CN110307920A - Based on noise-modulated fiber optic temperature, stress sensing system and measurement method - Google Patents
Based on noise-modulated fiber optic temperature, stress sensing system and measurement method Download PDFInfo
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- G—PHYSICS
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- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
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- G—PHYSICS
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- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
- G01K11/324—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres using Raman scattering
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/242—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre
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Abstract
The invention discloses one kind to be based on noise-modulated fiber optic temperature, stress sensing system, including semiconductor laser (1), first electrooptic modulator (2), 1 × 3 fiber coupler (3), first optical circulator (4), first bidirectional semiconductor image intensifer (5), second electrooptic modulator (6), second optical circulator (7), second bidirectional semiconductor image intensifer (8), 1 × 2 photoswitch (9), wavelength division multiplexer (10), avalanche photodetector (11), first photodetector (12), second photodetector (13), data collecting card (14), computer (15), three core sensor fibres (16), pulse-modulator (17), the arbitrary waveform generator (18) of 20MHz, thermostat (19).The present invention is detected using the variation of the Rayleigh intensity as caused by sensor fibre Dissipation change when stress variation and the thermally sensitive feature of Raman scattering light intensity, while realizing temperature along optical fiber.
Description
Technical field
The present invention relates to distributed optical fiber sensing system fields, specially a kind of to be based on noise-modulated fiber optic temperature, answer
Power sensor-based system and measurement method.
Background technique
Optical fiber sensing technology has just received common people as a kind of novel sensing technology since 1970s occur
Extensive concern.Optical fiber sensing technology is to realize using optical fiber as laser signal transmission medium to extraneous specific physical quantity
Technology.
Common Distributed Optical Fiber Sensing Techniques are mainly concerned with three kinds of back scattering: Rayleigh scattering, Brillouin scattering, drawing
Graceful scattering.Wherein, Rayleigh intensity is maximum, is easy to detect, is mainly used for breakpoints of optical fiber context of detection；The frequency of Brillouin scattering
Move it is more sensitive to temperature and stress variation, but due to Brillouin scattering will by strain caused by frequency displacement draw with temperature change
It is very difficult that the frequency displacement risen, which accurately distinguishes, therefore brillouin distributed optical fiber sensing device is difficult to finished product and the marketization, and
Cost is high；The luminous intensity of Raman scattering is more sensitive to temperature, and device is relatively simple, therefore current distributed fiber Raman
The technical indicators such as thermometry comparative maturity, temperature resolution and spatial resolution are attained by the requirement of general industry, but
Raman scattering itself is to stress variation and insensitive, therefore the Raman distributed sensing of tradition is not applied in terms of stress sensing.
By above-mentioned introduction it is found that traditional distributed sensing system is main when measuring temperature change at the same time with stress variation
It faces following problems: first is that Brillouin scattering is more sensitive to temperature and stress variation, can all generate the frequency of Brillouin scattering
It moves, but the frequency displacement as caused by strain is difficult to differentiate between in practical situations with frequency displacement caused by temperature change, therefore Brillouin point
Cloth sensing still suffers from larger problem in terms of measurement；Right second is that although Raman scattering is more sensitive to temperature change
Stress variation is simultaneously insensitive, it is also difficult to measurement while realizing temperature and stress.Therefore, in practical applications, a kind of knot is needed
Structure is simple and the method that temperature and stress measure simultaneously may be implemented.
Summary of the invention
It is a kind of based on noise-modulated fiber optic temperature, stress sensing system and measurement method object of the present invention is to propose, it uses
In solving to be difficult to measure temperature and stress variation and chaos simultaneously present in existing distributed optical fiber stress sensor-based system
Not the problem of signal long-distance and high-precision not can be implemented simultaneously.
