Intelligent acousto-optic monitoring and alarming system for safety fence

Abstract

The invention relates to the technical field of monitoring and alarming, and discloses an intelligent acousto-optic monitoring and alarming system for a safety fence. According to the invention, multiple types of sensors such as infrared pyroelectric sensors, microwave radar sensors and the like are adopted to cooperate and acquire data in an omnibearing manner, so that misjudgment is reduced, the condition that a person approaches the fence is accurately monitored, and the problems that a single sensor is interfered by the environment and is insufficient in precision are solved; the data processing unit comprehensively evaluates the credibility of judgment of different sensors by applying a weighted average algorithm, so that an alarm instruction is scientifically generated, false alarm and missing alarm are avoided, and the alarm decision is more reliable; the sound-light alarm device starts high-intensity warning to forcefully deter approaching persons; a sound-light alarm mode can be dynamically adjusted according to the approaching speed and distance of people, an emergency high-frequency flickering and urgent alarm sound mode is switched when people approach quickly, otherwise, the original state is maintained, the device is flexible, practical and energy-saving, the warning effect is enhanced, and the safety of a protection area is comprehensively guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of monitoring and alarming, and in particular to an intelligent sound and light monitoring and alarming system for a safety fence. Background Art

[0002] In today's society, there are more and more scenarios that require regional isolation and protection, such as construction sites, factory areas, power facilities, military restricted areas, residential area boundaries, etc. Security fences are widely used as a basic protection facility. However, traditional security fences only play a physical blocking role, and lack effective active monitoring and early warning capabilities when facing potential security threats such as people trying to illegally climb over or approach.

[0003] On the one hand, some simple fences are not equipped with any intelligent monitoring equipment and rely entirely on manual patrols, which not only consumes a lot of manpower and material resources, but also has time intervals between patrols, making it difficult to detect abnormal people approaching in time. Once a safety accident occurs, the consequences are disastrous. For example, in large construction sites, the construction area is complex and the flow of personnel is frequent. If only manual regular inspections of fences are relied upon, lawless elements or unrelated personnel can easily approach dangerous construction areas during the inspection intervals, causing safety hazards.

[0004] On the other hand, some existing fence systems with monitoring functions have many defects. Some monitoring devices that use a single type of sensor, such as those that rely only on infrared sensing, are easily interfered by environmental factors. Under conditions of strong light exposure and abnormal temperature changes, the misjudgment rate is extremely high, and false alarms may be frequently issued, or information about people approaching may be missed in complex environments. Similarly, single microwave radar sensors also have limitations. When encountering areas with strong electromagnetic interference, such as near power facilities such as substations, their monitoring accuracy is greatly reduced, and they cannot accurately judge the dynamics of people.

[0005] To sum up, in order to meet the urgent needs of today's diverse places for intelligent, precise and efficient monitoring and early warning of safety fences, it is particularly necessary to develop an intelligent sound and light monitoring and alarm system for safety fences. Through the integration of multiple advanced technologies, it strives to overcome the many drawbacks of traditional fence monitoring and effectively ensure the safety of the protected area. Summary of the invention

[0006] The purpose of the present invention is to provide an intelligent sound and light monitoring and alarm system for a safety fence, which solves the technical problems raised in the background technology.

[0007] The purpose of the present invention can be achieved through the following technical solutions:

[0008] An intelligent sound and light monitoring and alarm system for a safety fence, comprising:

[0009] The sensor module uses multiple types of sensors to work together and obtain sensor data;

[0010] A data processing unit is used to fuse the received sensor data, and use a weighted average algorithm to comprehensively evaluate the credibility of the approach of people determined by different sensors, and determine whether to generate an alarm instruction based on the comprehensive evaluation results;

[0011] The sound and light alarm device is used to start the high-intensity sound and light warning function according to the alarm instruction received from the data processing unit.

[0012] As a further solution of the present invention: various types of sensors include but are not limited to infrared pyroelectric sensors and microwave radar sensors.

[0013] As a further solution of the present invention: the sensor data includes:

[0014] The data collected by the infrared pyroelectric sensor includes the output signal of the infrared pyroelectric sensor to the target. The output signal of the infrared pyroelectric sensor is marked as L i , where i=1, 2, ... n, i is the timestamp of the output signal, and n represents the number of timestamps;

[0015] The data collected by the microwave radar sensor includes the distance and speed between the microwave radar sensor and the target, which are recorded as D i and V i ; It processes the echo signal through the built-in fast Fourier transform algorithm and extracts the spectrum characteristics of the target, and then obtains D i and V i ;

[0016] As a further solution of the present invention: the sensor module is also used to output the signal L i Compare with the preset signal threshold Ly:

[0017] When L i >Ly, it is determined that a person has entered the corresponding sensing area;

[0018] When L i ≤Ly, it is determined that no person has entered the corresponding sensing area.

