CN206161192U - Interference type optical fiber temperature sensor based on capillary glass tube encapsulation - Google Patents
Interference type optical fiber temperature sensor based on capillary glass tube encapsulation Download PDFInfo
- Publication number
- CN206161192U CN206161192U CN201621222098.6U CN201621222098U CN206161192U CN 206161192 U CN206161192 U CN 206161192U CN 201621222098 U CN201621222098 U CN 201621222098U CN 206161192 U CN206161192 U CN 206161192U
- Authority
- CN
- China
- Prior art keywords
- fiber
- glass capillary
- glass tube
- lpfg
- capillary glass
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The utility model provides an interference type optical fiber temperature sensor based on capillary glass tube encapsulation, includes two coaxial single mode fiber that arrange, a long period fiber gratings and a capillary glass tube, two single mode fiber regard as light source input and output respectively, and long period fiber gratings dislocation butt fusion is between two single mode fiber to constitute the optic fiber interference appearance, the capillary glass tube suit is on the optic fiber interference appearance to capillary glass tube's both ends are packaged with temperature sensitivity liquid respectively through sealed gluey sealed as an organic whole with two single mode fiber in capillary glass tube, the utility model discloses not only simple manufacture, low cost, temperature measurement's range is big moreover, sensitivity is high.
Description
Technical field
This utility model is related to a kind of LPFG interferometric temperature sensor, especially a kind of to be based on capillary glass
The Interference optical-fiber temperature sensors of glass pipe encapsulation.
Background technology
In recent years, fibre optic temperature sensor because its anti-electromagnetic interference capability it is strong, small volume, fast response time, and can be
The advantage of remote monitoring remote sensing survey is worked and facilitated under adverse circumstances, and is subject to widely studied.
Various structures and manufacturing technology are applied to build different types of fibre optic temperature sensor, existing optical fiber temperature
Degree sensor main will include two kinds：Intensity modulation type and wavelength modulation type.The former, the light stability requirement to light source is higher,
Generally by the way of reference path come the impact of compensatory light unstable factor, and the complexity of system need to be this thereby necessarily increases
Property；The temperature of the change demodulation object under test that the latter passes through detection specific output optical wavelength, reduces to light source intensity stability
Requirement, with measuring system is stable, reproducible advantage.
There is the fibre optic temperature sensor of several comparative maturities at present, for example：Distributed optical fiber temperature sensor belongs to
Contact functional type temperature sensor.When laser pulse is transmitted in a fiber, Rayleigh scattering can be produced, Brillouin scattering and
Raman scattering phenomenon, therefore distributed temperature sensor mainly has based on Rayleigh scattering, Brillouin scattering, three kinds of Raman scattering is existing
The distributed temperature sensor of elephant, current distributed optical fiber temperature sensor is mainly based upon Raman scattering effect and optical time domain is anti-
Penetrate meter technology to realize temperature survey.Distributed optical fiber temperature sensor sensitivity is very high and temperature-measuring range is wide, but it is fabricated to
This is very high.Another is exactly optical fiber fluorescence temperature sensor, and it is to irradiate light beam on the fluorescent substance, is allowed to be excited
Luminescence phenomenon is produced, the temperature of environment is determined by fluorescence intensity or fluorescence lifetime.Optical fiber fluorescence temperature sensor has
There is sensitivity high, life-span length, the advantages of strong adaptability, but its complex manufacturing technology and cost of manufacture is higher.Recently, Yi Zhongji
In permselective photonic crystal fiber temperature sensor, injection is high in certain or certain several micropores of photonic crystal fiber
The liquid of thermo-optical coeffecient, this kind of sensor has the moisture sensitivity of superelevation, even up to 54.3nm/ DEG C within the specific limits.
But the range of this sensor is narrower, and manufacturing process is complicated, and if desired for being applied to femtosecond laser parallel micromachining etc., it is using receiving
To restriction.
The content of the invention
The purpose of this utility model seek to solve current optical fiber temperature sensor exist complex manufacturing technology, high cost,
Sensitivity is low or the problems such as little range, for this kind of Interference optical-fiber temperature sensors encapsulated based on glass capillary provided.
Concrete scheme of the present utility model is：A kind of Interference optical-fiber temperature sensors encapsulated based on glass capillary,
It is characterized in that：Including two coaxially arranged single-mode fibers, a LPFG and a glass capillary；Two lists
Mode fiber respectively as light source input and outfan, LPFG dislocation welding between two single-mode fibers, with
Constitute fibre optic interferometer；Glass capillary is sleeved on fibre optic interferometer, and the two ends of glass capillary are respectively by sealing
Glue is integrated with two single-mode fiber sealings, and temperature sensitivity liquid is packaged with glass capillary.
