CN110161295A - A kind of probe and its Method of Adjustment of reflection type optical fiber electric-field sensor - Google Patents
A kind of probe and its Method of Adjustment of reflection type optical fiber electric-field sensor Download PDFInfo
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- CN110161295A CN110161295A CN201910364717.7A CN201910364717A CN110161295A CN 110161295 A CN110161295 A CN 110161295A CN 201910364717 A CN201910364717 A CN 201910364717A CN 110161295 A CN110161295 A CN 110161295A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/24—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices
- G01R15/241—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices using electro-optical modulators, e.g. electro-absorption
- G01R15/242—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices using electro-optical modulators, e.g. electro-absorption based on the Pockels effect, i.e. linear electro-optic effect
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Abstract
The invention discloses the probes and its Method of Adjustment of a kind of reflection type optical fiber electric-field sensor, belong to electromagnetic field measurements field, reflection type optical fiber electric-field sensor includes laser, polarization maintaining optical fibre, three port circulators and photodetector, polarization maintaining optical fibre is accessed from the first port of three port circulators, and photodetector is set to the third port of three port circulators；Probe includes: fixed device, has groove structure, is fixed with the polarizing film being sequentially arranged, lithium columbate crystal, 1/8 wave plate and reflector plate in groove structure；And quartz socket tube, one end are inserted with collimation lens, the other end is encapsulated with quartz cylinder, and fixed device is fixed in the middle part of quartz socket tube, and collimation lens connects the second port of three port circulators.The adjustment for solving the problems, such as sonde configuration in reflection type optical fiber electric-field sensor reduces the adverse effect of each element defect generation itself, realizes that each element relative position optimizes, improves measurement sensitivity and stability.
Description
Technical field
The present invention relates to electromagnetic field measurements fields, specifically, being related to a kind of probe of reflection type optical fiber electric-field sensor
And its Method of Adjustment.
Background technique
With the continuous increase of electric system transmission line capability, the continuous improvement of voltage class is transmitted, long distance power transmission is continuous
Increase, therefore the measurement accuracy of operating voltage is required also higher and higher.Current existing voltage sensor includes electromagnetic type electricity
Pressure sensor, capacitive battery pressure sensor and optical voltage sensor.Using at present most extensive, technology relative maturity is preceding two
Kind, but since volume is excessive, the reasons such as insulating properties complexity are not able to satisfy growing voltage measurement requirement.Optical voltage passes
Sensor is due to its good insulating, the factors, the increasingly favor by various countries' researcher such as encapsulation volume is small.
Electric field measurement includes the measurement of a variety of physical quantitys such as electric current, voltage, for measuring the electric field sensor of optic fibre of voltage
It is optical fibre voltage sensor.The optical fibre voltage sensors for measuring electric field most of at present are all based on linear electro-optic effect
Transmission-type structure, including polarizing film, electro-optic crystal and quarter-wave plate.A kind of traditional transmission-type electric field sensor of optic fibre knot
Structure is as shown in Figure 1.
The Chinese patent literature that publication No. is CN106093599A discloses a kind of optic probe and electromagnetic field measurements equipment
And their measurement method, it pops one's head according to collimator, the polarizer, quartz wave-plate, electro-optic crystal and high reflectance dieelctric sheet
Sequence is successively assembled in quartz glass tube, and incident optical is connected to collimator and is fixed on glass tube wall.It is this reflective
Optic probe has many advantages, such as that small in size, integrated level is high, small to the tested interference of electromagnetic field, but still has a big problem at present,
It is that stability is poor, how improves stability, can starts with from special Method of Adjustment.
