CN201539695U - Monitoring device for evaluating pipeline reinforcing effect - Google Patents
Monitoring device for evaluating pipeline reinforcing effect Download PDFInfo
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- CN201539695U CN201539695U CN2009202468487U CN200920246848U CN201539695U CN 201539695 U CN201539695 U CN 201539695U CN 2009202468487 U CN2009202468487 U CN 2009202468487U CN 200920246848 U CN200920246848 U CN 200920246848U CN 201539695 U CN201539695 U CN 201539695U
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- optical fiber
- optical
- probe
- portable
- demodulator
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- 238000012806 monitoring device Methods 0.000 title claims abstract description 8
- 230000003014 reinforcing effect Effects 0.000 title abstract description 4
- 239000013307 optical fiber Substances 0.000 claims abstract description 76
- 239000000523 sample Substances 0.000 claims abstract description 47
- 230000003287 optical effect Effects 0.000 claims abstract description 36
- 238000006073 displacement reaction Methods 0.000 claims abstract description 17
- 230000005540 biological transmission Effects 0.000 claims abstract description 13
- 238000007405 data analysis Methods 0.000 claims abstract description 6
- 239000000835 fiber Substances 0.000 claims description 27
- 238000007747 plating Methods 0.000 claims description 12
- 239000012528 membrane Substances 0.000 claims description 9
- 230000000694 effects Effects 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 7
- 239000012779 reinforcing material Substances 0.000 claims description 5
- 238000004458 analytical method Methods 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 8
- 238000005259 measurement Methods 0.000 abstract description 7
- 238000012544 monitoring process Methods 0.000 description 9
- 230000002787 reinforcement Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 239000002360 explosive Substances 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000002277 temperature effect Effects 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000005314 correlation function Methods 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000005305 interferometry Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000001953 sensory effect Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 230000009885 systemic effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000002463 transducing effect Effects 0.000 description 1
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- Length Measuring Devices By Optical Means (AREA)
Abstract
The utility model relates to a monitoring device for evaluating the pipeline reinforcing effect, two optical fiber probes of an optical fiber sensor are connected with a portable demodulator through a 3dB optical coupler A; the fixed-length optical fiber and the length-adjustable optical fiber of the portable demodulator are connected with a 3dB optical coupler B; the length-adjustable optical fiber is connected with the micro-displacement regulator, and the 3dB optical coupler B is connected with the light receiving interface and the photoelectric detector; the LED is connected with the optical transmission interface; the photoelectric detector, the preamplifier, the filter, the A/D converter and the internal data processor are connected in sequence; the internal data processor is respectively connected with the data analysis and acquisition system and the micro-displacement regulator; the device has the advantages of strong anti-interference capability, low requirements on a light source and demodulation, simple structure, low cost and strong practicability; the method can realize the long-time maintenance-free continuous measurement of a single point and can also realize the continuous measurement of multiple points simultaneously.
Description
Technical field
The utility model relates to natural gas line corrosion monitoring technical field and technical field of optical fiber sensing, is a kind of employing low coherence interference fiber optic sensor technology, realizes estimating the monitoring device of pipeline strength rehabilitation effect by the monitoring pipeline strain.
Background technique
For the traditional electro-detection method of pipeline is that sticking strain gauge is measured strain outside the reinforcement position of pipeline.The principle of foundation is that foil gauge is formed the variation that bridge architecture is responded to the tested body strain, and converts the electric weight that needs to, detects with the dR=ad ε (a is a rate of strain) that concerns that asks of the resistance variations dR that utilizes strain variation d ε and foil gauge.This method of measurement is based on strain-electric weight, is the carrier of conversion and transmission with the electrical signal, use the lead transmission of electric signals, thereby be subjected to environmental limit during use, may cause short circuit as ambient humidity is too big, particularly in high temperature and inflammable, explosive environments, cause accident easily.
