CN204086507U - Based on the low-intensity magnetic field one-way optical fiber grating sensor of magnetostriction materials - Google Patents
Based on the low-intensity magnetic field one-way optical fiber grating sensor of magnetostriction materials Download PDFInfo
- Publication number
- CN204086507U CN204086507U CN201420519597.6U CN201420519597U CN204086507U CN 204086507 U CN204086507 U CN 204086507U CN 201420519597 U CN201420519597 U CN 201420519597U CN 204086507 U CN204086507 U CN 204086507U
- Authority
- CN
- China
- Prior art keywords
- fiber grating
- magnetic field
- magnetostriction materials
- low
- intensity magnetic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Abstract
The utility model discloses the low-intensity magnetic field one-way optical fiber grating sensor based on magnetostriction materials, comprise primary coil, primary coil is connected with secondary coil by voltage amplifier circuit, the induced voltage that voltage amplifier circuit is used for primary coil to produce amplifies, the center of secondary coil is placed with the known magnetostriction materials block of form parameter, and magnetostriction materials block is placed with fiber grating.Primary coil, voltage amplifier circuit, secondary coil mainly realize the amplification of external electromagnetic field amplitude, are convenient to the detection that sensor realizes extraneous low-intensity magnetic field.The utility model is applicable to the measurement of the light current magnetic under humidity, the strong environment of electromagnetic interference (EMI).
Description
Technical field
The utility model relates to the low-intensity magnetic field one-way optical fiber grating sensor based on magnetostriction materials.
Background technology
It is little that fiber-optic grating sensor has size, lightweight, electromagnetism interference, the advantage that reusability waits well other type sensor not possess, and development in recent years is rapid, and various optical fiber grating sensing product obtains exploitation and widespread use.But the anti-electromagnetic-radiation interference characteristic of fiber grating itself greatly limit it in magnetic field, the development particularly in weak magnetic measurement.Chinese patent CN103163493A realizes the measurement of external magnetic field by the corresponding relation between the variable quantity of the side mode suppression ratio of measuring optical fiber Bragg grating and the variable quantity of external magnetic field.But this invention relates to pouring into of magnetic fluid kapillary, be subject to the interference of bias light noise when operating more difficult control and the demodulation of fiber grating side mode suppression ratio, therefore this invention also exists certain binding character in weak magnetic measurement.
Utility model content
For solving the deficiency that prior art exists, the utility model discloses the low-intensity magnetic field one-way optical fiber grating sensor based on magnetostriction materials, the same frequency amplitude that first the present invention realizes extraneous low-intensity magnetic field by voltage amplifier circuit, primary coil, secondary coil is amplified; The conversion of corresponding relation between external electromagnetic field and optic fiber grating wavelength is realized again by magnetostriction materials; Eventually through the measurement inverting of optic fiber grating wavelength being realized extraneous low-intensity magnetic field.This invention is applicable to humidity, the strong environment of electromagnetic interference (EMI), realizes the measurement of low-intensity magnetic field.
For achieving the above object, concrete scheme of the present utility model is as follows:
Based on the low-intensity magnetic field one-way optical fiber grating sensor of magnetostriction materials, comprise primary coil, primary coil is connected with secondary coil by voltage amplifier circuit, the induced voltage that voltage amplifier circuit is used for primary coil to produce amplifies, the center of secondary coil is placed with magnetostriction materials block, and magnetostriction materials block is placed with fiber grating.
Described fiber grating is sensitive element fiber grating.
The tail optical fiber that described fiber grating comprises fiber grating body and is connected with fiber grating body.
Described voltage amplifier circuit, secondary coil, magnetostriction materials block and fiber grating body are all placed in electromagnetic shielding box.
The magnetostriction materials block that described form parameter is known, material block is rectangular shape and its magnetostriction coefficient is known.
