CN204153472U - Based on the oil/gas pipe line safety monitoring system of distributing optical fiber sensing - Google Patents
Based on the oil/gas pipe line safety monitoring system of distributing optical fiber sensing Download PDFInfo
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- CN204153472U CN204153472U CN201420536383.XU CN201420536383U CN204153472U CN 204153472 U CN204153472 U CN 204153472U CN 201420536383 U CN201420536383 U CN 201420536383U CN 204153472 U CN204153472 U CN 204153472U
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Abstract
The utility model discloses a kind of oil/gas pipe line safety monitoring system based on distributing optical fiber sensing, comprise laser, first photodetector, second photodetector, 3rd photodetector, 3 × 3 Fiber Optic Coupler, one FRM and the 2nd FRM, laser, second photodetector is connected with the first via input end of 3 × 3 Fiber Optic Coupler by optical fiber circulator, first photodetector, 3rd photodetector respectively with second of 3 × 3 Fiber Optic Coupler, three road input ends are connected, the first via output terminal of 3 × 3 Fiber Optic Coupler is connected with a FRM by sensor fibre, second road output terminal of 3 × 3 Fiber Optic Coupler is connected with the 2nd FRM by optical fiber reference arm.The utility model avoids the hardware unit of loaded down with trivial details costliness, also the sensitivity of white light interferometer location technology and the double-barreled question of trap wave point aliasing has been evaded, insertion loss is less, is applicable to long distance, on a large scale oil/gas pipe line safe early warning, has a good application prospect.
Description
Technical field
The utility model relates to a kind of oil/gas pipe line safety monitoring system based on distributing optical fiber sensing, belongs to oil/gas pipe line safe early warning technical field.
Background technique
Growing along with China's economy, pipe safety especially oil/gas pipe line is the segmentation field obtaining significant concern at this for several years, if the rupture and leakage of oil/gas pipe line, resident living can be caused to suffer tremendous influence; If oil/gas pipe line wrecks, then bring huge potential safety hazard, and cause immeasurable economic loss.
As everyone knows, the alarm monitoring system of prior art is supported by multiplexer channel mostly, and this system needs to remove to control respective passage by the software of each different passage, too loaded down with trivial details from technological layer, implement also cumbersome, and the cost of foundation and maintenance is also all higher, be not suitable for applying under this long distance of oil/gas pipe line, inflammable and explosive occasion.
Along with the appearance of optical fiber sensing technology, numerous optical fiber sensing technologies such as Mach-Zehnder interference technique, white light interference technique start to be applied in this field of pipeline security protection, in addition, also have some technology combined by multiple interferometer, as Sagnac and Mach-Zehnder, Sagnac and Sagnac, abroad the current research for optical fiber security alarm technology is also a lot, also mainly interfere the fiber fence alarm technique research of class based on Sagnac, MZ, rarely have the application on monitoring pipeline safety.
Due to the more inborn limitations of respective technical know-how, for the trap wave point location technology of Mach-Zehnder New Interferometer Positioning Technique and Fiber White-light Interferometer, Mach-Zehnder New Interferometer Positioning Technique must adopt the synchronous acquisition device of two-forty, cost is higher, and along with monitoring distance be increased to certain distance after cost sharply increase; And Fiber White-light Interferometer trap wave point location technology postpones fibre optic ring owing to existing, and postpone fibre optic ring itself and also can produce trap wave point, in long Distance positioning process, easily causing trap wave point aliasing interference phenomenon, and solving by reducing delay fibre optic ring length the sensitivity that Aliasing Problem can reduce system.
Pipeline security protection can not be risen to a good application height by various technology all the time above, market still lacks a kind of effective pipeline security type technical products, in view of the above problems, a kind of oil/gas pipe line safety monitoring method that is simple, fiber orientation type that cost is low is developed imperative.
Model utility content
The purpose of this utility model overcomes on existing market still to lack a kind of effective pipeline security type technical products.Oil/gas pipe line safety monitoring system based on distributing optical fiber sensing of the present utility model, avoid the hardware unit of loaded down with trivial details costliness, also evaded the double-barreled question of white light interferometer location technology simultaneously, insertion loss is less, be applicable to long distance, on a large scale oil/gas pipe line safe early warning, monitoring distance can reach 150km, has a good application prospect.
In order to achieve the above object, the technological scheme that the utility model adopts is:
Based on an oil/gas pipe line safety monitoring system for distributing optical fiber sensing, it is characterized in that: comprise
Laser, first photodetector, second photodetector, 3rd photodetector, 3 × 3 Fiber Optic Coupler and the first sensor fibre terminal FRM and the second sensor fibre terminal FRM, described laser is connected with the first via input end of 3 × 3 Fiber Optic Coupler by optical fiber circulator with the second photodetector, described first photodetector, 3rd photodetector respectively with second of 3 × 3 Fiber Optic Coupler, three road input ends are connected, the first via output terminal of described 3 × 3 Fiber Optic Coupler is connected with the first sensor fibre terminal FRM by sensor fibre, second road output terminal of described 3 × 3 Fiber Optic Coupler is connected with the second sensor fibre terminal FRM by optical fiber reference arm.
