CN205594079U - Be used for electrostatic field measuring optic fibre fabry - perot electric -field sensor - Google Patents

Abstract

Be used for electrostatic field measuring optic fibre fabry the perot electric -field sensor belongs to the sensor field, the utility model discloses an it easily arouses the electric field distortion to solve current electric -field sensor metal probe to influence the problem of test result. Including hollow hemisphere, quartzy post, two quartzy poles, insulating outer wall, quartzy thin slice, micro actuator and optical collimator, two quartzy pole levels are placed, and parallel, and perpendicular butt fusion has two quartzy poles in the middle part of the quartzy post, and intrinsic hollow hemisphere is glued to quartzy post upper end, and be located the cavity of hollow hemisphere on the quartzy post, and intrinsic quartzy thin slice is glued to quartzy post lower extreme, and quartzy thin slice level is placed, and the optical collimator up end is parallel with quartzy thin slice terminal surface, and optical collimator glues admittedly in the micro actuator, and the outside of two quartzy poles, quartzy thin slice and micro actuator the first half is provided with insulating outer wall, optical collimator's the up end and the terminal surface of quartzy thin slice plate the film of 50% reflectivity, form the FP chamber between two reflectance coatings. The utility model is used for the electric field is measured.

Description

The optical fibre Fabry-perot electric-field sensor measured for electrostatic field

Technical field

This utility model belongs to sensor field.

Background technology

Electric field measurement technology is not only widely used in the electric field intensity measured near ultra-high-tension power transmission line and around transformer station, Also understand for research worker and measurement Faulty insulator, Transformer Winding, hv cable termination, high-voltage switch equal-height press equipment attached Near Electric Field Distribution provides technological means.Measured near transmission line of electricity, around transformer station and inside power equipment by reality The size of electric field, for research transmission line of electricity monitoring running state, Electric Power Equipment Insulation state estimation, power plant design manufacture The field such as process optimization and Power System Electromagnetic Compatibility provides strong data support, healthy and stable to whole power industry Operation has great importance.

Conventional electrical measures electric field methods potentiometer balanced methods for magnesium and charge method.The measuring principle of potentiometer balanced methods for magnesium is by surveying Amount Potential distribution measures electric field, but complex process measures trouble, and accuracy is poor.Charge method is to be existed by measurement metal probe In electric field, the electric charge of capture measures electric field, but metal probe is put in electric field, and electric field can be made to produce distortion, therefore its accuracy The highest.In order to improve the structure of electric-field sensor, improving the precision of sensor, it is innovated by many scholars, such as 1992 Ohmic load dipole in year foreign scholar M.Kanda, realizes the measurement to electric field；In 20 end of the centurys, domestic application is the most universal Three-dimensional ball-type electric field measurement system, field mill formula electric field measurement system etc..Although it is measured compared with traditional electric field measurement system Scope and precision increase really, but its error is the biggest.At the beginning of 20 end of the centurys-21 century, along with Fibre Optical Communication Technology Research and development with practical, optical fiber sensing technology obtains tremendous development, and Chinese scholars turns one's attention to according to light one after another Learn principle and measure in electric field intensity, as 2004-2006 years Tsing-Hua University propose to be applied to Pockels effect and Kerr effect In electric field measurement, but owing to temperature is relatively big on its impact, therefore its accuracy is the highest.The application of 2008 Beijing university of communications is electroluminescent Luminescent effect achieves the measurement of complex electrical field, but owing to controlling light path more difficulty and being vulnerable to the impact of temperature, its performance Unstable.

Summary of the invention

This utility model purpose is easily to cause electric field distortion to solve existing electric-field sensor metal probe, thus affects The problem of test result, it is provided that a kind of optical fibre Fabry-perot electric-field sensor measured for electrostatic field.

The optical fibre Fabry-perot electric-field sensor measured for electrostatic field described in the utility model, electric-field sensor bag Include hollow hemisphere, quartz column, two quartz rods, insulation outer wall, quartz thin slice, micro actuator and optical fiber collimator；

Two quartz rod horizontal positioned, and parallel to each other, the middle part vertical of quartz column has two quartz rods, quartz column The intrinsic hollow hemisphere of upper end glue, and the upper end of quartz column is positioned at the cavity of hollow hemisphere, the intrinsic stone of lower end glue of quartz column English thin slice, quartz wafer level placement, the upper surface of optical fiber collimator is parallel with the end face of quartz thin slice, and optical fiber collimator glue is solid In micro actuator, the outside of two quartz rods, quartz thin slice and micro actuator top half is provided with insulation outer wall；

The upper surface of optical fiber collimator is parallel with the end face of quartz thin slice, and both ends of the surface are all coated with the thin film of 50% reflectance, Two reflect intermembranous formation FP chamber.

