Ground minimum illumination automatic inspection system for fire-fighting evacuation illumination in building

Abstract

The invention relates to the technical field of intelligent fire protection, and provides a building internal fire protection evacuation illumination ground minimum illumination automatic inspection system comprising a distributed light intensity sensing array composed of at least three groups of embedded sensing nodes; the illumination sensors are arranged in building evacuation aisles, places with dense people, evacuation staircases, front rooms or shared front rooms of the evacuation staircases, refuge aisles, front rooms of the refuge aisles and refuge floors, and are used for directly collecting ground horizontal illumination values E; and the central intelligent control unit is connected with the distributed light intensity sensing array through a duplex communication link, is provided with an inspection task scheduling module, a standard threshold storage module, a data comparison and diagnosis module and a trend analysis module, and is used for triggering an inspection task, receiving illumination data and executing threshold comparison and fault diagnosis. The inspection precision is improved through accurate acquisition and grading judgment, the response time is shortened by means of light attenuation pre-judgment and emergency linkage, the traditional inspection defects are overcome, and the reliability of evacuation illumination is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of smart fire protection technology, specifically to an automatic inspection system for the minimum illuminance of ground lighting in fire evacuation areas within buildings. Background Technology

[0002] With the rapid development of smart fire protection technology, building fire evacuation lighting systems are crucial facilities for guiding people to evacuate safely in emergencies such as fires, and their operational reliability is directly related to the safety of life and property. As buildings become larger and their structures more complex, whether the lighting illuminance at key nodes of evacuation routes meets the standards has become a core factor affecting evacuation efficiency and safety. Therefore, regular inspections of the minimum ground illuminance for fire evacuation lighting have become an important part of building fire protection management.

[0003] Currently, the inspection of ground illuminance for fire evacuation lighting largely relies on manual operation, using handheld illuminance meters to sample and measure at key points along the evacuation route. This method has significant limitations: firstly, manual inspections are time-consuming (usually monthly or quarterly), making it difficult to monitor the status of lighting equipment in real time, and sampling inspections are prone to missing key nodes, failing to achieve full path coverage; secondly, measurement results are easily affected by ambient light and human operating techniques, resulting in low data accuracy, and the lack of an effective correction mechanism for natural light illuminance leads to biases in illuminance determination. Furthermore, traditional inspections can only passively detect completely malfunctioning equipment, unable to predict the light decay trend of lighting equipment, and cannot quickly respond to and provide feedback on the availability of the lighting system in emergency situations, failing to meet the needs of real-time monitoring, early warning, and efficient linkage in smart fire protection. To address these technical problems, this application proposes an automatic inspection system for minimum ground illuminance of fire evacuation lighting in buildings. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides an automatic inspection system for minimum ground illuminance of fire evacuation lighting in buildings, which solves the problems of incomplete inspection coverage, low accuracy, lack of prediction, and insufficient emergency response.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an automatic inspection system for minimum ground illuminance of fire evacuation lighting in buildings, comprising: A distributed light intensity sensing array, consisting of at least three sets of embedded sensing nodes, is deployed in building evacuation corridors, densely populated areas, evacuation stairwells, anterooms or shared anterooms of evacuation stairwells, refuge corridors and their anterooms, and refuge floors to directly collect the ground horizontal illuminance value E. The central intelligent control unit is connected to the distributed light intensity sensor array via a full-duplex communication link. It is equipped with an inspection task scheduling module, a standard threshold storage module, a data comparison and diagnosis module, and a trend analysis module, which are used to trigger inspection tasks, receive illuminance data, and perform threshold comparison and fault diagnosis. The visualization interaction and alarm unit is used to display the system operating status, inspection results, and fault location information in real time, and output alarm signals through audible and visual alarms and hierarchical pop-up windows. The integrated power supply and communication unit provides stable power to all modules of the system and builds a redundant communication network to ensure the reliability of data transmission. An ambient light adaptive compensation unit includes an ambient light sensing module installed on the building's exterior wall or ventilation shaft to collect natural light illuminance values. This provides a basis for correcting illuminance data.

[0006] Preferably, the installation height H of the embedded sensing node is ≤0.12m, the photosensitive surface is tilted at an angle of 15°-30° to the ground and points towards the area to be measured, and it has a built-in high-precision silicon photodiode and a 16-bit analog-to-digital converter chip. The measurement range is 0.01lx-1000lx and the measurement error is ≤±3%.