The fibre core of LPFG described in this utility model is with the length of the fibre core dislocation of two single-mode fibers
2-4μm。
LPFG described in this utility model by single-mode fiber after coat is peelled off, using high frequency CO2Swash
Light device is directly inscribed and is prepared from, and its screen periods is 596 μm, and grating fringe number is 42, and grating length is 25mm.
Temperature sensitivity liquid described in this utility model is isopropanol or ethanol, and fluid sealant is AB glue.
Concrete operating principle of the present utility model is:By with high frequency CO2Laser instrument inscribes long period on single-mode fiber
Fiber grating, then by the both sides of this LPFG and single-mode fiber dislocation welding, with this prepared fibre optic interferometer.It is single
Mode fiber when with LPFG welding, have adjusted fiber end face just to area, cause two optical fiber at fusion point
Without perfectly aligned, so as to the light part existed with core mode originally in first junction input single-mode fiber is revealed
To in the covering of second segment fiber grating, propagated in the form of cladding mode；Another part optical coupling enters second segment fiber grating
Fibre core, with the propagation of fibre core modular form.Cladding mode and core mode meet at second fusion point and produce interference, due to middle connection
There is LPFG interference is easily occurred, the modular form for then coupling is exported from outfan single-mode fiber.Due to
Cladding mode contacts with liquid in extraneous glass tubing, and its effective refractive index becomes with the variations in refractive index of surrounding liquid
Change；Core mode is not contacted with environmental liquids, and its effective refractive index keeps constant, therefore, including two splice points and its between
LPFG can regard Mach-Zehnder interferometer coaxial in optical fiber as, and fibre core and covering each act as reference arm
And pickup arm.If even-multiple of the phase contrast for π, corresponds to the crest in fibre optic interferometer transmitted spectrum, if cladding mode and
Core mode phase contrast is the odd-multiple of π, then correspond to the trough in fibre optic interferometer transmitted spectrum.Fibre optic interferometer transmitted spectrum
Crest or the corresponding wavelength of trough change with the change of environmental liquids refractive index.By this fibre optic interferometer immersion temperature
The liquid of sensitivity（Isopropanol or ethanol）In, because liquid refractivity varies with temperature generation significant changes, therefore the optical fiber
The transmitted spectrum of interferometer can occur corresponding drift with the change of ambient temperature, just can be surveyed by measuring the drift value of wavelength
Amount ambient temperature.In addition, single-mode fiber has an optimal dislocation junction point when being connected with LPFG dislocation, in this place
It is easiest to interfere, it is possible to increase the sensitivity of the sensor for temperature.Finally, LPFG enters with single-mode fiber
Line misregistration welding, can produce the larger interference fringe of more strength ratios, and using different interference fringes many reference amounts can be carried out
While measure, improve the range of application of the sensor.
This utility model together with two single-mode fiber dislocation weldings by LPFG by making optical fiber
Interferometer, and suit is packaged with the glass capillary of temperature sensitivity liquid outside fibre optic interferometer, with this prepared fiber optic temperature
Sensor, so as to this utility model not only makes simple, with low cost, and thermometric range is big, sensitivity is high.
Description of the drawings
Fig. 1 is structural representation of the present utility model.
In figure：1-glass capillary, 2-fibre optic interferometer, 2a-single-mode fiber, 2b-single-mode fiber, 2c-long period
Fiber grating, 3-fluid sealant, 4-temperature sensitivity liquid, 5-wideband light source, 6-fiber spectrometer.
Specific embodiment
Referring to Fig. 1, a kind of Interference optical-fiber temperature sensors encapsulated based on glass capillary, including two coaxially arranged
Single-mode fiber 2a and 2b, a LPFG 2c and a glass capillary 1；Single-mode fiber 2a is used as the defeated of light source
Enter end, single-mode fiber 2b as light source outfan, LPFG 2c dislocation weldings between two single-mode fibers, with
Constitute fibre optic interferometer 2；Glass capillary 1 is sleeved on fibre optic interferometer 2, and the two ends of glass capillary 1 pass through respectively
Fluid sealant 3 is integrated with two single-mode fiber 2a and 2b sealings, and gasification temperature is packaged with 70 DEG C～80 in glass capillary 1
DEG C temperature sensitivity liquid 4.
The fibre core dislocation of the fibre core of LPFG 2c described in the present embodiment and two single-mode fibers 2a and 2b
Length is 2-4 μm, specially 2 μm.
LPFG 2c described in the present embodiment by single-mode fiber after coat is peelled off, using high frequency CO2Swash
Light device is directly inscribed and is prepared from, and its screen periods is 596 μm, and grating fringe number is 42, and grating length is 25mm.
Temperature sensitivity liquid described in the present embodiment 4 is isopropanol or ethanol, and fluid sealant 3 is AB glue.