The present invention is achieved by the following technical scheme:
One kind being based on noise-modulated fiber optic temperature, stress sensing system, including semiconductor laser, the first Electro-optical Modulation
Device, 1 × 3 fiber coupler, the first optical circulator, the first bidirectional semiconductor image intensifer, the second electrooptic modulator, second ring of light
Row device, the second bidirectional semiconductor image intensifer, 1 × 2 photoswitch, wavelength division multiplexer, avalanche photodetector, the first photodetection
Device, the second photodetector, data collecting card, computer, three core sensor fibres, pulse-modulator, 20MHz random waveform hair
Raw device, thermostat.
Wherein, the output end of semiconductor laser passes through the input terminal phase of general single mode wire jumper and the first electrooptic modulator
Even, the output end of the arbitrary waveform generator of the modulated terminal and 20MHz of the first electrooptic modulator is connected, the first electrooptic modulator
Output end be connected with the input terminal of 1 × 3 fiber coupler by general single mode wire jumper, the first of 1 × 3 fiber coupler exports
End is connected by general single mode wire jumper with the input terminal of the first photodetector, and the output end of the first photodetector passes through coaxial
Cable is connected with data collecting card；The second output terminal of 1 × 3 fiber coupler passes through general single mode wire jumper and the first ring of light row
The connection of device one end, the first optical circulator other end are connected by one end of general single mode wire jumper and the first bidirectional semiconductor image intensifer
It connects, the other end of the first bidirectional semiconductor image intensifer passes through the wherein fibre in general single mode wire jumper and three core sensor fibres
Core connection；The third end of first optical circulator is connected by general single mode wire jumper with the input terminal of the second photodetector, and second
The output end of photodetector is connected by coaxial wire with data collecting card；The third output end of 1 × 3 fiber coupler is logical
It crosses general single mode wire jumper to be connected with the input terminal of the second electrooptic modulator, the modulated terminal and pulse-modulator of the second electrooptic modulator
It is connected, the output end of the second electrooptic modulator is connected by general single mode wire jumper with one end of the second optical circulator, the second light
The other end of circulator is connected by general single mode wire jumper with one end of the second bidirectional semiconductor image intensifer, and second two-way partly leads
The other end of body image intensifer is connected with one end of 1 × 2 photoswitch, the other both ends of 1 × 2 photoswitch respectively with three core sense lights
One end of another two fibre cores in fibre is connected, and wherein thermostat progress thermostatic control will be put by one section of optical fiber, as calibration light
Fibre, and the other end of the two fibre cores is connected by wire jumper, form closed loop；The third end of second optical circulator passes through common single
Mould wire jumper is connected with the input terminal of wavelength division multiplexer, and the other end of wavelength division multiplexer is visited by general single mode wire jumper and avalanche optoelectronic
The input terminal for surveying device is connected, and the output end of avalanche photodetector is connected by coaxial wire with data collecting card；Data are adopted
The output end of truck is connected to a computer.
Fiber optic temperature, method for measuring stress specific work process based on above-mentioned sensor-based system are as follows:
(1), the continuous light that semiconductor laser generates carries out noise signal modulation by the first electrooptic modulator, will
The arbitrary waveform generator of 20MHz is as noise signal source, for white Gaussian noise optical signal needed for modulating sensor-based system.
(2), the noise optical signal exported first passes around 1 × 3 fiber coupler and is divided into three Lu Guang, and wherein first via light source is made
For reference light, electric signal is converted to by the first photodetector, is then input in data collecting card；Second road optical signal is made
For pump light all the way, it is directly entered the first optical circulator, then by the first bidirectional semiconductor amplifier, enters eventually into three cores biography
A wherein fibre core in photosensitive fibre, and rear orientation light is generated at the optical fiber each point, then optical fiber rear orientation light passes through
The reflection end of first optical circulator exports, and is converted to electric signal by the second photodetector, is then input to data collecting card
In；It is input in computer after A/D conversion finally by the collected signal of data collecting card.When sensor fibre by
When ess-strain, the cross-sectional diameter of optical fiber can change (scattering section changes), lead to the Rayleigh of the optical fiber position
Scattering strength changes, and specific phenomenon is that the scattering strength of the point is lower.Photodetector is collected into pump light and reference
The electric signal of light carries out the scattered light intensity information that processing obtains optical fiber any position using cross-correlation method.
