CN108375555B - Optical fiber methane sensing module, optical fiber multi-point photoelectric methane sensor and system - Google Patents
Optical fiber methane sensing module, optical fiber multi-point photoelectric methane sensor and system Download PDFInfo
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Abstract
The invention relates to an optical fiber methane sensing module, an optical fiber multipoint photoelectric methane sensor and a system. The system is a methane sensing system which can implement remote distance and multi-channel (or multi-detection point) by optical fiber connection, the signal processing device for transmitting and receiving optical signals is connected with an optical fiber beam splitting device, and the optical signals transmitted by the signal processing device for transmitting and receiving optical signals are distributed to each optical fiber channel through the optical fiber beam splitting device and transmitted to the corresponding optical fiber methane sensing modules arranged at different detection points. The invention not only increases the integration level of the detection system, but also enlarges the coverage range of detection, improves the adaptability of the system in different occasions, and simultaneously reduces the production and processing cost.
Description
Technical Field
The invention belongs to the technical field of laser spectrum methane sensors, and particularly relates to an optical fiber methane sensing module, an optical fiber multipoint photoelectric methane sensor and an optical fiber multipoint photoelectric methane sensor system.
Background
In recent years, with the continuous promotion of the urbanization process of China, the requirements of people on the living environment and the production safety are increasingly increased. Accordingly, there is an increasing need for monitoring of various potential sources of danger. For example, urban underground pipe galleries, underground water channels, a large number of coal storage yards, garbage storage yards and other places can have methane and gas randomly, and potential dangerous sources are formed. The ability to perform a wide range, efficient and real-time detection of these sources of danger has become an increasing market need.
Among a plurality of methane detection technologies, the photoelectric technology for measuring the components and the concentration of methane based on the infrared laser spectrum absorption principle has the advantages of large concentration measurement range, high measurement precision, no need of long correction time and the like, so that the laser spectrum methane sensor can be widely applied to different production processes and the field of safety precaution.
The optical spectrum absorption methane sensor comprises an infrared spectrum absorption type and an infrared laser spectrum absorption type. Because different methane has different characteristic spectrum absorption peaks in an infrared region, when the detected methane passes through infrared light or infrared laser, the light intensity of the detected methane is modulated by the detected methane at the characteristic spectrum absorption peaks, and the amplitude of the light intensity modulation is in direct proportion to the concentration of the detected methane, so that the concentration of the detected methane can be detected by detecting and analyzing the light intensity change at the infrared absorption peaks.
In contrast, the optical spectrum absorption methane sensor has high methane cross interference resistance, and particularly, the laser spectrum methane sensor has good methane cross interference resistance. By combining modern electronic processing technology, the sensors can realize the functions of continuous testing and automatic operation of the measured methane; the method has the characteristics of automatic correction, high measurement precision and quick response time. Such sensors can be used in many industrial processes, such as industrial and mining processes in the petrochemical, mining, semiconductor industries, etc. for detection and alarm, for example, hydrogen sulfide, oxygen, carbon monoxide, carbon dioxide, chlorine, methane and combustible hydrocarbons, etc. are the main detection of methane. And is mainly used in the semiconductor industry for detecting phosphorus, arsenic, silane and other objects. These sensors may also be used for security detection and alarms in public and home environments. The household gas leakage alarm is mainly used for detecting leakage of gas, natural gas and liquefied gas and giving out safety prompts and alarms in households.
However, the methane sensor is generally used for detecting methane near the sensor, and for a large-area and long-distance actual measurement scene, a large number of point type photoelectric methane sensors are required to form a quasi-distributed multi-channel or multi-point photoelectric methane sensor system. The technical problem to be solved urgently is to meet the monitoring and control requirements of multipoint and multi-parameter gas in gas detection and industrial process control, reduce the cost of the whole system, simplify a system light source and a signal detection processing system and enhance the reliability of the system.
In summary, in the prior art, how to detect methane gas in a large-area long-distance measurement environment, the problems of low cost and high reliability are met, and an effective solution is not provided.
