CN1712916A - Fibre-optical couple temperature sensor of asymptotic wave with high sensitivity and production of pyrometric cone type sensing fibre-optical coupler - Google Patents
Fibre-optical couple temperature sensor of asymptotic wave with high sensitivity and production of pyrometric cone type sensing fibre-optical coupler Download PDFInfo
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- CN1712916A CN1712916A CN 200510026239 CN200510026239A CN1712916A CN 1712916 A CN1712916 A CN 1712916A CN 200510026239 CN200510026239 CN 200510026239 CN 200510026239 A CN200510026239 A CN 200510026239A CN 1712916 A CN1712916 A CN 1712916A
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Abstract
A temperature transducer of fibre - optical evanescent wave in high sensitivity consists of light source, detector and signal processing unit as detector probe is prepared by pyrometric cone type of fibre - optical coupler with one coupling fibre - optical pyrometric cone section connected to light source and one detector, another section to the other detector for varying output spectral ratio of coupler to obtain data of temperature change through conversion. The pyrometric cone type of fibre - optical coupler is prepared by melting two optical fibres and then drawing molten material to be cone form.
Description
Technical field:
The present invention addresses a kind of fibre optic temperature sensor and probe manufacture method thereof, the fine coupling mechanism manufacture method of particularly a kind of high sensitivity optical fiber coupled fadout degree temperature sensor and pyrometric cone type sensing thereof.
Background technology:
In recent years, sensor just towards highly sensitive, accuracy is high, adaptability is strong, small and exquisite and intelligentized direction develops.In this respect, extremely everybody favor of Fibre Optical Sensor.Optical fiber has that anti-electromagnetic interference (EMI) and atomic radiation, footpath are thin, in light weight, good insulating, excellent characteristic such as water-fast, corrosion-resistant, it not only is used for normal temperature survey, the more important thing is that it can be applicable to some special or rugged surrounding temperature measurements, as high pressure, forceful electric power magnetic, nuclear radiation etc.Its sensing ability is from the influence of temperature to the light wave propagated in optical fiber, and present fibre optic temperature sensor kind is a lot, mainly contains raman optical fibre temperature sensor, blackbody radiation temperature sensor, fiber-optical grating temperature sensor.External a lot of leading company and research institution have developed the fibre optic temperature sensor of above type, comprise APOLLO, BANNER, and LUSINO, and the newly developed company that cooperates with Fibercore etc.Domestic also have a lot of colleges and universities to do in this respect research, as Tsing-Hua University, Northern Transportation University, Nankai University, Wuhan science and engineering, Southeast China University or the like, than abroad, domestic for fibre optic temperature sensor mainly also in conceptual phase, commercialization is less.Existing fibre optic temperature sensor, structure are complicated, and be desirable not enough in antijamming capability, sensitivity.
Summary of the invention
The object of the present invention is to provide the fine coupling mechanism manufacture method of a kind of high sensitivity optical fiber coupled evanescent temperature sensor and pyrometric cone type sensing thereof, this fibre optic temperature sensor structure is simpler, have high anti-jamming capacity and high sensitivity, its probe is easily manufactured, and cost is low.
For achieving the above object, design of the present invention is:
A well behaved fibre optic temperature sensor should possess quick response and high-temperature resolution, and this also is the difficult point problem that temperature sensor is realized.The present invention starts with from sensor mechanism, has invented a kind of novel manifold type high sensitivity optical fiber couple temperature sensor of asymptotic wave, is intended to solve from the source difficult point problem of above-mentioned proposition.It utilizes fused-tapered fiber coupler as optical fiber evanescent wave temperature-sensing element based on the evanescent wave theory of light wave coupled wave theory and optical fiber, thus the evanescent wave that obtains having coupling effect.When surrounding the temperature variation in coupling mechanism sensing nose cone district, the evanescent wave in coupling mechanism awl district becomes the coupling effect of characteristic changing fiber coupler because of the temperature of covering medium, thereby the splitting ratio of coupling mechanism is changed, detect the parameter that splitting ratio just can obtain corresponding temperature like this.Owing to utilize coupling principle, the output signal of test is the splitting ratio of coupling mechanism, has nothing to do so it changes with the light intensity of light path, and very strong antijamming capability is arranged; Because the coupling effect of coupling mechanism is very responsive to temperature variation, so this sensor has very high measurement sensitivity.
