Laser methane detection module and detector thereof

Abstract

The invention relates to a laser methane detection module and a detector thereof, and belongs to the technical field of hazardous gas detection. The detection module comprises a detection module, an anti-attachment module and a processing module. The detection module monitors the methane concentration in the environment in real time through a laser and a first photoelectric detector; the anti-adhesion module monitors and reduces oil stain adhesion by using heating glass, LED lamp beads and a second photoelectric detector; and the processing module realizes signal processing, temperature control and alarm prompt through the photoelectric conversion unit, the processor unit and the temperature control unit. The detector is miniaturized in overall design, low in cost and suitable for being used in small spaces such as household kitchens. High-precision methane detection is realized through a laser absorption spectrum technology, the influence of oil stains on the performance of the detection device is effectively solved by combining with the anti-adhesion module, the service life of the device is prolonged, the maintenance cost is reduced, and the requirements of household users on safety, reliability and easy maintenance of the methane detection device are met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hazardous gas detection, and particularly relates to a laser methane detection module and a detector thereof. BACKGROUND

[0002] Methane, as a common combustible gas, widely exists in small spaces such as household kitchens. The kitchen is the main place for using gas in the family. During the daily use of gas stoves, gas pipelines and other equipment, methane leakage may occur due to reasons such as pipeline aging, loose valve, and poor sealing at the connection. Methane leakage not only may cause safety accidents such as explosion, but also may have a negative impact on the environment. Therefore, real-time monitoring and accurate detection of methane are crucial.

[0003] In the kitchen environment, a large amount of oil fume and oil stains will be generated during the cooking process. These oil stains will adhere to the surfaces of various equipment, including the core components of the methane detection device, such as lasers and photodetectors. The adhesion of oil stains will directly affect the performance of the detection device, reducing the detection accuracy and reliability. Traditional methane detection devices mostly use chemical sensors or infrared absorption sensors. Although chemical sensors have low cost, their detection accuracy is limited and they are easily affected by environmental humidity, temperature and other factors; although infrared absorption sensors have high detection accuracy, their structure is complex, the cost is high, and their detection performance will also decrease significantly when facing oil stain adhesion.

[0004] In addition, these traditional detection devices usually need to be cleaned regularly to remove impurities such as oil stains, but the amount of oil stain generation cannot be controlled, and the time interval of regular cleaning is difficult to accurately grasp. If cleaning is not timely, oil stains will gradually accumulate, causing the sensitivity of the detection device to decrease, and even causing false positives or false negatives. At the same time, the action sites of lasers and photodetectors are usually small, and the cleaning process is cumbersome and easy to damage the equipment.

[0005] In the household kitchen environment, users have the demand for methane detection devices to be small, low-cost, high-reliability, and able to adapt to complex environments such as kitchens. However, most of the existing methane detection devices on the market cannot meet these requirements at the same time. Industrial-grade detection equipment, although reliable in performance, is large in size, high in cost, and requires professional technicians to operate and maintain, which is not suitable for household kitchen use. While some small household detection devices are small in size, their detection performance is often difficult to guarantee when facing the interference of kitchen oil fume and oil stains.

[0006] Therefore, it is of great practical significance to develop a methane detection device that can effectively solve the problem of oil stain adhesion and is suitable for small spaces such as household kitchens. Such a device needs to be able to operate stably in complex kitchen environments, while having the characteristics of low cost and easy maintenance to meet the actual needs of household users. SUMMARY

[0007] The present application intends to provide a laser methane detection module and a detector thereof to solve the problems of the existing conventional methane detection device in complex environments such as home kitchens, which leads to reduced detection accuracy and poor reliability due to oil contamination, and the existing detection device is difficult to meet the requirements of miniaturization, low cost and high reliability at the same time.

[0008] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a laser methane detection module, comprising a detection module, an anti-attachment module and a processing module; the detection module comprises a laser and a first photodetector, for real-time monitoring of the concentration of methane in the environment; the anti-attachment module comprises a heating glass, an LED lamp bead and a second photodetector, for monitoring and reducing oil contamination; the processing module comprises a photoelectric conversion unit, a processor unit and a temperature control unit, for signal processing, temperature control and alarm prompt.

