A method and system for monitoring the condition of a building

Abstract

The application relates to the technical field of optical networks, and provides a method and system for monitoring the state of a building. The method comprises the following steps: an OLT device provides incident light for a fiber grating sensor located at the lower end of the OLT device while performing data communication; the OLT device further receives reflected light from the fiber grating sensor, calculates the sensing value of the fiber grating sensor according to the wavelength of the reflected light, and monitors the state of the building corresponding to the fiber grating sensor according to the sensing value. The application multiplexes the PON for daily communication which has been deployed, does not need to additionally construct a fiber grating sensing network, greatly reduces the deployment cost and deployment period, and reduces the consumption of manpower and material resources for later maintenance.

Description

Technical Field

[0001] This invention relates to the field of optical network technology, and in particular to a method and system for monitoring the status of buildings. Background Technology

[0002] Smart cities, encompassing social, economic, and environmental fields, fully leverage advanced information and communication technologies such as the Internet of Things (IoT), cloud computing, and broadband networks to achieve comprehensive perception and intelligent decision-making regarding urban operations. Through extensive connectivity, information sharing, and collaborative operation among various urban information systems, they integrate and optimize urban resources, improve urban operation management and service levels, enhance citizens' lives and the ecological environment, improve the quality of economic development and industrial competitiveness, and achieve scientific and sustainable urban development. The construction goals of smart cities will have several significant characteristics: ubiquitous perception, efficient transmission, full integration, collaborative operation, and intelligent decision-making. Ubiquitous perception means that smart cities deploy intelligent sensing devices throughout the city to collect, monitor, and analyze information from various urban systems; efficient transmission means using high-bandwidth networks to build infrastructure; full integration means fully integrating massive amounts of data from various key urban areas to achieve effective management and comprehensive utilization of urban information; collaborative operation and intelligent decision-making mean that the core systems and related participants of a smart city can collaborate efficiently, promoting the effective integration and optimized allocation of urban resources. Based on the acquired urban information, they can make intelligent decisions regarding the needs of the government, citizens, and businesses, achieving intelligent operation and intelligent response of the city.

[0003] Due to various reasons, urban and rural housing often suffers from haphazard construction, illegal renovations, and exceeding the permitted lifespan. Furthermore, natural disasters such as earthquakes and landslides frequently lead to building collapses, causing significant loss of life and property. Therefore, an easily deployable and low-cost method is needed for building safety monitoring to provide early warnings.

[0004] A fiber optic grating (Fiber Bragg grating) is a diffraction grating formed by axially periodically modulating the refractive index of an optical fiber core using a specific method. It is a passive filtering device. Due to its advantages such as small size, low splice loss, and full compatibility with other optical fibers, and because its resonant wavelength is sensitive to changes in external environments such as temperature, pressure, and strain, fiber optic gratings have been widely used in sensing fields. Fiber optic gratings can be used as sensors for buildings to monitor deformation, tilt, and other conditions.

[0005] In existing technologies, building monitoring is typically achieved by constructing a complete fiber Bragg grating sensor network. However, as the number of buildings to be monitored increases and the monitoring range expands, the deployment scale of the fiber Bragg grating sensor network also increases. When the number of buildings to be monitored is large enough and the range is wide enough, the deployment of the fiber Bragg grating sensor network requires a large amount of cost and a long deployment cycle. At the same time, the large-scale fiber Bragg grating sensor network also requires more manpower and resources for subsequent maintenance, increasing the complexity of later management and maintenance.

[0006] Therefore, overcoming the shortcomings of the existing technology is an urgent problem to be solved in this technical field. Summary of the Invention

[0007] The technical problem to be solved by the present invention is that when there are many buildings to be monitored and the area is wide, the deployment cost of monitoring the building status through fiber optic grating sensor networks is high, the deployment cycle is long, and it is not conducive to later maintenance.

[0008] The present invention adopts the following technical solution:

[0009] In a first aspect, the present invention provides a method for monitoring the status of a building, comprising:

[0010] While performing data communication, the OLT device also provides incident light to the fiber Bragg grating sensor located at the lower end of the OLT device.

[0011] The OLT device also receives reflected light from the fiber Bragg grating sensor and calculates the sensing value of the fiber Bragg grating sensor based on the wavelength of the reflected light.

[0012] The status of the building corresponding to the fiber Bragg grating sensor is monitored based on the sensed values.

[0013] Preferably, while performing data communication, the OLT device also provides incident light to the fiber Bragg grating sensor located at the lower end of the OLT device, specifically including:

[0014] The wavelength of the downlink light emitted by the OLT device scans and changes within the data communication wavelength range, thereby providing incident light for the fiber optic grating sensor while performing data communication.

[0015] The data communication wavelength range is the wavelength range of downlink light used for data communication in a PON optical network. The operating wavelength of the fiber Bragg grating sensor is located within the data communication wavelength range, so as to provide incident light to the fiber Bragg grating sensor through the data communication function of the OLT device.

[0016] Preferably, the wavelength of the downlink light emitted by the OLT device is scanned and varied within the data communication wavelength range, specifically including:

[0017] The OLT device determines the number of times the fiber Bragg grating sensor is scheduled within a preset scheduling period based on the installation location of the fiber Bragg grating sensor and the sensing value of the fiber Bragg grating sensor.

[0018] The OLT device schedules the transmission of incident light from each fiber Bragg grating sensor according to the number of times each fiber Bragg grating sensor is scheduled within each preset scheduling cycle.

[0019] Preferably, the OLT device determines the number of times the fiber Bragg grating sensor is scheduled within a preset scheduling period based on the installation location and sensing value of the fiber Bragg grating sensor, specifically including:

[0020] If the sensing value of the fiber Bragg grating sensor exceeds the preset range, the scheduling count of the fiber Bragg grating sensor is set to the preset maximum scheduling count.

[0021] If the sensing value of the fiber Bragg grating sensor is within a preset range, then the fiber Bragg grating sensor is used as the first fiber Bragg grating sensor. The number of second fiber Bragg grating sensors whose sensing values ​​exceed the preset range within a preset area centered on the first fiber Bragg grating sensor is calculated. Based on the number of second fiber Bragg grating sensors, the scheduling number of the first fiber Bragg grating sensor is determined.