Transmission-type electric field sensor of optic fibre sonde configuration incidence needs to connect light source, and outgoing needs to connect photodetector and data
Equipment is acquired, both ends, which will connect equipment, causes flexibility to reduce, and is unfavorable for detecting the electric field of small space.Compared to transmission-type,
Optical element needed for reflective probe is less, and integrated level is higher, and because using catoptric arrangement, the electro-optic crystal of equal length can be real
Existing twice of effective length, sensitivity are higher.But the relative angle between each optical element and positional relationship how are adjusted with reality
There is still a need for explore for existing optimal performance.
A factor for influencing electric field sensor of optic fibre measurement stability is that there are natural birefringences and thermoelectricity for electro-optic crystal
Effect, both effects all have temperature dependency.When light beam is precisely aligned along the optical axis of crystal, then it is two-fold to generate nature
It penetrates, pyroelectric effect can also substantially reduce.But how to guarantee that the optical axis of crystal and beam direction precisely align, be a problem.It is small
Fault the temperature of sensor will be caused unstable.
Another factor for influencing electric field sensor of optic fibre measurement stability is wave plate.Optical fibre voltage sensor is to big letter
Number carry out intensity modulated when, by Bessel function analysis it can be found that intensity modulation wave will appear distortion, in addition to linear term and also
A large amount of harmonic components can be generated, this is related with the wave plate phase place of bias is played.Therefore the quality of wave plate and position angle are to light
Fine electric-field sensor probe measurement precision is affected.
Summary of the invention
It is an object of the present invention to provide the probes and its Method of Adjustment of a kind of reflection type optical fiber electric-field sensor, solve reflection
The adjustment problem of sonde configuration in formula electric field sensor of optic fibre reduces the adverse effect of each element defect generation itself, realizes each
Element relative position optimizes, and improves measurement sensitivity and stability.
To achieve the goals above, on the one hand, the probe of reflection type optical fiber electric-field sensor provided by the invention, wherein
Reflection type optical fiber electric-field sensor includes laser, polarization maintaining optical fibre, three port circulators and photodetector, and polarization maintaining optical fibre is from three
The first port of port circulator accesses, and photodetector is set to the third port of three port circulators；Probe includes:
Fixed device has groove structure, is fixed with the polarizing film being sequentially arranged, lithium columbate crystal, 1/8 in groove structure
Wave plate and reflector plate；
Quartz socket tube, one end are inserted with collimation lens, and the other end is encapsulated with quartz cylinder, and fixed device is fixed on stone
In the middle part of English casing, collimation lens connects the second port of three port circulators.
In above-mentioned technical proposal, the light that laser issues passes sequentially through three port circulators, collimation lens, polarizing film, niobium
Sour crystalline lithium and 1/8 wave plate, are then reflected by reflector plate and again pass by 1/8 wave plate, lithium columbate crystal, polarizing film, standard
Be emitted after straight lens from three port circulators, three port, with photodetector measurement by output intensity be converted to current or voltage with
Convenient for measurement analysis.Tested electric field is loaded into optical path in the form of phase difference by the pockel effect of lithium columbate crystal, is reflected
So that lithium columbate crystal effective length doubles, sensitivity is significantly improved.
Preferably, the extinction ratio of polarizing film is at least 40dB.In entire sonde configuration, need to guarantee polarizing film extinction ratio
Reach 40dB or more, convenient for determining the accurate location of electro-optic crystal during adjustment, while it is sensitive to improve measurement in the measurements
Degree.Polarizing film light transmission shaft is in the horizontal direction.
In entire sonde configuration, needs to guarantee that the optical axis of electro-optic crystal is precisely aligned with beam direction, just will not in this way
Natural birefringence is generated, while pyroelectric effect can also substantially reduce.Natural birefringence effect can reduce probe measurement sensitivity, and
And natural birefringence and pyroelectric effect will lead to the temperature dependency of electro-optic crystal.According to linear electro-optic effect coupled-mode theory,
The exact relationship of available electro-optic crystal optical axis and beam direction.Preferably, the optical axis and laser beam of lithium columbate crystal
Direction it is parallel.