[0009] Specifically, the laser input end is connected with a laser driving unit, and the output end is connected with a collimator, for emitting a collimated laser signal.

[0010] Specifically, the heating glass surface is coated with an oil-proof nano coating, and the heating temperature is controlled by the temperature control unit to reduce oil contamination.

[0011] Specifically, the LED lamp bead is controlled by a relay switch, for periodically emitting light signals to monitor the oil content, and triggering the temperature control unit to heat or alarm when the oil exceeds the standard.

[0012] Specifically, the photoelectric conversion unit comprises an I / V conversion circuit and an amplification filter circuit, for converting the light signals collected by the first and second photodetectors into electrical signals and processing them.

[0013] Specifically, the processor unit comprises a signal acquisition unit, a signal processing unit and a control unit, for adjusting the laser driving parameters, calculating the gas concentration and controlling the acousto-optic alarm unit and the status indicator light.

[0014] A laser methane detector comprises a device body and a laser methane detection module as claimed in any one of claims 1 to 6; the device body has a through slot in the side wall, a state indicator lamp is arranged on the side wall of the device body, working slot one and working slot two are respectively arranged at the two ends of the through slot, heating glass one and heating glass two are respectively fixedly connected to the slot openings of working slot one and working slot two, the surfaces of the heating glass one and the heating glass two are coated with an oil-proof nano coating, a laser, a collimator and an LED lamp bead are arranged in working slot one, the collimator is arranged at the top end of the laser, a photodetector one and a photodetector two are arranged in working slot two, a power supply device is arranged in the device body, a photoelectric conversion unit and a processor unit are integrated on a circuit board and placed in the device body; the center of the laser and the collimator coincides with the center line of the photodetector one, and the center of the LED lamp bead coincides with the center line of the photodetector two.

[0015] Specifically, the device body is integrated with a power supply device, a photoelectric conversion unit and a processor unit, and the detection state is displayed through the state indicator lamp.

[0016] Specifically, the detector issues an alarm through an acousto-optic alarm unit when the methane concentration exceeds the standard, and reminds the user to clean the heating glass through the state indicator lamp when the oil pollution exceeds the standard.

[0017] The principle and beneficial effects of the technical solution are as follows:

[0018] The technical solution realizes high-precision detection of the methane concentration in the environment through laser absorption spectroscopy technology, and effectively solves the influence of oil pollution in complex environments such as kitchens on the performance of the detection device in combination with the anti-attachment module. The laser in the detection module emits a laser signal of a specific wavelength, which is collimated by the collimator and passes through the methane gas in the measured environment and is received by the photodetector one. Due to the absorption characteristics of methane to the specific wavelength laser, the light signal is converted into an electric signal through the photoelectric conversion unit, and after amplification and filtering processing, the processor unit calculates the concentration of methane according to the signal change. When the concentration exceeds the set threshold, the acousto-optic alarm unit triggers an alarm to remind the user to take measures.

[0019] The anti-attachment module realizes real-time monitoring of oil pollution attachment through the cooperation of the heating glass and the LED lamp bead with the photodetector two. The surface of the heating glass is coated with an oil-proof nano coating, and the temperature control unit controls the heating temperature according to the oil pollution monitoring result to reduce the oil pollution attachment. The LED lamp bead regularly emits a light signal, and the photodetector two detects the change of the reflected light intensity. When the oil pollution exceeds the standard, the temperature control unit is triggered to heat or alarm to remind the user to clean the heating glass.

