CN105973279A - Single-end reflective long-period fiber grating sensor and manufacture process thereof - Google Patents
Single-end reflective long-period fiber grating sensor and manufacture process thereof Download PDFInfo
- Publication number
- CN105973279A CN105973279A CN201610410962.3A CN201610410962A CN105973279A CN 105973279 A CN105973279 A CN 105973279A CN 201610410962 A CN201610410962 A CN 201610410962A CN 105973279 A CN105973279 A CN 105973279A
- Authority
- CN
- China
- Prior art keywords
- section
- tail end
- metal film
- fiber grating
- end section
- 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
- 239000000835 fiber Substances 0.000 title claims abstract description 240
- 238000000034 method Methods 0.000 title abstract description 5
- 230000008569 process Effects 0.000 title abstract description 4
- 238000004519 manufacturing process Methods 0.000 title abstract 3
- 239000002184 metal Substances 0.000 claims abstract description 130
- 229910052751 metal Inorganic materials 0.000 claims abstract description 130
- 238000005516 engineering process Methods 0.000 claims abstract description 15
- 239000000523 sample Substances 0.000 claims abstract description 15
- 230000000694 effects Effects 0.000 claims description 40
- 238000012545 processing Methods 0.000 claims description 12
- 238000003466 welding Methods 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 8
- 238000007747 plating Methods 0.000 claims description 5
- 230000035945 sensitivity Effects 0.000 abstract description 14
- 239000007788 liquid Substances 0.000 abstract description 8
- 230000008901 benefit Effects 0.000 abstract description 4
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 abstract 2
- 229910052763 palladium Inorganic materials 0.000 abstract 1
- 239000013307 optical fiber Substances 0.000 description 28
- 239000010410 layer Substances 0.000 description 24
- 238000005253 cladding Methods 0.000 description 17
- 238000000576 coating method Methods 0.000 description 13
- 239000011248 coating agent Substances 0.000 description 12
- 230000008859 change Effects 0.000 description 10
- 230000008878 coupling Effects 0.000 description 8
- 238000010168 coupling process Methods 0.000 description 8
- 238000005859 coupling reaction Methods 0.000 description 8
- 238000010276 construction Methods 0.000 description 5
- 239000012528 membrane Substances 0.000 description 5
- 238000001228 spectrum Methods 0.000 description 5
- 239000006185 dispersion Substances 0.000 description 4
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 4
- 229910052737 gold Inorganic materials 0.000 description 4
- 239000010931 gold Substances 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 4
- 238000002835 absorbance Methods 0.000 description 3
- 238000004026 adhesive bonding Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 230000004044 response Effects 0.000 description 3
- 229910052709 silver Inorganic materials 0.000 description 3
- 239000004332 silver Substances 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000009738 saturating Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000007888 film coating Substances 0.000 description 1
- 238000009501 film coating Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000004899 motility Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000000411 transmission spectrum Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/268—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light using optical fibres
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/36—Forming the light into pulses
- G01D5/38—Forming the light into pulses by diffraction gratings
Abstract
The invention discloses a single-end reflective long-period fiber grating sensor and a manufacture process thereof, wherein the single-end reflective long-period fiber grating sensor and the manufacture process thereof belong to the field of fiber grating sensing technology. The single-end reflective long-period fiber grating sensor comprises a long-period fiber grating segment, a fiber segment and a tail segment. The long-period fiber grating segment, the fiber segment and the tail segment are successively arranged from left to right. The surface of the long-period fiber grating segment is provided with a fiber grating segment metal film. The surface of the tail segment is provided with a tail segment metal film. The end surface of the tail segment is provided with a tail segment end surface metal film. In the fiber grating segment, a fiber grating segment core and the fiber grating segment metal film are successively arranged from inside to outside. The fiber grating segment metal film, the tail segment metal film and the tail segment end surface metal film are palladium films. The single-end reflective long-period fiber grating sensor has a probe type structure and has advantages of simple structure, small size and high sensitivity. Furthermore the single-end reflective long-period fiber grating sensor is sensitive to external physical quantities such as temperature, refractivity and liquid level. Furthermore the single-end reflective long-period fiber grating sensor can be widely used in the fields of biology, chemistry, physics, civil engineering, medical treatment, etc.
Description
Technical field
The invention belongs to fiber grating sensing technology field, relate to a kind of reflective long-period fiber grating sensor, be specifically related to
A kind of single-ended reflective long-period fiber grating sensor and processing technology thereof.
Background technology
LPFG (LPFG) cycle is tens to hundreds of micron, is between fibre core basic mode and the cladding mode of symport
Coupling, its function is to be coupled in covering lose by the light wave of the specific wavelength propagated in optical fiber, and does not produce reflection.Real
Verify that the transmission characteristic of bright LPFG can change because of the change of the extraneous factor such as stress, temperature, and relatively optical fiber cloth
The reaction of glug grating (FBG) is more sensitive, is a kind of preferably sensing element.Its application widely, passes at optical fiber
Sense and optical-fibre communications field have a good application prospect.But, it is the most just the transmissison characteristic due to LPFG so that it is as sensing
During element, it is impossible to as reflective probe structure, and demodulated equipment spectrogrph is expensive, bulky, causing should in reality
There are many limitations used time.
