Gas detection bracelet

Abstract

The invention discloses a gas detection bracelet, and relates to the field of gas detection equipment. The gas detection bracelet comprises a bracelet main body, a gas sensor module, a control module, an alarm module and a power supply module. The gas detection bracelet has the advantages that firstly, a wearing mode of the bracelet main body is adopted, the gas detection bracelet is convenient to carry, and the design of the gas sensor module, the control module and the alarm module is utilized, so that continuous monitoring, timely early warning and safety guarantee are facilitated; secondly, external gas is uniformly diffused to a plurality of mutually isolated detection cavities by arranging a flow guide structure, so that cross interference of different gases is effectively avoided, the detection accuracy is ensured, and thirdly, liquid water and dust are effectively blocked while uniform diffusion of the gas is ensured by combining the flow guide structure formed by a labyrinth type gas channel and a hydrophobic breathable film, so that the detection accuracy is improved. And the detection accuracy and the durability of the sensor in a severe environment are remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas detection equipment, in particular to a gas detection bracelet. BACKGROUND

[0002] Traditional gas detection equipment is mostly fixed or handheld. The fixed equipment is installed in a specific position and can only monitor the gas concentration in a specific area. The handheld equipment needs to be actively operated by the operator for detection and cannot continuously monitor the gas concentration in the surrounding environment of the operator in real time.

[0003] When working in a limited space, workers often encounter a situation where the concentration of toxic gas (methane, carbon monoxide, etc.) is too high. The existing detection equipment has the following shortcomings: First, in the current industrial, mine and other scenes, the fixed or handheld gas detector is large in size and inconvenient to wear, and is mostly single-point measurement, which is not convenient for continuous monitoring with the personnel, and cannot effectively monitor and warn the toxic gas concentration in the surrounding environment of the operator in time, so that the worker cannot detect the danger in time and is prone to suffocation and other accidents; Second, the existing part of the high-precision detection equipment can only detect a single type of gas. Although the detection accuracy is high, when the gas environment inside the limited space is complex, other dangerous gases may be missed. The comprehensive dangerous gas detection equipment usually sets multiple types of sensors inside the air duct. The arrangement of the sensors in the air duct is prone to mutual influence, and the flow rate of the mixed gas is uneven. This design reduces the detection accuracy and the detection equipment is prone to false alarms; Third, the air duct for detection is easily affected by dust and moisture, and has low durability. In view of the shortcomings of the prior art, the present application provides a gas detection bracelet to solve the above problems. SUMMARY

[0004] In view of the shortcomings of the prior art, the present application provides a gas detection bracelet. First, the bracelet body is worn, which is convenient to carry. The design of the gas sensor module, the control module and the alarm module facilitates continuous monitoring and timely warning to ensure safety. Second, the external gas is evenly diffused to multiple detection cavities isolated from each other by setting the flow guide structure, which effectively avoids the cross interference of different gases and ensures the detection accuracy. Third, the flow guide structure composed of the labyrinth air duct and the hydrophobic breathable membrane effectively blocks liquid water and dust while ensuring uniform diffusion of gas, which significantly improves the detection accuracy and the durability of the sensor in harsh environments.

[0005] To achieve the above purpose, the present application realizes the following technical scheme: a gas detection bracelet, comprising: The bracelet body is made of flexible material and is used for wearing on the wrist of a user. The inside of the bracelet body is provided with a flow guide structure. The gas sensor module is built in the bracelet body and is fixedly connected with the bracelet body. The gas sensor module is used for detecting at least one target gas concentration in the environment in real time and generating a detection signal. The control module is arranged in the bracelet body and is electrically connected with the gas sensor module. The control module is used for receiving and processing the detection signal, calculating a real-time gas concentration value, and generating an alarm trigger signal when the real-time gas concentration value exceeds a preset safety threshold. The alarm module is arranged in the bracelet body and is electrically connected with the control module. The alarm module is used for receiving the alarm trigger signal and performing at least one alarm action. The power module is arranged in the bracelet body and is electrically connected with each power module of the bracelet. The power module is used for supplying power to each power module of the bracelet. The gas sensor module includes a first sensor for detecting a first type of gas and a second sensor for detecting a second type of gas. The detection cavities of the first sensor and the second sensor are isolated from each other and are in communication with the external environment through a flow guide structure. The flow guide structure is configured to allow external gas to diffuse uniformly to the two detection cavities at the same time and to block liquid water and large-particle dust from entering.

