CN208091588U - Micro-nano long period fiber-optical grating temperature sensor based on glass capillary encapsulation - Google Patents
Micro-nano long period fiber-optical grating temperature sensor based on glass capillary encapsulation Download PDFInfo
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- CN208091588U CN208091588U CN201820575034.7U CN201820575034U CN208091588U CN 208091588 U CN208091588 U CN 208091588U CN 201820575034 U CN201820575034 U CN 201820575034U CN 208091588 U CN208091588 U CN 208091588U
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Abstract
The utility model is related to technical field of optical fiber sensing, especially a kind of micro-nano long period fiber-optical grating temperature sensor based on glass capillary encapsulation, it includes the three-stage fibre optic interferometer being made of input single mode optical fiber, micro-nano fiber and output single mode optical fiber, and inscription has one section of long period optical fiber grating on micro-nano fiber, a diameter of 4 μm~8 μm of the wherein described micro-nano fiber, the pitch of long-period fiber grating is 596 μm, and number of cycles is 42；It is packaged with glass capillary on the outside of the micro-nano fiber for having the long-period fiber grating inscribing, temperature sensitivity liquid is housed in glass capillary.The utility model is not only small, manufacture craft is simple, low manufacture cost, high certainty of measurement, strong antijamming capability, and high sensitivity, with stronger light field strong constraint ability, numerous advantages such as optical loss is low, evanscent field is strong, the temperature for being suitable for the various application occasions such as medical, bioengineering, chemical, food processing measures.
Description
Technical field
The utility model is related to technical field of optical fiber sensing, especially a kind of micro-nano based on glass capillary encapsulation grows week
Phase fiber-optical grating temperature sensor.
Background technology
In recent years, with the development of nanotechnology, being miniaturized of optical element integrated has become optical element development
An important directions.Loss is small, cheap, is easy to the advantages that batch production with it for micro-nano fiber, is widely used in visiting
The every field such as survey, medical treatment, communication, and play indispensable role.The manufacturing process and architectural characteristic of micro-nano fiber, it is micro-
Nano fiber for influence for the beam quality of output beam of modulation and micro-nano fiber of light field etc. by people increasingly
More concerns.
Micro-nano fiber be mainly used for conduct luminous energy, and with evanscent field is strong, flexibility is good, loss is low, optical coupling input and
Export the features such as facilitating.In addition, also having numerous characteristics：(1) the common single mode optical fiber of about beam ratio of the micro-nano fiber to field strength is strong,
The interaction of light and substance is enhanced, to generate higher-order nonlinear system when input is compared with low optical power；(2) in micro-nano light
In fibre, field strength has a big chunk Energy distribution on micro-nano fiber surface layer, can utilize the evanscent field and ring on micro-nano fiber surface
Border interacts, and researches and develops compact-sized, high sensitivity, micromation, cheap optical sensor.
Currently, using ordinary optic fibre as the long-period fiber grating of carrier（LPFG）It is transmission grating, when extraneous temperature is sent out
When changing, cause the variation of fibre core and cladding-effective-index, screen periods etc., so as to cause the variation of resonance wavelength, because
This, LPFG can be used as temperature sensor, and temperature control is characterized using the variation of wavelength relative temperature.The temperature spirit of LPFG
Sensitivity will be far above the temperature control of bragg grating (FBG).But LPFG is very sensitive to extraneous many factors, by
The long-period fiber grating sensor resonant bandwidth that general single mode fiber makes is larger, and centre wavelength is caused to be difficult to accurately measure,
In addition because its transmission spectrum bandwidth is bigger, if spectrometer resolution ratio is relatively low in measurement, larger wavelength readings can be caused to miss
Difference, while wavelength fluctuation caused by the interference of extraneous factor also can not be ignored.And long period optical fiber light is inscribed on micro-nano fiber
Why grid get the favour of people, and are because having inscribed long-period fiber grating again on micro-nano fiber, which has
The fibre optic interferometer of micro-nano fiber and long-period fiber grating two-fold advantage, formation is that micro-nano fiber and long-period fiber grating are double
The interference peaks of the effect of recast, generation become apparent from, and interference peaks are sensitiveer to temperature.Therefore, micro-nano fiber grating sensor phase
Than general fiber-optic grating sensor, with measurement accuracy higher, weight are lighter, structure is compacter, sensitivity higher, is convenient for
The advantages that optics integrates.
Invention content
The purpose of this utility model seeks to solve the temperature sensor that currently common long-period fiber grating is made
The problem of measurement accuracy is relatively low, and measuring temperature numerical value is easy to be influenced by external environment other parameters provides a kind of thus
Micro-nano long period fiber-optical grating temperature sensor based on glass capillary encapsulation.