[0019] As a further solution of the present invention: the sensor module is also used to measure the distance D i Compare with the preset distance threshold Dy:

[0020] When D i <Dy, then according to V iDetermine whether the direction of the target movement is pointing inside the fence. When the direction of the target movement is pointing inside the fence, it is determined that a person has entered the corresponding sensing area, and the subsequent early warning process is triggered; otherwise, it is determined that no person has entered the corresponding sensing area, and the subsequent early warning process is not triggered.

[0021] As a further solution of the present invention, the method for determining whether the target movement direction is toward the inside of the fence is as follows:

[0022] Microwave radar sensors use the Doppler effect to measure the radial velocity of a target relative to the radar by emitting electromagnetic waves and receiving reflected waves;

[0023] When the target approaches the microwave radar sensor, the frequency of the received wave increases, and when the target moves away from the microwave radar sensor, the frequency of the received wave decreases;

[0024] The Doppler frequency shift formula is: d =(2×V i ) / g

[0025] Among them, f d is the Doppler shift, V i is the radial velocity of the target relative to the microwave radar sensor, g is the wavelength of the electromagnetic wave of the microwave radar sensor;

[0026] At the same time, combined with the fixed orientation of the microwave radar sensor installed on the fence support, the normal direction of the radar installation surface is used as the reference, and the inward velocity component is set as the positive direction;

[0027] If the resulting radial velocity value is positive, it means that the target is moving in the direction of the fence;

[0028] If the resulting radial velocity value is negative, it means the target is moving away from the fence.

[0029] As a further solution of the present invention: the comprehensive evaluation method is as follows:

[0030] Extract the preset credibility weight of infrared pyroelectric sensor and the credibility weight of microwave radar sensor, and mark them as Wa and Wb;

[0031] If the infrared pyroelectric sensor determines that a person is approaching, it will mark it as event A;

[0032] If the microwave radar sensor determines that a person is approaching, it will mark it as event B;

[0033] Then through: P = A × Wa + B × Wb

[0034] Obtain a comprehensive judgment value P;

[0035] Then the comprehensive judgment value P is compared with the pre-set judgment threshold PY:

[0036] If P>PY, it is determined that a high-credibility person is approaching a risk event, and an alarm instruction is generated, which is used to immediately drive the sound and light alarm device;

[0037] If P≤PY, no alarm instruction is generated, that is, the sound and light alarm device is not driven.

[0038] As a further solution of the present invention: wherein, the high-intensity sound and light warning function uses an ultra-bright LED strobe light that flashes at a specified frequency, and is simultaneously matched with a high-decibel buzzer to emit a continuous and piercing alarm sound.

[0039] As a further solution of the present invention: the sound and light alarm device also dynamically adjusts the sound and light alarm mode according to the speed and distance of the person approaching.

[0040] As a further solution of the present invention: the adjustment method of the sound and light alarm mode is as follows:

[0041] The measured distance D i The measured speed V is compared with the preset distance adjustment threshold DTy. i Compare with the preset speed adjustment threshold VTy:

[0042] When D i >DTy and V i >VTy, that is, the target is approaching fast and the target is close, then the sound and light alarm device will be switched to the emergency high-frequency flashing and rapid alarm sound mode, the LED flashing frequency will be increased to twice the original, and the buzzer tone will become sharper;

[0043] On the contrary, if the person approaches slowly or is still far away, the original alarm mode will be maintained.

[0044] Beneficial effects of the present invention:

[0045] The present invention adopts infrared pyroelectric sensors and microwave radar sensors to work together, which can obtain relevant data from different dimensions and determine whether a person is approaching by combining the information collected by each sensor. Compared with a single sensor, it can more accurately monitor the situation of people approaching the fence, reduce the possibility of misjudgment, and improve the accuracy of the judgment of the entire monitoring and alarm system.

