CN207601152U - It is a kind of to have from the fiber gratings of temperature characteristics is straight, ac sensor - Google Patents
It is a kind of to have from the fiber gratings of temperature characteristics is straight, ac sensor Download PDFInfo
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- CN207601152U CN207601152U CN201721861115.5U CN201721861115U CN207601152U CN 207601152 U CN207601152 U CN 207601152U CN 201721861115 U CN201721861115 U CN 201721861115U CN 207601152 U CN207601152 U CN 207601152U
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Abstract
Have the utility model discloses a kind of from the fiber gratings of temperature characteristics is straight, ac sensor, belong to technical field of optical fiber sensing, including the iron core being arranged in coil, coil and iron core form electromagnetic coil；Coil is respectively connected with coil current input fixing end, coil current input mobile terminal, and coil current input mobile terminal is connected with mobile terminal guide rail, after protection shell is pierced by the top of the guide rail of mobile terminal, the top setting range adjustable knob of guide rail in mobile terminal.The utility model adjusts mobile terminal guide rail by range adjustable knob, mobile terminal guide rail drives the mobile end motion of coil current input and then changes the effective turn for being measured access iron core and coil composition electromagnetic coil, change and magnetic field size is caused by the function of current inside electromagnetic coil, so that fiber-optic grating sensor has from temperature compensation characteristic, it can realize the DC measurement in distinguishable direction and the measurement of alternating current amplitude frequency, and its measuring range can be adjusted.
Description
Technical field
The utility model belongs to technical field of optical fiber sensing, and in particular to it is a kind of have from the fiber gratings of temperature characteristics it is straight,
Ac sensor.
Background technology
Optical fiber grating sensing is because of characteristic possessed by itself, and size is small, light-weight, electromagnetism interference, and durability is good etc.
Particular advantages are used widely in multiple engineering fields such as aerospace, bridge construction, giant mechanical and electrical equipment and are played again
It acts on.
However, fiber-optic grating sensor is chiefly used in realizing such as temperature, strain, displacement, the survey of the tested parameter of pressure at present
Amount, can realize that the report in terms of cross, straight current measurement is relatively fewer simultaneously.
In the prior art, a kind of optical fiber grating temperature self-compensating current sensor (CN201210280873), fiber grating
Temperature self-compensation current sensor (CN201310347895), fiber grating AC current sensor (CN201410198128),
Realize current measurement fashion can not achieve the measurement of current direction, and measuring range cannot still be adjusted, this cause its
There is certain limitation in terms of a wide range of current measurement.
Utility model content
Purpose of utility model：The purpose of this utility model is to provide it is a kind of have from the fiber gratings of temperature characteristics it is straight, hand over
Flow sensor has the DC measurement that distinguishable direction can be realized from temperature compensation characteristic and the measurement of alternating current amplitude frequency,
And its measuring range can be adjusted.
Technical solution：To realize above-mentioned purpose of utility model, the utility model adopts the following technical solution：
It is a kind of to have from the fiber gratings of temperature characteristics is straight, ac sensor, including the iron core being arranged in coil, coil and
Iron core forms electromagnetic coil；The coil is respectively connected with coil current input fixing end, coil current input mobile terminal, line
Loop current input mobile terminal is connected with mobile terminal guide rail, after protection shell is pierced by the top of the guide rail of mobile terminal, in mobile terminal guide rail
Top setting range adjustable knob；Wherein, fixed component and permanent magnetism are equipped at the top and bottom of the electromagnetic coil
Iron, permanent magnet are respectively connected with by fixed component and the first equi intensity cantilever and the second equi intensity cantilever；Described first
Equi intensity cantilever is connected with the first core sensing element fiber grating；Second equi intensity cantilever and the second core is quick
Sensing unit fiber grating is connected.
The coil current input fixing end is connected with the first current input terminal；The coil current input mobile terminal
It is connected with the second current input terminal.