[0006] Preferably, the flow guide structure includes a shared air inlet. The flow guide structure is internally provided with at least one labyrinth air passage and a hydrophobic breathable membrane. The labyrinth air passage is configured to increase the gas flow path to balance the gas pressure. The hydrophobic breathable membrane is configured to allow gas molecules to pass through while blocking liquid water. The labyrinth air passage and the hydrophobic breathable membrane are both arranged inside the flow guide structure and are fixedly connected with the flow guide structure.

[0007] Preferably, the control module is configured to perform the following steps: Collecting the detection signal from the gas sensor module at a period T; Filtering and denoising the detection signal; Converting the processed signal value into a real-time gas concentration value C_r based on a calibration curve function f(x). The calibration curve function f(x) is obtained by multi-point calibration of each sensor before factory shipment; Comparing C_r with a preset safety threshold C_t.

[0008] Preferably, the control module is further configured to dynamically adjust the safety threshold C_t using an adaptive threshold algorithm. The adjustment formula is: C_t=C_tb+k×σ wherein, C_t is a dynamically adjusted safety threshold, C_tb is a basic threshold set according to a safety standard, k is an adjustment coefficient, wherein 0.1≤k≤0.5, and σ is a standard deviation of detected gas concentration values in a past period of time.

[0009] Preferably, the alarm module comprises: a sound alarm unit arranged in the bracelet main body and electrically connected with the control module, for emitting high-decibel intermittent alarm sound; a vibration alarm unit arranged in the bracelet main body and electrically connected with the control module, for generating high-intensity intermittent vibration; wherein the control module controls the sound alarm unit and the vibration alarm unit to execute an asynchronous alarm strategy, that is, at the initial stage of alarm triggering, the vibration alarm unit is preferentially started, and if no alarm confirmation operation by the user through the interaction module is detected within a preset time period Δt, the sound alarm unit is then started.

[0010] Preferably, the bracelet further comprises an interaction module arranged on the outer surface of the bracelet main body and electrically connected with the control module, the interaction module comprising at least one physical button or touch sensor for receiving single or specific gesture operation of the user to perform alarm confirmation, sound elimination or information query.

[0011] Preferably, the bracelet further comprises an environment compensation unit arranged in the bracelet main body and electrically connected with the control module, comprising a temperature sensor and a humidity sensor for detecting ambient temperature and humidity; the control module receives the temperature and humidity data and corrects the real-time gas concentration value C_r using the following compensation formula to obtain a compensated concentration value C_c: C_c=C_r×[1+α(T-T0)+β(RH-RH0)] wherein T is the current temperature, T0 is the reference temperature, RH is the current relative humidity, RH0 is the reference humidity, and α and β are the temperature and humidity compensation coefficients of the corresponding sensor in the gas sensor module.

[0012] Preferably, the bracelet further comprises a wireless communication module arranged in the bracelet main body and connected with the control module, for wirelessly transmitting the real-time gas concentration value, alarm information and bracelet state data to an external terminal or monitoring center; the wireless communication module supports Bluetooth Low Energy protocol and is configured to be in sleep mode in normal monitoring state and to be woken up and establish communication connection only when alarm is triggered or an external query instruction is received.

[0013] Preferably, the bracelet further comprises a positioning module arranged in the bracelet body and electrically connected with the control module, for acquiring current position information of the bracelet; the control module is configured to bind the current position information with the alarm information when the alarm trigger signal is generated, and send them together through the wireless communication module.

[0014] Preferably, the outer surface of the bracelet body is provided with a protective structure, which comprises an impact-resistant protrusion surrounding the outer periphery of the bracelet body and a metal protective net covering the gas sensor module air inlet.

