CN113341236B - Polarization maintaining fiber coupling type electrooptical crystal electric field sensor - Google Patents
Polarization maintaining fiber coupling type electrooptical crystal electric field sensor Download PDFInfo
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- 238000004806 packaging method and process Methods 0.000 claims abstract description 75
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- 230000003287 optical effect Effects 0.000 claims abstract description 30
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- GQYHUHYESMUTHG-UHFFFAOYSA-N lithium niobate Chemical compound [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 claims description 24
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
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- G01R29/0878—Sensors; antennas; probes; detectors
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Abstract
The invention discloses a polarization maintaining fiber coupling type electro-optic crystal electric field sensor, which comprises an input end packaging base, an input polarization maintaining fiber collimator, an electro-optic crystal, a packaging shell, an output polarization maintaining fiber collimator and an output end packaging base, wherein the input end packaging base is provided with a plurality of input end packaging holes; the output end face of the input polarization maintaining fiber collimator is arranged in parallel with the light passing face of the electro-optic crystal; the electro-optical crystal is positioned between the input polarization maintaining fiber collimator and the output polarization maintaining fiber collimator, and the output polarization maintaining fiber collimator and the input polarization maintaining fiber collimator are coaxially arranged; the input end packaging base and the output end packaging base are both fixed on the packaging shell; the polarization maintaining fiber is coupled with the input polarization maintaining fiber collimator and the output polarization maintaining fiber collimator respectively. The invention solves the problem of setting a static working point by utilizing the torsion of the polarization maintaining optical fiber, and reduces the use of a 1/4 wave plate; the transmission efficiency of the optical path is improved by the direct coupling of the polarization maintaining optical fiber, the use of a polarizer is reduced, and the design structure of the sensor is simplified.
Description
Technical Field
The invention relates to the technical field of optical electric field sensors, in particular to a polarization maintaining fiber coupling type electro-optic crystal electric field sensor.
Background
With the development of the power industry in China, the power industry has put higher requirements on an electric field sensor, and many traditional methods for measuring a high-voltage electric field exist, for example: electrostatic voltmeters, ball gaps, electromagnetic voltage transformers, resistive voltage dividers, capacitive voltage dividers, and the like. However, as the voltage class and the capacity of the power system are increased, the requirements for measurement and protection are continuously improved, and the defects of the power system are increasingly prominent, and mainly expressed by the following steps: 1. the insulation difficulty is high, particularly more than 500kV, and the volume, the weight and the price of the transformer are disproportionately improved due to insulation; 2. the inherent magnetic saturation of the transformer core structure has small dynamic range and narrow frequency band; 3. the secondary output signal cannot be directly interfaced with the digital metering and protecting equipment; 4. the capacitive voltage division type voltage transformer is easy to generate ferromagnetic resonance. The optical electric field sensor designed based on the electro-optical effect can overcome the inherent defects of the traditional electric field sensor, and has bright development prospect and application prospect.
Currently, measurement of an external electric field by an optical waveguide or an electro-optical effect of an electro-optical crystal becomes one of important ways to measure the external electric field. The optical waveguide electric field sensor with integrated optical design has good measurement effect, but the manufacturing process of the integrated photoelectric field sensor is complex and the manufacturing cost is more expensive, and the lithium niobate crystal optical electric field sensor developed by utilizing the separated optical element is widely applied to the measurement of an external electric field because of the advantages of simple structure, lower cost, suitability for high field intensity measurement and the like.
In a conventional electro-optic crystal optical electric field sensor, a sensing unit is generally composed of a single-mode fiber collimator, a polarizer, a 1/4 wave plate, an electro-optic crystal, an analyzer and a multimode fiber collimator, so as to realize linear measurement of an external electric field. The sensor unit is internally provided with a polarizer, a 1/4 wave plate and other separated optical elements, so that the setting mode of a static working point of an optical path is complex, the coupling loss of the optical path is high, and the structural compactness of the sensor is limited.
Disclosure of Invention
The invention aims to provide a polarization maintaining fiber coupling type electro-optic crystal electric field sensor, which reduces the use of a polarizer, a 1/4 wave plate and other separation optical elements while realizing the setting of a static working point, simplifies the design structure of the sensor and improves the coupling efficiency of the sensor.
