wherein the at least one second element is formed by a respective separated part of the at least one first element.

7. System according to claim 5 or 6, wherein the at least one second element comprises a mechanical or electrical or electronic tool (Z) 8. System according to one of claims 5 to 7, wherein the closed space is a component space (SS, FBG), preferably a switch cabinet, and the at least one first element comprises a component, preferably an electronic device (G1-G4) and / or an electrical cable (K1, K2, D1, D2).

9. System according to the preceding claim, wherein the component space (SS, FBG) is an electronic assembly, and the at least one first component comprises an electronic semiconductor component (BT1-BT3).

10. System according to one of the preceding claims, wherein the at least one configurable direction has at least three, preferably five, particularly preferably ten directions, which are configurable sequentially in time by the reflector (RIS) during the state determinations of the closed space (SS, FBG).

11. System according to one of the preceding claims, wherein the closed space (SS, FBG) is at least partially formed from an electrically conductive material, preferably to more than 50%, particularly preferably to more than 75%, in each case of the inner surface of the closed space (SS, FBG).

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