Omni-directional field strength vector monitoring near electric alarm safety helmet and alarm method

Abstract

The application discloses a near electric field alarm safety helmet and an alarm method for omnidirectional field intensity vector monitoring, and relates to the field of electric power safety protection. The safety helmet comprises an omnidirectional field intensity sensing array, a vector field signal processing module and an alarm module which are assembled on a safety helmet body. The omnidirectional field intensity sensing array comprises at least five electric field sensors which are arranged on the top of the safety helmet body and around the brim of the safety helmet body. The vector field signal processing module is used for acquiring electric field intensity components collected by the electric field sensors, and performing vector synthesis on the electric field intensity components to determine the spatial electric field intensity and the field source direction. The spatial electric field intensity is compared with preset safety threshold values and critical threshold values respectively to determine the alarm level of the position where the safety helmet is located. The alarm module is used for outputting corresponding alarm prompts according to the alarm level. The spatial electric field intensity and the field source direction are determined by synthesizing electric field intensity components in different directions, thereby solving the problem that the electric field detection result of the existing safety helmet is inaccurate.

Description

Technical Field

[0001] This invention relates to the field of power safety protection, specifically to a proximity alarm safety helmet and alarm method for omnidirectional field strength vector monitoring. Background Technology

[0002] In power field operations such as substation maintenance, high-voltage line inspection, and power distribution construction, safety helmets are essential protective equipment for workers. Traditional safety helmets only provide physical protection such as impact protection and cannot detect the high-voltage electric field in the surrounding environment. To address this, the industry has developed proximity alarm safety helmets that integrate electric field sensors to provide hazard warnings. However, existing products generally suffer from the core defect of inaccurate electric field detection results, leading to a series of safety problems such as missed alarms, false alarms, and inability to locate hazard sources.

[0003] For example, most existing equipment uses a single-sensor, single-point scalar detection scheme, which can only collect electric field strength values ​​in a single direction, losing information about the electric field vector direction. Detection accuracy is severely limited by the sensor's orientation. Since an electric field is a vector physical quantity with both magnitude and direction, when a live device is located behind or to the side of the sensor's sensing surface, the sensor's amplitude is significantly attenuated. Even if personnel are close to the high-voltage equipment, the detected field strength is still far below the true value, easily leading to missed alarms and directly causing distorted and inaccurate detection results.

[0004] For example, some multi-sensor products only determine the threshold values ​​of each sensor independently without performing spatial vector synthesis processing, thus failing to eliminate directional coupling errors between the sensor and the field source. Such devices simply compare the values ​​collected by a single sensor with the safety threshold, without integrating multi-directional electric field component correction and detection data. In the complex electric field environment of multiple live devices in a substation, electric fields in different directions superimpose and cancel each other out. Single-channel scalar detection cannot reproduce the true comprehensive spatial field strength, further amplifying the detection deviation and distorting the alarm judgment basis.

[0005] In summary, current proximity alarm safety helmets are all based on scalar detection, lacking sufficient ability to reproduce spatial electric fields, resulting in inaccurate electric field detection results. Summary of the Invention

[0006] The purpose of this invention is to provide a near-electric alarm safety helmet and alarm method with omnidirectional field strength vector monitoring. By synthesizing electric field strength components oriented in different directions, the spatial electric field strength and field source direction are determined, which solves the problem of inaccurate electric field detection results of existing safety helmets.

[0007] This invention is achieved through the following technical solution:

[0008] The first aspect of this application provides a safety helmet with omnidirectional field strength vector monitoring and proximity alarm, including a safety helmet body, characterized in that the safety helmet body is equipped with an omnidirectional field strength sensor array, a vector field signal processing module and an alarm module;

[0009] The omnidirectional field strength sensing array includes at least five electric field sensors, which are respectively arranged on the top of the helmet body and around the brim, and the sensing element of each electric field sensor faces the outside of the helmet body.

[0010] The vector field signal processing module is electrically connected to the omnidirectional field strength sensing array. It is used to acquire the electric field strength components collected by each electric field sensor, and to perform vector synthesis on each electric field strength component to determine the spatial electric field strength and the direction of the field source; and to compare the spatial electric field strength with preset safety thresholds and critical thresholds to determine the alarm level of the location of the safety helmet.