[0022] Preferably, determining the scheduling count of the first fiber optic grating sensor based on the number of the second fiber optic grating sensors specifically includes:

[0023] If there is no second fiber Bragg grating sensor, then the minimum number of scheduling attempts for the first fiber Bragg grating sensor is determined based on the age of the building corresponding to the first fiber Bragg grating sensor, and the number of scheduling attempts for the first fiber Bragg grating sensor is set as the minimum number of scheduling attempts.

[0024] If a second fiber Bragg grating sensor exists, then according to the number range of the second fiber Bragg grating sensor, the scheduling increment corresponding to the number range is selected, and the sum of the minimum scheduling number and the scheduling increment is used as the first scheduling number.

[0025] If the first scheduling count is greater than the preset maximum scheduling count, then the scheduling count of the fiber Bragg grating sensor is set to the preset maximum scheduling count; otherwise, the scheduling count of the fiber Bragg grating sensor is set to the first scheduling count.

[0026] Preferably, the OLT device also receives reflected light from the fiber Bragg grating sensor, specifically including:

[0027] When the OLT device receives uplink light, it determines whether the wavelength of the transmitted downlink light is consistent with the wavelength of the uplink light; if they are consistent, the OLT device considers the uplink light to be reflected light from the fiber optic grating sensor and receives the reflected light.

[0028] Preferably, calculating the sensing value of the fiber Bragg grating sensor based on the wavelength of the reflected light specifically includes:

[0029] When the OLT device receives reflected light, it finds a preset reflection wavelength range that covers the wavelength of the reflected light based on the wavelength of the reflected light, and determines the corresponding fiber Bragg grating sensor based on the preset reflection wavelength range; wherein, multiple fiber Bragg grating sensors connected to the lower end of the same OLT device have different preset reflection wavelength ranges.

[0030] The OLT device calculates the sensing value of the fiber Bragg grating sensor based on the fiber Bragg grating sensor and the wavelength of the reflected light.

[0031] Preferably, the OLT device calculates the sensing value of the fiber Bragg grating sensor based on the fiber Bragg grating sensor and the wavelength of the reflected light, specifically including:

[0032] The sensing value of the fiber Bragg grating sensor is calculated based on the difference between the initial reflection wavelength of the fiber Bragg grating sensor and the wavelength of the reflected light; wherein, the initial reflection wavelength is the wavelength of the reflected light corresponding to the fiber Bragg grating sensor when it is not under stress.

[0033] Preferably, the method further includes:

[0034] The OLT device uses its own data communication function to send the sensing value of the fiber optic grating sensor to the monitoring and management agency of the corresponding building and / or to notify the monitoring and management agency or residents of the status of the building.

[0035] Secondly, the present invention also provides a system for monitoring the status of a building, the system being used to implement the method for monitoring the status of a building as described in the first aspect.

[0036] Thirdly, the present invention also provides an apparatus for monitoring the status of a building, used to implement the method for monitoring the status of a building as described in the first aspect, the apparatus comprising:

[0037] At least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor for performing the method for monitoring the status of a building as described in the first aspect.

[0038] Fourthly, the present invention also provides a non-volatile computer storage medium storing computer-executable instructions that are executed by one or more processors to perform the method for monitoring the status of a building as described in the first aspect.

[0039] This invention reuses existing PONs used for daily communication, allowing fiber Bragg grating sensors to be directly connected to the PON without altering its topology. These sensors are then controlled by corresponding OLT devices to monitor building status. This eliminates the need to construct an additional fiber Bragg grating sensor network, significantly reducing deployment costs and time. Furthermore, since the fiber Bragg grating sensors and data communication use the same network, only one network needs to be maintained during later maintenance, further reducing manpower and material costs. Attached Figure Description

[0040] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments of the present invention will be briefly described below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0041] Figure 1 This is a flowchart illustrating a method for monitoring the status of a building according to an embodiment of the present invention;

[0042] Figure 2 This is a flowchart illustrating a method for monitoring the status of a building according to an embodiment of the present invention;

[0043] Figure 3 This is a flowchart illustrating a method for monitoring the status of a building according to an embodiment of the present invention;

[0044] Figure 4 This is a flowchart illustrating a method for monitoring the status of a building according to an embodiment of the present invention;

[0045] Figure 5 This is a schematic diagram of building distribution provided by an embodiment of the present invention;

[0046] Figure 6 This is a flowchart illustrating a method for monitoring the status of a building according to an embodiment of the present invention;

[0047] Figure 7 This is a schematic diagram of the architecture of a system for monitoring the status of a building, provided in an embodiment of the present invention;

[0048] Figure 8This is a schematic diagram of the architecture of a system for monitoring the status of a building, provided in an embodiment of the present invention;

[0049] Figure 9 This is a schematic diagram of the architecture of a system for monitoring the status of a building, provided in an embodiment of the present invention;

[0050] Figure 10 This is a schematic diagram of the architecture of a system for monitoring the status of a building, provided in an embodiment of the present invention;

[0051] Figure 11 This is a schematic diagram of the architecture of a device for monitoring the status of a building, provided in an embodiment of the present invention. Detailed Implementation

[0052] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0053] In the description of this invention, the terms "inner", "outer", "longitudinal", "lateral", "upper", "lower", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and do not require that this invention must be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0054] Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0055] Example 1:

[0056] In existing technologies, when the number of buildings to be monitored is large enough and the area is wide enough, the deployment of fiber optic grating sensor networks requires significant costs and a long deployment period. Furthermore, large-scale fiber optic grating sensor networks require substantial manpower and resources for subsequent maintenance, increasing the complexity of later management and maintenance. To address this issue, Embodiment 1 of this invention provides a method for monitoring the status of buildings, such as... Figure 1 As shown, it specifically includes:

[0057] In step 201, while performing data communication, the OLT device also provides incident light to the fiber Bragg grating sensor located at the lower end of the OLT device.

[0058] In this embodiment, the OLT device is used in PON (Passive Optical Network), and the data communication function is used for the daily communication of the PON network. In this embodiment, the pre-deployed PON network used for daily communication is reused, and a fiber Bragg grating sensor is connected to its downstream end. The method described in this embodiment is applied to the OLT device in the PON to monitor the building status.

[0059] The fiber Bragg grating sensor is connected to an unused port of the optical splitter at the lower end of the OLT device, or the fiber Bragg grating sensor is connected to the optical splitter via a two-stage splitting method.

[0060] When the optical splitter has enough ports, the fiber Bragg grating sensor can be directly connected to the spare ports of the optical splitter through a branch fiber; when the optical splitter has insufficient ports, a secondary splitter can be connected below the optical splitter to expand the number of connectable ports.

