CN109856057A - Using tapered fiber as the liquid ingredient analysis device and method of medium - Google Patents

Using tapered fiber as the liquid ingredient analysis device and method of medium Download PDF

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Publication number
CN109856057A
CN109856057A CN201910147830.XA CN201910147830A CN109856057A CN 109856057 A CN109856057 A CN 109856057A CN 201910147830 A CN201910147830 A CN 201910147830A CN 109856057 A CN109856057 A CN 109856057A
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China
Prior art keywords
fiber
tapered fiber
light
modulator
erbium
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Pending
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CN201910147830.XA
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Chinese (zh)
Inventor
董永康
巴德欣
闫嘉亮
张晓沛
李惠
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Harbin Institute of Technology
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Harbin Institute of Technology
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Priority to CN201910147830.XA priority Critical patent/CN109856057A/en
Publication of CN109856057A publication Critical patent/CN109856057A/en
Pending legal-status Critical Current

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Abstract

Using tapered fiber as the liquid ingredient analysis device and method of medium, it is related to technical field of light detection.The present invention solves the problems, such as existing liquid ingredient analysis method there are resolution ratio low low with detection sensitivity.The waveform signal of waveform generator transmitting of the invention is sent to intensity modulator after microwave amplifier amplifies, intensity modulator carries out coding adjusting to the laser that laser emits using waveform signal, and modulated laser signal is sent to single-side belt electrooptic modulator as detection light all the way;Another way is sent to the second erbium-doped fiber amplifier as pump light;Tapered fiber is arranged in testing liquid;Pump light interacts in tapered fiber with detection light via stimulated Brillouin scattering effect, and the detection light after interaction is incident to the photosurface of detector, is sent to oscillograph after detector photoelectric conversion and is acquired.The present invention is suitable for detecting liquid component.