[0011] The alarm module is electrically connected to the vector field signal processing module and is used to output corresponding alarm prompts according to the alarm level.

[0012] In one feasible implementation, the omnidirectional field strength sensing array includes at least one top-facing sensor located at the top of the helmet body, and at least four horizontally arranged front-facing, rear-facing, left-facing, and right-facing sensors around the brim.

[0013] The sensing elements of the forward, backward, left, and right sensors are respectively oriented towards the front, back, left, and right, and the sensing direction of the forward sensor is consistent with the direction in which the helmet wearer is facing.

[0014] In one feasible implementation, the vector field signal processing module is specifically used for:

[0015] When the electric field strength in space is less than the preset safety threshold, it is determined to be a safe state, corresponding to the first level alarm;

[0016] When the spatial electric field strength is greater than or equal to the preset safety threshold and less than the preset critical threshold, or when the gradient of the spatial electric field strength continues to increase and the gradient change rate exceeds the set gradient change threshold, it is determined to be a warning state and corresponds to the second level alarm.

[0017] When the electric field strength in space is greater than or equal to a preset critical threshold, it is determined to be a dangerous state and a third-level alarm is triggered.

[0018] In one feasible implementation, the safety helmet is also equipped with a direction indicator and evacuation guidance module;

[0019] The direction indicator and evacuation guidance module includes a ring light strip, which is set around the entire circumference of the helmet body along the outer edge of the brim; the ring light strip includes multiple independent LEDs, each of which is electrically connected to the vector field signal processing module, and each LED is bound to the layout orientation of the electric field sensor according to the spatial partition to which its installation position belongs.

[0020] The ring-shaped light strip distinguishes alarm levels by changing the color of the LED beads, and indicates the direction of the field source by the illuminated LED bead area.

[0021] In one feasible implementation, when the vector field signal processing module determines that a level 3 alarm has been detected, the direction indication and evacuation guidance module is used to:

[0022] By sequentially illuminating the LED beads to indicate the evacuation direction, the wearer is guided to evacuate in the direction where the electric field strength decreases.

[0023] In one feasible implementation, when the vector field signal processing module determines that a second-level alarm has been triggered, the direction indication and evacuation guidance module is used to:

[0024] The direction of the field source is indicated by periodically illuminating the LED bead area corresponding to the field source direction.

[0025] In one feasible implementation, the direction indicator and evacuation guidance module also includes a top warning light group;

[0026] The top warning light group is located on the top of the safety helmet body. When the vector field signal processing module determines that it is a level 3 alarm, the top warning light group emits a flashing alarm signal.

[0027] A second aspect of this application provides a proximity alarm method, implemented based on the aforementioned safety helmet, the method comprising:

[0028] The electric field intensity components collected by each electric field sensor are acquired, and the electric field intensity components are vector synthesized to determine the spatial electric field intensity and the direction of the field source.

[0029] The spatial electric field strength is compared with the preset safety threshold and critical threshold to determine the alarm level of the location of the safety helmet.

[0030] Output the corresponding alarm prompt based on the alarm level.

[0031] In one feasible implementation, the spatial electric field strength is compared with preset safety thresholds and critical thresholds to determine the alarm level of the helmet's location, including:

[0032] When the electric field strength in space is less than the preset safety threshold, it is determined to be a safe state, corresponding to the first level alarm;

[0033] When the spatial electric field strength is greater than or equal to the preset safety threshold and less than the preset critical threshold, or when the gradient of the spatial electric field strength continues to increase and the gradient change rate exceeds the set gradient change threshold, it is determined to be a warning state and corresponds to the second level alarm.

[0034] When the electric field strength in space is greater than or equal to a preset critical threshold, it is determined to be a dangerous state and a third-level alarm is triggered.

[0035] In one feasible implementation, a corresponding alarm prompt is output according to the alarm level, including:

[0036] When the alarm level is the second level alarm, the LED bead area of ​​the ring light strip corresponding to the direction of the field source is periodically lit to indicate the location of the field source.

[0037] When the alarm level is level three, the LED beads of the ring-shaped light strip are lit in sequence to indicate the evacuation direction and guide the wearer to evacuate in the direction where the electric field strength decreases; and a flashing alarm signal is emitted through the top warning light group located on the top of the helmet body.

