CN101281237A - Apparatus based on magnetofluid refraction index changing and detecting magnetic variation - Google Patents
Apparatus based on magnetofluid refraction index changing and detecting magnetic variation Download PDFInfo
- Publication number
- CN101281237A CN101281237A CNA2008100374095A CN200810037409A CN101281237A CN 101281237 A CN101281237 A CN 101281237A CN A2008100374095 A CNA2008100374095 A CN A2008100374095A CN 200810037409 A CN200810037409 A CN 200810037409A CN 101281237 A CN101281237 A CN 101281237A
- Authority
- CN
- China
- Prior art keywords
- magnetic field
- light source
- refraction index
- magnetic
- magnetic fluid
- 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.)
- Granted
Links
Images
Abstract
The invention discloses an apparatus for testing magnetic variation based on the refractive index change of magnetofluid, including a first light source output device, a transmission apparatus, a magnetic field testing device and a first receiving detecting device. The magnetic field testing device includes a refractive index testing device, an electric magnet, a long cycle optical fiber grating and a magnetofluid sample. The long cycle optical fiber grating is arranged in the capillary pipe filled with magnetofluid, and then arranged between two magnetic poles of the electric magnet. A transmission apparatus is used to connect the first light source output device, the magnetic field testing device and the first receiving detecting device, the light output from the first light source output device spreads in the transmission apparatus, the light signal passing through the magnetic field testing device is then received by the first receiving detecting device. The inventive apparatus for testing magnetic variation based on the refractive index change of magnetofluid under the function of magnetic field in the normal temperature, has very high sensitivity, reaching 0.0025nm/Gs, and the operating region of the apparatus can be from 0Gs to 1500Gs.
Description
Technical field
What the present invention relates to is a kind of pick-up unit of physics field of photoelectric technology, thereby specifically is the device that detects changes of magnetic field under a kind of the action of a magnetic field based on the magnetic fluid refraction index changing.
Background technology
In optical communication, the tunable optical fiber device is very useful.Long period fiber grating can be with the covering that couples light to of fiber core, and it is to being coated on the material refractive index sensitivity of its surrounding layer, so can be used to carry out tunable filtering and band resistance.Theoretical and experimentally, people after deliberation change the optical property of long-period gratings by the refractive index that changes the long-period gratings surrounding layer.The change of long-period gratings cladding refractive index can be by placing kapillary the drop of long-period gratings periphery realize.There is several different methods to operate to drop, as: the wet advocate approach of electrochemical effect, electric capillary pressure and electricity, etc.By the circulation of wet pumping of electricity and fluid cavity, can realize the optical property of dynamic adjustments long-period gratings, make it have the characteristic of switch and wave filter.
Magnetic fluid (or is called: magnetic liquid, magnetic liquid, ferrofluid, magnetic colloid, magnetic fluid) be that it had both had the magnetic of solid matter by nano level ferromagnetism particle dispersion formed stable colloidal dispersion among certain liquid, the flowability that has liquid again is a kind of new-type functional material, is subjected to people's pay attention to day by day, it is used and has been deep into electronics, the energy, defence and military, metallurgical machinery, chemical industry environmental protection, instrument and meter, aspects such as health care, it is very remarkable to produce effects.And just have the scholar that the novel optical character (as: optical transmittance, mangneto discoloration effect, thermo-optic effect are etc. character) of magnetic fluid is studied up to the twentieth century end.In recent years, fast development along with integrated optics, photonic device, and magnetic fluid is in the discovery of the potential application of optical field, some researchers begin to pay attention to the optical property of magnetic fluid, and the photonic device based on magnetic fluid has been proposed, as photoswitch, photomodulator, magnetic field or electric-field sensor, adjustable grating and Coarse Wave Division Multiplexer, etc.
Find through literature search prior art, " the Origin and applications ofmagnetically tunable refractive index of magnetic fluid films " that S.Y.Yang etc. deliver on 2004 at " Applied PhysicsLetters " (applied physics journal), (origin that magnetic fluid thin film mangneto refractive index is adjustable and application), propose in this article to have proposed for the first time comprehensively, utilize the magnetic fluid thin film refringence to carry out the light sensing with the characteristic of magnetic field size variation, its deficiency is: because the employed experimental program modulation phenomenon that magnetic fluid is poured into fibre cladding is not very obvious, loss only is 1.13%, be difficult to satisfy high-precision magnetic-field measurement requirement, being difficult in has too many application in the actual life.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, a kind of device based on magnetic fluid refraction index changing detection changes of magnetic field is provided, make it realize regulating the purpose of long period fiber grating optical property in the method for magnetic fluid by the action of a magnetic field.The refractive index of magnetic fluid can be regulated by applying the external magnetic field.When the magnetic fluid with suitable refractive index during at the long-period gratings surrounding layer, the optical property of long-period gratings has just obtained adjusting, and then can realize the function of wave filter and photoswitch.
