Heating type laser methane detection alarm device

Abstract

The utility model provides a kind of heating type laser methane detection alarm device, comprising: heating type laser detection sensor, including air chamber, heating type laser and photoelectric detector;Probe temperature and humidity regulator is used to detect the temperature and humidity of heating type laser detection sensor outside two ends, and temperature and humidity regulation is carried out when detecting temperature threshold value;ARM processor is used to control heating type laser to emit detection laser, and receive photoelectric signal output by photoelectric detector, and calculate methane concentration in air chamber according to photoelectric signal;It is also used to control probe temperature and humidity regulator to carry out corresponding regulation;It also carries out alarm prompt when judging that methane concentration exceeds alarm threshold value.The utility model is by using double probe temperature control can carry out waterproof, prevent pollution, so that heating type laser detection sensor is not disturbed by external water vapor and pollution.The utility model is by setting auxiliary detection module, monitors whether the output wavelength of heating type laser has drifted.

Description

Technical Field

[0001] This utility model relates to the field of methane detection technology, specifically to a heated laser methane detection alarm device. Background Technology

[0002] The heated laser methane detector alarm utilizes heated laser methane sensor technology. This sensor is a high-precision gas detection device based on Tunable Diode Laser Absorption Spectroscopy (TDLAS) technology, incorporating heating to enhance stability, anti-interference capabilities, and long-term reliability. The core principle of the heated laser methane detector alarm in measuring methane concentration is to measure the concentration through the specific absorption characteristics of laser light and methane gas. Methane (CH4) has a characteristic absorption peak in the near-infrared band (around 1653 nm). The sensor uses a tunable semiconductor laser (DFB) matched to this wavelength, emitting a narrow-linewidth laser beam precisely aligned with the methane absorption line. According to Beer-Lambert Law, the light intensity attenuation after the laser passes through a methane-containing gas is proportional to the methane concentration. By detecting the light intensity attenuation and combining it with the known absorption coefficient and optical path length, the methane concentration can be deduced. Therefore, the laser methane detector alarm can monitor the methane gas concentration in the environment in real time. When the methane concentration exceeds the alarm threshold, the alarm will sound immediately, preventing the risk of fire due to methane leakage.

[0003] Because the heated laser methane detector alarm is aimed only at the methane absorption line, this type of alarm has many advantages such as good anti-interference ability, wide range, low false alarm rate, and long life.

[0004] However, due to the influence of external environmental factors such as temperature, humidity, and pollution, the accuracy and reliability of heated laser methane detectors have been challenged. To address the problem of low detection accuracy caused by environmental factors such as contamination and condensation in heated laser methane sensors, existing technologies, such as Chinese Utility Model Patent CN221038704U (announcement date 2024-05-28), disclose a laser methane sensor employing a waterproof and breathable membrane; and Chinese Utility Model Patent CN219046073U (announcement date 2023-05-19), disclose a laser methane sensor including a waterproof and breathable membrane and a decondensation unit. Through physical protection, the decondensation unit and its spatial gaps, and the structure and cooperation between the upper and lower filters, the problems of low measurement accuracy caused by condensation due to humidity and blockage of the air inlet are improved. However, in order to ensure the accuracy of methane concentration detection, both patent documents rely too heavily on external factors such as the fit between the waterproof and breathable membrane, the upper and lower filter layers, and the gaps between the structures. This structure is too complex and has problems such as complicated processes, increased costs, and low production efficiency.

[0005] Furthermore, heated laser methane detectors often experience laser center wavelength drift during prolonged continuous operation. If the wavelength drift is minor, it reduces measurement sensitivity and leads to inaccurate results. However, severe wavelength drift, deviating from the gas absorption line, can result in no gas detection, system malfunction, and failure. Without laser wavelength feedback, users cannot detect the wavelength shift, leading to missed detections when attempting to use the instrument at this point.

[0006] In order to solve the above problems, people have been seeking an ideal technological solution. Summary of the Invention

[0007] The purpose of this invention is to address the shortcomings of existing technologies by providing a heating laser methane detection and alarm device that is simple in structure and capable of more accurate detection.

[0008] To achieve the above objectives, this utility model provides a heated laser methane detection alarm device, which includes a heated laser detection sensor, a probe temperature and humidity controller, and an ARM processor;

[0009] The heated laser detection sensor includes a gas chamber, a heated laser, and a photodetector;

[0010] The heated laser and the photodetector are symmetrically arranged at both ends of the gas chamber;

[0011] The probe temperature and humidity controller is provided in two parts, symmetrically arranged on the outer side of the heating laser and the photodetector. It is used to detect the temperature and humidity at both ends of the outer side of the heating laser detection sensor, and to regulate the temperature and humidity at both ends of the heating laser detection sensor when the temperature exceeds the threshold.

