CN108593137A - A kind of high-precision sensitizing type fiber-optical grating temperature sensor - Google Patents
A kind of high-precision sensitizing type fiber-optical grating temperature sensor Download PDFInfo
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- CN108593137A CN108593137A CN201810556397.0A CN201810556397A CN108593137A CN 108593137 A CN108593137 A CN 108593137A CN 201810556397 A CN201810556397 A CN 201810556397A CN 108593137 A CN108593137 A CN 108593137A
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- inner core
- cylinder
- fiber
- outer protection
- precision
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- 230000001235 sensitizing effect Effects 0.000 title claims abstract description 14
- 239000000835 fiber Substances 0.000 claims abstract description 31
- 239000013307 optical fiber Substances 0.000 claims abstract description 8
- 239000003292 glue Substances 0.000 claims abstract description 7
- 239000007769 metal material Substances 0.000 claims abstract description 3
- 230000003287 optical effect Effects 0.000 claims description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 239000010949 copper Substances 0.000 claims description 6
- 229910000838 Al alloy Inorganic materials 0.000 claims description 2
- 239000000956 alloy Substances 0.000 claims description 2
- 230000001681 protective effect Effects 0.000 claims description 2
- 230000006978 adaptation Effects 0.000 claims 1
- 238000009434 installation Methods 0.000 abstract description 2
- 230000035945 sensitivity Effects 0.000 description 16
- 210000002105 tongue Anatomy 0.000 description 10
- 239000000463 material Substances 0.000 description 9
- 238000005259 measurement Methods 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000009529 body temperature measurement Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 241000784732 Lycaena phlaeas Species 0.000 description 1
- 206010034972 Photosensitivity reaction Diseases 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003500 flue dust Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 210000003739 neck Anatomy 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
Classifications
-
- 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
Abstract
The invention discloses a kind of high-precision sensitizing type fiber-optical grating temperature sensor, including fiber grating, inner core and outer protection cylinder, inner core is in strip, is higher than 15 × 10 using coefficient of thermal expansion‑6The metal material of/K is made; inner core is equipped with the strip anchor slot of optical fibre grating; outer protection cylinder includes the hold-doun nut of cylinder and cylinder both ends; hold-doun nut is connected through a screw thread mounted on cylinder both ends; hold-doun nut is equipped with the through-hole passed through for fiber grating; the size of anchor slot and the size gap of fiber grating coordinate, and fiber grating glue is fixed in the anchor slot of inner core, and inner core is placed in outer protection cylinder.Sensor of the invention is small, exquisite appearance, makes and easy for installation, and stability and durability are good, low to execution conditions requirement, can the extensive use in Practical Project.
Description
Technical field
The present invention relates to the inspections of the civil engineerings such as building, bridge, tunnel and road（Prison）Survey technology field, it is specifically a kind of
High-precision sensitizing type fiber-optical grating temperature sensor.
Background technology
Currently, the common non-electrical class thermometer of field of temperature measurement is mercurial thermometer, its advantage is that measurement result is stablized, but essence
It spends relatively low, data cannot be automatically recorded, application limitation is larger；Temperature element is not required to contact with measured medium when infrared measurement of temperature,
Temperature-measuring range is wide, is not limited by the thermometric upper limit, and the temperature field of testee will not be destroyed, and reaction speed generally also compares
Soon, but by extraneous factors such as the emissivity of object, measurement distance, flue dust and aqueous vapors it is influenced, measurement error is larger；Electric class
Temperature sensor using flexible, it is convenient to measure, and commercial Application is more, and wherein thermocouple sensor temperature-measuring range is wide, and response is fast, lacks
Point is that precision is low, is easy to be influenced by environmental disturbances signal, and Rig up error easily causes large error；Copper resistance sensor
Low energy consumption, stablizes, but copper, which is more than 150 DEG C, is easy oxidation, causes its temperature-measuring range limited；Platinum sensor precision is high, surely
The qualitative and linearity is good, but its higher resistance change rate of temperature is smaller, causes precision lower and lower；In addition, electrical sensor
The shortcomings that generally existing, also has：Higher price, long-time stability are poor, can not achieve distribution multimetering and remote transmission.