Description

Using tapered fiber as the liquid ingredient analysis device and method of medium
Technical field
The present invention relates to technical field of light detection.
Background technique
Distributed Optical Fiber Sensing Techniques have high sensitivity, distance sensing length, electromagnetism interference, it is corrosion-resistant and convenient for lay The advantage no etc. many traditional sensors.The technology utilizes optical fiber external physical quantity generally using single mode optical fiber as sensor fibre To the modulating action for transmitting light in optical fiber, by detecting the characteristic parameter (such as light intensity, polarization) of the light by sensor fibre come real Now to the measurement of optical fiber external physical quantity.Since light is limited in the inside of sensor fibre, existing distributing optical fiber sensing skill Art is difficult to realize the detection to liquid component.
Tapered fiber is a kind of novel Fibre Optical Sensor medium.The fine diameter of tapered fiber is several microns of even several hundred nanometers of amounts Grade, which enhance the evanscent fields transmitted in optical fiber, and light is enable to break through the limitation of covering, into transmitting in ambient enviroment.Light with The direct contact of external environment provides feasible approach for the detection of realization surrounding liquid ingredient.
It is existing to be based on Brillouin light time domain by distributed Brillouin's liquid ingredient analysis technology of medium of tapered fiber Analysis principle.The technology category Brillouin fiber optic sensing technology scope.Different testing liquids has different Brillouin shifts.It is logical Detection to liquid component to be measured can be realized by crossing measurement Brillouin shift.The spatial discrimination of Brillouin optical time domain analysis technology Rate is lower, generally meter level.This requires the length of tapered fiber must be at least meter level, and under the conditions of prior art, draw cone light Fine effective sensitive zones are generally centimetres, and the tapered fiber of meter level length is difficult to realize, and yield rate is extremely low, this significant limit The actual application ability of the technology is made.Moreover, this span for requiring fluid to be measured to be taken up space will also reach meter level, this limitation The detection sensitivity of the technology.
Summary of the invention
The present invention is that existing liquid ingredient analysis method is low there are spatial resolution and detection sensitivity is poor in order to solve Problem proposes a kind of using tapered fiber as the liquid ingredient analysis device and method of medium.
It is of the present invention using tapered fiber as the liquid ingredient analysis device of medium, which includes laser 1, intensity Modulator 2, single-side belt electrooptic modulator 3, microwave source 4, the first erbium-doped fiber amplifier 5, time delay optical fiber 6, tapered fiber 7, ring Row device 9, detector 10, oscillograph 11, the second erbium-doped fiber amplifier 12, microwave amplifier 13 and waveform generator 14;
The waveform signal that waveform generator 14 emits is sent to intensity modulator 2, intensity after the amplification of microwave amplifier 13 Modulator 2 carries out coded modulation to the laser that laser 1 emits using waveform signal, and modulated laser signal is all the way as spy It surveys light and is sent to single-side belt electrooptic modulator 3;Another way is sent to the second erbium-doped fiber amplifier 12 as pump light;
Single-side belt electrooptic modulator 3 carries out single sideband modulation to the road optical signal using the microwave signal that microwave source 4 is sent, The detection light with lower shift frequency is formed, the detection light with lower shift frequency is incident to delay light after the first erbium-doped fiber amplifier 5 Fibre 6 is delayed, and the detection light after the delay of time delay optical fiber 6, which reenters, is incident upon tapered fiber 7, and tapered fiber 7 is arranged in prepare liquid In body;
Second erbium-doped fiber amplifier 12 is injected by 1 port of circulator 9 after amplifying to pump light and is penetrated through No. 2 mouths Out to tapered fiber 7;It interacts in tapered fiber 7 by amplified pump light and the detection light after delay, forms one Stimulated Brillouin scattering occurs at relevant peaks for a relevant peaks, No. 2 mouths of the detection light through circulator 9 projected from tapered fiber 7 Enter, through circulator 9 No. 3 mouth is projected to the photosurface of detector 10, is sent to oscillograph after the photoelectric conversion of detector 10 11。
Further, microwave source 4 and waveform generator 14 replace with function generator.
Further, pulse-modulator, the arteries and veins are provided between the second erbium-doped fiber amplifier 12 and intensity modulator 2 The pump light that pulse modulator receiving intensity modulator 2 exports carries out impulse modulation, by the Laser emission after impulse modulation to second Erbium-doped fiber amplifier 12.