Advantage of the present utility model: the optical fibre Fabry-perot electric field measured for electrostatic field that this utility model provides Sensor, on the premise of not making electric field be distorted, improves dynamic range and the accuracy measuring electric field intensity, it is proposed that A kind of electric field measurement new method under electrostatic field environment, proposes based on Fabry-Perot (FP) principle of interference and have developed use Optical fiber FP electric-field sensor in electric field measurement.The technical specification of the FP electric-field sensor developed is as follows: the dynamic survey of electric field Weight range is 0-59KV/m, and accuracy can reach 98%.

Accompanying drawing explanation

Fig. 1 is that the structure for the optical fibre Fabry-perot electric-field sensor of electrostatic field measurement described in the utility model is shown It is intended to；

Fig. 2 is the left view of Fig. 1；

Fig. 3 is electric-field sensor FP chamber length and Output optical power relation, and wherein, abscissa represents the chamber in sensor FP chamber Long, unit is μm, and vertical coordinate represents the power of light, and unit is mW；

Fig. 4 is intensity demodulation principle schematic；

Fig. 5 is that the structure of the electric field measurement system of the optical fibre Fabry-perot electric-field sensor for electrostatic field measurement is shown It is intended to.

Detailed description of the invention

Detailed description of the invention one: present embodiment is described below in conjunction with Fig. 1 and Fig. 2, for electrostatic described in present embodiment The optical fibre Fabry-perot electric-field sensor of field measurement, electric-field sensor includes hollow hemisphere 1,2, two quartz rods of quartz column 3, insulation outer wall 4, quartz thin slice 5, micro actuator 6 and optical fiber collimator 7；

Two quartz rod 3 horizontal positioned, and parallel to each other, the middle part vertical of quartz column 2 has two quartz rods 3, stone The intrinsic hollow hemisphere of upper end glue 1 of English post 2, and the upper end of quartz column 2 is positioned at the cavity of hollow hemisphere 1, the lower end of quartz column 2 Glue intrinsic quartz thin slice 5, quartz thin slice 5 horizontal positioned, the upper surface of optical fiber collimator 7 is parallel with the end face of quartz thin slice 5, light Fine collimator 7 glue is solid in micro actuator 6, and the outside of two quartz rods 3, quartz thin slice 5 and micro actuator 6 top half is provided with absolutely Edge outer wall 4；

The upper surface of optical fiber collimator 7 is parallel with the end face of quartz thin slice 5, and both ends of the surface are all coated with the thin of 50% reflectance Film, two reflect intermembranous formation FP chamber.

In present embodiment, when sensor is placed in electric field, the outer wall of hollow hemisphere 1 is acted on by electric field force, to field Strong upper zone moves, and pulls quartz column 2, quartz column 2 to drive two quartz rods 3 that miniature deformation occurs so that the chamber in FP chamber is long Change；Owing to FP chamber length changes, light path also there occurs change, interferes light also can change therewith, signal processing Equipment obtains electric field intensity according to the change of interference fringe.

Detailed description of the invention two: embodiment one is described further by present embodiment, hollow hemisphere 1 uses polypropylene Material, its outer radius is 12.7mm, and inside radius is 11.5mm.

Detailed description of the invention three: embodiment one is described further by present embodiment, the radius in quartz column 2 cross section is 1.05mm, a length of 30mm.

Detailed description of the invention four: embodiment one is described further by present embodiment, the radius in quartz rod 3 cross section is 1.05mm, a length of 30mm.

Detailed description of the invention five: embodiment one is described further by present embodiment, quartz thin slice 5 a diameter of 10mm, thickness is 60 μm, and surface is coated with the reflectance coating that reflectance is 50%.

Detailed description of the invention six: embodiment one is described further by present embodiment, optical fiber collimator 7 end face straight Footpath is 4.13mm, and end face is coated with the reflectance coating that reflectance is 50%, and Insertion Loss is 0.3dB.