In recent years the optical fiber sensing technology of Xing Qiing has that anti-electromagnetic interference capability is strong, highly sensitive, electrical insulating property is good, safe and reliable, corrosion-resistant, can constitute plurality of advantages such as optical fiber sensor network, all have broad application prospects in fields such as industry, agricultural, biologic medicals, especially in high temperature, inflammable and explosive environment, use to have innate advantage.Present hot spot technology is fiber-optic grating sensor and distributed sensor, and the latter is to serve as typical case representative with the optical fiber transducer based on brillouin effect.Fiber-optic grating sensor is typical quasi-distributed sensor, can only monitor the strain of discontinuous some spots by a plurality of gratings of series connection, and be the monitoring that realizes the pipeline strength rehabilitation effect, need realize monitoring to the strain at whole reinforcement position, so this technology is not suitable for the evaluation of reinforcing effect.Distributed sensor is fit to the continuous monitoring of long distance, for example can realize the leakage monitoring of tens kilometers left and right sides pipelines based on the distributed sensor of Brillouin scattering.But distributed sensor demodulation techniques complexity is of a high price, is not suitable for the monitoring of reinforcing effect.
The model utility content
The purpose of this utility model is: design a kind of spatial resolution height, cost low, be applicable to high temperature, inflammable and explosive environments, can carry out the long-time optical fiber transducer monitoring device of measuring in real time, be used for long-time, the non-maintaining monitoring of pipeline strength rehabilitation section.
The monitoring device of evaluation pipeline strength rehabilitation effect described in the utility model, by optical fiber transducer, portable (FBG) demodulator and data analysis acquisition system constitute;
Optical fiber transducer is made up of measuring optical fiber probe and two fiber optic probes of reference optical fiber probe, and fiber optic probe adopts the general communication Single Mode Fiber, and the fiber optic probe structure becomes the coiling shape, and the size of probe is adjustable between ￠ 25-￠ 200mm; Be embedded in reinforcing material inside or adhere on pipeline external surface, the end of fiber optic probe is coated with high-reflecting film, constitutes metallic-membrane plating reflector; The measuring optical fiber probe is connected with receiving interface of optical with the light transmission interface of portable (FBG) demodulator by 3dB optical coupler A with the reference optical fiber probe;
Portable (FBG) demodulator is made of reference interferometer, light source and detection demodulation circuit; Reference interferometer is a Michelson's interferometer, is connected 3dB optical coupler B by two fiber optic interferometric arms of fixed length optical fiber and length-adjustable optical fiber and constitutes; The end plating high-reflecting film of fixed length optical fiber form metallic-membrane plating reflector, and length-adjustable optical fiber is connected with a piezoelectric constant PZT micrometric displacement regulator, and 3dB optical coupler B is connected with photoelectric detector with receiving interface of optical respectively; The LED light emitting diode is connected with the light transmission interface, and operation wavelength is 1.31 μ m, adopts the continuous light source modulation; Detecting demodulation circuit is connected and composed successively by photoelectric detector, preamplifier, wave filter, A/D converter and internal data processor; Internal data processor difference linking number is acquisition system and piezoelectric constant PZT micrometric displacement regulator according to one's analysis.
Two probes of optical fiber transducer are through after encapsulating, and the measuring optical fiber probe is fixed on the reinforcement position, and reinforcing material can be converted to the elongation and the contraction of probe optical fiber with the change in displacement of pressure, rigidity in the tube wall.Reference optical fiber probe is fixed on the pipeline and is 90 ° position with the reinforcement position, it is popped one's head in measuring optical fiber be under the same temperature.Because optical fiber transducer is only monitored the length difference of two optical fiber, have only mechanical deformation influential to the result, and other interference, for example temperature and pressure changes the variation of the optical fibre refractivity that causes, influence to two optical fiber is the same, so can balance out, the optical path difference of two fiber optic probes is linear change with the shift value δ of measuring optical fiber probe, so the reference optical fiber probe can be realized the compensation to temperature effect.