[0012] The ARM processor is connected to the heated laser and the photodetector via a signal processing module to control the heated laser to emit a detection laser and to receive the photoelectric signal output by the photodetector, and to calculate the methane concentration in the gas chamber based on the photoelectric signal.

[0013] The ARM processor is also connected to the probe temperature and humidity controller via a signal processing module to control the probe temperature and humidity controller to perform corresponding adjustments.

[0014] The ARM processor is also communicatively connected to an alarm module to issue an alarm when the methane concentration exceeds the alarm threshold.

[0015] Based on the above, the heated laser methane detection alarm device also includes an ambient temperature controller;

[0016] The ambient temperature controller is located outside the gas chamber and is connected to the ARM processor via a signal processing module to obtain the temperature information of the environment in which the heated laser methane detection alarm device is located.

[0017] Based on the above, the temperature sensor used in the ambient temperature controller is an NTC thermistor with a negative temperature coefficient.

[0018] Based on the above, the probe temperature and humidity controller includes a temperature and humidity sensor for temperature and humidity detection and a heating resistor for heating.

[0019] Based on the above, the heated laser methane detection alarm device also includes an auxiliary detection module;

[0020] The auxiliary detection module is connected to the ARM processor via a signal processing module and is used to detect and output the methane gas concentration in the current environment to the ARM processor.

[0021] The ARM processor compares the methane gas concentration detected by the auxiliary detection module with the methane gas concentration detected by the heated laser detection sensor. If the difference in methane gas concentration between the two exceeds a preset value, the ARM processor runs a preset calibration algorithm to calibrate the output wavelength of the heated laser.

[0022] Based on the above, the sensor used for methane detection in the auxiliary detection module is an electrochemical methane sensor or a semiconductor methane sensor.

[0023] Based on the above, the heated laser methane detection alarm device includes a housing consisting of an upper housing cover, an upper housing, a circuit board, a lower housing, and a mounting plate;

[0024] The heated laser detection sensor, the probe temperature and humidity controller, the signal processing module, and the auxiliary detection module are mounted on the circuit board;

[0025] The upper housing and the lower housing form a cavity, and the circuit board is disposed in the cavity;

[0026] The upper housing cover plate is installed on the upper housing corresponding to the gas chamber to form a closed gas chamber; the upper housing cover plate is provided with diffusion holes for the gas to be detected to enter and exit.

[0027] The mounting plate is used to hang and install the heated laser methane detection alarm device, and is connected to the lower housing by a connecting buckle.

[0028] Based on the above, the auxiliary detection module adopts an independent air chamber structure.

[0029] Based on the above, the heated laser methane detection alarm device also includes a wireless communication module and a wired communication interface;

[0030] The wired communication interface is connected to the ARM processor to provide an interface for wired connection between the heated laser methane detection alarm device and other devices.

[0031] The wireless communication module is communicatively connected to the ARM processor to enable wireless communication between the heated laser methane detection alarm device and the cloud platform.

[0032] Based on the above, the wireless communication mode of the wireless communication module is one or more combinations of 4G, NB, WiFi, Zigbee, Z-Wave, RF433, Lora, Bluetooth, Thread, Sigfox, and WISUN.

[0033] This utility model has substantial features and advancements compared to the prior art, specifically:

[0034] (1) The heating laser methane detection alarm device of this utility model can prevent water vapor and pollution by adopting dual probe temperature control, so that the heating laser detection sensor is not affected by external water vapor and pollution. At the same time, the high temperature sintering of residual attached substances achieves the effect of self-cleaning. The ambient temperature control can keep the heating laser detection sensor in a near constant temperature environment and the installation position is not limited by conditions.

[0035] (2) By setting up an auxiliary detection module, this utility model can monitor whether the output wavelength of the heating laser has drifted, effectively solving the problem that laser accuracy drift cannot be detected in time.

[0036] (3) The heating laser detection sensor and the auxiliary detection module of this utility model both adopt an independent gas chamber structure. That is, the composite method of the heating laser detection sensor and the auxiliary detection module adopts a split structure, which effectively solves the problem of mutual interference between sensors during detection.

