CN103822903A - No-core fiber based relative air humidity measuring instrument - Google Patents
No-core fiber based relative air humidity measuring instrument Download PDFInfo
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- CN103822903A CN103822903A CN201410083910.0A CN201410083910A CN103822903A CN 103822903 A CN103822903 A CN 103822903A CN 201410083910 A CN201410083910 A CN 201410083910A CN 103822903 A CN103822903 A CN 103822903A
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Abstract
A no-core fiber based relative air humidity measuring instrument comprises a supercontinuum light source, single mode fiber, a spectrograph and a no-core fiber structure with a PVA (polyvinyl alcohol) film deposited on the surface, wherein the supercontinuum light source is connected with one end of the no-core fiber structure with the PVA film deposited on the surface through the single mode fiber, and the other end of the no-core fiber structure with the PVA film deposited on the surface is connected onto the spectrograph through the single mode fiber; and with humidity change, the refractive index of the PVA film of the no-core fiber structure with the PVA film deposited on the surface correspondingly changes, a harmonic peak of an interference spectrum drifts with humidity change, and the humidity information can be obtained by detecting change of the harmonic peak. The provided relative air humidity measuring instrument has the advantages of simple manufacturing process, low cost, high sensitivity, easiness in universal use and the like.
Description
Technical field
The invention belongs to relative air humidity Detection Techniques field, particularly relate to a kind of coreless fiber of humidity sensitive material that deposits as the relative air humidity tester of senser element.
Background technology
Humidity is the physical quantity that defines moisture in a broad sense.In industry, agricultural, biology and medical science, humidity is accurately measured, detected and control has great importance.Humidity sensor the earliest has psychrometer or hair hygrometer, but precision is not high, cannot meet the needs of modern development in science and technology.Traditional inductance type, resistance-type humidity sensor are subject to electromagnetic interference (EMI), are not suitable for being operated in the rugged surroundings of strong-electromagnetic field.
In recent years, along with the development of optical fiber sensing technology, light fibre humidity transducer is greatly paid close attention to and is widely used.Light fibre humidity transducer is all generally the variation that utilizes medium layer physicochemical property under the environment of humidity, and then causes that the variation of frequency, phase place etc. in light propagation detects humidity.Along with the excavation of new material and the infiltration of the intersection of new discipline, light fibre humidity transducer has broader application prospect.Existing humidity sensitive material has a variety of, and polyvinyl alcohol (PVA) (PVA) is exactly the one that can serve as good moisture-sensitive material, and it is a kind of pulverous macromolecule chemical material.The polyvinyl alcohol (PVA) of solution concentration 5% has good film forming and adhesive property, can be good at being coated in optical fiber surface.PVA coating expands after absorbing water vapor, and coating refractive index changes and has corresponding variation with humidity.
Coreless fiber is a kind of quartz fibre of the even material that is different from general single mode fiber.In use, itself serves as fibre core coreless fiber, and extraneous medium serves as covering and forms waveguide, and wherein the transmission mode characteristic of light in coreless fiber is directly related with the characteristic of extraneous medium.Such as single mode-centreless-single-mode fiber structure, the variations in refractive index of environment is very responsive especially to external world.This structure can be made real-time remarkable reaction continuously in external environment variations in refractive index, and has higher resolution.Its coreless fiber for the basic thought of refractive index sensing is: the light that waveguide occurs directly acts on mutually with external environment in coreless fiber, the variation of refractive index around makes the effective refractive index of guided mode produce respective change, and then affects the output characteristics of this structure.
The light fibre humidity transducer measurement of having reported at present exists that measurement range is little, sensitivity is not high, size is large, the response time is long and the shortcoming of complex process, in addition light fibre humidity transducer is subject to the impact of the conditions such as ambient temperature, stress, bending, in moisture measurement process, very easily introduce the interference that cannot predict, thereby greatly reduce the practical value of humidity sensor.Therefore require very high to measuring condition.
Summary of the invention
The object of the invention is to overcome above-mentioned the deficiencies in the prior art, a kind of relative air humidity measuring instrument based on coreless fiber is provided, the present invention is that the refractive index sensitivity characteristic good in conjunction with coreless fiber and the humidity of polyvinyl alcohol (PVA) cause the tunable characteristic of refractive index, the advantage such as that this measuring instrument has is simple in structure, highly sensitive, be not subject to electromagnetic interference (EMI), volume is little, has broad application prospects.Can realize the size detection to surrounding environment relative humidity.