[0038] The ring-shaped light strip is arranged around the entire circumference of the safety helmet body along the outer edge of the brim; the ring-shaped light strip includes multiple light beads, and each light bead is bound to the spatial partition to which the electric field sensor is deployed according to its installation position.

[0039] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0040] This embodiment of the application deploys electric field sensors on the top and around the brim of the safety helmet, with the sensing elements of each sensor facing outwards from the helmet body, forming an omnidirectional sensing array on the helmet. This array is used to synthesize electric field intensity components from various spatial directions. By synthesizing these components, the spatial electric field intensity and the direction of the field source can be further determined. Because the electric field sensors are positioned on the top and around the brim, they can simultaneously collect electric field intensity components from different spatial directions. Even if the charged field source is located at any position relative to the wearer, a corresponding electric field sensor will collect the signal, avoiding the loss of sensing amplitude due to the angle of electric field incidence and ensuring the integrity of the collected electric field intensity components. Vector synthesis based on the complete electric field intensity components allows for the fusion of electric field information collected from various directions, yielding a complete and accurate spatial electric field intensity, rather than a localized field strength value in a single direction, thus improving the accuracy of the field strength detection results. Attached Figure Description

[0041] To more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort. In the drawings:

[0042] Figure 1 A schematic diagram of the structure of the proximity alarm safety helmet for omnidirectional field strength vector monitoring provided in this application embodiment;

[0043] Figure 2 A top view of the proximity alarm safety helmet with omnidirectional field strength vector monitoring provided in this application embodiment;

[0044] Figure 3 This is a flowchart illustrating a proximity alarm method provided in an embodiment of this application.

[0045] The attached diagram shows the markings and corresponding component names:

[0046] 11-Safety helmet body, 12-Electric field sensor, 13-Ring light strip, 1301-LED bead, 14-Top warning light assembly. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention.

[0048] As will be known to those skilled in the art, with the development of technology and the emergence of new scenarios, the technical solutions provided in the embodiments of this application are also applicable to similar technical problems.

[0049] The terms “comprising” and “having”, and any variations thereof, in the specification, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion, so that a process, method, system, product, or apparatus that comprises a series of elements is not necessarily limited to those elements, but may include other elements not expressly listed or inherent to such process, method, product, or apparatus.

[0050] Example 1:

[0051] Embodiment 1 of this application provides a proximity alarm safety helmet with omnidirectional field strength vector monitoring to solve the problem of inaccurate electric field detection results of existing safety helmets.

[0052] The safety helmet is equipped with an omnidirectional field strength sensor array, a vector field signal processing module, an alarm module, a direction indicator and evacuation guidance module, and an attitude sensing module.

[0053] The helmet body is made of ABS (Acrylonitrile Butadiene Styrene) engineering plastic or high-strength composite material, conforming to national mandatory inspection standards such as GB2811. The helmet body is internally equipped with EPS (Expanded Polystyrene) cushioning pads and a liner to absorb external impacts and provide space for the installation of various functional modules. A skin-friendly cotton liner is placed inside the helmet body to enhance wearing comfort.

[0054] The omnidirectional field strength sensor array, alarm module, and direction indication and evacuation guidance module are mounted on the outside of the helmet body, while the vector field signal processing module and attitude sensing module are mounted on the inside of the helmet.

[0055] like Figure 1 , 2 As shown, the omnidirectional field strength sensing array includes at least five electric field sensors 12, which are respectively arranged on the top of the helmet body 11 and around the brim, and the sensing element of each electric field sensor faces the outside of the helmet body.

[0056] The omnidirectional field strength sensor array includes at least one top-facing sensor located at the top of the helmet body, and at least four horizontally arranged front, rear, left, and right sensors around the brim. The sensing elements of the front, rear, left, and right sensors face directly forward, backward, left, and right, respectively, with the front sensor's sensing direction aligned with the helmet wearer's facing direction. This deployment of the electric field sensors ensures that the omnidirectional field strength sensor array can acquire electric field strength components in all five orthogonal directions: front, rear, left, right, and top.

[0057] The five electric field sensors are arranged in a three-dimensional orthogonal coordinate system with the center of the cap as the origin. The forward, backward, left, and right sensors form an orthogonal four-directional detection system in the horizontal plane (forming the positive and negative directions of the two orthogonal coordinate axes in the horizontal plane), and the top sensor forms the vertical Z-axis detection. The distances between the sensors and the center of the cap have been calibrated, and the error correction function is calibrated during system initialization.

