CN114279964A - Laser methane leakage monitor and methane leakage monitoring method - Google Patents
Laser methane leakage monitor and methane leakage monitoring method Download PDFInfo
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- CN114279964A CN114279964A CN202111643947.0A CN202111643947A CN114279964A CN 114279964 A CN114279964 A CN 114279964A CN 202111643947 A CN202111643947 A CN 202111643947A CN 114279964 A CN114279964 A CN 114279964A
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Abstract
The invention discloses a laser methane leakage monitor, which comprises a body, a gas sensor and a gas sensor, wherein a cavity is formed in the body; the methane monitoring module is arranged in the cavity and comprises a measuring laser, a detector and a circuit board, wherein the laser and the detector are integrally mounted on the circuit board, the measuring laser emits laser, the laser irradiates a target and then reflects the laser, and the detector receives the reflected laser and obtains methane concentration information after processing; and the communication module is arranged in the chamber and used for periodically uploading the real-time gas monitoring information to an external device for storage. The invention also discloses a methane leakage monitoring method. The laser methane leakage monitor provided by the invention can achieve the effects of wide coverage range, high response speed, low cost and high reliability.
Description
Technical Field
The invention relates to the technical field of gas monitoring, in particular to a laser methane leakage monitor and a methane leakage monitoring method.
Background
With the great demand of natural gas stations, pipe networks and natural gas users on natural gas leakage monitoring, explosion accidents caused by current natural gas leakage frequently occur, and the trend of concentrating on urban sub-pipe networks and user terminals is gradually shown.
At present, a large amount of traditional thermal conductivity type, catalytic combustion type and infrared type point sensors are adopted for monitoring methane leakage. The traditional point type sensor uses a filter screen and pumps and other devices, and the problems of blockage, environmental pollution and the like easily occur.
A small amount of laser spectrum type sensors are adopted for monitoring, a small amount of laser methane point type sensors are also used for the urban sub-pipe network and the user side, the gas chambers are arranged in the point type sensors, gas detection is finished after gas is diffused to the gas chambers, and the defects of small coverage area, easiness in interference, easiness in poisoning, low response speed and the like are presented. Existing methane monitors generally limit the effectiveness and reliability of natural gas leak monitoring.
Disclosure of Invention
In view of the defects of small coverage area, easy interference, easy poisoning, low response speed and the like of the existing methane leakage detector, the invention provides the laser methane leakage monitor and the methane leakage monitoring method.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
a laser methane leakage monitor comprises a body, a gas inlet, a gas outlet and a gas outlet, wherein a cavity is formed inside the body; the methane monitoring module is arranged in the cavity and comprises a measuring laser, a detector and a circuit board, wherein the laser and the detector are integrally mounted on the circuit board, the measuring laser emits laser, the laser irradiates a target and then reflects the laser, and the detector receives the reflected laser and obtains methane concentration information after processing; and the communication module is arranged in the chamber and used for periodically uploading the real-time gas monitoring information to an external device for storage.
According to an aspect of the present invention, the methane monitoring module further includes an indication laser for indicating a direction of the measurement laser, the circuit board includes a detection receiving circuit, a laser driving circuit and a signal processing circuit, the detection receiving circuit, the laser driving circuit and the signal processing circuit are disposed behind the detector, the laser driving circuit is electrically connected to the indication laser and the tunable laser, respectively, and the detection receiving circuit is electrically connected to the detector and the signal processing circuit, respectively.
According to one aspect of the invention, the body is provided with an emitting laser light outlet, an indicating laser light outlet and a laser receiving optical window, the axes of the indicating laser and the measuring laser are arranged in parallel, the laser receiving optical window is arranged in parallel with the axes of the measuring laser light outlet and the indicating laser light outlet, the laser receiving optical window is arranged on a reflected light path of the measuring laser, the detector is arranged behind the laser receiving optical window, and the axis of the detector and the axis of the laser receiving optical window are collinear.
According to one aspect of the invention, the monitor fixing device comprises a horizontal locking device, a mounting bracket and a monitor mounting screw, wherein the horizontal locking device comprises a boss, a mounting horizontal shaft rod and a horizontal shaft locking mounting screw, the horizontal locking device is detachably connected with the mounting bracket, and the fixing device can realize any angle adjustment in two dimensions of horizontal and vertical.
