CN209624384U - Gas leakage monitoring system - Google Patents
Gas leakage monitoring system Download PDFInfo
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- CN209624384U CN209624384U CN201821950837.2U CN201821950837U CN209624384U CN 209624384 U CN209624384 U CN 209624384U CN 201821950837 U CN201821950837 U CN 201821950837U CN 209624384 U CN209624384 U CN 209624384U
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Abstract
The utility model discloses a kind of gas leakage monitoring systems, belong to gas leakage monitoring field.The gas leakage monitoring system includes: sequentially connected laser, fibre optic sensor package, photoelectric conversion module；Sequentially connected electrical signal collection module, electronic signal processing module, alarm signal output module, electrical signal collection module are connect with photoelectric conversion module, and electronic signal processing module is connect with laser；Laser is used to emit laser to fibre optical sensor；Fibre optical sensor is for making laser generate the first interference lightwave signal, and leaking generated ultrasonic wave using gas makes laser generate the second interference lightwave signal；Photoelectric conversion module passes through electrical signal collection module transfer to electronic signal processing module for making the first interference lightwave signal, the second interference lightwave signal be converted to the first electric signal, the second electric signal；Electronic signal processing module is exported judging result by alarm signal output module for judging whether region to be monitored occurs gas leakage.
Description
Technical field
The utility model relates to gas leakage monitoring field, in particular to a kind of gas leakage monitoring system.
Background technique
For on ground pressurized gas line, for container, such as natural gas line station, shale gas gas recovery well platform
Pipeline, container in equal regions influence vulnerable to factors such as welding procedure quality, burn into pipe fitting quality and lead to gas (such as day
Right gas) leakage, this not only results in economic loss, and is also easy to produce safety accident.Therefore, it is necessary to above-mentioned zone whether
Gas leakage occurs in time, effectively monitor.
The prior art generally utilizes flow pressure table, and is judged by the methods of pressure gradient method, cross-correlation method to be monitored
Whether pressurized gas line, container in region occur gas leakage.
The existing technology has at least the following problems for designer's discovery:
The prior art only in region to be monitored pressurized gas line, container occur bulk gas leakage situation under,
It can just be monitored, have the characteristics that rate of failing to report is high.
Utility model content
The utility model embodiment provides a kind of gas leakage monitoring system, can solve above-mentioned technical problem.It is described
Technical solution is as follows:
A kind of gas leakage monitoring system, the gas leakage monitoring system include: by the sequentially connected laser of optical fiber
Device, fibre optic sensor package, photoelectric conversion module；And by the sequentially connected electrical signal collection module of electric wire, at electric signal
Module, alarm signal output module are managed, the electrical signal collection module is connect by electric wire with the photoelectric conversion module, described
Electronic signal processing module is connect by electric wire with the laser；
The laser is used to emit laser to the fibre optical sensor；
The fibre optic sensor package is used to make the laser generate first when gas leakage does not occur for region to be monitored
Interfere lightwave signal, and when gas leakage occurs for the region to be monitored, leaking generated ultrasonic wave using gas makes
Laser generates the second interference lightwave signal；
The photoelectric conversion module interferes lightwave signal, the second interference lightwave signal for receiving described first, and
The first interference lightwave signal, the second interference lightwave signal are converted to the first electric signal, the second electric signal respectively, it
First electric signal, second electric signal are passed through into the electrical signal collection module transfer to the Electric signal processing mould afterwards
Block；
The electronic signal processing module is used to adjust the frequency of the emitted laser of the laser, and according to the received electricity of institute
Signal judges whether the region to be monitored occurs gas leakage, and judging result is defeated by the alarm signal output module
Out；
Wherein, the fibre optic sensor package includes multiple fibre optical sensors；
The gas leakage monitoring system further include: be arranged by optical fiber in the laser and multiple Fibre Optical Sensors
Beam splitter between device；
The beam splitter is for making the laser beam splitter at the sub- laser of multichannel first, the first sub- laser described in the road Bing Jiangmei
It is transmitted to the corresponding fibre optical sensor；
The fibre optical sensor includes: the light beam splitting/bundling device, 2 faraday's reflecting mirrors, multiple transmission light of N × N type
Fibre, N are the integer greater than 2；
The input terminal of the smooth beam splitting/bundling device connect by optical fiber with the beam splitter, output end pass through optical fiber and
The photoelectric conversion module connection；
Each faraday's reflecting mirror passes through point of the corresponding transmission fiber and the smooth beam splitting/bundling device
Beam/conjunction beam end connection.
