CN102928138B - Based on base sheet stresses monitoring device and the method for Brillouin light Time Domain Reflectometry formula Fibre Optical Sensor and optical fiber grating sensing - Google Patents
Based on base sheet stresses monitoring device and the method for Brillouin light Time Domain Reflectometry formula Fibre Optical Sensor and optical fiber grating sensing Download PDFInfo
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Abstract
The invention discloses a kind of base sheet stresses monitoring device based on Brillouin light Time Domain Reflectometry formula Fibre Optical Sensor and optical fiber grating sensing and method, multiple fiber grating is connected in series in single-mode fiber, single-mode fiber is layed in the base plate around cave indoor equipment, the exit of single-mode fiber is connected with photoswitch, photoswitch is connected respectively with fiber grating network demodulation instrument and BOTDR Fiber Analysis instrument, fiber grating network demodulation instrument is connected with industrial computer respectively with BOTDR Fiber Analysis instrument, by the measurement to fiber grating and Brillouin back scattering luminous of fiber grating networking (FBG) demodulator and BOTDR Fiber Analysis instrument, finishing equipment periphery fiber grating cloth sets up an office the measurement of Brillouin shift everywhere on the location at place and single-mode fiber, and then calculate the STRESS VARIATION value of chamber bottom plate, whether monitoring equipment produces inclination unstability.
Description
Technical field
The present invention relates to a kind of down-hole coal separation chamber bottom plate on-line monitoring technique, particularly relate to a kind of base sheet stresses monitoring device based on Brillouin light Time Domain Reflectometry formula Fibre Optical Sensor and optical fiber grating sensing and method.
Background technology
At present, most of coal preparation plant of China still build ground in, adds freight charges and the discharge refuse expense of spoil in raw coal on the one hand, causes the load-carrying capacity anxiety of mine and ton coal profit to decline; On the other hand along with a large amount of gangue land occupations of discharging in coal production, cause the pollution of ground environment, be unfavorable for the improvement of living environment.Build raw coal sorting system in down-hole, realize underground separation of raw coal and filling integration, to reduce raw coal transportation and ton coal energy consumption, improve the recovery ratio of coal resources, realize lasting exploit.
Along with the realization of down-hole coal separation, the safety monitoring and the control system that meet down-hole coal separation chamber also await further development research.Because down-hole coal separation chamber has certain difference compared with tunnel, its monitoring method is also different.First, large equipment for coal preparation is installed in coal separation chamber, occupy most space in chamber, vibration when its weight and production run all may have an impact to the stable of coal mine country rock, so according to equipment performance and the necessary placing installation basis of surrounding rock of chamber distribution situation; Secondly, the electronic interferences in coal separation chamber, electromagnetic interference (EMI) phenomenon are more serious, and corresponding monitoring equipment and system performance must meet the requirement that coal separation is produced, and not only require high to antijamming capability, and not by moist, Effect of Hyperthermic Environment; Moreover the installation of monitoring system can not affect the operation of cleaning unit and destroy the stability of country rock; Finally, around coal separation chamber, shaft sinking and drifting is more, and thus the stressing conditions more complicated of surrounding rock of chamber, is difficult to accurate analysis.
Due to driving or affect by back production and cause the change of coal separation surrounding rock of chamber stress state and the change of its character in maintenance process, roof and floor and two help Instability of Rock Body be out of shape and to cave indoor moving, cause floor rock to loosen, produce end distension, cause large equipment for coal preparation basis local pressure in chamber uneven and produce inclination, offset phenomena, having a strong impact on the safe operation of cleaning unit and the personal safety of staff.At present also not for the correlative study report of down-hole coal separation chamber bottom plate monitoring.
Distributed Optical Fiber Sensing Techniques is one of technology of most future in optical fiber sensing technology, it is the sensing technology adapting to heavy construction safety monitoring and grow up, one-dimensional in its application fiber geometries is measured, using the function of tested parameter as fiber position length, on whole fiber lengths, continuous print measurement can be carried out to the external physical parameter change along fiber geometries path profile, obtain the space distribution state of tested physical parameter and time dependent information simultaneously.