In order to achieve the above object, the present invention provides the following solutions: the invention provides a polarization maintaining fiber coupling type electro-optical crystal electric field sensor, which comprises an input end packaging base, an input polarization maintaining fiber collimator, an electro-optical crystal, a packaging shell, an output polarization maintaining fiber collimator and an output end packaging base, wherein the input end packaging base is provided with a plurality of input end packaging holes; the input polarization maintaining optical fiber collimator and the electro-optical crystal are fixed in the input end packaging base in a glue injection mode, and the output end face of the input polarization maintaining optical fiber collimator and the input end face of the output polarization maintaining optical fiber collimator are arranged in parallel with the light passing face of the electro-optical crystal; the output polarization maintaining optical fiber collimator is fixed in the output end packaging base in a glue injection mode, the electro-optical crystal is positioned between the input polarization maintaining optical fiber collimator and the output polarization maintaining optical fiber collimator, and the output polarization maintaining optical fiber collimator and the input polarization maintaining optical fiber collimator are coaxially arranged; the input end packaging base and the output end packaging base are both fixed on the packaging shell; the input end packaging base and the output end packaging base are respectively fixed with polarization maintaining optical fibers, and the polarization maintaining optical fibers are respectively coupled with the input end face of the input polarization maintaining optical fiber collimator and the output end face of the output polarization maintaining optical fiber collimator; the polarization maintaining optical fiber is connected with the input end packaging base, an input end polarization maintaining optical fiber fixing point is arranged on the polarization maintaining optical fiber, the polarization maintaining optical fiber is fixed with the input end packaging base at the input end polarization maintaining optical fiber fixing point, and the polarization maintaining optical fiber between the input polarization maintaining optical fiber collimator and the input end polarization maintaining optical fiber fixing point is twisted by pi/2 angle.
As a further description of the technical scheme, after the vibration direction of the linearly polarized light input by the tunable polarization maintaining light source is aligned with the slow axis of the polarization maintaining optical fiber, the linearly polarized light enters the sensor to be subjected to electro-optic modulation, the polarized signal output by the sensor is transmitted to the polarization maintaining optical fiber polarization analyzer through the polarization maintaining optical fiber, the polarized light signal after polarization detection enters the photoelectric detector to be subjected to photoelectric conversion, and finally, the polarized light signal is transmitted to the oscilloscope through the oscilloscope probe wire to display the time domain information of an external electric field.
Preferably, the distance between the fixed point of the input polarization maintaining fiber and the input end face of the input polarization maintaining fiber collimator is 1-2mm.
Preferably, the polarization maintaining optical fiber is panda type polarization maintaining optical fiber, and the beat length of the polarization maintaining optical fiber is 2-4mm.
Preferably, the input end packaging base is printed by adopting ABS plastic for the 3D printer, the input end packaging base is of a cuboid structure, grooves matched with the input polarization maintaining fiber collimator and the electro-optic crystal are formed in the input end packaging base, and the external dimensions of the input end packaging base are 54-65mm long, 8-12mm wide and 9-13mm high.
Preferably, the input polarization maintaining fiber collimator and the polarization maintaining fiber are connected and cured in a glue injection mode, the input polarization maintaining fiber collimator is a cylindrical glass collimator, and the output end face of the input polarization maintaining fiber collimator is a plane; the length of the input polarization maintaining fiber collimator is 8-15mm, and the diameter is 2-3mm.
Preferably, the electro-optic crystal is a lithium niobate crystal with a processing customized optical grade, the lithium niobate crystal is in a cuboid structure, the length of the lithium niobate crystal is 42.2-62mm, the width of the lithium niobate crystal is 4-6mm, and the height of the lithium niobate crystal is 4-6mm.
Preferably, the packaging shell is printed by adopting ABS plastic for a 3D printer, the packaging shell is of a cuboid structure, and the external dimension of the packaging shell is 78-88mm long, 9-12mm wide and 8-10mm high.