In a kind of possible design method, enhanced sensitivity part is provided at least one described transmission fiber.
In a kind of possible design method, the enhanced sensitivity part includes: enhanced sensitivity cylinder and is arranged in the enhanced sensitivity cylinder
On sensitive optical fibre；
First end, the second end of the sensitive optical fibre are connected with the corresponding transmission fiber.
In a kind of possible design method, the sensitive optical fibre is bend-insensitive single-mode optical fiber.
In a kind of possible design method, the fibre optical sensor further include: dustproof protecting cover；
The enhanced sensitivity part is located in the dustproof protecting cover.
In a kind of possible design method, delay optical fiber is provided at least one described transmission fiber.
In a kind of possible design method, the alarm signal output module includes: respectively by optical fiber and the electricity
Alarm, the management platform of signal processing module connection.
Technical solution bring beneficial effect provided by the embodiment of the utility model includes at least:
Gas leakage monitoring system provided by the embodiment of the utility model is matched by laser, fibre optic sensor package
It closes, so that laser is generated the first interference lightwave signal, and work as area to be monitored when gas leakage does not occur for region to be monitored
When gas leakage occurs for domain, leaking generated ultrasonic wave using gas makes laser generate the second interference lightwave signal；And it is logical
Cross the cooperation of photoelectric conversion module, electrical signal collection module, electronic signal processing module and alarm signal output module, can according to by
First interference lightwave signal, the second interference lightwave signal the first electric signal, the second electric signal for being converted to, can effectively judge to
Whether gas pressure pipeline or container in monitoring region occur gas leakage；In addition, by by electronic signal processing module 5 and swash
Light device 1 is electrically connected, and the sensitivity of gas leakage monitoring system can be improved.
In conclusion gas leakage monitoring system provided by the embodiment of the utility model, utilizes the pressed gas on ground
Pipeline, container gas leak produced by ultrasonic wave change laser phase principle, to monitor whether region to be monitored occurs gas
Body leakage, has the characteristics that high sensitivity, rate of false alarm are low, rate of failing to report is low, alarm velocity is fast, can avoid the flue that is under pressure
The influence in road, tank atmosphere leakage rate size；In addition, can avoid since fibre optical sensor is passive optical device by electromagnetism
Interference, expand use scope.
Detailed description of the invention
It, below will be to required in embodiment description in order to illustrate more clearly of the technical scheme in the embodiment of the utility model
Attached drawing to be used is briefly described, it should be apparent that, the accompanying drawings in the following description is only some realities of the utility model
Example is applied, it for those of ordinary skill in the art, without creative efforts, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the structural block diagram of gas leakage monitoring system provided by the embodiment of the utility model；
Fig. 2 is between a kind of fibre optical sensor and photoelectric conversion module, beam splitter provided by the embodiment of the utility model
Connection schematic diagram；
Fig. 3 is the structural schematic diagram of enhanced sensitivity part provided by the embodiment of the utility model；
Fig. 4 is the structural schematic diagram of another kind of fibre optical sensor provided by the embodiment of the utility model；
Fig. 5 is the structural schematic diagram of another kind of fibre optical sensor provided by the embodiment of the utility model.
Wherein, each label declaration in attached drawing is as follows:
1- laser；
2- fibre optic sensor package；
2a- fibre optical sensor；
21- light beam splitting/bundling device；
22- faraday's reflecting mirror；
23- transmission fiber；
24- enhanced sensitivity part；
241- enhanced sensitivity cylinder；
242- sensitive optical fibre；
25- dustproof protecting cover；
26- postpones optical fiber；
3- photoelectric conversion module；
4- electrical signal collection module；
5- electronic signal processing module；
6- alarm signal output module；
61- alarm；
62- manages platform；
7- beam splitter.