" Acta Optica " has delivered " plating LPFG strength of fluid based on double-humped resonance effect sensing for 2011
Device ", author: Gu Zhengxian, Zhangjiang great waves, proposition based on double-humped resonance effect LPFG, remain transmission-type optical fiber
Grating sensor, is not easy to realize the sensing of sonde configuration；" photoelectric project " 07 phase in 2009 has delivered " metal coating SPR
Single end face LPFG index sensor ", author: Zhao Minfu, Zhang Guiju, Ma Difeng；The reflective long period optical fiber proposed
Grating, it is disadvantageous in that, 1) on grating, the thin metal film of various different-thickness is plated to excite table described in the document
Surface plasma ripple, measures the refractive index of liquid, and studies its reflection resonance with this metal-coated membrane fiber-optic grating sensor
The characteristic of spectrum；In actual application, affect the many factors of the sensitivity characteristic of reflective long-period fiber grating sensor, this article
Offer and only carried out research work from the angle of SPR effect, although provide reference for measuring refractive index, but be intended to reach accurate
Measurement performance also needs to consider a lot of other factor；2) document uses wideband light source and spectrogrph to measure, wideband light source and
Spectrogrph is expensive, bulky, relatively costly in actual promoting the use of, and uses inconvenience, and takies more human resources；
3) sensor construction in the document is monolithic construction, and due in use, end is easily touched by the external world and damaged,
And monolithic construction cannot change sensor probe flexibly, it is the most convenient to use；If tip damage simultaneously, whole sensor damages
Bad, cost increases；On the other hand the grating sensor of monolithic construction, makes owing to cannot coordinate with the optical fiber of other special natures
With, such as, non-zero dispersion fiber, the optical fiber of micro-bend insensitive characteristic, ultra-low loss single-mode fiber etc., can not meet various not
Same demand, therefore range of application selectivity is little, thus causes sensing arrangement popularization and application limited.
Summary of the invention
1. invention to solve the technical problem that
Monitoring, for existing transmission-type LPFG, the problem that expensive equipment inconvenient, required is huge, the present invention proposes one
Single-ended reflective long-period fiber grating sensor and processing technology thereof.It can be monitored in real time, and to temperature, refractive index, liquid
The external physical quantity such as position are sensitive, can be widely applied to the fields such as biology, chemistry, physics, building, medical treatment.
2. technical scheme
For solving the problems referred to above, the technical scheme that the present invention provides is:
A kind of based on single-ended reflective long-period fiber grating sensor, including LPFG section, fiber segment and tail end section,
From left to right being followed successively by LPFG section, fiber segment and tail end section, the surface of LPFG section is provided with one layer
Fiber grating section metal film, the surface of tail end section is provided with one layer of tail end section metal film, and the end face of tail end section is provided with one layer of tail end
Section end plane metal film.
Due to be coupled to fibre cladding high-order mode light energy arrive fiber end face reflection after, by LPG be coupled back into sandwich layer pass
Broadcasting, interfere with by the forward direction light wave of fibre core, and this self-interference effect environment to external world is the most particularly sensitive, the present invention exists
Utilizing interference effect on LPFG, be relatively difficult to expect, if not making single-ended reflective structure, also cannot
Self-interference effect occur, both considers, and needs the coating film thickness simultaneously considering to produce SPR effect and is produced from interference effect
To the distance i.e. chamber length of end face, therefore there is difficulty in the grating answered.SPR effect and interference effect pair are considered
The sensitivity characteristic of external environment is after combining both, in sensor of the invention principle, simple with prior art
The sensor using the LPFG of SPR effect is compared, and improves the sensitivity characteristic of sensor.
Preferably, described fiber grating section metal film, tail end section metal film and tail end section end plane metal film are porpezite film.Also
Other metal films (such as gold, silver) can be selected.Porpezite film has high reflectance, the most oxidizable, easily with optical fiber adhesive bonding.
Preferably, fiber grating section is followed successively by fiber grating section fibre core and fiber grating section metal film from the inside to the outside.
Preferably, tail end section is followed successively by tail end section fibre core and tail end section metal film from the inside to the outside, and the end face of tail end section has tail end Duan Duan
Face metal film.
Preferably, fiber grating section fibre core and fiber segment fibre core are overall fibre core, selection single-mode fiber；Tail end section fibre core is also
Single-mode fiber, because multimode fibre does not have same sensing characteristics, good for ensureing the sensing characteristics of sensor, therefore use
Single-mode fiber.
Fiber grating section fibre core and fiber segment fibre core are that an entirety is cut off, and tail end section fibre core is in other one section of optical fiber connection
, if tail end section fibre core selects micro-bend insensitive optical fiber, then can be to micro-bend insensitive such that it is able to avoid micro-bend to reflection
The impact of spectrum；If tail end section fibre core selects the optical fiber of other special natures, such as bend insensitive fiber, ultra-low loss single-mode optics
Fine etc., then can play special effect, so be conducive to the motility in processing technology, and disclosure satisfy that in practical application
Different demands.
Preferably, the thickness of fiber grating section metal film is 50-100nm, tail end section metal film, the thickness of tail end section end plane metal film
Degree is about 700-1000nm.The thickness of fiber grating section metal film selects thin, is to excite SPR effect, tail end Duan Duan
The thickness of face metal film is thick, is to there be good reflecting effect.
Preferably, a length of 4-6cm of described fiber grating section, a length of 1-2cm of fiber segment, a length of 1-6cm of tail end section.
The length of fiber grating section is fixing, and the length of fiber segment is to facilitate welding to make, and the length selection of tail end section is
Be conducive to reflection, and produce preferable interference effect, and ensure the most latter made probe size, if length is oversize, it will do not have
There is self-interference effect.
A kind of processing technology based on single-ended reflective long-period fiber grating sensor, the steps include:
A, one end of LPFG is cut flat with, form LPFG section and fiber segment；
B, LPFG intrasegmental part are fiber grating section fibre cores, plate one layer of optical fiber light at LPFG section surface
Grid section metal film, LPFG surface forms plasma resonance effect；The thickness of fiber grating section metal film is
50-100nm；
C, choosing plain cylindrical form single-mode fiber, the end face at this single-mode fiber plates one layer of tail end section end plane metal film, to be formed
High reflectance minute surface, at one layer of tail end section metal film of plated surface of this single-mode fiber, this single-mode fiber is tail end section；Tail end Duan Jin
The thickness belonging to film and tail end section end plane metal film is 700-1000nm；
D, by fiber segment and tail end section welding, constitute a kind of single-ended reflective plated film LPFG sensor probe.