Detailed description of the invention seven: embodiment one is described further by present embodiment, insulation outer wall 4 and micro actuator 6 All use polytetrafluoroethylmaterial material.

Detailed description of the invention eight: present embodiment is described below in conjunction with Fig. 5, measures for electrostatic field described in present embodiment The electric field measurement system of optical fibre Fabry-perot electric-field sensor, this system includes electric-field sensor, ASE wideband light source 1- 1, isolator 1-2, bonder 1-3, spectroanalysis instrument 1-4, signal handling equipment 1-5, accessory structure 1-6, globular hinge hinge 1-7 and base 1-8；

The insulation outer wall 4 of electric-field sensor is fixed on the side end face of accessory structure 1-6, and the lower end of accessory structure 1-6 leads to Cross globular hinge hinge 1-7 to be fixed on base 1-8；

Being placed in DC electric field by electric-field sensor, the outer wall of hollow hemisphere 1 is acted on by electric field force, higher to field intensity Region is moved, and pulls quartz column 2, quartz column 2 to drive two quartz rods 3 that miniature deformation occurs so that the chamber length in FP chamber changes Become；The light that ASE wideband light source 1-1 sends is by after isolator 1-2, and a part accesses spectroanalysis instrument 1-4 and signal processing sets Standby 1-5, another part enters bonder 1-3, is then passed through fiber-optic transfer and enters in optical fiber collimator 7, and light is through fiber optic collimator The upper surface of device 7, enters in the FP chamber formed by optical fiber collimator 7 plated film end face and quartz thin slice 5 plated film end face, and in FP chamber Middle roundtrip is formed interferes, and in interference luminous reflectance to optical fiber collimator 7, transmits through optical fiber 8, by bonder 1-3, enters light Spectrometer 1-4 and signal handling equipment 1-5, signal handling equipment 1-5 obtain electric field intensity according to the change of interference fringe.

In present embodiment, the centre wavelength of the light that ASE wideband light source 1-1 sends is 1550nm.Optical fiber collimator 7 upper The relative photo that interference is constant phase difference, frequency is identical that end face is formed with the end face roundtrip of quartz thin slice 5.

The mode obtaining electric field intensity is:

$\mathrm{\Δ}l=l_Q+\frac{I-I_Q}{k}---\left(2\right)$

$\mathrm{\Δ}l=\frac{9{\mathrm{\π\ϵ}}_0{(\mathrm{\ϵ}-{\mathrm{\ϵ}}_0)}^2{l}^3}{192000E_0{I}_0{(\mathrm{\ϵ}+2{\mathrm{\ϵ}}_0)}^2}{R}^2{E}^2---\left(5\right).$

Wherein, △ l is the long variable quantity of sensor cavity, l_QFor the FP cavity length that Q point is corresponding, I is Output optical power, I_QFor Q point Corresponding Output optical power, k is the slope of AB line segment, ε₀For permittivity of vacuum, ε is hollow hemisphere relative dielectric constant, and l is Quartz rod length, E₀For the elastic modelling quantity of quartz material, I₀For the cross section of quartz rod used away from, R is the radius of hollow hemisphere, and E is outward Execute electric field intensity.

In the present invention, the optical fibre Fabry-perot electric-field sensor being used for electrostatic field measurement is imitated through ANSYS software Very, it is possible to obtain preferable effect, when surveyed electric field intensity reaches 60KV/m, measurement error starts to increase, and therefore selects 0- 59KV/m can reach 98% as the measurement scope of FP electric-field sensor, its accuracy rate.This sensor disclosure satisfy that electric field is surveyed The amount requirements such as range is big, accuracy is high, capacity of resisting disturbance is strong.Meanwhile, this sensor bulk is little, simple in construction, it is simple to install.This electricity Field sensor has preferable application prospect in power system.

When quartz rod internal diameter 0.4mm external diameter 2.1mm length 30mm, medium ball radius 12.7mm thickness 1.2mm, in quartz column During 0.4mm external diameter 2.1mm length 30mm of footpath, shown in Ansys simulation software simulation result table 1.

Table 1 is Ansys software emulation data

As it is shown on figure 3, from Fig. 3 selected linear interval, as shown in Figure 4, working curve is carried out linear fit, then by this plan Close the straight line working curve as sensor, such as the AB line segment in Fig. 4.

