CN101303299A - Air relative humidity measuring instrument based on inclined optical fiber grating - Google Patents
Air relative humidity measuring instrument based on inclined optical fiber grating Download PDFInfo
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- CN101303299A CN101303299A CNA2008100533424A CN200810053342A CN101303299A CN 101303299 A CN101303299 A CN 101303299A CN A2008100533424 A CNA2008100533424 A CN A2008100533424A CN 200810053342 A CN200810053342 A CN 200810053342A CN 101303299 A CN101303299 A CN 101303299A
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Abstract
The present invention discloses an inclined optical fiber raster based relative hygrometer for measuring relative humidity of air, which comprises a light source, single mode optical fibers, and an inclined optical fiber raster and an optical spectrum analyzer, wherein, the light source is connected through a single mode optical fiber to the inclined optical fiber raster, the output end of the inclined optical fiber raster is connected through a single mode optical fiber to the optical spectrum analyzer, and the inclined optical fiber raster is coated with a film made of a moisture sensitive material. The humidity sensitive material is polyimide material, or carbon-fiber composite material, or epoxy-phenolic resin moisture-sensitive material. The present invention incorporates the advantages of high moisture expansion linearity and stable chemical property of polyimide PI film, flexible design, high long term stability and exchangeability, and high response rate. In addition, the high temperature resistant, corrosion resistant, and optical fiber raster type sensor incorporates high measuring accuracy, miniature, interference resistance, and reusability, and is suitable for use in environmental extremes. Therefore, the present invention has advantages including low cost, simple construction, and easy implementation.
Description
Technical field
The present invention relates to a kind of relative air humidity measuring instrument.Particularly relate to inclined optical fiber grating that a kind of utilization is coated with humidity-sensitive material as senser element to external world environment carry out the relative air humidity measuring instrument based on inclined optical fiber grating of sensing.
Background technology
Fiber grating is a kind of novel photonic device, and it is the index distribution of a kind of space periodicity of setting up in optical fiber, can change and control the dissemination of light in optical fiber.Inclined optical fiber grating is to utilize the special system of writing method, in the fibre core of optical fiber, write with fiber axis to the grating that forms an angle, the light of particular range of wavelengths can be coupled to the fibre cladding from fiber core.And inclined optical fiber grating is a kind of grating grid face has certain angle of inclination with respect to fiber axis a short period fiber grating.In single-mode fiber, the inclination of grid face is strengthened core mode and the back coupling between the cladding mode of transmission of fl transmission, and the coupling between the core mode of transmission of the core mode of fl transmission and back is weakened, so two kinds of couplings are arranged; And the decay of the cladding mode of reverse transfer is very fast, can not observe in reflectance spectrum.Therefore, in transmission spectrum, there are core mode and a large amount of cladding modes to exist.
In existing technology, adopt Bragg grating or long period fiber grating to go to realize for the test of relative air humidity or the sensing of environment as sensing element, but, limited its range of application to a certain extent because they have concurrently than higher temperature cross sensitivity effect.And inclined optical fiber grating has avoided the shortcoming of the two to have the advantage of the two simultaneously.The scheme of inclined optical fiber grating sensor to signal sensing such as relative air humidity and analysis that adopt do not arranged at present as yet.
Inclined optical fiber grating is to the variation sensing sensitivity of temperature and strain, and it is relatively poor that humidity is changed susceptibility, and caused wavelength shift is very little, therefore, need be coated with the last layer humidity-sensitive material at the outside surface of optical fiber, increases the susceptibility that fiber grating changes humidity.According to fiber grating sense moor reason, when selecting humidity-sensitive material, its wet quick eigenwert must be the linear expansion amount.And different with thermal expansion, the relation of hygral expansion and water content will be measured in for a long time.So require the hygral expansion linearity good, induction humidity range is big, and operating temperature range is wide, and is highly sensitive, and the response time is short, and the humidity hysteresis return difference is little etc.
Summary of the invention
Technical matters to be solved by this invention is, provide inclined optical fiber grating that a kind of utilization is coated with humidity-sensitive material as senser element, can realize that the environment to external world of temperature influence not carries out the relative air humidity measuring instrument based on inclined optical fiber grating of sensing.