[0015] Technical effects and advantages of the present application: 1. The gas detection bracelet, first, adopts the wearing mode of the bracelet body, is convenient to carry, and utilizes the design of the gas sensor module, the control module and the alarm module to facilitate continuous monitoring, timely early warning and safety guarantee; second, the external gas is uniformly diffused to the plurality of mutually isolated detection cavities through the setting of the flow guide structure, effectively avoiding the cross interference of different gases and ensuring the detection accuracy; third, the flow guide structure composed of the labyrinth airway and the hydrophobic breathable membrane effectively blocks liquid water and dust while ensuring uniform diffusion of the gas, significantly improving the detection accuracy and the durability of the sensor in harsh environments.

[0016] 2. The gas detection bracelet introduces an adaptive threshold adjustment mechanism based on historical data standard deviation, effectively avoiding false alarms caused by environmental fluctuations; adopts an asynchronous alarm strategy of vibration priority and sound delay, and realizes user-controllable alarm combined with the interaction module, ensuring that users can timely and reliably receive danger warnings in different environments.

[0017] 3. The gas detection bracelet compensates the gas concentration value in real time by the built-in temperature and humidity sensor, reduces the interference of environmental factors; supports low-power Bluetooth communication and a positioning module, automatically uploads the position and concentration data when alarming, facilitates remote monitoring and emergency response, and enhances the practicality and safety of the device in industrial and outdoor scenes. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.

[0019] Figure 1 It is a schematic diagram of the overall structure of the present application; Figure 2 It is a schematic diagram of the position of the environmental compensation unit of the present application; Figure 3 A cross-sectional view of the flow guide structure of the present application is shown in the figure. Figure 4 A position diagram of the control module of the present application is shown in the figure. Figure 5 A signal processing flow chart of the present application is shown in the figure. Figure 6 A gas flow guide path diagram of the present application is shown in the figure. Figure 7 An adaptive threshold adjustment flow chart of the present application is shown in the figure. Figure 8 An asynchronous alarm strategy flow chart of the present application is shown in the figure. Figure 9 An environmental compensation flow chart of the present application is shown in the figure. Figure 10 A wireless communication control diagram of the present application is shown in the figure. Figure 11 A positioning information binding flow chart of the present application is shown in the figure.

[0020] In the figure: 1, bracelet main body; 2, gas sensor module; 21, first sensor; 22, second sensor; 23, flow guide structure; 231, hydrophobic gas-permeable membrane; 232, labyrinthine airway; 3, control module; 4, alarm module; 41, sound alarm unit; 42, vibration alarm unit; 5, power module; 6, interactive module; 7, environmental compensation unit; 71, temperature sensor; 72, humidity sensor; 8, wireless communication module; 9, positioning module; 10, protective structure; 101, impact-resistant protrusion; 102, metal protective net. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0022] The present embodiment discloses a gas detection bracelet. According to the accompanying drawings, Figure 1 to Figure 11 , the present embodiment includes: The bracelet main body 1 is made of flexible material, such as silicone or TPU thermoplastic polyurethane elastomer. Such material has good flexibility and comfort, can be fitted to the user's wrist, and is suitable for long-term wear. The inside of the bracelet main body 1 is provided with a flow guide structure 23; Gas sensor module 2, built into the main body 1 of the wristband and fixedly connected to it, is used to detect the concentration of at least one target gas in the environment in real time and generate a detection signal. Gas sensor module 2 includes a first sensor 21 for detecting a first type of gas and a second sensor 22 for detecting a second type of gas. For example, the first sensor 21 can detect carbon monoxide (CO), and the second sensor 22 can detect methane (CH4). The detection chambers of the two sensors are isolated from each other to avoid cross-interference between different gases and ensure the accuracy of the detection results. It is connected to the external environment through a flow guiding structure 23. The design of the flow guiding structure 23 allows external gas to diffuse evenly to both detection chambers simultaneously, ensuring that both sensors can simultaneously contact the gas in the same environment, improving detection consistency. At the same time, the flow guiding structure 23 can prevent liquid water and large dust particles from entering, preventing these substances from damaging the sensors or affecting detection accuracy, and extending the service life of the sensors.

[0023] The control module 3, located within the main body 1 of the wristband, is electrically connected to the gas sensor module 2. It receives and processes detection signals to calculate the real-time gas concentration value and generates an alarm trigger signal when the real-time gas concentration value exceeds a preset safety threshold. The control module 3 is responsible for receiving and processing the detection signals generated by the gas sensor module 2, calculating the real-time gas concentration value using a built-in algorithm. It is the core control unit of the entire wristband, implementing the logical control of gas detection and alarm functions.

