CN107687939A - A kind of interference type optical fiber hydrophone pickup arm optical fiber detector and method - Google Patents
A kind of interference type optical fiber hydrophone pickup arm optical fiber detector and method Download PDFInfo
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- CN107687939A CN107687939A CN201710755660.4A CN201710755660A CN107687939A CN 107687939 A CN107687939 A CN 107687939A CN 201710755660 A CN201710755660 A CN 201710755660A CN 107687939 A CN107687939 A CN 107687939A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/30—Testing of optical devices, constituted by fibre optics or optical waveguides
- G01M11/31—Testing of optical devices, constituted by fibre optics or optical waveguides with a light emitter and a light receiver being disposed at the same side of a fibre or waveguide end-face, e.g. reflectometers
- G01M11/3109—Reflectometers detecting the back-scattered light in the time-domain, e.g. OTDR
- G01M11/3118—Reflectometers detecting the back-scattered light in the time-domain, e.g. OTDR using coded light-pulse sequences
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
- G01H9/004—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors
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Abstract
A kind of interference type optical fiber hydrophone pickup arm optical fiber detector and method, belong to optical technical field, and the present invention is in order to solve the problems, such as the temperature strain distribution that can not measure Michelson interference structured optical fiber hydrophone pickup arm optical fiber at present.Fiber coupler receives the laser exported by laser, and through fiber coupler point, two-way, upper road are pump light to laser up and down, and lower road is detection light；The upper road output end of fiber coupler is connected with the input of the first electrooptic modulator, the electric pulse of first electrooptic modulator reception signal source output simultaneously, laser is changed into pulsed light after the modulation of the first electrooptic modulator and is input to scrambler, optical fiber circulator is input to after erbium-doped fiber amplifier amplifies again, interference type optical fiber hydrophone to be measured is input to finally by the first port of optical fiber circulator.A kind of interference type optical fiber hydrophone pickup arm optical fiber detector and method of the present invention can detect to the temperature strain distribution of Michelson interference structured optical fiber hydrophone pickup arm optical fiber.
Description
Technical field
The present invention relates to a kind of pickup arm optical fiber detector and method, and in particular to a kind of interference type optical fiber hydrophone passes
Feel arm optical fiber detector and method, belong to optical technical field.
Background technology
Fibre optic hydrophone is a kind of by highly sensitive optical coherence characteristic, and underwater or underground acoustical signal is changed into light letter
Number, then photoelectric conversion device extracts voice signal.Optical fiber is both to pass optical medium and sensor information in this kind of sensor, it
There are big high sensitivity, good frequency response, dynamic range, electromagnetism interference, long-distance transmissions and monitor on a large scale.Light
Fine hydrophone has been widely used for：The fields such as exploration of ocean resources, seabottom geology exploration, Homeland Security.
Michelson interference structured optical fiber hydrophone general principle is as shown in Figure 3：Laser divides behind fiber coupler port 1
For two-way, exported respectively from port 3 and port 4, this road of port 3 forms pickup arm, receives acoustical signal, this road of port 4 is as ginseng
Examine arm, the light in pickup arm is reflected after acoustical signal is modulated by speculum 1, is then exported by port 2, two exported by port 2
Arm reflected signal occurs to be concerned with, and interference signal is changed into electric signal after opto-electronic conversion, and information of acoustic wave, root are obtained after Electric signal processing
Identified according to information of acoustic wave, position underwater or underground object.But fibre optic hydrophone in real work by waters, the depth of water, hydraulic pressure
Influence to cause pickup arm optical fiber property to change etc. factor, cause the increase of hydrophone work noise, performance unstable.Therefore,
Need to monitor hydrophone pickup arm optical fiber on-line, it is different by specificity analysises such as distributed measurement pickup arm optic fibre force, temperature
The influences of the factor to hydrophone performance such as the optical fiber technique for coiling of fibre optic hydrophone, packaging technology, selection.
