CN102221421B - Distributed optical fiber sensor for temperature and strain measurement and measuring method - Google Patents
Distributed optical fiber sensor for temperature and strain measurement and measuring method Download PDFInfo
- Publication number
- CN102221421B CN102221421B CN201110076775.3A CN201110076775A CN102221421B CN 102221421 B CN102221421 B CN 102221421B CN 201110076775 A CN201110076775 A CN 201110076775A CN 102221421 B CN102221421 B CN 102221421B
- Authority
- CN
- China
- Prior art keywords
- module
- optical switch
- temperature
- fiber
- switch module
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The invention discloses a distributed optical fiber sensor for temperature and strain measurement. The sensor comprises a Brillouin optical time domain analyzer module, a detection fiber module, a Raman fiber temperature sensor module and three optical switch modules. Two output ports of the Brillouin optical time domain analyzer module are respectively connected with an optical signal input port of a first optical switch module and an optical signal input port of a third optical switch module. The Raman fiber temperature sensor module is connected with an optical signal input port of a second optical switch module. Two optical signal output ports of the second optical switch module are respectively connected with available optical signal input ports of the first optical switch module and the third optical switch module. An optical signal output port of the first optical switch module is connected with an input terminal of the detection fiber module, and an optical signal output port of the third optical switch module is connected with an output terminal of the detection fiber module. According to the sensor provided in the invention, fiber temperature and strain information that is distributed in a whole course can be obtained by utilizing the switching of optical switch modules.
Description
Technical field
The present invention relates to a kind of fiber optic sensor technology, especially relate to a kind of distribution type fiber-optic temperature and strain transducer and measuring method thereof.
Background technology
Current distributed fiberoptic sensor mainly contains two classes: a class is the Raman fiber sensor, and another kind of is the Brillouin light fiber sensor.The Raman fiber sensor is owing to only possessing temperature measurement function, and application is subject to certain restrictions; And the Brillouin light fiber sensor has been obtained development fast because can measure and be studied widely temperature and strain parameter simultaneously.The Brillouin light fiber sensor by each position of detection fiber dorsad spontaneous the or frequency shift amount relative incident light of stimulated Brillouin scattering light realize the measurement of distributed sensor to temperature and strain, its advantage is that distance sensing is long, spatial resolution is high.But because the Brillouin shift amount is simultaneously responsive to temperature and strain two physical quantitys, and with the two linear dependence, therefore there is in actual applications temperature strain cross sensitivity problem, be difficult to isolate the variable quantity that temperature and strain cause separately from the Brillouin shift amount finally obtained, seriously hindered the engineering of sensors with auxiliary electrode were and promoted.Solving at present the common technology adopted of temperature strain cross sensitivity problem has following several:
1, two parametric methods of scattered light intensity and frequency displacement (J.Smith et al., " Simultaneous distributed strain andtemperature measurement; " Appl.Opt, 38:5372-5377,1999), these class methods are by measure backscattering light intensity and frequency shift amount simultaneously, simultaneous equations solve temperature and strain variation amount, but the Restriction of the Measuring of Brillouin light intensity the detection range of sensor, and light intensity is vulnerable to external disturbance, the impact of the problems such as light source output power shake and polarization state drift.
2, Landau-Placzek ratio method (P.C.Wait and T.P.Newson, " Landau-Placzek ratioapplied todistributed fibre sensing, " Optics Communications, 122 (4-6): 141-146, 1996), these class methods are measured the Brillouin scattering light intensity and to the insensitive Rayleigh scattering light intensity of strain simultaneously, extract temperature variation by calculating the two ratio (Landau-Placzek ratio), but the Restriction of the Measuring of Rayleigh scattering light detection length and the spatial resolution of sensor, the simultaneity factor complexity significantly improves.
3, special fiber method (X.Bao, Q.Yu and L.Chen, " Simultaneous strain and temperaturemeasurements with polarization-maintaining fibers and their error analysis by use ofadistributed Brillouin loss system " Optics letters 29 (12): 1342-1344, 2004), these class methods adopt polarization maintaining optical fibre, photonic crystal fiber, the special fibers such as large effective area fiber are distinguished temperature strain two physical quantitys, but because special fiber is mostly expensive, therefore for long distance applications high cost.