Fiber-optical grating temperature sensor has light weight, small, electromagnetism interference energy compared with conventional temperature sensor
Power is strong, anticorrosive, high pressure resistant, signal decaying is small, collection sensing is transmitted in the advantages that integrated with information.Wherein fiber bragg grating
(FBG) temperature sensor is not influenced and electromagnetic interference with its measuring signal by light source fluctuating, can conveniently realize distributed survey
Amount and easily embedment measure material internal and carry out high-resolution and the measurement of large-scale temperature, in view of these advantages FBG fiber optic temperatures
Sensing technology has a wide range of applications in field of temperature measurement, can solve the problems, such as that conventional detection technology is difficult to competent measurement.
The intrinsic temperature resolution of fiber grating is 0.1 DEG C/pm, this is higher to temperature control and required precision at some
Occasion under be unable to meet demand, therefore high precision int sensitized reaction is carried out to sensor.Initial enhanced sensitivity technology is by FBG
It is affixed directly to the enterprising trip temperature enhanced sensitivity of material of the big coefficient of expansion, some current photosensitivity-enhancing methods include mainly that metal tube increases
Quick, polymer enhanced sensitivity and bimetallic enhanced sensitivity etc..Polymer encapsulated high sensitivity, but hesitation is larger, and bimetallic enhanced sensitivity is led
Sensor appearance and size is caused to become larger, temperature-responsive speed is slow, and sensor firmness and use durability degree are relatively low.And with gold
The arrangement of temperature sensor for belonging to tubular type sensitized reaction is simple, and high sensitivity is favored by numerous researchers.But currently on the market
The problems such as that there are stability is poor for most metals tubular type temperature sensor, and useful life longevity is poor in harsh environment.
Invention content
The purpose of the present invention is the deficiencies in for the above-mentioned prior art, provide a kind of high-precision sensitizing type fiber grating temperature
Spend sensor.
The purpose of the present invention is what is be achieved through the following technical solutions：
A kind of high-precision sensitizing type fiber-optical grating temperature sensor, which is characterized in that including fiber grating, inner core and outer protection
Cylinder, the inner core are in strip, are more than 15 × 10 using coefficient of thermal expansion-6The metal material of/K is made, and inner core is equipped with accommodating
The strip anchor slot of the fiber grating, the outer protection cylinder include the hold-doun nut of cylinder and cylinder both ends, the fixation
Nut is connected through a screw thread mounted on cylinder both ends, and hold-doun nut is equipped with the through-hole passed through for the fiber grating, the anchor
Gu the size of slot and the size gap of the fiber grating coordinate, the fiber grating glue is fixed in the anchor slot of the inner core,
The inner core is placed in the outer protection cylinder.
In the further design scheme of the present invention, the inner wall in above-mentioned outer protection cylinder cylinder is equipped with a tongue, described
Inner core bottom is equipped with size groove compatible with the tongue, and the inner core is pacified by the cooperation of the tongue and groove
Dress is fixed in the outer protection cylinder cylinder.
In the further design scheme of the present invention, the thin plastic flexible pipe and armour for being arranged with protective effect of above-mentioned fiber grating
Optical cable is filled, is fixed in the groove of inner core with glue by thin plastic flexible pipe and optical cable.
In the further design scheme of the present invention, above-mentioned inner core uses aluminum alloy materials or metallic copper.
In the further design scheme of the present invention, above-mentioned inner core is semicylinder, the diameter of inner core and the outer protection cylinder
The internal diameter of cylinder matches.
