CN109813459A - A kind of M-Z fibre optic interferometer temperature sensor and preparation method thereof - Google Patents
A kind of M-Z fibre optic interferometer temperature sensor and preparation method thereof Download PDFInfo
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- CN109813459A CN109813459A CN201910131326.0A CN201910131326A CN109813459A CN 109813459 A CN109813459 A CN 109813459A CN 201910131326 A CN201910131326 A CN 201910131326A CN 109813459 A CN109813459 A CN 109813459A
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Abstract
The invention discloses a kind of M-Z fibre optic interferometer temperature sensors, including the first single mode optical fiber, the second single mode optical fiber, optics coat；First single mode optical fiber has first end face and second end face along core layer extending direction, and the second single mode optical fiber has third end face and the 4th end face along core layer extending direction；The second end face of first single mode optical fiber and the third end face welding of the second single mode optical fiber, and connect in weld, two core layers but the two central point is misaligned；A shrinkage pool is provided in the first end face of first single mode optical fiber；The optics coat is wrapped on the outside of the first single mode optical fiber, and both ends are concordant with two end faces of the first single mode optical fiber；The thermo-optical coeffecient of the optics coat is greater than the thermo-optical coeffecient of the covering of the first single mode optical fiber, and the refractive index of optics coat is lower than the refractive index of the covering of the first single mode optical fiber.The present invention has many advantages, such as ultra-high temperature sensitivity, simple convenient for applying and making.
Description
Technical field
The present invention relates to M-Z fibre optic interferometer technical fields, in particular to a kind of M-Z fibre optic interferometer temperature sensing
Device and preparation method thereof.
Background technique
Fibre optical sensor can be widely used in reflecting due to being widely used and there are particular advantages to become research hotspot
Rate, temperature, pressure, strain and crooked sensory etc., particular advantages include electromagnetism interference, compact-sized and radiation resistance
It can wait by force.
In recent years, it was furtherd investigate for the fibre optical sensor of temperature sensing, and develops various temperature sensing
Device, such as fiber grating, F-P fibre optic interferometer and M-Z fibre optic interferometer, wherein M-Z fibre optic interferometer includes taper, fibre core
Diameter mismatch type and groove structure type etc..However the sensitivity for being commonly used to the fibre optical sensor of temperature sensing at present is all compared
It is lower, the temperature sensitivity of fiber bragg grating down to~10pm/ DEG C, and the temperature sensitivity of long-period fiber grating be~
100pm/ DEG C, but long-period grating pair bending and the external refractive index have big cross-sensitivity, are unsuitable for actually answering
With.The temperature sensitivity of F-P fibre optical sensor based on air chamber is down to~1pm/ DEG C, and the F-P optical fiber based on polymer cavity
The temperature sensitivity of sensor can reach~100pm/ DEG C of rank, need the injection of polymer in optical fiber connector or F-P, production
Difficulty is very big, is difficult to control.The temperature sensitivity of M-Z fibre optic interferometer is generally tens pm/ DEG C, M-Z fibre optic interferometer bubble
Its temperature sensitivity can be improved by entering in the liquid of temperature sensitive, but this causes its encapsulation difficulty to increase, and is not easy to apply.
Summary of the invention
It is an object of that present invention to provide a kind of M-Z fibre optic interferometer temperature sensors and preparation method thereof, dry in M-Z optical fiber
It relates to and coats one layer of NOA1315 low-index material outside structure, significantly improve its sensitivity, while can protect removal coat
Optical fiber.In addition, the M-Z fibre optic interferometer temperature sensor is insensitive to the external refractive index, can effectively solve in temperature
The interference problem of the external refractive index when measurement.M-Z fibre optic interferometer temperature sensor proposed by the present invention has ultra-high temperature spirit
Sensitivity, convenient for applying and make the advantages that simple.