First current input terminal and the second current input terminal is arranged on the same side of sensor protecting case；First
Current input terminal and the second current input terminal are respectively connected with electric current input pin hole.
The first core sensing element fiber grating and the second core sensing element fiber grating respectively passes through light
Fine tail optical fiber is connected with optical fiber fairlead.
The optical fiber pigtail is connected after being pierced by optical fiber fairlead with the optical fibre interrogation instrument of peripheral hardware.
The iron core is connected by coil fixing bracket with sensor protecting case.
The mobile terminal guide rail is fixed on by range adjustable knob stent on iron core.
The protection shell is connected with sensor fixing hole.
The sensor fixing hole is two or more.
Advantageous effect：Compared with prior art, the utility model drives the first grade strong under the action of magnetic field and permanent magnet
Degree cantilever beam and the first equi intensity cantilever free end amount of deflection change, and then generate surface strain, cause the first core quick
Sensing unit fiber grating and the second core sensing element fiber bragg grating center wavelength drift about；It is adjusted by range adjustable knob
Mobile terminal guide rail, mobile terminal guide rail, which drives the mobile end motion of coil current input and then changes, is measured access iron core and coil group
Into the effective turn of electromagnetic coil, change and magnetic field size is caused by the function of current inside electromagnetic coil, so as to fulfill sensing tolerance
Journey is adjusted；Above so that fiber-optic grating sensor has from temperature compensation characteristic, the DC measurement and friendship in distinguishable direction can be realized
The measurement of current amplitude frequency is flowed, and its measuring range can be adjusted.
Description of the drawings
Fig. 1 is that this has from the fiber gratings of temperature characteristics is straight, structure diagram of ac sensor；
Fig. 2 is that equi intensity cantilever acts on schematic diagram with coil；
Fig. 3 is the vertical view of equi intensity cantilever.
Specific embodiment
The utility model is described further with specific implementation example below in conjunction with the accompanying drawings.
As shown in Figs. 1-3, it is a kind of to have from the fiber gratings of temperature characteristics is straight, ac sensor, including coil 1, iron core 2,
Coil fixing bracket 3, coil current input fixing end 4, coil current input mobile terminal 5, range adjustable knob stent 6, movement
Hold guide rail 7, range adjustable knob 8, the first current input terminal 9, the second current input terminal 10, fixed component 11, permanent magnet 12, the
One core sensing element fiber grating 13, the first equi intensity cantilever 14, second core sensing element fiber grating 15, second etc.
Intensity cantilever beam 16, optical fiber pigtail 17, optical fiber fairlead 18, electric current input pin hole 19, sensor fixing hole 20 and protection are outer
Shell 21.
Iron core 2 is placed in coil 1, and iron core 2 is connected by coil fixing bracket 3 with sensor protecting case 21, coil 1 and
Iron core 2 forms electromagnetic coil, and Induced magnetic field is generated in the case where being measured the function of current；Coil 1 inputs fixing end with coil current
4th, coil current input mobile terminal 5 is respectively connected with, and coil current input fixing end 4 is connected with the first current input terminal 9；Coil electricity
Stream input mobile terminal 5 is connected with the second current input terminal 10；Coil current input mobile terminal 5 is connected simultaneously with mobile terminal guide rail 7；
Mobile terminal guide rail 7 is fixed on by range adjustable knob stent 6 on iron core 2, and the top of mobile terminal guide rail 7 is pierced by protection shell
21；Range adjustable knob 8 is arranged on the top of mobile terminal guide rail 7, realizes that coil current input moves for adjusting mobile terminal guide rail 7
The movement of moved end 5.
Fixed component 11 and permanent magnet 12 are equipped at the top and bottom of electromagnetic coil, permanent magnet 12 passes through fixed component
11 are respectively connected with the first equi intensity cantilever 14 and the second equi intensity cantilever 16；First core sensing element fiber grating 13
It is connected with the first equi intensity cantilever 14；Second core sensing element fiber grating 15 is connected with the second equi intensity cantilever 16.