Preferably, the fast axle angle of the light transmission shaft of polarizing film and 1/8 wave plate is 45 °.Optical path can be twice by reflector plate
By 1/8 wave plate, to generate 90 ° of bit phase delays, to allow probe work in linear zone, voltage and output intensity to be measured are realized
Between linear relationship, improve measurement sensitivity.
In order to improve the quality of 1/8 wave plate, the introducing of a large amount of harmonic components is reduced, so that detectivity is improved, as
It is preferred that 1/8 wave plate is coated with anti-reflection film, it is ensured that 1/8 wave plate produce when fast axle diagonally.
In order to ensure the reflection loss of reflector plate is small, preferably, reflector plate is coated with the optical maser wavelength with laser transmitting
Corresponding high-reflecting film.Presently used laser center wavelength 1550nm, therefore reflector plate needs plated film (such as HR film) to realize
It is greater than 98% in 1550 wave band reflectivity.
On the other hand, reflection type optical fiber electric-field sensor provided by the invention probe Method of Adjustment the following steps are included:
1) laser issue laser, transmitted through polarization maintaining optical fibre, by after three port circulator first ports from second port
It is emitted and is entered collimation lens, fixes collimation lens with sextuple adjusting bracket, with fixture fixed groove structure, comes out collimation lens
Laser pass through groove center；
2) polarizing film is put into groove structure, rotates collimation lens with sextuple adjusting bracket, while adjusting polarizing film, until minimum
After optical power is below -40dB, adjusts through the optical power after polarizing film up to maximum, polarizing film is fixed；
3) reflector plate is fixed with three-dimensional adjustable shelf in the other end of groove structure, adjust reflector plate until from three ports
The maximum optical power that the third port of circulator measures；
4) a quarter wave plate is fixed with 360 ° of rotatable adjusting brackets between polarizing film and reflector plate, rotates quarter wave plate,
Until the optical power that third port measures is fixed less than after -40dB；
5) lithium columbate crystal is put into groove structure, uses the laser for transmiting and being reflected back can by lithium columbate crystal
Optical fiber stabs dynamic lithium columbate crystal, and the optical power measured by the third port is less than -40dB, it is ensured that optical power is less than -40dB feelings
Solidify lithium columbate crystal under condition；
6) reflector plate is sticked on three-dimensional adjustable shelf with heat-conducting silicone grease, three-dimensional adjustable shelf is adjusted, until being reflected back third end
The laser power of mouth is maximum, and it is recessed until reflector plate to be moved into that three-dimensional adjustable shelf is adjusted when observing third port laser power variation
In slot.Then, 1/8 wave plate is put between crystal and reflector plate, adjusts 1/8 wave plate sees whether third port laser power is lucky
Halve (before do not put 1/8 wave plate compared with laser power).If successfully halving, takes away 1/8 wave plate and solidify reflector plate；If adjusting 1/
8 wave plates can not make laser power successfully halve (bigger than normal or less than normal), take away 1/8 wave plate, finely tune reflector plate, then 1/8 wave plate is put
Can enter to see halve, and (judgment criteria: the laser that reflector plate is reflected back can successfully be halved after being put into 1/8 wave plate by repeatedly adjusting
Power is as big as possible, while successfully halving after adding 1/8 wave plate).1/8 wave plate is taken away after mixing up reflector plate, solidifies reflector plate；
7) 1/8 wave plate is put between the lithium columbate crystal of groove structure and reflector plate, adjusts 1/8 wave plate position until the
Three port laser powers are fixed after half before putting wave plate；
8) groove structure for fixing polarizing film, lithium columbate crystal, 1/8 wave plate and reflector plate is placed into the middle part of casing,
The lens end cap of collimation lens is entered into quartz socket tube end, the one end for connecting optical fiber is exposed outside, rotates sextuple adjusting bracket and adjusts
Groove structure is saved, it is laggard as the optical power after fixing 1/8 wave plate in step 7) until measuring optical power from third port
Row is fixed；
9) in the quartzy small column sealing of the other end of quartz socket tube.