To reach above-mentioned purpose, in conjunction with Fig. 1, the present invention proposes a kind of M-Z fibre optic interferometer temperature sensor, the M-Z
Fibre optic interferometer temperature sensor includes the first single mode optical fiber, the second single mode optical fiber, optics coat.
First single mode optical fiber, the second single mode optical fiber are made of core layer and the covering being wrapped in outside core layer.
First single mode optical fiber has first end face and second end face, the second single mode optical fiber edge along core layer extending direction
Core layer extending direction has third end face and the 4th end face.
The second end face of first single mode optical fiber and the third end face welding of the second single mode optical fiber, and weld,
Two core layers connect but the two central point is misaligned.
In some instances, first single mode optical fiber, the structure of the second single mode optical fiber are identical, for example, by a single mode
Fiber cut, respectively as the first single mode optical fiber and the second single mode optical fiber, can make the propagation of incident light with more rule at two sections
Rule property, while core layer dislocation distance is easier to manage when welding.
Preferably, the core layer central point of first single mode optical fiber, the second single mode optical fiber is at a distance of 4.5um, this distance
Enable the first single mode optical fiber, the second single mode optical fiber while guaranteeing effectively connection, constitutes recognizable phase difference.
A shrinkage pool is provided in the first end face of first single mode optical fiber, the main function of shrinkage pool is to destroy waveguide junction
Structure is dissipated into incident light in the covering of the first single mode optical fiber.
Preferably, the shrinkage pool is in cylindrical type.More preferred, the diameter of the shrinkage pool is 6um.
The optics coat is wrapped on the outside of the first single mode optical fiber, and two end faces of both ends and the first single mode optical fiber are flat
Together.
Preferably, the optics coat is 20mm along the length of core layer extending direction.
The thermo-optical coeffecient of the optics coat is greater than the thermo-optical coeffecient of covering, and the refractive index of optics coat is lower than covering
Refractive index.Preferably, the optics coat uses NOA1315 photo-curable glue, it should be understood that optics coat can also be with
The material for selecting other to meet optical parameter condition is made, and the present invention proposes the preferred example of selection NOA1315 photo-curable glue,
In addition to because of the property parameters of its low-refraction, high thermo-optical coeffecient, also as it is made with easy production, to optical fiber with protection
The advantages of using.
For example, on the one hand can be improved temperature in one layer of low-index material NOA1315 of the first single mode optical fiber outer application
The sensitivity of sensor, on the other hand, photo-curable glue coat can protect the optical fiber for removing former coat.
At aperture welded joint, input optical signal is divided into two optical path light beams, partial light transmission to the first single mode optical fiber
Covering and propagate as cladding mode, rest part, which is maintained in the core layer of the first single mode optical fiber, to be propagated and as substantially fine
Core mode propagation.It is coupled back into core mode again when the light beam of clad section is propagated by misconstruction.Fibre core and cladding mode
M-Z interference is formed between formula there are phase difference.Since the thermo-optical coeffecient of SiO2 is lower, at one layer of the first single mode optical fiber outer application
It can effectively improve the sensitivity of temperature sensor with the low-index material NOA1315 of larger thermo-optical coeffecient.
In other examples, the M-Z fibre optic interferometer temperature sensor further includes third single mode optical fiber.
The third single mode optical fiber has the 5th end face and the 6th end face along core layer extending direction.
6th end face of the third single mode optical fiber and the first end face welding of the first single mode optical fiber, and two fibres of weld
Sandwich layer alignment.
Third single mode optical fiber can be used as light input boot segment, and incident light is allow to effectively enter the first single mode optical fiber.
Based on aforementioned structure, the production method that the present invention further mentions a kind of M-Z fibre optic interferometer temperature sensor, the system
Include: as method
A piece single mode optical fiber is fixed on six axis mobile platforms, the single mode optical fiber is by core layer and is wrapped in core layer
Outer covering composition, the single mode optical fiber have along core layer extending direction there are two core end surface.