[0037] (4) The auxiliary detection module, probe temperature and humidity controller, ambient temperature controller, and wireless communication module of this utility model can all be dynamically configured according to actual market demand. Therefore, it can save costs and can be widely used in low-cost designs. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the structure of the heating laser in this utility model.

[0039] Figure 2 This is a schematic diagram of the topology of the heating laser methane detection and alarm device of this utility model.

[0040] Figure 3 This is an explosion diagram of the heating laser methane detection and alarm device of this utility model.

[0041] Figure 4 This is a schematic cross-sectional view of the heating type laser detection sensor of this utility model.

[0042] Figure 5 This is a three-dimensional schematic diagram of the circuit board of this utility model.

[0043] Figure 6 This is a schematic diagram of the composition of the heating laser methane detection alarm device of this utility model.

[0044] In the diagram: 2. Probe temperature and humidity controller; 3. Ambient temperature controller; 4. Auxiliary detection module; 4-1. Air inlet / outlet; 5. ARM processor; 6. Heated laser detection sensor; 6-1. Heated laser; 6-2. Photodetector; 6-3. Air chamber; 7. Power supply module; 8. Signal processing module; 9. Wired communication interface; 10. Alarm module; 11. Wireless communication module; 12. Housing; 12-1. Upper housing; 12-2. Lower housing; 12-3. Mounting plate; 12-4. Upper housing cover; 12-5. Circuit board;

[0045] 1-1. Tube socket; 1-2. Tube cap; 1-3. Tube pin; 1-4. Lens; 1-5. Laser chip; 1-6. Thermistor II; 1-7. Heating resistor; 1-8. Optical path reversal structure; 1-9. Heat sink; 1-10. Thermistor I. Detailed Implementation

[0046] The technical solution of this utility model will be further described in detail below through specific embodiments.

[0047] The terms “comprising” and “having”, and any variations thereof, in the specification and claims of this application are intended to cover non-exclusive inclusion.

[0048] To facilitate understanding, the interactive parties and / or terms and / or custom terms involved in this invention will first be explained in conjunction with the technical solution of this invention:

[0049] Heated laser: Includes lens 1-4, laser chip 1-5, thermistor II 1-6, thermistor I 1-10, heating resistor 1-7, optical path reversing structure 1-8, heat sink 1-9, cap 1-2, base 1-1, and pins 1-3, etc. The heat sink 1-9 is mounted on the base 1-1. The laser chip 1-5, thermistor II 1-6, heating resistor 1-7, and optical path reversing structure 1-8 are mounted on the heat sink 1-9. Lens 1-4 is embedded in the cap 1-2. The cap 1-2 and the base 1-1 are sealed together, as shown in the attached diagram. Figure 1 As shown; laser chip 1-5 is used to output laser light, optical path reversing structure 1-8 is used to change the laser light emitted by the laser chip from horizontal to vertical emission, lens 1-4 is used to shape the laser beam, heating resistor 1-7 is used to increase the internal temperature of the heated laser, thermistor II 1-6 is used to detect the internal temperature of the heated laser, heat sink 1-9 is used to absorb the heat generated when the laser is working and quickly dissipate the heat to ensure the normal operation of the laser; thermistor I 1-10: placed near the heated laser, used to detect the ambient temperature around the heated laser. Example 1

[0050] Please see Figure 2 As shown in the figure, this embodiment provides an implementation method for a heated laser methane detection alarm device.

[0051] A heated laser methane detection alarm device includes a heated laser detection sensor, a probe temperature and humidity controller, and an ARM processor;

[0052] The heated laser detection sensor includes a gas chamber, a heated laser, and a photodetector;

[0053] The heated laser and the photodetector are symmetrically arranged at both ends of the gas chamber;

[0054] The probe temperature and humidity controller is provided in two parts, symmetrically arranged on the outer side of the heating laser and the photodetector. It is used to detect the temperature and humidity at both ends of the outer side of the heating laser detection sensor, and to regulate the temperature and humidity at both ends of the heating laser detection sensor when the temperature exceeds the threshold.

[0055] The ARM processor is connected to the heated laser and the photodetector via a signal processing module to control the heated laser to emit a detection laser and to receive the photoelectric signal output by the photodetector, and to calculate the methane concentration in the gas chamber based on the photoelectric signal.

[0056] The ARM processor is also connected to the probe temperature and humidity controller via a signal processing module to control the probe temperature and humidity controller to perform corresponding adjustments.

[0057] The ARM processor is also communicatively connected to an alarm module to issue an alarm when the methane concentration exceeds the alarm threshold.