Disclosure of Invention
Aiming at the defects in the prior art and solving the problems of low cost and high reliability of how to detect methane gas in a large-area long-distance measurement environment in the prior art, the invention provides an optical fiber methane sensing module, an optical fiber multipoint photoelectric methane sensor and a system.
It is a first object of the present invention to provide a fiber optic methane sensing module.
In order to achieve the purpose, the invention adopts the following technical scheme:
a fiber optic methane sensing module comprising:
the optical fiber coupling device comprises a shell with a containing space, wherein an access optical fiber and a take-out optical fiber are arranged in the shell, at least two parallel gas sensing gas chambers are arranged between the access optical fiber and the take-out optical fiber, the gas sensing gas chambers are connected through the optical fiber, and a gas chamber incident light conversion unit and a gas chamber emergent light conversion unit are respectively arranged in front of and behind the gas sensing gas chambers according to the optical signal transmission direction;
the gas chamber emergent light conversion unit couples the emergent light beam of the gas sensing gas chamber into the optical fiber connected with the gas sensing gas chamber or the outgoing optical fiber.
As a further preferable scheme, the gas chamber incident light conversion unit adopts a fiber parallel light lens.
As a further preferable scheme, the air chamber emergent light conversion unit adopts a fiber focusing lens.
As a further preferred scheme, a plurality of vent holes are arranged on the side surface of the gas sensing chamber, and a metal filter screen is arranged on each vent hole.
As a further preferred scheme, the housing includes a casing, the casing is provided with an upper cover and a lower cover respectively from top to bottom to form a structure with a containing space, the upper cover is provided with a through hole, the optical fiber is connected into and out of the through hole, the lower cover is provided with a calibration nozzle with a through hole, a powder metallurgy filter screen is arranged above the calibration nozzle, and a plug is arranged between the casing and the lower cover.
As a further preferable scheme, a replaceable metal filter screen is arranged in the upper cover.
As a further preferred solution, a reference gas chamber with a temperature and pressure sensor is arranged in the housing.
The second purpose of the invention is to provide an optical fiber multipoint photoelectric methane sensor, which adopts the optical fiber methane sensing module.
In order to achieve the purpose, the invention adopts the following technical scheme:
a fiber optic multipoint photoelectric methane sensor comprising: the device comprises a plurality of optical fiber methane sensing modules, an optical fiber beam splitting device and a signal processing device for transmitting and receiving optical signals; the optical signal processing device for transmitting and receiving the optical signal is connected with the optical fiber beam splitting device, and the optical signal transmitted by the optical signal processing device for transmitting and receiving the optical signal is distributed to each optical fiber channel through the optical fiber beam splitting device and is transmitted to the corresponding optical fiber methane sensing modules arranged at different detection points.
As a further preferable scheme, the optical fiber beam splitting device adopts a 1XN optical fiber splitter, a CWDM optical fiber splitter or a plurality of optical fiber couplers.
As a further preferable scheme, the splitting ratio of the optical fiber splitting device is uniformly distributed among the channels;
or the light splitting ratio distributed among all the channels is adjusted according to the distance between the light splitting ratio and the detection point of the optical fiber methane sensing module, and the light intensity of the optical signal distributed by the channels is in direct proportion to the length of the channels.
As a further preferred scheme, the signal processing device for transmitting and receiving the optical signal comprises a microprocessor module, the microprocessor module is respectively connected with a light source module and a signal acquisition module for optical signals and temperature and air pressure through a communication module, and the microprocessor module, the communication module, the light source module and the signal acquisition module are respectively connected with a power supply module;
the microprocessor module is used for tuning a light source signal in the light source module and processing a measurement signal in the signal acquisition module;
the communication module is used for transmitting the control instruction of the microprocessor module and the measurement signal in the signal acquisition module.
As a further preferable scheme, in the case that the environmental condition of the optical fiber methane sensing module is the same as or close to the environmental condition of the signal processing device for transmitting and receiving the optical signal, the microprocessor module receives the pressure and temperature information sent by the temperature and pressure sensor of the optical fiber methane sensor, and the pressure and temperature information is used for compensating the measured gas.