Wherein, f1(t) light intensity and the functional relation of time issued for light source, f2(t) Rayleigh scattering is received for detector
Light intensity and time function relation, L are sensor fibre light back scattering position (length), and C is the speed that light is propagated in sensor fibre
Degree.Optical fiber can be calculated in the real-time stress variation situation of different location by above-mentioned formula.
(3), third road optical signal enters the second electrooptic modulator by 1 × 3 fiber coupler as another way pump light
Impulse modulation is carried out, then pulsed light is amplified by the second optical circulator using the second bidirectional semiconductor image intensifer
Later, it into 1 × 2 photoswitch, enters back into the loop that three core sensor fibres are configured, and to scattered after generation at optical fiber each point
Light is penetrated, then optical fiber rear orientation light is exported by the reflection end of the second optical circulator, is filtered out Raman by wavelength division multiplexer and is dissipated
Signal is penetrated, the stokes light and anti-Stokes light filtered out is exported from the output end of wavelength division multiplexer, enters avalanche optoelectronic
Detector converts optical signals to electric signal, inputs after A/D conversion finally by the collected signal of data collecting card
Into computer；Processing, which is carried out, using the temperature sensitive properties of the intensity of stokes light and anti-Stokes light obtains optical fiber times
Temperature information at meaning position.
The backscatter data acquired twice is demodulated according to following formula, obtains corresponding temperature.Due to this support
There are correlativity, Stokes light intensity and anti-stokes for temperature locating for the intensity and environment of Ke Si light and anti-Stokes light
The relationship of this light intensity such as following equation,
Wherein, KsWith KaFor stokes light and the scattering section of anti-Stokes light in a fiber, vsWith νaFor stoke
The central wavelength of this light and anti-Stokes light, αaWith αSFor fiber attenuation coefficient.
Wherein, RLoop(T, L) is the temperature modulation function of Raman scattering intensities, RLoop(T0, L0) be Temperature Scaling when Raman
The temperature modulation function of scattering strength, T0For calibration temperature, T is measurement temperature, and h is planck constant, and k is that Boltzmann is normal
Number, L are sensor fibre light back scattering position, L0For the position for calibrating optical fiber.Optical fiber can be calculated by the formula accordingly to pass
The temperature of sense point position.
It is of the present invention to be based on noise-modulated light compared with traditional distributed sensing system based on the above process
Fine temperature, stress sensing system and measurement method have the advantages that
1, compared with traditional distribution type optical fiber sensing equipment, the present invention, which is lost when utilizing stress variation by sensor fibre, to be become
Rayleigh intensity variation caused by changing is detected and the thermally sensitive feature of Raman scattering light intensity, realizes simultaneously
Temperature along optical fiber, real-time measurement while stress, and effectively prevent brillouin distributed sensing and go out in application process
The problem of frequency displacement caused by frequency displacement caused by existing stress variation and temperature change is difficult to differentiate between.
2, the white Gaussian noise modulated optical signal used in the present invention is as sensing optical signal, with traditional distribution type fiber-optic
Sensing device is compared, and the present invention carries out the mode of cross-correlation calculation by reference to light and pump light Rayleigh scattering, is effectively increased
The spatial resolution of sensor-based system.
3, for the present invention compared with the sensor-based system for using chaotic laser light in recent years, maximum feature is to overcome chaotic laser light
Delay characteristics, resolution ratio improve while, still can guarantee that distance sensing is unaffected.
The present invention has rational design, has good application value.
Detailed description of the invention
Fig. 1 shows the present invention is based on the structural schematic diagrams of noise-modulated fiber optic temperature, stress sensing system.