Specific embodiment
It is practical new to this below in conjunction with attached drawing to keep the purpose of this utility model, technical solution and advantage clearer
Type embodiment is described in further detail.
The utility model embodiment provides a kind of gas leakage monitoring system, as shown in Fig. 1, the gas leakage monitoring
System includes: by the sequentially connected laser 1 of optical fiber, fibre optic sensor package 2, photoelectric conversion module 3；And pass through electric wire
Sequentially connected electrical signal collection module 4, electronic signal processing module 5, alarm signal output module 6, electrical signal collection module 4 are logical
It crosses electric wire to connect with photoelectric conversion module 3, electronic signal processing module 5 is connect by electric wire with laser 1；Laser 1 be used for
Fibre optic sensor package 2 emits laser；Fibre optic sensor package 2 is used to make to swash when gas leakage does not occur for region to be monitored
Photogenerated first interferes lightwave signal, and when gas leakage occurs for region to be monitored, is leaked using gas generated super
Sound wave makes laser generate the second interference lightwave signal；Photoelectric conversion module 3 is for receiving the first interference lightwave signal, the second interference
Lightwave signal, and interfere lightwave signal, the second interference lightwave signal to be converted to the first electric signal, the second telecommunications respectively for first
Number, the first electric signal, the second electric signal are transmitted to electronic signal processing module 5 by electrical signal collection module 4 later；Electric signal
Processing module 5 is used to adjust the frequency of the emitted laser of laser 1, and judges that region to be monitored is according to the received electric signal of institute
No generation gas leakage, and judging result is exported by alarm signal output module 6.
The working principle with regard to gas leakage monitoring system provided by the embodiment of the utility model, which is given, below describes:
In use, first will be in the installation to region to be monitored of fibre optic sensor package 2 of the gas leakage monitoring system.It
Afterwards, the frequency of the laser to be launched of laser 1 is adjusted using electronic signal processing module 5, and utilizes laser 1 to fibre optical sensor group
Part 2 emits laser.
When in region to be monitored gas pressure pipeline or container do not occur gas leakage when, utilize fibre optic sensor package
2 make laser generate the first interference lightwave signal.And when gas leakage occurs for region to be monitored, leaked using gas caused by
Ultrasonic wave makes laser generate the second interference lightwave signal.Later, using fibre optic sensor package 2 by first interfere lightwave signal,
Second interference lightwave signal is transmitted in photoelectric conversion module 3.
First interference lightwave signal is converted to the first electric signal using photoelectric conversion module 3, and by the second interference light
Wave signal changes into the second electric signal.Later, the first electric signal or the second electric signal are transmitted to electricity by electrical signal collection module 4
In signal processing module 5, and signal demodulation, filter are carried out to the first electric signal or the second electric signal using electronic signal processing module 5
Wave, spectrum analysis, signature analysis, and then judge whether the pipeline occurs gas leakage, and processing result is passed through into alarm
Signal output module 6 exports, and alarms.
As it can be seen that gas leakage monitoring system provided by the embodiment of the utility model, passes through laser 1, fibre optical sensor group
The cooperation of part 2, so that laser is generated the first interference lightwave signal, and work as when gas leakage does not occur for region to be monitored
When gas leakage occurs for region to be monitored, leaking generated ultrasonic wave using gas believes laser generation the second interference light wave
Number；And pass through photoelectric conversion module 3, electrical signal collection module 4, electronic signal processing module 5 and alarm signal output module 6
Cooperation, can according to by first interference lightwave signal, second interference lightwave signal be converted to the first electric signal, the second telecommunications
Number, it can effectively judge whether gas pressure pipeline or container in region to be monitored occur gas leakage.In addition, by by telecommunications
Number processing module 5 and laser 1 are electrically connected, and the sensitivity of gas leakage monitoring system can be improved.