Principle of work: voltage amplifier circuit realizes primary coil because affecting the amplification of produced induced voltage by external magnetic field.Voltage after amplification acts on secondary coil thus realizes the same frequency amplitude amplification of extraneous low-intensity magnetic field.Measurand because of this invention is low-intensity magnetic field, and therefore electromagnetic shielding box is not mainly for the protection of secondary coil, voltage amplifier circuit, magnetostriction materials block by the interference of external electromagnetic radiation, improves the accuracy of detection of this invention.Set up the corresponding relation of magnetic field and fiber bragg grating center wavelength with the character that external electromagnetic field change material itself can produce certain deformation based on magnetostriction materials itself.By analyzing fiber bragg grating center wavelength, Inversion Calculation obtains amplitude and the frequency information of extraneous low-intensity magnetic field.
By the definition of coil effective flux, magnetic flux=BScos α, wherein α is the angle between external magnetic field direction and coil axis.Magnetic flux when external magnetic field is vertical with primary coil axial direction by primary coil is maximum, and then realizes the selection of extraneous tested magnetic direction.
Voltage amplifier circuit is mainly used to amplify primary coil because affecting produced induced voltage by external magnetic field.Primary coil induced voltage after being amplified by voltage amplifier circuit is acted on secondary coil and to produce with external magnetic field with frequently but the larger electromagnetic field of amplitude and primary coil, voltage amplifier circuit, secondary coil mainly realize the amplification of external electromagnetic field amplitude, is convenient to the detection that sensor realizes extraneous low-intensity magnetic field.
Electromagnetic shielding box is not subject to the impact of external electromagnetic radiation mainly for the protection of voltage amplifier circuit, secondary coil, magnetostriction materials block.Magnetostriction materials block is mainly for generation of strain value corresponding caused by secondary coil changes of magnetic field.
The beneficial effects of the utility model:
This sensor mainly amplifies the voltage of the extraneous electromagnetism place generation of primary coil impression by voltage amplifier circuit based on magnetic field induction law.Original edge voltage after amplification produces with tested magnetic field with high-intensity magnetic field signal frequently at secondary coil, and then by the fiber grating characteristic obtained because of magnetostriction materials itself obtain because of its place environmental magnetic field change caused by the strain of material, thus the change of setting up between extraneous low-intensity magnetic field and optic fiber grating wavelength, the information of extraneous low-intensity magnetic field is obtained eventually through inverting.The present invention is applicable to the measurement of the light current magnetic under humidity, the strong environment of electromagnetic interference (EMI).
Accompanying drawing explanation
Fig. 1 is the module diagram of the low-intensity magnetic field one-way optical fiber grating sensor based on magnetostriction materials;
In figure: 1-primary coil, 2-voltage amplifier circuit, 3-secondary coil, 4-electromagnetic shielding box, 5-magnetostriction materials block, 6-fiber grating, 7-tail optical fiber.
Embodiment:
Below in conjunction with accompanying drawing, the utility model is described in detail:
As shown in Figure 1, a kind of novel low-intensity magnetic field one-way optical fiber grating sensor based on magnetostriction materials mainly comprises primary coil 1, secondary coil 3, voltage amplifier circuit 2, electromagnetic shielding box 4, magnetostriction materials block 5 and sensitive element fiber grating 6.
Based on the villari effect of magnetostriction materials itself, sensitive element fiber grating 6 is mainly used in setting up grating wavelength λ
bwith magnetostriction materials strain stress
magneticbetween the relation of correspondence.This corresponding relation of inverting, this sensor realizes the measurement of extraneous low-intensity magnetic field.
In formula, Δ λ
bformula is the wave length shift of responsive grating, p
efor the valid elastic-optic constants of grating, the scale-up factor that K (B) is magnetostriction materials and external magnetic field and relevant with external magnetic field B.
Voltage amplifier circuit 2 realizes primary coil 1 because affecting the amplification of produced induced voltage by external magnetic field.Voltage after amplification acts on secondary coil 3 thus realizes the same frequency amplitude amplification of extraneous low-intensity magnetic field.