[0061] The reflected light from the fiber Bragg grating sensor is transmitted to the OLT device along with the uplink light used for data communication via an optical splitter.

[0062] The fiber optic grating sensor is installed at the corresponding location on the building to be monitored. The specific installation location is determined by those skilled in the art or by the installation personnel based on the monitoring requirements of the building to be monitored.

[0063] In step 202, the OLT device also receives reflected light from the fiber Bragg grating sensor and calculates the sensing value of the fiber Bragg grating sensor based on the wavelength of the reflected light.

[0064] The core of the fiber Bragg grating sensor is a section of fiber Bragg grating. The characteristics of a fiber Bragg grating are: it is highly sensitive to temperature, stress, and strain. When the fiber Bragg grating is not subjected to any stress at a certain temperature, the fiber Bragg grating will reflect light of a corresponding wavelength. This wavelength is referred to as the initial reflection wavelength of the fiber Bragg grating sensor in subsequent embodiments. The fiber Bragg grating sensor connected to the OLT device can be considered a special "passive ONU device" that does not require power.

[0065] When a fiber Bragg grating is subjected to stress at a certain temperature, it deforms, changing the wavelength of the light it can reflect. For example, a fiber Bragg grating sensor may initially reflect light at a wavelength of 1575 nm. When unstressed, the sensor will reflect any 1575 nm light received, meaning the reflected wavelength is also 1575 nm. However, when the sensor is stressed, the reflected wavelength shifts, for example, to 1576 nm. This means that when the sensor receives 1575 nm incident light, it does not reflect it; it only reflects 1576 nm incident light. The wavelength that the fiber Bragg grating sensor can reflect is referred to as the operating wavelength in subsequent embodiments. Typically, the deformation of a fiber Bragg grating sensor is limited, fixing the range of wavelengths it can reflect. This range is referred to as the preset reflection wavelength range in subsequent embodiments.

[0066] According to the characteristics of fiber Bragg gratings, under normal circumstances, the grating reflects a specific wavelength. When the external pressure or tension applied to the fiber Bragg grating changes, the wavelength reflected by the grating will also change. By adopting an appropriate installation method, the external pressure or tension can be made to correspond to the deformation of the building, so that the wavelength reflected by the grating corresponds to the deformation of the building.

[0067] In step 203, the state of the building corresponding to the fiber Bragg grating sensor is monitored based on the sensing value.

[0068] This embodiment reuses the existing PON used for daily communication. Without changing the PON topology, fiber Bragg grating sensors are directly connected to the PON and controlled by the corresponding OLT equipment to monitor the building status. This eliminates the need to build an additional fiber Bragg grating sensor network, greatly reducing deployment costs and time. Furthermore, since the fiber Bragg grating sensors and data communication use the same network, only one network needs to be maintained during later maintenance, further reducing the manpower and material resources required for later maintenance.

[0069] This embodiment also provides a specific implementation method for providing incident light to the fiber Bragg grating sensor located at the lower end of the OLT device while performing data communication, including:

[0070] The wavelength of the downlink light emitted by the OLT device scans and changes within the data communication wavelength range, thereby providing incident light for the fiber optic grating sensor while performing data communication.

[0071] The data communication wavelength range is the wavelength range of downlink light used for data communication in a PON optical network. The operating wavelength of the fiber Bragg grating sensor is located within the data communication wavelength range, so as to provide incident light to the fiber Bragg grating sensor through the data communication function of the OLT device.

[0072] Since the operating wavelength of a fiber Bragg grating sensor typically does not exceed its preset reflection wavelength range, which is determined by the sensor's inherent characteristics, the reflected light from the fiber Bragg grating sensor usually varies within a very small range centered on its initial reflection wavelength, thus forming the preset reflection wavelength range. The preset reflection wavelength range of a fiber Bragg grating sensor is typically narrow, generally only fluctuating within 1 nm centered on the initial reflection wavelength. However, downlink light used for communication typically has a wider range; for example, the data communication wavelength range of GPON is 20 nm. Wavelengths within this range can be received by the ONU device for data communication. In other words, as long as the wavelength of the downlink light is within the data communication wavelength range, the ONU device can receive the data normally.

[0073] Therefore, this embodiment utilizes the data communication wavelength multiplexing function of the OLT device itself to control the operating wavelength of the fiber Bragg grating sensor within the data communication wavelength range, thereby providing incident light to the fiber Bragg grating sensor through the data communication function. Since the operating wavelength of the fiber Bragg grating sensor changes depending on the external environment, such as varying stress, the downlink light scanning is controlled so that when the downlink light wavelength scans to the operating wavelength of the fiber Bragg grating sensor, the fiber Bragg grating sensor reflects the light.

[0074] The scanning change is determined based on the scheduling requirements of the corresponding fiber Bragg grating sensor and the preset reflection wavelength range of the fiber Bragg grating sensor. For example, if there are two fiber Bragg grating sensors at the lower end of the corresponding OLT device, namely sensor 1 and sensor 2, where the preset reflection wavelength range of sensor 1 is 1575nm~1577nm and the preset reflection wavelength range of sensor 2 is 1578nm~1580nm, and the preset reflection wavelength range of both sensors is within the data communication wavelength range, then the downlink optical wavelength of the OLT device is controlled to scan and change between 1575nm and 1580nm.

[0075] Alternatively, sensor 1 and sensor 2 can be scheduled separately. When scheduling sensor 1, the downlink optical wavelength of the OLT device scans and changes between 1575nm and 1577nm. When scheduling sensor 2, the downlink optical wavelength of the OLT device scans and changes between 1578nm and 1580nm.

[0076] The optical module in the OLT device uses a tunable laser, such as a DBR laser or a thermally modulated DFB laser, and the wavelength of the downlink light from the OLT is scanned and changed by the optical module MCU and corresponding circuit control.

[0077] Since the OLT device monitors the building status while performing data communication, the uplink light received by the OLT device comes from both the fiber Bragg grating sensor and the ONU device. In this case, it may be impossible to distinguish between the reflected light from the fiber Bragg grating sensor and the uplink light used for communication. To address this issue, this embodiment proposes the following preferred implementation method, namely, the OLT device also receives the reflected light from the fiber Bragg grating sensor, specifically including:

[0078] When the OLT device receives uplink light, it determines whether the wavelength of the transmitted downlink light is consistent with the wavelength of the uplink light; if they are consistent, the OLT device considers the uplink light to be reflected light from the fiber optic grating sensor and receives the reflected light.

