CN105136180A - Phase modulation type sensing device based on Brillouin phase shift - Google Patents
Phase modulation type sensing device based on Brillouin phase shift Download PDFInfo
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- CN105136180A CN105136180A CN201510543654.3A CN201510543654A CN105136180A CN 105136180 A CN105136180 A CN 105136180A CN 201510543654 A CN201510543654 A CN 201510543654A CN 105136180 A CN105136180 A CN 105136180A
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Abstract
The invention discloses a phase modulation type sensing device based on Brillouin phase shift, and the device enables a light carrier generated by a light source to be divided into two parts, wherein one part is externally modulated by an electric pulse to generate pulse pump light, and the other part is externally modulated by an electric light phase modulator to generate detection light and local light through a 10-12GHz microwave signal. The detection light and the pulse pump light interact with each other in a testing optical fiber, and then generate a 10-12GHz high-frequency signal with the local light through beat frequency, wherein the phase is directly demodulated by a 9-12GHz broadband quadrature demodulator, thereby avoiding advanced frequency shift, reducing the complexity and cost of the device, and improving the stability of the device.
Description
Technical field
The invention belongs to Distributed Optical Fiber Sensing Techniques field, be specifically related to a kind of design of the phase modulation-type sensing device based on Brillouin's phase shift.
Background technology
Distributed Optical Fiber Sensing Techniques based on brillouin effect obtains extensive research for many years, and the key of this technology is Brillouin shift in optical fiber and the temperature be applied on optical fiber and stress linear correlation.Usually, need a branch of pulse pump light to cause brillouin gain from one end input of optical fiber, the continuous probe light of another bundle frequency-adjustable inputs from the other end of optical fiber and scans brillouin gain interval, thus reconstruct brillouin gain spectrum.Before 2012, detection light is often based on directly modulation, and sensing is also all based on the measurement to brillouin gain spectrum, and device is simple and be easy to demodulation.The problem caused is in the sensing of long distance, due to pump light consumption thus there is non-local effect, the inaccuracy of demodulation can be increased in rear end in a fiber.The people such as J.Urricelqui in 2012 are proposed and utilize phase-modulation to detect light and carried out the method for temperature and stress sensing by the method for demodulation Brillouin phase spectrum instead of gain spectral.The common ground of these methods needs to carry out a fixing pre-shift frequency (about about 10GHz) to light signal, then utilizes a low frequency signal (0 ~ 2GHz) to go to scan brillouin gain district.Pre-shift frequency not only increases system complexity and system cost, and adds the instability of system.
Summary of the invention
The object of the invention is, in order to solve the higher and problem of the problem that stability is lower of distributing optical fiber sensing method complexity and cost in prior art, to propose a kind of phase modulation-type sensing device based on Brillouin's phase shift.
Technical scheme of the present invention is: a kind of phase modulation-type sensing device based on Brillouin's phase shift, it is characterized in that, comprise laser instrument, photo-coupler, Polarization Controller, electro-optic phase modulator, microwave signal generator, scrambler, the first Erbium-Doped Fiber Amplifier (EDFA), optoisolator, measuring fiber, acousto-optic modulator, pulse signal generator, the second Erbium-Doped Fiber Amplifier (EDFA), circulator, Bragg grating, photodetector, electric bandpass filter, quadrature demodulator and oscillograph;
The light carrier that laser instrument exports is divided into the first light carrier and the second light carrier by photo-coupler;
The microwave signal that microwave signal generator produces is divided into two-way, and a road transfers to electro-optic intensity modulator, and another road transfers to quadrature demodulator;
The microwave signal that first light carrier is produced by microwave signal generator after Polarization Controller, by electro-optic phase modulator external modulation, forms this flash of light preceding an earthquake and detection light; Detection light, after the polarization state rapid perturbations of scrambler and the optical signal amplification of the first Erbium-Doped Fiber Amplifier (EDFA), sends into measuring fiber by optoisolator;
The pulse signal that second light carrier is produced by pulse signal generator is by producing pulse pump light after acousto-optic modulator external modulation; Pulse pump light enters measuring fiber by optical circulator after the second Erbium-Doped Fiber Amplifier (EDFA) amplifies;
Detection light and pulse pump light interact in measuring fiber, and through the guiding transmission of circulator and the wavelength chooses of Bragg grating laggard enter photodetector, the output signal of photodetector is gathered by oscillograph and stores after the filtering of electric bandpass filter and the demodulation of quadrature demodulator, and can carry out off-lined signal process demodulation Brillouin phase spectrum further.