[0046] The present invention uses a weighted average algorithm to comprehensively evaluate the credibility of the approach of people determined by different sensors, and scientifically and reasonably decides whether to generate an alarm instruction based on the preset weights and the comparison results between the comprehensive judgment value and the judgment threshold, thereby avoiding false alarms or missed alarms caused by inaccurate judgments of a single sensor, making the alarm decision more reliable and rigorous.

[0047] The sound and light alarm device of the present invention adopts an ultra-bright LED strobe light and flashes at a specified frequency, and is matched with a high-decibel buzzer to emit a continuous and piercing alarm sound. This high-intensity sound and light warning function can play a strong deterrent role when a person approaches to trigger the alarm, and can promptly remind relevant personnel and effectively prevent possible unsafe behaviors such as crossing the boundary.

[0048] According to the present invention, the sound and light alarm device can dynamically adjust the sound and light alarm mode according to the speed and distance of the person approaching. For example, when the target approaches quickly and at a close distance, it switches to an emergency high-frequency flashing and rapid alarm sound mode, while when the person approaches slowly or is still far away, it maintains the original alarm mode. It can flexibly respond to different scenarios according to actual conditions, making the alarm function more in line with actual needs, further improving the practicality and effectiveness of the system.

[0049] The present invention, through the combination of the above-mentioned multiple functions, the system can intelligently monitor and alarm the situation around the safety fence, and can be widely used in various places that require regional protection and safety assurance, effectively improving the safety of the place, preventing unauthorized persons from illegally entering a specific area, and better maintaining order and safety in the area. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The present invention will be further described below in conjunction with the accompanying drawings.

[0051] Figure 1 The present invention is a system block diagram of an intelligent sound and light monitoring and alarm system for a safety fence. DETAILED DESCRIPTION

[0052] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] Embodiment 1

[0054] See also Figure 1 As shown, the present invention is an intelligent sound and light monitoring and alarm system for safety fences, comprising:

[0055] The sensor module uses multiple types of sensors to work together and obtain sensor data;

[0056] Various types of sensors include but are not limited to infrared pyroelectric sensors and microwave radar sensors;

[0057] Among them, the infrared pyroelectric sensor is sensitive to the infrared rays of a specified wavelength emitted by the human body, and can accurately detect whether there is a person within its detection range; the microwave radar sensor uses the principle of electromagnetic wave reflection to detect the speed, distance and direction of the moving target. The two are installed complementary to each other at different heights and directions of the fence pillars to ensure all-round coverage of the area around the fence without blind spots;

[0058] For example, infrared pyroelectric sensors are installed at a height of 0.5 meters on the fence pillars every 2 meters to capture the information of stationary personnel at close range; microwave radar sensors are installed at a height of 1.5 meters to monitor targets at long distances and fast movement, ensuring that both slowly approaching maintenance personnel and unexpected intruders can be discovered in time;

[0059] Sensor data includes:

[0060] The data collected by the infrared pyroelectric sensor include: the output signal of the infrared pyroelectric sensor to the target, and the output signal of the infrared pyroelectric sensor is marked as L i , where i=1, 2, ... n, i is the timestamp of the output signal, and n represents the number of timestamps;

[0061] Then the output signal L i Compare with the preset signal threshold Ly:

[0062] When L i >Ly, it is determined that a person has entered the corresponding sensing area;

[0063] Among them, the signal threshold is set according to the experimental data of human infrared radiation intensity;

[0064] The data collected by the microwave radar sensor include: the distance and speed between the microwave radar sensor and the target, which are recorded as D i and V i ;

[0065] It processes the echo signal through the built-in fast Fourier transform algorithm and extracts the spectrum characteristics of the target, and then obtains D i and V i ;

[0066] Then the measured distance D i Compare with the preset distance threshold Dy:

[0067] The distance threshold is set according to the safety operation specifications of the substation equipment and the discharge distance requirements under different voltage levels, such as 1.5 meters for 110kV voltage level and 3 meters for 220kV;

[0068] When D i <Dy, then according to V iDetermine whether the target's movement direction points to the inside of the fence. If the target's movement direction points to the inside of the fence, the subsequent warning process is triggered;

[0069] Otherwise, the subsequent warning process will not be triggered;

[0070] The method for determining whether the target's movement direction is toward the inside of the fence is as follows:

[0071] Microwave radar sensors use the Doppler effect to measure the radial velocity of a target relative to the radar by emitting electromagnetic waves and receiving reflected waves;

[0072] When the target approaches the microwave radar sensor, the frequency of the received wave increases, and when the target moves away from the microwave radar sensor, the frequency of the received wave decreases;