[0007] Preferably, the embedded sensing node also integrates a data preprocessing module, which performs noise reduction on the original illuminance data using a moving average filtering algorithm. The processing formula is as follows: ; Where n is the length of the filtering window, and its value is 5 ≤ ​​n ≤ 10. The processed data, consisting of n sets of continuously collected raw data, is transmitted to the central intelligent control unit via the integrated power supply and communication unit.

[0008] Preferably, the standard threshold storage module stores standard thresholds for the lowest ground brightness corresponding to multiple evacuation zones. ,in: Evacuation corridors and densely populated areas: ; Escape stairwells, anterooms or shared anterooms of evacuation stairwells, refuge corridors and their anterooms, refuge floors, refuge rooms, and dedicated fire escape routes: ; Other locations: ; The data comparison and diagnosis module will display the real-time illuminance value. Compensated values ​​and corresponding regions Comparison, when If the condition is deemed abnormal, the safety factor k satisfies 0.85≤k≤0.95.

[0009] Preferably, the trend analysis module analyzes the illuminance value sequence from N consecutive inspections of the same sensor node. Perform a polynomial fitting, and the fitting equation is: ; Where t is the inspection number sequence number, and the coefficient of the first term... and ,when At that time, it was determined that the light decay was too fast, triggering a warning signal.

[0010] Preferably, the integrated power supply and communication unit adopts a POE+ bus architecture, providing both 48VDC power supply and gigabit Ethernet communication. The communication protocol is compatible with the GB / T28181 fire communication standard, with a bus redundancy of ≥99.9%, and supports automatic reconnection and data retransmission after disconnection.

[0011] Preferably, the visualization interaction and alarm unit includes a touch-screen monitoring terminal in the fire control room. The terminal has a built-in 3D electronic map of the building, supports zoom and roaming functions, marks the status of sensor nodes with different colored icons, and allows users to click to view the illuminance change curve of the node over the past 30 days.

[0012] Preferably, the compensation algorithm of the ambient light adaptive compensation unit is as follows: ; in The original illuminance value is measured by a distributed light intensity sensing array, and α is the ambient light influence coefficient, with a value of 0.9 ≤ α ≤ 1.0. When α is set to 0, no compensation is required.

[0013] Preferably, it also includes a linkage control unit that is connected to the building fire alarm system. When a fire alarm signal is detected, it automatically shortens the inspection cycle to 1 / 5 of the original cycle and prioritizes the inspection of key nodes in evacuation routes. At the same time, it feeds back the availability assessment results of the emergency lighting system to the building fire alarm system.

[0014] An automatic inspection method for minimum floor brightness of fire evacuation lighting in buildings includes the following steps: Step 1: The central intelligent control unit initiates timed inspections through the task scheduling module. The period T is adjustable from 1h to 24h or it receives external trigger commands to initialize the inspection parameters. Step 2: Send wake-up commands to each embedded sensor node through the integrated power supply and communication unit, and synchronously transmit the current ambient light compensation coefficient α; Step 3: The embedded sensor node responds to commands, collects n sets of raw illuminance data, performs filtering, and calculates... The data is then transmitted back to the central intelligent control unit. Step 4: The central intelligent control unit obtains ambient light adaptive compensation unit data. ,calculate and in combination with the corresponding regions Perform multi-level comparisons: S1, if This is considered normal. S2, if The system was determined to be under-illuminated, triggering a level 2 alarm. S3, if The system is determined to be completely ineffective, triggering a Level 1 alarm. Simultaneously perform trend analysis; if the light decay condition is met, trigger an early warning. Step 5: The visualization interaction and alarm unit updates the node status and alarm information, and the emergency linkage control unit feeds back the evaluation results to the building fire alarm system as needed; Step Six: The data storage module saves the data from this inspection. , The inspection task is completed upon receiving the diagnosis results and timestamp.

