CN205138672U - Quick response fiber grating temperature sensor steady in a long -term - Google Patents
Quick response fiber grating temperature sensor steady in a long -term Download PDFInfo
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- CN205138672U CN205138672U CN201520796713.3U CN201520796713U CN205138672U CN 205138672 U CN205138672 U CN 205138672U CN 201520796713 U CN201520796713 U CN 201520796713U CN 205138672 U CN205138672 U CN 205138672U
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Abstract
The utility model relates to a quick response fiber grating temperature sensor steady in a long -term to in single -ended sealed tubular metal resonator conduct encapsulation shell, fiber grating were fixed in the single -end tubular metal resonator, there was certain interval in the sealed end inside of grid region afterbody and tubular metal resonator, makes the grid region be complete free state, therefore insensitive to environmental stress, had ensured the long term stability of sensor. The whole size of sensor is very little, and the space is little between grating and the encapsulation shell, and material heat conduction is fast, has ensured that the sensor is very fast to ambient temperature's response time. The utility model discloses still have anti -electromagnetic interference, light in weight, characteristics such as small, have wide application prospect in temperature measurement field.
Description
Technical field
The utility model belongs to fiber grating sensing technology field, mainly a kind of quick response fiber-optical grating temperature sensor of long-term stability.
Background technology
Fiber-optical grating temperature sensor has the advantages such as electromagnetism interference, volume are little, Wavelength-encoding, can be widely used in Aero-Space, bridge, tunnel, electric power, field of petrochemical industry.Common fiber-optical grating temperature sensor is divided into sensitizing type and non-sensitizing type two kinds.Sensitizing type fiber-optical grating temperature sensor is generally by optical fiber Bragg grating encapsulation in metal tube, and fiber grating applies a certain size pretension in encapsulation process.The fiber-optical grating temperature sensor of the type has higher temperature control, and can obtain higher temperature accuracy and resolution, but stress is more responsive to external world, long-time stability are poor.Non-sensitizing type fiber-optical grating temperature sensor is divided into both-end fiber and single-ended fiber two type.The non-sensitizing type fiber-optical grating temperature sensor of both-end fiber generally by optical fiber Bragg grating encapsulation in thicker metal tube, grid region is certain case of bending, makes its small strain to external world substantially insensitive.But when extraneous strain is larger, the case of bending of fiber grating can be had influence on, cause the drift of its reflection wavelength, thus reduce its stability.Optical fibre raster single end is generally fixed in metal tube by the non-sensitizing type fiber-optical grating temperature sensor of single-ended fiber, and grid region is complete free state, thus its stress is completely insensitive to external world, ensure that the long-time stability of sensor.
In practical engineering application, on the basis of guaranteeing temperature accuracy <0.5 DEG C, the long-time stability of measurement become the key point of fiber-optical grating temperature sensor.On the other hand, in the field of temperature measurement of some temperature real-time change as ocean temperature profile survey, very high requirement is proposed to the response time of sensor.The temperature sensor of quick response can the temperature variation of real time reaction measured object, also can greatly save measurement required time.
Utility model content
The purpose of this utility model is exactly to overcome above-mentioned problems of the prior art, and provides a kind of quick response fiber-optical grating temperature sensor of long-term stability.
The purpose of this utility model has been come by following technical solution.The quick response fiber-optical grating temperature sensor of this long-term stability, by a single-end sealed metal tube, a fiber grating is encapsulated, on the Pigtail sleeve of fiber grating, the optical fiber jacket of certain length is protected, and is connected between metal tube and optical fiber jacket by transfer tube; Described optical fibre raster single end is fixed in metal tube, and the spacing of grid region afterbody and metal tube sealed end inside is not less than 1mm, and grid region is complete free state; The outlet glue of described metal tube seals, and is formed in an airtight little air chamber, makes the stress of the grid region of fiber grating to environment insensitive.
Utilize High-strength adhesive bonding between described metal tube, fiber grating, optical fiber jacket, transfer tube.
Described single-ended be brass, aluminium or stainless steel material, its length is 20mm, and external diameter is for being not more than 1mm, and internal diameter is for being not less than 0.4mm.
Described fiber grating is bragg grating, and grid region length is 12 ~ 15mm, and reflectivity is not less than 80%.
Described optical fiber jacket external diameter is 0.9mm, and internal diameter is 0.4mm, and length is not less than 30cm; Described transfer tube material is identical with metal tube, and external diameter is not more than 2mm, and internal diameter is identical with the external diameter of metal tube, and length is not less than 5mm.
