CN107290076A - A kind of fiber-optical grating temperature sensor of extreme environment multimetering - Google Patents
A kind of fiber-optical grating temperature sensor of extreme environment multimetering Download PDFInfo
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- CN107290076A CN107290076A CN201710572131.0A CN201710572131A CN107290076A CN 107290076 A CN107290076 A CN 107290076A CN 201710572131 A CN201710572131 A CN 201710572131A CN 107290076 A CN107290076 A CN 107290076A
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- fiber
- tube
- inner tube
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
- G01K11/3206—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres at discrete locations in the fibre, e.g. using Bragg scattering
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The invention discloses a kind of fiber-optical grating temperature sensor of extreme environment multimetering, including outer tube and the inner tube being arranged in outer tube, outer tube and inner tube are cylindrical tube, optical fiber is located in inner tube, outer tube and inner tube two ends are rigidly connected by connecting portion, the capillary metal tube that inner tube includes the encapsulation region at middle part and is connected respectively with encapsulation region two ends, wherein optical fiber and capillary metal tube adhesion, grating region and encapsulation region ideal connection.The fiber-optical grating temperature sensor of the present invention to material and structure by being designed, the observable temperature scope of sensor has been obviously improved it and with high sensitivity, the temperature survey effect of the extreme environments such as ultralow temperature, strong-electromagnetic field can be reached, the measurement of simple optical fiber Distributed Multi is also easy to implement very much.
Description
Technical field
The present invention relates to temperature sensor field, specifically a kind of fiber grating temperature of extreme environment multimetering
Spend sensor.
Background technology
Fiber grating is high-precision in nuclear power, superconduction, fusion, Aero-Space, ultralow temperature etc. as a kind of new senser element
Pointed collar domain role is more and more important, in addition substituted traditional resistor sensor trend.Its outstanding electromagnetism interference,
Corrosion-resistant, small volume, loss of signal are small, single fiber multiple spot performance, it is also tackled under the harsh measuring environment of modern industry
Freely.
Traditional electrical measuring method has the defect that can not be overcome under ultralow temperature strong magnetic field circumstance, greatly limit it and uses model
Enclose.In below 20K Kondo effects temp probe resistance can be caused substantially to increase.Under strong-electromagnetic field, Hall effect, magnetoresistance make
Most electronic component readings are obtained to be disturbed strongly.For multimetering under complex working condition, the limitation of electrical measuring method is bigger, often
Individual probe needs to connect 2 or 3 cables, and substantial amounts of cable will undoubtedly have a strong impact on the property of examining system.For example, low temperature is super
During magnetic conductor temperature test, too fat to move cable can take away substantial amounts of heat in liquid helium Dewar, and up to 5T strong magnetic field is led
Electrical measuring method failure is caused, narrow space does not allow the arrangement of a large amount of measure traverse lines yet.In general, as long as with electric current and voltage
As the sensor of signal vehicle, it can be all extremely limited in the environment of ultralow temperature strong-electromagnetic field, or even completely can not
Use.
Fiber grating is that using reflection wavelength as signal vehicle, i.e., wavelength is modulated, and this just completely avoid corresponding electrical measuring method
The drawbacks of bringing.Fiber Bragg Grating FBG is the most frequently used fiber grating, the folding of periodic variation fibre core on ordinary optic fibre
Rate is penetrated, so as to reflect the light of specific wavelength, this set reflection theory can be explained by bragg's formula, so referred to as light
Fine Bragg grating.Refraction index changing spatially minimum repeats yardstick we term it screen periods, between a wavelength
We term it effective refractive index for the mean refractive index of optical fiber.As long as measurand enables to the reflection wavelength of grating to occur
Change, and the wavelength change is separable out, can be used as measurement device using fiber grating.And by grating region
Certain material to the sensitive and dull stroke of respective physical amount is coated or coated, fiber grating can also be used to be surveyed
Amount.
The maximum measurement advantage of fiber grating is that multiple gratings can be carved on simple optical fiber, as long as single grating
Bragg wavelength can be distinguished well, can be carved into the grating of multiple different reflection wavelengths in single fiber in theory,
Using wideband light source, it is possible to achieve tens points on an optical fiber measurement, this brings great convenience to test.