Preferably, each element is all made of ultraviolet glue in each element and quartz socket tube in groove structure, and use
Ultraviolet lamp is irradiated fixation.
Compared with prior art, the invention has the benefit that
The probe and its Method of Adjustment of reflection type optical fiber electric-field sensor of the invention, solution can reflection type optical fiber voltage biographies
The adjustment problem of sensor sonde configuration reduces the adverse effect of each element defect generation itself, realizes each element relative position most
Optimization improves measurement sensitivity and stability.
Detailed description of the invention
Fig. 1 is transmission-type electric field sensor of optic fibre structural schematic diagram traditional in background of invention；
Fig. 2 is the structural schematic diagram of the reflection type optical fiber electric-field sensor of the embodiment of the present invention；
Fig. 3 is the sonde configuration schematic diagram of the embodiment of the present invention；
Fig. 4 is the inclined of light after passing through each optical element in the embodiment of the present invention in optical path used in adjusting lithium columbate crystal optical axis
Polarization state variation diagram, including passing through the polarization state (1) after collimation lens and polarizing film from circulator second port shoot laser；Laser
Polarization state (2) after continuing through lithium columbate crystal；Laser continues through the polarization state (3) after quarter wave plate；Laser is from reflector plate
Reflected polarization state (4)；Laser reflects from reflector plate and passes through the polarization state (5) after quarter wave plate；Laser is from reflection
Piece reflects and passes through the polarization state (6) after quarter wave plate and lithium columbate crystal；
Fig. 5 is the inclined of light after passing through each optical element in the embodiment of the present invention in optical path used in adjusting lithium columbate crystal optical axis
Polarization state changes comsol simulation drawing；
Fig. 6 is the relational graph of lithium columbate crystal optical axis and beam direction drift angle and temperature stability in the embodiment of the present invention,
Wherein, it is 1.8 ° that (a) figure, which simulates drift angle, 18 °, 90 °, when being tested electric field 20000V in cross-polarization system temperature and opposite
The relation curve of output intensity；(b) figure simulates between 0~18 ° of drift angle, be tested electric field be 0 when in cross-polarization system niobium
The relationship of sour crystalline lithium drift angle and temperature stability.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, with reference to embodiments and its attached drawing is to this hair
It is bright to be described further.
Embodiment
Referring to figs. 2 and 3, the reflection type optical fiber electric-field sensor of the embodiment of the present invention includes laser 001, polarization maintaining optical fibre
002, three port circulators 003 and photodetector 004, polarization maintaining optical fibre 002 connect from the first port of three port circulators 003
Enter, photodetector 004 is set to the third port of three port circulators.
Probe includes:
Fixed device 005 has groove structure, be fixed in groove structure by ultraviolet glue the polarizing film 3 being sequentially arranged,
Lithium columbate crystal 4,1/8 wave plate 5 and reflector plate 6；
Quartz socket tube 006, one end is inserted with collimation lens 2, and is fixed by ultraviolet glue, and the other end is encapsulated with quartzy circle
Cylinder 1, is equally fixed by ultraviolet glue, and fixed device 005 is fixed on 006 middle part of quartz socket tube, collimation lens 2 by ultraviolet glue
Connect the second port of three port circulators 003.
The light that laser 001 issues passes sequentially through three port circulators 003, collimation lens 2, polarizing film 3, lithium columbate crystal
Then 4 and 1/8 wave plate 5 is reflected by reflector plate 6 and again passes by 1/8 wave plate 5, lithium columbate crystal 4, polarizing film 3, collimation
It is emitted after lens 2 from the third port of three port circulators 003, is measured with photodetector 004 and output intensity is converted into electricity
Stream or voltage are analyzed in order to measure.Tested electric field is loaded into optical path by the pockel effect of electro-optic crystal in the form of phase difference
In, it reflects so that lithium columbate crystal effective length doubles, sensitivity significantly improves.