[0079] If the two are consistent, the OLT device considers the uplink light to be from the ONU device, receives the uplink light, and uses it for data communication.

[0080] In PON, uplink and downlink light typically use different wavelength ranges. That is, the wavelength of the downlink light received by the ONU device is inconsistent with the wavelength of the uplink light it transmits. However, when the fiber Bragg grating sensor reflects light, the wavelength of the reflected light is consistent with the wavelength of the received light. Therefore, by determining whether the wavelengths of the uplink and downlink light are consistent, it is possible to determine whether the source of the uplink light is the ONU device or the fiber Bragg grating sensor.

[0081] In practical applications, the wavelength of light usually needs to be measured using expensive instruments. To reduce the manufacturing cost of OLT equipment, there is another alternative implementation method: the OLT equipment measures the optical power of the light and indirectly obtains the wavelength of the reflected light based on the optical power.

[0082] In practical applications, multiple fiber Bragg grating sensors may be connected to a single OLT device. In such cases, it may be impossible to distinguish which specific fiber Bragg grating sensor the received reflected light originates from. To address this problem, a preferred implementation method exists where the sensing value of the fiber Bragg grating sensor is calculated based on the wavelength of the reflected light. Figure 2 As shown, it specifically includes:

[0083] In step 301, when the OLT device receives reflected light, it finds a preset reflection wavelength range that covers the wavelength of the reflected light based on the wavelength of the reflected light.

[0084] In step 302, the corresponding fiber Bragg grating sensor is determined according to the preset reflection wavelength range; wherein multiple fiber Bragg grating sensors connected to the lower end of the same OLT device have different preset reflection wavelength ranges.

[0085] In step 303, the OLT device calculates the sensing value of the fiber Bragg grating sensor based on the fiber Bragg grating sensor and the wavelength of the reflected light.

[0086] Since multiple fiber Bragg grating sensors at the lower end of the same OLT device have different preset reflection wavelength ranges, the source of the reflected light can be determined by the wavelength of the reflected light from the fiber Bragg grating sensor.

[0087] The OLT device calculates the sensing value of the fiber Bragg grating sensor based on the fiber Bragg grating sensor and the wavelength of the reflected light, specifically including:

[0088] The sensing value of the fiber Bragg grating sensor is calculated based on the difference between the initial reflection wavelength of the fiber Bragg grating sensor and the wavelength of the reflected light; wherein, the initial reflection wavelength is the wavelength of the reflected light corresponding to the fiber Bragg grating sensor when it is not under stress.

[0089] The difference between the initial reflected wavelength and the wavelength of the reflected light of the fiber optic grating sensor is proportional to the degree of sensor deformation. The degree of sensor deformation is calculated using this difference, and the corresponding sensing value is obtained based on the degree of deformation.

[0090] To promptly notify relevant management agencies or residents and to respond to dangerous situations such as building collapse, a preferred implementation method exists, which specifically includes:

[0091] The OLT device uses its own data communication function to send the sensing value of the fiber optic grating sensor to the monitoring and management agency of the corresponding building and / or to notify the monitoring and management agency or residents of the status of the building.

[0092] The notification of the building's status can be sent by sending the sensor values ​​of the corresponding fiber optic grating sensor to the management system of the building's monitoring and management agency, which will then inform the residents. Alternatively, it can be sent directly to the building's monitoring and management agency or the residents via SMS.

[0093] One optional implementation of sending SMS messages is as follows: the OLT device connects to the operator's SMS center through a PON network, and sends SMS messages to the SMS center through a preset SMS sending software interface, thereby realizing the sending of SMS messages.

[0094] Alternatively, push notifications can be sent via a mobile app or an IPTV set-top box. The OLT can send notifications directly, or the notification can be sent to the building's monitoring and management system.

[0095] In practical applications, when a sufficient number of fiber Bragg grating sensors are connected to the optical network, the monitoring of buildings may consume a large amount of network resources, thereby affecting the daily data communication function of the PON. To address this issue, this embodiment also provides the following preferred implementation method, wherein the wavelength of the downlink light emitted by the OLT device scans and varies within the data communication wavelength range, specifically including:

[0096] The OLT device determines the number of times the fiber Bragg grating sensor is scheduled within a preset scheduling period based on the installation location of the fiber Bragg grating sensor and the sensing value of the fiber Bragg grating sensor.

[0097] The OLT device schedules the transmission of incident light from each fiber Bragg grating sensor according to the number of times each fiber Bragg grating sensor is scheduled within each preset scheduling cycle.

[0098] The preset scheduling cycle is derived by those skilled in the art based on the resource usage of the PON network and the needs of building monitoring.

[0099] In the process of scheduling the transmission of incident light from each fiber Bragg grating sensor, the downlink light of the OLT device still changes in a scanning manner. For example, when scheduling fiber Bragg grating sensors with a preset reflection wavelength range of 1578nm to 1580nm, the downlink light wavelength changes in a scanning manner between 1578nm and 1580nm.

[0100] The number of scheduling operations determines the frequency of operation of each fiber Bragg grating sensor. 。 An OLT device can schedule only one fiber Bragg grating sensor at any given time, enabling multiple fiber Bragg grating sensors under one OLT device to perform time-sharing sensing.

[0101] As an optional implementation, when the risk of collapse of a building is high (e.g., when the building is old), the scheduling frequency of its corresponding fiber Bragg grating sensor is increased to enhance the monitoring of the building. Conversely, when the risk of collapse of a building is low (e.g., when the building is young), the scheduling frequency of its corresponding fiber Bragg grating sensor is decreased to reduce the resources occupied by sensing and monitoring, and to ensure the normal operation of data communication functions.

[0102] In reality, building collapses may not be solely due to the building itself. Large-scale geological subsidence or natural disasters such as earthquakes can also trigger building collapses. In such cases, when one building is in an abnormal state, other surrounding buildings also face a significant risk of becoming abnormal. To address this risk, this embodiment also provides the following preferred implementation methods, specifically including:

[0103] The OLT device determines the number of times the fiber Bragg grating sensor is scheduled within a preset scheduling period based on the installation location and sensing value of the fiber Bragg grating sensor, specifically including:

[0104] In step 401, if the sensing value of the fiber Bragg grating sensor exceeds a preset range, the scheduling count of the fiber Bragg grating sensor is set to a preset maximum scheduling count.

