CN110331974A - A kind of novel oilfield well logging optical cable based on weak optical fiber Bragg grating array - Google Patents
A kind of novel oilfield well logging optical cable based on weak optical fiber Bragg grating array Download PDFInfo
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- CN110331974A CN110331974A CN201910538388.3A CN201910538388A CN110331974A CN 110331974 A CN110331974 A CN 110331974A CN 201910538388 A CN201910538388 A CN 201910538388A CN 110331974 A CN110331974 A CN 110331974A
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- optical fiber
- bragg grating
- coated wire
- fiber bragg
- grating array
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 74
- 230000003287 optical effect Effects 0.000 title claims abstract description 40
- 239000000835 fiber Substances 0.000 claims abstract description 38
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 36
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 36
- 239000011701 zinc Substances 0.000 claims abstract description 36
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 27
- 239000010959 steel Substances 0.000 claims abstract description 27
- 238000005259 measurement Methods 0.000 claims abstract description 14
- 239000010410 layer Substances 0.000 claims description 34
- 239000011162 core material Substances 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000004804 winding Methods 0.000 claims description 4
- 239000004642 Polyimide Substances 0.000 claims description 3
- 239000011247 coating layer Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 229920001721 polyimide Polymers 0.000 claims description 3
- 239000010453 quartz Substances 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 238000009529 body temperature measurement Methods 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000010276 construction Methods 0.000 abstract description 3
- 239000003129 oil well Substances 0.000 description 10
- 238000000034 method Methods 0.000 description 5
- 238000012544 monitoring process Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000004698 Polyethylene Substances 0.000 description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 229910052755 nonmetal Inorganic materials 0.000 description 3
- -1 polyethylene Polymers 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- 230000002787 reinforcement Effects 0.000 description 3
- 238000001069 Raman spectroscopy Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 229910001335 Galvanized steel Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000013475 authorization Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
- E21B47/07—Temperature
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
- E21B47/13—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling by electromagnetic energy, e.g. radio frequency
- E21B47/135—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling by electromagnetic energy, e.g. radio frequency using light waves, e.g. infrared or ultraviolet waves
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
Abstract
The novel oilfield that the invention discloses a kind of based on weak optical fiber Bragg grating array is logged well optical cable, including temperature sensing optical fiber, vibrating sensing optical fiber, seamless steel pipe, first layer zinc-coated wire and second layer zinc-coated wire.Accurate distributed temperature measurements is realized using the weak optical fiber Bragg grating array that ultra-narrow bandwidth is arranged on temperature-measuring optical fiber, it is realized using the weak optical fiber Bragg grating array that broadband is arranged on vibration optical fiber and carries out distributed vibration measurement under Larger Dynamic temperature range, and can be accurately positioned.By the way that sensor fibre to be set in seamless steel pipe, and outside seamless steel pipe, successively the first layer zinc-coated wire of package high temperature corrosion-resisting and second layer zinc-coated wire form armored optical cable in the opposite direction.The present invention has many advantages, such as that strong signal, accurate positioning, measurement accuracy are high, while stretching resistance is strong, degree of safety is high, and corrosion-and high-temp-resistant is strong, convenient for manufacture and construction.
Description
Technical field
The present invention relates to distributing optical fiber sensing field more particularly to a kind of distributed sensing optical cables of oil reservoir logging.
Background technique
With the development of optical fiber technology, distributing optical fiber sensing has been gradually applied to oil well monitor field, distribution type fiber-optic
Sensing technology has the characteristics that stability, long-term effect and real-time, and part becomes preferred instead of conditional electronic monitoring technology
Oil well monitor method.Sensing and transmission medium of the optical cable as optical signal, have become the group of core in optical fiber logging system
At part.The optical fiber of production optical cable is mostly single mode optical fiber at present, external using Brillouin scattering, Raman scattering and Rayleigh scattering
Temperature, pressure and the vibration on boundary are perceived and are measured, but it is 10 that these scattered signals are very weak-6—10-8Magnitude, therefore be
The signal-to-noise ratio of system is very low, causes distance sensing and spatial resolution very low, and the optical cable made is only laid particular emphasis on to internal optical fiber
Protection, can not make optical fiber in optical cable in oil well temperature and vibration perceive, also can not just be completed at the same time in oil well
The distributed monitoring of temperature and vibration.
