CN106525098B - Eliminating light amplification leads to the system and method for coded pulse luminous power unevenness phenomenon - Google Patents
Eliminating light amplification leads to the system and method for coded pulse luminous power unevenness phenomenon Download PDFInfo
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- CN106525098B CN106525098B CN201611089111.XA CN201611089111A CN106525098B CN 106525098 B CN106525098 B CN 106525098B CN 201611089111 A CN201611089111 A CN 201611089111A CN 106525098 B CN106525098 B CN 106525098B
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000003321 amplification Effects 0.000 title claims abstract description 17
- 238000003199 nucleic acid amplification method Methods 0.000 title claims abstract description 17
- 230000010287 polarization Effects 0.000 claims abstract description 22
- 239000000835 fiber Substances 0.000 claims abstract description 16
- 230000003287 optical effect Effects 0.000 claims description 21
- 210000001367 artery Anatomy 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 210000003462 vein Anatomy 0.000 claims description 3
- 239000013307 optical fiber Substances 0.000 description 9
- 238000010586 diagram Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 238000007796 conventional method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000002123 temporal effect Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/36—Forming the light into pulses
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- General Physics & Mathematics (AREA)
- Lasers (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
The invention discloses eliminating light amplification to lead to the system and method for coded pulse luminous power unevenness phenomenon, which includes pulse signal generator, first laser device, the first Polarization Controller, the first electrooptic modulator, second laser, the second Polarization Controller, the second electrooptic modulator, coupler, erbium-doped fiber amplifier, dc-couple detector and oscillograph.Present invention employs the methods for the preceding pulse light for adding a different wave length before coded pulse, so that the coded pulse light after amplification is not distorted, eliminate coded pulse luminous power unevenness phenomenon.
Description
Technical field
The invention belongs to technical field of optical fiber sensing, more particularly to elimination light amplification causes coded pulse luminous power uneven
The system and method for smooth phenomenon.
Background technology
Optical fiber sensing technology is the brand-new technology developed from the 1970s, with the reality of optical fiber
With the development changed with optical communication technique, optical fiber sensing technology is grown rapidly with the posture of diversification.When light transmits in a fiber,
Since optical fiber is influenced by environmental factors such as external disturbance, temperature, strain, displacements, polarization state, power, wavelength, the phase of optical signal
The parameters such as position can change.Pass through these parameters of light in detection fiber, so that it may which the variation to obtain optical fiber ambient enviroment is believed
Breath, to realize sensing.
The study found that the direct impulse light of fibre optical sensor is modulated using certain patterns in communication, and according to one
Definite decoding rule is handled, and the measurement effect of sensor can be improved.It is washed off and is being passed with simple venation using coded sequence pulsed light
Spatial resolution obtained in sensing system is identical, and can greatly improve the signal-to-noise ratio of signal, does not change signal at any time
Variation tendency.As it can be seen that Fibre Optical Sensor system can be improved under the premise of not reducing spatial resolution using coded sequence pulsed light
The signal-to-noise ratio of system makes system obtain big dynamic range.
However, since image intensifer is there are temporal effect, coded pulse is power is no longer after image intensifer amplification
Flat, this can cause decoding result wrong, can not obtain the correct information along optical fiber.At present probably this is solved there are three types of method
The shortcomings that one problem, first method are that continuous light is first carried out coded pulse modulation again after EDFA amplifies, this method be
Limit the peak power of pulsed light.Second method is to increase the duty ratio of coded pulse, weakens temporal effect, this method
The shortcomings that be that cannot completely eliminate temporal effect.The third method is the amplified each coded pulse power of detection, when decoding with
The shortcomings that actual power size ratio is decoded instead of original encoding, this method is that experimentation is complex, and needs weight
It is new to derive decoding formula.
Invention content
In order to solve the technical issues of above-mentioned background technology proposes, the present invention is intended to provide eliminating light amplification causes to encode arteries and veins
The system and method for washing power unevenness phenomenon off, can solve coded pulse by image intensifer amplification after power no longer
Flat problem, and overcome the defect of existing solution.