As a further preferable scheme, the light source module adopts a VCSEL laser.
The third purpose of the invention is to provide an optical fiber multipoint photoelectric methane sensor system, which adopts the optical fiber multipoint photoelectric methane sensor.
The invention has the beneficial effects that:
1. the optical fiber methane sensing module, the optical fiber multipoint photoelectric methane sensor and the system adopt the uncharged methane sensor module, so that each module can be placed in any area with potential danger, such as a high electromagnetic radiation area, a flammable and combustible area, an area with potential harm to human bodies and the like.
2. The optical fiber methane sensing module, the optical fiber multipoint photoelectric methane sensor and the system adopt a passive optical fiber network structure, and each methane sensor module is connected by an optical fiber, so that each measuring point can be flexibly arranged and can be randomly placed according to the difference of the distance of the measuring point.
3. According to the optical fiber methane sensing module, the optical fiber multi-point photoelectric methane sensor and the system, the optical fiber methane sensing module of the methane sensor adopts a series connection design of two or more air chambers, so that the volume of the sensor is reduced, the absorption optical path is increased, and the detection signal-to-noise ratio and the measurement precision measurement sensitivity are improved.
4. According to the optical fiber methane sensing module, the optical fiber multipoint photoelectric methane sensor and the system, the VCSEL laser is adopted, and the optical fiber multipoint photoelectric methane sensing measurement is realized under the condition that the power consumption of the system is not increased.
Drawings
FIG. 1 is a schematic structural diagram of a fiber optic methane sensing module of the present invention;
FIG. 2 is a schematic structural diagram of a housing of the fiber optic methane sensing module of the present invention;
FIG. 3 is a schematic structural diagram of a beam splitting apparatus according to the present invention;
FIG. 4 is a schematic diagram of a signal processing apparatus for optical signal transmission and reception according to the present invention;
FIG. 5 is a schematic diagram of the system of the present invention.
The specific implementation mode is as follows:
the invention will be further illustrated with reference to the following examples and drawings:
it should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As the background suggests, if the existing single-point laser methane sensor is used to form a large-range and long-distance methane detection system, the complexity of the measurement system is greatly increased, the power consumption of the whole system is increased, and as a result, the production cost and the maintenance cost of the system are increased.
Aiming at the defects in the prior art and solving the problems of low cost and high reliability of how to detect methane gas under a multi-point, large-area and long-distance measuring environment in the prior art, the invention provides an optical fiber methane sensing module, an optical fiber multi-point photoelectric methane sensor and an optical fiber multi-point photoelectric methane sensor system.
Example 1:
the purpose of this example 1 is to provide a fiber-optic methane sensing module.
In order to achieve the purpose, the invention adopts the following technical scheme:
as shown in figures 1 and 2 of the drawings,
a fiber optic methane sensing module comprising:
the optical fiber coupling device comprises a shell with a containing space, wherein an access optical fiber and a take-out optical fiber are arranged in the shell, at least two parallel gas sensing gas chambers are arranged between the access optical fiber and the take-out optical fiber, the gas sensing gas chambers are connected through the optical fiber, and a gas chamber incident light conversion unit and a gas chamber emergent light conversion unit are respectively arranged in front of and behind the gas sensing gas chambers according to the optical signal transmission direction;
the gas chamber emergent light conversion unit couples the emergent light beam of the gas sensing gas chamber into the optical fiber connected with the gas sensing gas chamber or the outgoing optical fiber.
In this embodiment, the gas cell incident light conversion unit employs a fiber optic collimator lens. The air chamber emergent light conversion unit adopts an optical fiber focusing lens.
For example, as shown in fig. 1, the fiber methane sensing module with two gas sensing chambers has an access fiber, a first fiber parallel light lens, a first gas sensing chamber, a first fiber focusing lens, a gas sensing chamber connection fiber, a second fiber parallel light lens, a second gas sensing chamber, a second fiber focusing lens and an output fiber, which are connected in sequence, inside the housing.
