CN202757707U - Rapid response high sensitivity fiber grating temperature sensor - Google Patents
Rapid response high sensitivity fiber grating temperature sensor Download PDFInfo
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- CN202757707U CN202757707U CN201220430756.6U CN201220430756U CN202757707U CN 202757707 U CN202757707 U CN 202757707U CN 201220430756 U CN201220430756 U CN 201220430756U CN 202757707 U CN202757707 U CN 202757707U
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- fiber grating
- temperature sensor
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Abstract
The utility model relates to a rapid response high sensitivity fiber grating temperature sensor, which is characterized in that a metal tube seals a fiber grating, and tail fibers at two ends of the fiber grating is sleeved with a fiber sheath with a certain length for protecting. The rapid response high sensitivity fiber grating temperature sensor has the beneficial effect that the temperature sensitivity can reach as high as 30pm/DEG C which is 3 times of that of the fiber grating temperature sensor. On this base, the resolution of the rapid response high sensitivity fiber grating temperature sensor can reach 0.03 DEG C, and the temperature response time is fast, the response time is less than 300ms, and the temperature measurement efficiency is substantially enhanced. In addition, the fiber grating sensor embodies the advantages of inherent anti-electromagnetic interference, adjustable wavelength, small volume and light weight, the probe type temperature sensing can be realized, and the rapid response high sensitivity fiber grating temperature sensor has wide application prospect in the water temperature measure field.
Description
Technical field
The utility model relates to fiber grating sensing technology, especially a kind of quick response high-sensitivity optical fibre grating temperature sensor.
Background technology
Fiber grating has been emerging a kind of basic fiber optic passive device in the world since the nineties in 20th century.Fiber-optical grating temperature sensor has been inherited outside the advantages such as anti-electromagnetic interference (EMI), the volume of fiber grating be little, lightweight, also have can bury, the life-span is long, reusability good, can form the characteristics such as quasi-distributed sensor network.Therefore, fiber-optical grating temperature sensor is widely used in the engineering fields such as dam, bridge, tunnel, mine.
The simplest also is that modal fiber-optical grating temperature sensor is to be packaged in metal tube in free state naked grating or on the metal patch.The temperature sensor of encapsulation has good repeatability and stable like this, but because grating is in complete free state, the raster center wave length shift that variation of ambient temperature causes is only caused by thermal sensitive effect and the thermo-optic effect of grating itself.Therefore temperature control is only had an appointment 10pm/ ℃, even adopt at present preferably demodulated equipment, also can only reach 0.1 ℃ temperature resolution, can not satisfy the actual measurement requirement far away.On the other hand, the temperature sensor of Metal Packaging is generally selected thicker diameter, thereby has been affected its thermal conduction rate in order to guarantee the free bent state of grating, has prolonged the response time of sensor, need can't be applied to the occasion of fast temperature response.
Summary of the invention
The utility model will solve the shortcoming of above-mentioned prior art, provides a kind of volume little, lightweight quick response high-sensitivity optical fibre grating temperature sensor.
The utility model solves the technical scheme that its technical matters adopts: this quick response high-sensitivity optical fibre grating temperature sensor; it is characterized in that it by fiber grating of a metal tube encapsulation, the optical fiber jacket of certain-length is protected on the two ends Pigtail sleeve of fiber grating.
As preferably, described metal tube adopts brass, aluminium or stainless steel material, and its length is 30mm, and external diameter is 1.5mm, and internal diameter is 0.9mm.
As preferably, described fiber grating is bragg grating, and grid region length is 12 ~ 15mm, and reflectivity is not less than 80%, and two ends tail optical fiber length is not less than 1m.
As preferably, described optical fiber jacket external diameter is 0.9mm, and internal diameter is 0.4mm, and length is not less than 30cm.
As preferably, to fix by the mode of gluing or laser bonding between the tail optical fiber of described metal tube and fiber grating, fiber grating is located at the place, axle center of metal tube, and both center-aligned.
As preferably, described fiber grating is a certain size pretension in addition, and the fiber bragg grating center wavelength drift value that produces is about 2nm.