According to above-mentioned design, the present invention adopts following technical proposals:
A kind of high sensitivity optical fiber coupled evanescent temperature sensor, comprise light source (1), detector (3,4) and signal processing unit (5), it is characterized in that adopting fused-tapered fiber coupler (2) as probe, the entrance point of a coupled fiber (20) the pyrometric cone section of fused-tapered fiber coupler (2) is connected a light source (1) and a detector (3) by optical fiber respectively with endpiece, and the entrance point of another root coupled fiber (25) pyrometric cone section is by disconnecting light source and endpiece connects another detector (4) by optical fiber; The delivery outlet of described two detectors (3,4) connects two entrance points of signal processing unit (5); Fused-tapered fiber coupler (2) is when surrounding the temperature variation of its pyrometric cone section, and respective change takes place its evanescent field thereupon, thereby changes the coupling effect of optical fiber coupling device, and the splitting ratio of fiber coupler is changed; Two detectors (3,4) convert the twice light signal of fiber coupler output to behind electric signal input signal processing unit (5), are converted by splitting ratio and obtain temperature information.
The structure of above-mentioned fused-tapered fiber coupler (2) is: the biconial coupling section that is become two fiber fuses by two coupled fibers (20,25) fused biconical taper, its two taper is with level and smooth arc-shaped transition, behind two coupled fibers (20,25) fused biconical taper, its fibre core (21,26) and covering (22,27) are drawn awl simultaneously but still keep two coverings (22,27) to encase separately fibre core (21,26), make two coupled fibers of fiber coupler (2) that entrance point and endpiece respectively be arranged; Be covered with temperature-sensitive material (28) at biconial coupling section skin, and make the cylindrical shape of profile, temperature-sensitive material (28) outside matcoveredn (29).
The biconial coupling section central cone district minimum diameter of above-mentioned fused-tapered fiber coupler (2) is 5～9 times of fibre core diameter, and the long more sensitivity of length of biconial coupling section is high more, and its tensile elongation is 5～35mm.
Fine coupling mechanism (2) manufacture method of a kind of above-mentioned pyrometric cone type sensing the steps include: the preheating simultaneously of (1) two two optical fiber, and for reducing stress, the pre-time will be grown, and is 2～5 seconds; (2) two superimposed slow fused biconical tapers of the optical fiber that preheating is good, draw awl speed for (30～75um) * 2/Sec, awl district's minimum diameter is 5～9 times of core diameter, its tensile elongation is 5～35mm.
The present invention compared with prior art, have following conspicuous outstanding substantive distinguishing features and remarkable advantage: adopt fused-tapered fiber coupler among the present invention as temp probe, temperature variation around its awl district sensing, change its coupling effect, the splitting ratio of its coupling mechanism is changed, thereby detect splitting ratio and obtain corresponding temperature parameter by signal processing unit processes by detecting device.Because to utilize coupling principle, output signal is the splitting ratio of coupling mechanism, it changes irrelevantly with the light intensity of light path, so very strong antijamming capability is arranged, its coupling effect is to the unusual sensitivity of temperature variation, so temperature sensor has very high sensitivity.Knot of the present invention is simple, and fused-tapered fiber coupler is easy to manufacture, and cost is low.The present invention is suitable for requirement and temperature is carried out is accurately measured or the occasion of control, numerous areas such as for example industry manufacturings, properties of product detection, environmental monitoring, biological spirit and scientific research, and can be in real time, temperature survey in high sensitivity.
Description of drawings
Fig. 1 is a theory diagram of the present invention.
Fig. 2 is the structural representation of the fine coupling mechanism of pyrometric cone type sensing.
Fig. 3 is the temperature and the splitting ratio corresponding relation curve map of testing the high sensitivity optical fiber coupled evanescent temperature sensor that records.