[0024] Alarm module 4 is located inside the main body 1 of the wristband and is electrically connected to control module 3. Alarm module 4 receives alarm trigger signals generated by control module 3 and performs at least one alarm action, such as emitting an audible alarm or generating vibration, to promptly remind the user that there is an excessive concentration of dangerous gas in the surrounding environment and to ensure the user's safety.

[0025] The power module 5, located inside the main body 1 of the bracelet, is electrically connected to each of the bracelet's power modules and is used to supply power to these modules. The power module 5 provides a stable power supply to each power module, ensuring the bracelet functions properly. It typically uses a rechargeable battery, such as a lithium battery, which has advantages such as high energy density and long lifespan.

[0026] The flow guiding structure 23 includes a common air inlet. Inside the flow guiding structure 23, there is at least one labyrinth-type air passage 232 and a hydrophobic breathable membrane 231. The labyrinth-type air passage 232 is configured to increase the gas flow path to equalize the air pressure. The hydrophobic breathable membrane 231 is configured to allow gas molecules to pass through while blocking liquid water. Both the labyrinth-type air passage 232 and the hydrophobic breathable membrane 231 are disposed inside the flow guiding structure 23 and are fixedly connected to the flow guiding structure 23.

[0027] The flow guide structure 23 features a common air inlet, simplifying the structural design and facilitating the entry of external gas. This design allows the gas to enter the flow guide structure 23 in a concentrated manner, facilitating subsequent uniform gas distribution and filtration.

[0028] The flow guiding structure 23 has at least one labyrinthine air passage 232 inside, which increases the gas flow path. When gas enters the labyrinthine air passage 232, it needs to flow in the tortuous channel, which can equalize the gas pressure in the air passage and allow the gas to diffuse evenly into the two detection chambers. At the same time, the labyrinthine air passage 232 also plays a certain buffering role, slowing down the gas flow rate and preventing the gas from rapidly impacting the sensor and affecting the detection accuracy.

[0029] A hydrophobic, breathable membrane 231 is disposed inside the flow guiding structure 23, allowing gas molecules to pass through while blocking liquid water. This is based on the microstructural characteristics of the hydrophobic, breathable membrane 231, whose surface has many tiny pores. These pores are large enough to allow gas molecules to pass through freely, but liquid water molecules are too large to pass through, thus achieving gas-liquid separation and effectively protecting the sensor from liquid water damage.

[0030] Control module 3 is configured to perform the following steps: The detection signal from the gas sensor module 2 is acquired at regular intervals with a period T; for example, the period T can be set to 1 second, meaning that the sensor's output signal is acquired once every 1 second. This timed acquisition method can ensure the continuity and real-time nature of the data, and promptly reflect changes in the gas concentration in the environment.

[0031] The detected signal undergoes filtering and noise reduction processing; this process removes noise interference from the signal. In real-world environments, the sensor's output signal may be affected by various factors, such as electromagnetic interference and the sensor's own thermal noise. Filtering algorithms, such as low-pass filtering and median filtering, can effectively remove this noise, making the signal smoother and more accurate, thus improving the precision of subsequent gas concentration calculations.

[0032] The processed signal value is converted into a real-time gas concentration value C_r based on the calibration curve function f(x). The calibration curve function f(x) is obtained by multi-point calibration of each sensor before it leaves the factory; each sensor undergoes multi-point calibration before leaving the factory to obtain the calibration curve function f(x). This function describes the relationship between the sensor output signal value and the actual gas concentration. The control module 3 converts the processed signal value into a real-time gas concentration value C_r by calling the calibration curve function f(x). For example, if the calibration curve function f(x) is a linear function f(x) = ax + b, where a and b are coefficients determined through calibration experiments, the corresponding real-time gas concentration value C_r = ax + b can be calculated when the collected signal value is x.

