CN110412486A - The optics hollow pipe cavity magnetic field sensing system that optimum sensitivity frequency location is tunable - Google Patents
The optics hollow pipe cavity magnetic field sensing system that optimum sensitivity frequency location is tunable Download PDFInfo
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- CN110412486A CN110412486A CN201910619663.4A CN201910619663A CN110412486A CN 110412486 A CN110412486 A CN 110412486A CN 201910619663 A CN201910619663 A CN 201910619663A CN 110412486 A CN110412486 A CN 110412486A
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- magnetic field
- hollow pipe
- pipe cavity
- tunable
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/032—Measuring direction or magnitude of magnetic fields or magnetic flux using magneto-optic devices, e.g. Faraday or Cotton-Mouton effect
- G01R33/0327—Measuring direction or magnitude of magnetic fields or magnetic flux using magneto-optic devices, e.g. Faraday or Cotton-Mouton effect with application of magnetostriction
Abstract
The invention proposes a kind of optics hollow pipe cavity magnetic field sensing system that optimum sensitivity frequency location is tunable, the two paths of signals of signal generator output of the invention is sent into the voltage tuning port of tunable laser all the way, is sent into oscillograph all the way.The transmitting terminal of tunable laser and the input terminal of attenuator connect, and are provided with Polarization Controller on the optical fiber between the output end and optical taper input terminal of attenuator.The light field of optical taper output enters in hollow pipe cavity in such a way that evanescent wave couples, intracavitary light field can also be by optical taper coupling output to the receiving end of photodetector, the DC signal component of photodetector output enters oscillograph through BiasTee, and AC signal component is sent into spectrometer/Network Analyzer through beam splitter and is shown.The present invention has the advantages of highly sensitive, optimum sensitivity look-in frequency is tunable, detectable AC/DC magnetic field, low cost, low-power consumption, electromagnetism interference.
Description
Technical field
The present invention relates to a kind of external driving optics hollow pipe cavity magnetic fields that optimum sensitivity frequency location is tunable
Sensor-based system, and in particular to be the magnetic field sensing system constructed by magnetostriction medium and optics hollow pipe cavity, belong to optics
Field.
Background technique
The superconducting quantum interference device that the means of current atomic weak magnetic measurement mainly work at low temperature, the work of low temperature
Keep its bulky as condition, is not suitable for being constantly needed to mobile occasion, and cost is high.It is most emerging to be based on optical resonance
The application of the magnetometer of chamber is still limited by its sensitivity and look-in frequency range, due to the alternating magnetic field of this type magnetometer
The frequency location of detection optimum sensitivity is corresponding with its mechanical mode, so after the structure and material of resonant cavity is fixed,
The frequency location of optimum sensitivity is fixed, and this frequency location and the field frequency of actual needs detection may be different
It causes, causes the application of device limited.We have proposed a kind of external driving novel magnetic field detection side based on optics hollow pipe cavity
Case is not only expected to promote sensing sensitivity, can also tune the frequency location of its optimum sensitivity, actually answers to obtain to meet
Magnetic field sensing system, while the system also has both low cost and the advantages of low-power consumption, future may directly apply to faint
Detection of magnetic field field.In addition, it can also be integrated in fibre system, not by electromagnetic interference and can carry out remote probe.
Summary of the invention
In view of the deficiencies of the prior art, the present invention proposes a kind of external drivings that optimum sensitivity frequency location is tunable
Optics hollow pipe cavity magnetic field sensing system, can be used for Weak magentic-field field of detecting.
The optics hollow pipe cavity magnetic field sensing system that optimum sensitivity frequency location is tunable, sensor-based system include signal hair
Raw device, tunable laser, attenuator, Polarization Controller, optical taper, magnetic field sensing cell, photodetector, Bias-Tee,
Oscillograph, beam splitter, electric spectrometer, Network Analyzer, DC magnetic field source and AC magnetism field source；Magnetic field sensing cell includes that mangneto is stretched
Contracting medium, hollow pipe cavity, electrostriction medium, bracket and glue.
