CN208187584U - A kind of high-precision sensitizing type fiber grating temperature sensor - Google Patents
A kind of high-precision sensitizing type fiber grating temperature sensor Download PDFInfo
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- CN208187584U CN208187584U CN201820843553.7U CN201820843553U CN208187584U CN 208187584 U CN208187584 U CN 208187584U CN 201820843553 U CN201820843553 U CN 201820843553U CN 208187584 U CN208187584 U CN 208187584U
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Abstract
The utility model discloses a kind of high-precision sensitizing type fiber grating temperature sensors, including fiber grating, inner core and outer protection cylinder, and inner core is in long strip, are higher than 15 × 10 using thermal expansion coefficient‑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, which is connected through a screw thread, is 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 cooperate, and fiber grating glue is fixed in the anchor slot of inner core, and inner core is placed in outer protection cylinder.The sensor bulk of the utility model is small, exquisite appearance, makes and easy for installation, and stability and durability are good, low to execution conditions requirement, can be widely applied in practical projects.
Description
Technical field
The utility model relates to build, the civil engineerings such as bridge, tunnel and road examine (prison) survey technology field, specifically
A kind of high-precision sensitizing type fiber grating temperature sensor.
Background technique
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 lower, 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
Fastly, 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, measurement is convenient, and industrial 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 is more than 150 DEG C easy to oxidize, 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
Generally existing disadvantage is also: price is higher, and long-time stability are poor, can not achieve distribution multimetering and remote transmission.
Fiber grating temperature sensor has light weight, small in size, electromagnetism interference energy compared with conventional temperature sensor
Power is strong, anticorrosive, high pressure resistant, signal decaying is small, collection sensing and information are transmitted in the advantages that integrated.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 temperature
Sensing technology has a wide range of applications in field of temperature measurement, is able to solve conventional detection technology and is difficult to competent measurement problem.
The intrinsic temperature resolution of fiber grating is 0.1 DEG C/pm, this is higher in some pairs of temperature sensitivities and required precision
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, current some photosensitivity-enhancing methods mainly include 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 outer dimension is caused to become larger, temperature-responsive speed is slow, and sensor firmness and use durability degree are lower.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.
Summary of the invention
The purpose of this utility model is in view of the deficiency of the prior art, to provide a kind of high-precision sensitizing type optical fiber light
Grid temperature sensor.
The purpose of this utility model is achieved through the following technical solutions:
A kind of high-precision sensitizing type fiber grating temperature sensor, which is characterized in that including fiber grating, inner core and outer guarantor
Casing, the inner core is in long strip, is greater than 15 × 10 using thermal expansion coefficient-6The metal material of/K is made, and inner core, which is equipped with, to be held
The strip anchor slot of the fiber grating is set, the outer protection cylinder includes the hold-doun nut of cylinder and cylinder both ends, described solid
Determine nut and be connected through a screw thread to be mounted on cylinder both ends, hold-doun nut is equipped with the through-hole passed through for the fiber grating, described
The size of anchor slot and the size gap of the fiber grating cooperate, and the fiber grating glue is fixed in the anchor slot of the inner core
Interior, the inner core is placed in the outer protection cylinder.
In the further design scheme of the utility model, the above-mentioned intracorporal inner wall of outer protection cylinder cylinder is equipped with a tongue,
The inner core bottom is equipped with size groove compatible with the tongue, and the inner core passes through matching for the tongue and groove
Conjunction is mounted in the outer protection cylinder cylinder.
In the further design scheme of the utility model, the thin plastic flexible pipe for being arranged with protective effect of above-mentioned fiber grating
And armored optical cable, it is fixed in the groove of inner core by thin plastic flexible pipe and optical cable with glue.
In the further design scheme of the utility model, above-mentioned inner core uses aluminum alloy materials or metallic copper.
In the further design scheme of the utility model, above-mentioned inner core is semicylinder, the diameter of inner core and the outer guarantor
The internal diameter of casing cylinder matches.