According to one aspect of the invention, the body is provided with a mounting hole, the boss and the pressing piece are matched to be aligned with the mounting hole for mounting, and before the mounting screw of the monitor is not locked, the boss and the pressing piece can slide to realize the vertical angle adjustment of the monitor; before the horizontal shaft is locked by the locking and mounting screw, the boss and the mounting horizontal shaft rod can slide, so that the horizontal angle of the monitor can be adjusted; and the installation angle of the monitor is determined after the horizontal shaft locking installation screw and the monitor installation screw are locked.
In accordance with one aspect of the invention, the laser receiving optical window is a single piece of large numerical aperture aspheric and large photosurface optical lens.
According to one aspect of the invention, the system further comprises a control module for controlling the methane monitoring module to start operation and converting the monitoring data into monitoring data for storage, and the control module further comprises an early warning unit for giving an alarm when the methane concentration exceeds a set threshold value.
In accordance with one aspect of the present invention, a method of monitoring methane leak, the monitoring apparatus comprising a laser methane leak monitor, the methane leak monitor comprising a telemetric methane monitoring module, the method comprising the steps of: laser emission: the measuring laser emits laser to a target; signal processing: the detector receives laser reflected from the target, and the laser is processed and converted into methane concentration information; signal transmission: and periodically uploading the methane concentration information to an external device for storage.
According to one aspect of the invention, the method further comprises the following alarm judging step: the early warning unit gives an alarm according to a preset early warning instruction.
According to one aspect of the invention, when the methane concentration information is greater than the methane concentration value in the early warning instruction, the early warning unit gives an alarm; and when the methane concentration information is smaller than the methane concentration value in the early warning instruction, continuously monitoring the methane concentration.
The implementation of the invention has the advantages that: the laser methane leakage monitor has the characteristics of no poisoning, no interference, wide coverage range, no influence of high-temperature and high-humidity environment and higher reliability by adopting a receiving-transmitting integrated structure and a telemetering type laser spectrum gas detection technology. Visual indication laser is arranged, and the problem that the traditional laser reflection type and correlation type gas sensors are difficult to align during installation is solved. The laser receiving optical window is a single-chip aspheric surface with large numerical aperture and a large photosensitive surface optical lens, the gas detection can be completed by irradiating a common target with laser due to high detection sensitivity, the installation is convenient, and the use cost is reduced. When the monitor detects that the gas exceeds a preset alarm instruction, the alarm and the buzzer are started to realize acousto-optic multiple alarm until the alarm is relieved. Meanwhile, an internet of things module is added, real-time monitoring information can be sent to the cloud end through the internet of things, and an attendant is notified through short messages, WeChat messages, telephones and the like, so that remote monitoring can be achieved, operation is convenient, and the application range is wide.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic external view of a laser methane leak monitor according to the present invention;
FIG. 2 is a schematic cross-sectional view of a laser methane leak monitor according to the present invention;
FIG. 3 is a schematic diagram of a field installation of a laser methane leak monitor according to the present invention;
FIG. 4 is a schematic illustration of a vertical installation of a laser methane leak monitor according to the present invention;
fig. 5 is a schematic view of a hanging installation of a laser methane leakage monitor according to the present invention.
In FIGS. 1-5: laser receiving optical window 1, measure laser light-emitting window 2, instruct laser light-emitting window 3, display screen 4, set up button 5, function button 6, alarm lamp 7, mounting hole 8, receiving optical lens 9, detector 10, laser drive circuit 11, survey receiving circuit 12, alarm lamp circuit 13, display screen drive circuit 14, thing networking module 15, signal processing circuit 16, sealing plug 17, cable 18, mounted position 19, installing support 20, pressing piece 21, monitor mounting screw 22, horizontal locking device 23, locking device locking screw hole 24, fixation nut 25, horizontal axis locking mounting screw 26, installation horizontal axis pole 27, bee calling organ 28.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1-5, a laser methane leakage monitor comprises a body, the body is a case, a chamber is arranged in the case, and a measuring laser light outlet 2, an indicating laser light outlet 3 and a laser receiving optical window 1 are arranged on the case. And the methane monitoring module is arranged in the cavity and comprises a measuring laser, a detector and a circuit board, and the measuring laser and the detector are integrally installed on the circuit board. An indicator laser may also be added to indicate the direction of the measurement laser. The measuring laser emits tuning laser to a target through the measuring laser light outlet 2, the tuning laser is reflected by the target and then emitted to the laser receiving optical window 1, the tuning laser is converged to the detector 10 through the laser receiving optical window 1, and a signal output by the detector 10 is processed by the circuit board to obtain the concentration information of methane. A communication module, including wired and wireless communication module, specifically can be an thing networking module 15, thing networking module 15 sets up in this cavity for periodically upload real-time gas monitoring information to an external device and store.