Utilize one shrinkage pool of production on femto-second laser wherein a core end surface.
At shrinkage pool set distance use fiber cutter by the single mode optical fiber be divided into the first single mode optical fiber and
Second single mode optical fiber recycles optical fiber splicer, by the first single mode optical fiber and the welding again of the second single mode optical fiber, to melt in segmentation portion
The central point of the core layer of the first single mode optical fiber and the second single mode optical fiber after connecing is misaligned.
Optics coat, the hot light of the optics coat are made using photo-curable glue in the outside of the first single mode optical fiber
Coefficient is greater than the thermo-optical coeffecient of covering, and the refractive index of optics coat is lower than the refractive index of covering.
The above technical solution of the present invention, compared with existing, significant beneficial effect is:
1) one layer of NOA1315 low-index material is coated outside M-Z fiber interference structure, significantly improves its sensitivity,
It can protect the optical fiber of removal coat simultaneously.
2) the M-Z fibre optic interferometer temperature sensor is insensitive to the external refractive index, can effectively solve to survey in temperature
The interference problem of the external refractive index when amount.
3) for M-Z fibre optic interferometer temperature sensor proposed by the present invention convenient for application, production is simple.
It should be appreciated that as long as aforementioned concepts and all combinations additionally conceived described in greater detail below are at this
It can be viewed as a part of the subject matter of the disclosure in the case that the design of sample is not conflicting.In addition, required guarantor
All combinations of the theme of shield are considered as a part of the subject matter of the disclosure.
Can be more fully appreciated from the following description in conjunction with attached drawing present invention teach that the foregoing and other aspects, reality
Apply example and feature.The features and/or benefits of other additional aspects such as illustrative embodiments of the invention will be below
Description in it is obvious, or learnt in practice by the specific embodiment instructed according to the present invention.
Detailed description of the invention
Attached drawing is not intended to drawn to scale.In the accompanying drawings, identical or nearly identical group each of is shown in each figure
It can be indicated by the same numeral at part.For clarity, in each figure, not each component part is labeled.
Now, example will be passed through and the embodiments of various aspects of the invention is described in reference to the drawings, in which:
Fig. 1 is the structural schematic diagram of M-Z fibre optic interferometer temperature sensor of the invention.
Fig. 2 is the working method schematic diagram of M-Z fibre optic interferometer temperature sensor of the invention.
Specific embodiment
In order to better understand the technical content of the present invention, special to lift specific embodiment and institute's accompanying drawings is cooperated to be described as follows.
In conjunction with Fig. 1, the present invention proposes a kind of M-Z fibre optic interferometer temperature sensor, and the M-Z fibre optic interferometer temperature passes
Sensor includes the first single mode optical fiber 10, the second single mode optical fiber 20, optics coat 30.
First single mode optical fiber 10, the second single mode optical fiber 20 by core layer (11,21) and be wrapped in core layer (11,
21) covering (12,22) composition outside.
First single mode optical fiber 10 has first end face and second end face, the second single-mode optics along 11 extending direction of core layer
Fibre 20 has third end face and the 4th end face along 21 extending direction of core layer.
The third end face welding of the second end face of first single mode optical fiber 10 and the second single mode optical fiber 20, and in welding
Place, two core layers (11,21) connect but the two central point is misaligned.
A shrinkage pool 40 is provided in the first end face of first single mode optical fiber 10.
The optics coat 30 is wrapped in the outside of the first single mode optical fiber 10, and two of both ends and the first single mode optical fiber 10
End face is concordant.
The thermo-optical coeffecient of the optics coat 30 is greater than the thermo-optical coeffecient of the covering 12 of the first single mode optical fiber 10, and optics applies
Refractive index of the refractive index of coating 30 lower than the covering 12 of the first single mode optical fiber 10.
The M-Z fibre optic interferometer temperature sensor further includes third single mode optical fiber 50.
The third single mode optical fiber 50 has the 5th end face and the 6th end face along 51 extending direction of core layer.