Embodiment
A preferred embodiment of the present invention accompanying drawings is as follows:
Referring to Fig. 1 and Fig. 2, this high sensitivity optical fiber coupled evanescent temperature sensor includes optical fiber 1, detector 3,4 and signal processing unit 5, adopt the fine coupling mechanism 2 of pyrometric cone type sensing as probe, detector 3,4 and signal processing unit 5, it is characterized in that adopting fused-tapered fiber coupler 2 as probe, the entrance point of coupled fiber 20 pyrometric cone sections of the fine coupling mechanism 2 of pyrometric cone type sensing is connected light source 1 and a detector 3 by optical fiber respectively with endpiece, and the entrance point of another root coupled fiber 25 pyrometric cone sections ends and disconnects light source and endpiece connects another detector 4 by optical fiber; The delivery outlet of described two detectors 3,4 connects two entrance points of signal processing unit 5; Fused-tapered fiber coupler 2 is when surrounding the temperature variation of its pyrometric cone section, and respective change takes place its evanescent field thereupon, thereby changes the coupling effect of optical fiber coupling device, and the splitting ratio of fiber coupler is changed; Two detectors 3,4 convert the twice light signal of fiber coupler output to behind electric signal input signal processing unit 5, are converted by splitting ratio and obtain temperature information.The structure of the fine coupling mechanism 2 of above-mentioned pyrometric cone type sensing is: the biconial coupling section that is become two fiber fuses by two coupled fibers, 20,25 fused biconical tapers, its two taper is with level and smooth arc-shaped transition, behind two coupled fiber 20,25 fused biconical tapers, its fibre core 21,26 and covering 22,27 drawn awl simultaneously but still keeps two coverings 22,27 to encase separately fibre core 21,26, makes two coupled fibers of fiber coupler 2 that entrance point and endpiece respectively be arranged; Be covered with temperature-sensitive material 28 at biconial coupling section skin, and make the cylindrical shape of profile, temperature-sensitive material 28 outside matcoveredns 29.The biconial coupling section central cone district minimum diameter of the fine coupling mechanism 2 of above-mentioned pyrometric cone type sensing is 5～9 times of fibre core diameter, and the long more sensitivity of length of biconial coupling section is high more, and its tensile elongation is 5～35mm.
The manufacture method of the fine coupling mechanism 2 of the pyrometric cone type sensing that this high sensitivity optical fiber coupled evanescent temperature sensor is used the steps include: the preheating simultaneously of (1) two two optical fiber, and for reducing stress, the pre-time will be grown, and is 2～5 seconds; (2) two superimposed slow fused biconical tapers of the optical fiber that preheating is good, draw awl speed for (30～75um) * 2/Sec, awl district's minimum diameter is 5～9 times of core diameter, its tensile elongation is 5～35mm.
The temperature that the actual measurement of this high sensitivity optical fiber coupled evanescent temperature sensor shown in Fig. 3 obtains is to splitting ratio corresponding relation curve.
Claims (4)
1. high sensitivity optical fiber coupled evanescent temperature sensor, comprise light source (1), detector (3,4) and signal processing unit (5), it is characterized in that adopting fused-tapered fiber coupler (2) as probe, the entrance point of a coupled fiber (20) the pyrometric cone section of fused-tapered fiber coupler (2) is connected a light source (1) and a detector (3) by optical fiber respectively with endpiece, and the entrance point of another root coupled fiber (25) pyrometric cone section is by disconnecting light source and endpiece connects another detector (4) by optical fiber; The delivery outlet of described two detectors (3,4) connects two entrance points of signal processing unit (5); Fused-tapered fiber coupler (2) is when surrounding the temperature variation of its pyrometric cone section, and respective change takes place its evanescent field thereupon, thereby changes the coupling effect of optical fiber coupling device, and the splitting ratio of fiber coupler is changed; Two detectors (3,4) become input signal processing unit (5) behind the electric signal with the two-beam conversion of signals of fiber coupler output, are converted by splitting ratio and obtain temperature information.
2. the high sensitivity optical fiber coupled Zhejiang according to claim 1 ripple temperature sensor that dies, the structure that it is characterized in that described fused-tapered fiber coupler (2) is: by two coupled fibers (20,25) fused biconical taper becomes the biconial coupling section of two fiber fuses, its two taper is with level and smooth arc-shaped transition, two coupled fibers (20,25) behind the fused biconical taper, its fibre core (21,26) and covering (22,27) while is drawn awl but still is kept two coverings (22,27) encase separately fibre core (21,26), make two coupled fibers of fiber coupler (2) that entrance point and endpiece respectively be arranged; Be covered with temperature-sensitive material (28) at biconial coupling section skin, and make the cylindrical shape of profile, temperature-sensitive material (28) outside matcoveredn (29).