[0058] In this embodiment, the electric field sensor employs a high-sensitivity capacitive electric field induction probe. A metal shielding layer is installed outside the probe to reduce electromagnetic interference and mutual coupling between sensors. The output signals of each electric field sensor are processed by independent bandpass filtering and preamplification circuits before being sent to the vector field signal processing module.

[0059] Specifically, the selection parameters for electric field sensors can be: induced electric field strength range of 0.1kV / m-500kV / m, response time ≤50ms, and single sensor measurement error ≤5%.

[0060] The vector field signal processing module is electrically connected to the omnidirectional field strength sensing array. It is used to acquire the electric field strength components collected by each electric field sensor, and to perform vector synthesis on each electric field strength component to determine the spatial electric field strength and the direction of the field source; and to compare the spatial electric field strength with preset safety thresholds and critical thresholds to determine the alarm level of the safety helmet's location.

[0061] The vector field signal processing module is located on the top inner side of the safety helmet body and includes a multi-channel synchronous sampling circuit, a bandpass filter bank, a multi-channel signal amplifier array, an A / D conversion unit, and an embedded microprocessor.

[0062] A multi-channel synchronous sampling circuit synchronously acquires the raw signals from each electric field sensor at a sampling frequency of no less than 200Hz. The bandpass filter bank is typically a 50Hz power frequency bandpass with a passband range of 45-55Hz, used to extract the power frequency electric field component and suppress high-frequency interference and DC drift. A multi-channel signal amplifier array amplifies the filtered weak electric field induced signal, boosting the low-amplitude, weak voltage from the sensor to a standard voltage range suitable for A / D conversion. The A / D conversion unit converts the amplified continuous analog voltage signal into a digital signal recognizable by the embedded microprocessor. The embedded microprocessor receives the digital signals (digitized electric field components) from each electric field sensor and executes all algorithmic logic: vector synthesis, spatial total field strength calculation, field source orientation calculation, gradient change analysis, graded alarm determination, and control of the ring light strip and audible / visual alarm output, etc.

[0063] Specifically, vector synthesis of each electric field intensity component is performed to determine the spatial electric field intensity and the direction of the field source, including:

[0064] Five raw electric field signals were acquired from the omnidirectional field strength sensor array: (Forward sensor) (Backward sensor) (Left-facing sensor) (Right-facing sensor) (Top-facing sensor); The array is calibrated before leaving the factory. A correction function is established based on the spatial distance and sensitivity deviation between each electric field sensor and the origin of the safety helmet coordinate system. The five original acquisition values ​​are compensated and corrected to obtain the standard electric field components after eliminating hardware errors. When there is no external power frequency electric field, the value acquired by the omnidirectional field strength sensor array is zero. When there is an external electric field, the magnitude and sign of each correction component correspond to the incident direction of the electric field and are used as input for the vector synthesis algorithm.

[0065] A spatial rectangular coordinate system is established from the perspective of the helmet wearer: the X-axis is the front-to-back horizontal axis, with the positive direction directly in front of the wearer; the Y-axis is the left-to-right horizontal axis, with the positive direction directly to the left of the wearer; the Z-axis is the vertical axis, with the positive direction above the top of the helmet. Common-mode interference is eliminated using the difference values ​​from opposing electric field sensors, and the horizontal orthogonal components are solved:

[0066] Projected components of the electric field on the front and rear X-axis : = - ;

[0067] Projected components of the electric field on the left and right Y axes : = - ;

[0068] The resultant field strength on the horizontal surface It can be represented as: = ; Characterizes the electric field intensity on a horizontal surface.

[0069] The vertical component of the data collected by the top sensor after spatial distance correction = (Setting up a bottom sensor for ground electric field cancellation), then Characterizes the projected components of the electric field on the vertical Z-axis.

[0070] By combining all horizontal and vertical orthogonal components, the spatial electric field intensity vector can be solved. amplitude = .

[0071] The direction of the field source is determined by calculating the horizontal azimuth and elevation angles.