6th end face of the third single mode optical fiber 50 and the first end face welding of the first single mode optical fiber 10, and weld two
A core layer (51,11) alignment.
Compared with conventional dry interferometer, it is right that the M-Z fibre optic interferometer temperature sensor that the present invention refers to introduces left end micropore
It holds misconstruction and coats one layer of low-refraction optical glue NOA1315 outside structure.Structure left end is existed using femto-second laser
One end of general single mode fiber manufactures a micropore 40, such as general single mode fiber is fixed on six axis mobile platforms using winged
Second laser manufactures one 6 μm of diameter of cylindrical hole in the center of core end surface.Apart from general single mode fiber aperture 40
A flat end face is cut out with fiber cutter at right end 20mm, utilizes optical fiber splicer by this end face and general single mode light again
Two end face center points of fine end welding, this weld deviate 4.5 μm.Finally, by L sections in i.e. Fig. 1 at aperture 40 to dislocation
Coat one layer of low-index material NOA1315.
40 main function of aperture is to destroy waveguiding structure, diffuses to light in covering 12.So at 40 welded joint of aperture,
Input optical signal is divided into two optical path light beams, and partial light transmission to covering 12 is simultaneously propagated as cladding mode, and rest part is protected
It holds and propagates in fiber core 11 and propagated as basic core mode.When the light beam of clad section is propagated by misconstruction
It is coupled back into core mode again.M-Z interference is formed between fibre core and cladding mode there are phase difference.Due to the thermo-optical coeffecient of SiO2
Lower, one layer of low-index material NOA1315 with larger thermo-optical coeffecient of L sections of coatings can effectively improve temperature outside structure
The sensitivity of sensor.
Fig. 2 is the M-Z fibre optic interferometer temperature sensor operation schematic diagram with optics coat 30.Wideband light source 200
(1525~1610nm of wave-length coverage) is connect with fibre optic attenuator 300, and adjusting fibre optic attenuator 300 suitably reduces optical signal energy
Amount, fibre optic attenuator 300 is connect with 100 micropore one end optical fiber of M-Z fibre optic interferometer, 100 other end of M-Z fibre optic interferometer is
Dislocation end is connect with spectrometer 400 (1250~1650nm of spectral region).
Various aspects with reference to the accompanying drawings to describe the present invention in the disclosure, shown in the drawings of the embodiment of many explanations.
Embodiment of the disclosure need not be defined on including all aspects of the invention.It should be appreciated that a variety of designs and reality presented hereinbefore
Those of apply example, and describe in more detail below design and embodiment can in many ways in any one come it is real
It applies, this is because conception and embodiment disclosed in this invention are not limited to any embodiment.In addition, disclosed by the invention one
A little aspects can be used alone, or otherwise any appropriately combined use with disclosed by the invention.
Although the present invention has been disclosed as a preferred embodiment, however, it is not to limit the invention.Skill belonging to the present invention
Has usually intellectual in art field, without departing from the spirit and scope of the present invention, when can be used for a variety of modifications and variations.Cause
This, the scope of protection of the present invention is defined by those of the claims.
Claims (9)
1. a kind of M-Z fibre optic interferometer temperature sensor, which is characterized in that the M-Z fibre optic interferometer temperature sensor includes
First single mode optical fiber, the second single mode optical fiber, optics coat；
First single mode optical fiber, the second single mode optical fiber are made of core layer and the covering being wrapped in outside core layer；
First single mode optical fiber has first end face and second end face along core layer extending direction, and the second single mode optical fiber is along fibre core
Layer extending direction has third end face and the 4th end face；
The second end face of first single mode optical fiber and the third end face welding of the second single mode optical fiber, and in weld, two
Core layer connects but the two central point is misaligned；
A shrinkage pool is provided in the first end face of first single mode optical fiber；
The optics coat is wrapped on the outside of the first single mode optical fiber, and both ends are concordant with two end faces of the first single mode optical fiber；
The thermo-optical coeffecient of the optics coat is greater than the thermo-optical coeffecient of the covering of the first single mode optical fiber, the refraction of optics coat
Refractive index of the rate lower than the covering of the first single mode optical fiber.