(such as common copper, aluminium is made using the metal of high thermal expansion coefficient in the inner core of the temperature sensor of the utility model
Deng), 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,
Its relative slippage is essentially 0, and when temperature change, expanding with heat and contract with cold for grating will change with the variation of inner core.And optical fiber
Material used in thermal expansion coefficient comparison inner core is much smaller, therefore the temperature sensor of the utility model and ordinary optic fibre grating temperature
It is higher compared to sensitivity to spend sensor, and temperature sensitive coefficient can change by changing the material of inner core.In addition, inner core with
Opposite sliding between outer protection cylinder, effectively eliminates the stress influence that grating may be subject to, the variation of central wavelength only by
Temperature influences, and measurement accuracy is higher.
The utility model have it is following prominent the utility model has the advantages that
The temperature sensor of the utility model is improved on the basis of ordinary optic fibre grating temperature sensor, is improved
Measurement sensitivity and precision；And sensitivity can be changed by changing the material of inner core, flexibility ratio is high, Neng Gouman
Application in sufficient different field.The sensor bulk of the utility model is small, exquisite appearance, production and easy for installation, stability
And durability is good, and it is low to execution conditions requirement, it can be widely applied in practical projects.
Detailed description of the invention
Fig. 1 is high-precision sensitizing type fiber 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 main view in embodiment；
Fig. 6 is experimental test result figure；
In figure, 1- outer protection cylinder, 2- outer protection cylinder cylinder, 3- tongue, 4- hold-doun nut, 5- internal screw thread, 6- through-hole, in 7-
Core, the thin anchor slot of 8-, the thick anchor slot of 9-, 10- groove, 11- fiber grating, 12- armored optical cable, 13- tail grid.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawings and embodiments.
Referring to FIG. 1 to FIG. 6, one of the utility model high-precision sensitizing type fiber grating temperature sensor, including light
Fine grating 11, inner core 7 and outer protection cylinder 1, inner core 7 is in long strip, and inner core 7 uses metallic copper.Inner core 7 is semicylinder, inner core 7
Diameter matched with the internal diameter of outer protection cylinder cylinder 2, enable inner core 7 be easy to be packed into outer protection cylinder cylinder 2 in.Inner core
7 are equipped with the strip anchor slot of optical fibre grating 11, and outer protection cylinder 1 includes the hold-doun nut 4 of cylinder and cylinder both ends, Gu
Determine nut 4 and be connected through a screw thread to be mounted on cylinder both ends, hold-doun nut 4 is equipped with the through-hole 6 passed through for fiber grating 11, through-hole
6 diameter is identical as optic cable diameter；It is carved with external screw thread, size and length and 1 internal screw thread of outer protection cylinder, 5 phase in 4 end of hold-doun nut
Cooperation, in order to keep sensor overall beautiful, hold-doun nut 4 is round table-like.It is circular through hole 6 among nut, diameter is straight with optical cable
Diameter is identical.The size of anchor slot and the size gap of fiber grating 11 cooperate, and 11 glue of fiber grating is fixed in the anchor slot of inner core 7
Interior, inner core 7 is placed in outer protection cylinder 1.Inner wall in outer protection cylinder cylinder 2 is equipped with a tongue 3, and 3 section of tongue is semicircle
Shape or triangle, tongue 3 are used to fix inner core 7.7 bottom of inner core is equipped with size groove 10 compatible with tongue 3, interior
Core 7 is fixed in outer protection cylinder cylinder 2 by tongue 3 and being coupled for groove 10.The tail grid 13 of fiber grating 11 are arranged with
The thin plastic flexible pipe and armored optical cable 12 of protective effect.
Since 11 part of fiber grating does not have protective layer, diameter is 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 to accommodate 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 are as follows:
Inner core 7 is placed on production platform by step 1, is adjusted good position, is fixed.