In figure: 1- semiconductor laser, the first electrooptic modulator of 2-, the fiber coupler of 3-1 × 3, the first optical circulator of 4-,
5- the first bidirectional semiconductor image intensifer, the second electrooptic modulator of 6-, the second optical circulator of 7-, 8- the second bidirectional semiconductor light are put
Big device, the photoswitch of 9-1 × 2,10- wavelength division multiplexer, 11- avalanche photodetector, the first photodetector of 12-, the second light of 13-
Electric explorer, 14- data collecting card, 15- computer, tri- core sensor fibre of 16-, 17- pulse-modulator, 18-20MHz's is any
Waveform generator, 19- thermostat.
Specific embodiment
Specific embodiments of the present invention are described in detail with reference to the accompanying drawing.
One kind being based on noise-modulated fiber optic temperature, stress sensing system, including semiconductor laser 1, the first electric light tune
Device 2 processed, 1 × 3 fiber coupler 3, the first optical circulator 4, the first bidirectional semiconductor image intensifer 5, the second electrooptic modulator 6,
Second optical circulator 7, the second bidirectional semiconductor image intensifer 8,1 × 2 photoswitch 9, wavelength division multiplexer 10, avalanche photodetector
11, the first photodetector 12, the second photodetector 13, data collecting card 14, computer 15, three core sensor fibres 16.
As shown in Figure 1, the output end of semiconductor laser 1 passes through the input of general single mode wire jumper and the first Electro-optical Modulation 2
End is connected, and the output end of the arbitrary waveform generator 18 of the modulated terminal and 20MHz of the first electrooptic modulator 2 is connected, the first electricity
The output end of optical modulator 2 is connected by general single mode wire jumper with the input terminal of 1 × 3 fiber coupler 3,1 × 3 fiber coupler
3 the first output end is connected by general single mode wire jumper with the input terminal of the first photodetector 12, the first photodetector 12
Output end be connected with data collecting card 14 by coaxial wire；The second output terminal of 1 × 3 fiber coupler 3 passes through common
Single mode wire jumper is connect with 4 one end of the first optical circulator, and 4 other end of the first optical circulator is two-way by general single mode wire jumper and first
One end of semiconductor optical amplifier 5 connects, and the other end of the first bidirectional semiconductor image intensifer 5 passes through general single mode wire jumper and three
A wherein fibre core connection in core sensor fibre 16；The third end of first optical circulator 4 passes through general single mode wire jumper and second
The input terminal of photodetector 13 is connected, and the output end of the second photodetector 13 passes through coaxial wire and data collecting card 14
It is connected；The third output end of 1 × 3 fiber coupler 3 passes through the input terminal phase of general single mode wire jumper and the second electrooptic modulator 6
Even, the modulated terminal of the second electrooptic modulator 6 is connected with pulse-modulator 17, and the output end of the second electrooptic modulator 6 passes through general
Logical single mode wire jumper is connected with one end of the second optical circulator 7, and the other end of the second optical circulator 7 passes through general single mode wire jumper and the
One end of two bidirectional semiconductor image intensifers 8 is connected, the other end of the second bidirectional semiconductor image intensifer 8 and 1 × 2 photoswitch 9
One end be connected, the other both ends of 1 × 2 photoswitch 9 are connected with one end of another two fibre cores in three core sensor fibres 16 respectively
Connect, by wherein one section of optical fiber of another two fibre cores be put into thermostat 19 carry out thermostatic control, as calibration optical fiber, and by the two
The other end of fibre core is connected by wire jumper, forms closed loop；The third end of second optical circulator 7 passes through general single mode wire jumper and wavelength-division
The input terminal of multiplexer 10 is connected, and the other end of wavelength division multiplexer 10 passes through general single mode wire jumper and avalanche photodetector 11
Input terminal is connected, and the output end of avalanche photodetector 11 is connected by coaxial wire with data collecting card 14；Data acquisition
The output end of card 14 is connected with computer 15.