[0073] The Doppler frequency shift formula is: d =(2×V i ) / g

[0074] Among them, f d is the Doppler shift, V i is the radial velocity of the target relative to the microwave radar sensor, g is the wavelength of the electromagnetic wave of the microwave radar sensor;

[0075] At the same time, combined with the fixed orientation of the microwave radar sensor installed on the fence support, the normal direction of the radar installation surface is used as the reference, and the inward velocity component is set as the positive direction;

[0076] If the obtained radial velocity value is positive, it means that the target is moving towards the inside of the fence;

[0077] If the radial velocity value obtained is negative, it means that the target is moving away from the fence;

[0078] Through this speed measurement and direction judgment mechanism based on the Doppler effect, it is possible to accurately determine whether the target is pointing inside the fence, thereby coordinating with the distance threshold judgment to trigger the subsequent early warning process, ensuring the accuracy of safety monitoring in the substation operation area;

[0079] The data processing unit uses a high-performance embedded processor with powerful data computing capabilities and fast response speed. It can process real-time data streams from multiple sensors at the same time. It has a large-capacity internal memory for data temporary storage and buffering to ensure the smoothness and real-time nature of data processing.

[0080] The data processing unit is used to perform fusion processing on the received sensor data and use the weighted average algorithm to comprehensively evaluate the credibility of the person approaching determined by different sensors;

[0081] The method is as follows:

[0082] Extract the preset credibility weight of infrared pyroelectric sensor and the credibility weight of microwave radar sensor, and mark them as Wa and Wb;

[0083] In this embodiment, Wa and Wb are verified through a large number of simulation tests and actual scenarios, combined with the false alarm rate and missed alarm rate of the two under different environmental interferences, and obtained through multiple iterations and optimizations. For example, in an environment with variable lighting, Wa=0.4 and Wb=0.6; when there is no obvious interference, Wa=0.3 and Wb=0.7;

[0084] If the infrared pyroelectric sensor determines that a person is approaching, it will mark it as event A;

[0085] If the microwave radar sensor determines that a person is approaching, it will mark it as event B;

[0086] Then through: P = A × Wa + B × Wb

[0087] Obtain a comprehensive judgment value P;

[0088] Then the comprehensive judgment value P is compared with the pre-set judgment threshold PY:

[0089] If P>PY, it is determined that a high-credibility person is approaching a risk event, and an alarm instruction is generated, which is used to immediately drive the sound and light alarm device;

[0090] Otherwise, no alarm instruction is generated, that is, the sound and light alarm device is not driven;

[0091] An audible and visual alarm device, used to quickly start a high-intensity audible and visual alarm function according to an alarm instruction received from a data processing unit;

[0092] Among them, the high-intensity sound and light warning function uses an ultra-bright LED strobe light, which flashes at a specified frequency to ensure that it is eye-catching even in a strong light environment; in this embodiment, the specified frequency is 60 times per minute;

[0093] At the same time, it is equipped with a high-decibel buzzer to emit a continuous and piercing alarm sound with a volume of more than 120 decibels. The transmission distance is long enough to cover the entire perimeter of the substation operation area, so that people approaching the dangerous area can immediately detect and stop moving forward;

[0094] This embodiment uses multiple types of sensors to work together, such as infrared pyroelectric sensors that are sensitive to infrared rays of a specified wavelength emitted by the human body and can accurately detect whether there are people within its detection range. Microwave radar sensors use the principle of electromagnetic wave reflection to detect the speed, distance and direction of moving targets. The two are installed at different heights and directions of the fence pillars to achieve all-round coverage of the fence surrounding area without dead angles. Whether it is a slowly approaching maintenance personnel or an unexpected intruder, they can be discovered in time. The data processing unit uses a high-performance embedded processor with powerful computing power and fast response speed. It can process multiple sensor real-time data streams at the same time, and integrates a large-capacity memory to ensure the smoothness and real-time nature of data processing. By using a weighted average algorithm to comprehensively evaluate the credibility of the approach of people determined by different sensors, combined with the pre-set sensor credibility weight and judgment threshold, it can accurately determine whether there is a high-credibility person approaching risk event, reduce false alarms and missed alarms, and ensure the accuracy of safety monitoring in the substation operation area. The sound and light alarm device uses an ultra-bright LED strobe light that flashes 60 times per minute, and is paired with a high-decibel buzzer to emit a continuous alarm sound with a volume of over 120 decibels. The transmission distance is long enough to cover the entire perimeter of the substation operation area, allowing personnel approaching the dangerous area to notice and stop moving forward in the first place, thus playing a good warning role.