Using tapered fiber as the liquid ingredient analysis method of medium, the detailed process of this method are as follows:
Step 1: carrying out coded modulation to laser signal using waveform signal, the laser signal after coded modulation is divided into Two-way, upper road light is as detection light, and lower road light is as pump light;
Step 2: carrying out single sideband modulation to upper road optical signal using microwave, the detection light with lower shift frequency is obtained, is had The detection light of lower shift frequency is incident to time delay optical fiber 6 after the amplification of the first erbium-doped fiber amplifier 5, enters after the delay of time delay optical fiber 6 It is incident upon tapered fiber 7;
Lower road optical signal is by amplified No. 1 mouth for injecting circulator 9 of the second erbium-doped fiber amplifier 12, through circulator 9 No. 2 mouths are incident to tapered fiber 7 after projecting;
Step 3: the phase interaction in tapered fiber 7 of the detection light with lower shift frequency after amplified pump light and delay With, form a relevant peaks, at relevant peaks occur stimulated Brillouin scattering, from tapered fiber 7 project detection light by going in ring After No. 2 mouths of device 9 are incident, project from No. 3 mouths of circulator 9 to the photosurface of detector 10, after 10 photoelectric conversion of detector It is sent to oscillograph 11.Step 4: obtaining drawing cone light after carrying out denoising and demodulation to received electric signal to oscillograph 11 Brillouin shift in fibre at relevant peaks obtains liquid locating for tapered fiber according to the relationship of Brillouin shift and liquid component Ingredient.
The present invention detects the refractive index of liquid using the brillouin frequency in-migration of the stimulated Brillouin scattering signal in optical fiber.It is non- Tapered fiber light field and acoustic wavefield are bound in fibre core, the light field of tapered fiber and acoustic wavefield meeting and external influence, thus Perception is extraneous to be influenced, this influence can be embodied by the variation of Brillouin shift, thus can refractive index to liquid into Row detection.But the length of tapered fiber is generally shorter, the Brillouin zone of action of conventional Brillouin sensing means is compared It is long, it is difficult to obtain the high signal of signal-to-noise ratio at tapered fiber, can only drawn using the domain analysis of Brillouin's correlation (BOCDA) technology It bores and Brillouin's effect occurs at optical fiber, to obtain the signal compared with high s/n ratio, and achieve the effect that distributed sensing, significantly Improve sensing sensitivity.
Detailed description of the invention
Fig. 1 is of the present invention using tapered fiber as the functional block diagram of the liquid ingredient analysis device of medium.
Specific embodiment
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings and examples, how to apply to the present invention whereby Technological means solves technical problem, and the realization process for reaching relevant art effect can fully understand and implement.This Shen Please each feature in embodiment and embodiment, can be combined with each other under the premise of not colliding, be formed by technical solution It is within the scope of the present invention.
It with tapered fiber is to be situated between described in present embodiment specific embodiment 1: illustrate present embodiment below with reference to Fig. 1 The liquid ingredient analysis device of matter,
The device includes laser 1, intensity modulator 2, single-side belt electrooptic modulator 3, microwave source 4, the first Er-doped fiber It is amplifier 5, time delay optical fiber 6, tapered fiber 7, circulator 9, detector 10, oscillograph 11, the second erbium-doped fiber amplifier 12, micro- Twt amplifier 13 and waveform generator 14;
The waveform signal that waveform generator 14 emits is sent to intensity modulator 2, intensity after the amplification of microwave amplifier 13 Modulator 2 carries out coded modulation to the laser that laser 1 emits using waveform signal, and modulated laser signal is all the way as spy It surveys light and is sent to single-side belt electrooptic modulator 3;Another way is sent to the second erbium-doped fiber amplifier 12 as pump light;
Single-side belt electrooptic modulator 3 carries out single sideband modulation to the road optical signal using the microwave signal that microwave source 4 is sent, The detection light with lower shift frequency is formed, the detection light with lower shift frequency is incident to delay light after the first erbium-doped fiber amplifier 5 Fibre 6 is delayed, and the detection light after the delay of time delay optical fiber 6, which reenters, is incident upon tapered fiber 7, and tapered fiber 7 is arranged in prepare liquid In body;
Second erbium-doped fiber amplifier 12 is injected by 1 port of circulator 9 after amplifying to pump light and is penetrated through No. 2 mouths Out to tapered fiber 7;It interacts in tapered fiber 7 by amplified pump light and the detection light after delay, forms one Stimulated Brillouin scattering occurs at relevant peaks for a relevant peaks, No. 2 mouths of the detection light through circulator 9 projected from tapered fiber 7 Enter, through circulator 9 No. 3 mouth is projected to the photosurface of detector 10, is sent to oscillograph after the photoelectric conversion of detector 10 11。