The aforesaid oil/gas pipe line safety monitoring system based on distributing optical fiber sensing, is characterized in that: described sensor fibre distributes along the transmission direction of oil/gas pipe line.
The aforesaid oil/gas pipe line safety monitoring system based on distributing optical fiber sensing, is characterized in that: described first sensor fibre terminal FRM and the second sensor fibre terminal FRM is faraday rotator mirror.
The beneficial effects of the utility model are: the oil/gas pipe line safety monitoring system based on distributing optical fiber sensing of the present utility model, avoid the hardware unit of loaded down with trivial details costliness, also evaded the double-barreled question of white light interferometer location technology simultaneously, insertion loss is less, be applicable to long distance, on a large scale oil/gas pipe line safe early warning, monitoring distance can reach 150km, has a good application prospect.
Accompanying drawing explanation
Fig. 1 is the system block diagram of the oil/gas pipe line safety monitoring method based on distributing optical fiber sensing of the present utility model.
Fig. 2 is the flow chart of the oil/gas pipe line safety monitoring system based on distributing optical fiber sensing of the present utility model.
Embodiment
Below in conjunction with Figure of description, the utility model is described in further detail.Following examples only for clearly the technical solution of the utility model being described, and can not limit protection domain of the present utility model with this.
As shown in Figure 1, oil/gas pipe line safety monitoring system based on distributing optical fiber sensing of the present utility model, comprise laser, first photodetector (photodetector 1), second photodetector (photodetector 2), 3rd photodetector (photodetector 3), 3 × 3 Fiber Optic Coupler (coupler), first sensor fibre terminal FRM (FRM) and the second sensor fibre terminal FRM (the 2nd FRM), laser, second photodetector is connected with the first via input end of 3 × 3 Fiber Optic Coupler by optical fiber circulator M, first photodetector, 3rd photodetector respectively with second of 3 × 3 Fiber Optic Coupler, three road input ends are connected, the first via output terminal of 3 × 3 Fiber Optic Coupler is connected with the first sensor fibre terminal FRM by sensor fibre, second road output terminal of 3 × 3 Fiber Optic Coupler is connected with the second sensor fibre terminal FRM by optical fiber reference arm, wherein sensor fibre distributes along the transmission direction of oil/gas pipe line, first sensor fibre terminal FRM and the second sensor fibre terminal FRM is faraday rotator mirror.
Based on the monitoring method of the oil/gas pipe line safety monitoring system of above-mentioned distributing optical fiber sensing, avoid the hardware unit of loaded down with trivial details costliness, also evaded the double-barreled question of white light interferometer location technology simultaneously, insertion loss is less, be applicable to long distance, on a large scale oil/gas pipe line safe early warning, monitoring distance can reach 150km, as shown in Figure 2, specifically comprise the following steps
Step (1), builds Michelson fiber-optic interferometer by 3 × 3 Fiber Optic Coupler, obtains three road interference signals on oil/gas pipe line, there is the fixed skew of 2 π/3 between adjacent two-way interference signal;
Step (2), utilizes three road interference signals, demodulates interference light phase delta phi (t) that disturbance causes, and process is,
(1) set disturbance φ (t) as single frequency sinusoidal function, as shown in formula (1),
φ(t)＝φ
0sinω(t) (1)
Wherein, φ
0refer to the photophase change amplitude that disturbance causes; ω refers to forcing frequency;
(2) according to formula (2), interference light phase delta phi (t) that calculation perturbation causes,
Wherein, τ
0for the first via light of fibre optic interferometer is through L
0the time of distance, τ
1for the second road light of fibre optic interferometer is through L
1the time of distance, τ
2for the 3rd road light of fibre optic interferometer is through L
2the time of distance,
during for undisturbed situation, the phase difference of optical fiber reference arm and sensor fibre; L
0for the total length of the sensor fibre arranged in parallel with oil/gas pipe line; L1 is the distance of disturbance point to sensor fibre top; L2 is the distance of disturbance point to sensor fibre terminal FRM;
Step (3), carries out formula (2) and differs from eliminate indigestion computing, obtains formula (3),
Step (4), to formula (3) elimination phase DC composition, and to formula (3) differential differentiate, obtains formula (4),
Δφ′(t)＝2φ
0ωcosω(t+τ
0)cosω(τ
2) (4)；
Step (5), carries out Spectrum Conversion to formula (4), obtains formula (5),
Δφ′(ω)＝2φ
0ωcosω(τ
2) (5)；
Step (6), as cos ω (τ
2)=0, according to formula (5), obtains formula (6),
2πfn(L
2)/C＝kπ+π/2 (6)
Then,
Wherein, n is optical fibre refractivity, C is the light velocity, K is natural number, and periodic depression points will appear in spectrogram, and by determining the frequency values f of depression points, calculate L2, L2 is the disturbance location that the external world puts on oil/gas pipe line, facilitates detection failure.