[0095] In addition, in this embodiment, to facilitate daily maintenance and troubleshooting of the system, each sensor and key component is built with a unique electronic identification chip. Through the matching handheld intelligent inspection terminal, the staff can quickly scan the chip to read the equipment information, including model, production date, last maintenance time, etc., and can also obtain the current working status data of the component in real time, such as the signal strength of the sensor, the memory occupancy rate of the data processing unit, etc. Once an abnormality is found, the root cause of the problem can be accurately located in time, shortening the maintenance time and improving the safety and reliability of the substation area.

[0096] Embodiment 2

[0097] As the second embodiment of the present invention, when the present application is implemented, compared with the first embodiment, the technical solution of the present embodiment is different from the first embodiment only in that in the present embodiment, the sound and light alarm device also dynamically adjusts the sound and light alarm mode according to the speed and distance of the person approaching;

[0098] The specific method is as follows:

[0099] The measured distance D i The measured speed V is compared with the preset distance adjustment threshold DTy. i Compare with the preset speed adjustment threshold VTy:

[0100] When D i >DTy and V i>VTy, that is, the target is approaching fast and the target is close, then the sound and light alarm device will be switched to the emergency high-frequency flashing and rapid alarm sound mode, the LED flashing frequency will be increased to twice the original, that is, 120 times per minute, and the buzzer tone will become sharper to enhance the warning effect;

[0101] On the contrary, if the person approaches slowly or is still far away, the original alarm mode is maintained to reasonably allocate energy consumption while maintaining effective warning;

[0102] In this embodiment, based on the first embodiment, the sound and light alarm device can also dynamically adjust the sound and light alarm mode according to the speed and distance of the person approaching. When the target approaches quickly and at a close distance, the sound and light alarm device is switched to the emergency high-frequency flashing and rapid alarm sound mode to enhance the warning effect; when the person approaches slowly or at a far distance, the original alarm mode is maintained, which can reasonably allocate energy consumption and maintain effective warnings, making the alarm function more flexible and in line with the actual situation, and further improving the level of safety protection.

[0103] In addition, in this embodiment, when the sound and light alarm device switches to the emergency high-frequency flashing and rapid alarm sound mode, the system will automatically trigger the remote notification function. Through the built-in 4G communication module, the alarm information is pushed to the on-duty manager's mobile phone APP in real time in the substation area. The push content not only includes the alarm location and alarm type, such as personnel quickly approaching the dangerous area, but also comes with a screenshot of the real-time video surveillance screen on the scene, so that the manager can fully understand the on-site situation at the first time and make accurate emergency command decisions.

[0104] Embodiment 3

[0105] As the third embodiment of the present invention, when the present application is specifically implemented, compared with the first and second embodiments, the technical solution of this embodiment is to combine the solutions of the first and second embodiments mentioned above for implementation.

[0106] This embodiment combines the solutions of embodiment one and embodiment two to implement, integrating the advantages of the two, and can not only achieve accurate detection, scientific data processing and judgment, and effective routine warning reminders, but also has the function of dynamically adjusting the sound and light alarm mode according to the actual situation of people approaching, thereby comprehensively ensuring the safety of the substation operation area, making the entire safety fence intelligent sound and light monitoring and alarm system more complete and reliable, and can better respond to safety monitoring needs in different scenarios.

[0107] In addition, in this embodiment, when the intelligent sound and light monitoring and alarm system of the safety fence detects that a high-credibility person is approaching a risk event, in addition to activating the sound and light alarm itself, it can also send instructions to the surrounding high-definition cameras to automatically focus on the alarm area and store high-definition video to provide detailed information for subsequent event tracing; and it is linked with the electronic access control system. If it is determined that the intruder is an illegal intruder, the access control will be immediately locked to prevent the intruder from further entering the substation area, thereby building a strict safety protection network for the substation operation area in all directions.

[0108] The above formulas are all dimensionless and numerical calculations. The formula is a formula for the most recent real situation obtained by collecting a large amount of data and performing software simulation. The preset parameters and thresholds in the formula are set by technicians in this field according to actual conditions.