[0015] This invention provides an automatic inspection system for minimum ground illuminance in fire evacuation lighting within buildings. It offers the following advantages: 1. This invention employs a distributed light intensity sensor array with embedded nodes installed at a height ≤0.12m, collecting ground illuminance at close range with an tilt angle of 15°-30°. Combined with high-precision silicon photodiodes and a 16-bit analog-to-digital converter chip, the measurement error is ≤±3%. Noise reduction is achieved through a moving average filtering algorithm, combined with an ambient light adaptive compensation algorithm, dynamically adjusting the α coefficient to correct data based on natural light illuminance, effectively eliminating ambient light interference. Simultaneously, three illuminance threshold levels (1.0Lx, 3.0Lx, and 10.0Lx) are set according to area type, along with an anomaly judgment standard of 0.85-0.95 safety factor, accurately distinguishing between normal, insufficient brightness, and complete failure states, thus solving the problems of low accuracy and susceptibility to environmental influences in traditional inspection methods.

[0016] 2. This invention, by incorporating a trend analysis module, performs polynomial fitting on N consecutive inspection data of the same node, enabling early identification of rapid light decay issues in lighting equipment and triggering warnings, thus achieving fault prediction. The linkage control unit is linked in real-time with the fire alarm system; during a fire alarm, the inspection cycle is automatically shortened to 1 / 5 of the original cycle, prioritizing inspections of key nodes in evacuation routes, completing the inspection of the core area within 5 minutes and providing feedback on emergency lighting availability assessment results. The visualization terminal marks node status on a 3D electronic map and supports viewing 30-day illuminance curves, facilitating rapid fault location and overcoming the shortcomings of traditional inspections that passively discover faults and have delayed emergency responses. Attached Figure Description

[0017] Figure 1 This is a flowchart of the present invention; Figure 2 This is a diagram of the central intelligent control unit of the present invention; Figure 3 This is a diagram of the visualization, interaction, and alarm unit of the present invention. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Example: Please see the appendix Figure 1 - Appendix Figure 3 This invention provides an automatic inspection system for minimum ground illuminance of fire evacuation lighting in buildings, comprising: A distributed light intensity sensing array, consisting of at least three sets of embedded sensing nodes, is deployed in key locations such as building evacuation corridors, densely populated areas, evacuation stairwells, anterooms or shared anterooms of evacuation stairwells, refuge corridors and their anterooms, and refuge floors, within a 3-meter radius. It is used to directly collect the ground horizontal illuminance value E. The installation height H of the embedded sensing nodes is ≤0.12m, and the photosensitive surface is tilted at a 15°-30° angle to the ground towards the area to be measured. It incorporates a high-precision silicon photodiode and a 16-bit analog-to-digital converter chip, with a measurement range of 0.01lx—1000lx and a measurement error ≤±3%. The embedded sensing nodes also integrate a data preprocessing module, which uses a moving average filtering algorithm to reduce noise in the raw illuminance data. The processing formula is as follows: ; Where n is the length of the filtering window, and its value is 5 ≤ ​​n ≤ 10. The data consists of n sets of continuously collected raw data, and the processed data is transmitted to the central intelligent control unit through an integrated power supply and communication unit. Specifically, this embodiment is designed for a 10-story office building. A distributed light intensity sensing array deploys 28 sets of embedded sensing nodes: 2 sets at each turn in the evacuation corridor on each floor, 1 set at the start of the ramp connecting the elevator lobby and the evacuation stairwell on each floor, and 2 sets within 3 meters of each of the two safety exits on each floor. All embedded sensing nodes are encased in a stainless steel waterproof shell, with a uniform installation height of 0.1m (satisfying H≤0.12m). The photosensitive surface is tilted at a 20° angle to the ground, pointing directly forward to the evacuation ground area to be measured 1m away (this area is the main area trampled during evacuation). Each node incorporates an S1086 high-precision silicon photovoltaic cell (spectral response range...). Measuring 380nm-780nm (compatible with emergency lighting LED light sources) and using the ADS1115 16-bit analog-to-digital converter chip, the measurement range covers 0.01lx-1000lx, with the measurement error controlled within ±2.5% after calibration. In the data preprocessing module, the moving average filter window length n is set to 8. Each node collects one set of raw illuminance data every 10ms. After collecting 8 sets, filtering calculations are performed. For example, if the 8 sets of raw data collected are 1.82lx, 1.85lx, 1.79lx, 1.83lx, 1.81lx, 1.84lx, 1.78lx, and 1.82lx, after calculation... Finally, the filtered value is used as The data is transmitted to the central intelligent control unit via an integrated power supply and communication unit.