Fiber optic loop coiling girth is about 10cm, it is necessary to high spatial resolution, high accuracy, distributed light in fibre optic hydrophone
Fine sensing technology can just accurately reflect the stress distribution of optical fiber coiling one week.At present, a kind of scheme uses Brillouin light frequency domain
Analytical technology (Romeo Bernini, Aldo Minardo, Luigi Zeni, " Distributed sensing at
centimeter-scale spatial resolution by BOFDA:measurements and signal
processing,[J].Photonics Journal,2011,4:48-56), however the pump light that uses of the technology and detection light
All it is continuous light, due to the lasting reflection of fibre optic hydrophone pickup arm and reference arm speculum to two-beam, causes reflected light 2
It is concerned with after the output of port, the strong and weak of coherent signal rises and falls to the strong interference of Brillouin signal, system can not be measured pickup arm light
Fine strain and temperature.The continuous light and pulsed light that Chinese patent 201610249590.0 proposes are simultaneously from the incidence of optical fiber one end
Single-ended Brillouin is concerned with field technique, although avoiding both-end incidence, the use of continuous light can be still shone into interferometer structure
It is concerned with after being emitted after the lasting reflection of two speculums in the port of coupler 2, so as to which Michelson interference structured optical fiber can not be measured
The temperature strain distribution of hydrophone pickup arm optical fiber.
The content of the invention
It is an object of the invention to provide a kind of interference type optical fiber hydrophone pickup arm optical fiber detector and method, to solve
The problem of temperature strain distribution of Michelson interference structured optical fiber hydrophone pickup arm optical fiber can not be measured at present.
A kind of interference type optical fiber hydrophone pickup arm optical fiber detector include laser, fiber coupler,
First electrooptic modulator, signal source, erbium-doped fiber amplifier, optical fiber circulator, optical filter, photodetector, data are adopted
Storage, the second electrooptic modulator, microwave source and isolator；
The fiber coupler receives the laser exported by laser, and laser is through two-way above and below fiber coupler point, upper road
For pump light, lower road is detection light；The upper road output end of fiber coupler is connected with the input of the first electrooptic modulator, together
When the output of the first electrooptic modulator reception signal source electric pulse, to be changed into pulsed light defeated after the modulation of the first electrooptic modulator for laser
Enter to scrambler, then optical fiber circulator is input to after erbium-doped fiber amplifier amplifies, finally by the first of optical fiber circulator
Port is input to interference type optical fiber hydrophone to be measured；
The lower road output end of the fiber coupler is connected with the input of the second electrooptic modulator, while the second electric light
Modulator receives the microwave pulse of microwave source output, and laser is changed into detection light after the modulation of the second electrooptic modulator and is input to isolation
Device, interference type optical fiber hydrophone to be measured is input to after isolator is isolated, and the detection light is comprising a pair of lower sidebands
Impulse type detects light, and frequency is respectively υ ± f；
The detection light during optical fiber in interference type optical fiber hydrophone to be measured with pumping pulse generation excited Brillouin through dissipating
The effect of penetrating, first port of the detection light through optical fiber circulator after effect are input to optical fiber circulator, from the of optical fiber circulator
Two-port netwerk exports, the detection light of optical filter reception optical fiber circulator output, after filtering out a sideband by optical filter
Again data acquisition unit is connected to through photodetector.
Preferably：The lower road output end of the fiber coupler is connected with the input of the second electrooptic modulator, simultaneously
The microwave pulse that the frequency that second electrooptic modulator receives microwave source output is f, laser become after the modulation of the second electrooptic modulator
The 3rd electrooptic modulator is input to for detection light, and the detection light is that the impulse type comprising a pair of lower sidebands detects light, frequency
Rate is respectively υ ± f；3rd electrooptic modulator receives detection light and receives the electric pulse of clock output, and detection light is through the 3rd
It is changed into impulse type detection light after electrooptic modulator impulse modulation and is input to isolator, is input to after isolator is isolated to be measured dry
Relate to type fibre optic hydrophone；
Impulse type detection light with pumping pulse during optical fiber in interference type optical fiber hydrophone to be measured through being excited cloth
In deep scattering process, after effect impulse type detection first port of the light through optical fiber circulator be input to optical fiber circulator, from light
The second port output of fine circulator, the impulse type detection light of optical filter reception optical fiber circulator output, is filtered by optics
Ripple device is connected to data acquisition unit through photodetector again after filtering out a sideband.