The present invention is achieved by the following technical solutions, the present invention includes: the first light source output unit, transmitting device, measurement of magnetic field device and first receiving detection device.Comprised the refraction index test device in the measurement of magnetic field device, electromagnet, long period fiber grating, and magnetic fluid sample.After long period fiber grating places the kapillary that magnetic fluid is housed, place in the middle of two magnetic poles of electromagnet.Use transmitting device to connect between the first light source output unit, measurement of magnetic field device and first receiving detection device, light almost lossless propagation in transmitting device of first light source output unit output is received by first receiving detection device through light signal behind the measurement of magnetic field device.Refraction index test device and magnetic fluid sample link together.More than connection between all parts all realize by optical fiber.
The described first light source output unit is the amplified spontaneous emission light source.
Described transmitting device is a standard traffic wavelength single-mode fiber.
Described first receiving detection device is a spectroanalysis instrument.
Described refraction index test device is by the secondary light source output unit, and coupling mechanism, and second receiving detection device composition are used to measure the variations in refractive index of magnetic fluid sample under magnetic field.All connect by optical fiber between these parts, the coupling mechanism in the refraction index test device is directed to fiber end face with incident light, and collects back reflected laser with optical fiber.The input end of coupling mechanism connects the secondary light source output unit, and the input end of coupling mechanism is directed to incident light on the optical fiber-magnetic fluid example interface at fiber end face place, and luminous power second receiving detection device that reflects detects to be accepted.
Described secondary light source output unit is that output power is stable, the laser instrument of communication band.
Described secondary light source pick-up unit is the light power meter of communication band.
When the present invention works, described long period fiber grating is inserted in the kapillary, and in kapillary, injected magnetic fluid, make long period fiber grating place the magnetic fluid environment.Because decay wavelength in the center of long period fiber grating is quite responsive for change of refractive around it.Therefore, when having magnetic field, the refractive index of magnetic fluid sample changes, and makes detected center decaying wave long hair give birth to drift.With this, can detect magnetic fluid variations in refractive index situation under the action of a magnetic field by detected centre wavelength drift value.In addition, by the refraction index test device, can detect add the size in magnetic field.Thereby, reach the effect in accurate detection magnetic field.
The present invention has realized the application of magnetic fluid refraction index changing in detecting magnetic field under the action of a magnetic field under normal temperature condition.In working range, its sensitivity is high, has reached 0.0025nm/Gs.This invention is applicable to the accurate temperature examination in high-precision among a small circle temperature survey or the normal temperature scope, and simple in structure, is easy to integrated.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated: present embodiment is being to implement under the prerequisite with the technical solution of the present invention, provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
As shown in Figure 1, present embodiment is a kind of device that detects changes of magnetic field based on the magnetic fluid refraction index changing: the first light source output unit 1, transmitting device 2, measurement of magnetic field device and first receiving detection device 9.
Comprised the refraction index test device in the measurement of magnetic field device, electromagnet 3, long period fiber grating 4, and magnetic fluid sample 5.After long period fiber grating 4 places the kapillary that magnetic fluid 5 is housed, place in the middle of two magnetic poles of electromagnet 3.Use transmitting device 2 to connect between the first light source output unit 1, measurement of magnetic field device and first receiving detection device 9, light almost lossless propagation in transmitting device 2 of the first light source output unit, 1 output is received by first receiving detection device 9 through light signal behind the measurement of magnetic field device.
Described refraction index test device is by secondary light source output unit 7, and coupling mechanism 6, and second receiving detection device, 8 compositions are used to measure the variations in refractive index of magnetic fluid sample under magnetic field.Fiber coupler 6 is directed to fiber end face with incident light in the refraction index test device, and collects back reflected laser with optical fiber.The input end of coupling mechanism 6 connects secondary light source output unit 7, and the input end of coupling mechanism is directed to incident light on optical fiber-magnetic fluid sample 5 interfaces at fiber end face place, and luminous power second receiving detection device 8 that reflects detects and receives.
