CN104977098A - High-sensitivity fiber grating temperature sensor with fast response speed - Google Patents
High-sensitivity fiber grating temperature sensor with fast response speed Download PDFInfo
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- CN104977098A CN104977098A CN201510415655.XA CN201510415655A CN104977098A CN 104977098 A CN104977098 A CN 104977098A CN 201510415655 A CN201510415655 A CN 201510415655A CN 104977098 A CN104977098 A CN 104977098A
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Abstract
The invention discloses a high-sensitivity fiber grating temperature sensor with a fast response speed, which comprises a cylindrical tubular temperature-sensing metal casing with an opening. The temperature-sensing metal casing is internally provided with a fiber; the middle part of the fiber is provided with a section of grating; the temperature-sensing metal casing is internally provided with a temperature sensitization device; and the gap between the temperature-sensing metal casing and the temperature sensitization device is filled with heat conduction medium. The high-sensitivity fiber grating temperature sensor with a fast response speed is characterized in that the temperature sensitization device is a cylindrical metal rod whose length is smaller than that of the fiber; a through grieve is arranged along the axial direction of the cylindrical metal rod; the fiber with the section of grating is fixed in the axial through groove of the cylindrical metal rod; one section, extending out of the cylindrical metal rod, of the fiber reaches in the heat conduction medium; and a fixed plug plugs the opening of the temperature-sensing metal casing and a waterproof adhesive is used for sealing, and the fiber can be protected inside the temperature-sensing metal casing. The high-sensitivity fiber grating temperature sensor with a fast response speed has the advantages of small size, fast response speed, high sensitivity, and good working effects.
Description
Technical field
The invention belongs to sensory field of optic fibre, relate to a kind of high-sensitivity optical fibre grating temperature sensor of fast response time.
Background technology
It is low that traditional temperature sensor has acquisition precision, is subject to electromagnetic interference (EMI), poor stability, can not detect in working environment severe again, and fiber-optic grating sensor has the advantage that conventional temperature sensor does not have, as simple in sensing probe structure, size is little, quality is light, shape variable, be suitable for scope wide, electromagnetism interference, electrical isolation, corrosion-resistant, essential safety; Good endurance, chemical property is extremely stable, is adapted at using in the rugged surroundings such as high temperature, chemical erosion; Fiber grating can cause the change of wavelength by the change of environment temperature, so fiber-optical grating temperature sensor applies the feature of grating and the temperature sensor that makes just.But limitting by material own, the response speed of fiber-optical grating temperature sensor is slower than conventional temperature sensor response speed, makes these application scenarios to use fiber-optical grating temperature sensor.Separately because the sensitivity of fiber grating own is lower, higher for requiring general demodulation instrument, cause range of application limited, application cost improves.
Summary of the invention
The invention provides the high-sensitivity temperature sensor that a kind of response speed is exceedingly fast, the response speed overcoming existing fiber grating temperature sensor is low, the problem of poor sensitivity.
For solving the problems of the technologies described above, the present invention adopts following technical scheme to realize:
A kind of high-sensitivity optical fibre grating temperature sensor of fast response time, comprise a temperature sensing metal shell with the cylindrical barrel of opening part, an optical fiber is had in temperature sensing metal shell, one section of fiber grating is had in the middle part of optical fiber, temperature sensitizing device is had in temperature sensing metal shell, heat-conduction medium is filled with between temperature sensing metal shell and temperature sensitizing device, it is characterized in that, temperature sensitizing device is the cylinder metal rod that a length is less than the length of optical fiber, axis along cylinder metal rod has a groove, optical fiber is fixed in the groove of the axis of cylinder metal rod with a section of fiber grating, optical fiber one section of stretching out outside cylinder metal rod extend in heat-conducting medium, a fixing plug is blocked the opening part of temperature sensing metal shell and seals with marine glue, for the protection of the fiber section of the inside at temperature sensing metal shell,
Further technical scheme comprises:
Described cylinder metal rod is red copper material;
Described cylinder metal rod is of a size of diameter 2mm, length 13mm, and the diameter along the groove of cylinder metal rod axis is 0.3mm;
Described heat-conduction medium (2) is heat-conducting silicone grease;
Described temperature sensing metal shell (1) diameter is 4mm, and length is 15mm.