In order to achieve the above technical purposes, the technical scheme is that：
Eliminating light amplification leads to the system of coded pulse luminous power unevenness phenomenon, it is characterised in that：Including pulse signal
Generator, first laser device, the first Polarization Controller, the first electrooptic modulator, second laser, the second Polarization Controller,
Two electrooptic modulators, coupler, erbium-doped fiber amplifier, dc-couple detector and oscillograph；The output end of first laser device
The output end of the input terminal, the first Polarization Controller that connect the first Polarization Controller connects the input terminal of the first electrooptic modulator,
The output end of second laser connects the input terminal of the second Polarization Controller, the second electricity of output end connection of the second Polarization Controller
The input terminal of optical modulator, the output end of pulse signal generator connect the defeated of the first electrooptic modulator and the second electrooptic modulator
Enter to hold, the input terminal of the output end connection coupler of the first electrooptic modulator and the second electrooptic modulator, the output end of coupler
The input terminal of erbium-doped fiber amplifier is connected, the output end of erbium-doped fiber amplifier connects the input terminal of dc-couple detector,
The input terminal of the output end connection oscillograph of dc-couple detector.
Further, described when first laser device is polarization-maintaining output, the first electrooptic modulator is polarization-maintaining input, second laser
When device is polarization-maintaining output and the second electrooptic modulator is polarization-maintaining input, the first Polarization Controller and the second Polarization Controller are omitted,
The output end of first laser device is directly connected to the input terminal of the first electrooptic modulator, and the output end of second laser is directly connected to
The input terminal of two electrooptic modulators.
Eliminating light amplification leads to the method for coded pulse luminous power unevenness phenomenon, includes the following steps：
(1) it utilizes pulse signal generator to generate two-way pulse, is all the way coded pulse, another way is preceding pulse, preceding
Pulse encoded in advance pulse Δ T in sequential is set, the width of preceding pulse is T, and first laser device and second laser produce respectively
Raw wavelength difference, the continuous light of the identical two-way of power, the continuous light of this two-way carry out coded pulse tune after Polarization Controller respectively
System and preceding pulse modulation, obtain coded pulse light and preceding pulse light；
(2) coded pulse light and preceding pulse light that step (1) obtains are coupled, the optical signal after coupling is carried out
Amplification receives amplified optical signal with dc-couple detector, the power of optical signal is observed with oscillograph；
(3) interval delta T of preceding pulse and coded pulse, and the power results constantly regulate for passing through observation oscilloscope are set
Preceding pulse width at this time is determined as final preposition until observe that the power of optical signal is flat by preceding pulse width T
Pulse width；
Further, under the premise of in the scattered signal of preceding pulse on coded pulse without influence, in step (1), the
The continuous light of two-way that one laser and second laser generate, their wavelength are identical or different.
The advantageous effect brought using above-mentioned technical proposal：
Preceding pulse light is added the certain time before coded pulse light in the present invention, and image intensifer is preceding when being amplified
The high level particle accumulated for a long time in image intensifer can be consumed by setting pulsed light, and each symbol of efficient coding pulsed light is made to obtain
Gain constant, to eliminate uneven phenomenon.In addition, compared with existing solution, the present invention simply easily realizes.
Description of the drawings
Fig. 1 is the system composition schematic diagram of the present invention.
Fig. 2 is the system composition schematic diagram that the present invention is applied to Fibre Optical Sensor.
Fig. 3 is to be not added with the result schematic diagram before preceding pulse is amplified coded pulse.
Fig. 4 is to be not added with the result schematic diagram after preceding pulse is amplified coded pulse.
Fig. 5 is the result schematic diagram before being amplified to coded pulse using the present invention.
Fig. 6 is the result schematic diagram after being amplified to coded pulse using the present invention.
Fig. 7 is using the present invention and the Comparative result schematic diagram for being not added with the progress Fibre Optical Sensor measurement of preceding pulse method.
Specific implementation mode
Below with reference to attached drawing, technical scheme of the present invention is described in detail.
