CN201425524Y - Fiber bragg grating type temperature sensor - Google Patents
Fiber bragg grating type temperature sensor Download PDFInfo
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- CN201425524Y CN201425524Y CN200920067781.0U CN200920067781U CN201425524Y CN 201425524 Y CN201425524 Y CN 201425524Y CN 200920067781 U CN200920067781 U CN 200920067781U CN 201425524 Y CN201425524 Y CN 201425524Y
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Abstract
The utility model relates to a fiber bragg grating type temperature sensor which solves the technical problems that the fiber bragg grating type temperature sensor is provided and is not affected by external pulling force, has good stability and is easy to manufacture; the fiber bragg grating type temperature sensor is characterized in that: the sensor comprises a base material made of metal and an optical fiber (2) carved with optical grating (1) in the middle; one part of the optical fiber (2) carved with optical grating (1) is bend into a round ring, and the optical fiber at two sides of the optical grating area are led out to left and right respectively after being overlapped; an optical fiber overlapping area (4) is fixedly connected with the surface of the base material (3), two leading-out ends (5) of the optical fiber are coated with glue or added with a fiber pigtail protective sleeve to protect the leading-out ends. Compared with the temperature sensors with other structures,the temperature sensor in the utility model has the advantages of simple structure, stable performance and easy package. By adopting the packaging way, the temperature sensitivity of the original optical fiber can be kept, the volume is small and the process requirements are low relatively, thereby being suitable for building a sensing array with multi-point temperature monitoring.
Description
Technical field:
The utility model relates to fibre optic temperature sensor.
Background technology:
Fiber grating is that a kind of fiber core refractive index has periodically variable fiber optic passive device.Because the resonance wavelength of fiber grating is relatively more responsive to the variation of external environments such as temperature, strain, the resonance wavelength of grating can change with temperature, so just can obtain the variation of temperature amount by surveying its wavelength change amount.Fiber grating has that volume is little, good reliability, anti-electromagnetic interference (EMI), advantage such as anticorrosive, has therefore obtained using widely at sensory field.Wherein, the grating type optical fiber temperature sensor also can be used as the temperature compensation of optical fiber grating sensing network owing to both can be applied to the distributed measurement in structure temperature field, has been subjected to people and has more and more paid close attention to.Yet,,, how to solve temperature/stress cross sensitivity problem and just seem particularly important because the resonance wavelength of grating is being subjected to the influence of temperature and strain simultaneously for the grating type sensor.For fiber-optical grating temperature sensor, in some special working environments, because the pulling or the scratching of external force, the tail optical fiber of sensor (signal transmssion line just) is easy to be subjected to the external force influence, cause the centre wavelength of grating to fluctuate, bring bigger error to temperature sensing with the external force variation.In order to address this problem, need consider from the encapsulating structure of sensor, produce the insensitive temperature sensor of pulling force.
People such as Francis M.Haran clip the tail optical fiber of fiber grating one end, and it is encapsulated in a quartzy cap the inside (U.S.Pat.No.6,125,216, entitled " Strain isolated optical fibrebragg grating sensor ") (see Fig. 1,11 is Transmission Fibers among Fig. 1; 12 is epoxy sealing; 13 is the tail optical fiber sheath; 14 is fiber grating).Because an end of grating is unsettled, thus the pulling force of other end tail optical fiber affact on the grating region, thereby realized and purpose that pulling force is irrelevant.But the greatest problem of this encapsulating structure is that it can only be suitable for the temperature survey of single-point, and can not be used for the distributive array sensing of temperature.People such as Christopher J.Wright are encapsulated in (U.S.Pat.No.6 in the thicker quartz ampoule by fusing mode with fiber grating, 865,194B1, entitled " Strain-isolatedbragg grating temperature sensor ") (see Fig. 2,21 is Transmission Fibers among Fig. 2; 22 is tackifier; 23 is fiber grating; 24 are substrate).This encapsulating structure utilizes the intensity that increases grating region of quartz ampoule, makes its effect to external force insensitive.But this packaged type is not got rid of the influence of external force fully, and when pulling force was very big, quartz ampoule still tangible deformation can take place, and caused the drift of grating wavelength.People such as Mark R.Fernald are encapsulated in grating region earlier in the one thin quartz ampoule, and the tail optical fiber of an end is packaged in (U.S.Pat.No.6 in the thick quartz ampoule after the bending in addition again, 452,667B1, entitled " Pressure-isolated bragg grating temperature sensor ").This packaged type utilizes the bending of optical fiber that institute's externally applied forces on the tail optical fiber is cushioned, and has played good effect.People such as Zhou Zhi utilize similar principle also to design the irrelevant grating type temperature sensor of pulling force (referring to document " no external force influences the optical fiber Bragg raster encapsulation temperature sensor ", from periodical " sensor and micro-system ", 2006,25 the 3rd phases of volume, the 57th～62 page) (see Fig. 3,31 is fiber grating among Fig. 3; 32 is quartz ampoule; 33 is optical fiber; 34 is fixed part).But the packaging technology of this structure is comparatively complicated, and in order to guarantee the amount of bow of optical fiber, the sleeve pipe that needs protection has certain diameter and length.