The concrete scheme of the utility model is：Micro-nano long-period fiber grating temperature sensing based on glass capillary encapsulation
Device, it is characterized in that：Include the three-stage fibre optic interferometer being made of input single mode optical fiber, micro-nano fiber and output single mode optical fiber,
And inscription has one section of long period optical fiber grating, wherein a diameter of 4~8 μm of micro-nano fiber, long period optical fiber on micro-nano fiber
The pitch of grating is 596 μm, and number of cycles is 42；Inscribing side seal outside the micro-nano fiber for having the long-period fiber grating
Equipped with glass capillary, temperature sensitivity liquid is housed in glass capillary.
Micro-nano fiber described in the utility model is used with input single mode optical fiber and output single mode optical fiber with the general of model
Logical single mode optical fiber draws molding by oxyhydrogen flame fused conic clinker, wherein input single mode optical fiber and the covering for exporting single mode optical fiber are straight
Diameter is 125 μm, and core diameter is 9 μm；The long-period fiber grating is to use high frequency CO2Laser is on micro-nano fiber
It inscribes.
Glass capillary coaxial package described in the utility model in the outside of micro-nano fiber, glass capillary it is forward and backward
Both ends are integrated by fluid sealant and input single mode optical fiber, output single mode optical fiber sealing respectively, and wherein fluid sealant uses AB glue；Institute
It states temperature sensitivity liquid and uses isopropanol or alcohol.
The length of glass capillary described in the utility model is 4~5cm, and internal diameter is more than 125 μm.
The concrete operating principle of the utility model is：Fibre optic interferometer is the input that the input of bandwidth light source is used for by first segment
Single mode optical fiber, second segment inscribe the micro-nano fiber for having long-period fiber grating and third section is used to connect the output of fiber spectrometer
Single mode optical fiber forms.In inputting single mode optical fiber, light is in the waveguide that fibre core and covering are constituted with basic mode（Core mode）Form passes
It is defeated；When optical transport is to micro-nano fiber, since optical fiber parameter changes a lot（4~8 μm of micro-nano fiber size, input are single
9 μm of mode fiber core diameter）, micro-nano fiber grating is leaked to a light part existing for core mode originally in inputting single mode optical fiber
Covering in, inspire high-order mode, in the form of cladding mode propagate；Another part optical coupling into micro-nano fiber grating fibre core,
It is propagated with fibre core modular form.When light reaches the junction of micro-nano fiber and output single mode optical fiber, since optical fiber parameter occurs again
Prodigious variation（4~8 μm of micro-nano fiber size, 9 μm of output single mode optical fiber core diameter）, coupling conversion occurs between mould field again, this
When micro-nano fiber grating in the energy of high-order mode be coupled to basic mode again（Core mode）, make high-order cladding mode and core mode defeated
Go out and generate interference in single mode optical fiber, and interference illustration is exported from output single mode optical fiber.There is length due to being inscribed on micro-nano fiber again
Periodic optical grating makes the Mode Coupling between the cladding mode and core mode of optical fiber fl transmission convert and is easier, interference is made to be easier
Occur, it is easier to obtain fibre optic interferometer.
Since the cladding mode of micro-nano long-period fiber grating is in contact with liquid in extraneous glass tube, effective refractive index with
It the variations in refractive index of surrounding liquid and changes；Core mode is not contacted with environmental liquids, and effective refractive index remains unchanged,
Therefore, including two splice points and its between micro-nano long-period fiber grating can regard Mach-coaxial in optical fiber as once
Deccan interferometer, the fibre core and covering of micro-nano long-period fiber grating are respectively served as reference arm and pickup arm.If their phase
Difference is the even-multiple of π, then corresponds to the wave crest in fibre optic interferometer transmitted spectrum, if cladding mode and core mode phase difference are π's
Odd-multiple then corresponds to the trough in fibre optic interferometer transmitted spectrum.Therefore, the variation of environmental liquids refractive index will cause optical fiber to have
So as to cause wave crest or the trough corresponding wavelength of fibre optic interferometer transmitted spectrum linear drift occurs for the change for imitating refractive index.
If this fibre optic interferometer to be immersed to the liquid of temperature sensitive property（Isopropanol or alcohol）In, since the liquid refractivity is with temperature
Notable linear change occurs for degree variation, therefore the transmitted spectrum of the fibre optic interferometer can occur accordingly with the variation of environment temperature
Linear drift, the drift value by measuring wavelength can indirect measuring environment temperature.In addition, due to being carved on micro-nano fiber again
Long-period fiber grating is write, which has micro-nano fiber and long-period fiber grating two-fold advantage, the optical fiber of formation dry
Interferometer is the effect of micro-nano fiber and long-period fiber grating double action, and the interference peaks of generation become apparent from, and interference peaks are to temperature
It is sensitiveer.Therefore, which can improve the sensitivity of temperature measurement to the maximum extent, while have stronger constraint energy to light
Power, it is easier to form optical integrated device.