FBG(Fiber Bragg Grating) and BOTDR(Brillouin Optical Time Domain Reflectometry) optical fiber sensing technology is new technology on our times in quasi-distributed and distributed optical fiber sensing system, FBG is the wave zone quasi-distributed optical fiber sensing technology being detected as basis with optical wavelength, the accurate measurement of local can be carried out to institute's geodesic structure, and BOTDR is the optical time domain reflection Distributed Optical Fiber Sensing Techniques based on the backward Brillouin scattering of optical fiber, can in a big way the information of the measured optical fiber space of perception and time variations.
At present, also Distributed Optical Fiber Sensing Techniques is not used for the relevant report for the monitoring of underground coal mine coal separation chamber bottom plate.
Prior art one:
As shown in Figure 1, the existing full-dimension distributed optical fiber sensing monitoring system (patent No. CN201322604Y) with partial high-precision co-linear, brillouin distributed sensing technology and high precision optical fiber grating sensing technology are united two into one by bare fibre and fiber grating conllinear by it, comprise Brillouin sensing demodulation instrument, fiber Bragg grating (FBG) demodulator, photoswitch, transmission armored jumper 01, fiber grating (FBG) 02, bare fibre 03 and sensing probe 04.When testing, by the switching of photoswitch, Fibre Optical Sensor data can respectively by fiber Bragg grating (FBG) demodulator and the demodulation of brillouin distributed sensing data Acquisition Instrument, conversed the strain size of measurement by the ga(u)ge factor of correspondence, super distributed and locally high-precision location and quantitative test can be realized.
At present also not for the Brillouin light Time Domain Reflectometry distributing optical fiber sensing of underground coal mine coal separation chamber bottom plate stress monitoring and the report of optical fiber grating sensing method.
The shortcoming of above-mentioned prior art one is:
Not for the particular surroundings in down-hole coal separation chamber, propose comparatively detailed optical fiber and fiber grating layout scheme, and how to realize the monitoring to base plate, can not underground coal mine coal separation chamber bottom plate stress monitoring.
Summary of the invention
The object of this invention is to provide a kind of base sheet stresses monitoring device based on Brillouin light Time Domain Reflectometry formula Fibre Optical Sensor and optical fiber grating sensing and method.
The object of the invention is to be achieved through the following technical solutions:
Base sheet stresses monitoring device based on Brillouin light Time Domain Reflectometry formula Fibre Optical Sensor and optical fiber grating sensing of the present invention, multiple fiber grating is connected in series in single-mode fiber, single-mode fiber is layed in the base plate around cave indoor equipment, the exit of described single-mode fiber is connected with photoswitch, described photoswitch is connected respectively with fiber grating network demodulation instrument and BOTDR Fiber Analysis instrument, and described fiber grating network demodulation instrument is connected with industrial computer respectively with BOTDR Fiber Analysis instrument.
The above-mentioned base sheet stresses monitoring device based on Brillouin light Time Domain Reflectometry formula Fibre Optical Sensor and optical fiber grating sensing of the present invention carries out the method for base sheet stresses monitoring, by the measurement to fiber grating and Brillouin back scattering luminous of fiber grating networking (FBG) demodulator and BOTDR Fiber Analysis instrument, finishing equipment periphery fiber grating cloth sets up an office the measurement of Brillouin shift everywhere on the location at place and single-mode fiber, and then calculate the STRESS VARIATION value of chamber bottom plate, whether monitoring equipment produces inclination unstability.
As seen from the above technical solution provided by the invention, the base sheet stresses monitoring device based on Brillouin light Time Domain Reflectometry formula Fibre Optical Sensor and optical fiber grating sensing that the embodiment of the present invention provides and method, owing to being connected in series multiple fiber grating in single-mode fiber, single-mode fiber is layed in the base plate around cave indoor equipment, the exit of single-mode fiber is connected with photoswitch, photoswitch is connected respectively with fiber grating network demodulation instrument and BOTDR Fiber Analysis instrument, fiber grating network demodulation instrument is connected with industrial computer respectively with BOTDR Fiber Analysis instrument, by the measurement to fiber grating and Brillouin back scattering luminous of fiber grating networking (FBG) demodulator and BOTDR Fiber Analysis instrument, finishing equipment periphery fiber grating cloth sets up an office the measurement of Brillouin shift everywhere on the location at place and single-mode fiber, and then calculate the STRESS VARIATION value of chamber bottom plate, whether monitoring equipment produces inclination unstability.Be applicable to the monitoring of down-hole coal separation chamber bottom plate stress, can not only coal separation chamber inner bottom plating stress distribution situation under monitor well, and the accurate measurement of equipment periphery monitoring point can be realized, whether monitoring cleaning unit produces inclination.Structure is simple, measures accurately, does not affect chamber bottom plate stability, equipment Foundations globality and person works's safety.