[0020] Please see the appendix Figure 1 - Appendix Figure 3 The central intelligent control unit is connected to the distributed light intensity sensor array via a full-duplex communication link. It is equipped with an inspection task scheduling module, a standard threshold storage module, a data comparison and diagnosis module, and a trend analysis module. These modules are used to trigger inspection tasks, receive illuminance data, perform threshold comparisons, and perform fault diagnosis. The standard threshold storage module stores the minimum ground brightness standard thresholds corresponding to multiple evacuation zones. ,in: Evacuation corridors and densely populated areas: ; Escape stairwells, anterooms or shared anterooms of evacuation stairwells, refuge corridors and their anterooms, refuge floors, refuge rooms, and dedicated fire escape routes: ; Other locations: ; The data comparison and diagnostic module will compare the real-time illuminance values. Compensated values ​​and corresponding regions Comparison, when If an anomaly is detected, the safety factor k satisfies 0.85 ≤ k ≤ 0.95. The trend analysis module analyzes the illuminance value sequence from N consecutive inspections of the same sensor node. Perform a polynomial fitting, and the fitting equation is: ; Where t is the inspection number sequence number, and the coefficient of the first term... and ,when When the light decays too rapidly, a warning signal is triggered. Specifically, in this embodiment, the central intelligent control unit uses an Intel Core i5-12400 processor running a Linux operating system. The inspection task scheduling module is implemented using C language programming, supporting four adjustable timed inspection cycles: 1 hour, 6 hours, 12 hours, and 24 hours, with a default setting of 6 hours per cycle. The standard threshold storage module has a built-in SQLite database, storing multi-level thresholds optimized for the actual office building scenario: evacuation corridors and densely populated areas. Evacuation stairwells, anterooms or shared anterooms of evacuation stairwells, refuge corridors and their anterooms, refuge floors, refuge rooms, and dedicated fire escape routes are corresponding to these. Other locations correspond The safety factor k is uniformly set to 0.9 (balancing safety and false alarm rate); in the trend analysis module, N is set to 30 times (i.e., 30 consecutive inspection data, corresponding to 7.5 days of data under the default 6-hour inspection cycle); polynomial fitting is implemented using the least squares method, for example, the data from 30 consecutive inspections of a sensor node at a safety exit. The equation is obtained after fitting the sequence. The coefficient of the first term ,and If the light decay of the emergency lighting fixtures corresponding to the node is determined to be too rapid, a light decay warning signal will be immediately triggered.

[0021] Please see the appendix Figure 1 - Appendix Figure 3 The visualization interaction and alarm unit is used to display the system operation status, inspection results, and fault location information in real time, and output alarm signals through audible and visual alarms and hierarchical pop-up windows. The visualization interaction and alarm unit includes a touch-screen monitoring terminal in the fire control room. The terminal has a built-in 3D electronic map of the building, supports zoom and roaming functions, marks the status of sensor nodes with different colored icons, and allows users to click to view the illuminance change curve of the node over the past 30 days. Specifically, in this embodiment, the visualization interaction and alarm unit uses a 21.5-inch industrial-grade touch screen monitoring terminal (model: Advantech TPC-2151T). The terminal has a built-in 3D electronic map of the office building developed based on Unity3D. The map includes detailed information such as evacuation routes for each floor, sensor node installation locations, and emergency lighting fixture locations. The node status labeling rules are as follows: a green circular icon indicates normal operation, a yellow triangle icon indicates a warning (rapid light decay), and a red square icon indicates a fault (insufficient brightness or complete failure). The current status is indicated next to the icon. Numerical values; supports mouse wheel zoom and drag-and-drop navigation; double-clicking any node icon will bring up a details window displaying the node's device number, installation location, and data for the past 30 days. Change curves and historical inspection records; The sound and light alarm device adopts the Haiwan GST-HX-M8501 fire sound and light alarm. When the first level alarm (complete failure) occurs, it emits a flashing red light and a 110dB high-decibel intermittent alarm sound. When the second level alarm (insufficient brightness) occurs, it emits a flashing yellow light and a 80dB low-decibel continuous alarm sound. When the warning (light decay is too fast) occurs, it emits a solid blue light and a 60dB prompt sound. At the same time, a graded pop-up window appears on the terminal, showing the location of the fault node, the fault type and handling suggestions.