The two paths of signals of the signal generator output is sent into the voltage tuning port of tunable laser all the way, all the way
It is sent to oscillograph；The light exit side of tunable laser and the input terminal of attenuator connect, the output end and polarization of attenuator
The input terminal of controller connects, and the output end of Polarization Controller is connect with optical taper input terminal；The light field of optical taper output passes through
The mode of evanescent wave coupling enters in the hollow pipe cavity of magnetic field sensing cell, and light field is coupled by each optical taper in hollow pipe cavity
It exports to the receiving end of corresponding photodetector, the signal of photodetector output separates AC/DC signal through Bias-Tee, directly
It flows signal and is sent into oscilloscope display, AC signal is sent into electric spectrometer and Network Analyzer is shown.Tunable laser in sensor-based system
Device, isolator, attenuator, Polarization Controller, optical taper, the connection between photodetector are all made of optical fiber connection；Photoelectricity is visited
Survey device and Bias-Tee, Bias-Tee and oscillograph, Bias-Tee and beam splitter, beam splitter and electric spectrometer, beam splitter and network
Analyzer is connected using electricity cable；Wherein the both ends of hollow pipe cavity are fixed on one end and the electricity of magnetostriction medium by glue
One end of flexible medium is caused, contactless with frame bottom, magnetostriction medium and electrostriction medium are fixed on branch by glue
On frame.The input optical wavelength that the diameter of section of the cone area part of the optical taper is 0.5-0.9；The hollow pipe cavity and light
Fibre cone is in couple state always.Shown in tunable laser include optoisolator.
Preferably, tunable laser and attenuator paper further include isolator, the light exit side of tunable laser
It is connect with the input terminal of isolator, the output end of isolator and the input terminal of attenuator connect, the output end and polarization of attenuator
The input terminal of controller connects,
Preferably, the tuning range of the tunable laser will cover the required investigative range of experiment, wave band choosing
With communication band, and match with the receiving wave range of detector.
Preferably, the hollow pipe cavity is hollow structure, wall thickness is 1 micron -1 millimeter, and outer diameter is 100 microns -5 lis
Rice, specific wall thickness and outer diameter can be determined according to the demand of actual application medium sensitivity.
Preferably, the material of the hollow pipe cavity is the material that silica or other supported optical modes transmit.
Preferably, the hollow pipe cavity can be replaced column chamber or ampuliform chamber or air bubble-shaped chamber, as long as guaranteeing intracavitary
There are evanescent waves for the low-loss transmission of light field and chamber outer surface.
Preferably, the magnetostriction medium is that Terfenol-D or other can stretch under magnetic fields
Medium.Shape and position will guarantee the effect that can generate power to chamber under magnetic fields.
Preferably, the electrostriction medium is Jie that PZT or other can stretch under voltage or electric field action
Matter.Shape and position will guarantee the effect that can generate power to chamber under voltage or electric field action.
Preferably, the optical fiber will guarantee the low-loss transmission of optical signal in selected wave band.
Preferably, the polarization state of the Polarization Controller will guarantee the optical figure of merit highest of optical mode.
Preferably, the attenuator will guarantee to reach receivable power model of the optical power in detector of detector
In enclosing.
The frequency location that sensor-based system in the present invention can carry out high sensitivity magnetic field sensing and optimum sensitivity can be with
Tuning, is provided simultaneously with AC/DC detection of magnetic field ability.It is small in size in addition, the system is mainly constructed by optical fiber, it is easy of integration, it can be into
The remote probe of row Magnetic Field.