[0033] The system compares C_r with a preset safety threshold C_t to determine if the gas concentration in the current environment exceeds the limit. If C_r > C_t, it indicates that the concentration of hazardous gas in the environment exceeds the limit, and the control module 3 will generate an alarm trigger signal to trigger the alarm module 4 to sound an alarm.

[0034] Control module 3 is also configured to dynamically adjust the safety threshold C_t using an adaptive threshold algorithm, the adjustment formula of which is: C_t = C_tb + k × σ, where C_t is the dynamically adjusted safety threshold, C_tb is the basic threshold set according to the safety standard, k is the adjustment coefficient, where 0.1 ≤ k ≤ 0.5, and σ is the standard deviation of the gas concentration values ​​detected over a period of time, which reflects the fluctuation of the gas concentration.

[0035] This adaptive threshold algorithm allows the safety threshold C_t to be dynamically adjusted based on actual fluctuations in ambient gas concentration. When ambient gas concentration fluctuates significantly, the safety threshold is appropriately increased to prevent frequent alarm triggering due to short-term concentration fluctuations. When ambient gas concentration is relatively stable, a lower safety threshold is maintained, enabling timely detection of potential hazardous gas concentration exceedances and improving the accuracy and reliability of the bracelet's alarms.

[0036] Alarm module 4 includes: The sound alarm unit 41 is located inside the main body 1 of the wristband and is electrically connected to the control module 3. It is used to emit a high-decibel intermittent alarm sound. The high-decibel alarm sound can attract the user's attention in a noisy environment. The intermittent sound mode can save power and avoid long-term continuous sound to avoid auditory fatigue to the user.

[0037] The vibration alarm unit 42, located inside the main body 1 of the wristband and electrically connected to the control module 3, is used to generate high-intensity intermittent vibration. The vibration alarm can alert the user through tactile perception when the user is in a noisy environment or has limited hearing. The high-intensity vibration ensures that the user can clearly feel it, and the intermittent vibration can also save power.

[0038] The control module 3 controls the sound alarm unit 41 and the vibration alarm unit 42 to execute an asynchronous alarm strategy. That is, in the initial stage of alarm triggering, the vibration alarm unit 42 is activated first. If no alarm confirmation operation is detected by the user through the interaction module 6 within the preset time period Δt, the sound alarm unit 41 is activated then.

[0039] In the initial stage of alarm triggering, the vibration alarm unit 42 is activated first. This is because vibration alarms do not interfere with the surrounding environment and are more effective when the user may be in a quiet environment or have hearing impairment. If no alarm confirmation operation is detected by the user through the interaction module 6 within a preset time period Δt, the sound alarm unit 41 is then activated to further remind the user and ensure that the user is aware of the danger in a timely manner. For example, the preset time period Δt can be set to 5 seconds, meaning that if the user does not confirm the alarm within 5 seconds after the vibration alarm is activated, the sound alarm will be activated.

[0040] The wristband also includes an interaction module 6, which is located on the outer surface of the wristband body 1 and electrically connected to the control module 3. The interaction module 6 includes at least one physical button or touch sensor for receiving single or specific gestures from the user for alarm confirmation, silencing, or information retrieval. This design facilitates user operation, allowing interaction without needing to open the wristband or perform complex operations. For example, users can confirm alarms or silence the wristband by pressing the physical button, or retrieve information using specific gestures, such as swiping the touch sensor to view the currently detected gas concentration value or historical alarm records. This simple and intuitive interaction method improves the efficiency and convenience of interaction between the user and the wristband.

[0041] The wristband also includes an environmental compensation unit 7, which is located inside the wristband body 1 and electrically connected to the control module 3. The environmental compensation unit 7 includes a temperature sensor 71 and a humidity sensor 72 for detecting ambient temperature and humidity. The control module 3 receives the temperature and humidity data and corrects the real-time gas concentration value C_r using the following compensation formula to obtain the compensated concentration value C_c: C_c=C_r×[1+α(T-T0)+β(RH-RH0)] Where T is the current temperature, T0 is the reference temperature, RH is the current relative humidity, RH0 is the reference humidity, and α and β are the temperature and humidity compensation coefficients of the corresponding sensors in gas sensor module 2.