The temperature and vibration monitoring of optical fiber distributed type oil well had both needed high spatial resolution and on a large scale measurement, had also wanted
The structure of optical cable is reasonably designed, oil well high temperature high pressure, chemical attack and the more serious environment of galvano-cautery are met.It is existing
Some well logging optical cables have the following disadvantages in actual application and defect:
1. sensing optic cable generally uses common single mode optical fiber, the very weak signal-to-noise ratio for leading to system of scattered signal is very low, because
This largely limits the distance and spatial resolution of sensing, and the temperature and stress measured is being averaged for a distance
Value, the error of positioning are larger.
2. the design of optical cable do not combine under oil well adverse circumstances be used for a long time and measure simultaneously temperature and
The demand of stress or solves the problems, such as durability, cabling process causes temperature and stress measurement error larger or promoted
The reliability of temperature and stress test, but it is not able to satisfy the requirement of long-time service.
Chinese patent Authorization Notice No. is that the patent of invention of CN102707394A discloses a kind of detecting optical cable of oil field, is used
The structure of one cable, two core a, wherein core, as pressure conduction element, a core detects strain and temperature as temperature conduction element
The variation of degree, it includes tightly packaged fiber measurement pressure, and bare fibre measures temperature, and six roots of sensation non-metal reinforcement member wraps up tightly packaged fiber,
Pressure conduction ointment is full of non-metal reinforcement member, and the oil filled bushing that blocks water wraps up bare fibre and is used to thermometric, and finally all structures are used poly-
The package protection of ethylene oversheath.
Firstly, the well logging optical cable is non-metal reinforcement member package optical fiber, it is not able to satisfy during deep-well test
The requirement of stretching resistance, and outermost layer is that internal structure is protected using polyethylene outer sheath, and oil is not able to satisfy in oil well
The complex environment of well high temperature high pressure, the temperature of deep-well is up to 300 DEG C, and the fusing point of polyethylene is at 100 DEG C, therefore not applicable
In the test of deep-well, and polyethylene cannula is easily corroded in oil well.
Secondly, the well logging optical cable is sensed with bare fibre, it is utilized respectively the Raman scattering and Brillouin scattering of optical fiber
Test temperature and pressure, since scattering coefficient is very low, scattering strength is often the 10 of incident intensity-6~10-8Magnitude, noise
Than it is low cause detection sensitivity it is lower, and the temperature and pressure value measured be by carrying out average computation after arda sampling,
The error of positioning is very big.
Summary of the invention
The technical problem to be solved in the present invention is that big for position error in the prior art, sensitivity is low, corrosion-resistant, resistance to
The defect of high temperature difference provides a kind of novel oilfield well logging optical cable based on dim light grid array, high suitable for petroleum industry exploitation
The temperature of deep-well, micro seismic monitoring under warm hyperbaric environment.
The technical solution adopted by the present invention to solve the technical problems is:
A kind of novel oilfield well logging optical cable based on weak optical fiber Bragg grating array, including seamless steel pipe are provided, and are set to
Temperature sensing optical fiber and vibrating sensing optical fiber in the seamless steel pipe；
The seamless steel pipe is externally wrapped with package first layer zinc-coated wire, and the first layer zinc-coated wire is externally wrapped with package
The winding package of second layer zinc-coated wire, two layers of zinc-coated wire is contrary；Also filled with greasy for preventing water in the seamless steel pipe；
Narrow band fiber bragg grating array is provided on the temperature sensing optical fiber, the narrow band fiber bragg grating array multiplexing is multiple
Dim light grid, the vibrating sensing optical fiber are provided with broadband fiber gratings array, and the broadband fiber gratings array multiplexing is multiple weak
Grating, multiple dim light grid of the narrow band fiber bragg grating array multiplexing and multiple dim lights of broadband fiber gratings array multiplexing
The parameter of grid is different.
Above-mentioned technical proposal is connect, the first layer zinc-coated wire and the second layer zinc-coated wire are corrosion-and high-temp-resistant
The diameter of zinc-coated wire, the second layer zinc-coated wire is greater than the first layer zinc-coated wire diameter.
Connect above-mentioned technical proposal, the three dB bandwidth of the narrow band fiber bragg grating array is less than 0.2nm, central wavelength between
1530nm~1560nm, the dim light grid quantity of multiplexing are more than 3000, grating space between 1m~50m, optical grating reflection rate between
0.01%~1%, it is used for distributed temperature measurements.
