CN203287311U - Double-cone fine-core single mode fiber based transmission-type optical fiber humidity sensor - Google Patents
Double-cone fine-core single mode fiber based transmission-type optical fiber humidity sensor Download PDFInfo
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- CN203287311U CN203287311U CN2013201654066U CN201320165406U CN203287311U CN 203287311 U CN203287311 U CN 203287311U CN 2013201654066 U CN2013201654066 U CN 2013201654066U CN 201320165406 U CN201320165406 U CN 201320165406U CN 203287311 U CN203287311 U CN 203287311U
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Abstract
The utility model discloses a double-cone fine-core single mode fiber based transmission-type optical fiber humidity sensor. The humidity sensor comprises a first single mode fiber (1), a double-cone fine-core single mode fiber (2), a second single mode fiber (2) and humidity sensitive films (4), wherein the humidity sensitive films (4) are coated on the cone waist surface of the double-cone fine-core single mode fiber (2); the first single mode fiber (1) and the second single mode fiber (3) are respectively connected with a wideband light source and an optical fiber spectrometer. According to the humidity sensor, the refracting index of the humidity sensitive films (4) changes with the environment humidity, and accordingly the transmitted spectrum characteristics of the sensor are changed; the environmental humidity value can be obtained according to the wavelength variation of characteristic peaks of the transmitted spectrum. The humidity sensor is simple in structure, low in cost, wide in measuring range and high in sensitivity, and overcomes the influence caused by instability of the light intensity by adopting a wavelength demodulation method, and meanwhile, is insensitive to the temperature. Therefore, the humidity sensor has stronger practicability.
Description
Technical field
The utility model relates to a kind of humidity sensor, relates in particular to a kind of transmission-type light fibre humidity transducer based on the thin core single-mode fiber of bicone.
Background technology
In a lot of occasions, the monitoring of humidity and measurement are very important, as food processing, chemistry manufacturing and synoptic weather observation etc.Traditional electronic type humidity sensor is based on the variation that detects resistance or electric capacity, exists the electricity leakage and cause measuring inaccurate shortcoming under high humidity environment.Than the electronic type humidity sensor, light fibre humidity transducer has lot of advantages, and is as little, lightweight in not being subjected to electromagnetic interference (EMI), size, and can be applicable to remote sensing survey etc.The light fibre humidity transducer of report is based on the optical fiber of special processing at present, as long-period gratings, Fiber Bragg Grating FBG, plastic optical fiber, photonic crystal fiber interferometer and conical fiber etc.Wu Qiang has proposed a kind of humidity sensor based on single mode-thin core single mode-single-mode fiber structure recently, this sensor consists of between two general single mode fibers the thin core single-mode fiber welding that a bit of surface scribbles the PEO humidity sensing film, have simple in structure, the advantage that cost is low.But this sensor only has higher sensitivity in the scope of humidity 75-85%, and sensitivity is lower outside this scope.Therefore, need to carry out transformation and optimization to the light fibre humidity transducer of this structure, make it all have very high measurement sensitivity in wider humidity range.
Summary of the invention
The narrow problem of the range of sensitivity for the humidity sensor that improves existing single mode-thin core single mode-single-mode fiber structure, the utility model is transformed on the basis of this structure, provide a kind of transmission-type light fibre humidity transducer based on the thin core single-mode fiber of bicone, this advantage that sensor preparation is simple, cost is low, the moisture measurement scope is wide and highly sensitive.
The technical scheme that its technical matters that solves the utility model adopts is: a kind of transmission-type light fibre humidity transducer based on the thin core single-mode fiber of bicone comprises the first single-mode fiber (1), the thin core single-mode fiber of bicone (2), the second single-mode fiber (3) and humidity sensing film (4) four parts., by thin core single-mode fiber is tapered processing, improves it and measure sensitivity and measurement range.The diameter of the middle cone waist portions of the thin core single-mode fiber of bicone (2) is not tapered the diameter of part less than two ends, and on the surface of its cone waist portions, scribbles humidity sensing film (4), and the refractive index of this sensitive membrane changes with the variation of external environment humidity.The thin core single-mode fiber of bicone (2) cladding diameter equates with the cladding diameter of the first single-mode fiber (1) and the second single-mode fiber (3), and its core diameter is less than the core diameter of the first single-mode fiber (1) and the second single-mode fiber (3).The first single-mode fiber (1), the thin core single-mode fiber of bicone (2), the second single-mode fiber (3) directly are welded together by optical fiber splicer, form " sandwich " structure of single mode-thin core single mode-single-mode fiber.During application, the first single-mode fiber (1), the second single-mode fiber (3) are connected with fiber spectrometer with wideband light source respectively.Determine the relative humidity of environment by the change amount of characteristic peak wavelength in the analyte sensors transmitted spectrum.