For from solving in essence temperature and strain cross sensitivity problem, other physical influence method of associating has been proposed, as the effect of associating Raman scattering and Brillouin scattering both at home and abroad.External paper Proc.SPIE, the mode that a kind of Raman scattering combines with Brillouin scattering of proposing 2004 " Simultaneousdistributed measurements of temperature and strain using spontaneous raman andBrillouin scattering " realizes that temperature and strain measure simultaneously, but in its system architecture, Raman scattering sensor and Brillouin scattering sensor are used same light source, can't meet the requirement of Raman sensor and Brillouin sensing device, the data precision recorded is low simultaneously.
In May, 2009, the Chinese invention patent instructions of CN200710156868.0 of Granted publication on the 27th disclosed a kind of " very-long-range distributed fiber Raman and Brillouin's photon sensor ", proposed distributed optical fiber Raman photons temperature sensors, the mode that distribution type fiber-optic Brillouin photon strain transducer and distributed fiber Raman fiber amplifier merge, realize that temperature and strain measure simultaneously, but the light source of its Brillouin sensing device and the light source of Raman sensor have adopted the mode of common optical fiber coupling mechanism, increased the loss of luminous power, and the light source of its Brillouin sensing device has adopted exocoel narrow-band impulse fiber laser, pulsed light has difficulties when relevant the detection.
In May, 2009, the Chinese invention patent instructions of CN200710175868.5 of Granted publication on the 20th disclosed a kind of " optical fiber distributed temperature and stress sensing device ", proposed fiber raman scattering as temperature information, Brillouin scattering as strain information distributed sensing temperature and strain simultaneously, provided the calibration formula of temperature and strain, but its measuring optical fiber is polarization maintaining optical fibre, limited the range of application of sensor.
In sum, can effectively solve temperature and strain cross sensitivity problem in conjunction with Raman scattering and Brillouin scattering effect, but existing combination is mainly common light source, adopt special fiber or use fiber coupler, like this or the temperature recorded and strain parameter precision inadequate, perhaps cost is high, range of application is narrow, and existing associated methods is all the Brillouin light time domain reflection sense device (BOTDR) for single-ended measurement, can not be for the Brillouin optical time domain analysis sensor (BOTDA) of double-end measurement mode, due to Brillouin light time domain reflection sense device (BOTDR) measurement is very faint spontaneous brillouin scattering light, and Brillouin optical time domain analysis sensor (BOTDA) measurement is stronger stimulated Brillouin scattering light, therefore BOTDA to the measuring accuracy of temperature and strain far above BOTDR, and measurement range is larger.
Summary of the invention
Technical matters to be solved by this invention is to provide the distributed fiberoptic sensor of a kind of applicable Brillouin optical time domain analysis sensor (BOTDA), utilize this sensor can solve temperature and strain cross sensitivity problem, realize that temperature and strain parameter measure simultaneously.
The present invention solves the problems of the technologies described above adopted technical scheme: a kind of distribution type fiber-optic temperature and strain transducer, comprise the Brillouin light time domain analyzer module, the detection optical fiber module, the Raman fiber temperature sensor module, the first optical switch module, the second optical switch module and the 3rd optical switch module, described the first optical switch module and described the 3rd optical switch module are respectively arranged with two light signal input ports and a light signal output end mouth, described the second optical switch module is provided with a light signal input port and two light signal output end mouths, described Brillouin light time domain analyzer module is provided with two output ports, an output port of described Brillouin light time domain analyzer module is connected with a light signal input port of described the first optical switch module, another output port of described Brillouin light time domain analyzer module is connected with a light signal input port of described the 3rd optical switch module, described Raman fiber temperature sensor module is connected with the light signal input port of described the second optical switch module, two light signal output end mouths of described the second optical switch module are connected with the vacant light signal input port on described the 3rd optical switch module with described the first optical switch module respectively, the light signal output end mouth of described the first optical switch module is connected with the input end of described detection optical fiber module, the light signal output end mouth of described the 3rd optical switch module is connected with the output terminal of described detection optical fiber module.
The Brillouin light fiber sensor that described Brillouin light time domain analyzer module is made for utilizing the stimulated Brillouin scattering effect.
Described Raman fiber temperature sensor module is for measuring the raman type optical fiber temperature measuring sensor of single-mode fiber.
Described the first optical switch module, the second optical switch module and the 3rd optical switch module are 1 * 2 photoswitch.
Described detection optical fiber module is single-mode fiber.
Described detection optical fiber module is comprised of multifiber cable and optical fibre welded module.