[0042] Ambient temperature and humidity can affect the detection results of gas sensors. For example, increased temperature may lead to a larger sensor output signal, while changes in humidity may affect gas diffusion and sensor sensitivity. By detecting ambient temperature and humidity, real-time gas concentration values ​​can be corrected, improving detection accuracy. These compensation coefficients are obtained through experimental calibration, and different sensors have different compensation coefficients. This compensation formula eliminates the influence of ambient temperature and humidity on gas detection results, making the results more accurate and reliable.

[0043] The wristband also includes a wireless communication module 8, which is located inside the wristband body 1 and connected to the control module 3. It is used to wirelessly transmit real-time gas concentration values, alarm information and wristband status data to an external terminal or monitoring center. This design enables the wristband to interact with external devices and realize remote monitoring and management. The wireless communication module 8 supports the Bluetooth Low Energy (BLE) protocol, which offers advantages such as low power consumption, low cost, and short-range communication, making it suitable for wearable devices. It is configured to remain in sleep mode during normal monitoring, only waking up to establish a communication connection when an alarm is triggered or an external query command is received. In sleep mode during normal monitoring, the wireless communication module 8 consumes extremely low power, extending the bracelet's battery life. Waking up only when an alarm is triggered or an external query command is received ensures timely data transmission and guarantees data real-time performance and validity.

[0044] The wristband also includes a positioning module 9, which is located inside the main body 1 and electrically connected to the control module 3. The positioning module 9 is used to obtain the wristband's current location information. It can employ positioning technologies such as GPS global positioning system and BeiDou satellite navigation system to accurately determine the wristband's geographical location. The control module 3 is configured to bind the current location information with the alarm information when an alarm trigger signal is generated, and send them together via the wireless communication module 8. Thus, when a user encounters a situation where the concentration of hazardous gas exceeds the standard, the monitoring center or relevant personnel can not only know that an alarm event has occurred, but also quickly locate the user's position and take timely rescue measures, improving the user's safety.

[0045] The outer surface of the wristband body 1 is provided with a protective structure 10, which includes an impact-resistant protrusion 101 surrounding the outer periphery of the wristband body 1 and a metal protective mesh 102 covering the air inlet of the gas sensor module 2.

[0046] The shock-resistant protrusion 101 can buffer and disperse the impact force when the bracelet is subjected to external impact, protecting the various modules inside the bracelet from damage. For example, when the bracelet is accidentally dropped or bumped, the shock-resistant protrusion 101 can absorb some of the impact energy, reducing the impact on the internal circuitry and sensors of the bracelet, and improving the reliability and lifespan of the bracelet.

[0047] The metal protective mesh 102 prevents large dust particles and foreign objects from entering the space at the detection position of the gas sensor module 2. The metal protective mesh 102 has high strength and corrosion resistance, effectively protecting the sensor for a long time. At the same time, its mesh size is reasonably designed to not affect the normal entry of gas, ensuring the accuracy of gas detection.

[0048] Example 1: Carbon monoxide detection and alarm; There is a risk of carbon monoxide leakage from gas water heaters in enclosed basements. Users wear this gas detection bracelet when moving around in basements.

[0049] Specific process: The first sensor 21 in the gas sensor module 2 is a carbon monoxide sensor, which detects the concentration of carbon monoxide in the environment in real time through the flow guiding structure 23. Assuming the current ambient temperature is 25℃ (T0=25℃), the relative humidity is 60% (RH0=60%), the basic threshold of the carbon monoxide sensor is C_tb=24ppm, and the adjustment coefficient is k=0.3.

[0050] For a period of time, control module 3 periodically acquires the detection signal from the carbon monoxide sensor at a time interval of T=1 second and performs filtering and noise reduction processing. Assume that after processing, the acquired signal value, calculated according to the calibration curve function f(x), yields a real-time gas concentration value C_r=30ppm.

[0051] Meanwhile, the environmental compensation unit 7 detected the current temperature T=26℃, the current relative humidity RH=65%, and the temperature and humidity compensation coefficients of the carbon monoxide sensor α=0.002, β=0.001. According to the compensation formula C_c=C_r×[1+α(T-T0)+β(RH-RH0)], the compensated concentration value C_c is calculated as C_c=30×[1+0.002×(26-25)+0.001×(65-60)]=30×(1+0.002+0.005)=30×1.007=30.21ppm.