Preferably：The coupling ratio of the fiber coupler is 80:20~50:50.
Preferably：First electrooptic modulator can be replaced the type semiconductor optical amplifier that opens the light.
Preferably：3rd electrooptic modulator is switch type semiconductor light amplifier.
Preferably：The fiber coupler receives the laser exported by laser, and laser is divided to upper and lower two through fiber coupler
Road, upper road are pump light, and lower road is detection light；The upper road output end and the input phase of the first electrooptic modulator of fiber coupler
Connection, while the electric pulse of the first electrooptic modulator reception signal source output, laser are changed into after the modulation of the first electrooptic modulator
Pulsed light is input to scrambler, then is input to optical fiber circulator after erbium-doped fiber amplifier amplifies, finally by fiber annular
The first port of device is input to interference type optical fiber hydrophone to be measured；
The lower road output end of the fiber coupler is connected with the input of the second electrooptic modulator, while the second electric light
Modulator receives the microwave pulse of microwave source output, and laser is changed into detection light after the modulation of the second electrooptic modulator and is input to optics
Wave filter, and the detection light is that the impulse type comprising a pair of lower sidebands detects light, frequency is respectively υ ± f, is filtered by optics
Ripple device is input to isolator after filtering out a sideband, and interference type optical fiber hydrophone to be measured is input to after isolator is isolated；
The detection light during optical fiber in interference type optical fiber hydrophone to be measured with pumping pulse generation excited Brillouin through dissipating
The effect of penetrating, first port of the detection light through optical fiber circulator after effect are input to optical fiber circulator, from the of optical fiber circulator
Two-port netwerk exports, and the detection light of photodetector reception optical fiber circulator output, is adopted after photodetector is converted to electric signal
Collect data acquisition unit.
Preferably：The lower road output end of the fiber coupler is connected with the input of the second electrooptic modulator, simultaneously
Second electrooptic modulator receives the electric pulse of clock output, and laser is changed into impulse type detection after the modulation of the second electrooptic modulator
Light is input to the 3rd electrooptic modulator, and the 3rd electrooptic modulator receives impulse type detection light and receives the frequency of microwave source output
For f microwave pulse, and the detection light detects light to include the impulse type of a pair of lower sidebands, and frequency is respectively υ ± f；Arteries and veins
Stamp detection light is input to isolator after the 3rd electrooptic modulator impulse modulation, and interference to be measured is input to after isolator is isolated
Type fibre optic hydrophone；
Impulse type detection light with pumping pulse during optical fiber in interference type optical fiber hydrophone to be measured through being excited cloth
In deep scattering process, after effect impulse type detection first port of the light through optical fiber circulator be input to optical fiber circulator, from light
The second port output of fine circulator, the impulse type detection light of optical filter reception optical fiber circulator output, is filtered by optics
Ripple device is connected to data acquisition unit through photodetector again after filtering out a sideband.
Based on the detection method of interference type optical fiber hydrophone pickup arm optical fiber detector, comprise the following steps：
Step 1, the laser of laser output are divided into two-way up and down after fiber coupler, and upper road is as pump light, lower road
As detection light, coupling ratio 50:50；
Step 2, the upper road laser of fiber coupler output are input to the first electrooptic modulator, signal source output electric pulse
It is loaded on the first electrooptic modulator, it is into pulsed light and then electric by first the continuous light modulation of the first electrooptic modulator is input to
Optical modulator output port exports, and the light pulse of the first electrooptic modulator output is input to scrambler, and the effect of scrambler is to disappear
Except polarization, multiple averaging then is done to the signal collected so as to eliminate signal fluctuation caused by polarization state in single-mode fiber, passed through
Light pulse after scrambler is input to erbium-doped fiber amplifier, amplified to be input to optical fiber circulator, optical fiber circulator it is defeated
Exported after inbound port input from its first port, the first port of optical fiber circulator is connected to interference type optical fiber hydrophone to be measured；
Step 3, the lower road laser of fiber coupler output are input to the second electrooptic modulator, the microwave of microwave source output
Pulse is loaded on the second electrooptic modulator, the light modulation to inciding the second electrooptic modulator, defeated by the second electrooptic modulator
The detection light gone out includes a pair of lower sidebands, and frequency is respectively υ ± f, and it is impulse type to detect light, and detection light is adjusted by the second electric light
Isolator is input to after device output processed, interference type optical fiber hydrophone to be measured is input to after isolator, through in fibre optic hydrophone
Stimulated Brillouin scattering effect occurs during optical fiber with pumping pulse；
Step 4, first port of the detection light through optical fiber circulator after effect injects optical fiber circulator, from fiber annular
The second port of device projects, and is then filtered out by optical filter and is changed into electric signal, telecommunications by photodetector after a sideband
Number the strain temperature distribution situation of fibre optic hydrophone pickup arm optical fiber is obtained by data collecting card collection analysis, complete optical fiber water and listen
The detection of the strain temperature distribution of device pickup arm optical fiber.