Above-mentioned technical proposal is connect, the three dB bandwidth of the broadband fiber gratings array is greater than 3nm, central wavelength 1550nm,
The dim light grid quantity of multiplexing is more than 600, grating space 5m, and optical grating reflection rate is between 0.01%~1%, for distributed vibration
Measurement.
Connecing above-mentioned technical proposal, the core material of the temperature sensing optical fiber and the vibrating sensing optical fiber is pure quartz,
Coating layer material is polyimides.
Above-mentioned technical proposal is connect, the temperature sensing optical fiber and the vibrating sensing optical fiber are juxtaposed on the seamless steel
Guan Zhong.
The beneficial effect comprise that: a kind of novel oilfield survey based on weak optical fiber Bragg grating array provided by the invention
Well optical cable realizes accurate distributed temperature measurements using the weak optical fiber Bragg grating array that ultra-narrow bandwidth is arranged on temperature-measuring optical fiber,
Realize that distributed vibration is carried out under Larger Dynamic temperature range surveys using the weak optical fiber Bragg grating array that broadband is arranged on vibration optical fiber
Amount, and can be accurately positioned.By the way that sensor fibre is set in seamless steel pipe, and outside seamless steel pipe in the opposite direction successively
The first layer zinc-coated wire and second layer zinc-coated wire that wrap up high temperature corrosion-resisting increase the tensile strength of optical cable.The present invention has letter
The advantages that number strong, accurate positioning, high measurement accuracy, while stretching resistance is strong, degree of safety is high, and corrosion-and high-temp-resistant is strong, just
In manufacture and construction.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing:
Fig. 1 is the sensing optic cable structural schematic diagram of the embodiment of the present invention；
Fig. 2 is the sensor fibre grating array structural schematic diagram of the embodiment of the present invention；
Fig. 3 is the temperature-measuring optical fiber grating bandwidth schematic diagram of the embodiment of the present invention；
Fig. 4 is that fiber grating bandwidth structural schematic diagram is moved in the vibration measuring of the embodiment of the present invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, not
For limiting the present invention.
The optical cable as shown in Figure 1, a kind of novel oilfield based on weak optical fiber Bragg grating array of the invention is logged well, including temperature pass
Photosensitive fine 1, vibrating sensing optical fiber 2, seamless steel pipe 3, first layer zinc-coated wire 5 and second layer zinc-coated wire 6, temperature sensing optical fiber
1 and vibrating sensing optical fiber 2 setting with seamless steel pipe 3 inside, seamless steel pipe 3 be externally wrapped with package first layer zinc-coated wire 5, first
Layer zinc-coated wire 5, which is externally wrapped with, wraps up second layer zinc-coated wire 6, also prevents in oil well filled with greasy for preventing water 4 in seamless steel pipe 3
Water and oil enter in seamless steel pipe 3, and optical fiber optical grating array can be made preferably to couple with external environment.
Sensing unit of the invention is the weak optical fiber Bragg grating array of two kinds of parameters, as shown in Fig. 2, the dim light grid of different parameters
81 are carved into an optical fiber 8 according to certain spacing, are multiplexed multiple dim light grid 81 and constitute dim light grid array.Temperature sensing
Optical fiber 1 is provided with narrow band fiber bragg grating array, and narrow band fiber bragg grating array is multiplexed multiple dim light grid 81, and vibrating sensing optical fiber 2 is set
It is equipped with broadband fiber gratings array, broadband fiber gratings array is multiplexed multiple dim light grid 81, the multiplexing of narrow band fiber bragg grating array
Dim light grid 81 are different from 81 parameter of dim light grid that broadband fiber gratings array is multiplexed.Skill is sensed by distributed weak optical fiber Bragg grating
Art realizes large-scale sensing unit networking, wherein the weak optical fiber Bragg grating array using ultra-narrow bandwidth passes through Wavelength demodulation method
Accurate distributed temperature measurements is carried out, using the weak optical fiber Bragg grating array in broadband by interference phase demodulation method in Larger Dynamic temperature
It spends under range and carries out distributed vibration measurement, and can accurately position.