Fiber grating 11 is fixed on production platform by step 2, so that grating is in the middle 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, and 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 of inner core 7 and the tongue 3 of outer protection cylinder 1 is corresponding, 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 measuring to temperature, sensor can be pasted onto body structure surface to be measured, can also built-in or insertion,
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 the sensitivity and stability of the utility model sensor, staking-out work is carried out to it in laboratory,
It chooses 1 ordinary temp sensor to compare with 3 the utility model temperature sensors, selected the utility model sensing
7 material of inner core of device is copper, and inner core 7 diameter 5mm, length 60mm anchor slot length 40mm.
Sensor is every to increase 5 DEG C, and wavelength increases 50 pm, then sensitivity coefficient is 0.1 DEG C/pm.Experimental result such as Fig. 6 institute
Show, the sensitivity coefficient of ordinary optic fibre grating temperature sensor is 0.1 DEG C/pm, the sensitive system of the sensor temperature of the utility model
Number is 0.2 DEG C/pm, is increased to twice, and can obtain different sensitivity coefficients by the material of change inner core 7, very big
Using flexible and precision are improved, it is easy to promote and utilize.
It is the preferred embodiment of the utility model above, it is all to change according to made by technical solutions of the utility model, it is produced
Function without departing from technical solutions of the utility model range when, belong to the protection scope of the utility model.
Claims (5)
1. a kind of high-precision sensitizing type fiber grating temperature sensor, which is characterized in that including fiber grating (11), inner core (7)
With outer protection cylinder (1), the inner core (7) is in long strip, is greater than 15 × 10 using thermal expansion coefficient-6The metal material of/K is made,
Inner core (7) is equipped with the strip anchor slot for accommodating the fiber grating (11), and the outer protection cylinder (1) includes cylinder and cylinder
The hold-doun nut (4) at both ends, the hold-doun nut (4), which is connected through a screw thread, is mounted on cylinder both ends, and hold-doun nut (4) is equipped with
For the through-hole (6) that the fiber grating (11) passes through, the size gap of the size of the anchor slot and the fiber grating (11)
Cooperation, fiber grating (11) glue are fixed in the anchor slot of the inner core (7), and the inner core (7) is placed in the outer protection cylinder
(1) in.
2. high-precision sensitizing type fiber grating temperature sensor according to claim 1, which is characterized in that the outer protection
Inner wall in cylinder cylinder (2) is equipped with a tongue (3), and inner core (7) bottom is equipped with a size and the tongue (3) phase
The groove (10) of adaptation, the inner core (7) are fixed on the outer protection by the tongue (3) and being coupled for groove (10)
In cylinder cylinder (2).
3. high-precision sensitizing type fiber grating temperature sensor according to claim 1, which is characterized in that the optical fiber light
The tail optical fiber (13) of grid (11) is arranged with the thin plastic flexible pipe and armored optical cable (12) of protective effect.
4. high-precision sensitizing type fiber grating temperature sensor according to claim 1, which is characterized in that the inner core
(7) aluminum alloy materials or metallic copper are used.
5. high-precision sensitizing type fiber grating temperature sensor according to claim 1, which is characterized in that the inner core
It (7) is semicylinder, the diameter of inner core (7) is matched with the internal diameter of the outer protection cylinder cylinder (2).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820843553.7U CN208187584U (en) | 2018-06-01 | 2018-06-01 | A kind of high-precision sensitizing type fiber grating temperature sensor |
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| CN201820843553.7U CN208187584U (en) | 2018-06-01 | 2018-06-01 | A kind of high-precision sensitizing type fiber grating temperature sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108593137A (en) * | 2018-06-01 | 2018-09-28 | 南京梦联桥传感科技有限公司 | A kind of high-precision sensitizing type fiber-optical grating temperature sensor |
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2018
- 2018-06-01 CN CN201820843553.7U patent/CN208187584U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108593137A (en) * | 2018-06-01 | 2018-09-28 | 南京梦联桥传感科技有限公司 | A kind of high-precision sensitizing type fiber-optical grating temperature sensor |
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Address after: 210019 room 1003, building 05, No.18, Jiangdong Street, Jialing, Jianye District, Nanjing City, Jiangsu Province Patentee 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 Patentee before: NANJING MENGLIANQIAO SENSING TECHNOLOGY Co.,Ltd. |