CN103698048A - Simple high-sensitivity optical-fiber temperature sensor - Google Patents
Simple high-sensitivity optical-fiber temperature sensor Download PDFInfo
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- CN103698048A CN103698048A CN201310692158.5A CN201310692158A CN103698048A CN 103698048 A CN103698048 A CN 103698048A CN 201310692158 A CN201310692158 A CN 201310692158A CN 103698048 A CN103698048 A CN 103698048A
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Abstract
The invention relates to a simple and cheap temperature sensor. The temperature sensor is formed by only bending a segment of single-mode optical fiber with a coating and fixing the single-mode optical fiber into the shape of a liquid drop through glue; the increase of the birefringence of the single-mode optical fiber is caused by the bending of the optical fiber; when light passes through the segment of bent single-mode optical fiber, because a certain phase difference is caused by two beams of polarization-state light, the existence of an interference peak can be observed in a transmission spectrum. The drift of the interference peak in the transmission spectrum of the sensor along with the change of outside temperature is caused by the sensitivity of the birefringence to the change of the outside temperature caused by bending. The curvature radius of a semicircular optical-fiber part in the temperature sensor is 2 to 6mm.
Description
Technical field
The invention belongs to the design field of Fibre Optical Sensor, relate to birefraction detection to environment temperature to the sensitive realization of temperature that a kind of bending of general single mode fiber of application band coat causes.
Background technology
Optical fibre sensor structure is simple, volume is little, quality is light, under the occasion of inflammable and explosive and High Temperature High Pressure, application has the features such as safe and reliable, so developing of Fibre Optical Sensor gains great popularity, and obtains widespread use.Along with the fast development of optical fiber sensing technology, fibre optic temperature sensor gets the attention and studies.Due to the adaptive faculty of optical fiber to harsh environment itself; fibre optic temperature sensor can be measured the immeasurable occasion of conventional temperature sensor; such as inflammable and explosive high-risk environment such as storage tank; if utilize electricity temperature sensor to be easy to cause serious accident because of the electric spark of its generation; simultaneously because the volume of optical fiber itself is little; quality gently also can be utilized in the temperature survey of a lot of narrow and small environment etc., and the fibre optic temperature sensor of report is mainly divided into following a few class at present:
Temperature sensor based on micro-work sheet mode fiber, this sensor is mainly, by femto-second laser, fiber core and covering are carried out to high precision processing, thereby forms interferometer at inside of optical fibre.The optical path difference temperature sensor that the interference peaks of utilizing temperature on fiber and air chamber thermo-optical coeffecient and thermal expansion coefficient difference to cause is offset detected temperatures to change or the thermal expansion by optical fiber itself causes changes.The sensitivity that this temperature sensor is general is 10-100pm/ ℃, can measure temperature range large, working stability.Be that this sensor production process is comparatively complicated, the needed laser instrument of Precision Machining optical fiber and corresponding control system are had to higher requirement.
Temperature sensor based on hybridization optical fiber structure, this sensor is the cladding mode that utilizes the core diameter of two kinds or two or more different fiber not mate to cause and the interference between the basic mode in fibre core, because the thermal expansion effects of optical fiber itself carrys out temperature sensor, unitary construction is comparatively simple and easy, and manufacture difficulty is low.But its sensitivity is also generally 10-100pm/ ℃.
Temperature sensor based on fiber grating, mainly be divided into bragg grating temperature sensor and long period fiber-optical grating temperature sensor, the first fibre optic temperature sensor has lower cross sensitivity and can be used for distributed sensing, but but only has 10pm/ ℃ of left and right for the sensitivity of temperature.The have an appointment temperature control of 100pm/ ℃ of the second fibre optic temperature sensor, but it also has very high sensitivity to crooked and refractive index.
The temperature sensor that has liquid photonic crystal fiber based on filling, general photonic crystal fiber is very insensitive for temperature, but in air-gap, pour into after liquid, and liquid and quartzy thermo-optical coeffecient difference will be brought very high temperature control to photonic crystal fiber.Generally can reach several nanometers more than every degree Celsius.But its manufacturing process is comparatively loaded down with trivial details, especially selectively part air-gap pours into, and the price of photonic crystal fiber is also far away higher than general optical fiber.
