CN108318196A - A kind of Passive Multipoint leakage monitoring device and method - Google Patents
A kind of Passive Multipoint leakage monitoring device and method Download PDFInfo
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- CN108318196A CN108318196A CN201711315756.5A CN201711315756A CN108318196A CN 108318196 A CN108318196 A CN 108318196A CN 201711315756 A CN201711315756 A CN 201711315756A CN 108318196 A CN108318196 A CN 108318196A
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- fiber
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- leakage monitoring
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/38—Investigating fluid-tightness of structures by using light
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- Examining Or Testing Airtightness (AREA)
Abstract
The invention discloses a kind of Passive Multipoint leakage monitoring device and methods, including demodulation host, Transmission Fibers and fiber coupler；Fiber coupler is connected by Transmission Fibers, one end connection demodulation host of Transmission Fibers, and the other end is hanging；One end of fiber coupler is the fiber end face cut flat, and the end face is as sensing probe, and the normal parallel of the end face is in the axis of optical fiber.The present invention realizes leakage monitoring using the relevance of fiber end face reflected optical power and the refractive index of its residing medium by the variation of analysis fiber end face reflected optical power.
Description
Technical field
The present invention relates to a kind of leakage monitoring device more particularly to a kind of Passive Multipoint leakage monitoring devices and method.
Background technology
In the storage either in transmission process with container or biography of various liquid such as water, alcohol, oil, chemical solution
The increase of defeated pipeline usage time, inevitably will appear leakage phenomenon, and liquid leakage is such as detected, will be caused not in time
Economic loss, for some flammable and combustible liquids, it also occur that fire, explosion etc. endanger the thing of people's property and life security
Therefore.
The main means of this situation are handled at present in addition to the artificial health status for inspecting periodically container, transmission pipeline
Outside, it is also monitored using some monitoring devices on the market.Artificially check that this method has monitoring blind spot, risk of leakage
It still has；And existing leakage monitoring device uses the sensor based on electrology characteristic, such leakage monitoring dress mostly
It sets to be difficult to use in and monitors inflammable and explosive liquid leakage, in forceful electric power magnetic environment, the working performance of critical piece sensor
It can weaken significantly, moreover, traditional leakage sensor is often just for a kind of particular liquid, applicable surface is relatively narrow.
For the deficiency of existing leakage monitoring device technology, the present invention provides a kind of multiple spot leakage that terminal is passive prisons
Device and method are surveyed, can be not only used in the adverse circumstances such as inflammable and explosive, strong electromagnetic while monitoring multiple spot leakage, may be used also
To monitor different types of liquid, applicable surface is wide, highly practical.
Invention content：
Technical problem：A kind of Passive Multipoint leakage monitoring device of present invention offer and method, can monitor residing for sensor
Whether environment occurs liquid leakage phenomenon, which can be used for same in the adverse circumstances such as inflammable and explosive, strong electromagnetic
When monitor multiple spot leakage, and the leakage situation in the various chemical solution transportational processes such as can monitor water, alcohol, oil.
Technical solution：The passive multiple spot leakage monitoring device of a kind of terminal of the present invention, including demodulation host, transmission
Optical fiber and fiber coupler；One output end end face of the fiber coupler is cut flat, the biography as leakage monitoring device
Sense probe, and the normal parallel of the end face is in the axis of optical fiber；The fiber coupler is connected by Transmission Fibers；The transmission light
Fine one end connection demodulation host, the other end are hanging.
The fiber coupler includes mainly：1X2,2X2,1X3,2X3 type, light splitting ratio include mainly 1/99,5/95,
10/90。
The output end end face includes mainly FC/PC, LC/PC, SC/PC, FC/UPC, LC/UPC, SC/UPC construction packages.
The demodulation host requires to be the (FBG) demodulator with optical fiber coupler locations ability is differentiated.