[0105] In step 402, if the sensing value of the fiber Bragg grating sensor is within a preset range, then the fiber Bragg grating sensor is used as the first fiber Bragg grating sensor. The number of second fiber Bragg grating sensors whose sensing values ​​exceed the preset range within a preset area centered on the first fiber Bragg grating sensor is calculated. Based on the number of second fiber Bragg grating sensors, the scheduling number of the first fiber Bragg grating sensor is determined.

[0106] The preset maximum number of scheduling attempts is determined by those skilled in the art based on the monitoring requirements of the sensor network and the detection requirements of the fiber Bragg grating sensor installation location. The preset range is determined by those skilled in the art based on the monitoring accuracy requirements of the sensor network and the operating characteristics of the fiber Bragg grating sensor. Fiber Bragg grating sensors in different locations can use different preset ranges, or they can use the same preset range.

[0107] The installation location of the fiber Bragg grating sensor can be stored by the installation personnel during the installation process. The location coordinates are stored in relation to the preset reflection wavelength range of the fiber Bragg grating sensor, so that the position of the corresponding fiber Bragg grating sensor can be determined by the received reflected light wavelength.

[0108] When the sensing value of the fiber Bragg grating sensor exceeds the preset range, the fiber Bragg grating sensor is considered to be in an abnormal state, and the corresponding building is at risk of collapse. At this time, the monitoring intensity of the building is increased, that is, the number of times the fiber Bragg grating sensor is scheduled in each preset scheduling cycle is increased.

[0109] When the fiber Bragg grating sensor is functioning normally, i.e., the sensing value does not exceed the preset range, the scheduling frequency is determined based on the status of the surrounding fiber Bragg grating sensors. As an optional implementation, determining the scheduling frequency of the first fiber Bragg grating sensor based on the number of the second fiber Bragg grating sensors specifically includes:

[0110] In step 501, if there is no second fiber Bragg grating sensor, the minimum number of scheduling attempts for the first fiber Bragg grating sensor is determined based on the age of the building corresponding to the first fiber Bragg grating sensor, and the number of scheduling attempts for the first fiber Bragg grating sensor is set as the minimum number of scheduling attempts.

[0111] In step 502, if a second fiber Bragg grating sensor exists, the scheduling increment corresponding to the quantity range of the second fiber Bragg grating sensor is selected according to the quantity range of the quantity range, and the sum of the minimum scheduling number and the scheduling increment is used as the first scheduling number.

[0112] In step 503, if the first scheduling count is greater than the preset maximum scheduling count, the scheduling count of the fiber Bragg grating sensor is set to the preset maximum scheduling count; otherwise, the scheduling count of the fiber Bragg grating sensor is set to the first scheduling count.

[0113] In this process, those skilled in the art divide the fiber Bragg grating sensors into multiple quantity ranges based on their density, and set a scheduling increment for each quantity range.

[0114] If the number of fiber Bragg grating sensors with abnormal status is greater within a preset range centered on the corresponding building, it indicates that the building is more likely to be located in a dangerous area and its own status is more dangerous. Therefore, by increasing the number of scheduling operations, the monitoring intensity of such buildings can be increased.

[0115] For example, a person skilled in the art can set a preset minimum number of scheduling times for the fiber Bragg grating sensors in the corresponding area based on factors such as the building's age, the stability of the surrounding environment, and the history of building collapses in the area.

[0116] If the preset minimum scheduling count is set to 1 to 3 times, when the building age exceeds 50 years, the corresponding fiber optic grating sensor is used as a Level 1 sensor, and the preset minimum scheduling count is set to 3 times. When the building age exceeds 20 years, the corresponding fiber optic grating sensor is used as a Level 2 sensor, and the preset minimum scheduling count is 2 times. When the building age is less than 20 years, the fiber optic grating sensor is used as a Level 3 sensor, and the preset minimum scheduling count is 1 time. In each preset scheduling cycle, the Level 1 fiber optic grating sensor is scheduled to work at least 3 times, the Level 2 fiber optic grating sensor is scheduled to work at least 2 times, and the Level 3 fiber optic grating sensor is scheduled to work at least 1 time.

[0117] Set a preset maximum number of scheduling times and divide the data into multiple quantity ranges. Set a scheduling increment for each quantity range. For example, if the preset maximum number of scheduling times is set to 6, and the number of second fiber Bragg grating sensors whose sensing values ​​exceed the preset range within the preset area centered on the first fiber Bragg grating sensor is greater than 0 but not more than 5, then the preset increment is 1; if the number of second fiber Bragg grating sensors is greater than 5 but not more than 10, then the preset increment is 2; if the number of second fiber Bragg grating sensors is greater than 10 but not more than 15, then the preset increment is 3; and if the number of second fiber Bragg grating sensors is greater than 15 but not more than 20, then the preset increment is 4.

[0118] If there is a Level 1 fiber Bragg grating sensor with a preset minimum scheduling count of 3, and the sensing value of the Level 1 fiber Bragg grating sensor is within a preset range, and there are 8 second fiber Bragg grating sensors whose sensing values ​​exceed the preset range within a preset area centered on the Level 1 fiber Bragg grating sensor, then the corresponding preset increment is 2, and the first scheduling count is calculated to be 3 + 2 = 5, which does not exceed the preset maximum scheduling count of 6. Therefore, the Level 1 fiber Bragg grating sensor is scheduled 5 times in each preset scheduling cycle.

[0119] When the sensing value of the Level 1 fiber Bragg grating sensor is outside the preset range, the Level 1 fiber Bragg grating sensor is scheduled with a preset maximum number of scheduling times, that is, the Level 1 fiber Bragg grating sensor is scheduled 6 times in each preset scheduling cycle.

[0120] When scheduling each fiber Bragg grating sensor within a preset scheduling period, the optimal scheduling method is to distribute the scheduling times of each fiber Bragg grating sensor evenly within the preset scheduling period.

[0121] If two sensors are connected to the lower end of the OLT device, and the scheduling count of sensor 1 is 1 and the scheduling count of sensor 2 is 3, then the preset period is divided into 3 evenly distributed small periods. Sensor 2 is scheduled in the first and third small periods, and sensor 1 is scheduled in the second small period.