Preferably, the output polarization maintaining fiber collimator and the input polarization maintaining fiber collimator are combined in a pair and have the same parameters, and the coupling distance between the output polarization maintaining fiber collimator and the input polarization maintaining fiber collimator is 47-67mm.
Preferably, the output end packaging base is printed by PLA plastic for the 3D printer, the output end packaging base is of a cuboid structure, a groove matched with the output polarization maintaining fiber collimator is formed in the output end packaging base, and the external dimension of the output end packaging base is 9-13mm long, 8-11mm wide and 9-12mm high.
The working principle of the invention is as follows: when the polarization-maintaining fiber coupling type lithium niobate crystal electric field sensor provided by the invention is used for measuring an electric field, the vibration direction of linearly polarized light output by a tunable polarization-maintaining light source is aligned with the slow axis of the polarization-maintaining fiber, and the polarized light E in the polarization-maintaining fiber is aligned at the moment o The method comprises the following steps:
in E x ，E y The light components on the fast axis, respectively. After the polarization maintaining fiber with the length of l is twisted by an angle theta, the input polarization maintaining fiber collimator outputs polarized light E due to the circular double refraction effect generated after the polarization maintaining fiber is twisted out The method comprises the following steps:
in E ζ 、E η The light components on the new fast and slow axes after the polarization maintaining fiber is twisted respectively, and delta is the polarization maintaining fiber with l lengthAnd a phase difference is generated between the fast axis and the slow axis after the angle. Note that the phase difference delta and the twisted polarization maintaining fiber length l and the twist angle +>The following relationship exists:
δ＝l/θ (3)
therefore, after the front end of the input polarization maintaining fiber collimator is twisted by pi/2 angle with the length equal to 1/2 beat length, the phase difference delta between the fast axis and the slow axis changes by pi, and the light vector E output by the polarization maintaining fiber out The process is as follows:
wherein: e (E) out Is right circularly polarized light. It can be seen that the polarized light incident to the crystal along the z direction is circularly polarized light, and the phase modulation of the y-direction electric field causes the phase difference of the circularly polarized light according to the electro-optic effect of the lithium niobate crystalThe method comprises the following steps:
wherein: l is the light transmission length of the crystal, E is the intensity of an external electric field, lambda is the wavelength of incident light, n o Refractive index of o light, r 22 The electro-optic coefficient of the lithium niobate crystal is that of the lithium niobate crystal, and kappa is the ratio of the external electric field to the internal electric field of the lithium niobate crystal. The applied electric field for generating pi phase difference between two light waves is called half-wave electricityA field, denoted as:
the polarized light output by the sensor is transmitted to a polarization maintaining fiber polarization analyzer by a polarization maintaining fiber, and the optical power P output after interference is transmitted out The method comprises the following steps:
wherein: a is the optical path loss coefficient, b is the extinction ratio of the sensing system, and P in In order to input the optical power of the light,a static phase difference is formed for twisting the polarization maintaining fiber. Considering that the torsion of the polarization-maintaining fiber introduces pi/2 static phase difference for the sensor, the polarization-maintaining fiber willSubstituting (7) to obtain the output light intensity P of the sensor out The process is as follows:
at this time, if pi E (t)/E π <<Formula 1, (8) can be written as:
knowing that the photoelectric conversion coefficient of the photodetector is beta, the voltage signal V output by the sensing system out The method comprises the following steps:
as can be seen from the formula (10), after the static working point of the sensor is set to be pi/2, the voltage signal output by the sensor and the external electric field form a linear relation, so that the linear measurement of the external electric field can be realized.