The inner core of the temperature sensor of the present invention is made of the metal of high thermal expansion coefficient（Such as common copper, aluminium）,
The variation of measurand temperature causes the variation of length of inner core first.Grating is combined closely with inner core by high-performance glue, phase
0 is essentially to slippage, when temperature change, expanding with heat and contract with cold for grating will change with the variation of inner core.And the heat of optical fiber is swollen
Material is much smaller used in swollen index contrast inner core, therefore the temperature sensor of the present invention and ordinary optic fibre grating temperature sensor
Compared to sensitivity higher, and temperature sensitive coefficient can be changed by changing the material of inner core.In addition, inner core and outer protection cylinder
Between opposite sliding, effectively eliminate the stress influence that grating may be subject to, the variation of centre wavelength is only affected by temperature,
Measurement accuracy higher.
The present invention has advantageous effect following prominent：
The temperature sensor of the present invention is improved on the basis of ordinary optic fibre grating temperature sensor, improves measurement spirit
Sensitivity and precision；And sensitivity can be changed by changing the material of inner core, flexibility ratio is high, disclosure satisfy that different necks
Application in domain.Sensor of the invention is small, exquisite appearance, makes and easy for installation, stability and durability are good, right
Execution conditions requirement is low, can the extensive use in Practical Project.
Description of the drawings
Fig. 1 is high-precision sensitizing type fiber-optical grating temperature sensor structural schematic diagram in embodiment；
Fig. 2 is embodiment China and foreign countries protection barrel structure schematic diagram；
Fig. 3 is hold-doun nut structural schematic diagram in embodiment；
Fig. 4 is model core arrangement schematic diagram in embodiment；
Fig. 5 is inner core front view in embodiment；
Fig. 6 is experimental test result figure.
In figure, 1- outer protection cylinders, 2- outer protection cylinder cylinders, 3- tongues, 4- hold-doun nuts, 5- internal threads, 6- through-holes, in 7-
Core, the thin anchor slots of 8-, the thick anchor slots of 9-, 10- grooves, 11- fiber gratings, 12- armored optical cables, 13- tail grid.
Specific implementation mode
The invention will be further described with reference to the accompanying drawings and embodiments.
Referring to Fig. 1~Fig. 6, a kind of high-precision sensitizing type fiber-optical grating temperature sensor in the present invention, including optical fiber light
Grid 11, inner core 7 and outer protection cylinder 1, inner core 7 are in strip, and inner core 7 uses metallic copper.Inner core 7 be semicylinder, inner core 7 it is straight
Diameter is matched with the internal diameter of outer protection cylinder cylinder 2 so that inner core 7 can be easy to be packed into outer protection cylinder cylinder 2.On inner core 7
Strip anchor slot equipped with optical fibre grating 11, outer protection cylinder 1 include the hold-doun nut 4 of cylinder and cylinder both ends, fixed
Nut 4 is connected through a screw thread mounted on cylinder both ends, and hold-doun nut 4 is equipped with the through-hole 6 passed through for fiber grating 11, through-hole 6
Diameter it is identical as optic cable diameter；It is carved with external screw thread, size and length and matches with 1 internal thread 5 of outer protection cylinder in 4 end of hold-doun nut
It closes, in order to keep sensor overall beautiful, hold-doun nut 4 is round table-like.It is circular through hole 6, diameter and optic cable diameter among nut
It is identical.The size of anchor slot coordinates with the size gap of fiber grating 11, and 11 glue of fiber grating is fixed in the anchor slot of inner core 7,
Inner core 7 is placed in outer protection cylinder 1.Inner wall in outer protection cylinder cylinder 2 is equipped with a tongue 3,3 section of tongue be it is semicircle or
Person's triangle, tongue 3 are used for fixing inner core 7.7 bottom of inner core is equipped with size groove 10 compatible with tongue 3, inner core 7
It is mounted in outer protection cylinder cylinder 2 by the cooperation of tongue 3 and groove 10.The tail grid 13 of fiber grating 11 are arranged with protection
The thin plastic flexible pipe and armored optical cable 12 of effect.