The present invention has the following effects that compared with existing product：1st, the impulse type detection light Brillouin light proposed in this patent
Time-domain analysis can provide the detection light and pump light of impulse type, avoid interference with type fibre optic hydrophone pickup arm and reference arm two is anti-
Penetrate lasting reflection of the mirror to continuous light and cause serious interference, so as to realize interference type optical fiber hydrophone pickup arm fibre strain temperature
Spend on-line checking；2nd, Electro-optical Modulation is loaded into using microwave pulse modulation in impulse type detection light Brillouin optical time domain analysis system
In device, so as to produce impulse type detection light, greatly reduce cost, simplify system；3rd, impulse type detection light Brillouin light time domain point
Microwave pulse width continuously adjustabe, microwave frequency continuously adjustabe in analysis system, should so as to provide the distribution of high spatial resolution
Become detection.
Brief description of the drawings
Fig. 1 is a kind of structural representation of interference type optical fiber hydrophone pickup arm optical fiber detector of the present invention；
Fig. 2 is the structural representation of embodiment two；
Fig. 3 is the structural representation of Michelson interference interference structure fibre optic hydrophone；
Fig. 4 is the power diagram that two-stage O_3-BAC produces impulse type detection light；
Fig. 5 is the structural representation of embodiment three；
Fig. 6 is the structural representation of embodiment two.
In figure：1- lasers, 2- fiber couplers, the electrooptic modulators of 3- first, 4- signal sources, 5- Erbium-doped fiber amplifiers
Device, 6- optical fiber circulators, 7- optical filters, 8- photodetectors, 9- data acquisition units, 10- interference-type optical fiber water to be measured are listened
Device, the electrooptic modulators of 11- second, 12- microwave sources, 13- isolators, the electrooptic modulators of 15- the 3rd, 16- clocks.
Embodiment
The preferred embodiment of the present invention is elaborated below according to accompanying drawing.
Embodiment 1：A kind of as shown in figure 1, interference type optical fiber hydrophone pickup arm optical fiber inspection of the present invention
Surveying device includes laser 1, fiber coupler 2, the first electrooptic modulator 3, signal source 4, erbium-doped fiber amplifier 5, light
Fine circulator 6, optical filter 7, photodetector 8, data acquisition unit 9, the second electrooptic modulator 11, microwave source 12 and isolation
Device 13；
The fiber coupler 2 receives the laser exported by laser 1, and laser divides two-way up and down through fiber coupler 2, on
Road is pump light, and lower road is detection light；The upper road output end of fiber coupler 2 is connected with the input of the first electrooptic modulator 3
Connect, while the electric pulse of the reception signal source 4 of the first electrooptic modulator 3 output, laser are changed into after the modulation of the first electrooptic modulator 3
Pulsed light is input to scrambler 20, then is input to optical fiber circulator 6 after the amplification of erbium-doped fiber amplifier 5, finally by optical fiber
The first port of circulator 6 is input to interference type optical fiber hydrophone 10 to be measured；
The lower road output end of the fiber coupler 2 is connected with the input of the second electrooptic modulator 11, while second
Electrooptic modulator 11 receives the microwave pulse that microwave source 12 exports, and laser is changed into detecting light after the modulation of the second electrooptic modulator 11
Isolator 13 is input to, interference type optical fiber hydrophone 10 to be measured is input to after the isolation of isolator 13, and the detection light is bag
Impulse type containing a pair of lower sidebands detects light, and frequency is respectively υ ± f；
The detection light with pumping pulse during optical fiber in interference type optical fiber hydrophone 10 to be measured through occurring excited Brillouin
Scattering process, first port of the detection light through optical fiber circulator 6 after effect is input to optical fiber circulator 6, from optical fiber circulator 6
Second port output, the reception optical fiber circulator 6 of optical filter 7 output detection light, filter out one by optical filter 7
Data acquisition unit 9 is connected to after sideband through photodetector 8 again.