A kind of distribution type fiber-optic temperature and strain transducer are measured the method for temperature and strain, it is characterized in that it comprises the following steps:
The step of a, measurement temperature:
A-1, control the first optical switch module and the 3rd optical switch module, two output terminals of Brillouin light time domain analyzer module and detection optical fiber module are disconnected, two output terminals of the second optical switch module are communicated with the detection optical fiber module;
A-2, control the second optical switch module, the Raman fiber temperature measurement signal is input in the detection optical fiber module through the first optical switch module forward, obtain the temperature information distributed along the detection optical fiber forward;
A-3, control the second optical switch module, the Raman fiber temperature measurement signal oppositely is input in the detection optical fiber module through the 3rd optical switch module, obtain the temperature information oppositely distributed along detection optical fiber;
By the temperature that obtains in step a-2 or by the temperature that obtains in step a-3, with distance, oppositely or using the temperature of step a-2 and step a-3 with distance, the temperature after oppositely is averaged as the temperature measurement result T along the distribution of detection optical fiber forward a-4
r(L) the fiber-optic probe distance that, L is the detection optical fiber module;
The step of b, monitor strain:
B-1, control the first optical switch module and the 3rd optical switch module, Raman fiber temperature sensor module and detection optical fiber module are disconnected, the two ends of Brillouin light time domain analyzer module and detection optical fiber module two ends are communicated with, and detect and obtain the frequency shift amount Δ v distributed along the detection optical fiber forward
b(L) the fiber-optic probe distance that, L is the detection optical fiber module;
B-2, according to the temperature measurement result T that utilizes the Raman fiber temperature sensor to obtain in step a
rand the frequency shift amount Δ v obtained in step (1) (L)
b(L), calculate the strain that distributes along detection optical fiber forward ε (L) as a result:
C in formula
t, C
εrespectively temperature and the coefficient of strain of Brillouin shift.
Compared with prior art, the invention has the advantages that by the switching controls of three optical switch modules, make Raman fiber temperature sensor module and the Brillouin light time domain analyzer module of setting relatively independent to the measurement maintenance of temperature and strain, utilize the temperature measurement result of Raman fiber temperature sensor module as benchmark, from having solved in essence Brillouin optical time domain analysis module temperature and strain cross sensitivity problem; Raman fiber temperature sensor module output signal can enter respectively the two ends of detection optical fiber by the switching of three optical switch modules in addition, both can realize the single-ended measurement of fiber optic temperature, also can realize the fiber optic temperature double-end measurement.The double-end measurement mode has the insensitive advantage of fibre loss, particularly when remote optical fiber temperature-measurement, double-end measurement has overcome the weakness of tail end low precision when traditional Raman fiber temperature sensor is single-ended to be measured, effectively guaranteed temperature accuracy when remote fiber-optic probe, increase the length of optical fiber measurement, expanded measurement range; Due to the application of optical switch module, reduce the on-off times of laser instrument in Raman fiber temperature sensor module and Brillouin light time domain analyzer module in addition, extended the serviceable life of Fibre Optical Sensor.
The accompanying drawing explanation
Fig. 1 is distribution type fiber-optic temperature and the strain transducer that the detection optical fiber module is single-mode fiber;
Fig. 2 is distribution type fiber-optic temperature and the strain sensing that the detection optical fiber module consists of twin fiber cable and tail end welding;
Fig. 3 is fiber optic temperature double-end measurement mode temperature stack schematic diagram.
Embodiment
As depicted in figs. 1 and 2, a kind of distribution type fiber-optic temperature and strain transducer, comprise Brillouin light time domain analyzer module 1, Raman fiber temperature sensor module 2, the first optical switch module 3, the second optical switch module 4, the 3rd optical switch module 5 and detection optical fiber module 6, Brillouin light time domain analyzer module 1 is provided with output port 11 and output port 12, the first optical switch module 3 is provided with light signal input port 31, light signal input port 32 and light signal output end mouth 33, the second optical switch module 4 is provided with light signal input port 41, light signal output end mouth 42 and light signal output end mouth 43, the 3rd optical switch module 5 is provided with light signal input port 51, light signal input port 52 and light signal output end mouth 53, an output port 11 of Brillouin light time domain analyzer module 1 is connected with the light signal input port 31 of the first optical switch module 3, another output port 12 of Brillouin light time domain analyzer module 1 is connected with the light signal input port 52 of the 3rd optical switch module 5, Raman fiber temperature sensor module 2 is connected with the light signal input port 41 of the second optical switch module 4, the light signal output end mouth 42 of the second optical switch module 4 is connected with the vacant light signal input port 32 on the first optical switch module 3, the light signal output end mouth 43 of the second optical switch module 4 is connected with the vacant light signal input port 51 on the 3rd optical switch module 5, the light signal output end mouth 33 of the first optical switch module 3 is connected with the input end of detection optical fiber module 6, the light signal output end mouth 53 of the 3rd optical switch module 5 is connected with the output terminal of detection optical fiber module 6.