Compared with prior art the invention has the beneficial effects as follows:
The sensitivity of fiber-optical grating temperature sensor common is at present lower, makes these application scenarios to use fiber-optical grating temperature sensor.The present invention selects metal material to select red copper bar as temperature sensitizing device, and the thermal expansivity utilizing it larger applies the stretching of an axis to fiber grating, reaches effect of enhanced sensitivity, of the present invention.
Fiber-optical grating temperature sensor common at present, response speed is lower, cannot meet high-precision temperature survey.The present invention uses heat-conducting silicone grease as heat-conduction medium, temperature-responsive speed is improved on the one hand by filling heat-conducting silicone grease, temperature sensitizing device is prevented to be subject to the impact of external force on the other hand, because the power sensitivity characteristic of fiber grating, for the shock in use procedure or rock the wavelength shift that can cause fiber grating, thus cause measuring error.
Accompanying drawing explanation
Fig. 1 is the structural representation of the high-sensitivity optical fibre grating temperature sensor of a kind of fast response time of the present invention;
Fig. 2 is the temperature sensitizing device architecture schematic diagram in the high-sensitivity optical fibre grating temperature sensor of a kind of fast response time of the present invention;
Fig. 3 is the temperature sensitizing measure of merit figure of the high-sensitivity optical fibre grating temperature sensor of a kind of fast response time of the present invention;
Fig. 4 is the response speed test pattern of the high-sensitivity optical fibre grating temperature sensor of a kind of fast response time of the present invention.
In figure: 1, temperature sensing metal shell, 2, heat-conduction medium, 3, temperature sensitizing device, 4, fiber grating, 5, optical fiber, 6, fixing plug.
Embodiment
Below in conjunction with accompanying drawing, the present invention is explained in detail:
A kind of high-sensitivity optical fibre grating temperature sensor of fast response time, comprise a temperature sensing metal shell 1 with the cylindrical barrel of opening part, an optical fiber 5 is had in temperature sensing metal shell 1, one section of fiber grating 4 is had in the middle part of optical fiber 5, temperature sensitizing device 3 is had in temperature sensing metal shell 1, heat-conduction medium 2 is filled with between temperature sensing metal shell 1 and temperature sensitizing device 3, temperature sensitizing device 3 is the cylinder metal rod that a length is less than the length of optical fiber 5, axis along cylinder metal rod has a groove, optical fiber 5 is fixed in the groove of the axis of cylinder metal rod with a section of fiber grating 4, optical fiber 5 one section of stretching out outside cylinder metal rod extend in heat-conducting medium 2, a fixing plug 6 is blocked the opening part of temperature sensing metal shell 1 and seals with marine glue, for the protection of optical fiber 5 part of the inside at temperature sensing metal shell 1.Adopt cure silicone rubber to be fixed optical fiber 5 in cylinder metal rod both sides, recycling heat-curable epoxy resin glue is fixed grating 4 part.Described temperature sensing metal shell 1 diameter is 4mm, and length is 15mm.Cylinder metal rod is red copper material, and cylinder metal rod is of a size of diameter 2mm, length 13mm, and the diameter along the groove of cylinder metal rod axis is 0.3mm, and described heat-conduction medium 2 is heat-conducting silicone grease.