The utility model is simple in structure, ingenious in design, by inputting, exporting single mode optical fiber and encapsulated based on glass capillary
Micro-nano long-period fiber grating composition fibre optic interferometer, the highly sensitive of environment temperature is realized to temperature using the interferometer
Degree measures.The sensor is not only small, manufacture craft is simple, low manufacture cost, high certainty of measurement, and measurement data is not by the external world
Environment other factors influence；And high sensitivity, have that stronger light field strong constraint ability, optical loss is low, evanscent field is strong etc.
Numerous advantages, the temperature especially suitable for a variety of occasions such as physical detection, medical, bioengineering, chemical, food processing
Degree measures.
Description of the drawings
Fig. 1 is the structural schematic diagram of the utility model；
Fig. 2 is the utility model in the structural schematic diagram being detected to temperature.
In figure：1-input single mode optical fiber, 2-micro-nano fibers, 3-output single mode optical fibers, 4-long-period fiber grating,
5-glass capillaries, 6-temperature sensitivity liquid, 7-fluid sealants, 8-wideband light sources, 9-fiber spectrometers, 10-is controllable
Temperature field.
Specific implementation mode
Referring to Fig. 1, a kind of micro-nano long period fiber-optical grating temperature sensor based on glass capillary encapsulation, including by defeated
Enter the three-stage fibre optic interferometer that single mode optical fiber 1, micro-nano fiber 2 and output single mode optical fiber 3 are constituted, and is carved on micro-nano fiber 2
With one section of long period optical fiber grating 4；It is packaged with capillary inscribing 2 outside of micro-nano fiber for having the long-period fiber grating 4
Glass tube 5, glass capillary 5 is interior to be equipped with temperature sensitivity liquid 6.
The preparation process of the utility model is as follows：
The first step：Take one section of single mode optical fiber for peelling off coat, the model of the optical fiber G.652, cladding diameter 125
μm, core diameter is 9 μm, and the optical fiber is fixed in the electric control platform of oxyhydrogen flame fused conic clinker, passes through the stepping on both sides
Machine moves left and right simultaneously, draws out one section of relatively uniform micro-nano fiber, a diameter of 4~8 μm of the micro-nano fiber；
Second step：Use high frequency CO2Laser inscribes one section of long period optical fiber grating 4 on the micro-nano fiber 2 drawn, if
Pitch Λ=596 μm of grating are set, number of cycles N=42 inscribe under this parameter and obtain long-period fiber grating；
Third walks：The micro-nano fiber both sides optical fiber cutters cutting for being carved with long-period fiber grating is smooth, then two
Side is welded together with input single mode optical fiber and output single mode optical fiber face respectively, fibre optic interferometer is made;
4th step：The fibre optic interferometer prepared is interted in the glass capillary 5 into internal diameter more than 125 microns, wherein
5 coaxial package of the glass capillary ensures that micro-nano fiber and both sides connecting portion are completely in hair in the outside of micro-nano fiber 2
In thin glass tube, wherein the length of the glass capillary 5, in 4~5cm, internal diameter can specifically be chosen for 150 μm；
5th step：The glass capillary for being inserted with fibre optic interferometer is placed vertically, is dripped at the diameter of port on the capillary
Temperature sensitivity liquid 6, such as isopropanol, alcohol, which can quickly fill with capillary glass and fiber optic interferometric under Gravitative Loads
The interlayer space that instrument is surrounded；
6th step：The front and rear ends of glass capillary 5 pass through fluid sealant 7 and input single mode optical fiber 1, output single mode respectively
The sealing of optical fiber 3 is integrated, and wherein fluid sealant 7 uses AB glue, the micro-nano long period optical fiber light so far based on glass capillary encapsulation
Grid temperature sensor is prepared and is completed.
Referring to Fig. 2, in use, the input single mode optical fiber 1 of fibre optic temperature sensor and output single mode optical fiber 3 correspond to respectively
It is connected with wideband light source 8 and fiber spectrometer 9.This fibre optical sensor is placed in controllable temperature field 10, sensor week is changed
Enclose environment temperature, you can obtain under one group of known temperature characteristic peak wavelength value in the transmitted spectrum of fibre optical sensor.Applied mathematics
Analysis, obtains the respective function relationship of characteristic peak wavelength value and temperature, that is, completes the calibration of sensor.By scaled optical fiber
Sensor is placed in temperature field to be measured, characteristic peak wavelength value and scaling function relationship in the transmitted spectrum obtained according to measurement, i.e.,
It would know that the temperature in temperature field to be measured.