Compared with the prior art, the invention has the following effects: the invention provides a polarization maintaining fiber coupling type electro-optic crystal electric field sensor, which solves the problem of setting a static working point by utilizing the torsion of a polarization maintaining fiber; the transmission efficiency of the optical path is improved by the direct coupling of the polarization maintaining optical fiber, the design structure of the sensor is simplified, and a new design scheme is provided for the development of the lithium niobate crystal electric field sensor.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a polarization maintaining fiber coupled electro-optic crystal electric field sensor according to the present invention;
the device comprises a 1-polarization maintaining optical fiber, a 2-input polarization maintaining optical fiber fixing point, a 3-input packaging base, a 4-input polarization maintaining optical fiber collimator, a 5-electro-optical crystal, a 6-packaging shell, a 7-output polarization maintaining optical fiber collimator, an 8-output packaging base, a 9-tunable polarization maintaining light source, a 10-polarization maintaining optical fiber analyzer, an 11-photoelectric detector, a 12-oscilloscope probe wire, a 13-oscilloscope and a 14-sensor.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
As shown in FIG. 1, the invention provides a polarization maintaining fiber coupling type electro-optical crystal electric field sensor, which comprises a tunable polarization maintaining light source 9, an oscilloscope 13, a plurality of polarization maintaining fibers 1, a pair of polarization maintaining fiber collimators, a lithium niobate crystal, a polarization maintaining fiber analyzer 10 and a photoelectric detector 11.
The specification and dimensions of each component in this embodiment are as follows:
the polarization-maintaining optical fiber 1 is panda type polarization-maintaining optical fiber, and the beat length is 4mm.
The input polarization maintaining fiber fixing point 2 is positioned at the front end 2mm of the input polarization maintaining fiber collimator 4.
The input encapsulation base 3 adopts the cuboid that ABS plastics printed for the 3D printer, and inside carries out the catching groove according to optical element size, outside size: 54mm long, 8mm wide and 9mm high.
The input polarization maintaining fiber collimator 4 and the polarization maintaining fiber 1 are connected and cured in a glue injection mode, and are made of glass, the output end face is a plane, the length is 10mm, and the diameter is 3mm.
The lithium niobate crystal is an electro-optic crystal with a processed and customized optical grade, and has a rectangular shape, a length of 42.2mm, a width of 6mm and a height of 6mm.
The packaging shell 6 is a cuboid shape printed by a 3D printer by adopting an ABS plastic material, is a buckle groove cuboid for fixing the packaging shell, and has the external dimensions: 78mm long, 12mm wide and 10mm high.
The output polarization maintaining fiber collimator 7 and the input polarization maintaining fiber collimator 4 are a pair of collimators, and the coupling distance between the two collimators is 47mm.
Output encapsulation base 8 adopts PLA plastics to print for the cuboid of 3D printer, and inside carries out the catching groove according to optical element size, outside size: 12mm long, 12mm wide and 10mm high.
And fixing the polarization maintaining optical fiber 1 of the input polarization maintaining optical fiber fixing point 2 at the front end 2mm of the input polarization maintaining optical fiber collimator 4, then twisting the input polarization maintaining optical fiber collimator 4 by 90 degrees, and fixing the polarization maintaining optical fiber collimator in the input end packaging base 3 through glue injection in a gap. The emergent end face of the input polarization maintaining fiber collimator 4 is fixed after being parallel to the light-transmitting face of the lithium niobate crystal. The main axis direction of the output polarization maintaining fiber collimator 7 is aligned with the main axis direction of the input polarization maintaining fiber collimator 4, and then is fixed in the output end packaging base 8 through glue injection. After the packaging glue of the input end packaging base 3 and the output end packaging base 8 is completely solidified, a packaging cover plate is arranged, and the gaps between the input end packaging base 3 and the output end packaging base 8, which are in contact with the packaging cover plate, are fixed through glue injection. After the packaging shells are completely solidified, the packaging shells are placed on an optical adjusting frame for optical path coupling, when the optical path coupling loss is minimum, the relative positions of the two packaging shells are fixed through the packaging shell 6, and then the sensor 14 can be manufactured. After the linear polarized light input by the tunable polarization maintaining light source 9 is aligned with the slow axis of the polarization maintaining optical fiber 1, the linear polarized light enters the sensor 14, is transmitted to the polarization maintaining optical fiber analyzer 10 through the polarization maintaining optical fiber 1 after passing through the sensor 14, the optical signal after polarization maintaining enters the photoelectric detector 11 for photoelectric conversion, and finally is transmitted to the oscilloscope 13 for display output through the oscilloscope probe line 12, so that the measurement of the measured electric field is completed.