Accompanying drawing explanation
Fig. 1 is the full-dimension distributed structural representation with the optical fiber sensing monitoring system of partial high-precision co-linear of the prior art;
The structural representation of the base sheet stresses monitoring device based on Brillouin light Time Domain Reflectometry formula Fibre Optical Sensor and optical fiber grating sensing that Fig. 2 provides for the embodiment of the present invention;
Fig. 3 is fiber grating string schematic diagram in the single-mode fiber in the embodiment of the present invention.
In figure: 1, single-mode fiber; 2, fiber grating; 3, fiber pigtail; 4, equipment.
Embodiment
To be described in further detail the embodiment of the present invention below.
Base sheet stresses monitoring device based on Brillouin light Time Domain Reflectometry formula Fibre Optical Sensor and optical fiber grating sensing of the present invention, its preferably embodiment be:
Multiple fiber grating is connected in series in single-mode fiber, single-mode fiber is layed in the base plate around cave indoor equipment, the exit of described single-mode fiber is connected with photoswitch, described photoswitch is connected respectively with fiber grating network demodulation instrument and BOTDR Fiber Analysis instrument, and described fiber grating network demodulation instrument is connected with industrial computer respectively with BOTDR Fiber Analysis instrument.
Described single-mode fiber bonding agent is pasted onto on steel strand wires, is laid in the shallow slot on floor around equipment, make the fiber grating on single-mode fiber be in the crucial monitoring point place of cleaning unit, leave certain redundancy around the corner, and fix with shotcrete;
4 to 6 fiber gratings and a fibre optic temperature sensor is laid around every platform equipment.
Described shallow slot is located at distance equipment surrounding 100mm place, and the degree of depth is 9mm-11mm.
The above-mentioned base sheet stresses monitoring device based on Brillouin light Time Domain Reflectometry formula Fibre Optical Sensor and optical fiber grating sensing of the present invention carries out the method for base sheet stresses monitoring, its preferably embodiment be:
By the measurement to fiber grating and Brillouin back scattering luminous of fiber grating networking (FBG) demodulator and BOTDR Fiber Analysis instrument, finishing equipment periphery fiber grating cloth sets up an office the measurement of Brillouin shift everywhere on the location at place and single-mode fiber, and then calculate the STRESS VARIATION value of chamber bottom plate, whether monitoring equipment produces inclination unstability.
Rock pressure [in mine is the main cause causing distension at the bottom of mine, from existing theory, the centre position of chamber inner bottom plating country rock is the most concentrated place of rock pressure [in mine, and cleaning unit occupies most space in coal separation chamber, therefore at the bottom of coal separation chamber, the performance of distension in equipment Foundations is basic slope.Therefore, to the monitoring of down-hole coal separation chamber bottom plate stress, the stress monitoring to cleaning unit basis and peripheral floor can be equal to.When end distension produces, by mechanics distribution situation that is stressed to equipment Foundations and peripheral floor, determine the stable case of down-hole coal separation chamber bottom plate.
Base sheet stresses monitoring device based on Brillouin light Time Domain Reflectometry formula Fibre Optical Sensor and optical fiber grating sensing of the present invention and method, be applicable to the monitoring of down-hole coal separation chamber bottom plate stress.Can not only coal separation chamber inner bottom plating stress distribution situation under monitor well, and the accurate measurement of equipment periphery monitoring point can be realized, whether monitoring cleaning unit produces inclination.Structure is simple, measures accurately, does not affect chamber bottom plate stability, equipment Foundations globality and person works's safety.
Specifically can carry out in the steps below:
1), first on the base plate at distance equipment surrounding 100mm place, the shallow slot that the degree of depth is about 10mm is carved;
2), the single-mode fiber adhesive specially being laid with fiber grating string is pasted onto on steel strand wires;
3), by the single-mode fiber after step 2 along being laid in the shallow slot of step 1, making the fiber grating on single-mode fiber just be in the crucial monitoring point place of cleaning unit, leaving certain redundancy around the corner, and fix with shotcrete;
4), single-mode fiber exit is connected on photoswitch, is then connected with fiber grating network analyzer, BOTDR Fiber Analysis instrument; Fiber grating network analyzer is connected with industrial computer with BOTDR Fiber Analysis instrument;
5), industrial computer sends data to host computer by Transmission Fibers, completes the comparison of data, printing and deposit.