2. M-Z fibre optic interferometer temperature sensor according to claim 1, which is characterized in that first single mode optical fiber,
The structure of second single mode optical fiber is identical.
3. M-Z fibre optic interferometer temperature sensor according to claim 1, which is characterized in that the shrinkage pool is in cylindrical type.
4. according to claim 1 or M-Z fibre optic interferometer temperature sensor described in 3, which is characterized in that the shrinkage pool it is straight
Diameter is 6um.
5. M-Z fibre optic interferometer temperature sensor according to claim 1, which is characterized in that first single mode optical fiber,
The core layer central point of second single mode optical fiber is at a distance of 4.5um.
6. M-Z fibre optic interferometer temperature sensor according to claim 1, which is characterized in that the optics coat is adopted
With NOA1315 photo-curable glue.
7. M-Z fibre optic interferometer temperature sensor according to claim 1, which is characterized in that optics coat edge
The length of core layer extending direction is 20mm.
8. M-Z fibre optic interferometer temperature sensor according to claim 1, which is characterized in that the M-Z fibre optic interferometer
Temperature sensor further includes third single mode optical fiber；
The third single mode optical fiber has the 5th end face and the 6th end face along core layer extending direction；The third single mode optical fiber
The first end face welding of 6th end face and the first single mode optical fiber, and two core layer alignment of weld.
9. a kind of production method of M-Z fibre optic interferometer temperature sensor, which is characterized in that the production method includes:
A piece single mode optical fiber is fixed on six axis mobile platforms, the single mode optical fiber is by core layer and is wrapped in outside core layer
Covering composition, the single mode optical fiber have along core layer extending direction there are two core end surface；
Utilize one shrinkage pool of production on femto-second laser wherein a core end surface；
Using fiber cutter that the single mode optical fiber is divided into the first single mode optical fiber and second at shrinkage pool set distance
Single mode optical fiber recycles optical fiber splicer in segmentation portion by the first single mode optical fiber and the welding again of the second single mode optical fiber, after welding
The first single mode optical fiber and the central point of core layer of the second single mode optical fiber be misaligned；
Optics coat, the thermo-optical coeffecient of the optics coat are made using photo-curable glue in the outside of the first single mode optical fiber
Greater than the thermo-optical coeffecient of covering, the refractive index of optics coat is lower than the refractive index of covering.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101650235A (en) * | 2009-09-11 | 2010-02-17 | 重庆大学 | Minitype optical fiber internal integrated optical fiber interference type temperature sensor and manufacturing method thereof |
| CN103344263A (en) * | 2013-06-21 | 2013-10-09 | 华中科技大学 | Interferometric fiber-optical sensor based on core shift structure and manufacturing method thereof |
| CN106959172A (en) * | 2017-03-23 | 2017-07-18 | 重庆大学 | Compact M Z interference temperature sensor of high sensitivity and preparation method thereof |
-
2019
- 2019-02-22 CN CN201910131326.0A patent/CN109813459A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101650235A (en) * | 2009-09-11 | 2010-02-17 | 重庆大学 | Minitype optical fiber internal integrated optical fiber interference type temperature sensor and manufacturing method thereof |
| CN103344263A (en) * | 2013-06-21 | 2013-10-09 | 华中科技大学 | Interferometric fiber-optical sensor based on core shift structure and manufacturing method thereof |
| CN106959172A (en) * | 2017-03-23 | 2017-07-18 | 重庆大学 | Compact M Z interference temperature sensor of high sensitivity and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 张昭: "基于光纤微腔的光纤传感器研究", 《中国优秀硕士学位论文全文数据库 信息科技辑》 * |
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