Specific embodiment 2: present embodiment to described in embodiment one using tapered fiber as the liquid component of medium Detection device is described further, and the wavelength for the laser that laser 1 exports is the distributed feedback light that output wavelength is 1550nm Fibre laser.
Specific embodiment 3: present embodiment to described in embodiment one or two using tapered fiber as the liquid of medium Component detection apparatus is described further, and microwave source 4 and waveform generator 14 replace with function generator.
Specific embodiment 4: present embodiment to described in embodiment one or two using tapered fiber as the liquid of medium Component detection apparatus is described further, and is provided with impulse modulation between the second erbium-doped fiber amplifier 12 and intensity modulator 2 Device, the pulse-modulator receives pump light and carries out impulse modulation, by the Laser emission after impulse modulation to the second Er-doped fiber Amplifier 12.
Present embodiment, which carries out impulse modulation to pump light, can be improved the peak power of its effect, enhance signal-to-noise ratio.It draws The actual gain length for boring optical fiber is smaller, and the power requirement of pump light is higher, if being easy to cause to damage to optics using continuous light It is bad, and amplify can be easy to get higher peak power again after carrying out impulse modulation using pulse-modulator, obtain compared with High signal-to-noise ratio.
Specific embodiment 5: present embodiment to described in embodiment one using tapered fiber as the liquid component of medium Detection device is described further, and is provided with pulse-modulator between the second erbium-doped fiber amplifier 12 and intensity modulator 2, institute The pump light for stating the output of pulse-modulator receiving intensity modulator 2 carries out impulse modulation, extremely by the Laser emission after impulse modulation Second erbium-doped fiber amplifier 12.Specific embodiment 6: using tapered fiber as the liquid component of medium described in present embodiment Detection method, the detailed process of this method are as follows:
Step 1: carrying out coded modulation to laser signal using waveform signal, the laser signal after coded modulation is divided into Two-way, upper road light is as detection light, and lower road light is as pump light;
Step 2: carrying out single sideband modulation to upper road optical signal using microwave, the detection light with lower shift frequency is obtained, is had The detection light of lower shift frequency is incident to time delay optical fiber 6 after the amplification of the first erbium-doped fiber amplifier 5, enters after the delay of time delay optical fiber 6 It is incident upon tapered fiber 7;
Lower road optical signal is by amplified No. 1 mouth for injecting circulator 9 of the second erbium-doped fiber amplifier 12, through circulator 9 No. 2 mouths are incident to tapered fiber 7 after projecting;
Step 3: the phase interaction in tapered fiber 7 of the detection light with lower shift frequency after amplified pump light and delay With, form a relevant peaks, at relevant peaks occur stimulated Brillouin scattering, from tapered fiber 7 project detection light by going in ring After No. 2 mouths of device 9 are incident, project from No. 3 mouths of circulator 9 to the photosurface of detector 10, after 10 photoelectric conversion of detector It is sent to oscillograph 11.
Step 4: related in acquisition tapered fiber after oscillograph 11 is carried out denoising and demodulated to received electric signal Brillouin shift at peak obtains the ingredient of liquid locating for tapered fiber according to the relationship of Brillouin shift and liquid component.
The present invention uses the Brillouin light domain of dependence analytical technology based on intensity modulated.The technology highest spatial resolution can Up to 2mm.Effective sensing length of the tapered fiber of this technical requirements is not less than 2mm, and this greatly reduces tapered fibers Drawing process, the functionization for significantly improving the technology is horizontal.On the other hand, since the method for the invention is able to detect liquid The spatial extent of body is grade, this improves sensing sensitivity significantly.The pass of the Brillouin shift and liquid component System is established by the measuring to known component liquids.
Although disclosed herein embodiment it is as above, the content is only to facilitate understanding the present invention and adopting Embodiment is not intended to limit the invention.Any those skilled in the art to which this invention pertains are not departing from this Under the premise of the disclosed spirit and scope of invention, any modification and change can be made in the implementing form and in details, But scope of patent protection of the invention, still should be subject to the scope of the claims as defined in the appended claims.