The high-sensitivity optical fibre grating temperature sensor principle of work of a kind of fast response time of the present invention:
The invention provides the high-sensitivity temperature sensor that response speed is exceedingly fast.High sensitivity is embodied in owing to fiber grating and metal bar being fit together, the thermal expansivity of metal side is far longer than the thermal expansivity of optical fiber, namely under identical temperature variations, the elongation that because of metal temperature rises will be far longer than the elongation of optical fiber, optical fiber is imbedded after in the glue be connected with metal, can stretch in the lump along with metal, so when stretching when the very little temperature variation of because of metal, optical fiber also can stretch along with metal in the lump, plays effect of enhanced sensitivity.Namely
temperature sensor after enhanced sensitivity and the calibration of sensor Data Comparison before enhanced sensitivity, as shown in Figure 3, common calibration of sensor curve is Δ λ=9.127 Δ T+161.955, and the calibration of sensor curve after enhanced sensitivity is Δ λ=32.303 Δ T+616.55.Therefore by being encapsulated in by grating on enhanced sensitivity device, the temperature-sensitivity coefficient of grating, by former 9.127pm/ DEG C, is increased to 32.3pm/ DEG C, improves 3.5 times.
The guarantee of high response speed: adopt the minimum metal steel pipe of size to do temperature sensing metal shell in order to ensure high response speed this product, size is only diameter 4mm, length 15mm, more than 3 times are reduced from volume than conventional fiber grating temperature sensor, thermal capacitance is reduced by reduced volume, reach the high response speed of extraneous temperature-sensitive, inner high response speed is realized by the heat-conduction medium heat-conducting silicone grease be filled in the middle of temperature sensing metal shell and temperature sensitizing device, and experiment proves that heat-conducting silicone grease has high efficiency for heat transfer.Ambient temperature uses the shortest Time Transmission to fiber grating by the temperature transmission of twice ultrahigh in efficiency by this product, realizes high response.
Contrast experiment adopts the temperature sensor of common non-enhanced sensitivity and this product to carry out the contrast of temperature-responsive speed, experimental technique: under two sensors are placed in the identical environment of temperature stabilization, waters calibration cell is warming up to 60 degree stable after, two sensors are put in the calibration cell of waters simultaneously, and interval 100ms preserves data.
As shown in Figure 4, this product has only used through the high response speed fiber-optical grating temperature sensor of particular design the temperature stabilization just reaching 60 degree of temperature difference less than 3s, ordinary optic fibre grating temperature sensor has then used nearly 8s just to reach temperature stabilization, speed improves nearly 3 times, has very large meaning for the occasion that ask for something corresponding speed is fast.
Claims (5)
1. the high-sensitivity optical fibre grating temperature sensor of a fast response time, comprise a temperature sensing metal shell (1) with the cylindrical barrel of opening part, an optical fiber (5) is had in temperature sensing metal shell (1), there is one section of fiber grating (4) at optical fiber (5) middle part, temperature sensitizing device (3) is had in temperature sensing metal shell (1), heat-conduction medium (2) is filled with between temperature sensing metal shell (1) and temperature sensitizing device (3), it is characterized in that, temperature sensitizing device (3) is the cylinder metal rod that a length is less than the length of optical fiber (5), axis along cylinder metal rod has a groove, optical fiber (5) is fixed in the groove of the axis of cylinder metal rod with a section of fiber grating (4), optical fiber (5) a section of stretching out outside cylinder metal rod extend in heat-conducting medium (2), a fixing plug (6) is blocked the opening part of temperature sensing metal shell (1) and seals with marine glue, for the protection of optical fiber (5) part of the inside at temperature sensing metal shell (1).
2. according to the high-sensitivity optical fibre grating temperature sensor of the said a kind of fast response time of claim 1, it is characterized in that, described cylinder metal rod is red copper material.
3. according to the high-sensitivity optical fibre grating temperature sensor of the said a kind of fast response time of claim 1 or 2, it is characterized in that, described cylinder metal rod is of a size of diameter 2mm, length 13mm, and the diameter along the groove of cylinder metal rod axis is 0.3mm.
4. according to the high-sensitivity optical fibre grating temperature sensor of the said a kind of fast response time of claim 1, it is characterized in that, described heat-conduction medium (2) is heat-conducting silicone grease.