The low-coherent light that the light source led light emitting diode sends is after three-dB coupler A beam splitting, enter two fiber optic probes of optical fiber transducer, after the reflector emission of fiber optic probe end, through three-dB coupler A mix the back by Optical Fiber Transmission to portable (FBG) demodulator, interfere arm for two that are delivered to reference interferometer respectively, in three-dB coupler B, mix after being reflected, form interference signal, and detect reception by photoelectric detector.The detection demodulation circuit that photoelectric detector, preamplifier, wave filter, A/D converter and internal data processor are formed can be realized the detection of interference fringe envelope.Under the feedback control of internal data processor, piezoelectric constant PZT micrometric displacement regulator can change the light path of length-adjustable optical fiber, the optical path difference of tracking illumination fiber sensor changes, when two of reference interferometers interfere the optical path difference of arm to equal the optical path difference of two probes of optical fiber transducer, detect demodulation circuit and can detect interference peaks, thereby realize absolute measurement fiber optic probe shift value δ.Portable (FBG) demodulator will record data δ and deliver to the data analysis acquisition system by serial ports.
The data analysis acquisition system is a portable computer.For pressure, geometrical construction and sensor test value in structure of interest parameter (as pipe thickness) and the tube wall are linked together, DAS is integrated one group of formula.
Pipe thickness is provided by following formula:
H=0.535LpR/E δ (pool river in Jiangsu Province which flows into the Huangpu River of Shanghai ratio is 0.3) (1)
Wherein L is the sensor measuring length, and p is a force value, and R is the pipeline radius, and δ is the sensor shift value, and E is a Young's modulus.
The allround die holder of the attenuation situation of prediction pipeline is shown below:
h(t)/h
r＝1/[1+Ct] (2)
Wherein t is the time, h
rBe the pipe thickness reference value, C is a corrosion rate, is provided by following formula:
C＝[(δ
t/δ
r)-1]/Δt (3)
δ wherein
rBe sensor shift value reference value.
The low coherence interferometry principle:
Producing low coherence interference needs two interferometers (reference interferometer and sensing interferometer), and sensing interferometer is converted to the variation of measurand the variation of optical path difference; The reference interferometer mutual incoherent optical signal of self-sensing interferometer in the future overlaps and produces interference.Like this, output terminal just can be observed the interference fringe of output signal: output intensity has maximum value when the optical path difference of two interference fringes equates, corresponding fringe contrast is also maximum, is called the center striped.Be to satisfy the acquisition of low degree of coherence light source and the detection two large problems of zero order interference fringe, require the coherent length of used light source both should satisfy optical path difference, again greater than the difference of two interferometer optical path differences much smaller than two interferometers.In the systematic survey process, by changing the micrometric displacement instrument, make the light path difference and the method that the light path difference of sensing interferometer equates of reference interferometer, directly obtain the changing value of sensing interferometer optical path difference, thereby realize measured absolute measurement.
Optical fiber transducer of the present utility model constitutes sensing interferometer, and Michelson's interferometer is integrated in the portable (FBG) demodulator and constitutes reference interferometer, and piezoelectric constant PZT micrometric displacement regulator constitutes the micrometric displacement instrument.In optical fiber transducer, the strain of reinforcing material is converted into the fiber lengths displacement of measuring optical fiber probe, and the reference optical fiber probe is realized temperature correction.The optical path difference of measuring optical fiber probe and reference optical fiber probe is Δ L
1, it is Δ L that reference interferometer two is interfered the optical path difference of arm
2, the interference light light intensity that photoelectric detector detects is:
I＝I
1+I
2+2(I
1I
2)
1/2υ
11(ΔΦ)cos(ΔΦ) (4)
ΔΦ＝2πΔLn
g/λ
0 (5)
n
g＝n
eff+υ(dn
eff/dυ) (6)
ΔL＝|ΔL
1±ΔL
2| (7)
n
EffBe the effective refractive index of optical fiber, n
gBe that group index (compares n in silicon
EffHigh about 1%) λ,
0Be light centre wavelength in a vacuum, υ
11For considering the self correlation function of spectral emissions characteristic, Δ L is two and interferes path difference.