[0072] Horizontal azimuth The horizontal azimuth angle represents the angle between the field source in the horizontal plane and the wearer, ranging from 0° to 360°. Using the four-quadrant arctan2(y,x) function to completely distinguish all horizontal components without quadrant loss, the expression for the horizontal azimuth angle is:

[0073] =arctan2( , );

[0074] pass It can determine the horizontal position of the live equipment in front of, behind, to the left, to the right, and diagonally to the wearer, and is used to control the ring light strip to illuminate the corresponding area.

[0075] Pitch angle The pitch angle, representing the elevation of the electric field relative to the horizontal plane, ranges from −90° to 90°. It is calculated by using the ratio of the vertical component to the resultant electric field strength on the horizontal plane.

[0076] =arctan( );

[0077] If φ>0, it means the field source is located diagonally above / directly above the wearer; if φ<0, it means the field source is located diagonally below the wearer.

[0078] It should be noted that the distance parameters of each electric field sensor are calibrated before leaving the factory, and error correction is completed during system initialization to ensure that the sampled values ​​of the electric field sensors in each direction can accurately reflect the actual electric field intensity components. The above vector synthesis formula can be modified according to the electrode structure in actual engineering. This modification is a conventional design choice based on the principle of vector decomposition in electrical engineering, and will not be elaborated here.

[0079] Based on the above vector synthesis results, when the synthesized spatial electric field intensity When the threshold is exceeded, the direction of the field source (front / back / left / right / above / combined direction, etc.) is determined based on the directional information of θ and φ and the proportional relationship of the electric field intensity components of the sensors in each direction. When multiple field sources exist, the presence of a combined electric field source is determined by monitoring the fluctuation characteristics of the electric field sensor values ​​collected in different directions, combined with time series analysis and directional gradient changes.

[0080] In one specific implementation, after calculating the spatial electric field strength, the spatial electric field strength is compared with preset safety thresholds and critical thresholds to determine the alarm level of the helmet's location. This specifically includes:

[0081] When the electric field strength in space is less than the preset safety threshold, it is determined to be a safe state, corresponding to the first level alarm;

[0082] When the spatial electric field strength is greater than or equal to the preset safety threshold and less than the preset critical threshold, or when the gradient of the spatial electric field strength continues to increase and the gradient change rate exceeds the set gradient change threshold (indicating that the wearer is rapidly approaching the field source), it is determined to be a warning state, corresponding to the second level alarm.

[0083] When the electric field strength in space is greater than or equal to a preset critical threshold, it is determined to be a dangerous state and a third-level alarm is triggered.

[0084] The direction indicator and evacuation guidance module is electrically connected to the vector field signal processing module, including a ring light strip 13 and a top warning light group 14.

[0085] A ring-shaped light strip 13 is installed around the entire circumference of the helmet body along the outer edge of the brim. It includes multiple independent RGB (Red, Green, Blue) LED (Light Emitting Diode) beads 1301. Each bead is independently electrically connected to the vector field signal processing module, and each bead is bound to the spatial partition of the electric field sensor according to its installation location. It can light up the corresponding LED bead according to the different electric field vector directions θ, forming a dynamic light effect to intuitively indicate the direction of the field source. The ring-shaped light strip distinguishes the alarm level by the color change of the beads.

[0086] The top warning light assembly 14 is located on the top of the safety helmet body and consists of high-brightness red LEDs, which work in conjunction with a speaker to provide an audible and visual alarm. When the vector field signal processing module determines that it is a level three alarm, the top warning light assembly emits a flashing alarm signal.

[0087] The control logic for directional indication in the directional indication and evacuation guidance module specifically includes:

[0088] When the vector field signal processing module determines that a level two alarm has been triggered, the ring-shaped light strip periodically illuminates the LED area corresponding to the electric field direction θ, creating a "light compass" effect to indicate the direction of the electric field source to the wearer. As the wearer approaches the field source, causing the electric field strength to increase and the direction angle θ to change, the illuminated area of ​​the light strip dynamically changes accordingly, allowing the wearer to perceive the relative location of the field source in real time.