First core sensing element fiber grating 13 and the second core sensing element fiber grating 15 respectively pass through optical fiber
Tail optical fiber 17 is connected with optical fiber fairlead 18, and optical fiber pigtail 17 is connected after being pierced by optical fiber fairlead 18 with optical fibre interrogation instrument, optical fiber solution
Instrument is adjusted to realize the demodulation of fiber grating signal.
First current input terminal 9 and the second current input terminal 10 are arranged on the same side of sensor protecting case 21；First
9 and second current input terminal 10 of current input terminal is connected with electric current input pin hole 19；Sensor fixing hole 20 and protection shell
21 are connected.
Sensor fixing hole 20 is two or more.
1 electric current input coil electric current of coil input mobile terminal 5 can realize that electromagnetic coil has in the case where being measured the function of current
Imitate the adjusting of the electromagnetic coil number of turn；Range adjustable knob stent 6 is mainly used to realize the support of mobile terminal guide rail 7；It leads mobile terminal
Rail 7 is mainly used to limit coil current input 5 motion track of mobile terminal, realizes its code-on-demand migration；Range adjustable knob stent 6 is led
To be used for adjusting mobile terminal guide rail 7, and then realize the movement of coil current input mobile terminal 5, realize that transducer range is adjustable
Target；First current input terminal 9, the second current input terminal 10 with coil current input fixing end 4, coil current with inputting respectively
Mobile terminal 5 is connected；The main realization permanent magnet 12 of fixed component 11 is mechanically fixed with equi intensity cantilever；Permanent magnet 12 and electromagnetism
Coil Induced magnetic field interacts, and generates external forces so as to fulfill the first equi intensity cantilever 14 and the second equal strength cantilever
The amount of deflection variation of 16 free end of beam, strain is generated on its surface, and then change the first core sensing element fiber grating 13, second
The centre wavelength of core sensing element fiber grating 15；Permanent magnet 12, which acts on, to be to realize using the effect of itself gravity
First equi intensity cantilever 14 and the second equi intensity cantilever 16 have small amount of deflection when not being measured electric current, realize first
The pre-stretching of core sensing element fiber grating 13, the second core sensing element fiber grating 15, effectively avoids sensor from detecting
Dead zone；First core sensing element fiber grating 13, the second core sensing element fiber grating 15 can be measured electric current with inverting
While measurement, it can make sensor that there is the characteristic of temperature self-compensation；First equi intensity cantilever 14 and the second equal strength cantilever
Beam 16 mainly realizes that the intermolecular forces of 12 magnetic coil Induced magnetic field of permanent magnet and the first core are quick by the variation of its surface strain
Modulation between sensing unit fiber grating 13, the drift of 15 centre wavelength of the second core sensing element fiber grating；Optical fiber pigtail 17
And optical fiber fairlead 18 mainly realizes that the first core sensing element fiber grating 13, the second core sensing element fiber grating 15 are believed
Number output, be easy to implement the networking of sensor；Mainly realize first the 9, second electricity of current input terminal in electric current input pin hole 19
Flow the fixation of input terminal 10；Sensor fixing hole 20 mainly facilitates sensor fixation in use；The sensor not only has
Temperature compensation from temperature compensation characteristic, can realize the DC measurement in distinguishable direction, and can realize the measurement of alternating current.
The sensor specific workflow is as follows：
1) it is measured electric current and sensor internal is entered by the first current input terminal 9 and the input of the second current input terminal 10
Coil current inputs fixing end 4 and coil current input mobile terminal 5；
2) magnetic field is generated inside the electromagnetic coil formed in electromagnetic action lower core 2 and coil 1；
3) the first equi intensity cantilever 14 and the first equi intensity cantilever 14 are driven under the action of magnetic field and permanent magnet 12
Free end amount of deflection changes, and then generates surface strain, leads to the first core sensing element fiber grating 13 and the second core
15 centre wavelength of sensing element fiber grating is drifted about；
4) mobile terminal guide rail 7 is adjusted by range adjustable knob 8, mobile terminal guide rail 7 drives coil current input mobile terminal 5
It moves and then changes the effective turn for being measured access iron core 2 and the composition electromagnetic coil of coil 1, change inside electromagnetic coil by electricity
Stream effect causes magnetic field size, is adjusted so as to fulfill transducer range.