[0022] Please see the appendix Figure 1 - Appendix Figure 3 The integrated power supply and communication unit provides stable power to all modules of the system and builds a redundant communication network to ensure the reliability of data transmission. The integrated power supply and communication unit adopts a POE+ bus architecture and provides DC48V power supply and gigabit Ethernet communication. The communication protocol is compatible with GB / T28181 fire communication standard, the bus redundancy is ≥99.9%, and it supports automatic reconnection and data retransmission after disconnection. Specifically, in this embodiment, the integrated power supply and communication unit uses the Huawei S5735-L48P4X-POE+ switch as the core device. This switch supports 48 POE+ ports and can simultaneously provide DC 48V power to 28 sets of embedded sensor nodes, ambient light sensor modules, monitoring terminals, and other devices (single-port power supply can reach 30W, meeting the power supply needs of all devices). It also establishes redundant communication links through four 10GE optical ports. The communication protocol adopts a fire-fighting dedicated communication protocol based on the GB / T28181-2016 standard extension. The transmission uses a CRC-32 check mechanism to ensure data integrity; the bus redundancy design adopts a ring topology structure, and when a section of the bus experiences a disconnection failure, the system can automatically switch to the backup link, with a disconnection reconnection time of ≤3s. Actual testing shows that the bus redundancy reaches 99.92%; the data retransmission function supports nodes to automatically upload the inspection data that was not transmitted during the disconnection period after the disconnection is restored, ensuring that historical data is not lost. For example, if an embedded sensor node is disconnected for 2 hours due to a loose bus (during which it underwent 2 inspections), the retransmission of the 2 inspection data will be completed within 10s after the disconnection is restored.

[0023] Please see the appendix Figure 1 - Appendix Figure 3 An ambient light adaptive compensation unit includes an ambient light sensing module installed on the building's exterior wall or ventilation shaft to collect natural light illuminance values. To provide a basis for illuminance data correction, the compensation algorithm of the ambient light adaptive compensation unit is as follows: ; in The original illuminance value is measured by a distributed light intensity sensing array, and α is the ambient light influence coefficient, with a value of 0.9 ≤ α ≤ 1.0. When this happens, α is automatically set to 0, requiring no compensation. Specifically, in this embodiment, the ambient light adaptive compensation unit uses two sets of TSL2591 high-precision ambient light sensor modules, which are installed next to the skylights on the east and west exterior walls of the office building (avoiding direct sunlight and ensuring that the collected data is diffused natural light illuminance). The module's measurement range is 0.001 lx—8388608 lx, and the sampling frequency is synchronized with the inspection cycle (6 hours / time). The ambient light influence coefficient α is set to 0.92 based on the light transmittance of the office building's window glass (measured at 92%) (satisfying 0.9≤α≤1.0). For example, during a daytime inspection, the ambient light sensor module collects... Data collected from a typical evacuation corridor node After compensation calculation (At this point, the system is identified as having a calculation error and automatically corrects it using the average of historical data after compensation, avoiding calculation deviations caused by excessive natural light); During a nighttime inspection, α is automatically set to 0, for a certain safety exit node. ,but .

[0024] Please see the appendix Figure 1 - Appendix Figure 3 It also includes a linkage control unit that communicates with the building fire alarm system. When a fire alarm signal is detected, it automatically shortens the inspection cycle to 1 / 5 of the original cycle and prioritizes the inspection of key nodes in evacuation routes. At the same time, it feeds back the availability assessment results of the emergency lighting system to the building fire alarm system. Specifically, in this embodiment, the linkage control unit uses an RS-485 interface to connect with the existing Haiwan GST200 fire alarm system in the office building. The communication protocol adopts the Modbus-RTU protocol (compatible with the FAS system interface standard). Under normal conditions, the inspection cycle is 6 hours. When the FAS system detects a fire on a certain floor (e.g., the 5th floor) and issues an alarm signal, the linkage control unit immediately receives the alarm signal, shortening the inspection cycle to 6 hours × 1 / 5 = 72 minutes. At the same time, it triggers the priority inspection mode, prioritizing the inspection of all sensor nodes on the 5th floor (3 groups in total) and the evacuation stairwells and safety exit nodes on the adjacent 4th and 6th floors (2 groups each). The priority inspection completion time is ≤ 5 minutes. After the inspection is completed, the linkage control unit feeds back the emergency lighting system availability assessment results to the FAS system. The assessment results include information such as "number of normal nodes, number of warning nodes, number of faulty nodes, location of faulty nodes, and overall availability of the emergency lighting system". For example, the feedback information is "92% availability of the emergency lighting system on the 5th floor, and insufficient brightness of one group of ordinary evacuation passage nodes (…)". "It is recommended to replace the corresponding lights in a timely manner" to provide data support for fire command decision-making in the fire alarm system.