In conclusion gas leakage monitoring system provided by the embodiment of the utility model, utilizes the pressed gas on ground
Pipeline, container gas leak produced by ultrasonic wave change laser phase principle, to monitor whether region to be monitored occurs
Gas leakage, has the characteristics that high sensitivity, rate of false alarm are low, rate of failing to report is low, alarm velocity is fast, can avoid the flue that is under pressure
The influence in road, tank atmosphere leakage rate size；In addition, can avoid since fibre optical sensor is passive optical device by electromagnetism
Interference, expand use scope.
For the region that enlargement gas leakage monitoring system is monitored, in the utility model embodiment, as shown in Fig. 1,
Fibre optic sensor package 2 includes multiple fibre optical sensor 2a；Gas leakage monitoring system further include: be arranged by optical fiber in laser
Beam splitter 7 between device 1 and multiple fibre optical sensor 2a；Beam splitter 7 for making laser beam splitter at the sub- laser of multichannel first,
The sub- laser in the road Bing Jiangmei first is transmitted to corresponding fibre optical sensor 2a (referring to attached drawing 1).
It should be noted that the input terminal of each fibre optical sensor 2a is connect by optical fiber with beam splitter 7, output end is logical
Optical fiber is crossed to connect with photoelectric conversion module 3；In addition, the corresponding one first interference lightwave signal or second of each fibre optical sensor 2a
Interfere lightwave signal.
It is understood that the position installed by each fibre optical sensor 2a is different, then each fibre optical sensor 2a
The interference lightwave signal conveyed to photoelectric conversion module 3 can also be different.
By being as above arranged, in gas leakage monitoring system course of normal operation, the laser that laser 1 is emitted is through light
Beam splitter 7 is beamed into the sub- laser of multichannel first, and the sub- laser in the road Bing Jiangmei first is transmitted to corresponding fibre optical sensor 2a.When to
When gas leakage does not occur for monitoring region, so that the first sub- laser is generated the first interference light wave using each fibre optical sensor 2a and believe
Number；When gas leakage occurs for region to be monitored, gas leaks the phase that generated ultrasonic wave modulation first interferes lightwave signal
Position, so that the first interference lightwave signal generates the second interference lightwave signal.Later, using multiple fibre optical sensor 2a by multiple
One interference lightwave signal or multiple second interference lightwave signals are transmitted in photoelectric conversion module 3.
About the installation number and installation site of fibre optical sensor 2a, can basis region to be monitored the case where carry out it is specific
Setting.
In addition, the structure about fibre optical sensor 2a, the utility model embodiment is in order to guarantee that fibre optical sensor 2a has
Certain anti-polarization decay ability, provides a kind of example, and as shown in Fig. 2, fibre optical sensor 2a includes: N × N type light point
22,2 beam/bundling device 21, multiple faraday's reflecting mirrors transmission fibers 23, N are the integer greater than 2；Light beam splitting/bundling device 21
Input terminal is connect by optical fiber with beam splitter 7, and output end is connect by optical fiber with photoelectric conversion module 3；Each faraday is anti-
Mirror 22 is penetrated to connect by corresponding transmission fiber 23 with light beam splitting/bundling device 21 beam splitting/conjunction beam end.
It, will be through using light beam splitting/bundling device 21 in gas leakage monitoring system course of normal operation by being as above arranged
First sub- laser beam splitter of 7 beam splitting of beam splitter passes through corresponding biography at the sub- laser of multichannel second, the sub- laser in the road Bing Jiangmei second
Fibre 23 is lost to be transmitted in corresponding faraday's reflecting mirror 22.
Later, when gas leakage does not occur for region to be monitored, using faraday's reflecting mirror 22 to light beam splitting/bundling device 21
Reflect the second sub- laser so that the second sub- laser for being reflected through faraday's reflecting mirror 22 of multichannel in light beam splitting/bundling device 21 into
Row closes beam, and interferes, and then forms the first interference lightwave signal.