[0020] Laser absorption spectroscopy technology, with its high selectivity and sensitivity, can accurately detect low-concentration methane, effectively preventing gas leaks. The anti-adhesion module effectively eliminates the problem of oily deposits in kitchen fumes interfering with the detection device's performance, extending its lifespan and reducing maintenance costs. The device's overall compact and low-cost design makes it suitable for small spaces like home kitchens, meeting user needs for a safe, reliable, and easy-to-maintain methane detection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of the detection module of the present invention;

[0022] Figure 2 Schematic diagram of the structure of the detector provided in the embodiment of the present invention Figure One ; Figure 3 Schematic diagram of the structure of the detector provided in the embodiment of the present invention Figure Two ;

[0023] In the figure: 1. Device body; 2. Working tank 1; 3. Working tank 2; 4. Heating glass 1; 5. Heating glass 2; 6. Laser; 7. LED lamp bead; 8. Photoelectric detector 1; 9. Photoelectric detector 2; 10. Status indicator light. DETAILED DESCRIPTION

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments:

[0025] Example:

[0026] 1. Device structure and layout

[0027] like Figure 2 、 Figure 3 As shown, the detector's main body features a compact design with small overall dimensions, making it easy to install on kitchen walls, in cabinets, or near gas pipes. A through-slot runs through the sidewalls of the device, with working slots 1 and 2 defined on either side. These slots are fixedly connected to heating glass 1 and 2, respectively. Both heating glass panels are coated with an oil-repellent nano-coating to effectively reduce the adhesion of oil stains.

[0028] In the working groove one, laser, collimator and LED lamp bead are arranged in sequence. The input end of the laser is connected with the laser drive unit, which is used for receiving the scanning signal and the modulation signal, and driving the laser to work after superimposing and synthesizing the signals. The output end of the laser is connected with the collimator, which is used for collimating and emitting the laser, so that the laser beam maintains a certain directivity and spot size, so as to better pass through the methane gas in the measured environment. The input end of the LED lamp bead is connected with the relay, which is used for controlling the opening and closing of the LED lamp bead, so that it can emit light signals according to the set time interval.

[0029] The photoelectric detector one is arranged on the path of laser emission, which is used for receiving the laser signal after being absorbed by the methane gas; the photoelectric detector two is arranged on the light path of the LED lamp bead, which is used for receiving the reflected light signal to monitor the oil pollution. The device body is also provided with a power supply device to provide stable power support for the whole detector. The photoelectric conversion unit and the processor unit are integrated on the circuit board and placed in the device body to realize the processing and control functions of the signals.

[0030] The center of the laser and the collimator coincides with the center line of the photoelectric detector one, which ensures that the laser signal can be accurately received by the photoelectric detector one. The center of the LED lamp bead coincides with the center line of the photoelectric detector two, so that the light signal emitted by the LED can be effectively detected by the photoelectric detector two. The status indicator lamp is arranged on the side wall of the device body through slot, which is used for displaying different color indicator lamps according to the detection state, so that the user can easily see the working condition of the detector.

[0031] II. Working principle of detection module

[0032] As shown in Figure 1 , the core of the detection module is the laser and the photoelectric detector one. The laser selects 1654nm tunable laser, which emits laser wavelength matching the absorption characteristic wavelength of methane molecules, so as to realize the high selectivity detection of methane. The laser emits laser signal under the drive of the laser drive unit, and the laser beam passes through the methane gas in the measured environment after collimating by the collimator. Due to the absorption effect of methane molecules on the specific wavelength laser, the laser signal will attenuate after passing through the methane gas. The photoelectric detector one receives the laser signal after being absorbed by the methane gas, and converts it into an electric signal.

[0033] The I / V conversion unit in the photoelectric conversion unit converts the current signal collected by the photodetector into a voltage signal, and then the voltage signal is amplified and filtered by the amplification and filtering unit to remove noise interference and obtain a relatively pure signal. The signal acquisition unit collects the amplified and filtered signal and performs digital-to-analog conversion to convert it into a digital signal. The signal processing unit further processes the collected digital signal and calculates the concentration of methane in the environment according to the absorption characteristics of methane on laser.

[0034] The processor unit compares the calculated methane concentration with the preset concentration threshold. When the methane concentration exceeds the set threshold, the control unit triggers the acousto-optic alarm unit to issue an alarm, reminding the user that the methane concentration in the environment exceeds the standard and there may be a safety hazard that needs to be addressed in a timely manner. At the same time, the control unit can also transmit the detected methane concentration information to external devices such as smartphones, home security systems, etc. through the human-machine interface unit, making it convenient for users to remotely monitor and manage.