First, DC measurement process
When measured DC current inputs, it is assumed that electric current is flowed by the first current input terminal 9, the second current input terminal 10
Outflow, the Induced magnetic field top for understanding to generate in the electromagnetic coil formed in iron core and coil by Ampere's law is N, lower part S.
According to the magnetic pole principle that identical charges repel each other, there is a natural attraction between the sexes, the first equi intensity cantilever 14 can be obtained by Fig. 2 analyses at this time and the second grade is strong
It is suffered upward by electromagnetic coil Induced magnetic field and magnetic fields force direction that permanent magnet interaction generates to spend cantilever beam 16.This
When, 13 tension of the first core sensing element fiber grating, centre wavelength is drifted about to long wavelength；Second core sensing element optical fiber
Grating 15 is pressurized, and centre wavelength is drifted about to short wavelength.
Assuming that electric current is flowed by the second current input terminal 10, the first current input terminal 9 flows out, understood by Ampere's law in iron
Core and the Induced magnetic field top generated in the electromagnetic coil of coil composition are S, lower part N.According to magnetic pole, identical charges repel each other, different in nature phase
The principle of suction can obtain the first equi intensity cantilever 14 by Fig. 2 analyses at this time and the second equi intensity cantilever 16 is suffered by electromagnetic wire
Circle Induced magnetic field and the magnetic fields force direction that permanent magnet interaction generates are downward.At this point, the first core sensing element optical fiber
Grating 13 is pressurized, and centre wavelength is drifted about to short wavelength；Second core sensing element fiber grating, 15 tension, centre wavelength to
Long wavelength drifts about.
To sum up analysis can obtain：With the difference in measured DC input and output direction, the first core sensing element optical fiber
The drift bearing of 13 and second core sensing element fiber grating of grating, 15 centre wavelength is different.Therefore it is straight when being measured electric current
It, can be according to the drift of 15 centre wavelength of the first core sensing element fiber grating 13 and the second core sensing element fiber grating during stream
That moves direction determining DC current flows through direction.
Assuming that tested when electric current I is flowed by the first current input terminal 9, the second current input terminal 10 flows out, equal strength cantilever
Magnetic force suffered by beam is F, is represented by：
F=kg (IN) B (1)
In formula, N is connected to the effective turn in sensor measurement circuit for electromagnetic coil (iron core, coil), and g (x) represents electricity
Function between magnetic coil Induced magnetic field and effective turn, B represent the magnetic field intensity of permanent magnet, and k represents Induced magnetic field and permanent magnetism
The coefficient of power is acted between body magnetic field.After the fiber grating AC and DC sensor associated materials and geometric parameter determine,
G (x), B, k are known quantity.
It is obtained by material mechanics principle, the surface of the first equi intensity cantilever 14 should mark ε at this time1For：
L is the length of the beam of uniform strength in formula, and E is the elasticity modulus of material, and h is beam of uniform strength thickness, and W consolidates for the beam of uniform strength
Fixed end width.Similarly, the surface of the first equi intensity cantilever 14 should mark ε2For
First core sensing element fiber grating 13 and the second core can be obtained by fiber laser arrays basic principle and above-mentioned analysis
The drift delta λ of the centre wavelength of sensing element fiber grating 151With Δ λ2For：
Δλ1=Kεε1+(ξ+a)ΔT1 (5)
Δλ2=-Kεε2+(ξ+a)ΔT2 (6)
In formula, Δ T be bragg wavelength variable quantity, KεFor the sensitivity of grating strain, ξ is fiber grating thermo-optical coeffecient, α
Coefficient of thermal expansion for optical fiber.Due to the first core sensing element fiber grating 13 and the second core sensing element fiber grating 15
In the same temperature field, therefore Δ T1=Δ T2.Simultaneous formula (3)~(6) can obtain：
Δ λ=Δ λ1-Δλ2=12Kε·L/(EWh2)·k·g(I·N)·B (7)
Analysis mode (7) can obtain, after the fiber grating AC and DC sensor material and geometric parameter determine, the first core
13 and second core sensing element fiber grating of sensing element fiber grating, 15 centre wavelength drift difference is only returned with sensor measurement
Function related the effective turn N on road and measured electric current I, it is temperature independent.It is moved by rotating range adjustable knob to adjust
Moved end guide rail, and then realize the movement of coil current input mobile terminal, so as to change effective circle in sensor measurement circuit
The size of number N.