Manufacturing process of the present utility model is as follows：
The first step：Use high frequency CO2Laser instrument inscribes a LPFG.Take one section of general single mode fiber and peel off painting
Coating horizontal positioned is to high frequency CO2Under laser instrument, setting pitch is Λ=596 μm, and number of cycles isN =42.In this parameter
Under can inscribe and obtain LPFG；
Second step：By smooth and both sides the single-mode fiber welding of optical fiber cutter cutting of LPFG both sides,
So that two fiber cores occur to a certain degree to misplace at fusion point, so that fibre optic interferometer, wherein LPFG is obtained
The fibre core dislocation length of fibre core and two single-mode fibers is 2 μm;
3rd step：The fibre optic interferometer for having prepared is interted in the glass capillary into internal diameter more than 125 microns, it is ensured that long
Period optical fiber grating and both sides connecting portion are completely in glass capillary；
4th step：The glass capillary for being inserted with fibre optic interferometer is vertically placed, is dripped at the footpath of port on the capillary
The liquid of temperature sensitivity, such as isopropanol, ethanol, the liquid can quickly fill with capillary glass and fiber optic interferometric under Gravitative Loads
The mezzanine space that instrument is surrounded；
5th step：The two ends of glass capillary are sealed with the side wall of two single-mode fibers with AB glue, is so far based on
The Interference optical-fiber temperature sensors of glass capillary encapsulation are prepared and completed.
In use, two single-mode fibers 2a and 2b of fibre optic temperature sensor input and outfan are passed through into what is commonly used
General single mode fiber correspondence is connected with wideband light source 5 and fiber spectrometer 6.This Fibre Optical Sensor is placed in controllable temperature field,
Change sensor ambient temperature, you can some for obtaining Fibre Optical Sensor transmitted spectrum under one group of known temperature is specific
Resonance peak wavelength value.Applied mathematics are analyzed, and obtain the respective function relation of resonance peak wavelength value and temperature, that is, complete sensor
Calibration.Scaled Fibre Optical Sensor is placed in temperature field to be measured, the resonance spike of the transmitted spectrum obtained according to measurement
Long value and scaling function relation, you can know the temperature in temperature field to be measured.
Claims (4)
1. a kind of Interference optical-fiber temperature sensors encapsulated based on glass capillary, is characterized in that：It is coaxially arranged including two
Single-mode fiber, a LPFG and a glass capillary；Two single-mode fibers are respectively as light source input
And outfan, LPFG dislocation welding between two single-mode fibers, to constitute fibre optic interferometer；Glass capillary
It is sleeved on fibre optic interferometer, and the two ends of glass capillary are sealed into one by fluid sealant and two single-mode fibers respectively
Body, is packaged with temperature sensitivity liquid in glass capillary.
2. it is according to claim 1 it is a kind of based on glass capillary encapsulate Interference optical-fiber temperature sensors, its feature
It is：The length of the fibre core dislocation of the fibre core of the LPFG and two single-mode fibers is 2-4 μm.
3. it is according to claim 1 it is a kind of based on glass capillary encapsulate Interference optical-fiber temperature sensors, its feature
It is：The LPFG by single-mode fiber after coat is peelled off, using high frequency CO2Laser instrument directly inscribe preparation and
Into, and its screen periods is 596 μm, grating fringe number is 42, and grating length is 25mm.
4. it is according to claim 1 it is a kind of based on glass capillary encapsulate Interference optical-fiber temperature sensors, its feature
It is：The temperature sensitivity liquid is isopropanol or ethanol, and fluid sealant is AB glue.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621222098.6U CN206161192U (en) | 2016-11-14 | 2016-11-14 | Interference type optical fiber temperature sensor based on capillary glass tube encapsulation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621222098.6U CN206161192U (en) | 2016-11-14 | 2016-11-14 | Interference type optical fiber temperature sensor based on capillary glass tube encapsulation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206161192U true CN206161192U (en) | 2017-05-10 |
Family
ID=58659174
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621222098.6U Expired - Fee Related CN206161192U (en) | 2016-11-14 | 2016-11-14 | Interference type optical fiber temperature sensor based on capillary glass tube encapsulation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206161192U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108195485A (en) * | 2017-12-29 | 2018-06-22 | 北京信息科技大学 | Temperature and the biparameter sensor of strain and preparation method thereof are measured based on LPFG and MZ cascades |