The embodiment can be further improved, a plurality of vent holes are arranged on the side surfaces of the first gas sensing gas chamber and the second gas sensing gas chamber, and metal filter screens are arranged on the vent holes. And the detected methane diffuses into the gas sensing air chamber through the vent hole provided with the metal filter screen.
In this embodiment, the access fiber may be a single mode fiber or a multimode fiber; the first optical fiber parallel light lens changes an emergent light beam accessed into an optical fiber into a parallel light beam and emits the parallel light beam into the first gas sensing gas chamber; the laser beam emitted from the first gas sensing gas chamber is coupled into the gas sensing gas chamber connecting optical fiber by the first optical fiber focusing lens; the laser beam emitted from the gas sensing gas chamber connecting optical fiber is changed into parallel light beam by the second optical fiber parallel light lens and is emitted into the second gas sensing gas chamber; the laser beam emitted from the second gas sensing gas chamber is coupled into the outgoing optical fiber by the second optical fiber focusing lens; the laser beam becomes a laser beam modulated by the measured gas through the above process. The tap-off fiber then transmits the laser beam modulated by the gas under test back to the signal processing device for optical signal transmission and reception.
In the optical fiber methane sensing module, the double gas sensing chambers are adopted for increasing the optical path of the sensing chamber, increasing the testing sensitivity and improving the testing precision. Due to the adoption of the design that the gas sensing air chambers are connected with the optical fibers, the two air chambers can be installed in parallel, so that the volume of the whole optical fiber methane sensing module is reduced. Under the requirement of special measurement high precision, the invention adopts the design of multiple air chambers (more than two air chambers, such as three air chambers, four air chambers and the like which are connected in series), so that the measurement precision of gas detection can be further improved under the condition of not increasing the volume of the sensing module. At this time, factors to be considered are fabrication complexity, optical loss, and fabrication cost.
In this embodiment, all the optical fiber devices in the optical fiber methane sensing module are installed in a special housing with a receiving space, and all the optical fiber devices are installed in the methane sensing module specially designed so as to control the bending degree of the optical fiber and protect the optical fiber from being scratched when being installed. And after all the optical fiber devices are smoothly installed in the module, fixing and sealing the optical fiber devices by adopting a sealant according to a design scheme.
It should be noted that the shape of the housing of the fiber-optic methane sensing module can be adjusted according to the requirements of customers and the requirements of application scenarios, including but not limited to a cylindrical shape, an elliptic cylindrical shape, and a rectangular cylindrical shape.
As shown in fig. 2, in the optical fiber methane sensing module, a mechanical mechanism other than the optical fiber, the first optical fiber parallel light lens, the first gas sensing gas chamber, the first optical fiber focusing lens, the gas sensing gas chamber connecting optical fiber, the second optical fiber parallel light lens, the second gas sensing gas chamber, the second optical fiber focusing lens, and the outgoing optical fiber is composed of an upper cover, a housing, a temperature and pressure sensor, a powder metallurgy filter screen, a plug, a lower cover, and a calibration nozzle, wherein the housing includes a housing, the upper cover and the lower cover are respectively disposed on the upper side and the lower side of the housing to form a structure with a containing space, a through hole is disposed on the upper cover, the optical fiber is led in and out through the through hole, the calibration nozzle with a through hole is disposed on the lower cover, the powder metallurgy filter screen is disposed above the calibration nozzle, and the plug is disposed between the housing and the lower cover.
This embodiment can be further improved by providing a replaceable metal screen in the upper cover. And is used for preventing dust, impurities and the like from entering the absorption cell to pollute the optical elements in the light path.
The embodiment can be further improved, and a reference gas chamber with a temperature and pressure sensor is arranged in the fiber-optic methane sensor. And under the condition that the environmental condition of the optical fiber methane sensing module is the same as or close to the environmental condition of the signal processing device for transmitting and receiving the optical signal, the microprocessor module receives the pressure and temperature information sent by the temperature and pressure sensor of the optical fiber methane sensor and is used for compensating the measured gas.