Step (1), Michelson fiber-optic interferometer is built by 3 × 3 Fiber Optic Coupler, the method obtaining three road interference signals on oil/gas pipe line is, each road interference signal comprises two-beam road, two-beam road is formed interferes, the path of a branch of light path be laser to 3 × 3 Fiber Optic Coupler to optical fiber reference arm to the first sensor fibre terminal FRM to optical fiber reference arm to 3 × 3 Fiber Optic Coupler to photodetector;
Another bundle the light velocity path be, laser to 3 × 3 Fiber Optic Coupler to the second sensor fibre terminal FRM to 3 × 3 Fiber Optic Coupler to photodetector,
As shown in Figure 1, A road interference signal comprises a branch of light path is laser-3 × 3coupler (3 × 3 Fiber Optic Coupler)-optical fiber reference arm-the one FRM (faraday rotator mirror)-optical fiber reference arm-3 × 3coupler-photodetector 1; Another beam optical path is laser-3 × 3coupler-sensor fibre-the two FRM-sensor fibre-3 × 3coupler-photodetector 1;
It is laser-3 × 3coupler-optical fiber reference arm-the one FRM-optical fiber reference arm-3 × 3coupler-photodetector 2 that B road interference signal comprises a branch of light path; Laser-3 × 3coupler-sensor fibre-the two FRM-sensor fibre-3 × 3coupler-photodetector 2;
It is laser-3 × 3coupler-optical fiber reference arm-the one FRM-optical fiber reference arm-3 × 3coupler-photodetector 3 that C road interference signal comprises a branch of light path; Laser-3 × 3coupler-sensor fibre-the two FRM-sensor fibre-3 × 3coupler-photodetector 3.
, between adjacent two-way interference signal, there is the fixed skew of 2 π/3 in above-mentioned A, B, C tri-road interference signal.
More than show and describe basic principle of the present utility model, major character and advantage.The technician of the industry should understand; the utility model is not restricted to the described embodiments; what describe in above-described embodiment and specification just illustrates principle of the present utility model; under the prerequisite not departing from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (3)
1. based on the oil/gas pipe line safety monitoring system of distributing optical fiber sensing, it is characterized in that: comprise laser, first photodetector, second photodetector, 3rd photodetector, 3 × 3 Fiber Optic Coupler, first sensor fibre terminal FRM and the second sensor fibre terminal FRM, described laser is connected with the first via input end of 3 × 3 Fiber Optic Coupler by optical fiber circulator with the second photodetector, described first photodetector, 3rd photodetector respectively with second of 3 × 3 Fiber Optic Coupler, three road input ends are connected, the first via output terminal of described 3 × 3 Fiber Optic Coupler is connected with the first sensor fibre terminal FRM by sensor fibre, second road output terminal of described 3 × 3 Fiber Optic Coupler is connected with the second sensor fibre terminal FRM by optical fiber reference arm.
2. the oil/gas pipe line safety monitoring system based on distributing optical fiber sensing according to claim 1, is characterized in that: described sensor fibre distributes along the transmission direction of oil/gas pipe line.
3. the oil/gas pipe line safety monitoring system based on distributing optical fiber sensing according to claim 1, is characterized in that: described first sensor fibre terminal FRM and the second sensor fibre terminal FRM is faraday rotator mirror.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104197206A (en) * | 2014-09-18 | 2014-12-10 | 苏州光蓝信息技术有限公司 | Distributed fiber-optic sensing based oil-gas pipeline safety monitoring system and method |
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2014
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104197206A (en) * | 2014-09-18 | 2014-12-10 | 苏州光蓝信息技术有限公司 | Distributed fiber-optic sensing based oil-gas pipeline safety monitoring system and method |
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Effective date of registration: 20180516 Address after: 410000 Changsha 31 economic and Technological Development Zone, Changsha, Hunan 1, 31 industrial city, Chong Chuang 3 floor. Patentee after: Hunan light blue Technology Development Co., Ltd. Address before: 215411 Jiangsu province Suzhou city Taicang science and education new town Jian Xiong Road No. 20 10-201 Patentee before: SUZHOU GUANGLAN INFORMATION TECHNOLOGY CO., LTD. |
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