In entire sonde configuration, guarantee that 3 extinction ratio of polarizing film reaches 40dB or more, convenient for determining lithium niobate during adjustment
The accurate location of crystal 4, while measurement sensitivity can be improved in the measurements.3 light transmission shaft of polarizing film is in the horizontal direction.
In entire sonde configuration, guarantees that the optical axis of lithium columbate crystal 4 is precisely aligned with beam direction, just will not produce in this way
Raw natural birefringence, while pyroelectric effect can also substantially reduce.Natural birefringence effect can reduce probe measurement sensitivity, and
Natural birefringence and pyroelectric effect will lead to the temperature dependency of lithium columbate crystal 4.According to linear electro-optic effect coupled-mode theory,
The exact relationship of available electro-optic crystal optical axis and beam direction.Fig. 6 is that the optical axis of crystal and beam direction drift angle and temperature are steady
Qualitative relational graph.When tested electric field is 0, there are certain relationships between drift angle and temperature stability.To guarantee nature simultaneously
Birefringent and pyroelectric effect is smaller, then needs as to make the optical axis of crystal parallel with beam direction as possible.
In entire sonde configuration, guarantee that the fast axle angle of 3 light transmission shaft of polarizing film and 1/8 wave plate 5 is 45 °, optical path is passed through
Reflector plate can pass twice through 1/8 wave plate, to generate 90 ° of bit phase delays, to allow probe work in linear zone, realize electricity to be measured
Linear relationship between pressure and output intensity improves measurement sensitivity.Furthermore wave plate requires high quality, otherwise can introduce a large amount of humorous
Wave component reduces detectivity.1/8 wave plate ensures fast axle diagonally when producing, and plates anti-reflection film.
In entire sonde configuration, guarantee that the reflection loss of reflector plate 6 is very small, plating and laser on the surface of reflector plate 6
The corresponding high-reflecting film of wavelength.
The probe Method of Adjustment of the reflection type optical fiber electric-field sensor of the present embodiment the following steps are included:
S100 laser 001 issues laser, transmits through polarization maintaining optical fibre 002, passes through the first port of three port circulators 003
It is emitted afterwards from second port, into collimation lens 2, fixes collimation lens 2 with sextuple adjusting bracket, with fixture fixed groove structure,
Make the laser of collimation lens 2 out approximately through the center of groove structure.
A little ultraviolet glue is glued in S200 groove structure one end, and polarizing film 3 is put up, and rotates collimation lens with sextuple adjusting bracket
2, while polarizing film 3 is finely tuned, after determining minimum optical power below -40dB, it is transferred to through the optical power after polarizing film 3 up to most
Greatly, it keeps collimation lens 2 and 3 position of polarizing film constant, is solidified and be heating and curing with ultraviolet light irradiation.
A reflector plate 6 is fixed with three-dimensional adjustable shelf every about 10cm after S300 groove structure, adjusts reflector plate 6 until from three
The maximum optical power that the third port of port circulator 003 measures.
A quarter wave plate 5 is fixed with 360 ° of rotatable adjusting brackets between S400 groove structure and reflector plate 6, rotates 1/4 wave
Piece 5 determines that third port measures maximum optical power value and minimum value (minimum value need to be less than -40dB)；Quarter wave plate is rotated until 3
Port measures after optical power is less than -40dB and fixes
S500 glues a little ultraviolet glue after polarizing film 3 on the groove structure again, and lithium columbate crystal 4 is put up, make transmission and
The laser being reflected back can be transferred through lithium columbate crystal 4, dynamic lithium columbate crystal 4 be stabbed with optical fiber, until third port measures optical power
Less than -40dB, side is solidified with ultraviolet light irradiation, and optical power fluctuation situation is observed on side, it is ensured that optical power is always less than -40dB situation
Lower solidification lithium columbate crystal 4 reheats solidification.