When the optical path difference of reference interferometer two arms equaled the path difference of sensing interferometer, interference fringe occurred.Change Δ L
2, will be by Δ L
1=Δ L
2Perhaps Δ L
1=-Δ L
2Obtain Δ L=0, therefore have two interference fringes.As Δ L
2Also can produce interference at=0 o'clock, this interference fringe can be used as reference.These three interference fringes can be by lock-in amplifier and the synchronous method acquisition of micro positioner.The reading of micro positioner when producing by reading interference peaks can record the absolute displacement δ of fiber optic probe 1.Because reference signal is discrete generation, there is not constant phase relationship with transducing signal, so have only the envelope of restituted signal that physical significance is arranged, optical fiber property is degenerated and only can be influenced the resolution of interference fringe and can not influence its position.
The utility model is compared with other prior art based on optical fiber low coherence interference sensory technique, has following tangible advantage and characteristics:
1, anti-electromagnetic interference, anticorrosive, can be in highfield and other rugged environments proper functioning, the response time short (Millisecond).Electrical insulation completely, the impact that can resist high voltage and high electric current.
2, optical fiber both can be used as sensing usefulness, also can communicate transmission to signal, so loss is low, and the reliability height is suitable for long Distance Transmission.
3, sensing head is simple in structure, volume is little, in light weight, shape variable, is convenient to encapsulation, good stability, good reproducibility.The size at the coiling structure energy self adaption reinforcement position of particular design is monitored the strain at whole reinforcement position.
4, adopt the reference optical fiber probe, effectively the compensation temperature effect reduces external disturbance, increases system works stability.
5, optical fiber low coherence interference system antijamming capability is strong, the factors such as disturbance of systemic resolution and optical source wavelength stability, light source power fluctuation, optical fiber are irrelevant, can measure the absolute displacement of sensing probe, measuring accuracy is only by definite precision of interference fringe central position and definite precision decision of reference mirror.Therefore has advantage simple in structure, with low cost, practical.
6, can realize the long-time non-maintaining continuous measurement of single-point, also can realize simultaneously multiple spot being carried out continuous measurement.
Description of drawings
Fig. 1 pipeline strength rehabilitation effect monitoring apparatus structure schematic representation.
Fig. 2 optical fiber transducer fiber optic probe schematic representation.
The mounting point schematic representation (outer surface figure) of Fig. 3 optical fiber transducer on body.
The mounting point schematic representation (cross-sectional view) of Fig. 4 optical fiber transducer on body.
Among the figure, 1. measuring optical fiber is popped one's head in, 2. the reference optical fiber probe, 3.3dB optical coupler A, 4. light emitting diode (LED), 5. photoelectric detector (PD), 6. preamplifier, 7. wavenumber filter, 8.A/D transducer, 9. length-adjustable optical fiber, 10. fixed length optical fiber, 11. the micrometric displacement regulator, 12.3dB optical coupler B, 13. internal data processors, 14. metallic-membrane plating reflector, 15. metallic-membrane plating reflector, 16. metallic-membrane plating reflectors, 17. optical fiber transducers, 18. portable (FBG) demodulator, 19. portable computer, 20. smooth transmission interfaces, 21. receiving interface of optical.
Embodiment
The monitoring device of evaluation pipeline strength rehabilitation effect described in the utility model, by optical fiber transducer 17, portable (FBG) demodulator 18 and data analysis acquisition system 19 constitute;
Portable (FBG) demodulator 18 is made of reference interferometer, light source and detection demodulation circuit; Reference interferometer is a Michelson's interferometer, is connected 3dB optical coupler B12 by 9 two fiber optic interferometric arms of fixed length optical fiber 10 and length-adjustable optical fiber and constitutes; The end plating high-reflecting film of fixed length optical fiber 10 form metallic-membrane plating reflector 16, and length-adjustable optical fiber 9 is connected with a piezoelectric constant PZT micrometric displacement regulator 11, and 3dB optical coupler B12 is connected with photoelectric detector (PD) 5 with receiving interface of optical 21 respectively; LED light emitting diode 4 is connected with the light transmission interface, and operation wavelength is 1.31 μ m, adopts continuous light source modulation (CW); Detecting demodulation circuit is connected and composed successively by photoelectric detector (PD) 5, preamplifier 6, wave filter 7, A/D converter 8 and internal data processor 13; Internal data processor 13 difference linking numbers are acquisition system 19 and piezoelectric constant (PZT) micrometric displacement regulator 11 according to one's analysis.