[0109] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. An intelligent sound and light monitoring and alarm system for safety fences, characterized in that: include: A sensor module is used to obtain sensor data measured by infrared pyroelectric sensors and microwave radar sensors; A data processing unit is used to fuse the received sensor data, and use a weighted average algorithm to comprehensively evaluate the credibility of the approach of people determined by different sensors, and determine whether to generate an alarm instruction based on the comprehensive evaluation results; The sound and light alarm device is used to start the high-intensity sound and light warning function according to the alarm instruction received from the data processing unit.

2. The intelligent sound and light monitoring and alarm system for safety fences according to claim 1 is characterized in that: Sensor data includes: The data collected by the infrared pyroelectric sensor includes the output signal of the infrared pyroelectric sensor to the target. The output signal of the infrared pyroelectric sensor is marked as L i , where i=1, 2, ... n, i is the timestamp of the output signal, and n represents the number of timestamps; The data collected by the microwave radar sensor includes the distance and speed between the microwave radar sensor and the target, which are recorded as D i and V i ; It processes the echo signal through the built-in fast Fourier transform algorithm and extracts the spectrum characteristics of the target, and then obtains D i and V i .

3. The intelligent sound and light monitoring and alarm system for safety fences according to claim 2 is characterized in that: The sensor module is also used to output the signal L i Compare with the preset signal threshold Ly: When L i >Ly, it is determined that a person has entered the corresponding sensing area; When L i ≤Ly, it is determined that no person has entered the corresponding sensing area.

4. The intelligent sound and light monitoring and alarm system for safety fences according to claim 3 is characterized in that: The sensor module is also used to measure the distance D i Compare with the preset distance threshold Dy: When D i <Dy, then according to V i Determine whether the target's movement direction points to the inside of the fence. If the target's movement direction points to the inside of the fence, it is determined that a person has entered the corresponding sensing area; Otherwise, it is determined that no person has entered the corresponding sensing area.

5. The intelligent sound and light monitoring and alarm system for safety fences according to claim 4 is characterized in that: in, Whether the target's movement direction is pointing inside the fence is determined as follows: Microwave radar sensors use the Doppler effect to measure the radial velocity of a target relative to the radar by emitting electromagnetic waves and receiving reflected waves; At the same time, combined with the fixed orientation of the microwave radar sensor installed on the fence support, the normal direction of the radar installation surface is used as the reference, and the inward velocity component is set as the positive direction; If the resulting radial velocity value is positive, it means that the target is moving in the direction of the fence; If the resulting radial velocity value is negative, it means the target is moving away from the fence.

6. The intelligent sound and light monitoring and alarm system for safety fences according to claim 5 is characterized in that: When the target approaches the microwave radar sensor, the frequency of the received wave increases, and when the target moves away from the microwave radar sensor, the frequency of the received wave decreases; The Doppler frequency shift formula is: d =(2×V i ) / g Among them, f d is the Doppler shift, V i is the radial velocity of the target relative to the microwave radar sensor, and g is the electromagnetic wave wavelength of the microwave radar sensor.

7. The intelligent sound and light monitoring and alarm system for safety fences according to claim 4 is characterized in that: The comprehensive evaluation method is as follows: Extract the preset credibility weight of infrared pyroelectric sensor and the credibility weight of microwave radar sensor, and mark them as Wa and Wb; If the infrared pyroelectric sensor determines that a person has entered the corresponding sensing area, it will mark it as event A; If the microwave radar sensor determines that a person has entered the corresponding sensing area, it will mark it as event B; Then through: P = A × Wa + B × Wb Obtain a comprehensive judgment value P; The comprehensive determination value P is then compared with a preset determination threshold value PY, and based on the comparison result, it is determined whether an alarm instruction is generated.

8. The intelligent sound and light monitoring and alarm system for safety fences according to claim 7 is characterized in that: If P>PY, an alarm instruction is generated; if P≤PY, no alarm instruction is generated.

9. The intelligent sound and light monitoring and alarm system for safety fences according to claim 1 is characterized in that: The sound and light alarm device also dynamically adjusts the sound and light alarm mode according to the speed and distance of the personnel.

10. The intelligent sound and light monitoring and alarm system for safety fences according to claim 9, characterized in that: The adjustment method of the sound and light alarm mode is as follows: The measured distance D i The measured speed V is compared with the preset distance adjustment threshold DTy. i Compare with the preset speed adjustment threshold VTy: When D i >DTy and V i >VTy, the sound and light alarm device will be switched to the emergency high-frequency flashing and rapid alarm sound mode; otherwise, the original alarm mode will be maintained.

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