[0122] This implementation method, on the one hand, ensures that the sensing function does not affect the performance of the normal communication function by differentiating the number of fiber Bragg grating sensor schedulings. On the other hand, this implementation method also takes into account large-scale and regional natural disasters, and increases the number of schedulings of fiber Bragg grating sensors corresponding to buildings that may be at risk of large-scale collapse, so as to strengthen the monitoring of such buildings and ensure that disasters can be detected and responded to in a timely manner.

[0123] Example 2:

[0124] In practical applications, considering the positional arrangement of buildings and in conjunction with the method for monitoring building status described in Embodiment 1, this embodiment also provides a preferred implementation method for a specific scenario, specifically for the scheduling part of the fiber optic grating sensor in the method for monitoring building status.

[0125] like Figure 5 The diagram shows the building distribution within a residential community in a city. The buildings exhibit a relatively regular spatial distribution. When monitoring all buildings in this community, the scheduling of each fiber Bragg grating sensor can be achieved using the following method: Figure 6 As shown, it specifically includes:

[0126] In step 601, the buildings distributed in the same direction are sequentially ordered as Building 1, Building 2, ... Building N according to their distance from the optical module.

[0127] In step 602, a fiber Bragg grating sensor is installed in each building, wherein the sensing range of the fiber Bragg grating sensor installed in the Nth building covers all buildings from the 1st to the Nth building.

[0128] In step 603, when monitoring the building status, the fiber optic grating sensor of the Nth building is used to monitor all buildings in that direction, while other fiber optic grating sensors in that direction are not in operation.

[0129] In step 604, when the fiber Bragg grating sensor of the Nth building detects that the sensing value exceeds the preset range, other fiber Bragg grating sensors are then scheduled to work to determine the specific building location where the anomaly is detected.

[0130] As in Figure 5 In the shown community, fiber optic grating sensors can be installed and monitored for each row of buildings in the same direction, with the horizontal direction being the same.

[0131] This embodiment establishes a hierarchical monitoring network by comprehensively monitoring buildings in the same direction. When an anomaly is detected by the overall monitoring, specific anomalies are detected by sensors at lower levels. This method reduces the optical module resources required for monitoring when there are many densely packed buildings, preventing building monitoring from affecting the efficiency of normal data communication in the optical network. The anomaly refers to a sensor value that is outside the preset range. Since the sensing and monitoring areas of the fiber Bragg grating sensors are different, their preset ranges may also differ.

[0132] As a preferred implementation, based on this embodiment, there is also a method for determining the specific location of the building where the monitoring is abnormal. Specifically, in step 602 above, when installing a fiber optic grating sensor for each building, the sensing range of the fiber optic grating sensor installed in the nth building covers all buildings from the 1st to the nth building.

[0133] In this installation method, the method for determining the specific building location of the monitored anomaly specifically includes:

[0134] By dividing the area sequentially by midpoint, the sensing values ​​of the fiber optic grating sensor at the midpoint are used to determine the abnormal and normal areas, thereby narrowing down the abnormal area and achieving abnormal location. For example, if there are five buildings arranged in the same direction, and the fifth sensor detects an abnormal value, the third sensor is activated at the midpoint. If the third sensor's value is normal, the abnormal area is the fourth or fifth building; if the value is abnormal, the abnormal area is the first, second, or third building. Within the abnormal area, the sensor at the midpoint is used for further narrowing down the abnormal area until the abnormal building is identified.

[0135] Example 3:

[0136] After providing a method for monitoring the status of a building as described in Embodiments 1 and 2, the present invention will further provide a system for monitoring the status of a building, the system being used to implement the method for monitoring the status of a building as described in Embodiment 1 or Embodiment 2.

[0137] This embodiment applies the method described in Embodiment 1 or Embodiment 2 to the OLT device in an existing PON network used for communication. Building fiber Bragg grating sensors are installed at appropriate locations in the buildings requiring security monitoring. The sensors are connected to unused ports of the optical splitter via branch optical fibers and then to the OLT device, thereby forming a [structure / system]. Figure 7 The system shown is for detecting building status. If the optical splitter ports are insufficient, a secondary splitting mechanism, typically used in PON networks, is employed. This adds building monitoring functionality to a PON network used for everyday data communication.

[0138] According to the characteristics of fiber optic gratings, under normal circumstances, the grating reflects a specific wavelength. When external pressure or tension changes, the wavelength reflected by the grating will also change. By adopting an appropriate installation method, the external pressure or tension can be made to correspond to the deformation of the building, so that the wavelength reflected by the grating corresponds to the deformation of the building.

[0139] The operating wavelength of the selected fiber Bragg grating sensor is within the data communication wavelength range. The data communication wavelength range is the wavelength range of downlink light used for data communication in a PON optical network. When multiple grating sensors are installed at the lower end of the same OLT device, it is ensured that the preset reflection wavelength ranges of each grating sensor are staggered.

[0140] When the system is working, the wavelength of the downlink light from the OLT device scans and changes within the data communication wavelength range. When the downlink wavelength of the OLT device is tuned to the operating wavelength corresponding to the fiber Bragg grating sensor, the fiber Bragg grating sensor reflects the downlink light. The wavelength reflected by the grating sensor passes through the branch fiber and optical splitter, and is then transmitted to the OLT device along with the PON uplink wavelength on the trunk fiber. The OLT device performs wavelength division multiplexing on the uplink light from the ONU device and the reflected light from the fiber Bragg grating sensor by determining whether the uplink wavelength is consistent with the transmitted downlink wavelength, thereby not affecting the high-speed uplink data service.

[0141] When the downlink wavelength of the OLT device is not the same as the operating wavelength of the corresponding fiber Bragg grating sensor, the fiber Bragg grating sensor will not reflect the downlink light, and the OLT device will not receive the reflected wavelength.

[0142] However, in actual use, when the fiber Bragg grating sensor does not reflect the downlink light, a small amount of reflected light may still be generated due to poor fiber optic network connectors, nonlinear effects, etc. Since the optical power of these reflected lights is not large, the optical power received by the OLT device when the fiber Bragg grating sensor does not reflect the downlink light can be measured, and this type of reflected light can be filtered out based on the optical power.

[0143] Among them, such as Figure 8 As shown, the OLT device includes an optical module and control and computing resources. By opening and scheduling computing resources, the processing algorithm of the fiber Bragg grating sensor is deployed on the computing resources of the OLT device in the optical network. The OLT device uses the computing resources to calculate the sensing value according to the processing algorithm. The specific calculation process has been described in Example 1 and will not be repeated here.