Example 2:
the purpose of this embodiment 2 is to provide an optical fiber multi-point photoelectric methane sensor, which employs the optical fiber methane sensing module.
In order to achieve the purpose, the invention adopts the following technical scheme:
as shown in figure 5 of the drawings,
a fiber optic multipoint photoelectric methane sensor comprising: the system comprises a plurality of optical fiber methane sensing modules (optical fiber methane sensing modules 1. optical fiber methane sensing modules N), an optical fiber beam splitting device and a signal processing device for transmitting and receiving optical signals; the optical signal processing device for transmitting and receiving the optical signal is connected with the optical fiber beam splitting device, and the optical signal transmitted by the optical signal processing device for transmitting and receiving the optical signal is distributed to each optical fiber channel through the optical fiber beam splitting device and is transmitted to the corresponding optical fiber methane sensing modules arranged at different detection points.
In this embodiment, the optical fiber splitting apparatus employs a 1XN optical fiber splitter, a CWDM optical fiber splitter, or a plurality of optical fiber couplers, as shown in fig. 3. The light splitting ratio of the optical fiber beam splitting device is uniformly distributed among all the channels; or the light splitting ratio distributed among all the channels is adjusted according to the distance between the light splitting ratio and the detection point of the optical fiber methane sensing module, and the light intensity of the optical signal distributed by the channels is in direct proportion to the length of the channels.
It should be noted that the splitting ratio of the fiber splitting device is generally uniformly distributed among the channels, and for some special application requirements, the splitting ratio of the fiber splitting device can be adjusted according to different specific test environments. Generally, for a channel used at a detection point which needs to be measured relatively far away, the optical fiber length of the channel is relatively long, so that the loss of optical energy in the transmission process is relatively large, and the distributed light intensity to the channel can be relatively large.
As shown in fig. 4, the signal processing device for transmitting and receiving optical signals includes a microprocessor module, the microprocessor module is respectively connected to a light source module and a signal acquisition module for optical signals and temperature and pressure through a communication module, and the microprocessor module, the communication module, the light source module and the signal acquisition module are respectively connected to a power supply module;
the microprocessor module is used for tuning a source signal in the light source module and processing a measurement signal in the optical signal acquisition module;
the communication module is used for transmitting the control instruction of the microprocessor module and the measurement signal in the signal acquisition module.
In this embodiment, the light source module employs a VCSEL laser. The optical signal collection adopts a photoelectric detector. And the temperature and pressure signal acquisition adopts a temperature and pressure sensor. The device for transmitting and receiving the optical signals is characterized in that a near-infrared Vertical Cavity Surface Emitting Laser (VCSEL) is used as a light source module of the device, and a tuning circuit converts tuning signals into tuned optical signals through the VCSEL into access optical fibers of the optical fiber beam splitting device; the VCSEL laser is tuned by the driver circuit and emits a tuned beam that is coupled to a 1XN fiber splitter (N can be a number 2, 4, 6, …, etc.). Each of the N optical fiber channels is connected with an optical fiber interface, so that the transmitting ends of the N measuring channels are formed.
The light intensity of the tuning optical signal is distributed to each channel through the optical fiber beam splitting device and is transmitted to the corresponding methane sensing module. The laser modulated by the measured gas concentration forms a modulated light beam and is transmitted back to the signal processing device through a return optical fiber. The modulated light beam transmitted back in each channel is received by a photoelectric detector and processed by a signal processing circuit in the microprocessor module to obtain a methane concentration test result of the channel. The schematic diagram of the optical signal transmitting and receiving device is shown in fig. 4.
In the VCSEL laser optical signal transmitting and receiving processing device, each channel is also provided with another optical fiber interface which can be used for connecting the outgoing optical fiber of the optical fiber methane sensing module. The optical fiber in the optical fiber interface is connected to a photodetector. The optical signal transmitted back from the optical fiber methane sensing module is converted into an electronic signal by the photoelectric detector, and the signal is amplified, subjected to A/D conversion and then transmitted to the microprocessor module for processing.