Technical scheme of the present invention:
A relative air humidity measuring instrument based on coreless fiber, comprises the coreless fiber structure of Supercontinuum source, single-mode fiber, spectrometer, surface deposition PVA film.Described Supercontinuum source is connected with the coreless fiber structure of surface deposition PVA film by single-mode fiber, and the other end of the coreless fiber structure of surface deposition PVA film is connected on spectrometer by single-mode fiber.
The manufacturing process of the coreless fiber structure of described surface deposition PVA film is: after the surface of coreless fiber is cleaned in deionized water with ultrasound wave, in the PVA of 5% concentration solution, repeatedly dip, form the even PVA coating that 5 μ m are thick, then put into constant temperature oven and make the evaporation of coreless fiber coating moisture; The coreless fiber structure of described surface deposition PVA film is put into tested humidity environment.
The principle of work of the relative air humidity measuring instrument based on coreless fiber that the present invention makes:
The relative general single mode fiber of coreless fiber does not have covering, and extraneous medium just serves as the covering of coreless fiber.In the time that incident light enters coreless fiber by Single-Mode Fiber Coupling, a series of higher order modes can in coreless fiber, be excited.And these higher order modes interact while propagating, interfere phenomenon in coreless fiber.And these higher order modes to external world variation of medium refraction index will be very responsive, optical fiber transmission property refractive index is to external world very responsive.At one deck humidity sensing film of coreless fiber Surface Creation, along with the variation of external environment relative air humidity, the refractive index generation respective change of humidity sensing film, the harmonic peak of interference spectum can drift about along with the variation of humidity, just can obtain the relevant information of humidity by the variation of the harmonic peak that detects.
Advantage of the present invention and beneficial effect:
Relative humidity measurement instrument provided by the invention has that manufacture craft is simple, cost is low, highly sensitive, the advantage such as be easy to generally apply.
Accompanying drawing explanation
Fig. 1 is the schematic diagram that in the present invention, there is the coreless fiber of polyethylene coating on surface;
Fig. 2 is the structural representation of relative air humidity measuring instrument of the present invention;
In figure: 1. the fibre core of single-mode fiber, the 2. covering of single-mode fiber, 3. polyethylene coating, 4. coreless fiber, 5. Supercontinuum source, 6. there are the coreless fiber structure of polyethylene coating, 7. spectrometer, 8. single-mode fiber in surface.
Embodiment
For objects and advantages of the present invention are described better, below in conjunction with accompanying drawing and example, the invention will be further described.
As shown in Figure 2, the relative air humidity measuring instrument based on coreless fiber provided by the invention, comprises that the coreless fiber structure 6(that there is a polyethylene coating on Supercontinuum source 5, surface is as shown in Figure 1), spectrometer 7, single-mode fiber 8.Supercontinuum source 5 has the coreless fiber structure 6 of polyethylene coating to be connected by single-mode fiber 8 with surface, surface has the other end of the coreless fiber structure 6 of polyethylene coating to be connected on spectrometer 7 by single-mode fiber 8, and wherein surface has the coreless fiber structure 6 of polyethylene coating to be placed in tested humidity environment.
In the time that incident light is coupled into coreless fiber 4 by single-mode fiber 8, a series of higher order modes can in coreless fiber 4, be excited.And these higher order modes interact while propagating, interfere phenomenon in coreless fiber 4.Now these higher order modes to external world the variation of medium will be very responsive, optical fiber transmission property refractive index is to external world very responsive.At layer of polyethylene alcohol coating 3 humidity sensing films of coreless fiber 4 Surface Creations, polyethylene coating 3 humidity sensing films can be responded to the variation of external environment relative humidity, it is polyethylene coating 3 refractive index generation respective change in humidity environment, interference spectum can drift about along with the variation of humidity, is changed and just can be obtained humidity information by the interference spectum detecting.
In test process, the relative air humidity measuring instrument based on coreless fiber is fixed on to bracing frame and stretches with assurance.This enforcement has realized humidity sensitive material respective indices of refraction under humidity environment and has changed the application in relative humidity measurement in testing environment.
Claims (3)
1. the relative air humidity measuring instrument based on coreless fiber, is characterized in that, this measuring instrument comprises the coreless fiber structure of Supercontinuum source, single-mode fiber, spectrometer, surface deposition PVA film; Described Supercontinuum source is connected with the coreless fiber structure of surface deposition PVA film by single-mode fiber, and the other end of the coreless fiber structure of surface deposition PVA film is connected on spectrometer by single-mode fiber.