[0035] III. Anti-attachment module working principle

[0036] The anti-attachment module is composed of a heating glass, LED lamp beads and a photodetector two, which is used to monitor and reduce the impact of oil pollution attachment on the performance of the detection device. The surface of the heating glass is coated with an oil-repellent nano coating, which has good oil-repellent properties and can effectively reduce the adhesion of oil pollution on the glass surface. The temperature control unit controls the temperature of the heating glass according to the oil pollution monitoring results, and further reduces the attachment of oil pollution by appropriate heating temperature.

[0037] The LED lamp beads emit light signals at a set time interval under the control of the relay. Photodetector two receives the light signals emitted by the LED lamp beads after being reflected on the surface of the heating glass. When oil pollution is attached to the surface of the heating glass, the intensity of the reflected light will change. Photodetector two converts the received reflected light signal into an electrical signal and processes it through the photoelectric conversion unit.

[0038] The signal processing unit analyzes the electrical signal collected by photodetector two and determines the degree of oil pollution attachment according to the change in reflected light intensity. When the degree of oil pollution attachment exceeds the set threshold, the control unit triggers the temperature control unit to heat the heating glass, which decomposes or falls off the oil pollution at high temperature, thereby reducing the attachment of oil pollution. At the same time, the control unit can also flash the corresponding indicator light through the status indicator light unit, reminding the user that the oil pollution attachment of the heating glass exceeds the standard and needs to be wiped and cleaned.

[0039] IV. Processing module working principle

[0040] The processing module is the core control part of the entire detector, including a photoelectric conversion unit, a processor unit, and a temperature control unit. The photoelectric conversion unit is responsible for converting the optical signals collected by the first and second photoelectric detectors into electrical signals and performing preliminary processing. The I / V conversion unit converts the current signal into a voltage signal, and the amplification and filtering unit amplifies and filters the voltage signal to remove noise interference and ensure signal quality.

[0041] The processor unit is the core of the processing module, which includes a signal acquisition unit, a signal processing unit, a control unit, a human-computer interface unit, an audible and visual alarm unit, and a temperature control unit. The signal acquisition unit is responsible for acquiring the amplified and filtered electrical signal and performing digital-to-analog conversion to convert it into a digital signal for the signal processing unit to process. The signal processing unit calculates the concentration of methane and the degree of oil pollution attachment in the environment based on the absorption characteristics of methane and the influence of oil pollution attachment on reflected light intensity.

[0042] The control unit adjusts the driving signal parameters of the laser driving unit based on the results of the signal processing unit to optimize the working state of the laser and improve the detection accuracy. At the same time, the control unit also controls the working state of the audible and visual alarm unit and the temperature control unit based on the monitoring results of methane concentration and oil pollution attachment to realize real-time monitoring of environmental safety and maintenance of the device's own performance.

[0043] The human-computer interface unit is used to connect external devices to facilitate user settings and monitoring of the detector. Users can set methane concentration thresholds, oil pollution attachment thresholds, time intervals for LED light signal emission, and other parameters through the human-computer interface unit, and can also view the detector's detection data and working state in real time through external devices.

[0044] The temperature control unit accurately controls the temperature of the heating glass according to the instructions of the control unit. It heats the heating glass through a heating circuit and monitors the temperature of the heating glass in real time to ensure that the heating temperature is within the set range. When the oil pollution attachment exceeds the standard, the temperature control unit can quickly respond and timely heat the heating glass to ensure the detection performance of the device is not affected by oil pollution.

[0045] Five, device running process

[0046] During the operation of the device, the detection module and the anti-attachment module work together to realize real-time monitoring of the methane concentration in the environment and effective control of oil pollution attachment. The laser continuously emits a laser signal under the drive of the laser drive unit, and after collimation by the collimator, the laser beam passes through the methane gas in the measured environment and is received by the photodetector and converted into an electrical signal. The photoelectric conversion unit processes the electrical signal, and the signal processing unit calculates the methane concentration according to the processed signal and compares it with the preset threshold value. When the methane concentration exceeds the standard, the acousto-optic alarm unit issues an alarm to remind the user.