Its corresponding relation computation process is as follows:
Primary coil 1 radius supposing this invention is r, and primary coil 1 area is S, and the number of turn is n
1, voltage amplifier circuit 2 enlargement factor is M, and secondary coil 3 resistance value is R, and the number of turn is n
2.Suppose that extraneous magnetic induction density amplitude is B
m, field frequency is f, and the induced voltage being obtained primary coil generation by law of magnetic induction is:
Former limit induced voltage is after voltage amplifier circuit 2 amplifies M times, and secondary voltage is:
U
secondary=MU
former(3)
Be that R obtains secondary coil 3 current value and is by secondary coil 3 resistance:
Produce magnetic field intensity by spiral winding center and calculate formula B=n μ
0the magnetic induction density that I can obtain the generation of secondary spiral winding center is:
B
secondary=μ
0n
2i
secondary(
5)
Illustrate as follows:
If measured extraneous magnetic induction density amplitude B
mfor 1nT, field frequency f is 100KHz; Former limit radius is 3cm, number of turn n
1be 100, substitution formula (1) can obtain former limit magnetic induction voltage and be:
U
former=4*1000*1.0*10-9*100K*3.1415926*9*10-4=1.13mV.
If the enlargement factor of voltage amplifier circuit 2 is 1000, the voltage after can amplifying is:
U
secondary=1000*E12=1.13V.
The resistivity of known copper cash is 0.0175 Ω mm
2/ m, assuming that secondary copper wire diameter is 0.3mm, secondary spiral winding radius is 4 ~ 5mm, when secondary resistance value is 1 Ω and secondary current be 1.13A, the copper cash length of needs is:
Now, the number of turn n of secondary coil
2for: n
2=16.157/ (2*3.1415926*5) * 1000=514.286.
The magnetic induction density that can be obtained the spiral winding center of secondary coil by formula (4) is:
B
secondary=μ
0n
2i
secondary=4 π * 10
-7* 514.286*1.13=7.30210
-4t.
That is, by voltage amplifier circuit 2, primary coil 1 and the extraneous low-intensity magnetic field of secondary coil 3 have been exaggerated nearly 10000 times.
Magnetostriction materials block 5 known for form parameter is positioned over the center of secondary coil 3, sets up the corresponding relation of magnetic field and fiber bragg grating center wavelength based on magnetostriction materials itself with the character that external electromagnetic field change material itself can produce certain deformation.Through type (1) analyzes fiber bragg grating center wavelength drift, and Inversion Calculation obtains amplitude and the frequency information of extraneous low-intensity magnetic field.
Claims (4)
1. based on the low-intensity magnetic field one-way optical fiber grating sensor of magnetostriction materials, it is characterized in that, comprise primary coil, primary coil is connected with secondary coil by voltage amplifier circuit, the induced voltage that voltage amplifier circuit is used for primary coil to produce amplifies, the center of secondary coil is placed with magnetostriction materials block, and magnetostriction materials block is placed with fiber grating.
2., as claimed in claim 1 based on the low-intensity magnetic field one-way optical fiber grating sensor of magnetostriction materials, it is characterized in that, described fiber grating is sensitive element fiber grating.
3., as claimed in claim 2 based on the low-intensity magnetic field one-way optical fiber grating sensor of magnetostriction materials, it is characterized in that, the tail optical fiber that described fiber grating comprises fiber grating body and is connected with fiber grating body.