It is above-mentioned to be based on noise-modulated fiber optic temperature, stress sensing measurement method, include the following steps:
1, the continuous light that DFB semiconductor laser 1 generates carries out noise signal modulation by the first electrooptic modulator 2, will
The arbitrary waveform generator 18 of 20MHz is used as noise signal source, for white Gaussian noise optical signal needed for modulating sensor-based system.
2, stress mornitoring along optical fiber
The white Gaussian noise optical signal of output first passes around 1 × 3 fiber coupler, 3 Fen Wei, tri- Lu Guang, wherein first via light
Source is converted to electric signal as reference light, by the first photodetector 12, is then input in data collecting card 14；Second tunnel
Optical signal is directly entered the first optical circulator 4 as pump light all the way, then by the first bidirectional semiconductor amplifier 5, finally into
Enter the wherein fibre core into three core sensor fibres 16, and generate rear orientation light at the optical fiber each point, then after optical fiber
It is exported to scattering light by the reflection end of the first optical circulator 4, electric signal is converted to by the second photodetector 13, it is then defeated
Enter into data collecting card 14, is input to calculating after A/D conversion finally by the collected signal of data collecting card 14
In machine 15.
When sensor fibre is by ess-strain, the cross-sectional diameter of optical fiber changes (scattering section changes),
The Stokes luminous intensity of the optical fiber position is caused to change, specific phenomenon is that the Stokes luminous intensity of the point is lower.It will
Photodetector collects pump light and the electric signal of reference light carries out processing acquisition optical fiber any position using cross-correlation method
Scattered light intensity information.
Wherein, f1(t) light intensity and the functional relation of time issued for light source, f2(t) Rayleigh scattering is received for detector
Light intensity and time function relation, L are sensor fibre light back scattering position (length), and C is the speed that light is propagated in sensor fibre
Degree.The intensity of the scattering light is linear in the range of optical fiber can be born with suffered stress variation, can by above-mentioned formula
To calculate optical fiber in the real-time stress variation situation of different location.
(3), temperature detection along optical fiber
Third road optical signal as another way pump light, by 1 × 3 fiber coupler 3 enter the second electrooptic modulator 6 into
Row impulse modulation, then pulsed light is amplified by the second optical circulator 7 using the second bidirectional semiconductor image intensifer 8
Later, it by 1 × 2 photoswitch 9, is formed by closed loop into three core sensor fibres 16, when 1 × 2 photoswitch 9 wherein leads to for one
When road is opened, light generates rear orientation light at optical fiber each point, and then optical fiber rear orientation light passes through the anti-of the second optical circulator 7
End output is penetrated, Raman scattering signal is filtered out by wavelength division multiplexer 10, the stokes light and anti-Stokes light filtered out is from wave
The output end of division multiplexer 10 exports, and enters avalanche photodetector 11 and converts optical signals to electric signal, finally by number
It is input in computer 15 after A/D conversion according to the collected signal of capture card 14.Another when 1 × 2 photoswitch 9 is logical
When road is opened, light enters from the other end of loop, and the back scattering of generation returns to the second optical circulator 7 by 1 × 2 photoswitch 9,
Raman scattering signal is filtered out by wavelength division multiplexer 10 again, the stokes light and anti-Stokes light filtered out is from wavelength division multiplexer
10 output end output, enters avalanche photodetector 11 and converts optical signals to electric signal, finally by data collecting card
14 collected signals are input in computer 15 after A/D conversion.
Finally, the backscatter data acquired twice is demodulated according to following formula, corresponding temperature is obtained；Due to
Temperature locating for the intensity and environment of stokes light and anti-Stokes light there are correlativity, Stokes light intensity and it is anti-this
The relationship of lentor light intensity such as following equation:
Wherein, KsWith KaFor stokes light and the scattering section of anti-Stokes light in a fiber, vsWith vaFor stoke
The central wavelength of this light and anti-Stokes light, αaWith αSFor fiber attenuation coefficient.