Specific embodiment:
As shown in Figures 2 and 3, what show in the present embodiment is the distribution method being installed on optical fiber and fiber grating in three cleaning unit situations in supposition down-hole coal separation chamber, and the monitoring system formed.Comprise single-mode fiber 1, fiber grating 2, fiber pigtail 3 and equipment 4.
Described single-mode fiber 1 is laid on coal separation chamber equipment 4 around by method as shown in Figure 1, fiber grating 2 is arranged in four corner points of equipment 4, two fiber gratings 2 are also set at the intermediate point of the equipment 4 along chamber length direction simultaneously, this is because existing theory shows, underground coal mine chamber bottom plate centre position STRESS VARIATION is the most concentrated, the most obvious.Neither affect the current and equipment 4 of workman in order to ensure the single-mode fiber 1 laid in chamber bottom plate normally to work, can not damage easily again, therefore, the shallow slot that the degree of depth is 10mm need be opened on base plate, general about the 100mm of shallow slot distance equipment periphery.Described single-mode fiber 1 is pasted onto on steel strand wires by the bonding agent of specialty, and is embedded in shallow slot, is fixed by shotcrete.Bend to less angle when it should be noted that optical fiber in laying, as turned round, fiber reel can be become larger-diameter circular arc, and leave certain redundancy.
Described fiber pigtail 3 is connected with fiber grating network analyzer and BOTDR Fiber Analysis instrument respectively by photoswitch, send the STRESS VARIATION situation demodulation of chamber bottom plate to industrial computer, and be transferred to host computer by transmission cable, realize printing deposit and the process of data.
Described fiber pigtail 3 is not laid in base plate, belongs to Transmission Fibers, does not have sensing effect.The single-mode fiber device be laid in base plate possesses sensing function, can reflect the STRESS VARIATION of base plate.
Its measuring principle is as follows:
Assuming that the single-mode fiber original state be laid in coal separation chamber bottom plate is equilibrium state, the stress intensity that six fiber gratings around so each equipment reflect just as, the stress that single-mode fiber bears is also identical.When chamber bottom plate stress changes, the steel strand wires be laid in base plate also can produce thereupon and stretch or shrink deformation, the single-mode fiber be attached on steel strand wires is responded to, by fiber grating networking (FBG) demodulator and BOTDR Fiber Analysis instrument to fiber grating and the measurement of Brillouin back scattering luminous that receives, to complete on single-mode fiber the measurement of Brillouin shift everywhere and equipment periphery fiber grating cloth to set up an office the location at place, and then calculate the STRESS VARIATION value of chamber bottom plate, whether monitoring equipment produces inclination unstability.
The STRESS VARIATION of chamber inner bottom plating and the sensing of temperature all can have influence on the precision of measurement, when laying optical fiber, the fiber-optical grating temperature sensor of a dead center wavelength need be set specially, be not subject under External Force Acting for optical fiber grating temperature compensation, when temperature variation causes fiber-optical grating temperature sensor wavelength to change, the wavelength of fiber Bragg grating strain sensor is directly deducted the wavelength variable quantity of fiber-optical grating temperature sensor, the wavelength variations of fiber-optic grating sensor can be revised; Simultaneously by the single-mode fiber that about 1m is long, by under External Force Acting, temperature compensation is not being carried out to sensor fibre, eliminating temperature to the impact of sensor fibre test result.
The measuring principle of Brillouin light Time Domain Reflectometry (BOTDR) distributed sensing technology involved in the present invention is as follows:
Brillouin scattering is pressure wave (density wave) the interactional result of incident light and sound wave or propagation.The pressure wave propagated is equivalent to one with certain speed v
b(frequency omega
b) density grating of movement, therefore, Brillouin scattering can think the scattering of incident light on the grating of movement, and Doppler effect makes the frequency of scattered light be different from incident light.Scattered light has a frequency displacement relative to pump light, is commonly referred to Brillouin shift.Its size determines primarily of the acoustic characteristic of optical fiber and Elasticity characteristic.