3. high sensitivity optical fiber coupled evanescent temperature sensor according to claim 2, the biconial coupling section central cone district minimum diameter that it is characterized in that described fused-tapered fiber coupler (2) is 5～9 times of fibre core diameter, the long more sensitivity of length of biconial coupling section is high more, and its tensile elongation is 5～35mm.
4. the fused-tapered fiber coupler with the described high sensitivity optical fiber coupled evanescent temperature sensor of claim 1 (2) manufacture method the steps include: the preheating simultaneously of (1) two two optical fiber, and for reducing stress, the pre-time will be grown, and is 2～5 seconds; (2) two superimposed slow fused biconical tapers of the optical fiber that preheating is good, draw awl speed for (30～75um) * 2/Sec, awl district's minimum diameter is 5～9 times of core diameter, its tensile elongation is 5～35mm.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100507473C (en) * | 2006-09-22 | 2009-07-01 | 山东省科学院激光研究所 | Single-end optical fiber ring reflection type vibration and sonic sensor |
| CN103134533A (en) * | 2011-12-02 | 2013-06-05 | 西安金和光学科技有限公司 | Distributed optical fiber sensing device based on dual-channel and operation method thereof |
| CN105928465A (en) * | 2015-02-26 | 2016-09-07 | 柯尼卡美能达株式会社 | Strain sensor and method of measuring strain amount |
| CN108333144A (en) * | 2018-01-18 | 2018-07-27 | 桂林电子科技大学 | A kind of self-reference micron plastic optical fiber liquid refractive index sensor of coupled structure |
| CN110514287A (en) * | 2019-08-19 | 2019-11-29 | 南京邮电大学 | Based on single mode-less fundamental mode optical fibre coupler vibrating sensor |
| CN112414581A (en) * | 2020-11-06 | 2021-02-26 | 西安交通大学 | Temperature sensor based on multicore optic fibre |
| CN112595435A (en) * | 2020-12-14 | 2021-04-02 | 武汉理工大学 | High-sensitivity temperature measurement demodulation sensing system based on optical fiber strong evanescent field interferometer |
-
2005
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100507473C (en) * | 2006-09-22 | 2009-07-01 | 山东省科学院激光研究所 | Single-end optical fiber ring reflection type vibration and sonic sensor |
| CN103134533A (en) * | 2011-12-02 | 2013-06-05 | 西安金和光学科技有限公司 | Distributed optical fiber sensing device based on dual-channel and operation method thereof |
| WO2013079027A1 (en) * | 2011-12-02 | 2013-06-06 | 西安金和光学科技有限公司 | Distributed fibre sensing device based on dual channel and running method thereof |
| CN105928465A (en) * | 2015-02-26 | 2016-09-07 | 柯尼卡美能达株式会社 | Strain sensor and method of measuring strain amount |
| CN105928465B (en) * | 2015-02-26 | 2018-08-31 | 柯尼卡美能达株式会社 | Strain transducer and deflection assay method |
| CN108333144A (en) * | 2018-01-18 | 2018-07-27 | 桂林电子科技大学 | A kind of self-reference micron plastic optical fiber liquid refractive index sensor of coupled structure |
| CN110514287A (en) * | 2019-08-19 | 2019-11-29 | 南京邮电大学 | Based on single mode-less fundamental mode optical fibre coupler vibrating sensor |
| CN112414581A (en) * | 2020-11-06 | 2021-02-26 | 西安交通大学 | Temperature sensor based on multicore optic fibre |
| CN112595435A (en) * | 2020-12-14 | 2021-04-02 | 武汉理工大学 | High-sensitivity temperature measurement demodulation sensing system based on optical fiber strong evanescent field interferometer |
| CN112595435B (en) * | 2020-12-14 | 2023-01-13 | 武汉理工大学 | High-sensitivity temperature measurement demodulation sensing system based on optical fiber strong evanescent field interferometer |
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