[0052] Control module 3 compares the compensated concentration value C_c with the preset safety threshold C_t. Based on the adaptive threshold algorithm, assuming the standard deviation of the detected gas concentration values ​​over a past period is σ = 2 ppm, the dynamically adjusted safety threshold C_t = C_tb + k × σ = 24 + 0.3 × 2 = 24.6 ppm. Since C_c = 30.21 ppm > C_t = 24.6 ppm, control module 3 generates an alarm trigger signal.

[0053] Alarm module 4 executes an asynchronous alarm strategy, first activating vibration alarm unit 42 to trigger a vibration alarm. If the user does not confirm the alarm through interaction module 6 within a preset time period Δt = 5 seconds, then sound alarm unit 41 is activated to emit a high-decibel intermittent alarm sound.

[0054] Meanwhile, the positioning module 9 obtains the current location information of the wristband, the control module 3 binds the current location information with the alarm information, and sends it to the user's mobile phone or monitoring center through the wireless communication module 8 to remind the user and relevant personnel to take timely measures.

[0055] Example 2: Methane detection and data transmission; There is a risk of methane gas leakage in underground coal mine operations. Workers wear this gas detection wristband while working.

[0056] Specific process: The second sensor 22 in the gas sensor module 2 is a methane sensor, which detects the methane concentration in the environment in real time. Assuming the current ambient temperature is 20℃, T0=20℃, the relative humidity is 70%RH0=70%, the basic threshold of the methane sensor is C_tb=1.0% volume fraction, and the adjustment coefficient k=0.2.

[0057] Control module 3 acquires the detection signal from the methane sensor at a period of T=2 seconds and performs filtering and noise reduction processing. Assume that after processing, the acquired signal value is calculated based on the calibration curve function f(x) to obtain a real-time gas concentration value C_r=1.2% volume fraction.

[0058] The environmental compensation unit 7 detected the current temperature T=21℃, the current relative humidity RH=72%, and the temperature and humidity compensation coefficients of the methane sensor α=0.0015 and β=0.0008. According to the compensation formula C_c=C_r×[1+α(T-T0)+β(RH-RH0)], the compensated concentration value C_c is calculated as C_c=1.2×[1+0.0015×(21-20)+0.0008×(72-70)]=1.2×(1+0.0015+0.0016)=1.2×1.0031=1.2037% volume fraction.

[0059] Control module 3 compares the compensated concentration value C_c with the preset safety threshold C_t. Assuming the standard deviation σ of the detected gas concentration values ​​over a past period is 0.1% volume fraction, the dynamically adjusted safety threshold C_t = C_tb + k × σ = 1.0 + 0.2 × 0.1 = 1.02% volume fraction. Since C_c = 1.2037% volume fraction > C_t = 1.02% volume fraction, control module 3 generates an alarm trigger signal.

[0060] Alarm module 4 alarms according to an asynchronous alarm strategy. Meanwhile, wireless communication module 8 is in sleep mode under normal monitoring conditions. When an alarm is triggered, it is awakened and transmits the real-time gas concentration value, alarm information, and wristband status data wirelessly to the monitoring center above ground via Bluetooth Low Energy protocol. The monitoring center can monitor the surrounding environment of the personnel underground in real time and take appropriate safety measures in a timely manner.

[0061] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A gas detection wristband, characterized in that, include: The main body of the wristband (1) has a flow guiding structure (23) inside. A gas sensor module (2) is built into the main body (1) of the wristband and is used to detect the concentration of at least one target gas in the environment in real time and generate a detection signal. The control module (3) is located inside the main body (1) of the wristband and is electrically connected to the gas sensor module (2) for receiving and processing the detection signal; An alarm module (4) is installed inside the main body (1) of the wristband and is electrically connected to the control module (3); The power module (5) is located inside the main body (1) of the wristband and is electrically connected to each power module of the wristband. The gas sensor module (2) includes a first sensor (21) for detecting a first type of gas and a second sensor (22) for detecting a second type of gas. The detection chambers of the first sensor (21) and the second sensor (22) are isolated from each other and connected to the external environment through a flow guiding structure (23). The flow guiding structure (23) is configured to allow external gas to diffuse evenly to the two detection chambers at the same time, and to prevent liquid water and large dust particles from entering.