Embodiment two：As shown in Figure 2 and Figure 6, the difference of present embodiment and embodiment one is, arteries and veins
Stamp detects light and produced by the secondary modulation of two electrooptic modulators, the lower road output end of the fiber coupler 2 and the second electricity
The input of optical modulator 11 is connected, while the second electrooptic modulator 11 receives the microwave that the frequency that microwave source 12 exports is f
Pulse, laser are changed into detection light after the modulation of the second electrooptic modulator 11 and are input to the 3rd electrooptic modulator 15, and the detection
Light is that the impulse type comprising a pair of lower sidebands detects light, and frequency is respectively υ ± f；3rd electrooptic modulator 15 receives detection light
And the electric pulse of the output of clock 16 is received, detection light is changed into impulse type detection after the impulse modulation of the 3rd electrooptic modulator 15
Light is simultaneously input to isolator 13, and interference type optical fiber hydrophone 10 to be measured is input to after the isolation of isolator 13；The microwave source 12
It can be exchanged with the position of clock 16.
The impulse type detection light during optical fiber in interference type optical fiber hydrophone 10 to be measured with pumping pulse through being excited
Brillouin scattering acts on, and impulse type detection first port of the light through optical fiber circulator 6 after effect is input to optical fiber circulator 6,
Export, the impulse type detection light of the reception optical fiber circulator 6 of optical filter 7 output, pass through from the second port of optical fiber circulator 6
Optical filter 7 is connected to data acquisition unit 9 through photodetector 8 again after filtering out a sideband, and which does not need impulse type
Microwave, microwave source is required to reduce.
Further：The coupling ratio of fiber coupler 2 is 80:20~50:50.
Further：First electrooptic modulator 3 can be replaced the type semiconductor optical amplifier that opens the light.
Further：3rd electrooptic modulator 15 is switch type semiconductor light amplifier.
Embodiment three：As shown in figure 5, the difference of present embodiment and embodiment one is, optics filter
Ripple device 7 is by between the second port of optical fiber circulator 6 and photodetector 8, changing to the second electrooptic modulator 11 and isolator
Between 13；The fiber coupler 2 receives the laser exported by laser 1, and laser divides two-way up and down through fiber coupler 2, on
Road is pump light, and lower road is detection light；The upper road output end of fiber coupler 2 is connected with the input of the first electrooptic modulator 3
Connect, while the electric pulse of the reception signal source 4 of the first electrooptic modulator 3 output, laser are changed into after the modulation of the first electrooptic modulator 3
Pulsed light is input to scrambler 20, then is input to optical fiber circulator 6 after the amplification of erbium-doped fiber amplifier 5, finally by optical fiber
The first port of circulator 6 is input to interference type optical fiber hydrophone 10 to be measured；
The lower road output end of the fiber coupler 2 is connected with the input of the second electrooptic modulator 11, while second
Electrooptic modulator 11 receives the microwave pulse that microwave source 12 exports, and laser is changed into detecting light after the modulation of the second electrooptic modulator 11
Be input to optical filter 7, and the detection light detects light to include the impulse type of a pair of lower sidebands, frequency be respectively υ ±
F, isolator 13 is input to after filtering out a sideband by optical filter 7, interference to be measured is input to after the isolation of isolator 13
Type fibre optic hydrophone 10；
The detection light with pumping pulse during optical fiber in interference type optical fiber hydrophone 10 to be measured through occurring excited Brillouin
Scattering process, first port of the detection light through optical fiber circulator 6 after effect is input to optical fiber circulator 6, from optical fiber circulator 6
Second port output, the reception optical fiber circulator 6 of photodetector 8 output detection light, be converted to telecommunications through photodetector 8
Data acquisition unit 9 is collected after number, which is easy to system control, directly can determine laser work by the transmitted light of wave filter
Make state.
