CN102095687B - Fiber grating humidity sensor using hydrogel as sensing element and manufacturing method thereof - Google Patents
Fiber grating humidity sensor using hydrogel as sensing element and manufacturing method thereof Download PDFInfo
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Abstract
The invention relates to a fiber grating humidity sensor using hydrogel as a sensing element and a manufacturing method thereof. The fiber grating humidity sensor comprises a humidity sensing unit, a fixed bracket, a spring and a support cylinder. The concave fixed bracket is internally provided with a humidity sensing unit, a spring and a support cylinder; one end of the humidity sensing unit is fixed with one inner side wall of the fixed bracket; the other end of the humidity sensing unit is fixed with one end of the support cylinder; the other end of the support cylinder movably passes through the other inner side wall of the fixed bracket; the spring is sheathed on the support cylinder; one end of the spring is connected with the other end of the humidity sensing unit; and the other end of the spring is connected with the other inner side wall of the fixed bracket. Through the combination of hydrogel and fiber grating, the Bragg wavelength of the fiber grating is changed by using the volume of hydrogel to generate tensile force along with the humidity change of external environment so that the conversion of converting the humidity of the external environment to the wavelength offset of fiber grating is realized.
Description
Technical field
The present invention relates to the optical fiber grating sensing field, relate in particular to a kind of hydrogel and make fiber grating humidity sensor of sensitive element and preparation method thereof.
Background technology
Optical fiber can be used as the optical channel of transmission information, also can be used as sensor.Optical fiber sensing technology is to develop rapidly along with the development of Fibre Optical Communication Technology the seventies in 20th century, is characterized in the light wave being that carrier, optical fiber are medium, perception and transmit outer measuring-signal.Why optical fiber can be because its light beam parameters (such as amplitude, phase place, wavelength, frequency, polarization state etc.) has susceptibility to environmental factors such as temperature, pressure, electromagnetic field, vibration displacements as sensor.The advantage of Fibre Optical Sensor be non-conductive, in light weight, volume is little, high temperature resistant and electromagnetic radiation, flexible good, corrosion-resistant, these advantages make it be suitable for using under the rugged surroundings of inflammable, explosive, limited space and strong electromagnetic.Therefore, Fibre Optical Sensor receives great attention once coming out, and almost obtains research and application in every field, becomes the guide of modern sensor, is promoting the flourish of sensing technology.
Fiber-optic grating sensor is a wavelength-modulated type sensor.It is to wavelength sensitive and insensitive to light intensity.Therefore, the polarization and the loss of its fluctuation to light wave, light wave are insensitive.Fiber-optic grating sensor has linear response, is easy to integrated and inserts the little advantage of loss in addition.Make it can be used as multipath transmission, can be embedded in the measured material that be convenient to measure the internal stress and the temperature field of material, the invention of fiber-optic grating sensor is a major issue in light sensory field and optical fiber communication.The adaptable field of fiber-optic grating sensor comprises test of stress, temperature, pressure and strength of fluid or the like.And the application of its most worthy should be the stress and the temperature test of multiple spot multiparameter, can be applied in the composite inner damage check such as intellectual material.
Hydrogel may be defined as in water can swelling and keep large quantity of moisture and undissolvable cross-linked polymer.Hydrophilic micromolecule can spread in hydrogel, and hydrogel has excellent biological compatibility.Since the forties in 20th century, synthetic, the physicochemical property and very active of relevant hydrogel in Application for Field researchs such as biological chemistry, medical science.Macromolecule hydrogel can be expanded to an equilibrium state in water, be considered to a kind of biocompatible material.The water cut of macromolecule hydrogel depends on the macromolecule network structure, and environmental change responds to external world, and for example the humidity of external environment changes, salinity changes, potential of hydrogen changes or the like.So-called progress in Intelligent Hydrogel be meant to external irritant have reversible response, gel that can swelling in water.Because this type material is widely used high-technology fields such as its gentleness at molecular device, light control material, bioactivator, high efficiency separation to the reversible response of external irritant.
Summary of the invention
The objective of the invention is to overcome the deficiency of conventional art, provide a kind of hydrogel that uses to make fiber grating humidity sensor of sensitive element and preparation method thereof.
The technical scheme that technical solution problem of the present invention is taked is:
The fiber grating humidity sensor that hydrogel is made sensitive element comprises humidity sensitive unit, fixed mount, spring and support tube.
Be provided with humidity sensitive unit, spring and support tube in the fixed mount of matrix; A madial wall of humidity sensitive unit one end and fixed mount is fixed; One end of the humidity sensitive unit other end and support tube is fixed, and the other end of support tube runs through movable setting of another madial wall of fixed mount, is equipped with spring on the support tube; One end of spring is connected with the humidity sensitive unit other end, and the other end of spring is connected with another madial wall of fixed mount.