To sum up analysis can obtain, which has from temperature compensation characteristic, can not only realize tested
The measurement of DC current size flow direction is measured, and the measurement of sensor measurement range can be realized by range adjustable knob.
2nd, AC measurment process
Assuming that tested alternating current is I (f), magnetic force suffered by equi intensity cantilever is F, is represented by：
F (f)=kg (I (f) N) B (8)
In formula, I is the amplitude of alternating current, and f is the change frequency of alternating current, and N connects for electromagnetic coil (iron core, coil)
The effective turn in sensor measurement circuit is connected on, g (x) represents the function between electromagnetic coil Induced magnetic field and effective turn, B tables
Show the magnetic field intensity of permanent magnet, k represents to act the coefficient of power between Induced magnetic field and magnetic field of permanent magnet.When the fiber grating
After AC and DC sensor associated materials and geometric parameter determine, g (x), B, k are known quantity.
It is obtained by material mechanics principle, the surface of the first equi intensity cantilever 14 should mark ε at this time1For：
L is the length of the beam of uniform strength in formula, and E is the elasticity modulus of material, and h is beam of uniform strength thickness, and W consolidates for the beam of uniform strength
Fixed end width.Similarly, the surface of the first equi intensity cantilever 14 should mark ε2For
First core sensing element fiber grating 13 and the second core can be obtained by fiber laser arrays basic principle and above-mentioned analysis
The drift delta λ of the centre wavelength of sensing element fiber grating 151(f) with Δ λ2(f) it is：
Δλ1(f)=Kεε1(f)+(ξ+a)ΔT1 (11)
Δλ2(f)=- Kεε2(f)+(ξ+a)ΔT2 (12)
In formula, Δ T be bragg wavelength variable quantity, KεFor the sensitivity of grating strain, ξ is fiber grating thermo-optical coeffecient, α
Coefficient of thermal expansion for optical fiber.Due to the place of the first core sensing element fiber grating 13 and core sensing element fiber grating 2
In same temperature field, therefore Δ T1=Δ T2.Simultaneous formula (9)~(12) can obtain：
Δ λ (f)=Δ λ1(f)-Δλ2(f)=12Kε·L/(EWh2)·k·g(I(f)·N)·B (13)
Analysis mode (13) can obtain, after the fiber grating AC and DC sensor material and geometric parameter determine, the first core
13 and second core sensing element fiber grating of sensing element fiber grating, 15 centre wavelength drift about spread value and frequency only with biography
The effective turn N of sensor measuring loop and the related function of measured electric current I (f), it is temperature independent.It is adjustable by rotating range
Knob adjusts mobile terminal guide rail, and then realize the movement of coil current input mobile terminal, so as to change sensor measurement
The size of the effective turn N in circuit.
It can be obtained by the above-mentioned fiber grating AC and DC sensor DC measurement, the analysis of AC measurment implementation process, this reality
Have with novel involved fiber-optic grating sensor from temperature compensation characteristic, can realize the DC measurement and exchange in distinguishable direction
The measurement of current amplitude frequency, and its measuring range can be adjusted.