Preferably, a length of 4-6cm of LPFG section, a length of 1-2cm of fiber segment, tail end section core length
1-6cm。
Preferably, the Coating Materials of fiber grating section metal film, tail end section metal film and tail end section end plane metal film is porpezite.
Single-ended reflection self-interference effect is applied in metal-coated membrane LPG structure by sensor of the invention, comprehensive utilization SPR effect
Answer and the advantage of the sensitive response of self-interference effect ambient refractive index to external world, build and there is highly sensitive single-ended reflective plated film knot
Structure long-period gratings (Single reflection Coating LPG is called for short SCLPG).
The present invention has sonde-type structure based on single-ended reflective plated film long-period fiber grating sensor, saturating compared to common
Penetrate formula LPFG compact conformation, and there is higher sensing sensitivity, it is possible to monitor in real time, and to temperature, refraction
The external physical quantity such as rate, liquid level is sensitive, can be widely applied to the fields such as biology, chemistry, physics, building, medical treatment.
3. beneficial effect
(1) the fiber grating section metal film of the present invention, tail end section metal film and tail end section end plane metal film are porpezite film.Also may be used
To select other metal films (such as gold, silver), porpezite film has high reflectance, the most oxidizable, easily with optical fiber adhesive bonding, and plating
Membrane process is simple, also is able to improve the reflection characteristic of sensor simultaneously, and then improves the sensitivity of sensor；
(2) the LPFG intrasegmental part of the present invention is fiber grating section fibre core, plates one at LPFG section surface
Layer fiber grating section metal film, LPFG surface forms plasma resonance effect, and plasma resonance effect is to table
Face environment has the highest sensitivity, by this sensitivity, to the external environment condition of optical fiber position (such as temperature, humidity,
Liquid level etc.) it is monitored, to be applied to different fields, solve various problem；
(3) present invention is by fiber segment fibre core and tail end section fibre core welding, and choose due to tail end section is healthy and free from worry bend-insensitive single mode
Optical fiber, after being fabricated to the sensor probe of sensor of the present invention, it is to avoid the micro-bend impact on spectrum shape；
(4) present invention uses the sensing of reflective sonde configuration so that sensor of the invention monitoring is convenient, it is only necessary to a light
Fine grating demodulation instrument, this instrument volume is little, low cost；
(5) present invention's has sonde-type structure, compared to commonly based on single-ended reflective plated film long-period fiber grating sensor
Transmission-type LPFG compact conformation, and there is higher sensing sensitivity, it is possible to monitor in real time, and to temperature,
The external physical quantity such as refractive index, liquid level is sensitive, can be widely applied to the fields such as biology, chemistry, physics, building, medical treatment；
(6) single-ended reflection self-interference effect is applied in metal-coated membrane LPG structure by sensor of the invention, comprehensively utilizes SPR
Effect and the advantage of the sensitive response of self-interference effect ambient refractive index to external world, build and have highly sensitive single-ended reflective plated film
Structure long-period gratings.
Accompanying drawing explanation
Fig. 1 is sensor of the invention structural representation；
Fig. 2 is the experimental system figure based on single-ended reflection plated film long-period fiber grating sensor of the application present invention.
Label title in figure:
1, LPFG section (LPG)；2, fiber segment；3, tail end section；4, fiber grating section fibre core；5, optical fiber
Section fibre core；6, tail end section fibre core；7, fiber grating section metal film；8, tail end section metal film；9, tail end section end plane metal film；
10, fiber Bragg grating (FBG) demodulator.
Detailed description of the invention
Below in conjunction with accompanying drawing, the detailed description of the invention of the present invention is described in further detail.
Embodiment 1
In conjunction with Fig. 1-2, a kind of based on single-ended reflective long-period fiber grating sensor, including LPFG section 1, light
Fine section 2 and tail end section 3, be from left to right followed successively by LPFG section 1, fiber segment 2 and tail end section 3, fiber grating section
The a length of 4-6cm of 1, a length of 1-2cm of fiber segment 2, a length of 1-6cm of tail end section 3.
Fiber grating section 1 is followed successively by fiber grating section fibre core 4 and fiber grating section metal film 7, long period optical fiber light from the inside to the outside
The surface of grid section 1 is provided with one layer of fiber grating section metal film 7, and the surface of tail end section 3 is provided with one layer of tail end section metal film 8,
The end face of tail end section 3 is provided with one layer of tail end section end plane metal film 9, and tail end section 3 is followed successively by tail end section fibre core 6 He from the inside to the outside
Tail end section metal film 8, the fibre core of fiber segment 2 is fiber segment fibre core 5, and fiber grating section fibre core 4 and fiber segment fibre core 5 are overall
Fibre core, can be single-mode fiber；Tail end section fibre core 6 can be single-mode fiber.