The technical solution adopted in the present invention is: a kind of relative air humidity measuring instrument based on inclined optical fiber grating, comprise light source, single-mode fiber, also be provided with inclined optical fiber grating and spectral analysis device, wherein, light source is connected with inclined optical fiber grating by single-mode fiber, and the output terminal of inclined optical fiber grating is connected with spectral analysis device by single-mode fiber, applies the humidity sensitive material membrane on the described inclined optical fiber grating.
Described humidity sensitive material adopts polyimide material or carbon fibre composite or epoxy-phenol an aromatic plant metioned in ancient books resin humidity-sensitive material.
Be to adopt spraying process on inclined optical fiber grating, to apply the humidity sensitive material that is dissolved in the volatile organic solvent, and by organic solvent volatilization film forming.
Described light source adopts wideband light source or narrow-band tunable light source.
The described inclined optical fiber grating that scribbles the humidity sensitive material membrane places tested humidity environment.
Relative air humidity measuring instrument based on inclined optical fiber grating of the present invention, with the inclined optical fiber grating is sensing element, can reflect the external environment situation according to core mode in its transmission spectrum and cladding mode resonant wavelength change, utilize its cladding mode and core mode to have similar temperature characterisitic and different stress sensitive characteristics, thereby by detecting the relative air humidity sensor of its variable quantity realization at interval based on the not temperature influence of inclined optical fiber grating.The hygral expansion linearity of this set of sensors polyimide PI film is good, stable chemical performance, have the outstanding advantage that flexible design, long-time stability and interchangeability are good, response speed is fast.High temperature resistant in addition, corrosion-resistant and grating type optical fiber sensor measurement precision height, miniaturization, anti-interference, characteristics such as easily multiplexing are adapted at working under the various rugged surroundings.Thereby the present invention has that cost is low, equipment is simple, the advantage that is easy to realize.
Description of drawings
Fig. 1 is an one-piece construction synoptic diagram of the present invention.
Wherein:
1: light source 2: inclined optical fiber grating
3: spectral analysis device 4: single-mode fiber
Embodiment
Below in conjunction with drawings and Examples the relative air humidity measuring instrument based on inclined optical fiber grating of the present invention is made a detailed description.
As shown in Figure 1, relative air humidity measuring instrument based on inclined optical fiber grating of the present invention, comprise light source 1, inclined optical fiber grating 2, spectral analysis device 3 and single-mode fiber 4, wherein, light source 1 is connected with inclined optical fiber grating 2 by single-mode fiber 4, the output terminal of inclined optical fiber grating 2 is connected with spectral analysis device 3 by single-mode fiber 4, applies the humidity sensitive material membrane on the described inclined optical fiber grating 2.The described inclined optical fiber grating 2 that scribbles the humidity sensitive material membrane places tested humidity environment.
Through the comparative analysis to tens of kinds of humidity-sensitive materials, selecting carbon fibre composite, epoxy-phenol an aromatic plant metioned in ancient books resin humidity-sensitive material and polyimide is that the humidity sensitive material membrane is more satisfactory.Humidity-sensitive material is dissolved in volatile organic solvent, adopt spraying process on inclined optical fiber grating 2, to apply the humidity sensitive material by the solvent evaporates film forming.
Described light source 1 adopts wideband light source or narrow-band tunable light source.
The test philosophy of the relative air humidity measuring instrument based on inclined optical fiber grating of the present invention is:
Adopting the service band of light source 1 is 1530～1570nm.The scope at cladding mode resonant peak is 1530nm～1559nm in the transmission spectrum of employing inclined optical fiber grating 2, and the resonance peak of core mode is 1561.5nm.Spectral analysis device 3 adopts the spectroanalysis instrument of Agilent.Single-mode fiber 4 adopts the single-mode fiber of C-band.