Embodiment mono-: as shown in Figure 1, the Brillouin light fiber sensor that Brillouin light time domain analyzer module 1 is made for utilizing the stimulated Brillouin scattering effect, Raman fiber temperature sensor module 2 is for measuring the raman type optical fiber temperature measuring sensor of single-mode fiber, the first optical switch module 3, the second optical switch module 4 and the 3rd optical switch module 5 are 1 * 2 photoswitch, detection optical fiber module 6 is single-mode fiber, and the two ends of single-mode fiber are directly as the input/output terminal of detection optical fiber module.
At first adopt Raman fiber temperature sensor measurement fiber optic temperature, now the first optical switch module 3 is set to light signal input port 32 to light signal output end mouth 33 paths, and light signal input port 31 is forbidden to light signal output end mouth 33; The 3rd optical switch module 5 is set to light signal input port 51 to light signal output end mouth 53 paths, and light signal input port 52 is forbidden to light signal output end mouth 53.Now, the first optical switch module 3 and the 3rd optical switch module 5 disconnect Brillouin light time domain analyzer module 1 and detection optical fiber module 6, and Raman fiber temperature sensor module 2 is connected with detection optical fiber module 6 by three optical switch modules.The second optical switch module 4 is set to light signal input port 41 to light signal output end mouth 42 paths, and light signal input port 41 is forbidden to light signal output end mouth 43; Now, the detection light signal of Raman fiber sensor for measuring temperature module 2 outputs is from the second optical switch module 4 inputs, detect the temperature of forward optical fiber through the first optical switch module 3 forward input detection optical fiber modules 6, now utilizing Raman fiber temperature sensor 2 to measure measured optical fiber forward temperature is T
r(L).
After obtaining the fiber optic temperature testing result, the first optical switch module 3 is set to light signal input port 31 to light signal output end mouth 33 paths, and light signal input port 32 is forbidden to light signal output end mouth 33; The 3rd optical switch module 5 is set to light signal input port 52 to light signal output end mouth 53 paths, and light signal input port 51 is forbidden to light signal output end mouth 53.Now, the first optical switch module 3 and the 3rd optical switch module 5 disconnect Raman fiber temperature sensor module 2 and detection optical fiber module 6, Brillouin light time domain analyzer module 1 is connected with detection optical fiber module 6 by three optical switch modules, system is enabled optical fiber Brillouin frequency displacement measurement function, the temperature of optical fiber and strain affect Brillouin shift simultaneously, and the frequency shift amount of detection optical fiber module 6 each sections that Brillouin light time domain analyzer module 1 records is designated as Δ v
b(L), the relation by Brillouin shift and temperature strain can show that the distribution of optical fiber strain along the line is designated as ε (L), as shown in the formula (1) formula.
In formula, C
t, C
εrespectively temperature, the coefficient of strain of Brillouin shift, for common single-mode fiber, temperature coefficient C
tget 1.07MHz/ ℃, coefficient of strain C
εget 0.05MHz/ μ ε.
In sum, in conjunction with the optical fiber forward temperature T obtained from Raman fiber sensor assembly 2
r(L) with Brillouin light time domain analyzer module 1 in the Brillouin shift Δ v that obtains
b(L) can draw the strain information of optical fiber whole process, realize that temperature and strain measure simultaneously.
Embodiment bis-: as shown in Figure 2, the Brillouin light fiber sensor that Brillouin light time domain analyzer module 1 is made for utilizing the stimulated Brillouin scattering effect, Raman fiber temperature sensor module 2 is for measuring the raman type optical fiber temperature measuring sensor of single-mode fiber, and the first optical switch module 3, the second optical switch module 4 and the 3rd optical switch module 5 are 1 * 2 photoswitch; Detection optical fiber module 6 is comprised of optical fibre welded module 7 and twin fiber cable 8, wherein twin fiber cable 8 comprises two single-mode fibers, a wherein end of two single-mode fibers links together by optical fibre welded module 7, the other end 61 of two single-mode fibers and 62 two input ends as detection optical fiber module 6.