In research in sum, existing fibre optic temperature sensor respectively has feature in performance and method for making, but all has a shortcoming separately, especially for the optical fiber structure of sensing, mostly is bare fibre, structure is comparatively fragile, so easily often need SC operation in destroyed application.Temperature sensor size based on micro-work sheet mode fiber is little, good stability, measurement range are large, but sensitivity is not high and manufacture craft more complicated.Temperature sensor production method based on hybridization optical fiber structure is simpler, but sensitivity is not high yet.In temperature sensor based on fiber grating, long-period fiber grating sensor temperature control is high but cross sensitivity is also high, and but the Bragg optical-fiber grating sensor that can be used for distributed sensing has little cross sensitivity be also very low to the sensitivity of temperature.But highly sensitive its manufacturing process of the temperature sensor based on pouring into liquid photonic crystal fiber comparatively complexity and cost high.At present, for fibre optic temperature sensor generally need to investigate its sensitivity, rugged construction degree, manufacture difficulty and cost etc.
Summary of the invention
Object of the present invention is exactly in order to overcome the problems such as existing fiber temperature sensor complex manufacturing technology, cost are high, fragile structure, has proposed a kind of high sensitivity optical fiber temperature sensor based on coat single-mode fiber.
The technical scheme that technical solution problem of the present invention is taked is:
By the single-mode fiber of one section of normal tape coat (as Corning, SMF-28) be bent into droplet-like, then the afterbody at bending optical fiber utilizes glue to be adhesively fixed, the optical fiber that light is formed by simple bending through this section can produce and interfere at exit end, utilize the impact of temperature on the birefraction of curved fiber, by transmission spectrum is carried out to the information that Wavelength demodulation obtains temperature, realize the measurement of environment temperature; Described glue can be common 502 glue, AB glue etc.;
Described curved fiber is that general single mode fiber with coat is (except bending, do not pass through any additional treatments), so can be carried out comparatively violent bending, form a droplet-like, the most serious crooked part can be similar to regards one section of semi-circular optical fiber as, its radius-of-curvature, between 2mm-6mm, is glued together get >=50mm of partial-length, thereby guarantees the Stability Analysis of Structures of sensing head.
The advantage that the present invention has is: by one section of simple bending, without any need for the single-mode fiber with coat of processing, just can form interferometer and for temperature sensing and there is higher temperature sensitivity.Cost of manufacture is low, and manufacturing process is simple, and the little and coat of sensor bulk can play the effect that protection sensor improves its structural stability, admittedly can be widely used in the temperature survey under multiple environment.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of described fibre optic temperature sensor thermometric process.
The described fibre optic temperature sensor that Fig. 2 is is 3.6mm by a radius-of-curvature, is placed on temperature field
In, along with temperature is from 20 degrees Celsius of transmission spectrum intensity that rise to 30 degrees Celsius of processes.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further described.
As shown in Figure 1, be the thermometric schematic diagram of described temperature sensor, comprise wideband light source (1), spectrometer (2), with the general single mode fiber (5) of coat, temperature field (3).Fibre optic temperature sensor is bent into droplet-like by one section of band coat single-mode fiber (5) without any processing, one section of semi-circular curved fiber can be thought in its most serious region of bending, its radius-of-curvature is got 2mm-6mm, then uses glue to locate to carry out adhering and solidifying in (4) and makes.This sensor is placed in temperature field (3), by wideband light source (1), provide incident light, can in spectrometer (2), observe interference illustration, during temperature variation in temperature field (3), in spectrometer (2), can observe interference peaks wavelength shift, illustrate that it has the ability of measuring temperature.
As shown in Figure 2, the described fibre optic temperature sensor that is 3.6mm by a curved fiber radius-of-curvature is put into constant temperature oven, when the temperature of constant temperature oven is warming up to the process of 30 degrees Celsius gradually with once stepping from 20 degrees Celsius, near the wavelength of the interference peaks of wavelength 1550nm floats to 1532.28nm gradually from 1553.32nm.In the illustration of Fig. 2, also shown in the time of 20 degrees Celsius the transmission spectrum of this sensor simultaneously.The drift condition of this interference peaks illustrates that the temperature control of this temperature sensor is greater than 2nm/ ℃.
It is based on following principle that the present invention realizes thermometric: in Fibre Optical Sensor, the effect of temperature on fiber is apart from outside thermo-optic effect, thermal expansion effects, and temperature also can affect the birefraction of optical fiber.Simultaneously when a section single-mould fiber is after serious bending, its inner index distribution is changed, thereby birefraction can be enhanced, with wideband light source, to inputting light in the single-mode fiber after serious bending, can with spectrometer, observe obvious interference fringe at its exit end, when temperature changes, because the birefraction in curved fiber changes thereupon, can show as the drift of interference peaks, by detecting the drift value of interference peaks, just can judge temperature variations.