Detailed description of the invention
Fig. 1 is the tunable optics hollow pipe cavity magnetic field sensing system schematic of the optimum sensitivity frequency location of invention；
Specific embodiment
Below by the specific embodiment substantive distinguishing features that the present invention is furture elucidated and marked improvement, but it is of the invention
Content is not limited solely to following embodiment:
Specific embodiment 1: as shown in Figure 1, the tunable light of optimum sensitivity frequency location described in present embodiment
Learning hollow pipe cavity magnetic field sensing system includes tunable laser 1, attenuator 2, Polarization Controller 3, optical taper 4, magnetic field sensing
Unit 5, photodetector 6, Bias-Tee 7, oscillograph 8, signal generator 9, beam splitter 10, electric spectrometer 11, Network Analyzer
12, D.C. magnetic field 13, alternating current magnetic field 14.Wherein, the two paths of signals that signal generator 9 exports is sent into tunable laser 1 all the way
Voltage tuning port, be sent to oscillograph 8 all the way.The light exit side of tunable laser 1 and the input terminal of attenuator 2 connect
It connects, the output end of attenuator 2 is connect with the input terminal of Polarization Controller 3,3 output end of Polarization Controller and 4 input terminal of optical taper
Connection.The light field that optical taper 4 exports enters in the hollow pipe cavity in magnetic field sensing cell 5 in such a way that evanescent wave couples, empty
Light field can also be exported by the coupling of optical taper 4 output to the receiving end of photodetector 6, photodetector 6 in heart lumen
Signal enters Bias-Tee 7, and the direct current signal that Bias-Tee 7 is exported enters in oscillograph 8.The exchange that Bias-Tee 7 is exported
Signal, which enters in beam splitter 10, to be respectively fed in electric spectrometer 11 and Network Analyzer 12.Tunable laser 1, attenuator 2, polarization
Controller 3, optical taper 4, the connection between photodetector 6 are all made of optical fiber connection；Photodetector 6 and Bias-Tee 7,
Bias-Tee 7 and oscillograph 8, signal generator 9 and oscillograph 8, signal generator 9 and tunable laser 1, Bias-Tee
It is connected between 7 and beam splitter 10, beam splitter 10 and electric spectrometer 11, beam splitter 10 and Network Analyzer 12 using electricity cable.Directly
Stream magnetic field 13 and alternating current magnetic field 14 are used to test the magnetic field sensing performance of magnetic field sensing cell, and D.C. magnetic field 13 is external by coil
Current source, voltage source or magnet obtain, and alternating current magnetic field 14 can be obtained by coil and signal generator or Network Analyzer.
Specific embodiment 2: as shown in Figure 1, the tunable light of optimum sensitivity frequency location described in present embodiment
Learning hollow pipe cavity magnetic field sensing cell 5 includes magnetostriction medium 15, hollow pipe cavity 16, electrostriction medium 17,18 He of bracket
Glue 19.Wherein the both ends of hollow pipe cavity 16 pass through one end and electrostriction Jie that glue is fixed on magnetostriction medium 15 respectively
One end of matter 17.The bracket for then making corresponding size, by 15/ hollow pipe cavity of magnetostriction medium, 16/ electrostriction medium 17
Composite construction it is fixed on mount 18 by glue 19.
Specific embodiment 3: embodiment is described with reference to Fig. 1, present embodiment is to embodiment one and embodiment party
The supplement for the optics hollow pipe cavity magnetic field sensing system that optimum sensitivity frequency location described in formula two is tunable.External magnetic field
Variation will lead to magnetostriction medium 15, and deformation occurs, and then the chamber length of hollow pipe cavity 16 is caused to change, thus oscillograph 8
It will include D.C. magnetic field information in the transmission spectrum of the chamber of upper measurement, and then include AC magnetism on electric spectrometer 11 and Network Analyzer 12
Field information, the intensity and frequency information in magnetic field can be demodulated by data processing.By applying voltage to electrostriction medium 17
The frequency location of optimum sensitivity can be tuned.
Specific embodiment 4: embodiment is described with reference to Fig. 1, present embodiment be to described in embodiment one most
The supplement for the optics hollow pipe cavity magnetic field sensing system that good sensitivity frequency position is tunable.The sensor-based system is in addition to can be with
Outside the detection of magnetic field for carrying out single-point, it can also expand as the sensor array of multiple spot detection of magnetic field.It is needed in actual mechanical process
The device that can be divided, such as fiber coupler are added after Polarization Controller.Meanwhile in the optical taper output end of multiple sensing units
Also the photodetector for accordingly increasing corresponding number is received.In addition, the oscillograph 8 for data acquisition can also
To be substituted using data collecting card.