4., as claimed in claim 3 based on the low-intensity magnetic field one-way optical fiber grating sensor of magnetostriction materials, it is characterized in that, described voltage amplifier circuit, secondary coil, magnetostriction materials block and fiber grating body are all placed in electromagnetic shielding box.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420519597.6U CN204086507U (en) | 2014-09-10 | 2014-09-10 | Based on the low-intensity magnetic field one-way optical fiber grating sensor of magnetostriction materials |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420519597.6U CN204086507U (en) | 2014-09-10 | 2014-09-10 | Based on the low-intensity magnetic field one-way optical fiber grating sensor of magnetostriction materials |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204086507U true CN204086507U (en) | 2015-01-07 |
Family
ID=52179208
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420519597.6U Expired - Fee Related CN204086507U (en) | 2014-09-10 | 2014-09-10 | Based on the low-intensity magnetic field one-way optical fiber grating sensor of magnetostriction materials |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204086507U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108413876A (en) * | 2018-02-05 | 2018-08-17 | 大连理工大学 | The measurement method of bit test is anchored in a kind of ocean ground |
| CN109932667A (en) * | 2019-04-22 | 2019-06-25 | 中国计量大学 | A kind of double magnetosensitive fibre optic magnetic field sensing probes of magnetic fluid and magnetostriction casing |
-
2014
- 2014-09-10 CN CN201420519597.6U patent/CN204086507U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108413876A (en) * | 2018-02-05 | 2018-08-17 | 大连理工大学 | The measurement method of bit test is anchored in a kind of ocean ground |
| CN108413876B (en) * | 2018-02-05 | 2019-08-13 | 大连理工大学 | The measurement method of bit test is anchored in a kind of ocean ground |
| CN109932667A (en) * | 2019-04-22 | 2019-06-25 | 中国计量大学 | A kind of double magnetosensitive fibre optic magnetic field sensing probes of magnetic fluid and magnetostriction casing |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104155619B (en) | Based on magnetostriction distribution probe beam deflation magnetic field sensing device and demodulation method | |
| CN205139229U (en) | Huge magnetoresistive effect current sensor | |
| CN103399191B (en) | FBG-GMM electric current sensing method based on sideband demodulation | |
| CN203287311U (en) | Double-cone fine-core single mode fiber based transmission-type optical fiber humidity sensor | |
| CN205210163U (en) | Huge magnetoresistive effect current sensor | |
| CN101509962B (en) | Magnetic induction measurement method and apparatus | |
| WO2014001807A3 (en) | Fibre optic sensing | |
| CN104316106A (en) | Optical fiber sensor based on Mach-Zehnder interference and fiber bragg grating | |
| CN105571619B (en) | A kind of FBG sensor sensitivity improvement methods based on cantilever beam structure | |
| CN104198789B (en) | A kind of optical fiber current mutual inductor based on magnetostrictive effect | |
| CN204086507U (en) | Based on the low-intensity magnetic field one-way optical fiber grating sensor of magnetostriction materials | |
| CN103760504B (en) | A kind of optical fiber Bragg raster space magnetic field intensity sensor based on giant magnetostrictive material and using method thereof | |
| CN103245819A (en) | Method for measuring direct current or direct voltage by adopting magnetic excitation resonant piezoresistive cantilever beam | |
| CN103281042B (en) | Remote transmission IEPE type charge amplifier | |
| CN104062363A (en) | Double fiber bragg grating sensor for rock bolt anchoring quality test | |
| CN202033405U (en) | Current measuring device | |
| CN104849688B (en) | Pulsed E field measurement system signal injects scaling method | |
| CN203224440U (en) | Humidity sensor based on multimode interference MSM (multilayer switch module) structure | |
| CN105423944B (en) | A kind of distribution type fiber-optic curvature sensor | |
| CN102620861B (en) | Scaling temperature measuring device in distributed optical fiber temperature sensor | |
| CN209085724U (en) | High-accuracy liquid level sensor | |
| CN102261978A (en) | Method and device for implementing hydraulic pressure sensing based on twin-core and twin-hole optical fiber | |
| CN204945221U (en) | Based on the voltage measuring apparatus of fiber grating sensing technology | |
| CN109459601A (en) | A kind of fiber Bragg grating current sensor based on magnetic field gradient power | |
| CN203672333U (en) | Curvature sensor based on waist-enlarged welding fiber grating |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150107 Termination date: 20160910 |