Similarly, when gas leakage occurs for region to be monitored, multiple second sub- laser are first in light beam splitting/bundling device 21
The first interference lightwave signal is formed, gas leaks generated ultrasonic wave and acts in transmission fiber 23 later, makes transmission fiber
23 vibrate, and the phase of modulation the first interference lightwave signal makes the first interference lightwave signal form the second interference lightwave signal.
Finally, first interference lightwave signal or the second interference lightwave signal are delivered to light using light beam splitting/bundling device 21
In electrotransformation module 3.
It should be noted that light beam splitting/bundling device 21 input, output end is located at the same side (such as left side in attached drawing 1
Side), beam splitting/conjunction Shu Duan is located at the other side (such as right side in attached drawing 2).
Wherein, above-mentioned faraday's reflecting mirror 22 is set as 2, can be conducive to the second sub- laser in light beam splitting/bundling device 21
Form the first interference lightwave signal, the second interference lightwave signal.
It is understood that two the second sub- laser formed in light beam splitting/bundling device 21 first interference lightwave signal or
Second interference lightwave signal.
Above-mentioned faraday's reflecting mirror 22 can be obtained by way of purchase, for example, (deep by flying rich special Optoelectronics Technology
Ditch between fields) Co., Ltd's purchase acquisition.
In addition, above-mentioned smooth beam splitting/bundling device 21 can both be split light source, conjunction beam can also be carried out to multichannel light,
If multichannel light has the condition interfered, interference light wave can be formed in light beam splitting/bundling device 21.
Light beam splitting/the bundling device 21 can be obtained by way of purchase, for example, having by flying rich special Optoelectronics Technology (Shenzhen)
The purchase of limit company obtains.
Above-mentioned smooth beam splitting/bundling device 21 can be light beam splitting/bundling device 21 of N × N type, i.e. the type light beam splitting/conjunction beam
First end, the second end of device 21 are each provided with N root optical fiber.Wherein, in order to avoid the influence of phase fading, N is greater than 2, such as sets
It is set to 3,4,5,6 etc..
Then light beam splitting/bundling device 21 based on the above-mentioned type, as shown in Fig. 2, light beam splitting/bundling device 21 first end
A piece optical fiber is connect with beam splitter 7, and remaining (N-1) root optical fiber is connect with photoelectric conversion module 3, wherein above-mentioned N root optical fiber phase
When being located at light beam splitting/between bundling device 21 and beam splitter 7, light beam splitting/between bundling device 21 and photoelectric conversion module 3 in above-mentioned
Optical fiber.In addition, light beam splitting/bundling device 21 second end by two optical fiber respectively with corresponding two faraday's reflecting mirrors 22
Connection, remaining (N-2) root optical fiber do not need to connect, wherein this two optical fiber, which are equivalent to, above-mentioned is located at two faraday's reflections
Two transmission fibers 23 between mirror 22 and light beam splitting/bundling device 21.
In order to improve the sensitivity of fibre optical sensor 2a, in the utility model embodiment, as shown in Fig. 2, at least one
Enhanced sensitivity part 24 is provided in transmission fiber 23.
About the setting number of enhanced sensitivity part 24, the multiple enhanced sensitivity parts 24 of setting can be spaced in same transmission fiber 23, with
Further increase the sensitivity of fibre optical sensor 2a.For example, 3 enhanced sensitivities can be respectively provided in each transmission fiber 23
Cylinder.
About the structure of enhanced sensitivity part 24, under the premise of simple based on structure, the utility model embodiment provides one kind and shows
Example, as shown in Fig. 3, enhanced sensitivity part 24 includes: enhanced sensitivity cylinder 241 and the sensitive optical fibre being arranged on enhanced sensitivity cylinder 241 242；
First end, the second end of sensitive optical fibre 242 are connected with corresponding transmission fiber 23.
Above-mentioned enhanced sensitivity cylinder 241 can be prepared by aluminium foil and be obtained, such enhanced sensitivity cylinder 241 has the function of by ultrasonic wave
The characteristics of easily vibrating, can further improve sensitivity of the enhanced sensitivity part 24 to ultrasonic wave.