The end face of tail end section 3 has tail end section end plane metal film 9.Described fiber grating section metal film 7, tail end section metal film 8 and
Tail end section end plane metal film 9 is porpezite film.Other metal films (such as gold, silver) can also be selected.Porpezite film has high reflectance,
The most oxidizable, easily with optical fiber adhesive bonding, coating process is simple, also is able to improve the reflection characteristic of sensor simultaneously.Optical fiber
The thickness of grating section metal film 7 is 50-100nm, and tail end section metal film 8, the thickness of tail end section end plane metal film 9 are
700-1000nm。
A kind of processing technology based on single-ended reflective long-period fiber grating sensor, the steps include:
A, one end of LPFG is cut flat with, form LPFG section 1 and fiber segment 2；
B, LPFG section 1 are internal is fiber grating section fibre core 4, at one layer of light of LPFG section 1 plated surface
Fine grating section metal film 7, LPFG surface forms plasma resonance effect；The thickness of fiber grating section metal film 7
Degree is 50-100nm；
C, choosing plain cylindrical form single-mode fiber, the end face at this single-mode fiber plates one layer of tail end section end plane metal film 9, to be formed
High reflectance minute surface, at one layer of tail end section metal film 8 of plated surface of this single-mode fiber, this single-mode fiber is tail end section 3；Tail end section
The thickness of metal film 8 and tail end section end plane metal film 9 is 700-1000nm；Fiber grating section metal film 7, tail end section metal film
8 and the Coating Materials of tail end section end plane metal film 9 be porpezite；
D, by fiber segment 2 and tail end section 3 welding, constitute a kind of single-ended reflective plated film LPFG sensor probe.
The a length of 4-6cm of LPFG section 1, a length of 1-2cm of fiber segment 2, tail end section 3 core length 1-6cm.
Single-ended reflection self-interference effect is applied in metal-coated membrane LPG structure by sensor of the invention, comprehensively utilizes SPR effect
And the advantage of the sensitive response of self-interference effect ambient refractive index to external world, build and there is highly sensitive single-ended reflective coating structure
Long-period gratings (Single reflection Coating LPG is called for short SCLPG).
Embodiment 2
The present embodiment is similar to Example 1, wherein, a length of 4cm of the fiber grating section 1 of sensor, the length of fiber segment 2
Degree is 1cm, a length of 1cm of tail end section 3.The thickness of fiber grating section metal film 7 is 50nm, tail end section metal film 8,
The thickness of tail end section end plane metal film 9 is 700nm.
A kind of processing technology based on single-ended reflective long-period fiber grating sensor, the steps include:
A, one end of LPFG is cut flat with, form LPFG section 1 and fiber segment 2；
B, LPFG section 1 are internal is fiber grating section fibre core 4, at one layer of light of LPFG section 1 plated surface
Fine grating section metal film 7, LPFG surface forms plasma resonance effect；The thickness of fiber grating section metal film 7
Degree is 50nm；
C, choosing plain cylindrical form single-mode fiber, the end face at this single-mode fiber plates one layer of tail end section end plane metal film 9, to be formed
High reflectance minute surface, at one layer of tail end section metal film 8 of plated surface of this single-mode fiber, this single-mode fiber is tail end section 3；Tail end section
The thickness of metal film 8 and tail end section end plane metal film 9 is 700nm；Fiber grating section metal film 7, tail end section metal film 8 and
The Coating Materials of tail end section end plane metal film 9 is porpezite；
D, by fiber segment 2 and tail end section 3 welding, constitute a kind of single-ended reflective plated film LPFG sensor probe.
The a length of 4cm of LPFG section 1, a length of 1cm of fiber segment 2, tail end section 3 core length 1cm.
The present invention has sonde-type structure based on single-ended reflective plated film long-period fiber grating sensor, saturating compared to common
Penetrate formula LPFG compact conformation, and there is higher sensing sensitivity, it is possible to monitor in real time, and to temperature, refraction
The external physical quantity such as rate, liquid level is sensitive, can be widely applied to the fields such as biology, chemistry, physics, building, medical treatment.
Embodiment 3
The present embodiment is similar to Example 1, wherein, a length of 6cm of the fiber grating section 1 of sensor, the length of fiber segment 2
Degree is 2cm, a length of 6cm of tail end section 3.The thickness of fiber grating section metal film 7 is 100nm, tail end section metal film 8,
The thickness of tail end section end plane metal film 9 is 1000nm.
A kind of processing technology based on single-ended reflective long-period fiber grating sensor, the steps include:
A, one end of LPFG is cut flat with, form LPFG section 1 and fiber segment 2；
B, LPFG section 1 are internal is fiber grating section fibre core 4, at one layer of light of LPFG section 1 plated surface
Fine grating section metal film 7, LPFG surface forms plasma resonance effect；The thickness of fiber grating section metal film 7
Degree is 100nm；
C, choosing plain cylindrical form single-mode fiber, the end face at this single-mode fiber plates one layer of tail end section end plane metal film 9, to be formed
High reflectance minute surface, at one layer of tail end section metal film 8 of plated surface of this single-mode fiber, this single-mode fiber is tail end section 3；Tail end section
The thickness of metal film 8 and tail end section end plane metal film 9 is 1000nm；Fiber grating section metal film 7, tail end section metal film 8 and
The Coating Materials of tail end section end plane metal film 9 is porpezite；
D, by fiber segment 2 and tail end section 3 welding, constitute a kind of single-ended reflective plated film LPFG sensor probe.
The a length of 6cm of LPFG section 1, a length of 2cm of fiber segment 2, tail end section 3 core length 6cm.
Embodiment 4
The present embodiment is similar to Example 1, is wherein a difference in that, a length of 5cm of the fiber grating section 1 of sensor, light
The a length of 1.5cm, a length of 4cm of tail end section 3 of fine section 2.The thickness of fiber grating section metal film 7 is 80nm, tail end
Section metal film 8, the thickness of tail end section end plane metal film 9 are 800nm.