5. according to the high-sensitivity optical fibre grating temperature sensor of the said a kind of fast response time of claim 1, it is characterized in that, described temperature sensing metal shell (1) diameter is 4mm, and length is 15mm.
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Cited By (10)
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| CN106546356A (en) * | 2017-01-12 | 2017-03-29 | 吉林大学 | A kind of resistant to elevated temperatures fiber-optical grating temperature sensor |
| CN106644156A (en) * | 2016-10-28 | 2017-05-10 | 北京信息科技大学 | Fiber grating temperature sensor for measuring vacuum environment temperature |
| 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 |
| CN108645534A (en) * | 2018-05-24 | 2018-10-12 | 哈尔滨博检精测科技有限公司 | Train axle temperature wheel temperature on-line monitoring system based on fiber grating |
| CN109085684A (en) * | 2018-10-11 | 2018-12-25 | 宜昌睿传光电技术有限公司 | A kind of skeleton optical fiber and grating sensing temperature optical cable |
| CN110542492A (en) * | 2019-10-10 | 2019-12-06 | 深圳市基础工程有限公司 | Fiber grating temperature sensor with built-in heat-conducting liquid |
| CN110579249A (en) * | 2019-09-17 | 2019-12-17 | 西北大学 | Co-doped multimode fiber bragg grating based hot-wire flow sensor and manufacturing method thereof |
| CN110579250A (en) * | 2019-09-17 | 2019-12-17 | 西北大学 | Fiber bragg grating flow sensor based on low-starting-flow and preparation method thereof |
| CN111121989A (en) * | 2019-12-05 | 2020-05-08 | 合肥通用机械研究院有限公司 | Fluid detection device |
| CN113125041A (en) * | 2021-04-15 | 2021-07-16 | 武汉理工大学 | Dual-sensitivity high-sensitivity FBG temperature sensor and manufacturing method thereof |
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Cited By (12)
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| CN106644156A (en) * | 2016-10-28 | 2017-05-10 | 北京信息科技大学 | Fiber grating temperature sensor for measuring vacuum environment temperature |
| CN106546356A (en) * | 2017-01-12 | 2017-03-29 | 吉林大学 | A kind of resistant to elevated temperatures fiber-optical grating temperature sensor |
| CN108645534A (en) * | 2018-05-24 | 2018-10-12 | 哈尔滨博检精测科技有限公司 | Train axle temperature wheel temperature on-line monitoring system based on fiber grating |
| 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 |
| CN109085684A (en) * | 2018-10-11 | 2018-12-25 | 宜昌睿传光电技术有限公司 | A kind of skeleton optical fiber and grating sensing temperature optical cable |
| CN110579249A (en) * | 2019-09-17 | 2019-12-17 | 西北大学 | Co-doped multimode fiber bragg grating based hot-wire flow sensor and manufacturing method thereof |
| CN110579250A (en) * | 2019-09-17 | 2019-12-17 | 西北大学 | Fiber bragg grating flow sensor based on low-starting-flow and preparation method thereof |
| CN110579249B (en) * | 2019-09-17 | 2021-06-29 | 西北大学 | Hot-wire flow sensor based on cobalt-doped multimode fiber bragg grating and manufacturing method |
| CN110542492A (en) * | 2019-10-10 | 2019-12-06 | 深圳市基础工程有限公司 | Fiber grating temperature sensor with built-in heat-conducting liquid |
| CN111121989A (en) * | 2019-12-05 | 2020-05-08 | 合肥通用机械研究院有限公司 | Fluid detection device |
| CN113125041A (en) * | 2021-04-15 | 2021-07-16 | 武汉理工大学 | Dual-sensitivity high-sensitivity FBG temperature sensor and manufacturing method thereof |
| CN113125041B (en) * | 2021-04-15 | 2022-01-11 | 武汉理工大学 | Dual-sensitivity high-sensitivity FBG temperature sensor and manufacturing method thereof |
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