[0025] Please see the appendix Figure 1 - Appendix Figure 3 An automatic inspection method for minimum floor brightness of fire evacuation lighting in buildings includes the following steps: Step 1: The central intelligent control unit initiates timed inspections (adjustable period T=1h-24h) through the task scheduling module or receives external trigger commands to initialize inspection parameters; Step 2: Send wake-up commands to each embedded sensor node through the integrated power supply and communication unit, and synchronously transmit the current ambient light compensation coefficient α; Step 3: The embedded sensor node responds to commands, collects n sets of raw illuminance data, performs filtering, and calculates... The data is then transmitted back to the central intelligent control unit. Step 4: The central intelligent control unit obtains ambient light adaptive compensation unit data. ,calculate and in combination with the corresponding regions Perform multi-level comparisons: S1, if This is considered normal. S2, if The system was determined to be under-illuminated, triggering a level 2 alarm. S3, if The system is determined to be completely ineffective, triggering a Level 1 alarm. Simultaneously perform trend analysis; if the light decay condition is met, trigger an early warning. Step 5: The visualization interaction and alarm unit updates the node status and alarm information, and the emergency linkage control unit feeds back the evaluation results to the building fire alarm system as needed; Step Six: The data storage module saves the data from this inspection. , The inspection task is completed upon receiving the diagnosis results and timestamp.

[0026] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An automatic inspection system for minimum illuminance of ground lighting in fire evacuation areas within buildings, characterized in that, include: A distributed light intensity sensing array, consisting of at least three sets of embedded sensing nodes, is deployed in evacuation corridors, densely populated areas, evacuation stairwells, anterooms or shared anterooms of evacuation stairwells, refuge corridors and their anterooms, and refuge floors of building fire evacuation routes to directly collect the ground horizontal illuminance value E. The central intelligent control unit is connected to the distributed light intensity sensor array via a full-duplex communication link. It is equipped with an inspection task scheduling module, a standard threshold storage module, a data comparison and diagnosis module, and a trend analysis module, which are used to trigger inspection tasks, receive illuminance data, and perform threshold comparison and fault diagnosis. The visualization interaction and alarm unit is used to display the system operating status, inspection results, and fault location information in real time, and output alarm signals through audible and visual alarms and hierarchical pop-up windows. The integrated power supply and communication unit provides stable power to all modules of the system and builds a redundant communication network to ensure the reliability of data transmission. An ambient light adaptive compensation unit includes an ambient light sensing module installed on the building's exterior wall or ventilation shaft to collect natural light illuminance values. This provides a basis for correcting illuminance data.

2. The automatic inspection system for minimum ground illuminance of fire evacuation lighting in buildings according to claim 1, characterized in that, The embedded sensing node has an installation height H≤0.12m, and the photosensitive surface is tilted at a 15°-30° angle to the ground towards the area to be measured. It has a built-in high-precision silicon photodiode and a 16-bit analog-to-digital converter chip, with a measurement range of 0.01lx-1000lx and a measurement error ≤±3%.

3. The automatic inspection system for minimum ground illuminance of fire evacuation lighting in buildings according to claim 2, characterized in that, The embedded sensing node also integrates a data preprocessing module, which performs noise reduction on the raw illuminance data using a moving average filtering algorithm. The processing formula is as follows: ； Where n is the length of the filtering window, and its value is 5 ≤ ​​n ≤ 10. The processed data, consisting of n sets of continuously collected raw data, is transmitted to the central intelligent control unit via the integrated power supply and communication unit.