| CN108279079A (en) * | 2018-01-08 | 2018-07-13 | 东北大学 | A kind of point type temperature sensing device coating dimethyl silicone polymer based on coreless fiber radial direction serious mistake bit architecture |
| CN109142278A (en) * | 2018-09-14 | 2019-01-04 | 华北电力大学（保定） | A kind of measurement method of seawater salinity |
| CN109211839A (en) * | 2018-09-01 | 2019-01-15 | 哈尔滨工程大学 | A kind of binary channels side-hole fiber grating sensing device |
| CN109682779A (en) * | 2019-01-16 | 2019-04-26 | 北京信息科技大学 | Femtosecond laser prepares fiber core mismatch type FBG temperature strain refractive index measurement method |
| CN112230327A (en) * | 2020-10-28 | 2021-01-15 | 胡仲春 | Full-glass packaging device and packaging method for fiber bragg grating |
-
2016
- 2016-11-14 CN CN201621222098.6U patent/CN206161192U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108195485A (en) * | 2017-12-29 | 2018-06-22 | 北京信息科技大学 | Temperature and the biparameter sensor of strain and preparation method thereof are measured based on LPFG and MZ cascades |
| CN108279079A (en) * | 2018-01-08 | 2018-07-13 | 东北大学 | A kind of point type temperature sensing device coating dimethyl silicone polymer based on coreless fiber radial direction serious mistake bit architecture |
| CN109211839A (en) * | 2018-09-01 | 2019-01-15 | 哈尔滨工程大学 | A kind of binary channels side-hole fiber grating sensing device |
| CN109211839B (en) * | 2018-09-01 | 2021-01-12 | 哈尔滨工程大学 | Double-channel side hole fiber grating sensing device |
| CN109142278A (en) * | 2018-09-14 | 2019-01-04 | 华北电力大学（保定） | A kind of measurement method of seawater salinity |
| CN109682779A (en) * | 2019-01-16 | 2019-04-26 | 北京信息科技大学 | Femtosecond laser prepares fiber core mismatch type FBG temperature strain refractive index measurement method |
| CN112230327A (en) * | 2020-10-28 | 2021-01-15 | 胡仲春 | Full-glass packaging device and packaging method for fiber bragg grating |
| CN112230327B (en) * | 2020-10-28 | 2022-05-24 | 胡仲春 | Full-glass packaging device and packaging method for fiber bragg grating |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN206161192U (en) | Interference type optical fiber temperature sensor based on capillary glass tube encapsulation | |
| Zhao et al. | Relative humidity sensor based on hollow core fiber filled with GQDs-PVA | |
| CN102323239B (en) | Refractive index sensor based on asymmetric double-core optical fiber | |
| CN100529735C (en) | Temperature and solidification rate real-time monitoring device for polymer based composite material forming process | |
| CN208091588U (en) | Micro-nano long period fiber-optical grating temperature sensor based on glass capillary encapsulation | |
| CN203224447U (en) | Refractive rate sensor based on fine-core fiber MZ (Mach-Zehnder) interferometer | |
| CN110987230B (en) | Double-parameter optical fiber sensing module and system | |
| CN102226725B (en) | Inner-wall waveguide long-time cycle fiber grating sensor | |
| CN105371785B (en) | A kind of curvature measurement method | |
| CN102494874B (en) | Tunable laser type fiber Bragg grating wavelength demodulation device | |
| CN202041222U (en) | In-wall waveguide long-period fiber grating sensor | |
| Silva et al. | New advances in fiber cavity ring-down technology | |
| CN109186736A (en) | It is a kind of can fixing frequency displacement structure slope auxiliary Brillouin fiber optic sensing vibration measurement device and measurement method | |
| Li et al. | Simultaneous measurement of RI and temperature based on a composite interferometer | |
| CN110954239A (en) | Temperature sensor based on double-core single-hole optical fiber | |
| CN206618510U (en) | A kind of transmission-type fibre optic temperature sensor of multi-core fiber dislocation welding | |
| CN114137273B (en) | Temperature-sensitive current eliminating sensing device of FBG cascade optical fiber composite structure | |
| Luo et al. | Relative humidity and temperature sensing characteristics of an optical fiber probe based on hollow-core fiber and calcium alginate hydrogel film | |
| Lin et al. | Research on characteristics of wedge-shaped open-cavity Mach–Zehnder sensing structure for seawater temperature | |
| Lokman et al. | Tapered fiber coated with hydroxyethyl cellulose/polyvinylidene fluoride composite for relative humidity sensor | |
| CN203719653U (en) | Inclination-angle sensor of photonic-crystal optical fiber on basis of demodulation of optical-fiber Bragg grating | |
| CN203595562U (en) | Interference-type fiber optic temperature sensor based on capillary-tube liquid packaging | |
| CN114137446B (en) | Temperature-sensitive magnetic field eliminating sensing device of FBG cascade optical fiber composite structure | |
| Jiang et al. | Precise measurement of liquid-level by fiber loop ring-down technique incorporating an etched fiber | |
| CN109682779A (en) | Femtosecond laser prepares fiber core mismatch type FBG temperature strain refractive index measurement method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170510 Termination date: 20171114 |