When the laser methane leakage monitor works, the measuring laser emits measuring laser, the measuring laser is emitted to a target through the measuring laser light outlet 2, the measuring laser is emitted to the laser receiving optical window 1 after being reflected by the target and is converged to the detector 10 through the laser receiving optical window 1, a signal output by the detector 10 is processed through the circuit board, methane concentration is detected according to resonance absorption of methane gas to specific laser, and the measuring precision is extremely high.
In the embodiment, a laser spectrum gas detection technology is adopted, contact chemical reaction does not occur between light and gas, the components and the form of the gas to be detected cannot be influenced, and compared with a traditional gas sensor, the gas sensor has the characteristics of no poisoning, no interference, no influence of a high-temperature high-humidity environment and higher reliability. The coverage range is observed to the telemetering type is wider, compares in traditional point type diffusion type sensor, and the open path of telemetering type detects coverage range wider, and response speed is fast. Because the coverage is wider, the number of monitors required in a typical scene is less, the laser spectrum is adopted to detect the methane gas, the monitors are not required to be calibrated frequently and maintained, the problems of poor adaptability and long-time reliable work in severe environments are solved, particularly, for environments such as high dust, oil smoke and the like, the traditional point sensor uses a filter screen and a pumping device and the like, the environments such as blockage, pollution and the like easily occur, the remote-measuring type laser methane gas monitoring device does not have the devices, and the remote-measuring type laser methane gas monitoring device is suitable for long-time stable work in severe environments.
In this embodiment, the indicating laser is a laser capable of emitting visible light. For example, the indicating laser emits visible light such as red or green, and the indicating laser is pointed in line with the measuring laser for indicating the direction of the measuring laser. The axes of the indicating laser and the measuring laser are arranged in parallel and are positioned on the same plane, and the directions of the laser emitted by the indicating laser and the measuring laser are the same. Through setting up the instruction laser, aim at the difficult problem when solving traditional laser reflection formula, correlation formula gas sensor installation.
In this embodiment, the circuit board includes a detection receiving circuit 12, a laser driving circuit 11, and a signal processing circuit 16, and the circuits are integrated on one circuit board. The circuit is arranged behind the detector 10, the laser driving circuit 11 is electrically connected with the indicating laser and the measuring laser respectively, and the detection receiving circuit 12 is electrically connected with the detector 10 and the signal processing circuit 16 respectively.
Due to the reasonable layout design of the circuit board, the structure of each part is compact, and the volume is reduced.
Further, the axes of the indicating laser and the measuring laser are arranged in parallel, the axis of the laser receiving optical window 1 is arranged in parallel with the axes of the measuring laser light outlet 2 and the indicating laser light outlet 3, the laser receiving optical window 1 is arranged on a reflection light path of the measuring laser, the detector 10 is arranged behind the laser receiving optical window 1, and the axis of the detector 10 is collinear with the axis of the laser receiving optical window 1.
In this embodiment, the power supply further includes an AC-DC power supply, a power supply and cable interface is provided on the chassis, and a sealing plug 17 is surrounded outside the interface to prevent electric leakage. The power supply is connected to the telemetry methane leak monitor via a cable 18 and power and cable interface. In this embodiment, the system further includes a control module for controlling the methane monitoring module to start and operate, and converting the monitoring data into a monitoring data for storage. The control module comprises a display screen 4 and keys arranged on the case, and a display screen driving circuit 14 and a key circuit which are connected with the display screen 4 and the keys are arranged in the case. The keys are divided into a function key 6 and a setting key 5, the function key 6 is used for indicating on-off of light and switching functions, and the setting key 5 is used for setting an alarm lower limit.
The control module also comprises an early warning unit. The early warning unit comprises a warning component and a control circuit thereof. In practical application, the alarm lamp 7 is arranged on the case, and the inside of the case comprises an alarm lamp driving circuit 13 for controlling the switch of the alarm lamp 7. Furthermore, a buzzer honeycomb hole can be arranged on the case, a buzzer 28 is arranged in the case, and the alarm lamp driving circuit 13 is used for adjusting and controlling the buzzer 28.
When the monitor detects that the gas concentration exceeds the lower detection limit, the monitor performs acousto-optic double alarm, the centralized monitoring platform and the APP client side also perform synchronous alarm, and the alarm information is notified in a telephone, short message or WeChat mode to prompt a user to process in time. The design of the alarm component can find and troubleshoot dangers in time and meet actual requirements.