[0058] When the heated laser detection sensor has condensation or deposits due to a humid external environment, the temperature and humidity controller on the probe can perform high-temperature evaporation and sintering of pollutants for self-cleaning, achieving the effect of waterproofing and anti-pollution.

[0059] In some exemplary embodiments, the probe temperature and humidity controller includes a temperature and humidity sensor for temperature and humidity detection and a heating resistor for heating.

[0060] The heated laser methane detection alarm device of this embodiment can maintain the temperature and humidity near the heated laser detection sensor within the target range simply by setting two probe temperature and humidity controllers. Compared with the complex solutions of existing technologies that prevent water from entering the laser through external factors such as waterproof and breathable membranes, upper and lower filter layers, and the fit between structural gaps, the device of this embodiment has a simple structure, lower cost, and higher production efficiency.

[0061] In some exemplary embodiments, the heated laser methane detection alarm device further includes a wireless communication module;

[0062] The wireless communication module is communicatively connected to the ARM processor to enable wireless communication between the heated laser methane detection alarm device and the cloud platform. Specifically, the wireless communication module can use one or more combinations of 4G, NB, WiFi, Zigbee, Z-Wave, RF433, LoRa, Bluetooth, Thread, Sigfox, and WISUN. In actual communication, the appropriate method can be selected based on the specific network conditions at the installation site.

[0063] In some exemplary embodiments, the heated laser methane detection alarm device also includes a wired communication interface;

[0064] The wired communication interface is connected to the ARM processor to provide an interface for wired connection between the heated laser methane detection alarm device and other devices.

[0065] In some exemplary embodiments, the alarm module includes an indicator light and a buzzer. When an alarm is triggered, the indicator light flashes, and the buzzer sounds an alarm. In specific implementations, the alarm indicator light can also be configured with different indication methods.

[0066] In some exemplary embodiments, the heated laser methane detection alarm device further includes a battery-powered module for providing power.

[0067] The working principle of the heated laser methane detection and alarm device in this embodiment:

[0068] Because methane (CH4) has a characteristic absorption peak (pit) in the near-infrared band (such as around 1653nm), the light intensity of a laser with a wavelength of around 1653nm will decrease when it passes through methane gas. The degree of light intensity decrease is proportional to the methane concentration.

[0069] When there is a certain concentration of methane in the gas chamber, the heating laser emits a laser with a wavelength of approximately 1653nm and a first intensity. As the laser passes through the methane gas in the chamber, the first intensity laser attenuates to a second intensity before being received by the laser receiver. The first and second intensity information are processed by the signal processing module and then sent to the ARM processor for calculation to determine the degree of intensity attenuation and thus the methane concentration. When the ARM processor determines that the methane concentration exceeds the alarm threshold, it controls the alarm module to issue an alarm notification. Simultaneously, it also uploads the methane concentration and alarm information to the cloud platform for remote monitoring via the wireless communication module; or it transmits the alarm information to other devices for local linkage control via the wired communication interface. For example, after detecting an excessive methane concentration in the kitchen, the alarm information is transmitted to the local valve control system via the wired communication interface to control the gas valve to close. Example 2

[0070] To address the accuracy drift problem of laser sensors, this embodiment provides a heated laser methane detection alarm device with an auxiliary detection module, based on Embodiment 1.

[0071] The auxiliary detection module is connected to the ARM processor via a signal processing module and is used to detect and output the methane gas concentration in the current environment to the ARM processor.

[0072] The ARM processor compares the methane gas concentration detected by the auxiliary detection module with the methane gas concentration detected by the heated laser detection sensor. If the difference in methane gas concentration between the two exceeds a preset value, the ARM processor runs a preset calibration algorithm to calibrate the output wavelength of the heated laser.

[0073] Since factors such as laser aging can cause the laser's output wavelength to be outside the target wavelength range, this embodiment uses an auxiliary detection module to calibrate the laser, bringing the laser's output wavelength back into the target wavelength range and improving the accuracy of methane gas concentration measurement.

[0074] The working principle of the auxiliary detection module is as follows:

[0075] The auxiliary detection module detects and outputs the methane gas concentration in the current environment to the ARM processor in real time. When the methane gas concentration detected by the auxiliary detection module differs significantly from the methane gas concentration in the gas chamber detected by the heated laser detection sensor, it indicates that the output wavelength of the heated laser has drifted and needs to be calibrated back to the characteristic absorption peak (pit). At this time, the ARM processor runs a preset calibration algorithm (such as Chinese invention patent application CN119154086A, published on December 17, 2024, entitled "Control Method and Control System for Heated Laser") to calibrate the output wavelength of the heated laser.