As preferably, fix by gluing mode between the tail optical fiber of described optical fiber jacket and metal tube, fiber grating.
As preferably, described metal tube two ends seal with glue, and the fiber grating grid region is in the airtight air chamber.
As package casing, a fiber grating with pretension is fixed in the place, axle center of metal tube to the utility model with metal tube with larger thermal expansivity, and the optical fiber jacket at metal tube two ends is protected the tail optical fiber of fiber grating.Its ultimate principle is that when ambient temperature changed, metal tube can produce and expand with heat and contract with cold.Because fiber grating is in tensioned state all the time, thus the stretching of metal tube or shrink stretching or the contraction that can drive real-time fiber grating, cause the drift of fiber bragg grating center wavelength, realize temperature sensitizing.Thermal sensitive effect and thermo-optic effect in conjunction with grating itself had both reached the requirement of temperature fast response, had realized again the target of high sensitivity thermometric.
The effect that utility model is useful is: 30pm/ ℃ of its temperature control Gao Keda is 3 times of ordinary optic fibre grating temperature sensor.On this basis, the utility model temperature resolution can reach 0.03 ℃, also has the very fast temperature-responsive time, and the response time has been improved temperature measuring efficiency greatly less than 300ms.In addition, but the utility model demonstrated fully outside the intrinsic advantages such as anti-electromagnetic interference (EMI) Wavelength demodulation of fiber-optic grating sensor, also have a volume little, lightweight, can realize the probe-type temperature sensing, therefore have broad application prospects in the temperature measurement field.
Description of drawings
Fig. 1 is structural representation of the present utility model;
Fig. 2 is that fiber grating applies the pretension schematic diagram;
Description of reference numerals: metal tube 1, fiber grating 2, optical fiber jacket 3, optical fiber grating wavelength demodulating equipment 4, pretension bringing device 5.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing:
Embodiment: such as Fig. 1, the utility model is by fiber grating 2 of a metal tube 1 encapsulation, and two ends add that optical fiber jacket 3 combines.
At first, fiber grating 2 one ends and metal tube 1 one ends are fixed.Fiber grating 2 is penetrated metal tube 1, makes both center-aligned, stick with glue at an end points Jiao Kou place of metal tube 1 or the mode of laser bonding tail optical fiber and the metal tube 1 of fiber grating 2 is fixing.
Secondly, fiber grating 2 applies pretension.As shown in Figure 2, metal tube 1 is fixing, the tail optical fiber that fiber grating 2 is in an end of free state is fixed on the pretension bringing device 5, the tail optical fiber of fixing with metal tube 1 is connected with optical fiber grating wavelength demodulating equipment 4, comes the centre wavelength of Real-Time Monitoring fiber grating 2 by optical fiber grating wavelength demodulating equipment 4.Apply pretension for fiber grating 2, make its centre wavelength to long wave direction drift 2nm.Fiber grating 2 is not sticked with glue with the fixing end tail optical fiber of metal tube 1 or mode and the metal tube of laser bonding are fixed.
At last, the sealing of the protection of fiber grating 2 tail optical fibers and metal tube 1.Length is not less than the optical fiber jacket 3 of 30cm on fiber grating 2 two ends Pigtail sleeves, and the degree of depth that optical fiber jacket 3 is filled in metal tube 1 is not less than 2mm.Fix with epoxy glue between the tail optical fiber of optical fiber jacket 3 and metal tube 1, fiber grating 2.Some glue stomion at metal tube 1 enters an amount of epoxy glue, to avoid metal tube 1 interior water inlet in the use procedure.
The specific implementation step of this utility model thermometric is: sensor contacts with object under test, expanding with heat and contract with cold and the quick effect of hot photo-thermal of fiber grating of metal tube, the stretching of fiber grating or contraction, the drift of fiber bragg grating center wavelength, the counter variation of releasing temperature of the drift value of monitoring center's wavelength.
In addition to the implementation, the utility model can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of the utility model requirement.