5 diameter of first layer zinc-coated wire is less than 6 diameters of second layer galvanized steel, and is all high temperature corrosion-resisting zinc-coated wire,
The direction of the winding package seamless steel pipe 3 of first layer zinc-coated wire 5 and the winding package first layer zinc-coated wire of second layer zinc-coated wire 6
5 it is contrary, increase tensile capacity.By the way that sensor fibre 8 to be set in seamless steel pipe 3, and pressed outside seamless steel pipe 3
Opposite direction successively winds the first layer zinc-coated wire 5 of package high temperature corrosion-resisting and second layer zinc-coated wire 6 is formed for logging well
Armored optical cable has many advantages, such as that stretching resistance is strong, degree of safety is high, and corrosion-and high-temp-resistant is strong, at the same convenient for manufacture with
Construction.
As a kind of specific embodiment, 1 grating array of temperature sensing optical fiber and 2 grating array of vibrating sensing optical fiber are set to
Diameter is 3mm, and wall thickness is in the seamless steel pipe 3 of 0.8mm, and greasy for preventing water 4 fills full entire seamless steel pipe 3, seamless steel pipe outside
Wound clockwise wraps up the zinc-plated reinforcement steel wire of diameter 2.4mm first layer, and looping wraps the zinc-plated reinforcement steel wire of first layer counterclockwise outside
Diameter is the zinc-plated reinforcement steel wire of the second layer of 2.8mm.
Further, as shown in figure 3, the three dB bandwidth of the narrow band fiber bragg grating array is less than 0.2nm, central wavelength is situated between
In 1530nm~1560nm, 81 quantity of dim light grid of multiplexing is more than 3000, and grating space is between 1m~50m, optical grating reflection rate
Between 0.01%~1%, it to be used for distributed temperature measurements.When ambient temperature changes, the central wavelength of grating can float
It moves, the variation of ambient temperature is calculated by the variation of central wavelength, since bandwidth is narrow, the precision of measurement is very high.Make
For a kind of specific embodiment, the three dB bandwidth of narrow band fiber bragg grating array is 0.2nm, central wavelength 1549.8nm, grating it is anti-
Penetrating rate is 0.01%, is multiplexed quantity 3000, spacing 1m, measurement distance is 3km, and thermometric error is less than 1 DEG C.
Further, as shown in figure 4, the three dB bandwidth of the broadband fiber gratings array is greater than 3nm, central wavelength is
1550nm, multiple dim light grid quantity of the multiplexing are more than 600, grating space 5m, optical grating reflection rate between 0.01%~
1%, for distributed vibration measurement.The reflected light of adjacent gratings is interfered by non-equilibrium Michelson fiber-optic interferometer, when
Interference signal can change when there is vibration in the external world, and the variation by detecting interference signal restores vibration signal.As a kind of tool
Body embodiment, the three dB bandwidth with optical fiber optical grating array are 3.2nm, and the reflectivity of central wavelength 1550nm, grating are
0.01%, multiplexing quantity is 600, grating space 5m, and measurement distance is 3km.
Further, the core material of temperature sensing optical fiber 1 and vibrating sensing optical fiber 2 is pure quartz, and coating layer material is
Polyimides, as a kind of specific embodiment, sensor fibre diameter is 250um.
Further, temperature sensing optical fiber 1 and vibrating sensing optical fiber 2 are set side by side with seamless steel pipe 3, while measuring well
In temperature and vibration signal.
Oil reservoir logging optical cable of the invention uses the structure of two core of a cable, and weak optical fiber Bragg grating array is using optical fiber as load
Body, for fiber grating as sensor, a core is used to testing temperature, and another core is dynamic for vibration measuring.It is compared with traditional optical fiber cable, it is weak
Fiber grating has many advantages, such as that strong signal, accurate positioning, measurement accuracy are high；Furthermore the novel oilfield well logging based on dim light grid array
Optical cable can measure temperature and vibration signal in well simultaneously, and wherein the optical fiber optical grating array temperature measurement of ultra-narrow band is more accurate,
The optical fiber optical grating array in broadband is able to satisfy the vibration monitoring between well under Larger Dynamic temperature range, therefore in earthquake, oil exploration etc.
Field has huge application value.
It should be understood that for those of ordinary skills, it can be modified or changed according to the above description,
And all these modifications and variations should all belong to the protection domain of appended claims of the present invention.