[0089] When the vector field signal processing module determines it to be a Level 3 alarm, the ring light strip switches to red and activates the evacuation guidance mode: by sequentially illuminating the LED beads, the evacuation direction is indicated, guiding the wearer to evacuate in the direction of decreasing electric field strength. Specifically, based on real-time changes in the electric field gradient, if the wearer's current direction of movement is towards the direction of increasing composite field strength (closer to the field source), the light strip moves in a scrolling pattern from the side away from the field source to the side closer to the field source (warning to stop moving forward); if the wearer needs to evacuate, the light strip moves in a scrolling pattern from the side closer to the field source to the side farther away from the field source, guiding the wearer to evacuate in the direction of decreasing electric field strength. Additionally, during a Level 3 alarm, the top warning light group emits a flashing alarm signal, working in conjunction with the ring light strip in directional guidance mode for a coordinated warning.

[0090] It should be noted that since at least two workers are required for on-site operations such as power construction / maintenance, workers can obtain information about the electric field at the work site by observing the ring-shaped light strip on their partner's safety helmet.

[0091] The alarm module is electrically connected to the vector field signal processing module and is used to output corresponding alarm prompts according to the alarm level.

[0092] The alarm module includes a speaker installed on the front side of the safety helmet near the ears. When the alarm is triggered, it emits a tiered alarm sound: a short, intermittent "beep-beep-beep" sound in the warning state, and a continuous, rapid "beep-beep-beep" sound in the danger state, with a volume of no less than 90dB, meeting the auditory warning needs in noisy working environments. Combined with different colored light signals emitted by the ring light strip and the top warning light group, it provides dual visual and auditory warnings.

[0093] The helmet in this embodiment also includes an attitude sensing module, which comprises a three-axis accelerometer and a three-axis gyroscope, mounted on the top of the helmet body and electrically connected to the vector field signal processing module. This module is used to acquire the wearer's head orientation and attitude angles (heading angle, pitch angle, roll angle) in real time. The vector field signal processing module then synchronously compares the electric field vector direction θ with the wearer's head orientation to eliminate directional illusions caused by head rotation. Simultaneously, it is used to determine the wearer's head movement state, assisting in the identification and warning of abnormal behavior.

[0094] The safety helmet in this embodiment also includes a power management and self-powered module, which comprises a rechargeable lithium-ion battery pack and a charge / discharge management circuit. As a preferred embodiment, a semiconductor thermoelectric generator array is disposed in the interlayer between the inner and outer surfaces of the safety helmet body. This array utilizes the temperature difference between the internal and external environments of the helmet (solar radiation raises the temperature of the helmet shell, while heat dissipation from the human body creates a temperature difference) to generate DC power. This DC power is then processed by a boost and regulated circuit to power each module, with any remaining energy stored in the lithium-ion battery. When the temperature difference is insufficient, the system automatically switches to battery power mode, ensuring uninterrupted power supply under any working environment.

[0095] The safety helmet in this embodiment also includes a wireless communication module (Bluetooth / WiFi / 4G / 5G) for transmitting electric field vector monitoring data, alarm records, evacuation trajectories, and other information to the background monitoring system in real time, enabling full-cycle traceability and remote monitoring of the operation process. This module can also receive remotely set threshold parameters for remote configuration.

[0096] In this embodiment, the omnidirectional field strength sensor array, vector field signal processing module, direction indication and evacuation guidance module, attitude sensing module, audible and visual alarm module, and power management module are detachably integrated into a single housing. This housing is mounted on the helmet's mounting base via a quick-release structure, facilitating the removal of electronic components during maintenance, repair, and cleaning, and preventing damage to electronic components due to water ingress during cleaning. The housing features a waterproof filter for the speaker's sound output hole and a waterproof gasket for the charging interface, enhancing its waterproof and sweatproof capabilities.

[0097] In the embodiments described above, electric field sensors are deployed on the top and around the brim of the safety helmet, with the sensing elements of each sensor facing outwards from the helmet body. This forms an omnidirectional sensing array on the helmet, used to synthesize electric field intensity components from various spatial directions. By synthesizing these components, the spatial electric field intensity and the direction of the field source are further determined. Because the electric field sensors are deployed on the top and around the brim, they can simultaneously collect electric field intensity components from different spatial directions. Even if the charged field source is located at any position relative to the wearer, a corresponding electric field sensor will collect the signal, avoiding the loss of sensing amplitude due to the angle of electric field incidence and ensuring the integrity of the collected electric field intensity components. Vector synthesis based on the complete electric field intensity components allows for the fusion of electric field information collected from various directions, yielding a complete and accurate spatial electric field intensity, rather than a localized field strength value in a single direction, thus improving the accuracy of the field strength detection results.