In the optical fiber methane sensing module, one access optical fiber transmits a VCSEL light beam into the optical fiber methane sensing module, and the other access optical fiber transmits a light beam tuned by methane in the optical fiber methane sensing module back to the signal processing device.
Because the optical fiber methane sensing module and the signal processing device can be connected through the optical fiber port, the distance from the optical fiber methane sensing module to the signal processing device can be adjusted by adjusting the length of the connecting wire. Generally, the shortest distance from the fiber-optic methane sensing module to the signal processing device is 1 meter and the longest distance is 150 meters.
The position of the optical fiber methane sensing module can be designed according to the actual application requirement. For example, in the detection of a coal mining field, optical fiber methane sensing modules can be respectively placed in all places where electrical equipment is installed on coal face frames, behind the coal face frames, at the machine heads, at the tail corners, above the reversed loader, in the return air gateway and the upper corners of the coal face and on the coal face; or in the application of pipe gallery detection, put an optic fibre methane sensing module at regular intervals along the pipe gallery trend as required.
This embodiment can be further improved by providing a reference chamber with a temperature and pressure sensor within the fiber optic methane sensor. And under the condition that the environmental condition of the optical fiber methane sensing module is the same as or close to the environmental condition of the signal processing device for transmitting and receiving the optical signal, the microprocessor module receives the pressure and temperature information sent by the temperature and pressure sensor of the optical fiber methane sensor and is used for compensating the measured gas.
Example 3:
the purpose of this embodiment 3 is to provide an optical fiber multipoint photoelectric methane sensor system, based on the above embodiments 1 and 2, and using the above optical fiber multipoint photoelectric methane sensor, as shown in fig. 5.
The invention has the beneficial effects that:
1. the optical fiber methane sensing module, the optical fiber multipoint photoelectric methane sensor and the system adopt the uncharged methane sensor module, so that each module can be placed in any area with potential danger, such as a high electromagnetic radiation area, a flammable and combustible area, an area with potential harm to human bodies and the like.
2. The optical fiber methane sensing module, the optical fiber multipoint photoelectric methane sensor and the system adopt a passive optical fiber network structure, and each methane sensor module is connected by an optical fiber, so that each measuring point can be flexibly arranged and can be randomly placed according to the difference of the distance of the measuring point.
3. According to the optical fiber methane sensing module, the optical fiber multi-point photoelectric methane sensor and the system, the optical fiber methane sensing module of the methane sensor adopts a series connection design of two or more air chambers, so that the volume of the sensor is reduced, the absorption optical path is increased, and the detection signal-to-noise ratio and the measurement precision measurement sensitivity are improved.
4. According to the optical fiber methane sensing module, the optical fiber multipoint photoelectric methane sensor and the system, the VCSEL laser is adopted, and the optical fiber multipoint photoelectric methane sensing measurement is realized under the condition that the power consumption of the system is not increased.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A fiber optic methane sensing module, comprising:
the optical fiber coupling device comprises a shell with a containing space, wherein an access optical fiber and a take-out optical fiber are arranged in the shell, at least two parallel gas sensing gas chambers are arranged between the access optical fiber and the take-out optical fiber, the gas sensing gas chambers are connected through the optical fiber, and a gas chamber incident light conversion unit and a gas chamber emergent light conversion unit are respectively arranged in front of and behind the gas sensing gas chambers according to the optical signal transmission direction;
the gas chamber emergent light conversion unit couples the emergent light beam of the gas sensing gas chamber into an optical fiber connected with the gas sensing gas chamber or an outgoing optical fiber;
the shell comprises a shell body, an upper cover and a lower cover are respectively arranged on the upper part and the lower part of the shell body to form a structure with an accommodating space, a through hole is formed in the upper cover, the access optical fiber and the output optical fiber pass through the through hole, and a calibration nozzle with the through hole is arranged on the lower cover;
a replaceable metal filter screen is arranged in the upper cover; the side surface of the gas sensing gas chamber is provided with a plurality of vent holes, and metal filter screens are arranged on the vent holes;