Claims (9)
1. a kind of have from the fiber gratings of temperature characteristics is straight, ac sensor, it is characterised in that：Including being arranged in coil (1)
Iron core (2), coil (1) and iron core (2) composition electromagnetic coil；The coil (1) and coil current input fixing end (4),
Coil current input mobile terminal (5) is respectively connected with, and coil current input mobile terminal (5) is connected with mobile terminal guide rail (7), mobile terminal
After protection shell (21) is pierced by the top of guide rail (7), the top setting range adjustable knob (8) of guide rail (7) in mobile terminal；Its
In, fixed component (11) and permanent magnet (12) are equipped at the top and bottom of the electromagnetic coil, permanent magnet (12) passes through
Fixed component (11) is respectively connected with the first equi intensity cantilever (14) and the second equi intensity cantilever (16)；Described first etc.
Intensity cantilever beam (14) is connected with the first core sensing element fiber grating (13)；Second equi intensity cantilever (16) with
Second core sensing element fiber grating (15) is connected.
A kind of have 2. according to claim 1 from the fiber gratings of temperature characteristics is straight, ac sensor, it is characterised in that：
The coil current input fixing end (4) is connected with the first current input terminal (9)；The coil current input mobile terminal
(5) it is connected with the second current input terminal (10).
A kind of have 3. according to claim 2 from the fiber gratings of temperature characteristics is straight, ac sensor, it is characterised in that：
First current input terminal (9) and the second current input terminal (10) is arranged on the same side of sensor protecting case (21)；
First current input terminal (9) and the second current input terminal (10) are respectively connected with electric current input pin hole (19).
A kind of have 4. according to claim 1 from the fiber gratings of temperature characteristics is straight, ac sensor, it is characterised in that：
The first core sensing element fiber grating (13) and the second core sensing element fiber grating (15) respectively passes through light
Fine tail optical fiber (17) is connected with optical fiber fairlead (18).
A kind of have 5. according to claim 4 from the fiber gratings of temperature characteristics is straight, ac sensor, it is characterised in that：
The optical fiber pigtail (17) is pierced by optical fiber fairlead (18) and is connected afterwards with the optical fibre interrogation instrument of peripheral hardware.
A kind of have 6. according to claim 1 from the fiber gratings of temperature characteristics is straight, ac sensor, it is characterised in that：
The iron core (2) is connected by coil fixing bracket (3) with sensor protecting case (21).
A kind of have 7. according to claim 1 from the fiber gratings of temperature characteristics is straight, ac sensor, it is characterised in that：
The mobile terminal guide rail (7) is fixed on by range adjustable knob stent (6) on iron core (2).
A kind of have 8. according to claim 1 from the fiber gratings of temperature characteristics is straight, ac sensor, it is characterised in that：
The protection shell (21) is connected with sensor fixing hole (20).
A kind of have 9. according to claim 8 from the fiber gratings of temperature characteristics is straight, ac sensor, it is characterised in that：
The sensor fixing hole (20) is two or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721861115.5U CN207601152U (en) | 2017-12-27 | 2017-12-27 | It is a kind of to have from the fiber gratings of temperature characteristics is straight, ac sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721861115.5U CN207601152U (en) | 2017-12-27 | 2017-12-27 | It is a kind of to have from the fiber gratings of temperature characteristics is straight, ac sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108107253A (en) * | 2017-12-27 | 2018-06-01 | 盐城工学院 | It is a kind of to have from the fiber gratings of temperature characteristics is straight, ac sensor |
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2017
- 2017-12-27 CN CN201721861115.5U patent/CN207601152U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108107253A (en) * | 2017-12-27 | 2018-06-01 | 盐城工学院 | It is a kind of to have from the fiber gratings of temperature characteristics is straight, ac sensor |
| CN108107253B (en) * | 2017-12-27 | 2023-09-08 | 盐城工学院 | Fiber bragg grating direct-current and alternating-current sensor with self-temperature characteristic |
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Granted publication date: 20180710 Termination date: 20211227 |