Claims (8)
1. one kind responds high-sensitivity optical fibre grating temperature sensor fast, comprises a fiber grating (2), it is characterized in that: fiber grating (2) is outer to be provided with metal tube (1), is arranged with optical fiber jacket (3) on the two ends tail optical fiber of fiber grating (2).
2. quick response high-sensitivity optical fibre grating temperature sensor according to claim 1 is characterized in that: described metal tube (1) adopts brass, aluminium or stainless steel material, and its length is 30mm, and external diameter is 1.5mm, and internal diameter is 0.9mm.
3. quick response high-sensitivity optical fibre grating temperature sensor according to claim 1, it is characterized in that: described fiber grating (2) is bragg grating, and grid region length is 12 ~ 15mm, and reflectivity is not less than 80%, and two ends tail optical fiber length is not less than 1m.
4. quick response high-sensitivity optical fibre grating temperature sensor according to claim 1, it is characterized in that: described optical fiber jacket (3) external diameter is 0.9mm, and internal diameter is 0.4mm, and length is not less than 30cm.
5. quick response high-sensitivity optical fibre grating temperature sensor according to claim 1, it is characterized in that: fix by the mode of gluing or laser bonding between the tail optical fiber of described metal tube (1) and fiber grating (2), fiber grating (2) is located at the place, axle center of metal tube (1), and both center-aligned.
6. quick response high-sensitivity optical fibre grating temperature sensor according to claim 1, it is characterized in that: described fiber grating (2) is a certain size pretension in addition, and the fiber bragg grating center wavelength drift value that produces is about 2nm.
7. quick response high-sensitivity optical fibre grating temperature sensor according to claim 1 is characterized in that: fix by gluing mode between the tail optical fiber of described optical fiber jacket (3) and metal tube (1), fiber grating (2).
8. quick response high-sensitivity optical fibre grating temperature sensor according to claim 1, it is characterized in that: described metal tube (1) two ends seal with glue, and fiber grating (2) grid region is in the airtight air chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220430756.6U CN202757707U (en) | 2012-08-28 | 2012-08-28 | Rapid response high sensitivity fiber grating temperature sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220430756.6U CN202757707U (en) | 2012-08-28 | 2012-08-28 | Rapid response high sensitivity fiber grating temperature sensor |
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| Publication Number | Publication Date |
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| CN202757707U true CN202757707U (en) | 2013-02-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201220430756.6U Expired - Lifetime CN202757707U (en) | 2012-08-28 | 2012-08-28 | Rapid response high sensitivity fiber grating temperature sensor |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105021308A (en) * | 2015-07-15 | 2015-11-04 | 哈尔滨工程大学 | Method for manufacturing aluminium modification-enhanced fiber bragg grating temperature sensor |
| CN105628621A (en) * | 2016-02-02 | 2016-06-01 | 浙江工业大学 | Heatless on-chip integrated optical waveguide biosensor chip |
| CN108151909A (en) * | 2017-12-26 | 2018-06-12 | 北京信息科技大学 | A kind of superelevation temperature sensor based on FBG |
| CN108151917A (en) * | 2018-02-01 | 2018-06-12 | 天津城建大学 | Fiber-optical grating temperature sensor response time test device |
-
2012
- 2012-08-28 CN CN201220430756.6U patent/CN202757707U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105021308A (en) * | 2015-07-15 | 2015-11-04 | 哈尔滨工程大学 | Method for manufacturing aluminium modification-enhanced fiber bragg grating temperature sensor |
| CN105628621A (en) * | 2016-02-02 | 2016-06-01 | 浙江工业大学 | Heatless on-chip integrated optical waveguide biosensor chip |
| CN105628621B (en) * | 2016-02-02 | 2018-07-03 | 浙江工业大学 | The optical waveguide biosensor sensor chip that a kind of on piece without heat integrates |
| CN108151909A (en) * | 2017-12-26 | 2018-06-12 | 北京信息科技大学 | A kind of superelevation temperature sensor based on FBG |
| CN108151917A (en) * | 2018-02-01 | 2018-06-12 | 天津城建大学 | Fiber-optical grating temperature sensor response time test device |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130227 |
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| CX01 | Expiry of patent term |