S600 notch end glues a little ultraviolet glue, reflector plate 6 is sticked on three-dimensional adjustable shelf with heat-conducting silicone grease, away from groove
Three-dimensional adjustable shelf is fixed and adjusted at about 5mm, until the laser power for being reflected back third port is maximum；It observes third port and swashs in side
Optical power change side adjusts three adjusting brackets and is moved into groove until by reflector plate 6.Then, 1/8 wave plate is put into crystal and anti-
Penetrate between piece, adjust 1/8 wave plate see whether third port laser power halves just (with do not put laser power phase before 1/8 wave plate
Than).If successfully halving, takes away 1/8 wave plate and solidify reflector plate；Laser power can not be made successfully to halve (partially if adjusting 1/8 wave plate
It is big or less than normal), 1/8 wave plate is taken away, finely tunes reflector plate, then 1/8 wave plate is put into and sees and can halve, is repeatedly adjusted until being put into 1/
Can successfully halve after 8 wave plates (judgment criteria: the laser power that reflector plate is reflected back is as big as possible, at the same add 1/8 wave plate after success
Halve).1/8 wave plate is taken away after mixing up reflector plate, is solidified and is heating and curing with ultraviolet light irradiation, which all ensures that third port
Laser power be maximum.
A little ultraviolet glue is glued in S700 groove between lithium columbate crystal and reflector plate, 1/8 wave plate 5 is put up, adjusts wave
At this moment piece position just can determine that 3 light transmission shaft of polarizing film and 1/8 wave plate until the half that third port laser power is before putting wave plate
5 fast axle angle is 45 °, is solidified and is heating and curing with ultraviolet light irradiation.
The intermediate and one end in quartz socket tube 006 S800 smoothens one layer of ultraviolet glue, will fix polarizing film 3, lithium niobate crystal
The groove structure of body 4,1/8 wave plate 5 and reflector plate 6 adheres in quartz socket tube 006 in the ultraviolet glue of middle part, by the saturating of collimation lens 2
Mirror end is sticked to 006 edge of quartz socket tube, and the one end for connecting optical fiber is exposed outside, rotates sextuple adjusting bracket and finely tunes groove structure,
Until measuring optical power as the optical power after fixing wave plate in step S700 from third port, solidified with ultraviolet light irradiation
And be heating and curing collimation lens 2 and groove structure.
In the case that S700 above step is finished, ultraviolet glue is applied in one end inner wall that quartz socket tube 006 is open, it will be quartzy
Cylindrical body 1 be fixed in reach closed effect, solidified and be heating and curing with ultraviolet light irradiation.
In reflective optic electric-field sensor in the assembling steps of sonde configuration, lithium columbate crystal 4, which needs to adjust, arrives crystal
Optical axis it is parallel with direction of laser propagation, natural birefringence effect just will not occur in this way and be divided into o light and e light, to make more
Light participate in the calibration to signal, improve sensitivity.In order to judge whether the optical axis of crystal is parallel with direction of laser propagation, need
Build an optical path: collimation lens-polarizing film-lithium columbate crystal-quarter wave plate-reflector plate, wherein the light transmission shaft of polarizing film is flat
It is capable or vertical, the fast axle of quarter wave plate and horizontally and vertically 45 ° of angle.If polarizing film light transmission shaft is in the x-direction,
After laser is by collimation lens and polarizing film, polarization direction is along x-axis, such as Fig. 4 (1)；Assuming that the optical axis direction of lithium columbate crystal with
Direction of laser propagation is parallel, then polarised light is not by separating into o light and e light after crystal, and polarization direction is still along x-axis, such as Fig. 4
(2)；The fast axle of quarter wave plate and x, y-axis angle are 45 ° again, therefore light is such as schemed by becoming rotatory polarization from line polarisation after wave plate
4(3)；It is still rotatory polarization after being reflected from reflector plate, such as Fig. 4 (4)；Again by becoming from rotatory polarization along y-axis after quarter wave plate
Line polarisation, such as Fig. 4 (5)；Because the optical axis direction of lithium columbate crystal is parallel with direction of laser propagation, by after crystal
Light is still the line polarisation along y-axis, such as Fig. 4 (6)；And the light transmission shaft of polarizing film is along x-axis, therefore the polarised light being reflected back can not lead to
Polarizing film is crossed, the optical power measured from third port is 0.Here it is lithium niobate crystal that third port, which measures the condition that optical power is 0,
Body optical axis is parallel with optical propagation direction.If the optical axis of crystal and optical propagation direction are not parallel, light pass through crystal after can be divided into o light and
E light, thus reflected light must some by polarizing film, so that third port, which measures optical power, to be 0.This is just
Be judge the optical axis of crystal whether the foundation parallel with optical propagation direction.