Claims (6)
- The optical cable 1. a kind of novel oilfield based on weak optical fiber Bragg grating array is logged well, which is characterized in that including seamless steel pipe, Yi Jishe The temperature sensing optical fiber and vibrating sensing optical fiber being placed in the seamless steel pipe；The seamless steel pipe is externally wrapped with package first layer zinc-coated wire, and the first layer zinc-coated wire is externally wrapped with package second The winding package of layer zinc-coated wire, two layers of zinc-coated wire is contrary；Also filled with greasy for preventing water in the seamless steel pipe；Narrow band fiber bragg grating array is provided on the temperature sensing optical fiber, the narrow band fiber bragg grating array is multiplexed multiple dim lights Grid, the vibrating sensing optical fiber are provided with broadband fiber gratings array, and the broadband fiber gratings array is multiplexed multiple dim light grid, Multiple dim light grid of multiple dim light grid and broadband fiber gratings array multiplexing of the narrow band fiber bragg grating array multiplexing Parameter is different.
- The optical cable 2. novel oilfield according to claim 1 based on weak optical fiber Bragg grating array is logged well, which is characterized in that described First layer zinc-coated wire and the second layer zinc-coated wire are corrosion-and high-temp-resistant zinc-coated wire, the second layer zinc-coated wire Diameter be greater than the first layer zinc-coated wire diameter.
- The optical cable 3. novel oilfield according to claim 1 based on weak optical fiber Bragg grating array is logged well, which is characterized in that described 3 dB bandwidth of narrow band fiber bragg grating array are less than 0.2 nm, and central wavelength is between 1530 nm ~ 1560nm, the dim light grid of multiplexing Quantity is more than 3000, and grating space is surveyed between 0.01% ~ 1% for distributed temperature between the m of 1 m ~ 50, optical grating reflection rate Amount.
- The optical cable 4. novel oilfield according to claim 1 based on weak optical fiber Bragg grating array is logged well, which is characterized in that described 3 dB bands of broadband fiber gratings array are wider than 3nm, and central wavelength is 1550 nm, and the dim light grid quantity of multiplexing is more than 600 A, 5 m of grating space, optical grating reflection rate is between 0.01% ~ 1%, for distributed vibration measurement.
- The optical cable 5. novel oilfield according to claim 1 based on weak optical fiber Bragg grating array is logged well, which is characterized in that described The core material of temperature sensing optical fiber and the vibrating sensing optical fiber is pure quartz, and coating layer material is polyimides.
- The optical cable 6. novel oilfield according to claim 1 based on weak optical fiber Bragg grating array is logged well, which is characterized in that described Temperature sensing optical fiber and the vibrating sensing optical fiber are juxtaposed in the seamless steel pipe.
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| CN201910538388.3A CN110331974A (en) | 2019-06-20 | 2019-06-20 | A kind of novel oilfield well logging optical cable based on weak optical fiber Bragg grating array |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910538388.3A CN110331974A (en) | 2019-06-20 | 2019-06-20 | A kind of novel oilfield well logging optical cable based on weak optical fiber Bragg grating array |
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Cited By (3)
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| CN111897063A (en) * | 2020-07-31 | 2020-11-06 | 中国船舶重工集团公司第七一五研究所 | Temperature measurement optical cable for oil well |
| CN114088241A (en) * | 2021-10-21 | 2022-02-25 | 武汉理工大学 | Weak fiber grating array temperature/vibration composite sensing optical cable and use method thereof |
| CN117433587A (en) * | 2023-12-14 | 2024-01-23 | 江苏南方通信科技有限公司 | Symmetrical-structure multi-parameter weak grating sensing optical cable, sensing system and measuring method |
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| CN111897063A (en) * | 2020-07-31 | 2020-11-06 | 中国船舶重工集团公司第七一五研究所 | Temperature measurement optical cable for oil well |
| CN114088241A (en) * | 2021-10-21 | 2022-02-25 | 武汉理工大学 | Weak fiber grating array temperature/vibration composite sensing optical cable and use method thereof |
| CN117433587A (en) * | 2023-12-14 | 2024-01-23 | 江苏南方通信科技有限公司 | Symmetrical-structure multi-parameter weak grating sensing optical cable, sensing system and measuring method |
| CN117433587B (en) * | 2023-12-14 | 2024-03-19 | 江苏南方通信科技有限公司 | Symmetrical-structure multi-parameter weak grating sensing optical cable, sensing system and measuring method |
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Application publication date: 20191015 |