Since 11 part of fiber grating does not have protective layer, diameter smaller than the diameter of optical cable 12, in order to preferably be fixed on
In the anchor slot of inner core 7, the fixing groove of inner core 7 is designed to include the thin anchor slot 8 at middle part and the thick anchor slot 9 at both ends, ruler
Very little small thin anchor slot 8 is used for accommodating fixed fiber grating 11, and the big thick anchor slot 9 of size is for accommodating fixed optical cable.
The making step of the long gauge length strain transducer of high-precision sensitizing type is：
Inner core 7 is placed on making platform by step 1, is adjusted good position, is fixed.
Fiber grating 11 is fixed on making platform by step 2, so that grating is in the centre position of 7 anchor slot of inner core, and right
Optical fiber carries out a degree of tensioning, then starts to carry out gluing into the thin anchor slot 8 of inner core 7, fiber grating 11 is fixed
In in thin anchor slot 8.
Step 3, after the adhesive curing in step 2, be arranged protection optical cable in both ends tail optical fiber part respectively, end of cable is placed on
In the thick anchor slot 9 of inner core 7, then optical cable is fixed in thick anchor slot 9 with glue.
Step 4, after the adhesive curing in step 3, the groove 10 inner core 7 is corresponding with the tongue 3 of outer protection cylinder 1, will in
Core 7 imports outer protection cylinder 1,
Hold-doun nut 4 is screwed into outer protection cylinder 1 by step 5, and optical cable is pierced by from circular through hole 6.
When being measured to temperature, sensor can be pasted onto to body structure surface to be measured, can also be built-in or embedded,
It is more sensitive to temperature change due to the material that inner core 7 is high thermal expansion coefficient, therefore temperature sensor greatly improves survey
Measure sensitivity and precision.Its sensitivity can be adjusted by changing the material of inner core 7.
In order to verify sensitivity and the stability of inventive sensor, staking-out work is carried out to it in laboratory, chooses 1
A ordinary temp sensor is compared with 3 temperature sensors of the present invention, 7 material of inner core of selected inventive sensor
For copper, inner core 7 diameter 5mm, length 60mm, anchoring slot length 40mm.
Sensor often increases 5 DEG C, and wavelength increases 50 pm, then sensitivity coefficient is 0.1 DEG C/pm.Experimental result such as Fig. 6 institutes
Show, the sensitivity coefficient of ordinary optic fibre grating temperature sensor is 0.1 DEG C/pm, and sensor of the invention temperature sensitive coefficient is
It 0.2 DEG C/pm, is increased to twice, and the material by changing inner core 7 can obtain different sensitivity coefficients, it is very big to improve
Using flexible and precision, it is easy to utilize.
The above are preferred embodiments of the present invention, all any changes made according to the technical solution of the present invention, and generated function is made
When with range without departing from technical solution of the present invention, all belong to the scope of protection of the present invention.
Claims (5)
1. a kind of high-precision sensitizing type fiber-optical grating temperature sensor, which is characterized in that including fiber grating（11）, inner core（7）
And outer protection cylinder（1）, the inner core（7）In strip, it is more than 15 × 10 using coefficient of thermal expansion-6The metal material of/K is made,
Inner core（7）It is equipped with and houses the fiber grating（11）Strip anchor slot, the outer protection cylinder（1）Including cylinder and cylinder
The hold-doun nut at both ends（4）, the hold-doun nut（4）It is connected through a screw thread and is mounted on cylinder both ends, hold-doun nut（4）It is equipped with
For the fiber grating（11）The through-hole passed through（6）, the size of the anchor slot and the fiber grating（11）Size gap
Cooperation, the fiber grating（11）Glue is fixed in the inner core（7）Anchor slot in, the inner core（7）It is placed in the outer protection cylinder
（1）It is interior.
2. high-precision sensitizing type fiber-optical grating temperature sensor according to claim 1, which is characterized in that the outer protection
Cylinder cylinder（2）Interior inner wall is equipped with a tongue（3）, the inner core（7）Bottom is equipped with a size and the tongue（3）Phase
The groove of adaptation（10）, the inner core（7）Pass through the tongue（3）And groove（10）Cooperation be mounted on the outer protection
Cylinder cylinder（2）It is interior.