In this embodiment, the chassis panel design of telemetering type thing networking type laser methane leakage monitor has mounting hole 8, mounting hole 8 is the screw hole, and accessible bolt and installing support 20 cooperation are installed and are debugged at the scene.
Furthermore, in order to realize the quick installation of the telemetering type laser methane leakage monitor and the quick adjustment of the horizontal and vertical two-dimensional angles, the device also comprises a fixing device for installing and fixing the monitor, and the fixing device can realize the special arbitrary angle adjustment of the horizontal and vertical two-dimensional angles. The fixing device comprises a horizontal locking device 23 and a mounting bracket 20, the horizontal locking device comprises a boss, a mounting horizontal shaft rod 27 and a horizontal shaft locking mounting screw 26, and the horizontal locking device 23 is in threaded connection with the mounting bracket through a nut.
The horizontal locking device 23 is matched with the pressing piece 21 to be aligned with the mounting hole 8 for mounting and debugging, so that the vertical angle adjustment of the monitor is realized, and the horizontal locking device 23 is matched with the mounting horizontal shaft rod 27 to be aligned with the mounting bracket 20 for mounting and debugging, so that the horizontal angle adjustment of the monitor is realized.
Specifically, before the mounting screw 22 of the remote measurement type internet of things type laser methane leakage monitor is not locked, the boss and the pressing piece 21 can slide, so that the vertical angle adjustment of the monitor is realized. Before the horizontal shaft locking mounting screw 26 is locked, the horizontal locking device 23 and the mounting horizontal shaft rod 27 can slide, so that the horizontal angle of the monitor can be adjusted, after the adjustment is completed, the horizontal locking device 23 is detachably connected with the mounting bracket 20 through the fixing nut 25, and the horizontal shaft locking mounting screw 26 is matched, locked and fixed with the locking device locking screw hole 24. The horizontal shaft locking mounting screw 26 and the monitor mounting screw 22 are locked, the mounting angle of the monitor is determined, and the mounting bracket 20 is fixed to the mounting position 19 such as a pipeline through screws.
Through setting up special level, the arbitrary angular adjustment structure of perpendicular two-dimensional, simple to operate to installation angle easily adjusts, can satisfy the demand in different places.
In this embodiment, the receiving optical lens 9 of the laser receiving optical window 1 is preferably a single-chip optical lens with a large numerical aperture, an aspheric surface and a large photosensitive surface. The optical receiving lens used by the device is small in size and small in focal length, and the image quality is greatly improved compared with that of a traditional spherical lens, so that the size of the whole device is small, the optical receiving efficiency is not affected, and the acting distance and the measuring sensitivity can be guaranteed to be unchanged. That is, compared with the prior art, the volume of the laser methane telemetering device is greatly reduced compared with the prior art on the premise that the acting distance and the measuring sensitivity are not changed.
In this embodiment, when the monitor works, a multi-cycle accumulation weak methane gas absorption signal extraction and noise reduction technology is adopted. The laser detector 10 receives the reflected laser light, the reflected laser light contains rich information, the interference signals can be transmitted to a subsequent data processing unit after analog-to-digital sampling conversion, denoising processing and other operations, for example, the signal processing circuit 16 and the like perform data analysis to obtain methane concentration information, and the sensitivity is high.
In this embodiment, the internet of things module 15 integrates an internet of things communication chip and an antenna that support protocols such as 4G, NBIOT, LORA, and realizes connection with a wireless network. The laser methane leakage monitor periodically uploads real-time gas monitoring information to an external device through the Internet of things, and the external device can be at least one of a cloud system, a portable device, a computer system and the like. And when the monitored gas concentration exceeds the alarm lower limit, sending the gas concentration to the cloud end through the Internet of things, and informing the operator on duty through short messages, WeChat messages, telephones and the like.
In practical application, when the telemetering type internet of things laser methane leakage monitor works, the monitoring distance within 30m of a typical room does not need reflector cooperation, the laser irradiation is adjusted to a common target with a non-mirror flat surface in an installation scene, and the problem that the traditional laser reflection type and correlation type gas sensors are difficult to align when being installed is solved. For example, the monitoring distance above 50m outside the room can be selected to increase the matching of a reflector or a reflective sticker, and the advantage of wide coverage is realized.