In Fig. 4, choosing the midpoint Q operating point as sensor of interval AB, FP cavity length corresponding for A, B, Q 3 is respectively For l₁、l₂、l_Q, corresponding Output optical power is I₁、I₂、I_Q, k is the slope of AB line segment, has:

$l_Q=\frac{l_1+l_2}{2},I_Q=\frac{I_1+I_2}{2},k=\frac{I_2-I_1}{l_2-l_1}---\left(1\right)$

When recording Output optical power and being I, according to linear relationship, the change of cavity length amount △ l of sensor can be obtained, it may be assumed that

$\mathrm{\Δ}l=l_Q+\frac{I-I_Q}{k}---\left(2\right)$

Can be obtained by electrodynamics theoretical derivation:

$F=\frac{9{\mathrm{\π\ϵ}}_0{(\mathrm{\ϵ}-{\mathrm{\ϵ}}_0)}^2}{4{(\mathrm{\ϵ}+2{\mathrm{\ϵ}}_0)}^2}{R}^2{E}^2---\left(3\right)$

From the deflection formula of simply supported beam:

$\mathrm{\Δ}l=\frac{{\mathrm{Fl}}^3}{48000\mathrm{\ϵ}I}---\left(4\right)$

Sensor cavity long variable quantity △ l can be obtained by formula (3) and (4) and execute outward the relation of electric field intensity E:

Wherein, ε₀For permittivity of vacuum, ε is hollow hemisphere relative dielectric constant, and l is quartz rod length, E₀For quartz material The elastic modelling quantity of material, I₀For the cross section of quartz rod used away from, R is the radius of hollow hemisphere.

From emulation data and theoretical derivation, this structure disclosure satisfy that the measurement area requirement of sensor, it is possible to accurately Measure electric field, and ensure that 98%.

Claims (6)

1. the optical fibre Fabry-perot electric-field sensor measured for electrostatic field, it is characterised in that electric-field sensor includes hollow Hemisphere (1), quartz column (2), two quartz rods (3), insulation outer wall (4), quartz thin slice (5), micro actuator (6) and optical fiber collimator (7)；

Two quartz rod (3) horizontal positioned, and parallel to each other, the middle part vertical of quartz column (2) has two quartz rods (3), The intrinsic hollow hemisphere of the upper end glue (1) of quartz column (2), and the upper end of quartz column (2) is positioned at the cavity of hollow hemisphere (1), stone The lower end glue intrinsic quartz thin slice (5) of Ying Zhu (2), quartz thin slice (5) horizontal positioned, the upper surface of optical fiber collimator (7) and stone The end face of English thin slice (5) is parallel, and optical fiber collimator (7) glue is solid in micro actuator (6), two quartz rods (3), quartz thin slice (5) The outside of micro actuator (6) top half is provided with insulation outer wall (4)；

The upper surface of optical fiber collimator (7) is parallel with the end face of quartz thin slice (5), and both ends of the surface are all coated with the thin of 50% reflectance Film, two reflect intermembranous formation FP chamber.

The optical fibre Fabry-perot electric-field sensor measured for electrostatic field the most according to claim 1, its feature exists In, hollow hemisphere (1) uses polypropylene material, and its outer radius is 12.7mm, and inside radius is 11.5mm.

The optical fibre Fabry-perot electric-field sensor measured for electrostatic field the most according to claim 1, its feature exists In, the radius in quartz column (2) cross section is 1.05mm, a length of 30mm.

The optical fibre Fabry-perot electric-field sensor measured for electrostatic field the most according to claim 1, its feature exists In, the radius in quartz rod (3) cross section is 1.05mm, a length of 30mm.

The optical fibre Fabry-perot electric-field sensor measured for electrostatic field the most according to claim 1, its feature exists In, a diameter of 10mm of quartz thin slice (5), thickness is 60 μm, and surface is coated with the reflectance coating that reflectance is 50%.

The optical fibre Fabry-perot electric-field sensor measured for electrostatic field the most according to claim 1, its feature exists In, a diameter of 4.13mm of optical fiber collimator (7) end face, end face is coated with the reflectance coating that reflectance is 50%, and Insertion Loss is 0.3dB.