The beneficial effects of the utility model are, the characteristics that preparation is simple, cost is low, the moisture measurement scope is wide and highly sensitive, and insensitive to the temperature variation of environment.
Description of drawings
Below in conjunction with drawings and Examples, the utility model is further illustrated.
Accompanying drawing is structural representation of the present utility model.
In figure, 1 is the first single-mode fiber, and 2 is the thin core single-mode fiber of bicone, and 3 is the second single-mode fiber, and 4 is humidity sensing film.
Embodiment
Elaborate below in conjunction with structural principle of the present invention and principle of work:
Structural principle of the present invention is as follows:
In accompanying drawing, a kind of transmission-type light fibre humidity transducer based on the thin core single-mode fiber of bicone, with the first single-mode fiber (1) and thin core single-mode fiber, thin core single-mode fiber and the second single-mode fiber (3), utilize optical fiber splicer directly to be welded together, form " sandwich " structure of single mode-thin core single mode-single-mode fiber.Then the thin core single-mode fiber of centre is tapered processing, can utilize hydrofluorite corrosion or hot pull technology, prepare the thin core single-mode fiber (2) with bicone structure, coat humidity sensing film (4) on the cone waist surface of the thin core single-mode fiber of bicone (2) finally, as PEO or agarose etc.During application, the first single-mode fiber (1) is connected with fiber spectrometer with wideband light source respectively with the second single-mode fiber (3).
Principle of work of the present invention is as follows:
The light that wideband light source sends form with basic mode in the first single-mode fiber is propagated, fusion point at the first single-mode fiber and the thin core single-mode fiber of bicone, due to not mating of core diameter, part light injects the covering of the thin core single-mode fiber of bicone, excite the high-order cladding mode to transmit in covering, its effective refractive index is affected by the humidity sensing film refractive index, and the refractive index of humidity sensing film changes with the variation of ambient humidity; The fibre core of the thin core single-mode fiber of bicone is advanced in another part optically-coupled, with the form of basic mode, transmits in fine type, and its effective refractive index is not subjected to the impact of extraneous humidity.Two parts light, through the transmission of the thin core single-mode fiber of middle bicone, produces and interferes at the fusion point place of the thin core single-mode fiber of bicone and the second single-mode fiber, is coupled into the second single-mode fiber.Therefore this sensor can be equivalent to full optical fiber mach-Zehnder interferometer, and its reference arm and pickup arm be fibre core and the covering of the thin core single-mode fiber of corresponding bicone respectively.The variation of ambient humidity, cause the variations in refractive index of humidity sensing film, and then cause the transmitted spectrum characteristic of sensor to change., by the change amount of characteristic peak wavelength in fiber spectrometer survey sensor transmitted spectrum, can obtain the rh value of environment.The method of application Wavelength demodulation, overcome the unsettled impact of light source intensity.Thin-core fibers is tapered processing, make the diameter of cone waist portions than the parts of fine that is not tapered, can inspire the cladding mode of more more high-orders, and the effective refractive index of cladding mode is more responsive to the variation of humidity sensing film refractive index, thereby has improved detection sensitivity and the measurement range of sensor.From the above analysis, the sensitivity of sensor increases along with the length of the thin core single-mode fiber of bicone cone waist portions and reducing of diameter and increasing.On the other hand, for the thin core single-mode fiber of bicone part, the reference arm of equivalent Mach-Zehnder interferometer and pickup arm come from same optical fiber,, so this interferometer weakens temperature effectively to the interference that sensor causes, have advantages of temperature-insensitive.
Claims (3)
1. transmission-type light fibre humidity transducer based on the thin core single-mode fiber of bicone, it is characterized in that: comprise the first single-mode fiber (1), the thin core single-mode fiber of bicone (2) and the second single-mode fiber (3), the three directly is welded together by optical fiber splicer, form " sandwich " structure of single mode-thin core single mode-single-mode fiber, the cone waist portions surface of the thin core single-mode fiber of bicone (2) scribbles humidity sensing film (4), during application, the first single-mode fiber (1) is connected with fiber spectrometer with wideband light source respectively with the second single-mode fiber (3).
2. a kind of transmission-type light fibre humidity transducer based on the thin core single-mode fiber of bicone according to claim 1, it is characterized in that: the thin core single-mode fiber of described bicone (2) cladding diameter equates with the cladding diameter of the first single-mode fiber (1) and the second single-mode fiber (3), and its core diameter is less than the core diameter of the first single-mode fiber (1) and the second single-mode fiber (3).