The main component of general optical fiber is silica, and its physical property is mainly undertaken by silica, in ultralow temperature 50K
Its thermal expansion coefficients is very low below, no longer sensitive to temperature, thus bare optical fibers and bare optical gratings below 50K its screen periods with temperature no longer
Change, and its thermo-optical coeffecient also becomes extremely low, and two factors are added up so that naked grating no longer has temperature in below 50K
Sensitiveness, temperature detection failure.So must be added to corresponding ultralow temperature response enhanced sensitivity mechanism, it is set still to have in below 50K
Have temperature sensitivity, here it is under low temperature fiber-optical grating temperature sensor general principle.
General enhanced sensitivity mechanism is all temperature sensitive material (the i.e. thermal coefficient of expansion under low temperature under the cladding low temperature of grating region
Larger material) cause grating region together to expand with heat and contract with cold to realize the change of screen periods with the covering material, pass through demodulator
The drift of wavelength is identified, and then draws corresponding temperature.Temperature-sensitive material as a rule includes under low temperature：Polytetrafluoroethyl-ne
The organic polymers such as alkene, epoxy resin, polyimides, the heat for also having the metal or alloy such as lead, copper, aluminium, wherein organic polymer
The coefficient of expansion is typically 10 times of metal or so.So under low temperature, the photosensitivity-enhancing method coated using enhanced sensitivity material, its enhanced sensitivity limit
It is exactly the thermal expansion limit of respective material, it is impossible to broken through.But for sensor, bigger measurement range and Geng Gao
Susceptibility be the whether outstanding important indicator of sensor performance.
At least there is following defect in currently available technology：
(1) it is only to be realized from the method for cladding enhanced sensitivity material under ultralow temperature on present Method And Principle under ultra-low temperature surroundings
Temperature survey, and the coefficient of thermal expansion of (below 50K) material is very small under ultralow temperature, significantly limit the enhanced sensitivity of this method
Effect.
(2) existing patent is unfavorable for realizing multiple sensor series from a structural point, that is, can not realize list well
Root optical fiber distributed type multimetering, the characteristics of not playing fiber grating well.
The content of the invention
It is an object of the invention to overcome above-mentioned deficiency, there is provided a kind of optical fiber grating temperature of extreme environment multimetering
Sensor, can reach the temperature survey effect of the extreme environments such as ultralow temperature, strong-electromagnetic field, and with high sensitivity.
The object of the present invention is achieved like this：A kind of fiber-optical grating temperature sensor of extreme environment multimetering,
Including outer tube and the inner tube being arranged in outer tube, outer tube and inner tube are cylindrical tube, and optical fiber is located in inner tube, outer tube and inner tube
Two ends are rigidly connected by connecting portion, the capillary metal that inner tube includes the encapsulation region at middle part and is connected respectively with encapsulation region two ends
Pipe, optical fiber and capillary metal tube adhesion, grating region and encapsulation region ideal connection.
It is preferred that, outer tube is the high Teflon tubule material of sensitive property under low temperature, and encapsulation region is polymer, and grating region is ring
Mold is processed oxygen tree fat at normal temperatures.
Further, can connect multiple sensors on simple optical fiber, and multiple sensors are used to measure temperature complicated on optical fiber
Distribution, and the temperature sensor of multiple series connection, can by select different outer tube materials, encapsulation region polymeric material and
Grating region resin material implements processing, realizes the different warm areas of single or several sensors or the synchro measure of required precision.
The advantage of the invention is that：The fiber-optical grating temperature sensor of the present invention uses the dual increasing of cryogenic material and structure
Quick method, has been obviously improved the observable temperature scope of sensor and with high sensitivity, can reach ultralow temperature, strong-electromagnetic field etc.
The temperature survey effect of extreme environment, is also easy to implement the measurement of single fiber Distributed Multi very much.
Brief description of the drawings
Fig. 1 is the structural representation of the fiber-optical grating temperature sensor of the present invention；
Fig. 2 is the structure chart of the section A of the fiber-optical grating temperature sensor of the present invention；
Fig. 3 is the section B of the fiber-optical grating temperature sensor of present invention structure chart；
Fig. 4 is the design sketch of the fiber-optical grating temperature sensor of the present invention；
Wherein, 1- outer tubes；2- connecting portions；31- encapsulation regions；32- capillary metal tubes；4- grating regions, 5- optical fiber.
Embodiment
The present invention is further elaborated below in conjunction with the accompanying drawings.