The working principle of the invention is as follows: when the polarization-maintaining fiber coupling type lithium niobate crystal electric field sensor provided by the invention is used for measuring an electric field, the vibration direction of linearly polarized light output by the tunable polarization-maintaining light source 9 is aligned with the slow axis of the polarization-maintaining fiber 1, and the polarized light E in the polarization-maintaining fiber 1 is generated at the moment o The method comprises the following steps:
in E x ，E y The light components on the fast axis, respectively. After the polarization maintaining fiber 1 with the length of l is twisted by an angle theta, the input polarization maintaining fiber collimator 4 outputs polarized light E due to the circular double refraction effect generated after the polarization maintaining fiber 1 is twisted out The method comprises the following steps:
in E ζ 、E η The light components on the new fast and slow axes after the polarization-maintaining optical fiber 1 is twisted respectively, and delta is the polarization-maintaining optical fiber 1 with l length is twistedAnd a phase difference is generated between the fast axis and the slow axis after the angle. Note the phase difference delta and the twist polarization maintaining fiber 1 length l and twist angleThe following relationship exists:
δ＝l/θ (3)
therefore, after the polarization maintaining fiber 1 with the front end length equal to 1/2 beat length is twisted by pi/2 angle, the phase difference delta between the fast axis and the slow axis changes by pi, and the light vector E output by the polarization maintaining fiber 1 out The process is as follows:
wherein: e (E) out Is right circularly polarized light. It can be seen that the polarized light incident to the crystal along the z direction is circularly polarized light, and the phase modulation of the y-direction electric field causes the phase difference of the circularly polarized light according to the electro-optic effect of the lithium niobate crystalThe method comprises the following steps:
wherein: l is the light transmission length of the crystal, E is the intensity of an external electric field, lambda is the wavelength of incident light, n o Refractive index of o light, r 22 The electro-optic coefficient of the lithium niobate crystal is that of the lithium niobate crystal, and kappa is the ratio of the external electric field to the internal electric field of the lithium niobate crystal. The applied electric field for generating pi phase difference between two light waves is called a half-wave electric field, and is expressed as:
the polarized light output by the sensor 14 is transmitted to the polarization maintaining fiber analyzer 10 by the polarization maintaining fiber 1, and the optical power P output after interference out The method comprises the following steps:
wherein: a is the optical path loss coefficient, b is the extinction ratio of the sensing system, and P in In order to input the optical power of the light,a static phase difference is formed for twisting the polarization maintaining fiber 1. Considering that the twist of the polarization maintaining fiber 1 introduces a static phase difference of pi/2 for the sensor 14, the polarization maintaining fiber willSubstituting (7) to obtain the output light intensity P of the sensor 14 out The process is as follows:
at this time, if pi E (t)/E π <<Formula 1, (8) can be written as:
knowing that the photoelectric conversion coefficient of the photodetector 11 is β, the voltage signal V output by the sensing system out The method comprises the following steps:
as can be seen from the formula (10), after setting the static operating point of the sensor 14 to pi/2, the voltage signal output by the sensor 14 and the external electric field form a linear relationship, so that the linear measurement of the external electric field can be realized.
In summary, the polarization maintaining optical fiber 1 coupling type lithium niobate crystal electric field sensor 14 of the invention realizes the setting of the static working point of the sensor 14 through the torsion of the polarization maintaining optical fiber 1, avoids the use of a polarizer, a 1/4 wave plate and other separation optical elements, improves the coupling efficiency of the sensor 14, and enables the sensor 14 to realize the linear measurement of an external electric field.
In the description of the present invention, it should be understood that the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
The above embodiments are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.