[0144] Furthermore, by opening up and scheduling computing resources, an application for monitoring agencies can be deployed on the OLT device. The monitoring agency uses the data communication function of the optical network to obtain the sensing values ​​of the fiber Bragg grating sensor. The application is also used to send text messages to the monitoring management agency or residents of the building area to inform them of the building's status.

[0145] OLT hardware such as line cards and main control boards are equipped with CPU and other control and computing resources. By opening and scheduling computing resources, the processing algorithms of corresponding sensors and the application programs of monitoring agencies can be deployed on the computing resources of OLT to run and send text messages to the corresponding users.

[0146] This embodiment also provides an architecture at the system level for the optical modules included in the OLT device, such as... Figure 9 As shown, it specifically includes:

[0147] The optical module specifically includes a data transmission LD, a data reception PD, an optical path coupling unit, a processing unit, a sensor reception PD, and a wavelength control unit. The optical module and the communication equipment use a standard optical module device interface, which does not affect the original high-speed data transmission. The standard interface of the optical module also includes a serial management and control interface (usually I2C). In addition to transmitting the original management and control signals (which can be understood as the signals required for daily communication functions), the management and control interface will also transmit new transmission management and control information (which can be understood as signals involved in building monitoring, such as the sensing values ​​of fiber optic grating sensors sent to the monitoring agency).

[0148] The data transmission LD, data reception PD, optical path coupling unit, and processing unit are used for data communication in a passive optical network.

[0149] The data transmission LD uses a wavelength-tunable laser, such as a DBR wavelength-tunable laser.

[0150] The wavelength control unit is used to control the data transmission LD to send downlink light of the corresponding wavelength, so that the downlink light sent by the OLT device changes its scanning, and provides incident light for each fiber optic grating sensor at the lower end of the OLT device.

[0151] The optical path coupling unit is also used to couple the reflected light of the fiber Bragg grating sensor to the sensing receiver PD. Specifically, based on whether the uplink light and downlink light are consistent, it determines whether the uplink light is the reflected light of the fiber Bragg grating sensor or the uplink light of the ONU device, and couples the reflected light of the fiber Bragg grating sensor to the sensing receiver PD.

[0152] The sensor receiver PD is used to receive the reflected light from the fiber Bragg grating sensor and, based on the reflected light, feeds back the wavelength of the reflected light to the processing unit.

[0153] The processing unit is used to determine which fiber Bragg grating sensor the reflected light originates from based on the wavelength of the reflected light, and to calculate the sensing value of the fiber Bragg grating sensor.

[0154] While monitoring the building status, the processing module also calculates the number of times the fiber Bragg grating sensor is scheduled within a preset scheduling period based on the installation location and sensing value of the fiber Bragg grating sensor. The scheduling count is then sent to the wavelength control unit in the OLT optical module, which schedules the fiber Bragg grating sensor according to the scheduling count.

[0155] The optical module uses high-speed modulation information within the data communication wavelength range for data communication in the PON optical network, and uses reflected light power change information within the same data communication wavelength range for sensing detection of the fiber Bragg grating sensor (i.e., based on the received uplink light power, the wavelength of the uplink light is obtained, and the sensing value of the fiber Bragg grating sensor is calculated).

[0156] Due to the splitting ratio of a PON, in densely populated urban areas, the ONUs under a single OLT optical module are typically distributed within one or two buildings. Therefore, in such cases, placing one or two sensors under a single OLT optical module is sufficient to meet deployment requirements. Thus, wavelength-tunable lasers can be used with thermal tuning technology to reduce system costs. Figure 10 As shown, this embodiment also provides a specific implementation of an optical module with sensing processing capabilities. Since the transmission of XG(S)PON optical modules is usually implemented by an EML modulator-transmitter, the EML modulator-transmitter itself has TEC and optical wavelength control functions. By controlling the TEC through the processor, the temperature change of the DFB LD can be controlled, thereby changing the wavelength of the LD. At this time, the EAM can be compensated by the processing unit to compensate for the extinction ratio change caused by the wavelength change. At the same time, an optical circulator (CIR) and a sensor receiver (PD) are added to the optical module. The optical circulator distinguishes the transmitted downlink light from the reflected light, and the sensor receiver (PD) is used to receive the sensed reflected light.

[0157] The specific process of the system used for building monitoring in this embodiment is as follows:

[0158] The OLT device of the PON is started, and then the OLT device controls the downlink wavelength scanning change. When the wavelength is adjusted to the corresponding reflection wavelength of the building fiber optic grating sensor (which can be understood as the working wavelength in Example 1), the OLT device can receive the corresponding reflection wavelength.

[0159] The OLT device maps the downlink wavelength of the OLT to a specific fiber Bragg grating sensor, and then compares the initial reflection wavelength of the fiber Bragg grating sensor with the received actual reflection wavelength to calculate the relevant sensing value. The initial reflection wavelength of the fiber Bragg grating sensor refers to the wavelength of the test target in its initial state, such as the operating wavelength of the fiber Bragg grating sensor when it is not under stress before the initial installation of the building.

[0160] Finally, the relevant sensor values ​​are processed by algorithms and software deployed on the computing resources of the OLT device, and the monitoring agency or department conducts supervision through the network. OLT devices are usually installed in the operator's data center. The operator can package the computing resources of the OLT device into a resource container and deploy the monitoring agency's application on the OLT device to achieve rapid response.

[0161] All the above embodiments use the wavelength range of the downlink light of PON as the data communication wavelength range, and the operating wavelength of each fiber Bragg grating sensor is within the data communication wavelength range.

[0162] In practical applications, the wavelength range of the uplink light of the ONU device in the PON can also be used as the data communication wavelength range, and the operating wavelength of each fiber optic grating sensor is located within the data communication wavelength range.

[0163] At this point, a tunable laser with a wavelength within the ONU uplink wavelength range needs to be added to the OLT optical module that supports sensing capabilities. The sensing receiver PD can be shared with the data receiver PD, and sensing processing can be performed by averaging the RSSI changes of the data receiver PD. For optical modules with a built-in OTDR dedicated wavelength scheme, the wavelength of the OTDR can also be used as a sensor light source by employing a tunable laser.