[0098] Example 2:

[0099] To address the problem of inaccurate electric field detection results in existing safety helmets, and based on the same inventive concept as Embodiment 1, this application also provides a proximity alarm method.

[0100] like Figure 3 As shown, the proximity alarm method of this embodiment includes the following steps 31-33:

[0101] Step 1: Obtain the electric field intensity components collected by each electric field sensor, and perform vector synthesis on each electric field intensity component to determine the spatial electric field intensity and the direction of the field source;

[0102] Step 2: Compare the spatial electric field strength with the preset safety threshold and critical threshold to determine the alarm level of the location of the safety helmet;

[0103] Step 3: Output the corresponding alarm prompt according to the alarm level.

[0104] In one feasible implementation, the spatial electric field strength is compared with preset safety thresholds and critical thresholds to determine the alarm level of the helmet's location, including:

[0105] When the electric field strength in space is less than the preset safety threshold, it is determined to be a safe state, corresponding to the first level alarm;

[0106] When the spatial electric field strength is greater than or equal to the preset safety threshold and less than the preset critical threshold, or when the gradient of the spatial electric field strength continues to increase and the gradient change rate exceeds the set gradient change threshold, it is determined to be a warning state and corresponds to the second level alarm.

[0107] When the electric field strength in space is greater than or equal to a preset critical threshold, it is determined to be a dangerous state and a third-level alarm is triggered.

[0108] In one feasible implementation, a corresponding alarm prompt is output according to the alarm level, including:

[0109] When the alarm level is the second level alarm, the LED bead area of ​​the ring light strip corresponding to the direction of the field source is periodically lit to indicate the location of the field source.

[0110] When the alarm level is level three, the LED beads of the ring-shaped light strip are lit in sequence to indicate the evacuation direction and guide the wearer to evacuate in the direction where the electric field strength decreases; and a flashing alarm signal is emitted through the top warning light group located on the top of the helmet body.

[0111] The ring-shaped light strip is arranged around the entire circumference of the safety helmet body along the outer edge of the brim; the ring-shaped light strip includes multiple light beads, and each light bead is bound to the spatial partition to which the electric field sensor is deployed according to its installation position.

[0112] This embodiment of the application deploys electric field sensors on the top and around the brim of the safety helmet, with the sensing elements of each sensor facing outwards from the helmet body, forming an omnidirectional sensing array on the helmet. This array is used to synthesize electric field intensity components from various spatial directions. By synthesizing these components, the spatial electric field intensity and the direction of the field source can be further determined. Because the electric field sensors are positioned on the top and around the brim, they can simultaneously collect electric field intensity components from different spatial directions. Even if the charged field source is located at any position relative to the wearer, a corresponding electric field sensor will collect the signal, avoiding the loss of sensing amplitude due to the angle of electric field incidence and ensuring the integrity of the collected electric field intensity components. Vector synthesis based on the complete electric field intensity components allows for the fusion of electric field information collected from various directions, yielding a complete and accurate spatial electric field intensity, rather than a localized field strength value in a single direction, thus improving the accuracy of the field strength detection results.

[0113] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A proximity alarm safety helmet with omnidirectional field strength vector monitoring, comprising a helmet body, characterized in that, The safety helmet body is equipped with an omnidirectional field strength sensor array, a vector field signal processing module and an alarm module. The omnidirectional field strength sensing array includes at least five electric field sensors, which are respectively arranged on the top of the helmet body and around the brim, and the sensing element of each electric field sensor faces the outside of the helmet body. The vector field signal processing module is electrically connected to the omnidirectional field strength sensing array. It is used to acquire the electric field strength components collected by each electric field sensor, and to perform vector synthesis on each electric field strength component to determine the spatial electric field strength and the direction of the field source; and to compare the spatial electric field strength with preset safety thresholds and critical thresholds to determine the alarm level of the location of the safety helmet. The alarm module is electrically connected to the vector field signal processing module and is used to output corresponding alarm prompts according to the alarm level.

2. The proximity alarm safety helmet with omnidirectional field strength vector monitoring according to claim 1, characterized in that, The omnidirectional field strength sensing array includes at least one top sensor located at the top of the helmet body, and at least four horizontally arranged front, rear, left and right sensors around the brim. The sensing elements of the forward, backward, left, and right sensors are respectively oriented towards the front, back, left, and right, and the sensing direction of the forward sensor is consistent with the direction in which the helmet wearer is facing.