At first adopt Raman fiber temperature sensor measurement fiber optic temperature, now the first optical switch module 3 is set to light signal input port 32 to light signal output end mouth 33 paths, and light signal input port 31 is forbidden to light signal output end mouth 33; The 3rd optical switch module 5 is set to light signal input port 51 to light signal output end mouth 53 paths, and light signal input port 52 is forbidden to light signal output end mouth 53.Now, the first optical switch module 3 and the 3rd optical switch module 5 disconnect Brillouin light time domain analyzer module 1 and detection optical fiber module 6, and Raman fiber temperature sensor module 2 is connected with detection optical fiber module 6 by three optical switch modules.The second optical switch module 4 is set to light signal input port 41 to light signal output end mouth 42 paths, and light signal input port 41 is forbidden to light signal output end mouth 43; Now, the detection light signal of Raman fiber sensor for measuring temperature module 2 outputs is from the second optical switch module 4 inputs, detect the temperature of detection optical fiber through the first optical switch module 3 input detection optical fiber modules 6, now utilizing the measured optical fiber forward of Raman fiber temperature sensor 2 temperature is T
r(L).
After obtaining the fiber optic temperature testing result, the first optical switch module 3 is set to light signal input port 31 to light signal output end mouth 33 paths, and light signal input port 32 is forbidden to light signal output end mouth 33; The 3rd optical switch module 5 is set to light signal input port 52 to light signal output end mouth 53 paths, and light signal input port 51 is forbidden to light signal output end mouth 53.Now, the first optical switch module 3 and the 3rd optical switch module 5 disconnect Raman fiber temperature sensor module 2 and detection optical fiber module 6, Brillouin light time domain analyzer module 1 is connected with detection optical fiber module 6 by three optical switch modules, system is enabled optical fiber Brillouin frequency displacement measurement function, the temperature of optical fiber and strain affect Brillouin shift simultaneously, and the frequency shift amount of detection optical fiber module 6 each sections that Brillouin light time domain analyzer module 1 records is designated as Δ v
b(L), the relation by Brillouin shift and temperature strain can show that the distribution of optical fiber strain along the line is designated as ε (L), as shown in the formula (1) formula.
In formula, C
t, C
εrespectively temperature, the coefficient of strain of Brillouin shift, for common single-mode fiber, temperature coefficient C
tget 1.07MHz/ ℃, coefficient of strain C
εget 0.05MHz/ μ ε.
In sum, in conjunction with the optical fiber forward temperature T obtained from Raman fiber sensor assembly 2
r(L) with Brillouin light time domain analyzer module 1 in the Brillouin shift Δ v that obtains
b(L) can draw the strain information of optical fiber whole process, realize the measurement of temperature and strain.
Embodiment tri-: the present embodiment structure is with embodiment bis-, different from embodiment bis-, originally is implemented in the Raman fiber thermometric and has adopted double-end measurement mode, double-end measurement mode temperature stack schematic diagram as shown in figure (3).
At first adopt Raman fiber temperature sensor measurement fiber optic temperature, now the first optical switch module 3 is set to light signal input port 32 to light signal output end mouth 33 paths, and light signal input port 31 is forbidden to light signal output end mouth 33; The 3rd optical switch module 5 is set to light signal input port 51 to light signal output end mouth 53 paths, and light signal input port 52 is forbidden to light signal output end mouth 53.Now, the first optical switch module 3 and the 3rd optical switch module 5 disconnect Brillouin light time domain analyzer module 1 and detection optical fiber module 6, Raman fiber temperature sensor module 2 is connected with detection optical fiber module 6 by three optical switch modules, can input end 61 and input end 62 inputs from detection optical fiber module 6 by the Raman fiber temperature measurement signal respectively by the switching of the second optical switch module 4.The second optical switch module 4 is set to light signal input port 41 to light signal output end mouth 42 paths, and light signal input port 41 is forbidden to light signal output end mouth 43; Now, the detection light signal of Raman fiber sensor for measuring temperature module 2 outputs, from the second optical switch module 4 inputs, detects detection optical fiber forward temperature through the first optical switch module 3 input detection optical fiber modules 6, and now the measuring optical fiber temperature is designated as T
1(L
1).The second optical switch module 4 is set to light signal input port 41 to light signal output end mouth 43 paths, and light signal input port 41 is forbidden to light signal output end mouth 42; Now, the detection light signal of Raman fiber sensor for measuring temperature module 2 outputs, from the second optical switch module 4 inputs, detects the reverse temperature of detection optical fiber through the 3rd optical switch module 5 input detection optical fiber modules 6, and now the measuring optical fiber temperature is designated as T
2(L
2).The distance that now fiber distance L2 is fiber distance the second optical switch module place, and the distance that L1 is fiber distance the first optical switch module place, therefore, it is L1=L-L2 that two fiber position are closed, wherein L is fiber lengths, and forward is measured to temperature T
1(L
1) and oppositely measure temperature T
2(L
2) be the temperature detection result in whole piece detection optical fiber module 6 apart from being averaged after negate, now utilize the temperature variation that the fine distance of Raman fiber temperature sensor 2 double-end measurement mode institutes photometry is the L place to be designated as
as shown in figure (3), when single-ended measurements, little at the measuring junction temperature noise, the tail end temperature noise is larger, after the employing double-end measurement, measuring junction and tail end noise are all less, and the temperature on whole piece optical fiber is even.