Further：Based on the detection method of interference type optical fiber hydrophone pickup arm optical fiber detector, comprise the following steps：
Step 1, the laser that laser 1 exports are divided into two-way up and down after fiber coupler 2, upper road as pump light, under
Road is as detection light, coupling ratio 50:50；
Step 2, the upper road laser that fiber coupler 2 exports are input to the first electrooptic modulator 3, and signal source 4 exports electric arteries and veins
Punching is loaded on the first electrooptic modulator 3, being input to the continuous light modulation of the first electrooptic modulator 3 into pulsed light and then by the
The output port of one electrooptic modulator 3 exports, and the light pulse of the first electrooptic modulator 3 output is input to scrambler 20, scrambler 20
Effect be to eliminate polarization, multiple averaging then is done to the signal collected so as to eliminate in single-mode fiber letter caused by polarization state
Number rise and fall, the light pulse after scrambler 20 is input to erbium-doped fiber amplifier 5, amplified to be input to optical fiber circulator 6, light
Exported after the input port input of fine circulator 6 from its first port, the first port of optical fiber circulator 6 is connected to interference to be measured
Type fibre optic hydrophone 10；
Step 3, the lower road laser that fiber coupler 2 exports are input to the second electrooptic modulator 11, what microwave source 12 exported
Microwave pulse is loaded on the second electrooptic modulator 11, the light modulation to inciding the second electrooptic modulator 11, by the second electric light
Modulator 11 export detection light include a pair of lower sidebands, frequency is respectively υ ± f, and detect light be impulse type, detect light by
Isolator 13 is input to after the output of second electrooptic modulator 11, interference type optical fiber hydrophone to be measured is input to after isolator 13
10, through stimulated Brillouin scattering effect occurs during optical fiber in fibre optic hydrophone with pumping pulse；
Step 4, first port of the detection light through optical fiber circulator 6 after effect injects optical fiber circulator 6, from fiber optic loop
The second port of shape device 6 projects, and is then filtered out by optical filter 7 and is changed into electric signal by photodetector 8 after a sideband,
Electric signal obtains the strain temperature distribution situation of fibre optic hydrophone pickup arm optical fiber by data collecting card collection analysis, completes optical fiber
The detection of the strain temperature distribution of hydrophone pickup arm optical fiber.
Present embodiment is the exemplary illustration to this patent, does not limit its protection domain, people in the art
Member can also be changed to its part, as long as no the Spirit Essence beyond this patent, all in the protection domain of this patent.
Claims (8)
- A kind of 1. interference type optical fiber hydrophone pickup arm optical fiber detector, it is characterised in that：Including laser (1), optical fiber coupling Clutch (2), the first electrooptic modulator (3), signal source (4), erbium-doped fiber amplifier (5), optical fiber circulator (6), optically filtering Device (7), photodetector (8), data acquisition unit (9), the second electrooptic modulator (11), microwave source (12) and isolator (13)；The fiber coupler (2) receives the laser exported by laser (1), and laser divides two-way up and down through fiber coupler (2), Upper road is pump light, and lower road is detection light；The upper road output end of fiber coupler (2) and the input of the first electrooptic modulator (3) End is connected, while the electric pulse of the first electrooptic modulator (3) reception signal source (4) output, and laser is through the first electrooptic modulator (3) it is changed into pulsed light after modulating and is input to scrambler (20), then fiber annular is input to after erbium-doped fiber amplifier (5) amplification Device (6), interference type optical fiber hydrophone to be measured (10) is input to finally by the first port of optical fiber circulator (6)；The lower road output end of the fiber coupler (2) is connected with the input of the second electrooptic modulator (11), while second Electrooptic modulator (11) receives the microwave pulse of microwave source (12) output, and laser is changed into after the second electrooptic modulator (11) modulation Detection light is input to isolator (13), and interference type optical fiber hydrophone to be measured (10), and institute are input to after isolator (13) isolation It is that the impulse type comprising a pair of lower sidebands detects light to state detection light, and frequency is respectively υ ± f；The detection light during optical fiber in interference type optical fiber hydrophone to be measured (10) with pumping pulse generation excited Brillouin through dissipating The effect of penetrating, first port of the detection light through optical fiber circulator (6) after effect is input to optical fiber circulator (6), from fiber annular The second port output of device (6), the detection light of optical filter (7) reception optical fiber circulator (6) output, passes through optical filter (7) data acquisition unit (9) is connected to after filtering out a sideband through photodetector (8) again.