Fig. 5 is the inclined of light after passing through each optical element in the embodiment of the present invention in optical path used in adjusting lithium columbate crystal optical axis
Polarization state changes comsol simulation drawing.It is just the same with Fig. 4 theory polarization state, demonstrate theoretical accuracy.
Fig. 6 is the relational graph of the optical axis of crystal and beam direction drift angle and temperature stability in the embodiment of the present invention.(a) in figure
Simulating drift angle is 1.8 °, 18 °, 90 °, when being tested electric field 20000V in cross-polarization system temperature and opposite output intensity
Relation curve.(b) figure simulates between 0~18 ° of drift angle, be tested electric field be 0 when in cross-polarization system crystal drift angle and temperature
Spend the relationship of stability.Horizontal axis is crystal and beam direction drift angle, and the longitudinal axis is the local derviation that output input light intensity compares temperature, the value
Illustrate that temperature stability is better closer to 0.When largest light intensity is 10mW, in the case where guaranteeing drift angle less than 4 °, minimum output
Light intensity reaches -41dBm hereinafter, it is ensured that drift angle is at 0.45 ° or less.
Claims (8)
1. a kind of probe of reflection type optical fiber electric-field sensor, reflection type optical fiber electric-field sensor include laser, polarization maintaining optical fibre,
Three port circulators and photodetector, the polarization maintaining optical fibre are accessed from the first port of three port circulator, the light
Electric explorer is set to the third port of three port circulator；It is characterized in that, the probe includes:
Fixed device has groove structure, is fixed with the polarizing film being sequentially arranged, lithium columbate crystal, 1/8 in the groove structure
Wave plate and reflector plate；
Quartz socket tube, one end are inserted with collimation lens, and the other end is encapsulated with quartz cylinder, and the fixed device is fixed on stone
In the middle part of English casing, the collimation lens connects the second port of three port circulator.
2. probe according to claim 1, which is characterized in that the extinction ratio of the polarizing film is at least 40dB.
3. probe according to claim 1, which is characterized in that the optical axis of the lithium columbate crystal and the side of laser beam
To parallel.
4. probe according to claim 1, which is characterized in that the fast axle of the light transmission shaft of the polarizing film and 1/8 wave plate
Angle is 45 °.
5. probe according to claim 1, which is characterized in that 1/8 wave plate is coated with anti-reflection film.
6. probe according to claim 1, which is characterized in that the reflector plate is coated with the laser wave with laser transmitting
Long corresponding high-reflecting film.