a reference air chamber with a temperature and pressure sensor is arranged in the shell; under the condition that the environmental condition of the optical fiber methane sensing module is the same as or close to the environmental condition of the signal processing device for transmitting and receiving the optical signal, the microprocessor module receives the pressure and temperature information sent by the temperature and pressure sensor of the optical fiber methane sensing module and is used for compensating the detected gas;
the optical fiber methane sensing module can form a plurality of methane detection systems at different spatial positions in parallel through an optical fiber network;
the methane detection system comprises a signal processing device for transmitting and receiving optical signals, wherein the optical signal transmitting and receiving device is a near-infrared vertical cavity surface emitting VCSEL laser as a light source module of the device, and a tuning circuit converts tuning signals into tuned optical signals through the VCSEL laser and sends the tuned optical signals to an access optical fiber of the optical fiber beam splitting device; the VCSEL laser is tuned by the drive circuit and emits a tuned beam, which is coupled to a 1XN fiber splitter;
the air chamber incident light conversion unit adopts an optical fiber parallel light lens;
the emergent light conversion unit of the air chamber adopts an optical fiber focusing lens;
a powder metallurgy filter screen is arranged above the calibration nozzle, and a plug is arranged between the shell and the lower cover.
2. An optical fiber multipoint photoelectric methane sensor based on the optical fiber methane sensing module of claim 1, comprising: the device comprises a plurality of optical fiber methane sensing modules, an optical fiber beam splitting device and a signal processing device for transmitting and receiving optical signals; the signal processing device for transmitting and receiving the optical signals is connected with the optical fiber beam splitting device, and the optical signals transmitted by the signal processing device for transmitting and receiving the optical signals are distributed to each optical fiber channel through the optical fiber beam splitting device and are transmitted to the corresponding optical fiber methane sensing modules arranged at different detection points;
the signal processing device for transmitting and receiving the optical signal comprises a microprocessor module, and the microprocessor module receives pressure and temperature information sent by a temperature and pressure sensor of the optical fiber methane sensing module under the condition that the environmental condition of the optical fiber methane sensing module is the same as or close to that of the signal processing device for transmitting and receiving the optical signal, and is used for compensating the measured gas.
3. The optical fiber multipoint photoelectric methane sensor according to claim 2, wherein the optical fiber beam splitter employs a 1XN optical fiber splitter, a CWDM optical fiber splitter or a plurality of optical fiber couplers.
4. The optical fiber multipoint photoelectric methane sensor according to claim 2, wherein the splitting ratio of the optical fiber splitting device is uniformly distributed among the channels.
5. The optical fiber multipoint photoelectric methane sensor according to claim 2, wherein the light splitting ratio distributed among the channels is adjusted according to the distance between the detection points of the optical fiber methane sensing module, and the light intensity of the optical signal distributed by the channels is proportional to the length of the channels.
6. The optical fiber multipoint photoelectric methane sensor according to claim 2, wherein the microprocessor module is connected with the light source module and the light signal and temperature and pressure signal acquisition module through the communication module, and the microprocessor module, the communication module, the light source module and the signal acquisition module are connected with the power supply module;
the microprocessor module is used for tuning a light source signal in the light source module and processing a measurement signal in the signal acquisition module;
the communication module is used for transmitting the control instruction of the microprocessor module and the measurement signal in the signal acquisition module.
7. The optical fiber multipoint photoelectric methane sensor according to claim 6, wherein said light source module employs VCSEL laser.
8. A fiber optic multipoint photoelectric methane sensor system comprising a fiber optic multipoint photoelectric methane sensor according to any one of claims 2 to 7.
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| CN109459393A (en) * | 2018-12-25 | 2019-03-12 | 厦门蓝海之光科技有限公司 | Specific gas multiposition detection system |
| CN110118580A (en) * | 2019-05-24 | 2019-08-13 | 无锡佶达德光电子技术有限公司 | Laser detection system with environmental factor compensation |
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