The present invention is a kind of fiber-optical grating temperature sensor of extreme environment multimetering, as shown in Figure 1, including bag
Outer tube 1 and the inner tube being arranged in outer tube are included, outer tube 1 is Teflon tubule material, and outer tube 1 and inner tube are cylindrical tube, optical fiber 5
In inner tube, outer tube 1 and inner tube two ends are rigidly connected by connecting portion 2, the encapsulation region 31 of inner tube including middle part and with envelope
The capillary metal tube 32 that dress area two ends are connected respectively, optical fiber 5 and the adhesion of capillary metal tube 32, the internal orifice dimension of capillary metal tube 32
Should be as far as possible small under conditions of allowing optical fiber 5 to pass through, grating region 4 and the ideal connection of encapsulation region 31, grating region 4 is on optical fiber 5
The about region of 1cm length, what polymer encapsulated area 31 was encapsulated is the 1cm or so grating region 4, and grating region 4 is coated with low temperature
Material, the cryogenic material is that mold is processed epoxy resin at normal temperatures.
Accompanying drawing 4 is the installation effect figure of this temperature sensor, and multimetering is realized using simple optical fiber multiple spot distributed architecture.
When the temperature sensor in the present embodiment is acted on by temperature change, outer tube and inner tube are experienced in temperature field
Temperature change, because the modulus of elasticity of the polymer of encapsulation region on inner pipe is much smaller than capillary metal tube, so that encapsulation region
Tension and compression rigidity be significantly smaller than the capillary metal tube at its two ends so that total is most of to become when being acted on by temperature load
Shape concentrates on encapsulation region, so that deformation effect of enhanced sensitivity highly significant.
The ratio of structure-sensitized and material effect of enhanced sensitivity is given in the present embodiment：
The ratio between the capillary metal tube of inner tube and thermal coefficient of expansion of encapsulation region polymer are：
The ratio between outer tube polymer and thermal coefficient of expansion of inner tube polymer are：
The ratio between Anti-pull-press rigidity of capillary metal tube of encapsulation region and inner tube is：
The ratio between Anti-pull-press rigidity of encapsulation region and outer tube is：
Finally it should be noted that：Obviously, above-described embodiment is only intended to clearly illustrate the application example, and simultaneously
The non-restriction to embodiment.For those of ordinary skill in the field, it can also do on the basis of the above description
Go out other various forms of changes or variation.There is no necessity and possibility to exhaust all the enbodiments.And thus drawn
Among the obvious changes or variations that Shen goes out is still in the protection domain of the application type.
Claims (7)
1. a kind of fiber-optical grating temperature sensor of extreme environment multimetering, it is characterised in that including outer tube and be arranged at
Inner tube in outer tube, the outer tube and inner tube are cylindrical tube, and optical fiber is located in said inner tube, the outer tube and inner tube two ends
It is rigidly connected by connecting portion, the capillary that said inner tube includes the encapsulation region at middle part and is connected respectively with the encapsulation region two ends
Metal tube, the optical fiber and the capillary metal tube adhesion, the grating region and the encapsulation region ideal connection.
2. a kind of fiber-optical grating temperature sensor of extreme environment multimetering according to claim 1, its feature exists
In the outer tube is polymer.
3. a kind of fiber-optical grating temperature sensor of extreme environment multimetering according to claim 2, its feature exists
In the outer tube is Teflon tubule material.
4. a kind of fiber-optical grating temperature sensor of extreme environment multimetering according to claim 1, its feature exists
In the encapsulation region is polymer.
5. a kind of fiber-optical grating temperature sensor of extreme environment multimetering according to claim 1, its feature exists
In the grating region is coated with cryogenic material, and the cryogenic material is that mold is processed epoxy resin at normal temperatures.
6. a kind of fiber-optical grating temperature sensor of extreme environment multimetering according to claim 3, its feature exists
In the outer tube acts on encapsulation region polymer in inner tube, said inner tube tension and compression rigidity after being deformed by temperature action is less than
Capillary metal tube so that the deformation of inner tube concentrates on grating region, reaches extra effect of enhanced sensitivity.
7. a kind of fiber-optical grating temperature sensor of extreme environment multimetering according to claim any one of 1-6,
Characterized in that, multiple sensors of being connected on the simple optical fiber, multiple sensors are used to measure the optical fiber
Complicated Temperature Distribution.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710572131.0A CN107290076B (en) | 2017-07-13 | 2017-07-13 | Multi-point measuring fiber bragg grating temperature sensor in extreme environment |
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| CN201710572131.0A CN107290076B (en) | 2017-07-13 | 2017-07-13 | Multi-point measuring fiber bragg grating temperature sensor in extreme environment |
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| CN107290076B CN107290076B (en) | 2023-08-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108968182A (en) * | 2018-07-30 | 2018-12-11 | 盐城帝佳妮服饰有限公司 | A kind of high collar jacket of intelligence sleeveless |
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