After obtaining the fiber optic temperature testing result, the first optical switch module 3 is set to light signal input port 31 to light signal output end mouth 33 paths, and light signal input port 32 is forbidden to light signal output end mouth 33; The 3rd optical switch module 5 is set to light signal input port 52 to light signal output end mouth 53 paths, and light signal input port 51 is forbidden to light signal output end mouth 53.Now, the first optical switch module 3 and the 3rd optical switch module 5 disconnect Raman fiber temperature sensor module 2 and detection optical fiber module 6, Brillouin light time domain analyzer module 1 is connected with detection optical fiber module 6 by three optical switch modules, system is enabled optical fiber Brillouin frequency displacement measurement function, the temperature of optical fiber and strain affect Brillouin shift simultaneously, and the frequency shift amount of detection optical fiber module 6 each sections that Brillouin light time domain analyzer module 1 records is designated as Δ v
b(L), the relation by Brillouin shift and temperature strain can show that the distribution of optical fiber strain along the line is designated as ε (L), as shown in the formula (1) formula.
In formula, C
t, C
εrespectively temperature, the coefficient of strain of Brillouin shift, for common single-mode fiber, temperature coefficient C
tget 1.07MHz/ ℃, coefficient of strain C
εget 0.05MHz/ μ ε.
In sum, the fiber optic temperature T obtained in conjunction with double-end measurement from Raman fiber sensor assembly 2
r(L) with Brillouin light time domain analyzer module 1 in the Brillouin shift Δ v that obtains
b(L) can draw the strain information of optical fiber whole process, realize the measurement of temperature and strain.
Claims (6)
1. one kind is used distribution type fiber-optic temperature and strain transducer to measure the method for temperature and strain, distribution type fiber-optic temperature and strain transducer comprise Brillouin light time domain analyzer module and detection optical fiber module, characterized by further comprising the Raman fiber temperature sensor module, the first optical switch module, the second optical switch module and the 3rd optical switch module, described the first optical switch module and described the 3rd optical switch module are respectively arranged with two light signal input ports and a light signal output end mouth, described the second optical switch module is provided with a light signal input port and two light signal output end mouths, described Brillouin light time domain analyzer module is provided with two output ports, an output port of described Brillouin light time domain analyzer module is connected with a light signal input port of described the first optical switch module, another output port of described Brillouin light time domain analyzer module is connected with a light signal input port of described the 3rd optical switch module, described Raman fiber temperature sensor module is connected with the light signal input port of described the second optical switch module, two light signal output end mouths of described the second optical switch module are connected with the vacant light signal input port on described the 3rd optical switch module with described the first optical switch module respectively, the light signal output end mouth of described the first optical switch module is connected with the input end of described detection optical fiber module, the light signal output end mouth of described the 3rd optical switch module is connected with the output terminal of described detection optical fiber module, specifically comprise the following steps:
The step of a, measurement temperature:
A-1, control the first optical switch module and the 3rd optical switch module, two output terminals of Brillouin light time domain analyzer module and detection optical fiber module are disconnected, two output terminals of the second optical switch module are communicated with the detection optical fiber module;
A-2, control the second optical switch module, the Raman fiber temperature measurement signal is input in the detection optical fiber module through the first optical switch module forward, obtain the temperature information distributed along the detection optical fiber forward;
A-3, control the second optical switch module, the Raman fiber temperature measurement signal oppositely is input in the detection optical fiber module through the 3rd optical switch module, obtain the temperature information oppositely distributed along detection optical fiber;
By the temperature that obtains in step a-2 or by the temperature that obtains in step a-3, with distance, oppositely or using the temperature of step a-2 and step a-3 with distance, the temperature after oppositely is averaged as the temperature measurement result along the distribution of detection optical fiber forward a-4
t r (
l),
lfiber-optic probe distance for the detection optical fiber module;
The step of b, monitor strain:
B-1, control the first optical switch module and the 3rd optical switch module, Raman fiber temperature sensor module and detection optical fiber module are disconnected, the two ends of Brillouin light time domain analyzer module and detection optical fiber module two ends are communicated with, and detect and obtain the frequency shift amount Δ distributed along the detection optical fiber forward
v b (
l),
lfiber-optic probe distance for the detection optical fiber module;
B-2, according to the temperature measurement result of utilizing the Raman fiber temperature sensor to obtain in step a
t r (
l) and step b-1 in the frequency shift amount Δ that obtains
v b (
l), calculate the strain result distributed along the detection optical fiber forward
ε(
l):
In formula
c t ,
c ε respectively temperature and the coefficient of strain of Brillouin shift.