On inclined optical fiber grating, apply humidity sensitive material polyimide (PI) macromolecular material and be cured with spraying process.Respectively light source is linked to each other with the inclined optical fiber grating that is coated with the PI material with single-mode fiber, the inclined optical fiber grating that is coated with the PI material is inserted spectrometer, the inclined optical fiber grating that will be coated with the PI material then places the certain humidity environment, the PI macromolecular material has the hole of some, in the damp steam environment, water vapor is easy to be penetrated among the PI, and PI and water form hydrogen bond and combines, thereby fills the hole of humidity-sensitive material.Owing to linear expansion after this material moisture absorption is stretched, can be converted to the swell increment that hygral expansion causes the linear strain amount and handle.Promptly effect changes the TFBG constant to fiber grating by stress, and core mode and cladding mode resonance wavelength are drifted about, thereby the measurement of humidity is converted into measurement to the grating microstrain.Monitor the variation of transmission spectrum (wave length shift and amplitude) with spectrometer.Optimized its thickness and detected its structure and morphology and well be improved its moisture sensitivity through a large amount of experimental studies with atomic force microscope.Because we find that core mode and cladding mode have similar temperature sensitivity and different stress sensitive characteristics in to the research of inclined optical fiber grating, therefore our size that can change with extraneous humidity environment by the interval between cladding mode and the core mode in the transmission spectrum that detects inclined optical fiber grating, thus determine air humidity physical quantity in the environment.Be expected to obtain the not humidity sensor of temperature influence like this.
Claims (5)
1. relative air humidity measuring instrument based on inclined optical fiber grating, comprise light source (1), single-mode fiber (4), it is characterized in that, also be provided with inclined optical fiber grating (2) and spectral analysis device (3), wherein, light source (1) is connected with inclined optical fiber grating (2) by single-mode fiber (4), the output terminal of inclined optical fiber grating (2) is connected with spectral analysis device (3) by single-mode fiber (4), and described inclined optical fiber grating (2) is gone up and applied the humidity sensitive material membrane.
2. the relative air humidity measuring instrument based on inclined optical fiber grating according to claim 1 is characterized in that, described humidity sensitive material adopts polyimide material or carbon fibre composite or epoxy-phenol an aromatic plant metioned in ancient books resin humidity-sensitive material.
3. the relative air humidity measuring instrument based on inclined optical fiber grating according to claim 1, it is characterized in that, be to adopt spraying process to go up to apply the humidity sensitive material that is dissolved in the volatile organic solvent at inclined optical fiber grating (2), and by organic solvent volatilization film forming.
4. the relative air humidity measuring instrument based on inclined optical fiber grating according to claim 1 is characterized in that, described light source (1) adopts wideband light source or narrow-band tunable light source.
5. the relative air humidity measuring instrument based on inclined optical fiber grating according to claim 1 is characterized in that, the described inclined optical fiber grating (2) that scribbles the humidity sensitive material membrane places tested humidity environment.
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| CN2008100533424A CN101303299B (en) | 2008-05-30 | 2008-05-30 | Air relative humidity measuring instrument based on inclined optical fiber grating |
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| CN2008100533424A CN101303299B (en) | 2008-05-30 | 2008-05-30 | Air relative humidity measuring instrument based on inclined optical fiber grating |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101975997A (en) * | 2010-09-30 | 2011-02-16 | 华中科技大学 | Fiber bragg grating tuning method and device thereof |
| CN102095687A (en) * | 2011-01-18 | 2011-06-15 | 汉鼎信息科技股份有限公司 | Fiber grating humidity sensor using hydrogel as sensing element and manufacturing method thereof |