Claims (6)

1. using tapered fiber as the liquid ingredient analysis device of medium, which is characterized in that the device includes laser (1), intensity Modulator (2), microwave source (4), the first erbium-doped fiber amplifier (5), time delay optical fiber (6), is drawn single-side belt electrooptic modulator (3) Bore optical fiber (7), circulator (9), detector (10), oscillograph (11), the second erbium-doped fiber amplifier (12), microwave amplifier (13) and waveform generator (14);
The waveform signal of waveform generator (14) transmitting is sent to intensity modulator (2) after microwave amplifier (13) amplification, by force Degree modulator (2) carries out coded modulation to the laser that laser (1) emits using waveform signal, and modulated laser signal is all the way Single-side belt electrooptic modulator (3) are sent to as detection light;Another way is sent to the second erbium-doped fiber amplifier as pump light (12);
Single-side belt electrooptic modulator (3) carries out single sideband modulation to the road optical signal using the microwave signal that microwave source (4) is sent, The detection light with lower shift frequency is formed, the detection light with lower shift frequency is incident to delay after the first erbium-doped fiber amplifier (5) Optical fiber (6) is delayed, and the detection light after time delay optical fiber (6) delay, which reenters, to be incident upon tapered fiber (7), and tapered fiber (7) is set It sets in testing liquid;
Second erbium-doped fiber amplifier (12) is injected by 1 port of circulator (9) after amplifying to pump light and is penetrated through No. 2 mouths Out to tapered fiber (7);Detection light after amplified pump light and delay interacts in tapered fiber (7), shape At a relevant peaks, stimulated Brillouin scattering occurs at relevant peaks, the detection light projected from tapered fiber (7) is through circulator (9) No. 2 mouths enter, and No. 3 mouths through circulator (9) are projected to the photosurface of detector (10), and the photoelectricity through detector (10) turns Oscillograph (11) are sent to after changing.
2. according to claim 1 using tapered fiber as the liquid ingredient analysis device of medium, which is characterized in that laser (1) use output wavelength for the distributed feedback optical fiber laser of 1550nm.
3. according to claim 1 or 2 using tapered fiber as the liquid ingredient analysis device of medium, which is characterized in that micro- Wave source (4) and waveform generator (14) replace with function generator.
4. according to claim 1 or 2 using tapered fiber as the liquid ingredient analysis device of medium, which is characterized in that the Pulse-modulator is provided between two erbium-doped fiber amplifiers (12) and intensity modulator (2), the pulse-modulator receives strong The pump light for spending modulator (2) output carries out impulse modulation, by the Laser emission after impulse modulation to the second Erbium-doped fiber amplifier Device (12).
5. according to claim 1 using tapered fiber as the liquid ingredient analysis device of medium, which is characterized in that second mixes Pulse-modulator, the pulse-modulator receiving intensity tune are provided between doped fiber amplifier (12) and intensity modulator (2) The pump light of device (2) output processed carries out impulse modulation, by the Laser emission after impulse modulation to the second erbium-doped fiber amplifier (12)。
6. using tapered fiber as the liquid ingredient analysis method of medium, which is characterized in that the detailed process of this method are as follows:
Step 1: carrying out coded modulation to laser signal using waveform signal, the laser signal after coded modulation is divided into two-way, Upper road light is as detection light, and lower road light is as pump light;
Step 2: carrying out single sideband modulation to upper road optical signal using microwave, the detection light with lower shift frequency is obtained, has and moves down The detection light of frequency is incident to time delay optical fiber (6) after the first erbium-doped fiber amplifier (5) amplify, after time delay optical fiber (6) delay It is incident to tapered fiber (7);
Lower road optical signal is by the second erbium-doped fiber amplifier (12) amplified No. 1 mouth for injecting circulator (9), through circulator (9) No. 2 mouths are incident to tapered fiber (7) after projecting;
Step 3: the interaction in tapered fiber (7) of the detection light with lower shift frequency after amplified pump light and delay, A relevant peaks are formed, stimulated Brillouin scattering occurs at relevant peaks, the detection light projected from tapered fiber (7) is by circulator (9) it after No. 2 mouths are incident, projects from No. 3 mouths of circulator (9) to the photosurface of detector (10), through detector (10) photoelectricity Oscillograph (11) are sent to after conversion.
Step 4: obtaining relevant peaks in tapered fiber after carrying out denoising and demodulation to received electric signal to oscillograph (11) The Brillouin shift at place obtains the ingredient of liquid locating for tapered fiber according to the relationship of Brillouin shift and liquid component.
CN201910147830.XA 2019-02-27 2019-02-27 Using tapered fiber as the liquid ingredient analysis device and method of medium Pending CN109856057A (en)

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