2. the method for measurement temperature as claimed in claim 1 and strain, is characterized in that the Brillouin light fiber sensor that described Brillouin light time domain analyzer module is made for utilizing the stimulated Brillouin scattering effect.
3. the method for measurement temperature as claimed in claim 1 and strain, is characterized in that described Raman fiber temperature sensor module is for measuring the raman type optical fiber temperature measuring sensor of single-mode fiber.
4. the method for measurement temperature as claimed in claim 1 and strain, is characterized in that described the first optical switch module, the second optical switch module and the 3rd optical switch module are 1 * 2 photoswitch.
5. the method for measurement temperature as claimed in claim 1 and strain, is characterized in that described detection optical fiber module is single-mode fiber.
6. the method for measurement temperature as claimed in claim 1 and strain, is characterized in that described detection optical fiber module is comprised of multifiber cable and optical fibre welded module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110076775.3A CN102221421B (en) | 2011-03-29 | 2011-03-29 | Distributed optical fiber sensor for temperature and strain measurement and measuring method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110076775.3A CN102221421B (en) | 2011-03-29 | 2011-03-29 | Distributed optical fiber sensor for temperature and strain measurement and measuring method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102221421A CN102221421A (en) | 2011-10-19 |
| CN102221421B true CN102221421B (en) | 2014-01-08 |
Family
ID=44778035
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110076775.3A Active CN102221421B (en) | 2011-03-29 | 2011-03-29 | Distributed optical fiber sensor for temperature and strain measurement and measuring method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102221421B (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102735272B (en) * | 2012-06-08 | 2015-07-08 | 浙江中欣动力测控技术有限公司 | Barrier-searchable Brillouin optical time domain analyzer |
| CN102928138B (en) * | 2012-10-29 | 2015-07-29 | 南阳理工学院 | 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 |
| CN103323139A (en) * | 2013-05-27 | 2013-09-25 | 云南电力试验研究院（集团）有限公司电力研究院 | Distribution type optical fiber monitoring method for monitoring OPGW running status |
| CN103323138A (en) * | 2013-05-27 | 2013-09-25 | 云南电力试验研究院（集团）有限公司电力研究院 | Distribution type optical fiber monitoring method for monitoring cables of power distribution network |
| CN103292831B (en) * | 2013-05-31 | 2016-01-20 | 武汉康特圣思光电技术有限公司 | The single-ended Brillouin optical time domain analysis sensor of fiber grating reflection filter structure |
| CN103698049B (en) * | 2013-12-18 | 2016-09-14 | 中国能源建设集团广东省电力设计研究院有限公司 | Distributed Measurement System based on Brillouin scattering and method |
| CN106768278B (en) * | 2017-01-06 | 2020-07-31 | 天津大学 | Distributed optical fiber vibration and temperature dual-physical quantity sensing and positioning system |
| CN107631957A (en) * | 2017-09-20 | 2018-01-26 | 北京邮电大学 | A kind of circumstances not known fluid density based on BOTDR technologies calculates method |
| CN110243301A (en) * | 2018-03-08 | 2019-09-17 | 桂林电子科技大学 | It is a kind of based on dynamic BOTDA by core scan-type multi-core optical fiber shape sensor |
| CN112611410B (en) * | 2020-12-08 | 2022-08-05 | 苏州光格科技股份有限公司 | BOTDA system and automatic fiber breaking positioning method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6817759B2 (en) * | 2001-11-30 | 2004-11-16 | National Chiao Tung University | Method of enhancing spatial resolution for distributed temperature measurement |
| CN101893456A (en) * | 2010-07-14 | 2010-11-24 | 宁波诺驰光电科技发展有限公司 | Loop type optical fiber sensor |
| CN101900611A (en) * | 2010-07-14 | 2010-12-01 | 宁波诺驰光电科技发展有限公司 | Device and method for simultaneously measuring temperature and stress by using distributed optical fiber sensor |
| CN201955173U (en) * | 2011-03-29 | 2011-08-31 | 宁波诺驰光电科技发展有限公司 | Distributed optical fiber temperature-strain measurement sensor |
-
2011