The utility model content:
Technical problem to be solved in the utility model is to provide a kind of grating type optical fiber temperature sensor, has that the external pull of not being subjected to influences, good stability and the performance that is easy to make.
For solving the problems of the technologies described above, the utility model is to propose following technical scheme to realize:
A kind of grating type optical fiber temperature sensor is characterized in that: described sensor comprises the optical fiber 2 that is carved with grating 1 for the base material of metal material and middle part; The part that described optical fiber is carved with grating curves the optical fiber on an annulus and grating region both sides and draws to the left and right sides respectively behind overlapping; Affixed between described optical fiber crossover region 4 and base material 3 surfaces; On two exits 5 of optical fiber, be coated with gluing or add that the optical fiber pigtail sheath is protected it.
Described optical fiber 1 can be the multiple optical fiber that can write grating, can be doping silica fibre or plastic optical fiber or photonic crystal fiber etc.
Described grating 2 can be the multiple optical fiber sensing temperature grating that can be used in, and can be common Bragg fiber grating or sampling optical-fiber grating or phase-shifted fiber grating or overlapping fiber grating or long period fiber grating etc.
Described base material 3 can be the metal material of arbitrary shape, plays the effect of transmitting temperature and protection grating.
Position 4 fixed forms that described optical fiber overlaps can be various ways, can be splicing or metal solder or quartzy welding etc.
Described fiber bending radius R is changeable, and least radius is not to bring obvious bending loss to exceed to optical fiber.
The utility model brings following beneficial effect:
When the residing environment temperature of sensor changed, by the heat conduction of base material 3, the temperature of grating region 1 also produced corresponding variation.Because the thermo-optic effect of fiber optic materials and effect when expanding with heat and contract with cold effect, the resonance wavelength of grating can change.Just can obtain the variation of temperature amount by surveying its wavelength change amount.And when optical fiber 2 is subjected to the external pull effect, the sticky object of optical fiber crossover region 4 and base material will bear all pulling force, and the grating region 1 that is in ring-like central authorities will not be subjected to the influence of pulling force.In addition, because grating region 1 is to adopt the fixing mode of single-point to be fixed on the base material 3, when base material is subjected to the effect of external force or owing to expanding with heat and contract with cold deformation takes place, grating region will not be affected yet.
Thereby grating type optical fiber temperature sensor of the present utility model is compared with the temperature sensor of other structure, has simple in structure, stable performance and is easy to advantages such as encapsulation.Adopt this kind packaged type, can keep the temperature control of original fiber grating, and volume is little, technological requirement is relatively low, is fit to set up the sensor array of multipoint temperature monitoring.