A large amount of theories and experimental study prove, environment temperature residing for the Brillouin shift of brillouin scattering signal and power and optical fiber and the strain of bearing linearly variation relation under certain condition in optical fiber, and are provided by formula 1 and formula 2:
Δ V
b=C
vTΔ T+C
v ξΔ ξ formula 1
Δ P
b=C
pTΔ T+C
p ξΔ ξ formula 2
Therefore, measure frequency displacement and the power of brillouin scattering signal when known temperature, the coefficient of strain, through type 1 and formula 2 just can obtain temperature and strain information, and Here it is based on the sensor mechanism of the distributed sensing technology of Brillouin scattering.
The distributed sensing of the physical quantity of a certain locus on fiber path is monitored, is not only the physical parameter such as strain, temperature needing to determine this place, needs to orient corresponding locus simultaneously.The Brillouin scattering that in optical fiber, certain a bit returns can represent by formula 3 to the distance Z of instrument:
Wherein, Δ V
bfor Brillouin shift variable quantity; Δ
ξfor strain variation amount; Δ T is temperature variation; C
vTfor Brillouin shift temperature coefficient; C
v ξfor the Brillouin shift coefficient of strain; Δ P
bfor Power of Brillouin variable quantity; C
pTfor Power of Brillouin temperature coefficient; C
p ξfor the Power of Brillouin coefficient of strain.C is the light velocity in vacuum; N is the refraction coefficient of optical fiber; T sends pulsed light to the time interval receiving scattered light.
The measuring principle of fiber grating (FBG) involved in the present invention is as follows:
Fiber grating is exactly one section of optical fiber, has the structure of refractive index periodic change in its fibre core.According to mode coupling theories, λ
b=2n
effthe wavelength of Λ is just reflected back (wherein λ by fiber grating
bfor the centre wavelength of fiber grating, Λ is screen periods, n
effeffective refractive index for fibre core).When fiber grating does the temperature in the probe measurement external world, pressure or stress, the pitch of grating self changes, thus cause the change of reflection wavelength, namely demodulating equipment derives ambient temperature, pressure or stress by the change of determined wavelength, and the drift of the centre wavelength of fiber grating has good linear relationship with temperature, pressure or stress.
Fiber bragg grating center wavelength drift delta λ
bwith the pass of longitudinal strain Δ ε be:
Fiber bragg grating center wavelength drift delta λ
bwith the pass of temperature variation Δ T be:
Fiber bragg grating center wavelength drift delta λ
bwith the pass of pressure change, elta P be:
Wherein P
efor the elasto-optical coefficient of fiber optic materials, α
ffor the thermal expansivity of optical fiber, ξ is the thermo-optical coeffecient of fiber optic materials.
The beneficial effect that technical solution of the present invention is brought:
The STRESS VARIATION that the present invention is directed to down-hole coal separation chamber is monitored, distributed optical fiber sensing device and quasi-distributed optical fiber sensor are combined, not only can obtain the stress consecutive variations situation of chamber bottom plate along fiber distribution, and the STRESS VARIATION situation in precalculated position in chamber can be obtained, reach the object utilizing single-mode fiber to carry out coal separation chamber bottom plate stress monitoring under measuring well.The present invention may bring following beneficial effect:
Structure is simple, measures accurately, does not affect chamber bottom plate stability and person works's safety;
Can effective STRESS VARIATION, the distribution situation of coal separation chamber bottom plate country rock under monitor well, realize rock pressure [in mine STABILITY MONITORING;
STRESS VARIATION for cleaning unit periphery key point in chamber is monitored, and effectively whether can produce inclination by monitoring equipment, and the high precision realizing equipment is run;
Widely applicable, be applicable to the base sheet stresses monitoring of the underground chamber of other various uses.
The above; be only the present invention's preferably embodiment, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claims.