All connect between the above-mentioned parts by optical fiber.
The described first light source output unit 1 is the amplified spontaneous emission light source.
Described transmitting device 2 is a single-mode fiber.
Described first receiving detection device 9 is a spectroanalysis instrument.
Described electromagnet apparatus 3 changes the electromagnet of magnetic field size by the size of supply current for the big I in magnetic field.
Described long period fiber grating 4 is 400 μ m for the grating cycle, and centre wavelength is the long period fiber grating of 1540.5nm in the air.
Described magnetic fluid 5 is the water-based magnetic fluid of 1.2g/ml for density.
Described coupling mechanism 6 is the coupling mechanism of 3dB.
Described secondary light source output unit 7 is power 1mW, centre wavelength 1550nm laser instrument.
Described second receiving detection device 8 is a communication band 1550nm light power meter.
During present embodiment work, described long period fiber grating 4 is inserted in the kapillary, and in kapillary, injected magnetic fluid 5, make long period fiber grating 4 place magnetic fluid 5 environment.Because decay wavelength in the center of long period fiber grating 4 is quite responsive for change of refractive around it.Therefore, when having magnetic field, the refractive index of magnetic fluid 5 samples changes, and makes detected center decaying wave long hair give birth to drift.Can detect magnetic fluid 5 variations in refractive index situation under the action of a magnetic field by detected centre wavelength drift value.In addition, by the refraction index test device, can detect add the size in magnetic field.Thereby, reach the effect in accurate detection magnetic field.It is 400 μ m that present embodiment has at first been selected the grating cycle for use, centre wavelength is the long period fiber grating 4 of 1540.5nm in the air, and placing density is the water-based magnetic fluid 5 of 1.2g/ml, in the process that applies magnetic field device change magnetic field by the outside, the center decay wavelength variations that receiving detection device 9 receives is obvious.Device center, perform region is about 25 degrees centigrade, and sensitivity has reached 0.0025nm/Gs, and experimental result and theoretical prediction coincide.Present embodiment is by applying the refractive index that magnetic field changes magnetic fluid 5, thereby changed the centre wavelength position of long period fiber grating 4, moved to 1532.2nm from 1528.4nm, and the variation range in the magnetic field of detecting thus is 0 to 1500Gs.The magnetic field that experiment draws and the pass of centre wavelength are:
λ＝[n
co-(-5.49121×10
-6×H+1.43255)]×Λ.
Present embodiment has been realized the application of magnetic fluid refraction index changing in detecting magnetic field under the action of a magnetic field under normal temperature condition.In working range, its sensitivity is high, has reached 0.0025nm/Gs.This invention is applicable to the accurate temperature examination in high-precision among a small circle temperature survey or the normal temperature scope.And simple in structure, be easy to integrated.
Claims (7)
1. device that detects changes of magnetic field based on the magnetic fluid refraction index changing, comprise: the first light source output unit, transmitting device, the measurement of magnetic field device and first receiving detection device, it is characterized in that, described measurement of magnetic field device comprises the refraction index test device, electromagnet, long period fiber grating and magnetic fluid sample, after long period fiber grating places the kapillary that magnetic fluid is housed, place in the middle of two magnetic poles of electromagnet, the first light source output unit, use transmitting device to connect between the measurement of magnetic field device and first receiving detection device, the light of first light source output unit output is propagated in transmitting device, received by first receiving detection device through light signal behind the measurement of magnetic field device, refraction index test device and magnetic fluid sample link together, more than connection between all parts all realize by optical fiber.
2. the device that detects changes of magnetic field based on the magnetic fluid refraction index changing according to claim 1, it is characterized in that, described refraction index test device is by the secondary light source output unit, the coupling mechanism and second receiving detection device are formed, all connect between these parts by optical fiber, coupling mechanism is directed to fiber end face with incident light, and collect back reflected laser with optical fiber, the input end of coupling mechanism connects the secondary light source output unit, the input end of coupling mechanism is directed to incident light on the optical fiber-magnetic fluid example interface at fiber end face place, and luminous power second receiving detection device that reflects detects to be accepted.
3. the device based on magnetic fluid refraction index changing detection changes of magnetic field according to claim 2 is characterized in that described secondary light source output unit is the communication band laser instrument.
4. the device based on magnetic fluid refraction index changing detection changes of magnetic field according to claim 2 is characterized in that described secondary light source pick-up unit is the light power meter of communication band.