Wherein, the thickness of enhanced sensitivity cylinder 241 may be configured as 0.1mm~0.15mm, for example, may be configured as 0.1mm,
0.11mm, 0.12mm, 0.13mm, 0.14mm, 0.15mm etc., the utility model embodiment not to the thickness of enhanced sensitivity cylinder 241 into
Row concrete restriction, as long as the sensitivity of enhanced sensitivity part 24 can be effectively increased.
In addition, the diameter of enhanced sensitivity cylinder 241 can be set to 5cm~6cm, for example, may be configured as 5cm, 5.5cm,
6cm etc..By the way that so set, being both convenient for the production of enhanced sensitivity cylinder 241, also certifiable enhanced sensitivity cylinder 241 has certain intensity.
The mode that above-mentioned sensitive optical fibre 242 can wind is arranged on enhanced sensitivity cylinder 241, by so set, can increase
The length of sensitive optical fibre 242, and then the area that ultrasonic wave acts on sensitive optical fibre 242 can be increased, enhanced sensitivity can be further increased
Sensitivity of the part 24 to ultrasonic wave.
Wherein, above-mentioned sensitive optical fibre 242 and transmission fiber 23 can be single mode optical fiber, such sensitive optical fibre 242, transmission fiber
23 have the characteristics that light decay reduction, noise are small.
Further, above-mentioned sensitive optical fibre 242 can be bend-insensitive single-mode optical fiber, can exist to avoid sensitive optical fibre 242
Optical attenuation on above-mentioned enhanced sensitivity cylinder 241.
In order to avoid enhanced sensitivity part 24 is influenced by external environment and breakage occurs, it is such as attached in the utility model embodiment
Shown in Fig. 2, attached drawing 3, fibre optical sensor 2a further include: dustproof protecting cover 25；Enhanced sensitivity part 24 is located in dustproof protecting cover 25.
By so set, can avoid erosion of the enhanced sensitivity part 24 by sleet, dust storm etc., to extend the use of enhanced sensitivity part 24
Service life.
Wherein, it in order to which the ultrasonic wave that gas leakage generates acts on enhanced sensitivity part 24, is opened on the side wall of dustproof protecting cover 25
If multiple through-holes are arranged to reticular structure.
In addition, barrel-like structure can be set into above-mentioned dustproof protecting cover 25, the utility model embodiment is not to proofing dust and protecting
The structure of cover 25 is limited.
Due to every light circuit in fibre optical sensor 2a (i.e. each faraday's reflecting mirror 22 and light beam splitting/bundling device 21 it
Between optical path) corresponding brachium difference it is bigger so that the noise that fibre optical sensor 1 generates is bigger, therefore, the utility model is implemented
In example, as shown in Fig. 2, delay optical fiber 26 is provided at least one transmission fiber 23, to reduce the arm of fibre optical sensor 1
Difference.
Wherein, it since the corresponding brachium of every light circuit is related with the light path of every light circuit, then can be returned according to every light
The corresponding optical fiber in road (including transmission fiber 23, sensitive optical fibre 242) total length, the length of delay optical fiber 26 is arranged.
For example, as shown in figure 4, fibre optical sensor 2a includes two faraday's reflecting mirrors 22, i.e. fibre optical sensor 2a
Including light circuit 1 and light circuit 2.Wherein, two enhanced sensitivity parts 24 are set on light circuit 1,4 enhanced sensitivity parts 24 are set on light circuit 2,
And the sensitive optical fibre 242 of 50m is wound on each enhanced sensitivity part 24；In addition, the transmission fiber 23 on light circuit 1 and light circuit 2 is long
Degree is 100m.So, poor in order to compensate for the arm between light circuit 1 and light circuit 2, it is 98m that length can be arranged on light circuit 1
Delay optical fiber 26.
Delay optical fiber 26 based on above-mentioned length can wind delay optical fiber 26 for the ease of postponing the installation of optical fiber 26
On fiber disk.