Specific embodiment 5: embodiment is described with reference to Fig. 1, present embodiment is to sky described in embodiment two
Heart lumen magnetic field sensing cell further limits.Hollow pipe cavity 16 could alternatively be the resonant cavity of other shapes and size, only
Guarantee that stress back cavity length changes, and the light field of light source output low-loss can be transmitted in it, while in chamber appearance
There are evanescent waves in face.The shape of magnetostriction medium 15 will guarantee the effect that can generate power to chamber under magnetic fields.It is electroluminescent
The shape of flexible medium 17 will guarantee the effect that can generate power to chamber under voltage or electric field action.Magnetostriction medium 15,
The relative position of hollow pipe cavity 16, electrostriction medium 17 and bracket 18 can change, and can be carried out according to practical application request
Design, as long as guaranteeing that chamber length can change under magnetic fields, electrostriction medium can change chamber mechanical mode frequency position
It sets.
Claims (10)
1. the optics hollow pipe cavity magnetic field sensing system that optimum sensitivity frequency location is tunable, it is characterised in that: sensor-based system
It is visited including tunable laser (1), attenuator (2), Polarization Controller (3), optical taper (4), magnetic field sensing cell (5), photoelectricity
Survey device (6), Bias-Tee (7), oscillograph (8), signal generator (9), beam splitter (10), electric spectrometer (11), Network Analyzer
(12), D.C. magnetic field (13), alternating current magnetic field (14)；
The two paths of signals of described signal generator (9) output is sent into the voltage tuning port of tunable laser (1) all the way, and one
Road is sent to oscillograph (8)；The light exit side of tunable laser (1) is connect with the input terminal of attenuator (2), attenuator (2)
Output end connect with the input terminal of Polarization Controller (3), Polarization Controller (3) output end is connect with optical taper (4) input terminal；
The light field of optical taper (4) output enters in the hollow pipe cavity in magnetic field sensing cell (5) in such a way that evanescent wave couples, hollow
Receiving end of the light field by optical taper (4) coupling output to photodetector (6) in lumen, the letter of photodetector (6) output
Number enter Bias-Tee (7), Bias-Tee (7) output direct current signal enter in oscillograph (8)；Bias-Tee (7) output
AC signal, which enters in beam splitter (10), to be respectively fed in electric spectrometer (11) and Network Analyzer (12)；Tunable laser (1),
Attenuator (2), Polarization Controller (3), optical taper (4), the connection between photodetector (6) are all made of optical fiber connection；Photoelectricity
Detector (6) and Bias-Tee (7), Bias-Tee (7) and oscillograph (8), signal generator (9) and oscillograph (8), signal are sent out
Raw device (9) and tunable laser (1), Bias-Tee (7) and beam splitter (10), beam splitter (10) and electric spectrometer (11), beam splitting
It is connect between device (10) and Network Analyzer (12) using electricity cable；D.C. magnetic field (13) and alternating current magnetic field (14) are for testing
The magnetic field sensing performance of magnetic field sensing cell, D.C. magnetic field (13) are obtained by coil external impressed current source, voltage source or magnet, are handed over
Magnetic field (14) are flowed to obtain by coil and signal generator or Network Analyzer；
Wherein magnetic field sensing cell (5) includes magnetostriction medium (15), hollow pipe cavity (16), electrostriction medium (17), branch
Frame (18) and glue (19)；Wherein hollow pipe cavity (16) both ends pass through one end that glue is fixed on magnetostriction medium (15) respectively
With one end of electrostriction medium (17)；Magnetostriction medium (15)/hollow pipe cavity (16)/electrostriction medium (17) are answered
Structure is closed to be fixed on bracket (18) by glue (19)；The diameter of section of the cone area part of the optical taper is 0.5-0.9
Input optical wavelength；The hollow pipe cavity and optical taper is in couple state always.
2. the optics hollow pipe cavity magnetic field sensing system that optimum sensitivity frequency location according to claim 1 is tunable,
It is characterized by: the tuning range of the tunable laser will cover the required investigative range of experiment, wave band selects communication
Wave band, and match with the receiving wave range of detector.
3. the optics hollow pipe cavity magnetic field sensing system that optimum sensitivity frequency location according to claim 1 is tunable,
It is characterized by: the hollow pipe cavity is hollow structure, wall thickness is from 1 micron to 1 millimeter, 100 microns to 5 centimetres of outer diameter.