- A kind of 2. interference type optical fiber hydrophone pickup arm optical fiber detector according to claim 1, it is characterised in that：Institute The lower road output end for stating fiber coupler (2) is connected with the input of the second electrooptic modulator (11), while the second electric light is adjusted The microwave pulse that the frequency that device (11) processed receives microwave source (12) output is f, laser is after the second electrooptic modulator (11) modulation It is changed into detection light and is input to the 3rd electrooptic modulator (15), and the detection light is the impulse type detection for including a pair of lower sidebands Light, frequency are respectively υ ± f；3rd electrooptic modulator (15) receives detection light and receives the electric pulse of clock (16) output, Detection light is changed into impulse type detection light after the 3rd electrooptic modulator (15) impulse modulation and is input to isolator (13), through isolation Interference type optical fiber hydrophone to be measured (10) is input to after device (13) isolation；Impulse type detection light with pumping pulse during optical fiber in interference type optical fiber hydrophone to be measured (10) through being excited cloth In deep scattering process, after effect impulse type detection first port of the light through optical fiber circulator (6) be input to optical fiber circulator (6), exported from the second port of optical fiber circulator (6), the impulse type of optical filter (7) reception optical fiber circulator (6) output Light is detected, data acquisition unit (9) is connected to through photodetector (8) again after filtering out a sideband by optical filter (7).
- 3. a kind of interference type optical fiber hydrophone pickup arm optical fiber detector according to claim 1 or 2, its feature exist In：The coupling ratio of the fiber coupler (2) is 80:20~50:50.
- 4. a kind of interference type optical fiber hydrophone pickup arm optical fiber detector according to claim 1 or 2, its feature exist In：First electrooptic modulator (3) can be replaced the type semiconductor optical amplifier that opens the light.
- A kind of 5. interference type optical fiber hydrophone pickup arm optical fiber detector according to claim 2, it is characterised in that：Institute It is switch type semiconductor light amplifier to state the 3rd electrooptic modulator (15).
- A kind of 6. interference type optical fiber hydrophone pickup arm optical fiber detector according to claim 1, it is characterised in that：Institute State fiber coupler (2) and receive the laser exported by laser (1), through two-way above and below fiber coupler (2) point, upper road is laser Pump light, lower road are detection light；The upper road output end of fiber coupler (2) is connected with the input of the first electrooptic modulator (3) Connect, while the electric pulse of the first electrooptic modulator (3) reception signal source (4) output, laser are modulated through the first electrooptic modulator (3) After be changed into pulsed light and be input to scrambler (20), then be input to optical fiber circulator (6) after erbium-doped fiber amplifier (5) amplification, Interference type optical fiber hydrophone to be measured (10) is input to finally by the first port of optical fiber circulator (6)；The lower road output end of the fiber coupler (2) is connected with the input of the second electrooptic modulator (11), while second Electrooptic modulator (11) receives the microwave pulse of microwave source (12) output, and laser is changed into after the second electrooptic modulator (11) modulation Detection light is input to optical filter (7), and the detection light is that the impulse type comprising a pair of lower sidebands detects light, frequency point Not Wei υ ± f, be input to isolator (13) after filtering out a sideband by optical filter (7), through isolator (13) isolation after it is defeated Enter to interference type optical fiber hydrophone to be measured (10)；The detection light during optical fiber in interference type optical fiber hydrophone to be measured (10) with pumping pulse generation excited Brillouin through dissipating The effect of penetrating, first port of the detection light through optical fiber circulator (6) after effect is input to optical fiber circulator (6), from fiber annular The second port output of device (6), the detection light of photodetector (8) reception optical fiber circulator (6) output, through photodetector (8) data acquisition unit (9) is collected after being converted to electric signal.