4. The automatic inspection system for minimum illuminance of ground lighting in fire evacuation areas within a building according to claim 1, characterized in that, The standard threshold storage module stores standard thresholds for minimum ground brightness with multiple levels of relief. ,in: Evacuation corridors and densely populated areas: ; Escape stairwells, anterooms or shared anterooms of evacuation stairwells, refuge corridors and their anterooms, refuge floors, refuge rooms, and dedicated fire escape routes: ; Other locations: ; The data comparison and diagnosis module will display the real-time illuminance value. Compensated values ​​and corresponding regions Comparison, when If the condition is deemed abnormal, the safety factor k satisfies 0.85≤k≤0.

95.

5. The automatic inspection system for minimum illuminance of ground lighting in fire evacuation areas within a building according to claim 4, characterized in that, The trend analysis module analyzes the illuminance value sequence from N consecutive inspections of the same sensing node. Perform a polynomial fitting, and the fitting equation is: ; Where t is the inspection number sequence number, and the coefficient of the first term... and ,when At that time, it was determined that the light decay was too fast, triggering a warning signal.

6. The automatic inspection system for minimum illuminance of ground lighting in fire evacuation areas within a building according to claim 1, characterized in that, The integrated power supply and communication unit adopts a POE+ bus architecture, providing both 48VDC power supply and gigabit Ethernet communication. The communication protocol is compatible with the GB / T28181 fire communication standard, with a bus redundancy of ≥99.9%, and supports automatic reconnection and data retransmission after disconnection.

7. The automatic inspection system for minimum ground illuminance of fire evacuation lighting in buildings according to claim 1, characterized in that, The visualization interaction and alarm unit includes a touch-screen monitoring terminal in the fire control room. The terminal has a built-in 3D electronic map of the building, supports zoom and roaming functions, marks the status of sensor nodes with different colored icons, and allows users to click to view the illuminance change curve of the node over the past 30 days.

8. The automatic inspection system for minimum illuminance of ground lighting in fire evacuation areas within a building according to claim 1, characterized in that, The compensation algorithm of the ambient light adaptive compensation unit is as follows: ； in The original illuminance value is measured by a distributed light intensity sensing array, and α is the ambient light influence coefficient, with a value of 0.9 ≤ α ≤ 1.

0. When α is set to 0, no compensation is required.

9. The automatic inspection system for minimum illuminance of ground lighting in fire evacuation areas within a building according to claim 1, characterized in that, It also includes a linkage control unit that communicates with the building's fire alarm system. When a fire alarm signal is detected, it automatically shortens the inspection cycle to 1 / 5 of the original cycle and prioritizes the inspection of key nodes in evacuation routes. At the same time, it feeds back the availability assessment results of the emergency lighting system to the building's fire alarm system.

10. A method for automatically inspecting the minimum illuminance of floor lighting for fire evacuation lighting in buildings, using any one of the automatic inspection systems for minimum illuminance of floor lighting for fire evacuation lighting in buildings as described in claims 1-9, characterized in that, Includes the following steps: Step 1: The central intelligent control unit initiates timed inspections through the task scheduling module. The period T is adjustable from 1h to 24h or it receives external trigger commands to initialize the inspection parameters. Step 2: Send wake-up commands to each embedded sensor node through the integrated power supply and communication unit, and synchronously transmit the current ambient light compensation coefficient α; Step 3: The embedded sensor node responds to commands, collects n sets of raw illuminance data, performs filtering, and calculates... The data is then transmitted back to the central intelligent control unit. Step 4: The central intelligent control unit obtains ambient light adaptive compensation unit data. ,calculate and in combination with the corresponding regions Perform multi-level comparisons: S1, if This is considered normal. S2, if The system was determined to be under-brightness, triggering a level 2 alarm. S3, if The system is determined to be completely ineffective, triggering a Level 1 alarm. Simultaneously perform trend analysis; if the light decay condition is met, trigger an early warning. Step 5: The visualization interaction and alarm unit updates the node status and alarm information, and the emergency linkage control unit feeds back the evaluation results to the building fire alarm system as needed; Step Six: The data storage module saves the data from this inspection. , The inspection task is completed upon receiving the diagnosis results and timestamp.

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