2. A gas detection wristband according to claim 1, characterized in that, The flow guiding structure (23) includes a common air inlet. The flow guiding structure (23) is provided with a labyrinthine air passage (232) and a hydrophobic breathable membrane (231). The labyrinthine air passage (232) is configured to increase the gas flow path to equalize the air pressure. The hydrophobic breathable membrane (231) is configured to allow gas molecules to pass through while blocking liquid water.

3. A gas detection wristband according to claim 2, characterized in that, The control module (3) is configured to perform the following steps: The detection signal from the gas sensor module (2) is collected at regular intervals of period T; The detection signal is then filtered and noise-reduced. The processed signal value is converted into a real-time gas concentration value C_r based on the calibration curve function f(x). The calibration curve function f(x) is obtained by multi-point calibration of each sensor before leaving the factory. Compare C_r with the preset safety threshold C_t.

4. A gas detection wristband according to claim 3, characterized in that, The control module (3) is also configured to dynamically adjust the safety threshold C_t using an adaptive threshold algorithm, the adjustment formula of which is: C_t = C_tb + k × σ, where, C_t is the dynamically adjusted safety threshold, C_tb is the basic threshold set according to the safety standard, k is the adjustment coefficient, where 0.1≤k≤0.5, and σ is the standard deviation of the gas concentration values ​​detected over a period of time.

5. A gas detection wristband according to claim 1, characterized in that, The alarm module (4) includes: A sound alarm unit (41) is disposed inside the main body (1) of the wristband and electrically connected to the control module (3); A vibration alarm unit (42) is installed inside the main body (1) of the wristband and is electrically connected to the control module (3); The control module (3) controls the sound alarm unit (41) and the vibration alarm unit (42) to execute an asynchronous alarm strategy. That is, in the early stage of alarm triggering, the vibration alarm unit (42) is activated first. If no alarm confirmation operation is detected by the user through the interaction module (6) within the preset time period Δt, the sound alarm unit (41) is activated again.

6. A gas detection wristband according to claim 5, characterized in that, The bracelet also includes an interaction module (6), which is disposed on the outer surface of the bracelet body (1) and electrically connected to the control module (3). The interaction module (6) includes at least one physical button or touch sensor.

7. A gas detection wristband according to claim 1, characterized in that, The wristband also includes an environmental compensation unit (7), which is disposed inside the wristband body (1) and electrically connected to the control module (3). The environmental compensation unit (7) includes a temperature sensor (71) and a humidity sensor (72), which are used to detect the ambient temperature and humidity, respectively. The control module (3) receives the temperature and humidity data and corrects the real-time gas concentration value C_r using the following compensation formula to obtain the compensated concentration value C_c: C_c=C_r×[1+α(T-T0)+β(RH-RH0)] Where T is the current temperature, T0 is the reference temperature, RH is the current relative humidity, RH0 is the reference humidity, and α and β are the temperature and humidity compensation coefficients of the corresponding sensors in the gas sensor module (2).

8. A gas detection wristband according to claim 1, characterized in that, The wristband also includes a wireless communication module (8), which is located inside the wristband body (1) and connected to the control module (3). It is used to wirelessly transmit the real-time gas concentration value, alarm information and wristband status data to an external terminal or monitoring center. The wireless communication module (8) is configured to be in sleep mode under normal monitoring conditions and is only woken up and establishes a communication connection when an alarm is triggered or an external query command is received.

9. A gas detection wristband according to claim 8, characterized in that, The wristband also includes a positioning module (9), which is located inside the wristband body (1) and electrically connected to the control module (3). The control module (3) is configured to bind the current location information with the alarm information when the alarm trigger signal is generated, and send them together through the wireless communication module (8).

10. A gas detection wristband according to claim 1, characterized in that, The outer surface of the wristband body (1) is provided with a protective structure (10), the protective structure (10) includes an impact-resistant protrusion (101) surrounding the outer periphery of the wristband body (1) and a metal protective mesh (102) covering the air inlet of the gas sensor module (2).

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