Described humidity sensitive unit comprises fiber grating, first fixed disc, second fixed disc and hydrogel; Be provided with fiber grating between first fixed disc and second fixed disc; Fiber grating is coated by hydrogel, and hydrogel and fiber grating constitute the sensor in the humidity sensitive unit; The optical fiber of fiber grating one side extends to the external world after passing a madial wall of first fixed disc and fixed mount successively, and the optical fiber of fiber grating opposite side extends to the external world after passing another madial wall of second fixed disc, support tube and fixed mount successively.
The coaxial setting of described humidity sensitive unit and support tube.
The method for making of sensor comprises the steps:
Earlier a single-mode fiber is peeled off the protective seam of outside, and be placed on 110～140Mpa, 130～150 ℃ condition was downloaded hydrogen 48 hours.Utilize the KrF laser instrument of wavelength, utilize the phase mask method to inscribe fiber grating for 248nm.The fiber grating of finishing writing was annealed 24 hours under 130～150 ℃ of conditions, drove the hydrogen that remains in the optical fiber out of.Then two clips are fixed on the two ends of grating.In order to improve the sensitivity of sensor, adopt hydrofluorite corrosion grating to reduce the cross-sectional area of grating, then it is synthesized in the gel covering.The synthetic monomer that is adopted of gel is acrylamide, and crosslinking chemical is N, N '-methylene bisacrylamide.Must above two kinds of reagent are refining, purification during use.Ultraviolet initiator is ketoglutaric acid.Mass ratio by monomer, crosslinking chemical, ultraviolet initiator is after 86:12:2 configures gel solution, and irradiation is 3-4 hour under uviol lamp, and gel can synthesize.
Beneficial effect of the present invention: the present invention combines through hydrogel and fiber grating; Utilize the hydrogel volume to produce tension force and change the fiber grating bragg wavelength with the variation of external environment condition humidity; Realized external environment humidity is transferred to the conversion between the optic fiber grating wavelength side-play amount, thereby realized that the humidity of environment to external world carries out the purpose of sensing.With hydrofluorite fiber grating is corroded to reduce the cross-sectional area of grating further, improved the sensitivity of sensor effectively and enlarged its tuning range.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is the polyplant synoptic diagram of gel among the present invention.
Fig. 3 uses synoptic diagram for the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.
Principle of the present invention is: when hydrogel is in the wet environment, and hydrogel suction volumetric expansion, the fiber grating that is embedded in the hydrogel produces mechanical stretching because hydrogel expands, and also just change is greatly for the fiber grating Bragg period.When sensor was placed in the dry environment, gel can discharge moisture and shrink.Because the tension force of in fiber grating, introducing when hydrogel expands is along with the contraction of gel then can cause fiber grating and then to shrink, the bragg wavelength of fiber grating also can reduce so.Because the size of the contraction of hydrogel depends on the humidity of environment, promptly the humidity of environment is big more, and the expansion of gel is big more, and then bragg wavelength will be bigger.Therefore, the amount of movement of the bragg wavelength of fiber grating is just directly relevant with the humidity of environment.Detection fiber grating reflection or transmission peak wavelength can obtain heat transfer agent.Because the power of the expansion of gel is less, the variation of bragg wavelength is also just very little.In order to improve the sensitivity of sensor, employing hydrofluorite corrosion optical fiber grating reduces the cross-sectional area of fiber grating covering, the sensitivity that can improve this sensor greatly.
With reference to Fig. 1, the fiber grating humidity sensor that hydrogel is made sensitive element comprises humidity sensitive unit, fixed mount 2, spring 7 and support tube 8.
Be provided with humidity sensitive unit, spring and support tube in the fixed mount of matrix; A madial wall of humidity sensitive unit one end and fixed mount is fixed; One end of the humidity sensitive unit other end and support tube is fixed, and the other end of support tube runs through movable setting of another madial wall of fixed mount, is equipped with spring on the support tube; One end of spring is connected with the humidity sensitive unit other end, and the other end of spring is connected with another madial wall of fixed mount;
The humidity sensitive unit comprises fiber grating 5, first fixed disc 3, second fixed disc 6 and hydrogel 4; Be provided with fiber grating between first fixed disc and second fixed disc; Fiber grating is coated by hydrogel, and hydrogel and fiber grating constitute the sensor in the humidity sensitive unit; The optical fiber 1 of fiber grating one side extends to the external world after passing a madial wall of first fixed disc and fixed mount successively, and the optical fiber of fiber grating opposite side extends to the external world after passing another madial wall of second fixed disc, support tube and fixed mount successively.
The coaxial setting of humidity sensitive unit and support tube.