Claims (9)
1. The polarization maintaining optical fiber coupling type electro-optic crystal electric field sensor is characterized in that the sensor (14) comprises an input end packaging base (3), an input polarization maintaining optical fiber collimator (4), an electro-optic crystal (5), a packaging shell (6), an output polarization maintaining optical fiber collimator (7) and an output end packaging base (8); the input polarization maintaining optical fiber collimator (4) and the electro-optical crystal (5) are fixed in the input end packaging base (3), and the output end face of the input polarization maintaining optical fiber collimator (4) and the input end face of the output polarization maintaining optical fiber collimator (7) are arranged in parallel with the light transmission face of the electro-optical crystal (5); the output polarization maintaining optical fiber collimator (7) is fixed in the output end packaging base (8), the electro-optical crystal (5) is positioned between the input polarization maintaining optical fiber collimator (4) and the output polarization maintaining optical fiber collimator (7), and the output polarization maintaining optical fiber collimator (7) and the input polarization maintaining optical fiber collimator (4) are coaxially arranged; the input end packaging base (3) and the output end packaging base (8) are both fixed on the packaging shell (6); the input end packaging base (3) and the output end packaging base (8) are respectively fixed with a polarization maintaining fiber (1), and the polarization maintaining fiber (1) is respectively coupled with the input end face of the input polarization maintaining fiber collimator (4) and the output end face of the output polarization maintaining fiber collimator (7); the input end polarization maintaining optical fiber collimator comprises an input end packaging base (3), and is characterized in that an input end polarization maintaining optical fiber fixing point (2) is arranged on the polarization maintaining optical fiber (1) connected with the input end packaging base (3), the polarization maintaining optical fiber (1) is fixed with the input end packaging base (3) at the input end polarization maintaining optical fiber fixing point (2), and the input polarization maintaining optical fiber collimator (4) and the polarization maintaining optical fiber (1) between the input end polarization maintaining optical fiber fixing points (2) are twisted by pi/2 angles.
2. The polarization maintaining fiber coupled type electro-optic crystal electric field sensor according to claim 1, wherein the distance between the input polarization maintaining fiber fixed point (2) and the input end face of the input polarization maintaining fiber collimator (4) is 1-2mm.
3. The polarization maintaining fiber coupling type electro-optic crystal electric field sensor according to claim 1, wherein the polarization maintaining fiber (1) is a panda type polarization maintaining fiber, and the beat length of the polarization maintaining fiber (1) is 2-4mm.
4. The polarization maintaining fiber coupling type electro-optic crystal electric field sensor according to claim 1, wherein the input end packaging base (3) is made of an ABS plastic material, the input end packaging base (3) is of a cuboid structure, grooves matched with the input polarization maintaining fiber collimator (4) and the electro-optic crystal (5) are formed in the input end packaging base (3), and the external dimensions of the input end packaging base (3) are 54-65-mm in length, 8-12-mm in width and 9-13-mm in height.
5. The polarization maintaining fiber coupling type electro-optic crystal electric field sensor according to claim 1, wherein the input polarization maintaining fiber collimator (4) is a cylindrical glass collimator, and the output end face of the input polarization maintaining fiber collimator (4) is a plane; the length of the input polarization maintaining fiber collimator (4) is 8-15mm, and the diameter is 2-3mm.
6. The polarization maintaining fiber coupled type electro-optic crystal electric field sensor according to claim 1, wherein the electro-optic crystal (5) is an optical grade lithium niobate crystal, the lithium niobate crystal has a cuboid structure, the length of the lithium niobate crystal is 42.2-62mm, the width is 4-6mm, and the height is 4-6mm.
7. The polarization maintaining fiber coupling type electro-optic crystal electric field sensor according to claim 1, wherein the packaging shell (6) is made of an ABS plastic material, the packaging shell (6) is of a cuboid structure, and the external dimensions of the packaging shell (6) are 78-88-mm in length, 9-12-mm in width and 8-10-mm in height.
8. The polarization maintaining fiber coupled type electro-optic crystal electric field sensor according to claim 1, wherein the parameters of the output polarization maintaining fiber collimator (7) are consistent with those of the input polarization maintaining fiber collimator (4), and the coupling distance between the output polarization maintaining fiber collimator (7) and the input polarization maintaining fiber collimator (4) is 47-67mm.
9. The polarization maintaining fiber coupling type electro-optic crystal electric field sensor according to claim 1, wherein the output end packaging base (8) is made of PLA plastic materials, the output end packaging base (8) is of a cuboid structure, a groove matched with the output polarization maintaining fiber collimator (7) is formed in the output end packaging base (8), and the external dimension of the output end packaging base (8) is 9-13mm in length, 8-11mm in width and 9-12mm in height.
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