In practical application, the remote measurement type internet of things laser methane leakage monitor supports indoor or outdoor installation, and is installed at a high position indoors, such as a position close to a ceiling, according to the characteristic that natural gas is lighter than air and diffuses upwards after leakage, and is installed above a detected key component and a pipeline when being installed outdoors. When the device is installed, visible laser indicating light is turned on, the laser indicating light is aimed at fixed entity targets such as walls, metals, pipelines and the like, and in order to achieve a longer monitoring distance, for example, more than 50m, a high-reflectivity optical corner reflector array plate and a surface-mounted light reflecting sticker can be additionally installed at the position irradiated by the laser indicating light. The laser methane monitor can be fixed by adjusting the echo signal to meet the specified requirements, and the monitor can calculate the average methane concentration by inputting the current detection path distance through the function key 6 and the setting key 5. After the debugging is finished, the monitor can be set to turn off the screen display and turn off the indicating laser, and the low-power-consumption working state is entered. When the debugging mode is in the working mode, the monitor enters the low power consumption mode, and the monitor can be powered by commercial power and can also be powered by an external battery to work for a long time.
The remote measurement type internet of things laser methane leakage monitor can also be installed at an urban gas field station or a gas user side, comprises an urban underground comprehensive pipe gallery, a gas station, an urban public space, industrial users, commercial users and the like, and is used for monitoring methane micro leakage. The system can be powered by direct current or batteries, monitoring gas concentration information, alarm information and working states are transmitted to a cloud server through the Internet of things, a centralized monitoring platform is also connected with the cloud server to acquire and display a plurality of monitor gas related data, a personal APP client is also connected with the cloud server to acquire and display multi-monitor gas related data, when the monitor detects that the gas concentration exceeds a detection lower limit, the monitor alarms in a sound-light mode, the centralized monitoring platform and the APP client alarm synchronously, and the alarm information is notified in a telephone, short message or WeChat mode to prompt a user to process in time.
The invention also discloses a methane leakage monitoring method, wherein the monitoring equipment comprises a body, the body is a case, a cavity is arranged in the case, and a measuring laser light outlet 2, an indicating laser light outlet 3 and a laser receiving optical window 1 are arranged on the case. And the methane monitoring module is arranged in the cavity and comprises a measuring laser, a detector and a circuit board, and the measuring laser and the detector are integrally installed on the circuit board. An indicator laser may also be added to indicate the direction of the measurement laser. The measuring laser emits tuning laser to a target through the measuring laser light outlet 2, the tuning laser is reflected by the target and then emitted to the laser receiving optical window 1, the tuning laser is converged to the detector 10 through the laser receiving optical window 1, and a signal output by the detector 10 is processed by the circuit board to obtain the concentration information of methane. A communication module, including wired and wireless communication module, specifically can be an thing networking module 15, thing networking module 15 sets up in this cavity for periodically upload real-time gas monitoring information to an external device and store. The methane leakage monitoring method comprises the following steps:
step S1, laser emission: the measuring laser emits laser to a target;
step S2, signal processing: the detector receives laser reflected from the target, and the laser is processed and converted into methane concentration information;
step S3, signal transmission: and periodically uploading the methane concentration information to an external device for storage.
In the method, the measuring laser emits measuring laser, the measuring laser is emitted to a target through the measuring laser light outlet 2, the measuring laser is emitted to the laser receiving optical window 1 after being reflected by the target and is converged to the detector 10 through the laser receiving optical window 1, a signal output by the detector 10 is processed through the circuit board, the methane concentration is detected according to the resonance absorption of methane gas to specific laser, and the measuring precision is extremely high. Meanwhile, the methane concentration information is periodically uploaded to an external device for storage, and real-time monitoring is carried out.
In this embodiment, the methane leakage monitoring method further includes an alarm determination step: the early warning unit gives an alarm according to a preset early warning instruction. When the methane concentration information is larger than the methane concentration value in the early warning instruction, the early warning unit gives an alarm; and when the methane concentration information is smaller than the methane concentration value in the early warning instruction, continuously monitoring the methane concentration.