Claims (4)
1. based on the micro-nano long period fiber-optical grating temperature sensor of glass capillary encapsulation, it is characterized in that：Including single by input
The three-stage fibre optic interferometer that mode fiber, micro-nano fiber and output single mode optical fiber are constituted, and inscription has one section on micro-nano fiber
Long-period fiber grating, wherein a diameter of 4 μm~8 μm of the micro-nano fiber, the pitch of long-period fiber grating is 596 μm,
Its number of cycles is 42；It is packaged with glass capillary, capillary on the outside of the micro-nano fiber for inscribing the long-period fiber grating
Temperature sensitivity liquid is housed in glass tube.
2. the micro-nano long period fiber-optical grating temperature sensor according to claim 1 based on glass capillary encapsulation,
It is characterized in：The micro-nano fiber is to pass through hydrogen-oxygen with the single mode optical fiber of model using with input single mode optical fiber and output single mode optical fiber
Flame fused conic clinker draws molding, wherein input single mode optical fiber and the cladding diameter for exporting single mode optical fiber are 125 μm, fibre core is straight
Diameter is 9 μm；The long-period fiber grating is to use high frequency CO2Laser is inscribed on micro-nano fiber.
3. the micro-nano long period fiber-optical grating temperature sensor according to claim 1 based on glass capillary encapsulation,
It is characterized in：The glass capillary coaxial package is in the outside of micro-nano fiber, and the front and rear ends of glass capillary are respectively by close
Sealing is integrated with input single mode optical fiber, output single mode optical fiber sealing, and wherein fluid sealant uses AB glue；The temperature sensitivity liquid
Body uses isopropanol or alcohol.
4. the micro-nano long-period fiber grating temperature sensing according to claim 1 or 2 or 3 based on glass capillary encapsulation
Device, it is characterized in that：The length of the glass capillary is 4~5cm, and internal diameter is more than 125 μm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820575034.7U CN208091588U (en) | 2018-04-23 | 2018-04-23 | Micro-nano long period fiber-optical grating temperature sensor based on glass capillary encapsulation |
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| CN201820575034.7U CN208091588U (en) | 2018-04-23 | 2018-04-23 | Micro-nano long period fiber-optical grating temperature sensor based on glass capillary encapsulation |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109668652A (en) * | 2019-02-28 | 2019-04-23 | 武汉工程大学 | A kind of optical fibre temperature survey apparatus of glass tube filling |
| CN110044516A (en) * | 2019-05-29 | 2019-07-23 | 南京信息工程大学 | One kind exempting from welding F-P cavity optical fiber temperature sensing device and preparation method thereof |
| CN110426781A (en) * | 2019-08-05 | 2019-11-08 | 燕山大学 | A kind of adjustable liquid cladding micro-nano fiber long-period gratings in broadband |
| CN110926646A (en) * | 2019-11-13 | 2020-03-27 | 重庆大学 | Micro-nano optical fiber method-amber sensor for high-speed dynamic temperature measurement and manufacturing method |
| CN110926647A (en) * | 2019-11-13 | 2020-03-27 | 重庆大学 | Micro-nano fiber grating sensor for high-speed dynamic temperature measurement and manufacturing method thereof |
| CN111220296A (en) * | 2020-01-21 | 2020-06-02 | 金华伏安光电科技有限公司 | Microcavity type temperature sensor and system |
-
2018
- 2018-04-23 CN CN201820575034.7U patent/CN208091588U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109668652A (en) * | 2019-02-28 | 2019-04-23 | 武汉工程大学 | A kind of optical fibre temperature survey apparatus of glass tube filling |
| CN109668652B (en) * | 2019-02-28 | 2020-10-23 | 武汉工程大学 | Optical fiber temperature measuring device filled with glass tube |
| CN110044516A (en) * | 2019-05-29 | 2019-07-23 | 南京信息工程大学 | One kind exempting from welding F-P cavity optical fiber temperature sensing device and preparation method thereof |
| CN110426781A (en) * | 2019-08-05 | 2019-11-08 | 燕山大学 | A kind of adjustable liquid cladding micro-nano fiber long-period gratings in broadband |
| CN110926646A (en) * | 2019-11-13 | 2020-03-27 | 重庆大学 | Micro-nano optical fiber method-amber sensor for high-speed dynamic temperature measurement and manufacturing method |
| CN110926647A (en) * | 2019-11-13 | 2020-03-27 | 重庆大学 | Micro-nano fiber grating sensor for high-speed dynamic temperature measurement and manufacturing method thereof |
| CN111220296A (en) * | 2020-01-21 | 2020-06-02 | 金华伏安光电科技有限公司 | Microcavity type temperature sensor and system |
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