Preferably, photo-coupler is 50:50 photo-coupler.
Preferably, the microwave signal frequency that microwave signal generator produces is 10 ~ 12GHz.
Preferably, quadrature demodulator adopts demodulation scope to be the wide band quadrature demodulator of 9 ~ 12GHz.
The invention has the beneficial effects as follows:
(1) the present invention utilizes Brillouin's phase spectrum instead of gain spectral to carry out demodulation to temperature, can effectively overcome non-local effect.
(2) the present invention adopts broadband IQ demodulator to carry out Brillouin's phase shift demodulation, can effectively avoid pre-frequency displacement, reduce the complicacy of system.
Accompanying drawing explanation
Fig. 1 is a kind of phase modulation-type sensing device structural representation based on Brillouin's phase shift provided by the invention.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are further described.
The invention provides a kind of phase modulation-type sensing device based on Brillouin's phase shift, as shown in Figure 1, laser instrument 1, photo-coupler 2, Polarization Controller 3, electro-optic phase modulator 4, microwave signal generator 5, scrambler 6, first Erbium-Doped Fiber Amplifier (EDFA) 7, optoisolator 8, measuring fiber 9, acousto-optic modulator 10, pulse signal generator 11, second Erbium-Doped Fiber Amplifier (EDFA) 12, circulator 13, Bragg grating 14, photodetector 15, electric bandpass filter 16, quadrature demodulator 17 and oscillograph 18 is comprised.
The light carrier centre frequency that laser instrument 1 exports is f
l, this light carrier is divided into two parts by 50:50 coupling mechanism 2, is the first light carrier and the second light carrier.
The microwave signal that microwave signal generator 5 produces is divided into two-way, and a road transfers to electro-optic phase modulator 4, and another road transfers to quadrature demodulator 17.
The microwave signal that first light carrier is produced by microwave signal generator 5 after Polarization Controller 3, by electro-optic phase modulator 4 external modulation, forms this flash of light preceding an earthquake and detection light.The output signal frequency of microwave signal generator 5 is f
s(10 ~ 12GHz is adjustable).Wherein, detection light has two components, and its frequency is respectively f
l± f
s; This flash of light preceding an earthquake has one-component, and frequency is f
l.Detection light, after the polarization state rapid perturbations of scrambler 6 and the optical signal amplification of the first Erbium-Doped Fiber Amplifier (EDFA) 7, sends into measuring fiber 9 by optoisolator 8.
The pulse signal that second light carrier is produced by pulse signal generator 11 is by producing pulse pump light after acousto-optic modulator 10 external modulation.Pulse pump light enters measuring fiber 9 by optical circulator 13 after the second Erbium-Doped Fiber Amplifier (EDFA) 12 amplifies.
Detection light and pulse pump light interact measuring fiber 9 in, and through the guiding of circulator 13 transmit and the wavelength chooses of Bragg grating 14 laggard enter photodetector 15, the optical signal field strongly expressed formula of arrival photodetector 15 is:
Wherein E
land E
sbe respectively the complex amplitude of this flash of light preceding an earthquake and detection light, f
dfor the frequency detuning between detection light and Brillouin shift, g
sBS(f
d) be brillouin gain,
for Brillouin's phase shift.
The current expression that photodetector 15 exports is:
Wherein R
cfor the receiving sensitivity of photodetector.Brillouin's phase spectrum information is f by frequency
shigh frequency carrier carry.