[0076] In some exemplary embodiments, the sensor used for methane detection in the auxiliary detection module is an electrochemical methane sensor or a semiconductor methane sensor.

[0077] In this embodiment, the auxiliary detection module can be configured to operate simultaneously with the heated laser detection sensor, i.e., to monitor in real time whether the output wavelength of the heated laser has drifted (for example, if the auxiliary detection module can detect the methane gas concentration, but the heated laser detection sensor does not detect the methane gas concentration (i.e., the concentration is 0), it is considered that the wavelength of the heated laser detection sensor has drifted). To avoid the problem of reduced detection reliability caused by the long-term operation of the sensor used for methane detection in the auxiliary detection module, the auxiliary detection module can also be configured to operate on a timer, i.e., to periodically activate the auxiliary detection module to monitor whether the output wavelength of the heated laser has drifted. Example 3

[0078] To meet the constant temperature control required for the normal operation of the heated laser detection sensor, this embodiment provides a heated laser methane detection alarm device with an ambient temperature regulator, based on embodiment 2.

[0079] The ambient temperature controller is located outside the gas chamber and is connected to the ARM processor via a signal processing module to obtain the temperature information of the environment in which the heated laser methane detection alarm device is located.

[0080] In this embodiment, the ARM processor receives the actual ambient temperature value detected by the ambient temperature controller and uses the current actual ambient temperature value as a condition parameter to regulate the operating temperature of the heating laser.

[0081] In some exemplary embodiments, the ambient temperature regulator is an NTC thermistor with a negative temperature coefficient.

[0082] It should be noted that the specific installation location of the ambient temperature controller is not limited by conditions, but it should be kept at a certain distance from the heated laser to avoid cross-influence between the temperature of the heated laser and the ambient temperature. This ensures that the ambient temperature controller accurately detects the temperature of the environment where the heated laser is located, thereby accurately controlling the operating temperature of the heated laser and keeping the heated laser detection sensor in a near-constant temperature environment, further improving the accuracy of methane gas concentration measurement. Example 4

[0083] Please see Figures 3-6 As shown in the figure. This embodiment provides a specific structure of a heated laser methane detection alarm device.

[0084] Based on Embodiment 3, the heated laser methane detection alarm device also includes a housing 12 consisting of an upper housing cover plate 12-4, an upper housing 12-1, a circuit board 12-5, a lower housing 12-2, and a hanging plate 12-3;

[0085] The probe temperature and humidity controller 2, the ambient temperature controller 3, the auxiliary detection module 4, the ARM processor 5, the heated laser detection sensor 6, the power supply module 7, the signal processing module 8, the wired communication interface 9, the alarm module 10, and the wireless communication module 11 are mounted on the circuit board 12-5.

[0086] The upper housing 12-1 and the lower housing 12-2 form a cavity, and the circuit board 12-5 is disposed in the cavity;

[0087] The upper housing cover plate 12-4 is installed on the upper housing 12-1 corresponding to the gas chamber 6-3 to form a closed gas chamber; the upper housing cover plate 12-4 is provided with a diffusion vent for the gas to be detected to enter and exit.

[0088] The mounting plate 12-3 is used to hang and install the heated laser methane detection alarm device, and is connected to the lower housing 12-2 by a connecting buckle.

[0089] In this embodiment, the two side walls of the gas chamber 6-3 are tightly fitted with the upper shell 12-1, forming an independent air inlet cavity for the heated laser detection sensor. The heated laser 6-1, the gas chamber 6-3, and the photodetector 6-2 form the gas channel to be measured. Methane gas enters the gas chamber through the diffusion holes of the upper shell cover plate 12-4.

[0090] In this embodiment, the auxiliary detection module 4 also adopts an independent air chamber structure. That is, the composite of the heated laser detection sensor 6 and the auxiliary detection module 4 adopts a separate structure, which effectively solves the problem of mutual interference between sensors during detection. Specifically, the two side walls of the air chamber 6-3 are tightly fitted with the upper housing 12-1 to form an independent air intake cavity for the heated laser detection sensor. The cavity formed by the upper housing 12-1 where the auxiliary detection module 4 is located and the circuit board 12-5 is also an independent air intake cavity. At the same time, the upper housing 12-1 is also provided with air inlet and outlet holes 4-1.