The implementation of the invention has the advantages that: the remote measurement type internet of things laser methane leakage monitor has the advantages of being free of poisoning, free of interference, wide in coverage range, free of influence of high-temperature and high-humidity environment and high in reliability by adopting a receiving and sending integrated structure and a remote measurement type laser spectrum gas detection technology. Visual indication laser is arranged, and the problem that the traditional laser reflection type and correlation type gas sensors are difficult to align during installation is solved. The laser receiving optical window is a single-chip aspheric surface with large numerical aperture and a large photosensitive surface optical lens, the gas detection can be completed by irradiating a common target with laser due to high detection sensitivity, the installation is convenient, and the use cost is reduced. When the monitor detects that the gas exceeds a preset alarm instruction, the alarm and the buzzer are started to realize acousto-optic multiple alarm until the alarm is relieved. Meanwhile, an internet of things module is added, real-time monitoring information can be sent to the cloud end through the internet of things, and an attendant is notified through short messages, WeChat messages, telephones and the like, so that remote monitoring can be achieved, operation is convenient, and the application range is wide.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention disclosed herein are intended to be covered by the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A laser methane leak monitor, comprising
A body having a chamber therein;
the methane monitoring module is arranged in the cavity and comprises a measuring laser, a detector and a circuit board, wherein the laser and the detector are integrally mounted on the circuit board, the measuring laser emits laser, the laser irradiates a target and then reflects the laser, and the detector receives the reflected laser and obtains methane concentration information after processing;
and the communication module is arranged in the chamber and used for periodically uploading the real-time gas monitoring information to an external device for storage.
2. The laser methane leak monitor of claim 1, wherein the methane monitoring module further comprises an indication laser for indicating a direction of the measurement laser, the circuit board comprises a detection receiving circuit, a laser driving circuit and a signal processing circuit, the detection receiving circuit, the laser driving circuit and the signal processing circuit are arranged behind the detector, the laser driving circuit is electrically connected with the indication laser and the tunable laser respectively, and the detection receiving circuit is electrically connected with the detector and the signal processing circuit respectively.
3. The laser methane leak monitor of claim 2 wherein the body defines an emission laser exit port, an indication laser exit port, and a laser receiving optical window, the indication laser and the measurement laser being axially juxtaposed, the laser receiving optical window being axially juxtaposed with the measurement laser exit port and the indication laser exit port, the laser receiving optical window being disposed in a reflected light path of the measurement laser, the detector being disposed behind the laser receiving optical window, the detector being co-linear with the laser receiving optical window axis.
4. The laser methane leak monitor according to claim 1, further comprising a fixing device for fixing and installing the monitor, wherein the fixing device comprises a horizontal locking device, a mounting bracket and a monitor mounting screw, the horizontal locking device comprises a boss, a mounting horizontal shaft and a horizontal shaft locking the mounting screw, the horizontal locking device is detachably connected with the mounting bracket, and the fixing device can realize any angle adjustment in two dimensions of horizontal and vertical.
5. The laser methane leakage monitor according to claim 4, wherein the body is provided with a mounting hole, the boss and the pressing piece are matched to be aligned with the mounting hole, and the boss and the pressing piece can slide before the monitor mounting screw is not locked, so that the vertical angle adjustment of the monitor is realized; before the horizontal shaft is locked by the locking and mounting screw, the boss and the mounting horizontal shaft rod can slide, so that the horizontal angle of the monitor can be adjusted; and the installation angle of the monitor is determined after the horizontal shaft locking installation screw and the monitor installation screw are locked.
6. The laser methane leak monitor according to any of claims 1-5, wherein the laser receiving optical window is a monolithic large numerical aperture aspheric and large photosurface optical lens.
7. The laser methane leak monitor of claim 6 further comprising a control module that controls the methane monitoring module to start and convert the monitored data into monitored data for storage, the control module further comprising an early warning unit that issues an alarm when a set threshold for methane concentration is exceeded.
8. A method of monitoring methane leak, the monitoring apparatus comprising a laser methane leak monitor, the laser methane leak monitor comprising a methane monitoring module, the method comprising the steps of:
laser emission: the measuring laser emits laser to a target;
signal processing: the detector receives laser reflected from the target, and the laser is processed and converted into methane concentration information;
signal transmission: and periodically uploading the methane concentration information to an external device for storage.
9. The methane leak monitoring method according to claim 8, further comprising an alarm determination step of: the early warning unit gives an alarm according to a preset early warning instruction.
10. The methane leakage monitoring method according to claim 9, wherein when the methane concentration information is greater than the methane concentration value in the early warning instruction, the early warning unit gives an alarm; and when the methane concentration information is smaller than the methane concentration value in the early warning instruction, continuously monitoring the methane concentration.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115791699A (en) * | 2023-02-08 | 2023-03-14 | 山东星冉信息科技有限公司 | Methane remote measuring alarm system and method based on vertical cavity surface emission and storage medium |
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