5. the device based on magnetic fluid refraction index changing detection changes of magnetic field according to claim 1 is characterized in that the described first light source output unit is the amplified spontaneous emission light source.
6. the device based on magnetic fluid refraction index changing detection changes of magnetic field according to claim 1 is characterized in that described transmitting device is the single-mode fiber that communication band uses.
7. the device based on magnetic fluid refraction index changing detection changes of magnetic field according to claim 1 is characterized in that described first receiving detection device is a spectroanalysis instrument.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810037409A CN100593727C (en) | 2008-05-15 | 2008-05-15 | Apparatus based on magnetofluid refraction index changing and detecting magnetic variation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810037409A CN100593727C (en) | 2008-05-15 | 2008-05-15 | Apparatus based on magnetofluid refraction index changing and detecting magnetic variation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101281237A true CN101281237A (en) | 2008-10-08 |
| CN100593727C CN100593727C (en) | 2010-03-10 |
Family
ID=40013793
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810037409A Expired - Fee Related CN100593727C (en) | 2008-05-15 | 2008-05-15 | Apparatus based on magnetofluid refraction index changing and detecting magnetic variation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100593727C (en) |
Cited By (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101750590A (en) * | 2009-10-16 | 2010-06-23 | 电子科技大学 | Method and device for measuring environment temperature change and magnetic induction strength |
| CN102141691A (en) * | 2011-04-25 | 2011-08-03 | 东北大学 | Magnetic control tunable optical fiber comb filter |
| CN102221679A (en) * | 2011-04-25 | 2011-10-19 | 东北大学 | Magnetofluid filling photonic crystal optical fiber F-P magnetic field sensor |
| CN102411131A (en) * | 2011-07-27 | 2012-04-11 | 南开大学 | Magnetic field vector measuring instrument based on magnetic-fluid-filled titled fiber bragg grating with micro-structure |
| CN102455418A (en) * | 2010-10-18 | 2012-05-16 | 宁波大学 | Optical fiber magnetic field sensor |
| CN103163493A (en) * | 2013-01-29 | 2013-06-19 | 中国计量学院 | Reflective type magnetic field sensor based on magnetic fluid and fiber gratings |
| CN103207310A (en) * | 2013-03-14 | 2013-07-17 | 天津理工大学 | Blazed fiber bragg grating based current change detection device |
| CN103472411A (en) * | 2013-10-10 | 2013-12-25 | 中南林业科技大学 | Magnetic field sensor based on Hybrid long-period fiber grating |
| CN105022004A (en) * | 2015-07-07 | 2015-11-04 | 华南师范大学 | Waveguide magnetic field/current sensor based on surface plasmons and device |
| CN105334645A (en) * | 2014-07-21 | 2016-02-17 | 联胜（中国）科技有限公司 | 2D/3D converting device, drive method thereof and display |
| WO2016145579A1 (en) * | 2015-03-13 | 2016-09-22 | 张�浩 | Cable current sensor and cable having optical sensing unit |
| CN107621613A (en) * | 2017-01-17 | 2018-01-23 | 江西师范大学 | A kind of method that magnetic field is detected using magnetic fluid fiber waveguide |
| CN109804235A (en) * | 2016-11-30 | 2019-05-24 | 国立研究开发法人产业技术综合研究所 | Target substance detection device and target substance detection method |
| CN110054249A (en) * | 2019-05-09 | 2019-07-26 | 河海大学常州校区 | The analytical equipment of solid-liquid two phase flow in a kind of magnetic fluid photo catalysis reactor |
| CN110118730A (en) * | 2019-04-28 | 2019-08-13 | 曲阜师范大学 | Label-free bio-sensing method based on index modulation times response |
| CN110207849A (en) * | 2019-07-02 | 2019-09-06 | 浙江科技学院 | A kind of temperature sensor and measurement method based on reflective long-period fiber grating |
| CN110596618A (en) * | 2019-10-23 | 2019-12-20 | 云南师范大学 | Magnetic field measuring device and system |
| CN111736001A (en) * | 2020-06-12 | 2020-10-02 | 河南大学 | Novel optical current sensor, system and method based on magnetofluid and grating |
| CN111965754A (en) * | 2020-08-17 | 2020-11-20 | 桂林电子科技大学 | Large-range tunable filter of programmable fiber grating based on magnetofluid |