Quadrature demodulator 17 adopts demodulation scope to be the wide band quadrature demodulator of 9 ~ 12GHz, its homophase carrier wave cos (2 π f produced
sand quadrature carrier sin (2 π f t)
st) respectively with I (f
s) be multiplied and filtering high fdrequency component, the I road obtained and Q road signal expression are as shown in formula (3):
After I road and Q road two paths of signals are gathered by oscillograph 18, can in the hope of Brillouin's phase spectrum by formula (4):
And then distance-frequency-phase three-dimensional plot can be built, just can solve optical fiber temperature everywhere and stress information by solving phase spectrum at optical fiber zero crossing everywhere.
Those of ordinary skill in the art will appreciate that, embodiment described here is to help reader understanding's principle of the present invention, should be understood to that protection scope of the present invention is not limited to so special statement and embodiment.Those of ordinary skill in the art can make various other various concrete distortion and combination of not departing from essence of the present invention according to these technology enlightenment disclosed by the invention, and these distortion and combination are still in protection scope of the present invention.
Claims (4)
1. the phase modulation-type sensing device based on Brillouin's phase shift, it is characterized in that, comprise laser instrument (1), photo-coupler (2), Polarization Controller (3), electro-optic phase modulator (4), microwave signal generator (5), scrambler (6), first Erbium-Doped Fiber Amplifier (EDFA) (7), optoisolator (8), measuring fiber (9), acousto-optic modulator (10), pulse signal generator (11), second Erbium-Doped Fiber Amplifier (EDFA) (12), circulator (13), Bragg grating (14), photodetector (15), electricity bandpass filter (16), quadrature demodulator (17) and oscillograph (18),
The light carrier that described laser instrument (1) exports is divided into the first light carrier and the second light carrier by photo-coupler (2);
The microwave signal that described microwave signal generator (5) produces is divided into two-way, and a road transfers to electro-optic phase modulator (4), and another road transfers to quadrature demodulator (17);
The microwave signal that described first light carrier is produced by microwave signal generator (5) after Polarization Controller (3), by electro-optic phase modulator (4) external modulation, forms this flash of light preceding an earthquake and detection light; Described detection light, after the polarization state rapid perturbations of scrambler (6) and the optical signal amplification of the first Erbium-Doped Fiber Amplifier (EDFA) (7), sends into measuring fiber (9) by optoisolator (8);
The pulse signal that described second light carrier is produced by pulse signal generator (11) is by producing pulse pump light after acousto-optic modulator (10) external modulation; Described pulse pump light enters measuring fiber (9) by optical circulator (13) after the second Erbium-Doped Fiber Amplifier (EDFA) (12) amplifies;
Described detection light and pulse pump light interact in measuring fiber (9), and through the guiding transmission of circulator (13) and the wavelength chooses of Bragg grating (14) laggard enter photodetector (15), the output signal of photodetector (15) is gathered by oscillograph (18) and stores after the filtering of electric bandpass filter (16) and the demodulation of quadrature demodulator (17), and carries out off-lined signal process demodulation Brillouin phase spectrum.
2. the phase modulation-type sensing device based on Brillouin's phase shift according to claim 1, is characterized in that, described photo-coupler (2) is 50:50 photo-coupler.
3. the phase modulation-type sensing device based on Brillouin's phase shift according to claim 1, is characterized in that, the microwave signal frequency that described microwave signal generator (5) produces is 10 ~ 12GHz.
4. the phase modulation-type sensing device based on Brillouin's phase shift according to claim 1, is characterized in that, described quadrature demodulator (17) adopts demodulation scope to be the wide band quadrature demodulator of 9 ~ 12GHz.
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Cited By (1)
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| CN109155500A (en) * | 2016-03-31 | 2019-01-04 | Ipg光子公司 | Utilize the ultrafast pulsed laser device system of strength pulse shape correction |
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| CN109155500B (en) * | 2016-03-31 | 2021-06-15 | Ipg光子公司 | Ultrafast pulse laser system using intensity pulse shape correction |
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Application publication date: 20151209 |