A kind of multiple spot leakage monitoring method that terminal is passive, which is characterized in that utilize fiber end face reflected optical power and its
Leakage monitoring is realized in the relevance of the refractive index of residing medium, the variation by analyzing fiber end face reflected optical power, and step is such as
Under：
Step 1, setting non-negative threshold T, setting device stop monitoring condition；
Step 2, the output end end face that will act as sensing probe are placed in air, and record demodulation host demodulates each output
The luminous power for holding end face reflection to return, is denoted as Ei 0；
Step 3, the output end end face that will act as sensing probe are placed in the environment for needing to monitor, and demodulation host monitors in real time
The luminous power that each output end end face reflection returns, is denoted as Ei t；
Step 4 judges Ei 0-Ei tAbsolute value whether be more than T, leakage of if it is alarming, and record alert data, into
Enter step 5, if being otherwise directly entered step 5；
Step 5 judges whether to meet stopping monitoring condition, if it is terminates to monitor, if otherwise return to step 3 continues
Monitoring.
Advantageous effect：Compared with prior art, the present invention beneficial effects of the present invention：1, its Monitoring Performance will not be because inflammable
The adverse circumstances such as explosive, strong electromagnetic and weaken；2, the monitoring of variety classes liquid, device construction and signal demodulation letter be can be applied to
Single, applicable surface is wide, highly practical.
Description of the drawings
Fig. 1 is the structure chart of Passive Multipoint leakage monitoring device；
Fig. 2 is the flow chart of Passive Multipoint leakage monitoring method.
Specific implementation mode
In the following with reference to the drawings and specific embodiments, the present invention is furture elucidated, it should be understood that these embodiments are merely to illustrate
It the present invention rather than limits the scope of the invention, after having read the present invention, those skilled in the art are to of the invention each
The modification of kind equivalent form falls within the application range as defined in the appended claims.
As shown in Figure 1, Passive Multipoint leakage monitoring device of the present invention includes having to differentiate optical fiber coupler locations ability
Host 1 is demodulated, which, which has, differentiates optical fiber coupler locations ability, can be OTDR demodulation, can also be OFDR solutions
It adjusts.The interface for demodulating host 1 accesses a single mode optical fiber.It connects on the optical fiber multiple fiber couplers, including the first light
Fine coupler 2, the second fiber coupler 4 ..., the n-th fiber coupler 6, above-mentioned fiber coupler can be 1*2,2*2,1*3,
The various types such as 2*3, light splitting ratio can be but not limited to 1/99,5/95,10/90, and the present embodiment is only by taking 1*2 as an example.Light
Fibre is accessed by one end of fiber coupler, and is picked out from the other end and be connected to next fiber coupler.Each fibre optical sensor
Having that one end is hanging, hanging fiber end face is the sensing probe of entire monitoring device, is trimmed to smooth clean face, this
The normal direction of a end face is parallel with the axial direction of optical fiber, and end face can be but not limited to FC/PC, LC/PC, SC/PC, FC/UPC,
The encapsulation of the various structures such as LC/UPC, SC/UPC.Therefore the first fiber coupler 2 has the first fiber end face 3, the second optical fiber coupling
There is clutch 4 second fiber end face 5, the n-th fiber coupler 6 to have the n-th fiber end face 7.Between adjacent fiber coupler away from
From can freely be arranged according to actual needs, but in order to ensure the accuracy of whole device detection, should be use up in the case of permission
Amount reduces the distance between adjacent fiber coupler.
As shown in Fig. 2, Passive Multipoint leakage monitoring method of the present invention is as follows：
1) setting device stops the condition of monitoring, while the non-negative threshold T of leakage alarm is arranged.Described device stops monitoring
Condition be the working time set manually, such as operating time 90 hours, system work stops monitoring in full 90 hours.
2) the demodulation host 1 for having resolution optical fiber coupler locations ability sends out monochromatic light, and is used as the light of sensing probe
Fine end face is placed in the air of No leakage liquid.In the intersection of air and each fiber end face, monochromatic light reflects, and one
Part light reflection is gone back.Demodulation host 1 demodulates the luminous power being reflected back from all fiber end faces, is denoted as
3) fiber end face for being used as sensing probe is placed in the environment for needing to monitor, and demodulation host monitors all defeated in real time
The luminous power that outlet end face reflection returns, is denoted as
If 4) liquid leakage not yet occurs, the luminous power that fiber end face is reflected back is identical as previous step.If having occurred
Liquid leakage covers the liquid being compromised at fiber end face, and the refractive index of endface changes at this time, leads to reflected light work(
Rate also changes therewith.JudgeAbsolute value whether be more than T, leakage of if it is alarming, record alert data simultaneously enter
Step 5) is otherwise directly entered step 5).