| CN112033445A (en) * | 2020-08-17 | 2020-12-04 | 桂林电子科技大学 | Large dynamic range optical fiber sensor based on programmable optical fiber grating |
| CN112130249A (en) * | 2020-08-17 | 2020-12-25 | 桂林电子科技大学 | Programmable fiber grating based on magnetofluid |
| CN112596005A (en) * | 2020-11-18 | 2021-04-02 | 苏州德睿电力科技有限公司 | Magnetic fluid-based FP magnetic field sensor and magnetic field testing system |
| CN113281685A (en) * | 2021-06-03 | 2021-08-20 | 威海长和光导科技有限公司 | Device and method for measuring magnetic field characteristics by using fiber Bragg grating |
-
2008
- 2008-05-15 CN CN200810037409A patent/CN100593727C/en not_active Expired - Fee Related
Cited By (32)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101750590A (en) * | 2009-10-16 | 2010-06-23 | 电子科技大学 | Method and device for measuring environment temperature change and magnetic induction strength |
| CN102455418B (en) * | 2010-10-18 | 2015-11-25 | 宁波大学 | Fibre optic magnetic field sensor |
| CN102455418A (en) * | 2010-10-18 | 2012-05-16 | 宁波大学 | Optical fiber magnetic field sensor |
| CN102141691A (en) * | 2011-04-25 | 2011-08-03 | 东北大学 | Magnetic control tunable optical fiber comb filter |
| CN102221679A (en) * | 2011-04-25 | 2011-10-19 | 东北大学 | Magnetofluid filling photonic crystal optical fiber F-P magnetic field sensor |
| CN102411131B (en) * | 2011-07-27 | 2014-03-19 | 南开大学 | Magnetic field vector measuring instrument based on magnetic-fluid-filled titled fiber bragg grating with micro-structure |
| CN102411131A (en) * | 2011-07-27 | 2012-04-11 | 南开大学 | Magnetic field vector measuring instrument based on magnetic-fluid-filled titled fiber bragg grating with micro-structure |
| CN103163493A (en) * | 2013-01-29 | 2013-06-19 | 中国计量学院 | Reflective type magnetic field sensor based on magnetic fluid and fiber gratings |
| CN103207310A (en) * | 2013-03-14 | 2013-07-17 | 天津理工大学 | Blazed fiber bragg grating based current change detection device |
| CN103472411A (en) * | 2013-10-10 | 2013-12-25 | 中南林业科技大学 | Magnetic field sensor based on Hybrid long-period fiber grating |
| CN105334645B (en) * | 2014-07-21 | 2018-02-16 | 联胜（中国）科技有限公司 | 2D/3D conversion equipments and its driving method, display |
| CN105334645A (en) * | 2014-07-21 | 2016-02-17 | 联胜（中国）科技有限公司 | 2D/3D converting device, drive method thereof and display |
| WO2016145579A1 (en) * | 2015-03-13 | 2016-09-22 | 张�浩 | Cable current sensor and cable having optical sensing unit |
| CN105022004A (en) * | 2015-07-07 | 2015-11-04 | 华南师范大学 | Waveguide magnetic field/current sensor based on surface plasmons and device |
| CN109804235A (en) * | 2016-11-30 | 2019-05-24 | 国立研究开发法人产业技术综合研究所 | Target substance detection device and target substance detection method |
| CN109804235B (en) * | 2016-11-30 | 2022-05-13 | 国立研究开发法人产业技术综合研究所 | Target substance detection device and target substance detection method |
| CN107621613A (en) * | 2017-01-17 | 2018-01-23 | 江西师范大学 | A kind of method that magnetic field is detected using magnetic fluid fiber waveguide |
| CN110118730B (en) * | 2019-04-28 | 2021-11-30 | 曲阜师范大学 | Label-free biosensing method based on refractive index modulation time response |
| CN110118730A (en) * | 2019-04-28 | 2019-08-13 | 曲阜师范大学 | Label-free bio-sensing method based on index modulation times response |
| CN110054249A (en) * | 2019-05-09 | 2019-07-26 | 河海大学常州校区 | The analytical equipment of solid-liquid two phase flow in a kind of magnetic fluid photo catalysis reactor |
| CN110054249B (en) * | 2019-05-09 | 2022-05-10 | 河海大学常州校区 | Analysis method for solid-liquid two-phase flow in magnetic fluid photocatalytic reactor |
| CN110207849A (en) * | 2019-07-02 | 2019-09-06 | 浙江科技学院 | A kind of temperature sensor and measurement method based on reflective long-period fiber grating |
| CN110596618B (en) * | 2019-10-23 | 2021-08-17 | 云南师范大学 | Magnetic field measuring device and system |
| CN110596618A (en) * | 2019-10-23 | 2019-12-20 | 云南师范大学 | Magnetic field measuring device and system |
| CN111736001A (en) * | 2020-06-12 | 2020-10-02 | 河南大学 | Novel optical current sensor, system and method based on magnetofluid and grating |