3. high-precision sensitizing type fiber-optical grating temperature sensor according to claim 1, which is characterized in that the optical fiber light
Grid（11）Tail optical fiber（13）It is arranged with the thin plastic flexible pipe and armored optical cable of protective effect（12）.
4. high-precision sensitizing type fiber-optical grating temperature sensor according to claim 1, which is characterized in that the inner core
（7）Using aluminum alloy materials or metallic copper.
5. high-precision sensitizing type fiber-optical grating temperature sensor according to claim 1, which is characterized in that the inner core
（7）For semicylinder, inner core（7）Diameter and the outer protection cylinder cylinder（2）Internal diameter match.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810556397.0A CN108593137A (en) | 2018-06-01 | 2018-06-01 | A kind of high-precision sensitizing type fiber-optical grating temperature sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810556397.0A CN108593137A (en) | 2018-06-01 | 2018-06-01 | A kind of high-precision sensitizing type fiber-optical grating temperature sensor |
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| Publication Number | Publication Date |
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| CN108593137A true CN108593137A (en) | 2018-09-28 |
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|---|---|---|---|
| CN201810556397.0A Pending CN108593137A (en) | 2018-06-01 | 2018-06-01 | A kind of high-precision sensitizing type fiber-optical grating temperature sensor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110440839A (en) * | 2019-08-11 | 2019-11-12 | 蚌埠学院 | A kind of pre- daraf(reciprocal of farad) of fiber-optic grating sensor prepackage armored optical cable set |
| CN112113681A (en) * | 2020-09-14 | 2020-12-22 | 重庆泰山电缆有限公司 | Temperature sensing structure and temperature detection method for high-voltage cable repair part |
| CN113125040A (en) * | 2021-04-12 | 2021-07-16 | 武汉理工大学 | Anti-interference super-response FBG thermometer and measuring method thereof |
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| CN208187584U (en) * | 2018-06-01 | 2018-12-04 | 南京梦联桥传感科技有限公司 | A kind of high-precision sensitizing type fiber grating temperature sensor |
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2018
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Patent Citations (6)
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| CN1563916A (en) * | 2004-03-19 | 2005-01-12 | 天津大学 | Optical raster temp senser and its mfg. method |
| CN101738269A (en) * | 2009-11-13 | 2010-06-16 | 韩红远 | Method for encapsulating optical fiber Bragg grating temperature sensor |
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| CN110440839A (en) * | 2019-08-11 | 2019-11-12 | 蚌埠学院 | A kind of pre- daraf(reciprocal of farad) of fiber-optic grating sensor prepackage armored optical cable set |
| CN112113681A (en) * | 2020-09-14 | 2020-12-22 | 重庆泰山电缆有限公司 | Temperature sensing structure and temperature detection method for high-voltage cable repair part |
| CN113125040A (en) * | 2021-04-12 | 2021-07-16 | 武汉理工大学 | Anti-interference super-response FBG thermometer and measuring method thereof |
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Inventor after: Yang Caiqian Inventor after: Yang Jing Inventor after: Pan Yong Inventor after: Chen Shanshan Inventor after: Zhu Fawang Inventor after: Yang Xiaocong Inventor after: Huang Shubo Inventor before: Yang Caiqian Inventor before: Pan Yong Inventor before: Yang Jing Inventor before: Chen Shanshan Inventor before: Zhu Fawang Inventor before: Yang Xiaocong Inventor before: Huang Shubo |
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Address after: 210019 room 1003, building 05, No.18, Jiangdong Street, Jialing, Jianye District, Nanjing City, Jiangsu Province Applicant after: Jiangsu menglianqiao Technology Co.,Ltd. Address before: 210019 room 204-50, 2 / F, building 04, No.18, Jiangdong Street, Jialing, Jianye District, Nanjing City, Jiangsu Province Applicant before: NANJING MENGLIANQIAO SENSING TECHNOLOGY Co.,Ltd. |
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