The gordian technique that the present invention realizes temp sensing function is:
General single mode fiber can its inner index distribution by crooked change, thereby produce certain birefraction, yet general exposed single-mode fiber very easily fractures when being bent to certain curvature, so the birefraction causing is very limited, be not sufficient to cause the interference of two orthogonal modess in basement membrane.Yet the single-mode fiber with coat can be bent to below radius-of-curvature 2mm under the protection of coat, thereby produce the birefraction that enough causes interference.
By the single-mode fiber of one section of normal tape coat (as Corning, SMF-28) be bent into droplet-like, then the afterbody at bending optical fiber utilizes glue (as 502 glue) to be adhesively fixed optical fiber, one section of semi-circular curved fiber can be thought in its most serious region of bending, and its radius-of-curvature is got 2mm-6mm.Utilize the impact of temperature on the birefraction of curved fiber generation, by transmission spectrum is carried out to the information that wavelength-modulated obtains temperature, realize the measurement of environment temperature.
Described single-mode fiber is without any need for processing, just can form interferometer and for temperature sensing and there is higher temperature sensitivity.Manufacturing process is simple, and cost of manufacture is low, and the little and coat of sensor bulk can play the effect that protection sensor improves its structural stability, admittedly can be widely used in the temperature survey under multiple environment.
Claims (1)
1. an easy high sensitivity optical fiber temperature sensor, by one section of general single mode fiber with coat (as Corning, SMF-28) be bent into droplet-like, then the afterbody at curved fiber utilizes glue to be adhesively fixed optical fiber, the optical fiber that light is formed by simple bending through this section can produce and interfere at exit end, utilize the sensitivity of the birefraction of curved fiber to temperature, by transmission spectrum is carried out to the information that Wavelength demodulation obtains temperature, realize the measurement of environment temperature; Described glue can be common 502 glue, AB glue etc.;
Described curved fiber is the complete optical fiber with coat, is carried out comparatively violent bending, forms a droplet-like, and the most serious crooked part can be similar to regards one section of semi-circular optical fiber as, and its radius-of-curvature is 2mm-6mm, gummed partial-length >=50mm.
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| CN201310692158.5A CN103698048A (en) | 2013-12-09 | 2013-12-09 | Simple high-sensitivity optical-fiber temperature sensor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104655590A (en) * | 2015-02-10 | 2015-05-27 | 天津大学 | All-fiber refractive index and temperature sensor and measuring method |
| CN109687903A (en) * | 2018-12-28 | 2019-04-26 | 东南大学 | Optical fiber macrobending on-line monitoring system and method |
| CN112833928A (en) * | 2020-12-31 | 2021-05-25 | 桂林电子科技大学 | Cascade macrobend and alternative single mode-multimode fiber structure temperature refractive index sensor |
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| CN1975356A (en) * | 2005-11-21 | 2007-06-06 | 天津爱天光电子科技有限公司 | Packaging structural optical fiber grating sensor |
| GB2457903A (en) * | 2008-02-27 | 2009-09-02 | Dublin Inst Of Technology | Optical fibre temperature sensing device |
| CN201425524Y (en) * | 2009-02-17 | 2010-03-17 | 中国电子科技集团公司第二十三研究所 | Fiber bragg grating type temperature sensor |
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| CN102621099A (en) * | 2012-03-23 | 2012-08-01 | 暨南大学 | Micro-nano fiber refractivity sensor and preparation method thereof |
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2013
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| CN1975356A (en) * | 2005-11-21 | 2007-06-06 | 天津爱天光电子科技有限公司 | Packaging structural optical fiber grating sensor |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104655590A (en) * | 2015-02-10 | 2015-05-27 | 天津大学 | All-fiber refractive index and temperature sensor and measuring method |
| CN109687903A (en) * | 2018-12-28 | 2019-04-26 | 东南大学 | Optical fiber macrobending on-line monitoring system and method |
| CN109687903B (en) * | 2018-12-28 | 2021-09-28 | 东南大学 | Optical fiber macrobend on-line monitoring system and method |
| CN112833928A (en) * | 2020-12-31 | 2021-05-25 | 桂林电子科技大学 | Cascade macrobend and alternative single mode-multimode fiber structure temperature refractive index sensor |
| CN112833928B (en) * | 2020-12-31 | 2022-12-06 | 桂林电子科技大学 | Cascade macrobend and alternative single mode-multimode fiber structure temperature refractive index sensor |
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Application publication date: 20140402 |