[0091] In this embodiment, the probe temperature and humidity controller 2 adopts a symmetrical design structure and is integrated into both ends of the air chamber 6-3. As a result, the temperature control effect is more uniform and the protection is also enhanced.

[0092] In this embodiment, the heated laser methane detection alarm device can be hung on a wall or other location via the mounting plate 12-3.

[0093] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. A heating-type laser methane detection alarm device, characterized in that: The heated laser methane detection alarm device includes a heated laser detection sensor, a probe temperature and humidity controller, and an ARM processor; The heated laser detection sensor includes a gas chamber, a heated laser, and a photodetector; The heated laser and the photodetector are symmetrically arranged at both ends of the gas chamber; The probe temperature and humidity controller is provided in two parts, symmetrically arranged on the outer side of the heating laser and the photodetector. It is used to detect the temperature and humidity at both ends of the outer side of the heating laser detection sensor, and to regulate the temperature and humidity at both ends of the heating laser detection sensor when the temperature exceeds the threshold. The ARM processor is connected to the heated laser and the photodetector via a signal processing module to control the heated laser to emit a detection laser and to receive the photoelectric signal output by the photodetector, and to calculate the methane concentration in the gas chamber based on the photoelectric signal. The ARM processor is also connected to the probe temperature and humidity controller via a signal processing module to control the probe temperature and humidity controller to perform corresponding adjustments. The ARM processor is also communicatively connected to an alarm module to issue an alarm when the methane concentration exceeds the alarm threshold.

2. The heating-type laser methane detection alarm device according to claim 1, characterized in that: The heated laser methane detection alarm device also includes an ambient temperature controller; The ambient temperature controller is located outside the gas chamber and is connected to the ARM processor via a signal processing module to obtain the temperature information of the environment in which the heated laser methane detection alarm device is located.

3. The heating-type laser methane detection alarm device according to claim 2, characterized in that: The ambient temperature controller uses a negative temperature coefficient NTC thermistor as its temperature sensor.

4. The heating-type laser methane detection alarm device according to claim 1, characterized in that: The probe temperature and humidity controller includes a temperature and humidity sensor for temperature and humidity detection and a heating resistor for heating.

5. The heated laser methane detection alarm device according to any one of claims 1-4, characterized in that: The heated laser methane detection alarm device also includes an auxiliary detection module; The auxiliary detection module is connected to the ARM processor via a signal processing module and is used to detect and output the methane gas concentration in the current environment to the ARM processor. The ARM processor compares the methane gas concentration detected by the auxiliary detection module with the methane gas concentration detected by the heated laser detection sensor. If the difference in methane gas concentration between the two exceeds a preset value, the ARM processor runs a preset calibration algorithm to calibrate the output wavelength of the heated laser.

6. The heating-type laser methane detection alarm device according to claim 5, characterized in that: The sensor used for methane detection in the auxiliary detection module is an electrochemical methane sensor or a semiconductor methane sensor.

7. The heating-type laser methane detection alarm device according to claim 5, characterized in that: The heated laser methane detection alarm device includes a housing consisting of an upper housing cover, an upper housing, a circuit board, a lower housing, and a mounting plate; The heated laser detection sensor, the probe temperature and humidity controller, the signal processing module, and the auxiliary detection module are mounted on the circuit board; The upper housing and the lower housing form a cavity, and the circuit board is disposed in the cavity; The upper housing cover plate is installed on the upper housing corresponding to the gas chamber to form a closed gas chamber; the upper housing cover plate is provided with diffusion holes for the gas to be detected to enter and exit. The mounting plate is used to hang and install the heated laser methane detection alarm device, and is connected to the lower housing by a connecting buckle.

8. The heating-type laser methane detection alarm device according to claim 6, characterized in that: The auxiliary detection module adopts an independent air chamber structure.

9. The heating-type laser methane detection alarm device according to any one of claims 1-3, characterized in that: The heated laser methane detection alarm device also includes a wireless communication module and a wired communication interface; The wired communication interface is connected to the ARM processor to provide an interface for wired connection between the heated laser methane detection alarm device and other devices. The wireless communication module is communicatively connected to the ARM processor to enable wireless communication between the heated laser methane detection alarm device and the cloud platform.

10. The heating-type laser methane detection alarm device according to claim 9, characterized in that: The wireless communication module uses one or more of the following wireless communication methods: 4G, NB, WiFi, Zigbee, Z-Wave, RF433, Lora, Bluetooth, Thread, Sigfox, and WISUN.

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