5) judge whether to meet and stop monitoring condition, monitor if satisfied, then it ends；On the contrary then return to step 3) continue to supervise
It surveys.
Claims (6)
1. a kind of Passive Multipoint leakage monitoring device, it is characterised in that：Including having the solution for differentiating optical fiber coupler locations ability
Adjust host (1), the demodulation host (1) piece optical fiber of access, which connects multiple fiber couplers；
Optical fiber is accessed by one end of fiber coupler, and is picked out from the other end and be connected to next fiber coupler, each optical fiber
Sensor has at least one end vacantly to form fiber end face.
2. Passive Multipoint leakage monitoring device according to claim 1, it is characterised in that：The hanging fiber end face
Normal direction is parallel with the axial direction of optical fiber.
3. Passive Multipoint leakage monitoring device according to claim 1, it is characterised in that：The fiber coupler be 1X2,
2X2,1X3 or 2X3 type, light splitting ratio are 1/99,5/95 or 10/90.
4. Passive Multipoint leakage monitoring device according to claim 1, it is characterised in that：The hanging fiber end face is
The encapsulation of FC/PC, LC/PC, SC/PC, FC/UPC, LC/UPC or SC/UPC structure.
5. a kind of Passive Multipoint leakage monitoring method according to claim 1, which is characterized in that include the following steps：
1) setting device stops the condition of monitoring, while the non-negative threshold T of leakage alarm is arranged；
2) the demodulation host (1) for having resolution optical fiber coupler locations ability sends out monochromatic light, and fiber end face is placed in No leakage
In the air of liquid, demodulation host (1) demodulates the luminous power being reflected back from all fiber end faces, is denoted as
3) then fiber end face is placed in the environment for needing to monitor, and demodulation host monitors all output end end face reflections and returns in real time
Luminous power, be denoted as
4) when liquid leakage not occurring,Absolute value whether be less than T, then enter step 5)；When liquid leakage occurs,Absolute value be more than T, this alarm leakage simultaneously records alert data, subsequently into step 5)；
5) judge whether to meet and stop monitoring condition, monitor if satisfied, then it ends；On the contrary then return to step 3) continue to monitor.
6. Passive Multipoint leakage monitoring method according to claim 5, which is characterized in that the normal side of the fiber end face
To parallel with the axial direction of optical fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711315756.5A CN108318196A (en) | 2017-12-11 | 2017-12-11 | A kind of Passive Multipoint leakage monitoring device and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711315756.5A CN108318196A (en) | 2017-12-11 | 2017-12-11 | A kind of Passive Multipoint leakage monitoring device and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111180812A (en) * | 2020-02-20 | 2020-05-19 | 上海豫源电力科技有限公司 | Battery module, assembling method thereof and leakage detection method |
| CN112129697A (en) * | 2020-08-15 | 2020-12-25 | 中北大学 | Distributed optical fiber water leakage sensor based on diode optical fiber side coupling effect |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101153827A (en) * | 2006-09-30 | 2008-04-02 | 中国石油化工股份有限公司 | Detecting system for tank bottom leakage optical fiber of atmospheric storage tank |
| CN102706514A (en) * | 2011-12-29 | 2012-10-03 | 中华电信股份有限公司 | Optical fiber water sensing system and method |
-
2017
- 2017-12-11 CN CN201711315756.5A patent/CN108318196A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101153827A (en) * | 2006-09-30 | 2008-04-02 | 中国石油化工股份有限公司 | Detecting system for tank bottom leakage optical fiber of atmospheric storage tank |
| CN102706514A (en) * | 2011-12-29 | 2012-10-03 | 中华电信股份有限公司 | Optical fiber water sensing system and method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111180812A (en) * | 2020-02-20 | 2020-05-19 | 上海豫源电力科技有限公司 | Battery module, assembling method thereof and leakage detection method |
| CN112129697A (en) * | 2020-08-15 | 2020-12-25 | 中北大学 | Distributed optical fiber water leakage sensor based on diode optical fiber side coupling effect |
| CN112129697B (en) * | 2020-08-15 | 2024-02-27 | 中北大学 | Distributed optical fiber water leakage sensor based on diode optical fiber side coupling effect |
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Application publication date: 20180724 |