3. a kind of transmission-type light fibre humidity transducer based on the thin core single-mode fiber of bicone according to claim 1, it is characterized in that: described thin core single-mode fiber has the bicone structure, the diameter that is the middle cone waist portions is not tapered the diameter of part less than two ends, and the surface in the cone waist portions scribbles humidity sensing film (4), and the refractive index of this sensitive membrane changes with the variation of external environment humidity.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013201654066U CN203287311U (en) | 2013-04-03 | 2013-04-03 | Double-cone fine-core single mode fiber based transmission-type optical fiber humidity sensor |
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| CN2013201654066U CN203287311U (en) | 2013-04-03 | 2013-04-03 | Double-cone fine-core single mode fiber based transmission-type optical fiber humidity sensor |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103822903A (en) * | 2014-03-10 | 2014-05-28 | 天津理工大学 | No-core fiber based relative air humidity measuring instrument |
| CN105738007A (en) * | 2016-02-03 | 2016-07-06 | 西安交通大学 | Biconical polymer optical fiber probe and preparation method thereof and temperature sensor |
| CN107271401A (en) * | 2017-07-28 | 2017-10-20 | 中国工程物理研究院激光聚变研究中心 | The molecular state organic pollutant monitoring sensor of small core single mode single-mode fiber structure is drawn based on single mode |
| CN107621447A (en) * | 2017-11-06 | 2018-01-23 | 中国计量大学 | A kind of optical fiber hypersensor of measurable liquid quality and humidity |
| CN107843758A (en) * | 2017-09-11 | 2018-03-27 | 南京森塞光电科技有限公司 | A kind of two die drawings cone fibre optic current sensor and preparation method |
| CN108318452A (en) * | 2018-03-26 | 2018-07-24 | 福建硅光通讯科技有限公司 | A kind of cone of intensity modulation type four light fibre humidity transducer |
| CN108398403A (en) * | 2018-03-26 | 2018-08-14 | 福建硅光通讯科技有限公司 | A kind of cone of wavelength modulation type four light fibre humidity transducer |
| CN109632712A (en) * | 2019-01-16 | 2019-04-16 | 北京信息科技大学 | The femtosecond direct write FBG temperature and refractive index measurement method of optical fiber tapered structure |
| CN110823808A (en) * | 2019-12-11 | 2020-02-21 | 南昌航空大学 | Tapered side-polished optical fiber biosensor and method for preparing tapered side-polished optical fiber |
| CN112764164A (en) * | 2021-01-28 | 2021-05-07 | 南开大学 | Optical fiber device, manufacturing method and optical fiber internal acoustic Mach-Zehnder interferometer |
| CN113376105A (en) * | 2021-07-15 | 2021-09-10 | 中南大学 | Optical fiber humidity sensor |
-
2013
- 2013-04-03 CN CN2013201654066U patent/CN203287311U/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103822903A (en) * | 2014-03-10 | 2014-05-28 | 天津理工大学 | No-core fiber based relative air humidity measuring instrument |
| CN105738007A (en) * | 2016-02-03 | 2016-07-06 | 西安交通大学 | Biconical polymer optical fiber probe and preparation method thereof and temperature sensor |
| CN107271401A (en) * | 2017-07-28 | 2017-10-20 | 中国工程物理研究院激光聚变研究中心 | The molecular state organic pollutant monitoring sensor of small core single mode single-mode fiber structure is drawn based on single mode |
| CN107843758A (en) * | 2017-09-11 | 2018-03-27 | 南京森塞光电科技有限公司 | A kind of two die drawings cone fibre optic current sensor and preparation method |
| CN107621447A (en) * | 2017-11-06 | 2018-01-23 | 中国计量大学 | A kind of optical fiber hypersensor of measurable liquid quality and humidity |
| CN107621447B (en) * | 2017-11-06 | 2023-10-13 | 中国计量大学 | Optical fiber ultrasensitive sensor capable of measuring liquid quality and humidity |
| CN108398403A (en) * | 2018-03-26 | 2018-08-14 | 福建硅光通讯科技有限公司 | A kind of cone of wavelength modulation type four light fibre humidity transducer |
| CN108318452A (en) * | 2018-03-26 | 2018-07-24 | 福建硅光通讯科技有限公司 | A kind of cone of intensity modulation type four light fibre humidity transducer |
| CN109632712A (en) * | 2019-01-16 | 2019-04-16 | 北京信息科技大学 | The femtosecond direct write FBG temperature and refractive index measurement method of optical fiber tapered structure |
| CN110823808A (en) * | 2019-12-11 | 2020-02-21 | 南昌航空大学 | Tapered side-polished optical fiber biosensor and method for preparing tapered side-polished optical fiber |
| CN110823808B (en) * | 2019-12-11 | 2023-01-24 | 南昌航空大学 | Tapered side-polished optical fiber biosensor and method for preparing tapered side-polished optical fiber |
| CN112764164A (en) * | 2021-01-28 | 2021-05-07 | 南开大学 | Optical fiber device, manufacturing method and optical fiber internal acoustic Mach-Zehnder interferometer |
| CN113376105A (en) * | 2021-07-15 | 2021-09-10 | 中南大学 | Optical fiber humidity sensor |
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Granted publication date: 20131113 Termination date: 20140403 |