Claims (1)
1. monitoring device of estimating the pipeline strength rehabilitation effect, by optical fiber transducer, portable (FBG) demodulator and data analysis acquisition system constitute; It is characterized in that:
Optical fiber transducer is made up of measuring optical fiber probe and two fiber optic probes of reference optical fiber probe, and fiber optic probe adopts the general communication Single Mode Fiber, and the fiber optic probe structure becomes the coiling shape, and the size of probe is adjustable between ￠ 25-￠ 200mm; Be embedded in reinforcing material inside or adhere on pipeline external surface, the end of fiber optic probe is coated with high-reflecting film, constitutes metallic-membrane plating reflector; The measuring optical fiber probe is connected with receiving interface of optical with the light transmission interface of portable (FBG) demodulator by 3dB optical coupler A with the reference optical fiber probe;
Portable (FBG) demodulator is made of reference interferometer, light source and detection demodulation circuit; Reference interferometer is a Michelson's interferometer, is connected 3dB optical coupler B by two fiber optic interferometric arms of fixed length optical fiber and length-adjustable optical fiber and constitutes; The end plating high-reflecting film of fixed length optical fiber form metallic-membrane plating reflector, and length-adjustable optical fiber is connected with a piezoelectric constant PZT micrometric displacement regulator, and 3dB optical coupler B is connected with photoelectric detector with receiving interface of optical respectively; The LED light emitting diode is connected with the light transmission interface, and operation wavelength is 1.31 μ m, adopts the continuous light source modulation; Detecting demodulation circuit is connected and composed successively by photoelectric detector, preamplifier, wave filter, A/D converter and internal data processor; Internal data processor difference linking number is acquisition system and piezoelectric constant PZT micrometric displacement regulator according to one's analysis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202468487U CN201539695U (en) | 2009-11-11 | 2009-11-11 | Monitoring device for evaluating pipeline reinforcing effect |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202468487U CN201539695U (en) | 2009-11-11 | 2009-11-11 | Monitoring device for evaluating pipeline reinforcing effect |
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| Publication Number | Publication Date |
|---|---|
| CN201539695U true CN201539695U (en) | 2010-08-04 |
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ID=42591147
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|---|---|---|---|
| CN2009202468487U Expired - Lifetime CN201539695U (en) | 2009-11-11 | 2009-11-11 | Monitoring device for evaluating pipeline reinforcing effect |
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|---|---|
| CN (1) | CN201539695U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105180815A (en) * | 2014-06-19 | 2015-12-23 | 纳米及先进材料研发院有限公司 | self-referencing intensity-based polymer optical fiber displacement sensor |
| CN108759936A (en) * | 2018-08-23 | 2018-11-06 | 中铁第四勘察设计院集团有限公司 | Drainage pipeline monitoring compensation system based on OFDR distribution type fiber-optics and method |
-
2009
- 2009-11-11 CN CN2009202468487U patent/CN201539695U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105180815A (en) * | 2014-06-19 | 2015-12-23 | 纳米及先进材料研发院有限公司 | self-referencing intensity-based polymer optical fiber displacement sensor |
| CN105180815B (en) * | 2014-06-19 | 2018-04-13 | 纳米及先进材料研发院有限公司 | The polymer optical fiber displacement sensor based on intensity of self-reference |
| CN108759936A (en) * | 2018-08-23 | 2018-11-06 | 中铁第四勘察设计院集团有限公司 | Drainage pipeline monitoring compensation system based on OFDR distribution type fiber-optics and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100804 |