2. measuring instrument according to claim 1, it is characterized in that: the manufacturing process of the coreless fiber structure of described surface deposition PVA film is: by after the deionized water clean surface of the surface of coreless fiber, in the PVA of 5% concentration solution, repeatedly dip, form the even PVA coating that 5 μ m are thick, then put into constant temperature oven and make the evaporation of coreless fiber coating moisture.
3. measuring instrument according to claim 1, is characterized in that: the coreless fiber structure of described surface deposition PVA film is put into tested humidity environment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410083910.0A CN103822903A (en) | 2014-03-10 | 2014-03-10 | No-core fiber based relative air humidity measuring instrument |
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| CN201410083910.0A CN103822903A (en) | 2014-03-10 | 2014-03-10 | No-core fiber based relative air humidity measuring instrument |
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| CN103822903A true CN103822903A (en) | 2014-05-28 |
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| CN201410083910.0A Pending CN103822903A (en) | 2014-03-10 | 2014-03-10 | No-core fiber based relative air humidity measuring instrument |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104406573A (en) * | 2014-12-03 | 2015-03-11 | 北京交通大学 | Coreless optical fiber-based tilt angle sensor capable of discriminating direction |
| CN105675543A (en) * | 2016-03-17 | 2016-06-15 | 天津大学 | Air salinity monitoring method and device based on coreless optical fiber inner cavity sensing |
| CN106770044A (en) * | 2017-01-09 | 2017-05-31 | 中国计量大学 | A kind of index sensor of the thin core Michelson's interferometer based on PVA humidity-sensitive materials |
Citations (6)
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| DE3832185A1 (en) * | 1988-09-22 | 1990-03-29 | Fedor Dipl Phys Dr Mitschke | Humidity (moisture) sensor and measuring arrangement for the measurement of humidity |
| SU1711058A1 (en) * | 1989-11-03 | 1992-02-07 | Институт физики им.Б.И.Степанова | Multilayer moisture-sensitive element |
| CN201859117U (en) * | 2010-11-22 | 2011-06-08 | 中国计量学院 | Humidity sensor based on multimode interference SMS (single-mode multimode single-mode) optical fiber structure |
| CN203224446U (en) * | 2012-11-07 | 2013-10-02 | 中国计量学院 | Humidity sensor based on long-period fiber grating structure |
| CN203224440U (en) * | 2013-02-27 | 2013-10-02 | 中国计量学院 | Humidity sensor based on multimode interference MSM (multilayer switch module) structure |
| CN203287311U (en) * | 2013-04-03 | 2013-11-13 | 中国计量学院 | Double-cone fine-core single mode fiber based transmission-type optical fiber humidity sensor |
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2014
- 2014-03-10 CN CN201410083910.0A patent/CN103822903A/en active Pending
Patent Citations (6)
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|---|---|---|---|---|
| DE3832185A1 (en) * | 1988-09-22 | 1990-03-29 | Fedor Dipl Phys Dr Mitschke | Humidity (moisture) sensor and measuring arrangement for the measurement of humidity |
| SU1711058A1 (en) * | 1989-11-03 | 1992-02-07 | Институт физики им.Б.И.Степанова | Multilayer moisture-sensitive element |
| CN201859117U (en) * | 2010-11-22 | 2011-06-08 | 中国计量学院 | Humidity sensor based on multimode interference SMS (single-mode multimode single-mode) optical fiber structure |
| CN203224446U (en) * | 2012-11-07 | 2013-10-02 | 中国计量学院 | Humidity sensor based on long-period fiber grating structure |
| CN203224440U (en) * | 2013-02-27 | 2013-10-02 | 中国计量学院 | Humidity sensor based on multimode interference MSM (multilayer switch module) structure |
| CN203287311U (en) * | 2013-04-03 | 2013-11-13 | 中国计量学院 | Double-cone fine-core single mode fiber based transmission-type optical fiber humidity sensor |
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| 苗银萍等: "基于倾斜光纤光栅的相对湿度传感器", 《光电子激光》 * |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104406573A (en) * | 2014-12-03 | 2015-03-11 | 北京交通大学 | Coreless optical fiber-based tilt angle sensor capable of discriminating direction |
| CN105675543A (en) * | 2016-03-17 | 2016-06-15 | 天津大学 | Air salinity monitoring method and device based on coreless optical fiber inner cavity sensing |
| CN106770044A (en) * | 2017-01-09 | 2017-05-31 | 中国计量大学 | A kind of index sensor of the thin core Michelson's interferometer based on PVA humidity-sensitive materials |
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Application publication date: 20140528 |