A kind of processing technology based on single-ended reflective long-period fiber grating sensor, the steps include:
A, one end of LPFG uses cutter cut flat with, form LPFG section 1 and fiber segment 2；
B, LPFG section 1 are internal is fiber grating section fibre core 4, at one layer of light of LPFG section 1 plated surface
Fine grating section metal film 7, LPFG surface forms plasma resonance effect；The thickness of fiber grating section metal film 7
Degree is 80nm；
C, choosing plain cylindrical form single-mode fiber, the end face at this single-mode fiber plates one layer of tail end section end plane metal film 9, to be formed
High reflectance minute surface, at one layer of tail end section metal film 8 of plated surface of this single-mode fiber, this single-mode fiber is tail end section 3；Tail end section
The thickness of metal film 8 and tail end section end plane metal film 9 is 800nm；Fiber grating section metal film 7, tail end section metal film 8 and
The Coating Materials of tail end section end plane metal film 9 is porpezite；
D, by fiber segment 2 and tail end section 3 welding, constitute a kind of single-ended reflective plated film LPFG sensor probe.
The a length of 5cm of LPFG section 1, a length of 1.5cm of fiber segment 2, tail end section 3 core length 4cm.
Embodiment 5
The present embodiment is applicable to embodiment 1-4, and one end of LPFG uses cutter to cut flat with, and forms long period optical fiber light
Grid section 1 and fiber segment 2, plate fiber grating section metal film 7 on LPFG 1, now formed on fiber grating surface
Plasma resonance effect, surface plasma body resonant vibration (surface plasma resonance, SPR) effect is to surface environment
There is the highest sensitivity, when LPG covering plates one layer of sufficiently thin metal film, between metal film and medium interface, have SPR
Effect.Meanwhile, plate highly reflecting films in LPG terminal, transmission-type LPG is constituted reflective probe structure, is then coupled to optical fiber
The light energy of covering high-order mode arrives fiber end face, is coupled back into sandwich layer by LPG and propagates, before by fibre core after reflection
Interfering to light wave, this self-interference effect is particularly sensitive to external environment condition, by this sensitivity, to optical fiber position
External environment condition (such as temperature, humidity, liquid level etc.) be monitored, to be applied to different fields, solve various asking
Topic.
Choose plain cylindrical form single-mode fiber (can be other kind single-mode fibers), the end face plating of tail end section fibre core 6
The tail end section end plane metal film 9 that 700nm-1000nm is thick, to form high reflectance minute surface.Again by fiber segment fibre core 5 and tail end section
Fibre core 6 welding, choose due to tail end section 3 is healthy and free from worry bend-insensitive single-mode optical fiber, is fabricated to sensor of the present invention
Sensor probe after, it is to avoid the micro-bend impact on spectrum shape.The present invention uses the sensing of reflective sonde configuration so that the present invention
Sensor monitoring convenient, it is only necessary to a fiber Bragg grating (FBG) demodulator 11, this instrument volume is little, low cost.
Fiber grating section metal film 7, tail end section metal film 8 and tail end section end plane metal film 9 can use ion sputtering film coating method
Making, Coating Materials is porpezite, and the reason selecting porpezite is owing to it has high reflectance, the most oxidizable, easily with attached with optical fiber
Bonding, the effect of metal film 7 is when there being light source, can form surface plasma bulk effect, tail end section end face gold as substrate
Genus film 9 is as full wave end mirror, and the end face reflection rate after plated film is up to 75%, and thickness is 700nm-1000nm.
LPFG section 1 arrives the distance between tail end section end plane metal film 9, defines self-interference effect, thus constitutes Gao Ling
The single-ended reflective plated film long-period fiber grating sensor of sensitivity.
Fig. 2 is the experimental system figure of application sensor of the invention, the light warp sent by fiber Bragg grating (FBG) demodulator 10 channel interior
After crossing sensor of the invention, it is reflected back toward fiber Bragg grating (FBG) demodulator 10 and shows spectrum.The present invention need not use wideband light source
And spectrogrph measures, thus provide cost savings, it is simple to promote the use of in practice, and do not take more manpower.
Embodiment 6
The present embodiment is similar to Example 1, is wherein a difference in that, tail end section 3 uses micro-bend insensitive optical fiber, it is thus possible to
Enough avoid the impact of vibration.The most this fiber segment 2 of the present invention and the structure of tail end section 3 split so that tail end
Section 3 can select the optical fiber with some special natures, and in use, end is easily touched by the external world and damaged, and
Segmentation structure is easily changed end construction, thus meets different demand.
Embodiment 7
The present embodiment is similar to Example 6, is wherein a difference in that, different according to demand, tail end section 3 uses non-zero dispersion light
Fibre, so that dispersion is zero, the wavelength of zero dispersion point is 1.54-1.565nm, LPFG section 1, fiber segment 2
Distributed structure this with tail end section 3 so that the optional scope of wavelength of LPFG section 1 is big.
Embodiment 7
The present embodiment is similar to Example 6, is wherein a difference in that, different according to demand, tail end section 3 uses ultra-low loss list
Mode fiber.
Embodiment 8
The present embodiment is that the principle to embodiment 1-7 is discussed, single-ended reflection LPFG probe (Single Coating
Long-period-fiber grating, SCLPG) sensing principle:
The Mode Coupling of LPFG belongs to coupling between fibre core basic mode LP01 and the single order cladding mode LP0m of symport.By coupling
Matched moulds theory understands, and the phase-matching condition of LPFG can be represented by formula:
It is respectively fiber core and the effective refractive index of the m time cladding mode.The effective refractive index of fibre core basic modeBy
Fiber core refractive index n1With cladding index n2Determine, and the effective refractive index of cladding mode and n1, n2While relevant, go back and environment
Refractive index nsurRelevant, when ambient refractive index change will cause the change of cladding mode effective refractive index, and then cause resonance wavelengthL's
Drift.Therefore, the change of the resonance wavelength of LPFG ambient refractive index to external world is particularly sensitive, the LPFG fixing to a cycle,
Have:
Meanwhile, along with ambient refractive index nsurChange, LPFG is in resonance wavelengthLAbsorbance T at place changes the most accordingly:
T=sin2(kL)
Wherein:For the coefficient of coup between fibre core basic mode and cladding mode, L is grating length.