Wherein, RLoop(T, L) is the temperature modulation function of Raman scattering intensities, RLoop(T0, L0) be Temperature Scaling when Raman
The temperature modulation function of scattering strength, T0For calibration temperature, T is measurement temperature, and h is planck constant, and k is that Boltzmann is normal
Number, L are sensor fibre light back scattering position, L0For the position for calibrating optical fiber.Optical fiber can be calculated by the formula accordingly to pass
The temperature of sense point position.
When specific implementation: the central wavelength of semiconductor laser 1 uses 1550nm；Avalanche probe 11 uses Fby
The avalanche photodetector of photoelectric, DTS1550-DA-MM type.
It should be noted last that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, although ginseng
It is described in detail according to the embodiment of the present invention, those skilled in the art should understand that, to technical solution of the present invention
It is modified or replaced equivalently, without departure from the spirit and scope of technical solution of the present invention, the present invention should all be covered by
In the protection scope of claims.
Claims (2)
1. one kind be based on noise-modulated fiber optic temperature, stress sensing system, it is characterised in that: including semiconductor laser (1),
First electrooptic modulator (2), 1 × 3 fiber coupler (3), the first optical circulator (4), the first bidirectional semiconductor image intensifer
(5), the second electrooptic modulator (6), the second optical circulator (7), the second bidirectional semiconductor image intensifer (8), 1 × 2 photoswitch
(9), wavelength division multiplexer (10), avalanche photodetector (11), the first photodetector (12), the second photodetector (13),
The random waveform generation of data collecting card (14), computer (15), three core sensor fibres (16), pulse-modulator (17), 20MHz
Device (18), thermostat (19)；
Wherein, the output end of semiconductor laser (1) passes through the input terminal phase of general single mode wire jumper and the first electrooptic modulator (2)
Even, the modulated terminal of the first electrooptic modulator (2) is connected with arbitrary waveform generator (18) output end of 20MHz, the first electric light
The output end of modulator (2) is connected by general single mode wire jumper with the input terminal of 1 × 3 fiber coupler (3), 1 × 3 fiber coupling
First output end of device (3) is connected by general single mode wire jumper with the input terminal of the first photodetector (12), and the first photoelectricity is visited
The output end for surveying device (12) is connected by coaxial wire with data collecting card (14)；The second of 1 × 3 fiber coupler (3) is defeated
Outlet is connect by general single mode wire jumper with the first optical circulator (4) one end, and the first optical circulator (4) other end passes through common single
Mould wire jumper is connect with one end of the first bidirectional semiconductor image intensifer (5), the other end of the first bidirectional semiconductor image intensifer (5)
It is connect by general single mode wire jumper with the wherein fibre core in three core sensor fibres (16)；The third of first optical circulator (4)
End is connected by general single mode wire jumper with the input terminal of the second photodetector (13), the output end of the second photodetector (13)
It is connected by coaxial wire with data collecting card (14)；The third output end of 1 × 3 fiber coupler (3) passes through general single mode
Wire jumper is connected with the input terminal of the second electrooptic modulator (6), the modulated terminal of the second electrooptic modulator (6) and pulse-modulator (17)
It is connected, the output end of the second electrooptic modulator (6) is connected by general single mode wire jumper with one end of the second optical circulator (7),
The other end of second optical circulator (7) is connected by general single mode wire jumper with one end of the second bidirectional semiconductor image intensifer (8),
The other end of second bidirectional semiconductor image intensifer (8) is connected with one end of 1 × 2 photoswitch (9), 1 × 2 photoswitch (9) it is another
Outer both ends are connected with one end of another two fibre cores in three core sensor fibres (16) respectively, wherein will be put into constant temperature by one section of optical fiber
Slot (19) carries out thermostatic control, as calibration optical fiber, and the other end of the two fibre cores is connected by wire jumper, forms closed loop；
The third end of second optical circulator (7) is connected by general single mode wire jumper with the input terminal of wavelength division multiplexer (10), wavelength-division multiplex
The other end of device (10) is connected by general single mode wire jumper with the input terminal of avalanche photodetector (11), avalanche photodetector
(11) output end is connected by coaxial wire with data collecting card (14)；The output end and computer of data collecting card (14)
(15) it is connected.