4. the optics hollow pipe cavity magnetic field sensing system that optimum sensitivity frequency location according to claim 1 is tunable,
It is characterized by: the material of the hollow pipe cavity is the material that silica or other supported optical modes transmit, structure can
Column chamber or ampuliform chamber or air bubble-shaped chamber are replaced with, is suddenly died as long as guaranteeing that the low-loss transmission of intracavitary light field and chamber outer surface exist
Wave.
5. the optics hollow pipe cavity magnetic field sensing system that optimum sensitivity frequency location according to claim 1 is tunable,
It is characterized by: the magnetostriction medium is Terfenol-D or other media that can be stretched under magnetic fields；
Shape and position will guarantee the effect that can generate power to chamber under magnetic fields.
6. the optics hollow pipe cavity magnetic field sensing system that optimum sensitivity frequency location according to claim 1 is tunable,
It is characterized by: the electrostriction medium is the medium that PZT or other can stretch under voltage or electric field action；Shape
To guarantee the effect that can generate power to chamber under voltage or electric field action with position.
7. the optics hollow pipe cavity magnetic field sensing system that optimum sensitivity frequency location according to claim 1 is tunable,
It is characterized by: the relative position of the magnetostriction medium, hollow pipe cavity and electrostriction medium, bracket, as long as guaranteeing
Chamber length can change under magnetic fields, and electrostriction medium can change chamber mechanical mode frequency location.
8. the optics hollow pipe cavity magnetic field sensing system that optimum sensitivity frequency location according to claim 1 is tunable,
It is characterized by: the polarization state of the Polarization Controller will guarantee the optical figure of merit highest of optical mode.
9. the optics hollow pipe cavity magnetic field sensing system that optimum sensitivity frequency location according to claim 1 is tunable,
It is characterized by: the optical fiber will guarantee the low-loss transmission of optical signal in selected wave band.
10. the optics hollow pipe cavity magnetic field sensing system that optimum sensitivity frequency location according to claim 1 is tunable,
It is characterized by: the attenuator will guarantee the optical power for reaching detector in the receivable power bracket of detector.
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Cited By (5)
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| CN111273204A (en) * | 2020-02-25 | 2020-06-12 | 杭州电子科技大学 | Resonant cavity magnetic field sensing system for enhancing DC field sensing precision by wide temperature range AC field |
| CN111580024A (en) * | 2020-04-30 | 2020-08-25 | 杭州电子科技大学 | Optical resonance type magnetic field sensor with high sensitivity area having wide frequency band |
| CN112254752A (en) * | 2020-09-11 | 2021-01-22 | 杭州电子科技大学 | Sound wave sensor with tunable sensitivity based on resonant cavity interference structure |
| CN113655414A (en) * | 2021-08-30 | 2021-11-16 | 杭州电子科技大学 | Optical magnetic field sensing system using piezoelectric ceramic to generate resonance frequency band |
| CN113820634A (en) * | 2021-09-23 | 2021-12-21 | 杭州电子科技大学 | Double-enhanced photonic crystal cavity alternating current magnetic field sensing system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113655414A (en) * | 2021-08-30 | 2021-11-16 | 杭州电子科技大学 | Optical magnetic field sensing system using piezoelectric ceramic to generate resonance frequency band |
| CN113655414B (en) * | 2021-08-30 | 2024-05-07 | 杭州电子科技大学 | Optical magnetic field sensing system using piezoelectric ceramics to generate resonance frequency band |
| CN113820634A (en) * | 2021-09-23 | 2021-12-21 | 杭州电子科技大学 | Double-enhanced photonic crystal cavity alternating current magnetic field sensing system |
| CN113820634B (en) * | 2021-09-23 | 2024-01-02 | 杭州电子科技大学 | Double-enhanced photonic crystal cavity alternating current magnetic field sensing system |
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Effective date of registration: 20211209 Address after: 230000 B-1015, wo Yuan Garden, 81 Ganquan Road, Shushan District, Hefei, Anhui. Patentee after: HEFEI MINGLONG ELECTRONIC TECHNOLOGY Co.,Ltd. Address before: 310018 No. 2 street, Xiasha Higher Education Zone, Hangzhou, Zhejiang Patentee before: HANGZHOU DIANZI University |
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