I is the integration that intersects of basic mode and cladding mode in core region.Wherein: Ecore, EcladIt is respectively fibre core basic mode and cladding mode
Electric field magnitude, DncoFor the modulation rate of fibre core, a is fiber core radius.
As can be seen here, when LPFG is changed by extraneous refractive index, cladding mode effective refractive index will be causedChange,
Thus make resonance wavelengthLDrift about, meanwhile,Change also change integration I value, thus cause the change of coefficient of coup k
Change, and then make resonance wavelengthLCorresponding absorbance changes, i.e. the whole transmission spectrum of LPFG changes.
The screen periods of LPFG is typically more than 100 μm, and it is based on meeting phase-matching condition in optical fiber in the same direction
Resonance coupling between pattern, is will to couple, by light wave between the guided mode of fl transmission with other forward direction guided modes or forward radiation mould
In the losing optically coupling to going in covering, therefore without retroreflection of certain frequency band.And it is high when plating reflectance at grating end face
After metal film, the transmission light through LPFG will form single-ended reflection LPFG probe at end face reflection originally.
And experiments verify that, it has temperature, refractive index sensing characteristic equally.
When ambient refractive index is less than cladding mode refractive index about 1.458, resonance wavelength is along with the increase of ambient refractive index is to shortwave
Direction offsets, and when near cladding index, side-play amount significantly becomes big, and now the sensitivity of LPFG refractive index increases；When
When ambient refractive index increases to equal to cladding index, now it is believed that cladding radius is infinitely great, coupling peak all disappears；And work as
When ambient refractive index continues to increase to above cladding index, resonance wavelength occurs at initial position again, and along with refractive index
Continuing to increase, resonance peak position is almost unchanged, but now stiffness of coupling reduces, and absorbance increases, resonance peak depth shallower.Logical
Crossing experiment to understand, when steel bar corrosion is more serious, rust water refractive index is 1.3536, still less than the refractive index 1.458 of cladding mode, i.e.
Being still within can monitoring range.
Schematically being described the present invention and embodiment thereof above, this description does not has restricted, shown in accompanying drawing yet
Simply one of embodiments of the present invention, actual structure is not limited thereto.So, if those of ordinary skill in the art
Enlightened by it, in the case of without departing from the invention objective, design the knot similar to this technical scheme without creative
Structure mode and embodiment, all should belong to protection scope of the present invention.
Claims (10)
1. based on a single-ended reflective long-period fiber grating sensor, including LPFG section (1), fiber segment
And tail end section (3) (2), it is characterised in that be from left to right followed successively by LPFG section (1), fiber segment (2) and
Tail end section (3), the surface of LPFG section (1) is provided with one layer of fiber grating section metal film (7), tail end section (3)
Surface be provided with one layer of tail end section metal film (8), the end face of tail end section (3) is provided with one layer of tail end section end plane metal film (9).
One the most according to claim 1 is based on single-ended reflective long-period fiber grating sensor, it is characterised in that institute
Fiber grating section metal film (7), tail end section metal film (8) and tail end section end plane metal film (9) stated are porpezite film.
One the most according to claim 1 is based on single-ended reflective long-period fiber grating sensor, it is characterised in that light
Fine grating section (1) is followed successively by fiber grating section fibre core (4) and fiber grating section metal film (7) from the inside to the outside.
One the most according to claim 3 is based on single-ended reflective long-period fiber grating sensor, it is characterised in that tail
End section (3) is followed successively by tail end section fibre core (6) and tail end section metal film (8) from the inside to the outside, and the end face of tail end section (3) has tail end
Section end plane metal film (9).
One the most according to claim 3 is based on single-ended reflective long-period fiber grating sensor, it is characterised in that light
Fine grating section fibre core (4) and fiber segment fibre core (5) are overall fibre core, selection single-mode fiber；Tail end section fibre core (6) is also
Single-mode fiber.
One the most according to claim 3 is based on single-ended reflective long-period fiber grating sensor, it is characterised in that light
The thickness of fine grating section metal film (7) is 50-100nm, tail end section metal film (8), the thickness of tail end section end plane metal film (9)
Degree is 700-1000nm.
One the most according to claim 3 is based on single-ended reflective long-period fiber grating sensor, it is characterised in that institute
State a length of 4-6cm of fiber grating section (1), a length of 1-2cm of fiber segment (2), a length of 1-6cm of tail end section (3).
8. a processing technology based on single-ended reflective long-period fiber grating sensor, it is characterised in that:
A, one end of LPFG is cut flat with, form LPFG section (1) and fiber segment (2)；
B, LPFG section (1) are internal is fiber grating section fibre core (4), at LPFG section (1) table
One layer of fiber grating section metal film (7) of face plating, LPFG surface forms plasma resonance effect；
C, choosing plain cylindrical form single-mode fiber, the end face at this single-mode fiber plates one layer of tail end section end plane metal film (9), with
Forming high reflectance minute surface, one layer of tail end section metal film (8) of plated surface of this single-mode fiber, this single-mode fiber is tail end section (3)；
D, by fiber segment (2) and tail end section (3) welding, constitute a kind of single-ended reflective plated film LPFG sensing
Probe.
A kind of processing technology based on single-ended reflective long-period fiber grating sensor the most according to claim 8, it is special
Levy and be, a length of 4-6cm of LPFG section (1), a length of 1-2cm of fiber segment (2), tail end section (3)
Core length 1-6cm.