2. one kind is based on noise-modulated fiber optic temperature, stress sensing measurement method, characterized by the following steps:
(1), the continuous light that semiconductor laser (1) generates carries out noise signal modulation by the first electrooptic modulator (2), finally
White Gaussian noise optical signal needed for generating sensor-based system；
(2), stress mornitoring along optical fiber
The white Gaussian noise optical signal of output first passes around 1 × 3 fiber coupler (3) and is divided into three Lu Guang, wherein first via light source
As reference light, electric signal is converted to by the first photodetector (12), is then input in data collecting card (14)；Second
Road optical signal is directly entered the first optical circulator (4) as pump light all the way, then passes through the first bidirectional semiconductor amplifier (5),
The wherein fibre core in three core sensor fibres (16) is entered eventually into, and generates rear orientation light at the optical fiber each point, so
Optical fiber rear orientation light is exported by the reflection end of the first optical circulator (4) afterwards, is converted to by the second photodetector (13)
Electric signal is then input in data collecting card (14), is turned finally by data collecting card (14) collected signal by A/D
It is alternatively input to afterwards in computer (15)；
When sensor fibre is by ess-strain, the cross-sectional diameter of optical fiber changes, and leads to the stoke of the optical fiber position
This luminous intensity changes, and specific phenomenon is that the Stokes luminous intensity of the point is lower；Photodetector is collected into pump light
The scattered light intensity information that processing obtains optical fiber any position, the scattering light are carried out using cross-correlation method with the electric signal of reference light
Intensity and suffered stress variation it is linear in the range of optical fiber can be born, to calculate optical fiber in different location
Real-time stress variation situation；
(3), temperature detection along optical fiber
Third road optical signal as another way pump light, by 1 × 3 fiber coupler (3) enter the second electrooptic modulator (6) into
Row impulse modulation, then pulsed light is carried out by the second optical circulator (7) using the second bidirectional semiconductor image intensifer (8)
After amplification, by 1 × 2 photoswitch (9), it is formed by closed loop into three core sensor fibres (16), when 1 × 2 photoswitch (9)
When wherein an access is opened, light generates rear orientation light at optical fiber each point, and then optical fiber rear orientation light passes through the second light
The reflection end of circulator (7) exports, and filters out Raman scattering signal by wavelength division multiplexer (10), the stokes light filtered out and anti-
Stokes light is exported from the output end of wavelength division multiplexer (10), is entered avalanche photodetector (11) and is converted optical signals to
Electric signal is input in computer (15) after A/D conversion finally by data collecting card (14) collected signal；When
When another access of 1 × 2 photoswitch (9) is opened, light enters from the other end of loop, and the back scattering of generation passes through 1 × 2 light
Switch (9) returns to the second optical circulator (7), then filters out Raman scattering signal by wavelength division multiplexer (10), the stoke filtered out
This light and anti-Stokes light are exported from the output end of wavelength division multiplexer (10), are entered avalanche photodetector (11) and are believed light
Number electric signal is converted to, is input to computer after A/D conversion finally by data collecting card (14) collected signal
(15) in；Finally, due to which there are correlativity, roots for temperature locating for the intensity and environment of stokes light and anti-Stokes light
The temperature of the corresponding sensing point position of optical fiber can be calculated according to the backscatter data acquired twice.
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