[0164] When deploying this system, an existing PON network can be used. The optical modules of the original OLT equipment in the corresponding equipment room of the PON network can be replaced with the optical modules described in this embodiment. This replacement does not change the topology of the optical network, resulting in a shorter deployment cycle compared to the existing method of redeploying the sensor network. Furthermore, since this system combines building monitoring and data communication functions, the data communication function can be used to inform regulatory agencies of the building's status, enabling real-time response in emergency situations.

[0165] Example 4:

[0166] like Figure 11 The diagram shown is a schematic representation of the architecture of a device for monitoring building status according to an embodiment of the present invention. The device for monitoring building status in this embodiment includes one or more processors 21 and a memory 22. Figure 11 Take a processor 21 as an example.

[0167] Processor 21 and memory 22 can be connected via a bus or other means. Figure 11 Taking the example of a connection between China and Israel via a bus.

[0168] The memory 22, as a non-volatile computer-readable storage medium, can be used to store non-volatile software programs and non-volatile computer-executable programs, such as the method for monitoring building status in Embodiment 1. The processor 21 executes the method for monitoring building status by running the non-volatile software program and instructions stored in the memory 22.

[0169] Memory 22 may include high-speed random access memory, and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other non-volatile solid-state storage device. In some embodiments, memory 22 may optionally include memory remotely located relative to processor 21, which can be connected to processor 21 via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0170] The program instructions / modules are stored in the memory 22. When executed by one or more processors 21, they perform the methods for monitoring building status described in Embodiments 1, 2, and 3 above, for example, performing the methods described above. Figures 1-4 and Figure 6 The steps shown.

[0171] It is worth noting that the information interaction and execution process between the modules and units in the above-mentioned device and system are based on the same concept as the processing method embodiment of the present invention. For details, please refer to the description in the method embodiment of the present invention, and will not be repeated here.

[0172] Those skilled in the art will understand that all or part of the steps in the various methods of the embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, which may include: read-only memory (ROM), random access memory (RAM), magnetic disk or optical disk, etc.

[0173] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for monitoring the condition of a building, characterized in that, include: While performing data communication, the OLT device also provides incident light to the fiber Bragg grating sensor located at the lower end of the OLT device; the OLT device also receives reflected light from the fiber Bragg grating sensor, calculates the sensing value of the fiber Bragg grating sensor based on the wavelength of the reflected light, and monitors the status of the building corresponding to the fiber Bragg grating sensor based on the sensing value. While performing data communication, the OLT device also provides incident light to the fiber Bragg grating sensor located at the lower end of the OLT device. Specifically, the wavelength of the downlink light emitted by the OLT device scans and varies within the data communication wavelength range, thereby providing incident light to the fiber Bragg grating sensor while performing data communication. The data communication wavelength range is the wavelength range of the downlink light used for data communication in the PON optical network, and the operating wavelength of the fiber Bragg grating sensor is within the data communication wavelength range, so that incident light is provided to the fiber Bragg grating sensor through the data communication function of the OLT device. The wavelength of the downlink light emitted by the OLT device scans and varies within the data communication wavelength range, specifically including: If the sensing value of the fiber Bragg grating sensor exceeds the preset range, the scheduling count of the fiber Bragg grating sensor is set to the preset maximum scheduling count. If the sensing value of the fiber Bragg grating sensor is within a preset range, then the fiber Bragg grating sensor is used as the first fiber Bragg grating sensor, and the number of second fiber Bragg grating sensors whose sensing values ​​exceed the preset range within a preset area centered on the first fiber Bragg grating sensor is calculated. If no second fiber Bragg grating sensor exists, the minimum number of scheduling operations for the first fiber Bragg grating sensor is determined based on the age of the building corresponding to the first fiber Bragg grating sensor, and the number of scheduling operations for the first fiber Bragg grating sensor is set as the minimum number of scheduling operations. If a second fiber Bragg grating sensor exists, the scheduling increment corresponding to the number range of the second fiber Bragg grating sensor is selected based on the number range of the second fiber Bragg grating sensor, and the sum of the minimum number of scheduling operations and the scheduling increment is used as the first number of scheduling operations. If the first number of scheduling operations is greater than the preset maximum number of scheduling operations, the number of scheduling operations for the fiber Bragg grating sensor is set as the preset maximum number of scheduling operations; otherwise, the number of scheduling operations for the fiber Bragg grating sensor is set as the first number of scheduling operations. The OLT device schedules the transmission of incident light from each fiber Bragg grating sensor according to the number of times each fiber Bragg grating sensor is scheduled within each preset scheduling cycle.

2. The method for monitoring building status according to claim 1, characterized in that, The OLT device also receives reflected light from the fiber Bragg grating sensor, specifically including: When the OLT device receives uplink light, it determines whether the wavelength of the transmitted downlink light is consistent with the wavelength of the uplink light; if they are consistent, the OLT device considers the uplink light to be reflected light from the fiber optic grating sensor and receives the reflected light.

3. The method for monitoring building status according to claim 2, characterized in that, The step of calculating the sensing value of the fiber Bragg grating sensor based on the wavelength of the reflected light specifically includes: When the OLT device receives reflected light, it finds a preset reflection wavelength range that covers the wavelength of the reflected light based on the wavelength of the reflected light, and determines the corresponding fiber Bragg grating sensor based on the preset reflection wavelength range; wherein, multiple fiber Bragg grating sensors connected to the lower end of the same OLT device have different preset reflection wavelength ranges. The OLT device calculates the sensing value of the fiber Bragg grating sensor based on the fiber Bragg grating sensor and the wavelength of the reflected light.

4. The method for monitoring building status according to claim 3, characterized in that, The OLT device calculates the sensing value of the fiber Bragg grating sensor based on the fiber Bragg grating sensor and the wavelength of the reflected light, specifically including: The sensing value of the fiber Bragg grating sensor is calculated based on the difference between the initial reflection wavelength of the fiber Bragg grating sensor and the wavelength of the reflected light; wherein, the initial reflection wavelength is the wavelength of the reflected light corresponding to the fiber Bragg grating sensor when it is not under stress.

5. The method for monitoring building status according to claim 1, characterized in that, The method further includes: The OLT device uses its own data communication function to send the sensing value of the fiber optic grating sensor to the monitoring and management agency of the corresponding building and / or to notify the monitoring and management agency or residents of the status of the building.

6. A system for monitoring the status of a building, characterized in that, The system is used to implement the method for monitoring the status of a building as described in any one of claims 1-5.

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