3. The proximity alarm safety helmet with omnidirectional field strength vector monitoring according to claim 2, characterized in that, The vector field signal processing module is specifically used for: When the electric field strength in space is less than the preset safety threshold, it is determined to be a safe state, corresponding to the first level alarm; When the spatial electric field strength is greater than or equal to the preset safety threshold and less than the preset critical threshold, or when the gradient of the spatial electric field strength continues to increase and the gradient change rate exceeds the set gradient change threshold, it is determined to be a warning state and corresponds to the second level alarm. When the electric field strength in space is greater than or equal to a preset critical threshold, it is determined to be a dangerous state and a third-level alarm is triggered.

4. The proximity alarm safety helmet with omnidirectional field strength vector monitoring according to claim 3, characterized in that, The safety helmet is also equipped with a direction indicator and evacuation guidance module; The direction indicator and evacuation guidance module includes a ring light strip, which is set around the entire circumference of the helmet body along the outer edge of the brim; the ring light strip includes multiple independent LEDs, each of which is electrically connected to the vector field signal processing module, and each LED is bound to the layout orientation of the electric field sensor according to the spatial partition to which its installation position belongs. The ring-shaped light strip distinguishes alarm levels by changing the color of the LED beads, and indicates the direction of the field source by the illuminated LED bead area.

5. The proximity alarm safety helmet with omnidirectional field strength vector monitoring according to claim 4, characterized in that, When the vector field signal processing module determines that a level 3 alarm has been triggered, the direction indication and evacuation guidance module is used for: By sequentially illuminating the LED beads to indicate the evacuation direction, the wearer is guided to evacuate in the direction where the electric field strength decreases.

6. The proximity alarm safety helmet with omnidirectional field strength vector monitoring according to claim 4, characterized in that, When the vector field signal processing module determines that a level 2 alarm has been triggered, the direction indication and evacuation guidance module is used for: The direction of the field source is indicated by periodically illuminating the LED bead area corresponding to the field source direction.

7. The proximity alarm safety helmet with omnidirectional field strength vector monitoring according to claim 4, characterized in that, The direction indicator and evacuation guidance module also includes a top warning light assembly; The top warning light group is located on the top of the safety helmet body. When the vector field signal processing module determines that it is a level 3 alarm, the top warning light group emits a flashing alarm signal.

8. A proximity alarm method, characterized in that, Based on the safety helmet according to any one of claims 1-7, the method includes: The electric field intensity components collected by each electric field sensor are acquired, and the electric field intensity components are vector synthesized to determine the spatial electric field intensity and the direction of the field source. The spatial electric field strength is compared with the preset safety threshold and critical threshold to determine the alarm level of the location of the safety helmet. Output the corresponding alarm prompt based on the alarm level.

9. The proximity alarm method according to claim 8, characterized in that, The spatial electric field strength is compared with preset safety thresholds and critical thresholds to determine the alarm level of the helmet's location, including: When the electric field strength in space is less than the preset safety threshold, it is determined to be a safe state, corresponding to the first level alarm; When the spatial electric field strength is greater than or equal to the preset safety threshold and less than the preset critical threshold, or when the gradient of the spatial electric field strength continues to increase and the gradient change rate exceeds the set gradient change threshold, it is determined to be a warning state and corresponds to the second level alarm. When the electric field strength in space is greater than or equal to a preset critical threshold, it is determined to be a dangerous state and a third-level alarm is triggered.

10. The proximity alarm method according to claim 9, characterized in that, Output corresponding alarm prompts based on the alarm level, including: When the alarm level is the second level alarm, the LED bead area of ​​the ring light strip corresponding to the direction of the field source is periodically lit to indicate the location of the field source. When the alarm level is level three, the LED beads of the ring-shaped light strip are lit in sequence to indicate the evacuation direction and guide the wearer to evacuate in the direction where the electric field strength decreases; and a flashing alarm signal is emitted through the top warning light group located on the top of the helmet body. The ring-shaped light strip is arranged around the entire circumference of the safety helmet body along the outer edge of the brim; the ring-shaped light strip includes multiple light beads, and each light bead is bound to the spatial partition to which the electric field sensor is deployed according to its installation position.

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