The present invention, which devises a kind of elimination light amplification, leads to the system and method for coded pulse luminous power unevenness phenomenon.?
In the present embodiment, apply the present invention in Fibre Optical Sensor, steps are as follows：
Step 1：Using system as shown in Figure 1, two-way pulse is generated using pulse signal generator, is all the way coding arteries and veins
Punching, another way are preceding pulse, and the width of preceding pulse encoded in advance pulse Δ T in sequential, preceding pulse are T, laser 1
, power identical two-way continuous light different with the difference generation wavelength of laser 2, the continuous light of this two-way is respectively after Polarization Controller
Coded pulse modulation and preceding pulse modulation are carried out, coded pulse light and preceding pulse light are obtained.In the present embodiment, it uses
Golay complementary series is 64 as coding, pulsewidth 20ns, duty ratio 10%, code length.
Step 2：Coded pulse light and preceding pulse light that step 1 obtains are coupled, by the optical signal after coupling into
Row amplification receives amplified optical signal with dc-couple detector, the power of optical signal is observed with oscillograph.
Step 3：The interval delta T of preceding pulse and coded pulse is set, and continuous by the power results of observation oscilloscope
Preceding pulse width T is adjusted, until observing that the power of optical signal is flat, preceding pulse width at this time is determined as final
Preceding pulse width.
For different image intensifers and different pulse photoperiods, the interval delta T of preceding pulse and coded pulse and before
Pulse width T needs are set to be adjusted correspondingly.In the present embodiment, set the interval delta T of preceding pulse and coded pulse as
30us, preceding pulse width T are 3.2us.
Step 4：Amplified light pulse is input at Δ T, T that step 3 determines using system as shown in Figure 2
In optical fiber, fiber lengths are about 1540m, since preceding pulse and the difference on the frequency of coded pulse are very big, when frequency sweep, preceding pulse
Brillouin scattering signal can't have an impact the scattered signal of coded pulse.
Fig. 3-Fig. 6 compared the effect for the coded pulse that the present invention is generated with conventional method, the coding that conventional method generates
Light pulse maximum power difference is 1.59dB, and the coded light pulses maximum power difference that this method generates is only 0.16dB.Fig. 7 is compared
The present invention is used for the result that Fibre Optical Sensor measures with the coded pulse that conventional method generates.It can be seen from the figure that using this
The coded light pulses that method generates are used for sensing measurement, and the temperature measured is more accurate, and uncertainty of measurement is lower, only
0.2MHz, the coded light pulses that conventional method generates are for sensing measurement, the Brillouin shift and reality of optical fiber at the heating measured
Actual value deviation is larger, smaller than actual value 2MHz.
Above example is merely illustrative of the invention's technical idea, and protection scope of the present invention cannot be limited with this, every
According to technological thought proposed by the present invention, any change done on the basis of technical solution each falls within the scope of the present invention
Within.
Claims (4)
1. eliminating light amplification leads to the system of coded pulse luminous power unevenness phenomenon, it is characterised in that：It is sent out including pulse signal
Raw device, first laser device, the first Polarization Controller, the first electrooptic modulator, second laser, the second Polarization Controller, second
Electrooptic modulator, coupler, erbium-doped fiber amplifier, dc-couple detector and oscillograph；The output end of first laser device connects
The input terminal of the first Polarization Controller is connect, the output end of the first Polarization Controller connects the input terminal of the first electrooptic modulator, the
The output end of dual-laser device connects the input terminal of the second Polarization Controller, and the output end of the second Polarization Controller connects the second electric light
The input terminal of modulator, the input of output end connection the first electrooptic modulator and the second electrooptic modulator of pulse signal generator
The input terminal of the output end connection coupler of end, the first electrooptic modulator and the second electrooptic modulator, the output end of coupler connect
The input terminal of erbium-doped fiber amplifier is connect, the output end of erbium-doped fiber amplifier connects the input terminal of dc-couple detector, directly
Flow the input terminal of the output end connection oscillograph of coupled detector.