7. a kind of probe Method of Adjustment of reflection type optical fiber electric-field sensor, is wanted for any right in adjustment claim 1~6
Seek the probe, which comprises the following steps:
1) laser issues laser, transmits through polarization maintaining optical fibre, by being emitted after three port circulator first ports from second port
And enter collimation lens, collimation lens is fixed with sextuple adjusting bracket, with fixture fixed groove structure, comes out collimation lens sharp
Light passes through groove center；
2) polarizing film is put into groove structure, collimation lens is rotated with sextuple adjusting bracket, while adjusting polarizing film, until minimum light function
After rate is below -40dB, adjusts through the optical power after polarizing film up to maximum, polarizing film is fixed；
3) a reflector plate is fixed with three-dimensional adjustable shelf in the other end of groove structure, adjusts reflector plate until annular from three ports
The maximum optical power that the third port of device measures；
4) a quarter wave plate is fixed with 360 ° of rotatable adjusting brackets between polarizing film and reflector plate, rotates quarter wave plate, until
The optical power that third port measures is fixed after being less than -40dB；
5) lithium columbate crystal is put into groove structure, the laser for transmiting and being reflected back is made to use optical fiber by lithium columbate crystal
Dynamic lithium columbate crystal is stabbed, the optical power measured by the third port is less than -40dB, it is ensured that optical power is less than in the case of -40dB
Solidify lithium columbate crystal；
6) reflector plate is sticked on three-dimensional adjustable shelf with heat-conducting silicone grease, three-dimensional adjustable shelf is adjusted, until being reflected back third port
Laser power is maximum, adjusts three-dimensional adjustable shelf until reflector plate is moved into groove when observing third port laser power variation
It is interior；Then, 1/8 wave plate is put between crystal and reflector plate, adjusts 1/8 wave plate and sees third port laser power and do not put 1/8
Whether laser power, if halving, takes away 1/8 wave plate and solidifies reflector plate compared to halving before wave plate；If adjusting 1/8 wave plate can not make
Can laser power successfully halves, and takes away 1/8 wave plate, finely tune reflector plate, then 1/8 wave plate is put into and sees and halve, and repeatedly adjusts straight
Can successfully it halve to after being put into 1/8 wave plate；1/8 wave plate is taken away after mixing up reflector plate, solidifies reflector plate；；
7) 1/8 wave plate is put between the lithium columbate crystal of groove structure and reflector plate, adjusts 1/8 wave plate position until third end
Mouthful laser power is fixed after half before putting wave plate；
8) groove structure for fixing polarizing film, lithium columbate crystal, 1/8 wave plate and reflector plate is placed into the middle part of casing, it will be quasi-
The lens end cap of straight lens enters quartz socket tube end, and the one end for connecting optical fiber is exposed outside, rotates sextuple adjusting bracket and adjusts recessed
Slot structure is consolidated after measuring optical power as the optical power after fixing 1/8 wave plate in step 7) from third port
It is fixed；
9) in the quartzy small column sealing of the other end of quartz socket tube.
8. probe Method of Adjustment according to claim 7, which is characterized in that each element and institute in the groove structure
Each element is all made of ultraviolet glue in the quartz socket tube stated, and is irradiated fixation using ultraviolet lamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN111751595A (en) * | 2020-06-01 | 2020-10-09 | 贵州江源电力建设有限公司 | Miniaturized optical fiber voltage sensor and information processing system |
| CN113341236A (en) * | 2021-05-31 | 2021-09-03 | 昆明理工大学 | Polarization maintaining optical fiber coupling type electro-optical crystal electric field sensor |
| CN116930629A (en) * | 2023-09-15 | 2023-10-24 | 清华大学 | Electric field sensing device and method |
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| CN111239500A (en) * | 2020-02-20 | 2020-06-05 | 云南电网有限责任公司电力科学研究院 | Transformer inner space electric field measurement system |
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| CN113341236A (en) * | 2021-05-31 | 2021-09-03 | 昆明理工大学 | Polarization maintaining optical fiber coupling type electro-optical crystal electric field sensor |
| CN113341236B (en) * | 2021-05-31 | 2024-03-01 | 昆明理工大学 | Polarization maintaining fiber coupling type electrooptical crystal electric field sensor |
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| CN116930629B (en) * | 2023-09-15 | 2023-12-22 | 清华大学 | Electric field sensing device and method |
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