- 2011-03-29 CN CN201110076775.3A patent/CN102221421B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6817759B2 (en) * | 2001-11-30 | 2004-11-16 | National Chiao Tung University | Method of enhancing spatial resolution for distributed temperature measurement |
| CN101893456A (en) * | 2010-07-14 | 2010-11-24 | 宁波诺驰光电科技发展有限公司 | Loop type optical fiber sensor |
| CN101900611A (en) * | 2010-07-14 | 2010-12-01 | 宁波诺驰光电科技发展有限公司 | Device and method for simultaneously measuring temperature and stress by using distributed optical fiber sensor |
| CN201955173U (en) * | 2011-03-29 | 2011-08-31 | 宁波诺驰光电科技发展有限公司 | Distributed optical fiber temperature-strain measurement sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102221421A (en) | 2011-10-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102221421B (en) | Distributed optical fiber sensor for temperature and strain measurement and measuring method | |
| CN102706477B (en) | Distributed optical fiber sensing device and method for simultaneously measuring temperature and strain | |
| CN101900611B (en) | Device and method for simultaneously measuring temperature and stress by using distributed optical fiber sensor | |
| CN103674086B (en) | Measure entirely with method and the device of weak optical fiber Bragg grating temperature and strain based on Brillouin scattering simultaneously | |
| CN103674117B (en) | Measure entirely method and device with weak optical fiber Bragg grating temperature and strain based on Raman scattering simultaneously | |
| CN102721484B (en) | Distributed optical fiber sensing device based on brillouin scattering | |
| CN102607621A (en) | Distributed optical fiber Brillouin sensing device and method thereof for detecting temperature and strain synchronously | |
| CN202648830U (en) | A distributed fiber sensing device based on Brillouin scattering | |
| CN102288388B (en) | Device and method for improving polarization-maintaining optical fiber polarization coupling measurement precision and symmetry | |
| CN102494801B (en) | Distributed optical delay optical fiber temperature sensor | |
| CN201876324U (en) | Double-light source light path structure of distributed optical fiber Raman temperature sensor | |
| CN201955173U (en) | Distributed optical fiber temperature-strain measurement sensor | |
| CN102980681A (en) | Distributed strain and temperature optical fiber sensor based on brillouin scattering | |
| CN104614092A (en) | Modular interface temperature sensor of liquid-core optical fiber | |
| CN102494874B (en) | Tunable laser type fiber Bragg grating wavelength demodulation device | |
| CN107036733A (en) | The many reference amounts Distributed Measurement System and measuring method of twin-core dim light grid array based on dark pulse light source | |
| CN101706329B (en) | Optical fiber temperature sensor | |
| CN104568019A (en) | Multimode fiber-based method and multimode fiber-based system for simultaneously measuring temperature and strain | |
| CN106802190A (en) | A kind of highly sensitive optic fibre turning sensor without Temperature cross-over interference | |
| CN101949743B (en) | Novel Brillouin time domain analyzer | |
| CN103852191A (en) | Optical fiber temperature sensor insensitive to refractive index | |
| CN101290248A (en) | Single-mode infra-red wavemeter based on Mach-Zehnder Interferometer filtering principle | |
| CN101261164A (en) | Juxtaposed distributed optical fibre temperature sensor | |
| CN105092085A (en) | Single-mode core-dislocated fiber temperature measurement method based on dual-coupling structure having correction function | |
| CN114137273A (en) | Temperature sensitive current eliminating sensing device of FBG (fiber Bragg Grating) cascade optical fiber composite structure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: ZHEJIANG ZHONGXIN POWER MEASURING + CONTROLING TEC Free format text: FORMER OWNER: NINGBO NUOTCH PHOTOELECTRIC TECHNOLOGY DEVELOPMENT CO., LTD. Effective date: 20140529 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20140529 Address after: 315010 Yongfeng North Road, Haishu, Zhejiang, No. 63, No. Patentee after: Zhejiang Zhongxin Power Measurement and Control Technology Co., Ltd. Address before: Haishu District of Zhejiang province 315010 Bu Zheng Xiang, Ningbo City No. 16 Chong Building Room 1201 Patentee before: Ningbo Nuotch Optoelectronics Co., Ltd. |