| CN102222818A (en) * | 2011-04-11 | 2011-10-19 | 浙江大学 | Novel coaxially structured optical fiber radio frequency antenna |
| CN102507449A (en) * | 2011-11-29 | 2012-06-20 | 中国计量学院 | Temperature-insensitive light source self-correcting humidity sensor based on TFBG (tilted fiber Bragg grating) |
| CN103472411A (en) * | 2013-10-10 | 2013-12-25 | 中南林业科技大学 | Magnetic field sensor based on Hybrid long-period fiber grating |
| CN104864999A (en) * | 2015-06-11 | 2015-08-26 | 毛嘉 | Tension sensor based on kagome fiber bragg grating |
| CN103196475B (en) * | 2013-03-23 | 2017-04-19 | 中南林业科技大学 | Hybrid fiber bragg grating sensing system for simultaneously measuring temperature, humidity and gas concentration |
| CN107064011A (en) * | 2017-02-09 | 2017-08-18 | 北京航天控制仪器研究所 | A kind of fiber bragg grating temperature sensor |
| CN107860408A (en) * | 2017-10-25 | 2018-03-30 | 南京大学 | A kind of detachable hygrometer based on FBG technologies |
| CN108254317A (en) * | 2018-01-30 | 2018-07-06 | 濮阳光电产业技术研究院 | A kind of fiber bragg grating temperature sensor in non-grid region coating polyimide |
| CN108844919A (en) * | 2018-04-25 | 2018-11-20 | 暨南大学 | The reflection type inclined fiber grating index sensor of covering and production, measurement method |
| CN110632123A (en) * | 2019-09-11 | 2019-12-31 | 中国科学院光电技术研究所 | Method for measuring wet expansion coefficient of flexible thin film diffraction lens |
| CN113075165A (en) * | 2021-03-18 | 2021-07-06 | 重庆理工大学 | U-shaped humidity-sensitive optical fiber sensor and manufacturing method thereof |
-
2008
- 2008-05-30 CN CN2008100533424A patent/CN101303299B/en not_active Expired - Fee Related
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101975997A (en) * | 2010-09-30 | 2011-02-16 | 华中科技大学 | Fiber bragg grating tuning method and device thereof |
| CN102095687A (en) * | 2011-01-18 | 2011-06-15 | 汉鼎信息科技股份有限公司 | Fiber grating humidity sensor using hydrogel as sensing element and manufacturing method thereof |
| CN102095687B (en) * | 2011-01-18 | 2012-05-30 | 汉鼎信息科技股份有限公司 | Fiber grating humidity sensor using hydrogel as sensing element and manufacturing method thereof |
| CN102222818A (en) * | 2011-04-11 | 2011-10-19 | 浙江大学 | Novel coaxially structured optical fiber radio frequency antenna |
| CN102222818B (en) * | 2011-04-11 | 2013-09-04 | 浙江大学 | Novel coaxially structured optical fiber radio frequency antenna |
| CN102507449A (en) * | 2011-11-29 | 2012-06-20 | 中国计量学院 | Temperature-insensitive light source self-correcting humidity sensor based on TFBG (tilted fiber Bragg grating) |
| CN103196475B (en) * | 2013-03-23 | 2017-04-19 | 中南林业科技大学 | Hybrid fiber bragg grating sensing system for simultaneously measuring temperature, humidity and gas concentration |
| CN103472411A (en) * | 2013-10-10 | 2013-12-25 | 中南林业科技大学 | Magnetic field sensor based on Hybrid long-period fiber grating |
| CN104864999A (en) * | 2015-06-11 | 2015-08-26 | 毛嘉 | Tension sensor based on kagome fiber bragg grating |
| CN107064011A (en) * | 2017-02-09 | 2017-08-18 | 北京航天控制仪器研究所 | A kind of fiber bragg grating temperature sensor |
| CN107064011B (en) * | 2017-02-09 | 2020-06-09 | 北京航天控制仪器研究所 | Fiber grating humidity sensor |
| CN107860408A (en) * | 2017-10-25 | 2018-03-30 | 南京大学 | A kind of detachable hygrometer based on FBG technologies |
| CN108254317A (en) * | 2018-01-30 | 2018-07-06 | 濮阳光电产业技术研究院 | A kind of fiber bragg grating temperature sensor in non-grid region coating polyimide |
| CN108844919A (en) * | 2018-04-25 | 2018-11-20 | 暨南大学 | The reflection type inclined fiber grating index sensor of covering and production, measurement method |
| CN108844919B (en) * | 2018-04-25 | 2020-11-13 | 暨南大学 | Cladding reflection type inclined fiber grating refractive index sensor and manufacturing and measuring methods thereof |
| CN110632123A (en) * | 2019-09-11 | 2019-12-31 | 中国科学院光电技术研究所 | Method for measuring wet expansion coefficient of flexible thin film diffraction lens |
| CN113075165A (en) * | 2021-03-18 | 2021-07-06 | 重庆理工大学 | U-shaped humidity-sensitive optical fiber sensor and manufacturing method thereof |
| CN113075165B (en) * | 2021-03-18 | 2022-10-18 | 重庆理工大学 | U-shaped humidity-sensitive optical fiber sensor and manufacturing method thereof |
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| CN101303299B (en) | 2010-06-09 |
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