Wherein the method for making of sensor comprises the steps: earlier a single-mode fiber (for example, healthy and free from worry SMF28) to be peeled off the protective seam of outside, and is placed on 110～140Mpa, and 130～150 ℃ condition was downloaded hydrogen 48 hours.Use the KrF laser instrument of wavelength, adopt the phase mask method to inscribe fiber grating as 248nm.The fiber grating that obtains was annealed 24 hours under 130～150 ℃ of conditions, drove the hydrogen that remains in the optical fiber out of.Then two clips are fixed on the two ends of grating.In order to improve the sensitivity of sensor, adopt hydrofluorite corrosion grating to reduce the cross-sectional area of grating, then it is synthesized in the gel covering.
With reference to figure 2; In order to improve the sensitivity of sensor, avoid the sensitivity of fiber grating to bending, make gel act on the grating better; The fiber grating that will pass through hydrofluorite corrosion is separately fixed at first fixed disc and second fixed disc at the two ends of grating after cleaning.The glass tube 10 that fiber grating is put into a both ends open joins glass tube with the gel solution that configures 11 from conduit then, till filling, and first rubber stopper 9 and second rubber stopper 12 beyond the Great Wall respectively at the glass tube two ends then.Rubber stopper is opened an aperture makes optical fiber 9 be connected to the external world.Then gel solution is polymerization behind the UV-irradiation of 365nm at wavelength.
With reference to figure 3; The light that wideband light source 13 sends is connected to the input end of humidity sensitive unit 15 through optical fiber 14; The output terminal of humidity sensitive unit 15 is through the input end of optical fiber 14 connection spectroanalysis instruments 16, and the data-out port of spectroanalysis instrument 16 is connected to data acquisition system (DAS) 17.During system works; When the sensing environmental change of humidity sensitive unit (variation of ambient humidity); Can cause that the optical spectrum that is input to spectroanalysis instrument changes, spectroanalysis instrument sends to the data acquisition system (DAS) analysis with the spectral information that collects, and calculates the humidity of environment.
Claims (1)
1. hydrogel is made the fiber grating humidity sensor of sensitive element; Comprise humidity sensitive unit, fixed mount, spring and support tube; It is characterized in that: be provided with humidity sensitive unit, spring and support tube in the fixed mount of matrix, a madial wall of humidity sensitive unit one end and fixed mount is fixed, and an end of the humidity sensitive unit other end and support tube is fixed; The other end of support tube runs through movable setting of another madial wall of fixed mount; Be equipped with spring on the support tube, an end of spring is connected with the humidity sensitive unit other end, and the other end of spring is connected with another madial wall of fixed mount;
Described humidity sensitive unit comprises fiber grating, first fixed disc, second fixed disc and hydrogel; Be provided with fiber grating between first fixed disc and second fixed disc; Fiber grating is coated by hydrogel, and hydrogel and fiber grating constitute the sensor in the humidity sensitive unit; The optical fiber of fiber grating one side extends to the external world after passing a madial wall of first fixed disc and fixed mount successively, and the optical fiber of fiber grating opposite side extends to the external world after passing another madial wall of second fixed disc, support tube and fixed mount successively;
The coaxial setting of described humidity sensitive unit and support tube.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20150117157A1 (en) * | 2013-10-31 | 2015-04-30 | King Abdullah University Of Science And Technology | Integrated passive and wireless sensor |
Families Citing this family (9)
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| CN102393359A (en) * | 2011-10-18 | 2012-03-28 | 大连理工大学 | Fiber bragg grating temperature sensor |
| CN104198395B (en) * | 2014-09-15 | 2016-08-17 | 西安科技大学 | A kind of two-way tractive fiber bragg grating temperature sensor |
| CN105259139A (en) * | 2015-10-22 | 2016-01-20 | 中国计量学院 | Tilted fiber bragg grating humidity sensor based on oxidized graphene and agarose composite film |
| CN106643911B (en) * | 2017-02-09 | 2019-02-15 | 北京航天控制仪器研究所 | A kind of fiber grating Temperature Humidity Sensor encapsulating structure |
| CN108896482A (en) * | 2018-06-25 | 2018-11-27 | 河南工业大学 | A kind of fiber grating pH sensor and preparation method thereof based on graphene intelligent aqueous gel |
| CN110082314B (en) * | 2019-04-29 | 2021-08-03 | 南京理工大学 | Solution concentration measuring system and method based on non-coating type hydrogel fiber bragg grating |
| CN113171091B (en) * | 2021-04-22 | 2023-03-21 | 北京航空航天大学 | Implantable hydrogel fiber bragg grating glucose sensor, preparation method and measurement system |
| CN114812886B (en) * | 2022-04-29 | 2022-12-13 | 威海长和光导科技有限公司 | Intelligent hydrogel optical fiber sensor and preparation device and preparation method thereof |
| CN115371542A (en) * | 2022-09-29 | 2022-11-22 | 四川大学 | Resistance strain gauge based on environment response type intelligent gel, detection device and environment stimulus factor level detection method |
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