Claims (4)
1. the base sheet stresses monitoring device based on Brillouin light Time Domain Reflectometry formula Fibre Optical Sensor and optical fiber grating sensing, it is characterized in that, multiple fiber grating is connected in series in single-mode fiber, single-mode fiber is layed in the base plate around cave indoor equipment, the exit of described single-mode fiber is connected with photoswitch, described photoswitch is connected respectively with fiber grating network demodulation instrument and BOTDR Fiber Analysis instrument, and described fiber grating network demodulation instrument is connected with industrial computer respectively with BOTDR Fiber Analysis instrument;
Described single-mode fiber bonding agent is pasted onto on steel strand wires, is laid in the shallow slot of equipment surrounding floor, make the fiber grating on single-mode fiber be in the crucial monitoring point place of cleaning unit, leave certain redundancy around the corner, and fix with shotcrete.
2. the base sheet stresses monitoring device based on Brillouin light Time Domain Reflectometry formula Fibre Optical Sensor and optical fiber grating sensing according to claim 1, is characterized in that, lays 4 to 6 fiber gratings and a fibre optic temperature sensor around every platform equipment.
3. the base sheet stresses monitoring device based on Brillouin light Time Domain Reflectometry formula Fibre Optical Sensor and optical fiber grating sensing according to claim 2, is characterized in that, described shallow slot is located at distance equipment surrounding 100mm place, and the degree of depth is 9mm-11mm.
4. the base sheet stresses monitoring device based on Brillouin light Time Domain Reflectometry formula Fibre Optical Sensor and optical fiber grating sensing described in an any one of claims 1 to 3 carries out the method for base sheet stresses monitoring, it is characterized in that, by the measurement to fiber grating and Brillouin back scattering luminous of fiber grating networking (FBG) demodulator and BOTDR Fiber Analysis instrument, finishing equipment periphery fiber grating cloth sets up an office the measurement of Brillouin shift everywhere on the location at place and single-mode fiber, and then calculate the STRESS VARIATION value of chamber bottom plate, whether monitoring equipment produces inclination unstability.
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| CN105115525B (en) * | 2015-08-28 | 2018-01-02 | 东南大学 | A kind of conllinear demodulating system of optical fiber sensing network Integral synchronous and sensor-based system |
| CN105604609B (en) * | 2016-01-11 | 2018-06-15 | 南阳师范学院 | A kind of Novel down-hole chamber bottom plate deformation remote online monitoring system and method |
| CN106092050B (en) * | 2016-08-17 | 2018-08-21 | 河海大学 | A kind of distribution type fiber-optic inclination measurement device and tilt measurement |
| CN106338302B (en) * | 2016-08-22 | 2019-03-12 | 同济大学 | A kind of contact condition monitoring device |
| CN107884107B (en) * | 2017-11-29 | 2023-11-21 | 中国电建集团成都勘测设计研究院有限公司 | Full-time-period ground stress testing system under TBM construction condition |
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| CN201322604Y (en) * | 2008-12-19 | 2009-10-07 | 哈尔滨工业大学 | Full-scale distributed type and local high-precision collinear fibre optic sensing observation system |
| CN101696639A (en) * | 2009-10-16 | 2010-04-21 | 山东大学 | Fiber mine water inrush precursor information monitor |
| CN102221421A (en) * | 2011-03-29 | 2011-10-19 | 宁波诺驰光电科技发展有限公司 | Distributed optical fiber sensor for temperature and strain measurement and measuring method |
| CN102278948A (en) * | 2011-06-30 | 2011-12-14 | 重庆大学 | Compound optical fiber sensing monitoring system and method based on optical fiber compound sensing module |
| CN102384725A (en) * | 2011-09-26 | 2012-03-21 | 南京大学 | Tunnel convergence deformation distribution fiber monitoring method and system thereof |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201322604Y (en) * | 2008-12-19 | 2009-10-07 | 哈尔滨工业大学 | Full-scale distributed type and local high-precision collinear fibre optic sensing observation system |
| CN101696639A (en) * | 2009-10-16 | 2010-04-21 | 山东大学 | Fiber mine water inrush precursor information monitor |
| CN102221421A (en) * | 2011-03-29 | 2011-10-19 | 宁波诺驰光电科技发展有限公司 | Distributed optical fiber sensor for temperature and strain measurement and measuring method |
| CN102278948A (en) * | 2011-06-30 | 2011-12-14 | 重庆大学 | Compound optical fiber sensing monitoring system and method based on optical fiber compound sensing module |
| CN102384725A (en) * | 2011-09-26 | 2012-03-21 | 南京大学 | Tunnel convergence deformation distribution fiber monitoring method and system thereof |
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