Description of drawings:
Fig. 1: first kind of insensitive packing forms of pulling force
Fig. 2: second kind of insensitive packing forms of pulling force
Fig. 3: the insensitive packing forms of the third pulling force
Fig. 4: grating type optical fiber temperature sensor synoptic diagram of the present utility model
Fig. 5: the temperature-responsive contrast before and after the grating encapsulation
Fig. 6: pull force tester synoptic diagram
Embodiment:
Below in conjunction with the drawings and specific embodiments the utility model is further described:
In conjunction with referring to Fig. 4, in the present embodiment, we select a common single mode telecommunication optical fiber 2, adopt the mode of high ballast hydrogen to improve its photosensitivity, and utilize the method for ultraviolet light irradiation, and writing length on its fibre core is the Uniform B ragg grating 1 of 1cm, the grating cycle is 535 μ m.After grating has been scribed, put it into temperature and be in 130 ℃ the baking oven annealing 24 hours.The reflection kernel wavelength that records under its room temperature is 1551.385nm, and reflectivity is about 95%.Subsequently, we utilize temperature control box to measure the temperature response characteristics of this fiber grating-10～+ 50 ℃.Then; we bend to the ring-type that radius R is 13mm (grating region of 1cm is in the middle part of annular) with this fiber grating; and utilize epoxy resin that the overlapping region 4 of optical fiber is affixed to a diameter to be 30mm; thickness is on the circular stainless steel metal substrate 3 of 1mm, and adds that at the exit 5 of optical fiber the tail optical fiber sheath of rubber is in order to protection optical fiber.Resonance wave long value before and after the bending of contrast grating, the variable quantity of the 1pm that at room temperature only has an appointment.Reflected optical power before and after the bending of contrast grating, variable quantity is less than 0.1dB.
After the encapsulation of grating type temperature sensor finished, we had carried out the test of temperature response characteristics and pulling force sensitivity characteristic to it.We put it into earlier and have measured-10～+ 50 ℃ temperature response characteristics in the temperature control box.Test findings as shown in Figure 5.Test data shows that the temperature response characteristics of temperature response characteristics after the encapsulation and naked grating is almost without any change.Then, we utilize device shown in Figure 6 that it is carried out tensile test, and 61 is optic fibre fixing device among Fig. 6, and 62 is temperature sensor; 63 is fine.The weight of mass M directly is loaded on the optical fiber 63 of 250 μ m diameters.Test findings shows that in the weight range of 0～2Kg, grating reflection centre wavelength is without any change.Because the pulling force ultimate value that the pulling force of 2Kg can bear near optical fiber.So do not continue to increase the weight of mass M.If add that on output optical fibre high-intensity cable sleeve is protected, this temperature sensor can bear tens Kg even bigger pulling force and wavelength is unaffected so.
Owing to when making grating, need peel off the optical fiber coating of certain-length at grating region.And when carrying out fibre-optical bending, because the toughness of bare fibre is poor, so exist because misoperation causes the possibility of grating fracture.In order to guarantee the integrity of grating in the encapsulation process, can on the bare fibre of grating region, utilize the heavy coating machine of optical fiber to coat layer protective layer in advance.
In addition, because the optical fiber that adopts is common telecommunication optical fiber, its minimum bending radius is greater than 10mm, and this has also determined the minimum area of sensor.If wish the area of further sensor, just need reduce the bending radius of optical fiber.At this moment, can adopt the special optical fiber of little mode field diameter.For example certain cladding diameter is 80 μ m, and core diameter is the homemade step change type silica fibre of 6 μ m, and its minimum bending radius can reach 6mm and luminous power does not have any loss.
Claims (4)
1, a kind of grating type optical fiber temperature sensor is characterized in that: described sensor comprises for the base material of metal material and a middle part being carved with the optical fiber (2) of grating (1); The part that described optical fiber is carved with grating curves the optical fiber on an annulus and grating region both sides and draws to the left and right sides respectively behind overlapping; Affixed between described optical fiber crossover region (4) and base material (3) surface; On two exits (5) of optical fiber, be coated with gluing or add that the optical fiber pigtail sheath is protected it.
2, according to the described a kind of grating type optical fiber temperature sensor of claim 1, it is characterized in that: described optical fiber (1) can be doping silica fibre or plastic optical fiber or photonic crystal fiber for writing the optical fiber of grating.
3, according to the described a kind of grating type optical fiber temperature sensor of claim 1, it is characterized in that: described grating (2) can be common Bragg fiber grating or sampling optical-fiber grating or phase-shifted fiber grating or overlapping fiber grating or long period fiber grating for can be used in the optical fiber sensing temperature grating.