| CN111965754A (en) * | 2020-08-17 | 2020-11-20 | 桂林电子科技大学 | Large-range tunable filter of programmable fiber grating based on magnetofluid |
| CN112033445A (en) * | 2020-08-17 | 2020-12-04 | 桂林电子科技大学 | Large dynamic range optical fiber sensor based on programmable optical fiber grating |
| CN112130249A (en) * | 2020-08-17 | 2020-12-25 | 桂林电子科技大学 | Programmable fiber grating based on magnetofluid |
| CN112130249B (en) * | 2020-08-17 | 2022-04-19 | 桂林电子科技大学 | Programmable fiber grating based on magnetofluid |
| CN112596005A (en) * | 2020-11-18 | 2021-04-02 | 苏州德睿电力科技有限公司 | Magnetic fluid-based FP magnetic field sensor and magnetic field testing system |
| CN113281685A (en) * | 2021-06-03 | 2021-08-20 | 威海长和光导科技有限公司 | Device and method for measuring magnetic field characteristics by using fiber Bragg grating |
| CN113281685B (en) * | 2021-06-03 | 2022-02-08 | 宏安集团有限公司 | Device and method for measuring magnetic field characteristics by using fiber Bragg grating |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100593727C (en) | 2010-03-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100593727C (en) | Apparatus based on magnetofluid refraction index changing and detecting magnetic variation | |
| Wu et al. | An open-cavity Fabry-Perot interferometer with PVA coating for simultaneous measurement of relative humidity and temperature | |
| Yu et al. | In-fiber modal interferometer for simultaneous measurement of refractive index and temperature | |
| CN1963400A (en) | Fibre optic sensor for measuring temperature and refractive index of liquid contemporarily | |
| Yang et al. | A highly sensitive temperature sensor based on a liquid-sealed S-tapered fiber | |
| CN101782601A (en) | Concatenation-type fiber bragg grating self-demodulation current sensor | |
| CN108844919B (en) | Cladding reflection type inclined fiber grating refractive index sensor and manufacturing and measuring methods thereof | |
| CN105044030A (en) | Coupling refractive index meter for evanescent field among optical fibers and detecting method of coupling refractive index meter | |
| Hu et al. | A hybrid self-growing polymer microtip for ultracompact and fast fiber humidity sensing | |
| CN109186736A (en) | It is a kind of can fixing frequency displacement structure slope auxiliary Brillouin fiber optic sensing vibration measurement device and measurement method | |
| Gong et al. | Temperature-compensated refractive index sensor based on bent-fiber interference | |
| Zhao et al. | A microfiber temperature sensor based on fluorescence lifetime | |
| CN114137273B (en) | Temperature-sensitive current eliminating sensing device of FBG cascade optical fiber composite structure | |
| Bui et al. | Novel method of dual fiber Bragg gratings integrated in fiber ring laser for biochemical sensors | |
| Grobnic et al. | Bragg grating evanescent field sensor made in biconical tapered fiber with femtosecond IR radiation | |
| Zhao et al. | Refractive index sensor based on a gradually hot-pressed flatted plastic optical fiber | |
| Golnabi et al. | Design and operation of an evanescent optical fiber sensor | |
| Jiang et al. | Precise measurement of liquid-level by fiber loop ring-down technique incorporating an etched fiber | |
| CN114137446B (en) | Temperature-sensitive magnetic field eliminating sensing device of FBG cascade optical fiber composite structure | |
| Feng et al. | Intensity-modulated liquid-level and temperature sensor based on cascaded air bubble and fiber Bragg grating interferometer | |
| CN203811538U (en) | Mach-Zehnder interferometer and microcavity cascaded intensity detection type sensor | |
| CN102353651A (en) | Measuring apparatus for refractive index of active photonic crystal fiber | |
| CN104019760A (en) | Sensitivity enhancement demodulation method and device of fiber optical Bragg grating strain sensor | |
| CN209589839U (en) | Long-period fiber grating hydrogen based on Mach-Zender interferometer detects detector | |
| CN114136486A (en) | Magnetic field and temperature sensor based on FP cascade FBG structure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100310 Termination date: 20140515 |