- A kind of 7. interference type optical fiber hydrophone pickup arm optical fiber detector according to claim 2, it is characterised in that：Institute The lower road output end for stating fiber coupler (2) is connected with the input of the second electrooptic modulator (11), while the second electric light is adjusted Device (11) processed receives the electric pulse of clock (16) output, and laser is changed into impulse type after the second electrooptic modulator (11) modulation and visited Light-metering is input to the 3rd electrooptic modulator (15), and the 3rd electrooptic modulator (15) receives impulse type detection light and receives microwave source (12) frequency of output is f microwave pulse, and the detection light is that the impulse type comprising a pair of lower sidebands detects light, frequency Respectively υ ± f；Impulse type detection light is input to isolator (13) after the 3rd electrooptic modulator (15) impulse modulation, through isolation Interference type optical fiber hydrophone to be measured (10) is input to after device (13) isolation；Impulse type detection light with pumping pulse during optical fiber in interference type optical fiber hydrophone to be measured (10) through being excited cloth In deep scattering process, after effect impulse type detection first port of the light through optical fiber circulator (6) be input to optical fiber circulator (6), exported from the second port of optical fiber circulator (6), the impulse type of optical filter (7) reception optical fiber circulator (6) output Light is detected, data acquisition unit (9) is connected to through photodetector (8) again after filtering out a sideband by optical filter (7).
- 8. the detection method according to claim 1 based on interference type optical fiber hydrophone pickup arm optical fiber detector, its It is characterised by, comprises the following steps：Step 1, the laser of laser (1) output are divided into two-way up and down after fiber coupler (2), upper road as pump light, under Road is as detection light, coupling ratio 50:50；Step 2, the upper road laser of fiber coupler (2) output are input to the first electrooptic modulator (3), signal source (4) output electricity Pulse is loaded on the first electrooptic modulator (3), and the continuous light modulation for being input to the first electrooptic modulator (3) is right into pulsed light Exported afterwards by the first electrooptic modulator (3) output port, the light pulse of the first electrooptic modulator (3) output is input to scrambler (20), the effect of scrambler (20) is to eliminate polarization, then does multiple averaging to the signal collected so as to eliminate single-mode fiber Signal fluctuation caused by middle polarization state, the light pulse after scrambler (20) is input to erbium-doped fiber amplifier (5), amplified Optical fiber circulator (6) is input to, is exported after the input port input of optical fiber circulator (6) from its first port, optical fiber circulator (6) first port is connected to interference type optical fiber hydrophone to be measured (10)；Step 3, the lower road laser of fiber coupler (2) output are input to the second electrooptic modulator (11), microwave source (12) output Microwave pulse be loaded on the second electrooptic modulator (11), the light modulation to inciding the second electrooptic modulator (11), by The detection light of two electrooptic modulators (11) output includes a pair of lower sidebands, and frequency is respectively υ ± f, and it is impulse type to detect light, Detection light is input to isolator (13) after being exported by the second electrooptic modulator (11), and interference to be measured is input to after isolator (13) Type fibre optic hydrophone (10), through stimulated Brillouin scattering effect occurs during optical fiber in fibre optic hydrophone with pumping pulse；Step 4, first port of the detection light through optical fiber circulator (6) after effect injects optical fiber circulator (6), from fiber optic loop The second port of shape device (6) projects, and is then filtered out by optical filter (7) and is changed into by photodetector (8) after a sideband Electric signal, electric signal obtain the strain temperature distribution situation of fibre optic hydrophone pickup arm optical fiber by data collecting card collection analysis, Complete the detection of the strain temperature distribution of fibre optic hydrophone pickup arm optical fiber.
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