4, according to the described a kind of grating type optical fiber temperature sensor of claim 1, it is characterized in that: the affixed mode between described optical fiber crossover region (4) and the base material can be splicing or metal solder or quartzy welding.
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| CN200920067781.0U CN201425524Y (en) | 2009-02-17 | 2009-02-17 | Fiber bragg grating type temperature sensor |
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| CN200920067781.0U CN201425524Y (en) | 2009-02-17 | 2009-02-17 | Fiber bragg grating type temperature sensor |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102401700A (en) * | 2010-09-10 | 2012-04-04 | 北京蔚蓝仕科技有限公司 | Single-end temperature measurement sensor for fiber Bragg grating |
| CN103698048A (en) * | 2013-12-09 | 2014-04-02 | 中国计量学院 | Simple high-sensitivity optical-fiber temperature sensor |
| CN105157873A (en) * | 2015-05-18 | 2015-12-16 | 武汉理工大学 | Circular ring type fiber bragg grating (FBG) temperature sensor and encapsulation method |
| CN106908171A (en) * | 2017-03-23 | 2017-06-30 | 江苏骏龙光电科技股份有限公司 | A kind of high temperature resistant ring-type packaged fiber grating sensor for switch cubicle |
| CN107421656A (en) * | 2017-06-16 | 2017-12-01 | 武汉理工大学 | One kind exempts from stress twin-core and with temperature sensing optical fiber preparation facilities and method |
| CN109141683A (en) * | 2018-10-11 | 2019-01-04 | 三峡大学 | A kind of caliberating device and method of linear temperature sensor array |
| CN111811685A (en) * | 2020-07-22 | 2020-10-23 | 广州大学 | Fiber grating temperature sensor, assembly and manufacturing method |
| CN112067155A (en) * | 2020-11-11 | 2020-12-11 | 武汉昊衡科技有限公司 | Lithium battery temperature dynamic monitoring method based on OFDR |
| CN112567219A (en) * | 2018-08-14 | 2021-03-26 | Fbg韩国公司 | Temperature measuring device using fiber grating sensor |
-
2009
- 2009-02-17 CN CN200920067781.0U patent/CN201425524Y/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102401700A (en) * | 2010-09-10 | 2012-04-04 | 北京蔚蓝仕科技有限公司 | Single-end temperature measurement sensor for fiber Bragg grating |
| CN103698048A (en) * | 2013-12-09 | 2014-04-02 | 中国计量学院 | Simple high-sensitivity optical-fiber temperature sensor |
| CN105157873A (en) * | 2015-05-18 | 2015-12-16 | 武汉理工大学 | Circular ring type fiber bragg grating (FBG) temperature sensor and encapsulation method |
| CN106908171A (en) * | 2017-03-23 | 2017-06-30 | 江苏骏龙光电科技股份有限公司 | A kind of high temperature resistant ring-type packaged fiber grating sensor for switch cubicle |
| CN107421656A (en) * | 2017-06-16 | 2017-12-01 | 武汉理工大学 | One kind exempts from stress twin-core and with temperature sensing optical fiber preparation facilities and method |
| CN112567219A (en) * | 2018-08-14 | 2021-03-26 | Fbg韩国公司 | Temperature measuring device using fiber grating sensor |
| CN109141683A (en) * | 2018-10-11 | 2019-01-04 | 三峡大学 | A kind of caliberating device and method of linear temperature sensor array |
| CN109141683B (en) * | 2018-10-11 | 2024-03-12 | 三峡大学 | Calibration device and method for linear temperature sensor array |
| CN111811685A (en) * | 2020-07-22 | 2020-10-23 | 广州大学 | Fiber grating temperature sensor, assembly and manufacturing method |
| CN112067155A (en) * | 2020-11-11 | 2020-12-11 | 武汉昊衡科技有限公司 | Lithium battery temperature dynamic monitoring method based on OFDR |
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Granted publication date: 20100317 |
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| CX01 | Expiry of patent term |