The beneficial effects of the utility model are:
1, pressure is insensitive to external world.The pressure that this fiber-optical grating temperature sensor can bear is not less than 5MPa.
2, long-time stability are good.Because sensor internal fiber grating is in free state all the time, insensitive to environmental stress, therefore there are good long-time stability.
3, the response time is fast.Overall sensor size is very little, and between grating and package casing, space is little, and material conducts heat is fast, ensure that the response time of sensors towards ambient temperature is very fast, is about 100ms.
In addition, the utility model has fully demonstrated the intrinsic electromagnetism interference of fiber-optic grating sensor, outside the advantage such as Wavelength demodulation, also can have volume little, lightweight, can realize probe-type temperature sensing, therefore had broad application prospects in temperature measurement field.
Accompanying drawing explanation
Fig. 1 is the diagrammatic cross-section of basic structure of the present utility model.
Fig. 2 is the fluctuation schematic diagram that the measured temperature of sensor changes with ambient pressure.
Wherein 1 is metal tube, and 2 is fiber gratings, and 3 is optical fiber jackets, and 4 is transfer tubes.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described further:
The quick response fiber-optical grating temperature sensor of this long-term stability described in the utility model, by a single-end sealed metal tube 1, a fiber grating 2 is encapsulated, on the Pigtail sleeve of fiber grating 2, the optical fiber jacket 3 of certain length is protected, and is connected between metal tube 1 and optical fiber jacket 3 by transfer tube 4; Described fiber grating 2 is single-ended to be fixed in metal tube 1, and the spacing of grid region afterbody and metal tube 1 sealed end inside is not less than 1mm, and grid region is complete free state; The outlet glue of described metal tube 1 seals, and is formed in an airtight little air chamber, makes the stress of the grid region of fiber grating 2 to environment insensitive.
The utility model proposes a kind of quick response fiber-optical grating temperature sensor of long-term stability, using single-end sealed metal tube as package casing, optical fibre raster single end is fixed in metal tube, there is certain spacing in grid region afterbody and metal tube sealed end inside, grid region is made to be complete free state, thus insensitive to environmental stress.The tail optical fiber of grating is protected by optical fiber jacket.The ultimate principle of sensor is, when ambient temperature changes, passes to fiber grating by metal tube, causes the drift of fiber bragg grating center wavelength, is realized the measurement of temperature by the wavelength shift of monitoring fiber grating.
Utilize High-strength adhesive bonding between described metal tube 1, fiber grating 2, optical fiber jacket 3, transfer tube 4.
Described single-ended be brass, aluminium or stainless steel material, its length is 20mm, and external diameter is for being not more than 1mm, and internal diameter is for being not less than 0.4mm.
Described fiber grating 2 is bragg grating, and grid region length is 12 ~ 15mm, and reflectivity is not less than 80%.
Described optical fiber jacket 3 external diameter is 0.9mm, and internal diameter is 0.4mm, and length is not less than 30cm; Described transfer tube 4 material is identical with metal tube 1, and external diameter is not more than 2mm, and internal diameter is identical with the external diameter of metal tube 1, and length is not less than 5mm.
Embodiment:
1, the selection of metal tube 1 material.Because sensor will take into account resistance to pressure and temperature-responsive time, therefore metal tube 1 has selected physical dimension less but the capillary brass tube that wall thickness is relatively large.Carry out simulation analysis by Solidworks software to the resistance to pressure of package casing, known under the pressure effect of 5MPa, the maximum stress of package casing is 1.25e7Pa, and the yield stress of brass material can reach 2.4e8Pa.Visible, metal tube 1 selects capillary brass tube can meet the pressure requirements of 5MPa as encapsulating material.
2, the structural design of sensor and encapsulation.Be fixed in metal tube 1 by single-ended for fiber grating 2, grid region is complete free state, and grid region afterbody distance metal tube 1 sealed end inside retains the space of about 1mm.Seal by smearing appropriate high strength epoxy between fiber grating 2 and metal tube 1; the tail optical fiber optical fiber jacket 3 of fiber grating 2 is protected; assembled by transfer tube 4 between optical fiber jacket 3 and metal tube 1; smearing appropriate high strength epoxy between three carries out bonding, can carry out a step encapsulation process to the intercropping of fiber grating 2 and metal tube 1 simultaneously.