The system of coded pulse luminous power unevenness phenomenon, feature is caused to exist 2. eliminating light amplification according to claim 1
In：When first laser device is polarization-maintaining output, the first electrooptic modulator is polarization-maintaining input, second laser is polarization-maintaining output and second
When electrooptic modulator is that polarization-maintaining inputs, the first Polarization Controller and the second Polarization Controller, the output end of first laser device are omitted
It is directly connected to the input terminal of the first electrooptic modulator, the output end of second laser is directly connected to the input of the second electrooptic modulator
End.
3. eliminating light amplification leads to the method for coded pulse luminous power unevenness phenomenon, which is characterized in that include the following steps：
(1) it utilizes pulse signal generator to generate two-way pulse, is all the way coded pulse, another way is preceding pulse, preposition arteries and veins
It is punched in encoded in advance pulse Δ T in sequential, the width of preceding pulse is T, and first laser device and second laser generate wave respectively
Long different, the continuous light of the identical two-way of power, the continuous light of this two-way carried out after Polarization Controller respectively coded pulse modulation and
Preceding pulse is modulated, and coded pulse light and preceding pulse light are obtained；
(2) coded pulse light and preceding pulse light that step (1) obtains are coupled, the optical signal after coupling is put
Greatly, amplified optical signal is received with dc-couple detector, the power of optical signal is observed with oscillograph；
(3) interval delta T of preceding pulse and coded pulse is set, and preposition by the power results constantly regulate of observation oscilloscope
Preceding pulse width at this time is determined as final preceding pulse by pulse width T until observing that the power of optical signal is flat
Width.
The method of coded pulse luminous power unevenness phenomenon, feature is caused to exist 4. eliminating light amplification according to claim 3
In：The scattered signal of preceding pulse on the scattered signal of coded pulse without influence under the premise of, in step (1), first swash
The continuous light of two-way that light device and second laser generate, their wavelength are identical or different.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101476948A (en) * | 2008-12-19 | 2009-07-08 | 南京大学 | Long-distance optical fiber sensing method based on Hadamard matrix self-correlated characteristic |
| CN101764646A (en) * | 2008-12-24 | 2010-06-30 | 中国科学院半导体研究所 | Wavelength-encoding optical time domain reflection test device and measurement method thereof |
| CN203376078U (en) * | 2013-05-14 | 2014-01-01 | 威海北洋电气集团股份有限公司 | Gray code distributed fiber temperature sensor and temperature measurement system |
| CN105241390A (en) * | 2015-10-21 | 2016-01-13 | 吉林大学 | Rapid Brillouin optical-time domain analysis type strain measuring device and data processing method |
| CN105675031A (en) * | 2016-01-23 | 2016-06-15 | 中国人民解放军国防科学技术大学 | Pre-pumped pulse and Gray code based BOTDA (Brillouin Optical Time Domain Analysis) instrument |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2829591B2 (en) * | 1996-07-03 | 1998-11-25 | 株式会社京三製作所 | Train type information transmission device |
| JP2009156718A (en) * | 2007-12-27 | 2009-07-16 | Yokogawa Electric Corp | Optical pulse testing device |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101476948A (en) * | 2008-12-19 | 2009-07-08 | 南京大学 | Long-distance optical fiber sensing method based on Hadamard matrix self-correlated characteristic |
| CN101764646A (en) * | 2008-12-24 | 2010-06-30 | 中国科学院半导体研究所 | Wavelength-encoding optical time domain reflection test device and measurement method thereof |
| CN203376078U (en) * | 2013-05-14 | 2014-01-01 | 威海北洋电气集团股份有限公司 | Gray code distributed fiber temperature sensor and temperature measurement system |
| CN105241390A (en) * | 2015-10-21 | 2016-01-13 | 吉林大学 | Rapid Brillouin optical-time domain analysis type strain measuring device and data processing method |
| CN105675031A (en) * | 2016-01-23 | 2016-06-15 | 中国人民解放军国防科学技术大学 | Pre-pumped pulse and Gray code based BOTDA (Brillouin Optical Time Domain Analysis) instrument |
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