[0047] At the same time, the LED lamp beads in the anti-attachment module emit light signals at a set time interval, and the photodetector receives the reflected light signals and converts them into electrical signals. The signal processing unit determines the degree of oil pollution attachment according to the change in the reflected light intensity, and when the oil pollution exceeds the standard, the temperature control unit controls the heating glass to heat up, and at the same time, the status indicator light flashes to remind the user to clean the heating glass. The entire device is under the unified control of the processor unit, realizes real-time monitoring of the environmental safety and maintenance of its own performance, and ensures that the device can operate stably and reliably in complex environments such as home kitchens.

[0048] The above is only an embodiment of the present application, and well-known specific technical solutions or characteristics in the scheme are not described in detail. For those skilled in the art, without departing from the technical solutions of the present application, a number of modifications and improvements can be made, which should also be considered as the protection scope of the present application, and these will not affect the effect and practicality of the present application. The protection scope of the present application should be subject to the content of its claims, and the specific implementation mode and the like in the specification can be used to explain the content of the claims.

Claims

1. A laser methane detection module, characterized by: It includes a detection module, an anti-adhesion module and a processing module; the detection module includes a laser and a first photodetector, which are used to monitor the concentration of methane in the environment in real time; the anti-adhesion module includes heating glass, LED lamp beads and a second photodetector, which are used to monitor and reduce oil adhesion; the processing module includes a photoelectric conversion unit, a processor unit and a temperature control unit, which are used for signal processing, temperature control and alarm prompts.

2. The laser methane detection module according to claim 1, characterized in that: The laser input end is connected to the laser driving unit, and the output end is connected to the collimator, and is used to emit collimated laser signals.

3. The laser methane detection module according to claim 1, characterized in that: The surface of the heated glass is coated with an oil-proof nano-coating, and the heating temperature is controlled by a temperature control unit to reduce the adhesion of oil stains.

4. The laser methane detection module according to claim 1, characterized in that: The LED lamp beads are controlled by a relay to switch, and are used to regularly emit light signals to monitor the oil pollution content, and trigger the temperature control unit to heat or alarm when the oil pollution exceeds the standard.

5. The laser methane detection module according to claim 1, characterized in that: The photoelectric conversion unit includes an I / V conversion circuit and an amplification and filtering circuit, which are used to convert the optical signals collected by the first photodetector and the second photodetector into electrical signals and process them.

6. The laser methane detection module according to claim 1, characterized in that: The processor unit includes a signal acquisition unit, a signal processing unit and a control unit, which are used to adjust laser driving parameters, calculate gas concentration and control the sound and light alarm unit and status indicator light.

7. A laser methane detector, characterized in that: It comprises a device body and a laser methane detection module as described in any one of claims 1 to 6; a through groove running through from front to back is provided on the side wall of the device body, a status indicator light is provided on the side wall of the device body, a working groove 1 and a working groove 2 are respectively provided on the side walls at both ends of the through groove, a heating glass 1 and a heating glass 2 are respectively fixedly connected to the notches of the working groove 1 and the working groove 2, the surfaces of the heating glass 1 and the heating glass 2 are coated with an oil-proof nano-coating, a laser, a collimator and an LED lamp bead are provided in the working groove 1, the collimator is provided at the top of the laser, a photodetector 1 and a photodetector 2 are provided in the working groove 2, a power supply device is provided in the device body, a photoelectric conversion unit and a processor unit are integrated on a circuit board and placed in the device body; the centers of the laser and the collimator coincide with the center line of the photodetector 1, and the center of the LED lamp bead coincides with the center line of the photodetector 2.

8. The laser methane detector according to claim 7, characterized in that: The device body is integrated with a power supply device, a photoelectric conversion unit and a processor unit, and displays the detection status through a status indicator light.

9. The laser methane detector according to claim 7, characterized in that: The detector sends out an alarm through the sound and light alarm unit when the methane concentration exceeds the standard, and reminds the user to clean the heated glass through the status indicator light when the oil adhesion exceeds the standard.

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