A kind of processing technology based on single-ended reflective long-period fiber grating sensor the most according to claim 8, its
It is characterised by, fiber grating section metal film (7), tail end section metal film (8) and the plated film material of tail end section end plane metal film (9)
Material is porpezite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610410962.3A CN105973279B (en) | 2016-06-03 | 2016-06-03 | The single-ended reflective long-period fiber grating sensor of one kind and its manufacture craft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610410962.3A CN105973279B (en) | 2016-06-03 | 2016-06-03 | The single-ended reflective long-period fiber grating sensor of one kind and its manufacture craft |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105973279A true CN105973279A (en) | 2016-09-28 |
| CN105973279B CN105973279B (en) | 2019-03-19 |
Family
ID=57010490
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610410962.3A Active CN105973279B (en) | 2016-06-03 | 2016-06-03 | The single-ended reflective long-period fiber grating sensor of one kind and its manufacture craft |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105973279B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106932026A (en) * | 2017-04-24 | 2017-07-07 | 华中科技大学 | A kind of quasi-distributed seawater thermohaline sensor, measurement apparatus and its method |
| CN109580984A (en) * | 2019-01-14 | 2019-04-05 | 浙江工业大学 | Air velocity transducer based on long-period fiber grating |
| 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 |
| CN111678539A (en) * | 2019-03-11 | 2020-09-18 | 新加坡国立大学 | Fiber grating sensor for surgical instrument |
| CN114777836A (en) * | 2022-03-10 | 2022-07-22 | 吉林大学 | Optical fiber high-temperature stress sensor based on yttrium aluminum garnet crystal derived optical fiber and preparation method thereof |
Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6275628B1 (en) * | 1998-12-10 | 2001-08-14 | Luna Innovations, Inc. | Single-ended long period grating optical device |
| CN101017139A (en) * | 2006-12-26 | 2007-08-15 | 重庆工学院 | Minisize multiplexing interfering biomolecule effect sensing method and probe |
| CN101042328A (en) * | 2007-04-26 | 2007-09-26 | 南京航空航天大学 | Monitoring methods for reinforcement corrosion of long period optical fiber grating and sensor thereof |
| US20090097807A1 (en) * | 2007-10-16 | 2009-04-16 | Xijia Gu | Shaping a laser beam with a fiber-based device |
| CN101545851A (en) * | 2009-04-27 | 2009-09-30 | 浙江大学 | Long period fiber grating-based reflection-type optical fiber biochemical sensor and manufacturing method thereof |
| CN201392311Y (en) * | 2009-04-27 | 2010-01-27 | 浙江大学 | Reflection-type optical fiber biochemistry sensor based on long period optical fiber grating |
| CN102183487A (en) * | 2011-02-11 | 2011-09-14 | 上海理工大学 | Manufacturing method of metal film plated double-humped resonance liquid sensor based on SPR (Surface Plasmon Resonance) |
| CN102829893A (en) * | 2012-09-20 | 2012-12-19 | 中国人民解放军国防科学技术大学 | Method for simultaneously measuring temperature and stress of fiber bragg gratings (obtained by corrosion) with different diameters |
| CN103791957A (en) * | 2014-03-03 | 2014-05-14 | 中国计量学院 | Fiber flow sensor based on metal-film-coated and long-period fiber bragg gratings |
| US20150036147A1 (en) * | 2013-07-30 | 2015-02-05 | Habsonic, Llc | Distributed microwave fabry-perot interferometer device and method |
| CN204389373U (en) * | 2014-12-19 | 2015-06-10 | 中国计量学院 | Based on the long-range surface plasmon resonance device of inclined optical fiber grating |
| CN204479209U (en) * | 2015-03-26 | 2015-07-15 | 中国矿业大学(北京) | Based on fluid temperature and the apparatus for measuring concentration of long period fiber grating |
| CN105158213A (en) * | 2015-09-11 | 2015-12-16 | 暨南大学 | Device and method for detecting glucose based on optical fiber surface plasma resonance |
| CN205664848U (en) * | 2016-06-03 | 2016-10-26 | 安徽工业大学 | Single -ended reflective long period fiber grating sensor |
-
2016
- 2016-06-03 CN CN201610410962.3A patent/CN105973279B/en active Active
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6275628B1 (en) * | 1998-12-10 | 2001-08-14 | Luna Innovations, Inc. | Single-ended long period grating optical device |
| CN101017139A (en) * | 2006-12-26 | 2007-08-15 | 重庆工学院 | Minisize multiplexing interfering biomolecule effect sensing method and probe |
| CN101042328A (en) * | 2007-04-26 | 2007-09-26 | 南京航空航天大学 | Monitoring methods for reinforcement corrosion of long period optical fiber grating and sensor thereof |
| US20090097807A1 (en) * | 2007-10-16 | 2009-04-16 | Xijia Gu | Shaping a laser beam with a fiber-based device |
| CN101545851A (en) * | 2009-04-27 | 2009-09-30 | 浙江大学 | Long period fiber grating-based reflection-type optical fiber biochemical sensor and manufacturing method thereof |
| CN201392311Y (en) * | 2009-04-27 | 2010-01-27 | 浙江大学 | Reflection-type optical fiber biochemistry sensor based on long period optical fiber grating |
| CN102183487A (en) * | 2011-02-11 | 2011-09-14 | 上海理工大学 | Manufacturing method of metal film plated double-humped resonance liquid sensor based on SPR (Surface Plasmon Resonance) |
| CN102829893A (en) * | 2012-09-20 | 2012-12-19 | 中国人民解放军国防科学技术大学 | Method for simultaneously measuring temperature and stress of fiber bragg gratings (obtained by corrosion) with different diameters |