In addition, above-mentioned delay optical fiber 26 can be single mode optical fiber, such delay optical fiber 26 has the spy that light decay reduces, noise is small
Point.
Based on fibre optical sensor 2a as described above, for the ease of the installation and replacement of fibre optical sensor 2a, this is practical new
In type embodiment, as described in attached drawing 5, a position-sensing unit 24 is set in a corresponding transmission fiber 23 of faraday's reflecting mirror 22,
One delay optical fiber 26 is set in another corresponding transmission fiber 23 of faraday's reflecting mirror 22.
By being as above arranged, when position-sensing unit 24 or delay optical fiber 26 breakage occurs when, can be straight under the premise of considering cost
Meet replacement fibre optical sensor 2a.
In the utility model embodiment, as shown in Fig. 1, alarm signal output module 6 includes: respectively by electric wire and electricity
Alarm 61, the management platform 62 of the connection of signal processing module 5.
As it can be seen that can remind staff that pipeline leaks in time by setting alarm 61, and pass through management platform
62, the position that gas leakage occurs in pipeline is quickly found conducive to staff, this can effectively prevent pipeline that rupture, explosion occurs
Equal danger, and then avoid causing damages to the environment and personal safety as well as the property safety of pipeline.
Wherein, electronic signal processing module 5 can pass through network interface, RS232 interface, RS485 interface, USB (Universal
Serial Bus, universal serial bus) it is communicated with alarm 61, management platform 62, convey judging result.
In addition, above-mentioned alarm 61 can be set to buzzer.
In the utility model embodiment, laser 1 can emission center wavelength can with 1309.5nm~1310.5nm,
The beams of narrow-band light of 1549.5nm~1550.5nm has the characteristics that light decay reduces, convenient for obtaining based on the latter, and the utility model is real
Example is applied preferentially to use.
Wherein, the line width for the beams of narrow-band light that above-mentioned laser 1 is emitted may be configured as 10K hertz.
In addition, laser 1 can be obtained by way of purchase, for example, can be by laser scientific and technological industry group, big nation stock
The purchase of part Co., Ltd obtains.
In the utility model embodiment, photoelectric conversion module 3 may be configured as photoelectric conversion circuit, electrical signal collection module 4
It may be configured as signal acquisition circuit.
In the utility model embodiment, every optical fiber involved in the gas leakage monitoring system (such as transmission fiber
23, sensitive optical fibre 242, delay optical fiber 36) on be respectively provided at least one layer of protective layer, to avoid optical fiber by adverse circumstances such as sleet
Damage.
About the installation of above-mentioned gas leakage monitoring system, fibre optical sensor 2a can be mounted on to gas leakage monitoring region
Interior, specifically, enhanced sensitivity part 24 is hung on bar, transmission fiber 23, delay optical fiber 26 and faraday's reflecting mirror 22 are encapsulated in
In disk wire box.In addition, the other component of gas leakage monitoring system is installed in industry control computer room.
In conclusion gas leakage monitoring system provided by the embodiment of the utility model through natural gas station actually use,
Test, can using fibre optical sensor 2a as the centre of sphere, radius 15m spheric region in, 4MPa (when leakage is greater than to leakage magnitude
Pressure), the pipe leakage of 2mm (leakage aperture) effectively monitored, high sensitivity, alarm accurately, and resists ambient noise
Interference performance is strong.
All the above alternatives can form the alternative embodiment of the disclosure, herein no longer using any combination
It repeats one by one.
The foregoing is merely the illustrative embodiments of the utility model, the protection model that is not intended to limit the utility model
It encloses, within the spirit and principle of the utility model, any modification, equivalent replacement, improvement and so on should be included in this
Within the protection scope of utility model.
Claims (7)
1. a kind of gas leakage monitoring system, which is characterized in that the gas leakage monitoring system includes: sequentially to be connected by optical fiber
Laser (1), the fibre optic sensor package (2), photoelectric conversion module (3) connect；And pass through the sequentially connected electric signal of electric wire
Acquisition module (4), electronic signal processing module (5), alarm signal output module (6), the electrical signal collection module (4) pass through electricity
Line is connect with the photoelectric conversion module (3), and the electronic signal processing module (5) is connect by electric wire with the laser (1)；
The laser (1) is used to emit laser to the fibre optic sensor package (2)；
The fibre optic sensor package (2) is used to make the laser generate first when gas leakage does not occur for region to be monitored
Interfere lightwave signal, and when gas leakage occurs for the region to be monitored, leaking generated ultrasonic wave using gas makes
The laser generates the second interference lightwave signal；
The photoelectric conversion module (3) interferes lightwave signal, the second interference lightwave signal for receiving described first, and will
The first interference lightwave signal, the second interference lightwave signal are converted to the first electric signal, the second electric signal respectively, later
First electric signal, second electric signal are transmitted to the Electric signal processing by the electrical signal collection module (4)
Module (5)；
The electronic signal processing module (5) is used to adjust the frequency of the laser (1) emitted laser, and received according to institute
Electric signal judges whether the region to be monitored occurs gas leakage, and judging result is passed through the alarm signal output module
(6) it exports；
Wherein, the fibre optic sensor package (2) includes multiple fibre optical sensors (2a)；
The gas leakage monitoring system further include: be arranged by optical fiber in the laser (1) and multiple Fibre Optical Sensors
Beam splitter (7) between device (2a)；
The beam splitter (7) is for making the laser beam splitter at the sub- laser of multichannel first, the first sub- laser described in the road Bing Jiangmei
It is transmitted to the corresponding fibre optical sensor (2a)；
The fibre optical sensor (2a) includes: light beam splitting/bundling device (21) of N × N type, 2 faraday's reflecting mirrors (22), more
A transmission fiber (23), N are the integer greater than 2；
The input terminal of the smooth beam splitting/bundling device (21) is connect by optical fiber with the beam splitter (7), and output end passes through optical fiber
It is connect with the photoelectric conversion module (3)；
Each faraday's reflecting mirror (22) passes through the corresponding transmission fiber (23) and the smooth beam splitting/bundling device
(21) beam splitting/conjunction beam end connection.
2. gas leakage monitoring system according to claim 1, which is characterized in that at least one described transmission fiber (23)
On be provided with enhanced sensitivity part (24).
3. gas leakage monitoring system according to claim 2, which is characterized in that the enhanced sensitivity part (24) includes: enhanced sensitivity
Cylinder (241) and the sensitive optical fibre (242) being arranged on the enhanced sensitivity cylinder (241)；
First end, the second end of the sensitive optical fibre (242) are connected with the corresponding transmission fiber (23).
4. gas leakage monitoring system according to claim 3, which is characterized in that the sensitive optical fibre (242) is bending
Insensitive single-mode fiber.
5. according to the described in any item gas leakage monitoring systems of claim 2~4, which is characterized in that the fibre optical sensor
(2a) further include: dustproof protecting cover (25)；
The enhanced sensitivity part (24) is located in the dustproof protecting cover (25).
6. gas leakage monitoring system according to claim 1, which is characterized in that at least one described transmission fiber (23)
On be provided with delay optical fiber (26).
7. according to claim 1~4,6 described in any item gas leakage monitoring systems, which is characterized in that the alarm signal
Output module (6) includes: the alarm (61) being connect respectively by electric wire with the electronic signal processing module (5), management platform
(62)。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821950837.2U CN209624384U (en) | 2018-11-23 | 2018-11-23 | Gas leakage monitoring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821950837.2U CN209624384U (en) | 2018-11-23 | 2018-11-23 | Gas leakage monitoring system |
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| Publication Number | Publication Date |
|---|---|
| CN209624384U true CN209624384U (en) | 2019-11-12 |
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ID=68444237
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| CN111141460A (en) * | 2019-12-25 | 2020-05-12 | 西安交通大学 | Equipment gas leakage monitoring system and method based on artificial intelligence sense organ |
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