3, sensor voltage-withstand test
Packaged sensor is put into head tank, continuous pressure is carried out to head tank, and the measured temperature of real-time read sensor, until be forced into design pressure, whether the measured temperature observing sensor produces drift with the increase of pressure.As shown in Figure 2, in the process of continuous pressure to 5MPa, not there is drift phenomenon in the measured temperature of sensor, then illustrate that the sealing means of sensor can bear design pressure.
In addition to the implementation, the utility model can also have other embodiments, and 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 (5)
1. a quick response fiber-optical grating temperature sensor steady in a long-term, it is characterized in that: by a single-end sealed metal tube (1), a fiber grating (2) is encapsulated, on the Pigtail sleeve of fiber grating (2), the optical fiber jacket (3) of certain length is protected, and is connected between metal tube (1) and optical fiber jacket (3) by transfer tube (4); Described fiber grating (2) is single-ended to be fixed in metal tube (1), and the spacing of grid region afterbody and metal tube (1) sealed end inside is not less than 1mm, and grid region is complete free state; The outlet glue of described metal tube (1) seals, and is formed in an airtight little air chamber, makes the stress of grid region to environment of fiber grating (2) insensitive.
2. the quick response fiber-optical grating temperature sensor of long-term stability according to claim 1, is characterized in that: described metal tube (1), fiber grating (2), optical fiber jacket (3), transfer tube utilize High-strength adhesive bonding between (4).
3. the quick response fiber-optical grating temperature sensor of long-term stability according to claim 1, is characterized in that: described single-ended be brass, aluminium or stainless steel material, its length is 20mm, and external diameter is for being not more than 1mm, and internal diameter is for being not less than 0.4mm.
4. the quick response fiber-optical grating temperature sensor of long-term stability according to claim 1, 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%.
5. the quick response fiber-optical grating temperature sensor of long-term stability according to claim 1, 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; Described transfer tube (4) material is identical with metal tube (1), and external diameter is not more than 2mm, and internal diameter is identical with the external diameter of metal tube (1), and length is not less than 5mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520796713.3U CN205138672U (en) | 2015-10-15 | 2015-10-15 | Quick response fiber grating temperature sensor steady in a long -term |
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| CN201520796713.3U CN205138672U (en) | 2015-10-15 | 2015-10-15 | Quick response fiber grating temperature sensor steady in a long -term |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106092368A (en) * | 2016-08-23 | 2016-11-09 | 长飞光纤光缆股份有限公司 | Bragg fiber-optical grating temperature sensor, temperature monitoring system and method |
| CN106525277A (en) * | 2016-11-01 | 2017-03-22 | 北京航空航天大学 | Unstressed encapsulated fiber grating temperature sensing string |
| CN106546356A (en) * | 2017-01-12 | 2017-03-29 | 吉林大学 | A kind of resistant to elevated temperatures fiber-optical grating temperature sensor |
| CN108362401A (en) * | 2018-02-01 | 2018-08-03 | 天津城建大学 | A kind of test method of fiber-optical grating temperature sensor response time |
| CN110907501A (en) * | 2019-12-10 | 2020-03-24 | 新余学院 | Flexible stretchable temperature/humidity sensor insensitive to strain and preparation method thereof |
-
2015
- 2015-10-15 CN CN201520796713.3U patent/CN205138672U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106092368A (en) * | 2016-08-23 | 2016-11-09 | 长飞光纤光缆股份有限公司 | Bragg fiber-optical grating temperature sensor, temperature monitoring system and method |
| CN106525277A (en) * | 2016-11-01 | 2017-03-22 | 北京航空航天大学 | Unstressed encapsulated fiber grating temperature sensing string |
| CN106525277B (en) * | 2016-11-01 | 2019-04-30 | 北京航空航天大学 | A kind of Non-stress packaging fiber grating temperature sensor string |
| CN106546356A (en) * | 2017-01-12 | 2017-03-29 | 吉林大学 | A kind of resistant to elevated temperatures fiber-optical grating temperature sensor |
| CN108362401A (en) * | 2018-02-01 | 2018-08-03 | 天津城建大学 | A kind of test method of fiber-optical grating temperature sensor response time |
| CN110907501A (en) * | 2019-12-10 | 2020-03-24 | 新余学院 | Flexible stretchable temperature/humidity sensor insensitive to strain and preparation method thereof |
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