| US20150036147A1 (en) * | 2013-07-30 | 2015-02-05 | Habsonic, Llc | Distributed microwave fabry-perot interferometer device and method |
| CN103791957A (en) * | 2014-03-03 | 2014-05-14 | 中国计量学院 | Fiber flow sensor based on metal-film-coated and long-period fiber bragg gratings |
| CN204389373U (en) * | 2014-12-19 | 2015-06-10 | 中国计量学院 | Based on the long-range surface plasmon resonance device of inclined optical fiber grating |
| CN204479209U (en) * | 2015-03-26 | 2015-07-15 | 中国矿业大学(北京) | Based on fluid temperature and the apparatus for measuring concentration of long period fiber grating |
| CN105158213A (en) * | 2015-09-11 | 2015-12-16 | 暨南大学 | Device and method for detecting glucose based on optical fiber surface plasma resonance |
| CN205664848U (en) * | 2016-06-03 | 2016-10-26 | 安徽工业大学 | Single -ended reflective long period fiber grating sensor |
Non-Patent Citations (2)
| Title |
|---|
| ZHAO MIN-FU等: "Single—ended LPFG Refractive Index Sensor Based on Metal—coated Surface Plasma Resonance", 《 OPTO—ELECTRONIC ENGINEERING》 * |
| 刘宏月 等: "基于长周期光纤光栅折射率敏感特性的混凝土结构钢筋锈蚀监测", 《光学学报》 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106932026A (en) * | 2017-04-24 | 2017-07-07 | 华中科技大学 | A kind of quasi-distributed seawater thermohaline sensor, measurement apparatus and its method |
| CN106932026B (en) * | 2017-04-24 | 2019-08-30 | 华中科技大学 | A kind of quasi-distributed seawater thermohaline sensor, measuring device and its method |
| CN109580984A (en) * | 2019-01-14 | 2019-04-05 | 浙江工业大学 | Air velocity transducer based on long-period fiber grating |
| CN111678539A (en) * | 2019-03-11 | 2020-09-18 | 新加坡国立大学 | Fiber grating sensor for surgical instrument |
| CN111678539B (en) * | 2019-03-11 | 2024-02-13 | 新加坡国立大学 | Fiber bragg grating sensor for surgical instruments |
| 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 |
| CN114777836A (en) * | 2022-03-10 | 2022-07-22 | 吉林大学 | Optical fiber high-temperature stress sensor based on yttrium aluminum garnet crystal derived optical fiber and preparation method thereof |
| CN114777836B (en) * | 2022-03-10 | 2023-12-05 | 吉林大学 | Optical fiber high-temperature stress sensor based on yttrium aluminum garnet crystal derived optical fiber and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105973279B (en) | 2019-03-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Paliwal et al. | Lossy mode resonance (LMR) based fiber optic sensors: A review | |
| CN105973279A (en) | Single-end reflective long-period fiber grating sensor and manufacture process thereof | |
| CN109187440B (en) | Single-mode-few-mode/multi-mode fiber SPR sensor based on mode excitation | |
| CN105651738A (en) | Helical-core optical fiber SPR sensor | |
| Hou et al. | Polymer optical fiber twisted macro-bend coupling system for liquid level detection | |
| Chu et al. | Influence of the sub-peak of secondary surface plasmon resonance onto the sensing performance of a D-shaped photonic crystal fibre sensor | |
| Zhang et al. | Surface plasmon resonance sensor based on a D-shaped photonic crystal fiber for high and low refractive index detection | |
| CN207964137U (en) | A kind of M-Z strain gauges based on femtosecond laser parallel micromachining | |
| Qiu et al. | Plasmonic fiber-optic refractometers based on a high Q-factor amplitude interrogation | |
| CN105842147B (en) | A kind of single-ended coated reflection formula long-period fiber grating sensor and its manufacture craft and monitoring steel bar corrosion method | |
| CN205664848U (en) | Single -ended reflective long period fiber grating sensor | |
| CN210953331U (en) | Novel U-shaped cascade long-period fiber grating sensor | |
| CN101710065A (en) | Thin core optical fiber mode interferometer sensor | |
| CN201181206Y (en) | Strain sensor based on optical fiber with porous micro-structure | |
| Liu et al. | Fiber SPR micro displacement sensor based on heterocore structure of graded index multimode fiber | |
| CN205665151U (en) | Reflective long period fiber grating sensor of single -ended coating film | |
| CN110823834A (en) | High-sensitivity SPR refractive index sensor based on plastic optical fiber periodic narrow groove structure | |
| CN110207849A (en) | A kind of temperature sensor and measurement method based on reflective long-period fiber grating | |
| Lu et al. | Characteristics of a capillary single core fiber based on SPR for hydraulic pressure sensing | |
| CN206696180U (en) | A kind of high index of refraction sensor based on mode excitation thin-core fibers | |
| CN110118614A (en) | The sapphire fiber grating sensor and its temperature checking method of anti-extreme environment | |
| CN210719242U (en) | Optical fiber sensor for measuring sea water temperature and salt depth | |
| Meng et al. | Refractive index sensing of twin-core fiber based on Mach Zehnder interference and SPR effect | |
| Chu et al. | Surface plasmon resonance sensors using silica‐on‐silicon optical waveguides | |
| CN106770042A (en) | A kind of high index of refraction sensor based on mode excitation thin-core fibers |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB03 | Change of inventor or designer information |
Inventor after: Wang Yan Inventor after: Hu Xingliu Inventor after: Fang Ting Inventor after: Zhang Jiayan Inventor after: Wang Bing Inventor before: Wang Yan Inventor before: Hu Xingliu Inventor before: Liu Jiaping Inventor before: Fang Ting |
|
| COR | Change of bibliographic data | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |