CN111595793A - Humidity sensor and system based on optical fiber micro-nano structure - Google Patents
Humidity sensor and system based on optical fiber micro-nano structure Download PDFInfo
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- CN111595793A CN111595793A CN202010640040.8A CN202010640040A CN111595793A CN 111595793 A CN111595793 A CN 111595793A CN 202010640040 A CN202010640040 A CN 202010640040A CN 111595793 A CN111595793 A CN 111595793A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/08—Optical fibres; light guides
- G01N2201/088—Using a sensor fibre
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Abstract
The invention relates to a humidity sensor and a system based on an optical fiber micro-nano structure, and mainly relates to the field of humidity measurement. The humidity sensor provided by the present application includes: optical fiber, metal receive structure layer and oxidation graphite alkene layer a little, on light incides this metal receive structure layer a little through optical fiber, when the ambient humidity near this oxidation graphite alkene layer changes, this oxidation graphite alkene layer's refracting index also changes, influence the propagation of the inside light of this optical fiber, and then make light pass this metal receive the transmission spectrum that the structure layer produced a little also changes, the spectrum through the emergent light to this optical fiber detects, and obtain this oxidation graphite alkene layer's refracting index change condition according to the change of spectrum and the corresponding relation of oxidation graphite alkene layer refracting index, and the change relation of refracting index through oxidation graphite alkene layer and ambient humidity, obtain this oxidation graphite alkene layer surrounding environment humidity.
Description
Technical Field
The invention relates to the field of humidity measurement, and mainly relates to a humidity sensor and system based on an optical fiber micro-nano structure.
Background
Humidity represents a physical quantity of the dryness of an object. The less water vapor contained in a certain volume of air at a certain temperature, the drier the air; the more water vapor, the more humid the air. The degree of dryness of air is called "humidity". In this sense, the physical quantities such as absolute humidity, relative humidity, comparative humidity, mixture ratio, saturation difference, and dew point are commonly used; if the weight of water vapor in the wet steam is expressed as a percentage of the total weight (volume) of the steam, it is referred to as the humidity of the steam.
In the prior art, a humidity measuring device is generally adopted for measuring humidity, and the general humidity measuring device comprises a resistance type and a capacitance type, and a humidity sensitive resistor is characterized in that a substrate is covered with a layer of film made of a humidity sensitive material, when water vapor in an object is adsorbed on the humidity sensitive film, the resistivity and the resistance of an element are changed, and the humidity can be measured by utilizing the characteristic. The humidity sensitive capacitor is generally made of a polymer film capacitor, and the commonly used polymer materials include polystyrene, polyimide, acetate butyrate and the like. When the environmental humidity changes, the dielectric constant of the humidity sensitive capacitor changes, so that the capacitance of the humidity sensitive capacitor also changes, and the capacitance change quantity of the humidity sensitive capacitor is in direct proportion to the relative humidity.
However, the electronic components used for measuring humidity are rusted due to the influence of moisture after the electronic components measure humidity for a period of time, so that the service life of the electronic components for measuring humidity is short, and the measurement accuracy of the electronic components after being rusted is reduced.
Disclosure of Invention
The invention aims to provide a humidity sensor and a system based on an optical fiber micro-nano structure aiming at the defects in the prior art, so as to solve the problems that electronic elements are adopted in the prior art for measuring humidity, and after the electronic elements measure humidity for a period of time, the electronic elements are corroded due to the influence of moisture, so that the service life of the electronic elements for measuring humidity is short, and the measuring accuracy of the electronic elements is reduced after the electronic elements are corroded.
In order to achieve the above purpose, the embodiment of the present invention adopts the following technical solutions:
in a first aspect, the present application provides a humidity sensor based on an optical fiber micro-nano structure, the humidity sensor includes: the optical fiber comprises an optical fiber, a metal micro-nano structure layer and a graphene oxide layer, wherein a surface covering layer is removed from one section of the optical fiber, the metal micro-nano structure layer is an array in which metal micro-nano units are periodically arranged, the metal micro-nano structure layer is obliquely arranged inside a fiber core of the optical fiber, and the graphene oxide layer is coated on the surface of one section of the fiber core of the optical fiber with the covering layer removed.
Optionally, the metal micro-nano unit is an "L" -shaped metal micro-nano unit or an "h" -shaped metal micro-nano unit.
Optionally, the number of the metal micro-nano structure layers is multiple.
Optionally, the humidity sensor further comprises a chiral molecular layer, and the chiral molecular layer is arranged between the multiple metal micro-nano structure layers.
Optionally, the surface of the graphene oxide layer is provided with a plurality of protruding structures.
Optionally, the optical fiber is a single mode fiber or a multimode fiber.
In a second aspect, the present application provides a humidity sensing system based on an optical fiber micro-nano structure, the humidity sensing system comprising: the humidity sensor comprises a light source, a detector and the humidity sensor of any one of the first aspect, wherein the light source and the detector are respectively arranged at two ends of an optical fiber of the humidity sensor, the light source is used for generating and sending light, and the detector is used for detecting the transmission spectrum of emergent light of the optical fiber.
Optionally, the light source is a laser light source.
Optionally, the detector is a spectrometer.
The invention has the beneficial effects that:
the humidity sensor provided by the present application includes: the optical fiber comprises an optical fiber, a metal micro-nano structure layer and a graphene oxide layer, wherein a surface covering layer is removed from one section of the optical fiber, the metal micro-nano structure layer is an array in which metal micro-nano units are periodically arranged, the metal micro-nano structure layer is obliquely arranged in an optical fiber core, the graphene oxide layer is coated on one section of surface of the optical fiber with the surface covering layer removed, the graphene oxide layer is a two-dimensional material, has a large surface area and outstanding hydrophilicity, and further has a refractive index which is remarkably changed along with the change of humidity, when light is incident on the metal micro-nano structure layer through the optical fiber, when the environmental humidity near the graphene oxide layer is changed, the refractive index of the graphene oxide layer is also changed, so that the propagation of light rays in the optical fiber is influenced, further, the transmission spectrum generated when the light passes through the, and the refractive index change condition of this oxidation graphite alkene layer is obtained according to the change of spectrum and the corresponding relation of oxidation graphite alkene layer refracting index, and the change relation through the refractive index of oxidation graphite alkene layer and ambient humidity, obtain this oxidation graphite alkene layer surrounding environment humidity, this application adopts optical fiber sensor to measure humidity, avoid electronic component contact moisture, reduce the chance that electronic component produced the corrosion, prolong this humidity transducer's life, and because this application is for turning into the transmission spectrum change with the change of humidity, make the measurement accuracy to humidity higher.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a humidity sensor according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of another humidity sensor according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another humidity sensor according to an embodiment of the present invention.
Icon: 10 an optical fiber; 20-a graphene oxide layer; 30-a metal micro-nano structure layer; 40-a layer of chiral molecules; 50-raised structure.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiment is a metal plate embodiment of the present invention, and not all embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In order to make the implementation of the present invention clearer, the following detailed description is made with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a humidity sensor according to an embodiment of the present invention; as shown in fig. 1, the present application provides a humidity sensor based on an optical fiber micro-nano structure, and the humidity sensor includes: the optical fiber comprises an optical fiber 10, a metal micro-nano structure layer 30 and a graphene oxide layer 20, wherein a surface covering layer is removed from one section of the optical fiber 10, the metal micro-nano structure layer 30 is an array in which metal micro-nano units are periodically arranged, the metal micro-nano structure layer 30 is obliquely arranged inside a fiber core of the optical fiber 10, and the graphene oxide layer 20 is coated on the surface of one section of the fiber core of the optical fiber 10 from which the covering layer is.
The length and the diameter of the optical fiber 10 are selected according to actual needs, no specific limitation is made herein, a section of the optical fiber 10 is selected, a covering layer coated on the section selected by the fiber core of the optical fiber 10 is removed, the length of the selected end is selected according to actual conditions, no specific limitation is made herein, a metal micro-nano structure layer 30 is arranged inside the optical fiber 10 of the section of the optical fiber 10 from which the covering layer is removed, the metal micro-nano structure layer 30 is an array formed by periodically arranging metal micro-nano units, the number of the metal micro-nano units in the metal micro-nano structure layer 30 is set according to actual needs, no specific limitation is made herein, as the graphene oxide layer 20 is a two-dimensional material, the surface area is large, the hydrophilicity is prominent, and further the refractive index of the graphene oxide layer 20 changes remarkably with the change of humidity, when light is incident on the metal micro-nano structure layer, when the environmental humidity near the graphene oxide layer 20 changes, the refractive index of the graphene oxide layer 20 also changes, which affects the propagation of light inside the optical fiber 10, so that the transmission spectrum generated when light passes through the metal micro-nano structure layer 30 also changes, the spectrum of emergent light of the optical fiber 10 is detected, the refractive index change condition of the graphene oxide layer 20 is obtained according to the corresponding relation between the change of the spectrum and the refractive index of the graphene oxide layer 20, and the environmental humidity around the graphene oxide layer 20 is obtained through the change relation between the refractive index of the graphene oxide layer 20 and the environmental humidity, the application adopts the optical fiber 10 sensor to measure the humidity, avoids the contact of electronic elements with moisture, reduces the chance of corrosion of the electronic elements, prolongs the service life of the humidity sensor, and because the application converts the change of the humidity into the transmission spectrum change, the measurement accuracy of humidity is higher, it should be noted that the corresponding relation between the change of the spectrum and the refractive index of the graphene oxide layer 20 and the change relation between the refractive index of the graphene oxide layer 20 and the environmental humidity are obtained according to laboratory measurement, and no specific limitation is made here, in addition, the graphene oxide layer 20 can change the refractive index of itself according to the change of humidity, the coating layer protection optical fiber 10 of the matrix optical fiber 10 can be further provided, the metal micro-nano structure layer 30 is obliquely arranged, the area of the metal micro-nano structure layer 30 for receiving light is increased, and the vibration effect between incident light and the metal micro-nano structure layer 30 is increased.
Optionally, the metal micro-nano unit is an "L" -shaped metal micro-nano unit or an "h" -shaped metal micro-nano unit.
The metal micro-nano unit can be an L-shaped metal micro-nano unit, an h-shaped metal micro-nano unit, a metal micro-nano structure layer 30 formed by a plurality of L-shaped metal micro-nano units or h-shaped metal micro-nano units.
Optionally, the number of the metal micro-nano structure layers 30 is multiple.
The metal micro-nano structure layer 30 may be a plurality of layers, and a plurality of metal micro-nano structure layers 30 are arranged in parallel and are all inclined to the extending direction of the optical fiber 10.
FIG. 2 is a schematic diagram of another humidity sensor according to an embodiment of the present invention; as shown in fig. 2, optionally, the humidity sensor further includes a chiral molecular layer 40, and the chiral molecular layer 40 is disposed between the plurality of metal micro-nano structure layers 30.
A chiral molecular layer 40 is arranged between the multiple metal micro-nano structure layers 30, the material of the chiral molecular layer 40 is a chiral molecular material, the surface area of the chiral molecular layer 40 is generally equal to that of the metal micro-nano structure layer 30, and the chiral molecular layer 40 increases the resonance between light and the metal micro-nano structure layer 30, so that the spectral signal change of the metal micro-nano structure layer 30 is more obvious.
Fig. 3 is a schematic structural diagram of another humidity sensor according to an embodiment of the present invention, and as shown in fig. 3, a plurality of protruding structures 50 are optionally disposed on a surface of the graphene oxide layer 20.
This graphene oxide layer 20's surface sets up a plurality of protruding structures 50, can be the equal protruding shape in graphene oxide layer 20 surface, can be this graphene oxide layer 20 surface sets up a plurality of protruding structures 50, protruding structure 50 increases this humidity transducer and surrounding environment's area of contact, further improves this humidity transducer to the detectivity of surrounding environment humidity.
Optionally, the optical fiber 10 is a single mode optical fiber 10 or a multimode optical fiber 10.
The optical fiber 10 may be a single mode optical fiber 10, or may be a multimode optical fiber 10, and is selected according to actual needs, and is not specifically limited herein.
The humidity sensor provided by the present application includes: the optical fiber 10, the metal micro-nano structure layer 30 and the graphene oxide layer 20, wherein a section of the optical fiber 10 is provided with a surface covering layer, the metal micro-nano structure layer 30 is an array in which metal micro-nano units are periodically arranged, the metal micro-nano structure layer 30 is obliquely arranged inside a fiber core of the optical fiber 10, the graphene oxide layer 20 is coated on a section of surface of the optical fiber 10 with the surface covering layer removed, because the graphene oxide layer 20 is a two-dimensional material, the surface area is large, the hydrophilicity is outstanding, the change of the refractive index of the graphene oxide layer 20 along with the change of humidity is obvious, when light is incident on the metal micro-nano structure layer 30 through the optical fiber 10, when the environmental humidity near the graphene oxide layer 20 is changed, the refractive index of the graphene oxide layer 20 is also changed, the propagation of light inside the optical fiber 10 is influenced, the spectrum of emergent light through to this optic fibre 10 detects, and obtain this oxidation graphite alkene layer 20's refractive index change situation according to the change of spectrum and the corresponding relation of oxidation graphite alkene layer 20 refractive index, and the refractive index through oxidation graphite alkene layer 20 and the change relation of environmental humidity, obtain this oxidation graphite alkene layer 20 surrounding environment humidity, this application adopts optic fibre 10 sensor to measure humidity, avoid electronic component contact moisture, reduce the chance that electronic component produces the corrosion, prolong this humidity transducer's life, and because this application turns into the transmission spectrum change for the change with humidity, make the measurement accuracy to humidity higher.
The application provides a humidity sensing system based on optic fibre micro-nano structure, humidity sensing system includes: the humidity sensor comprises a light source, a detector and the humidity sensor, wherein the light source and the detector are respectively arranged at two ends of an optical fiber 10 of the humidity sensor, the light source is used for generating and sending light, and the detector is used for detecting the transmission spectrum of emergent light of the optical fiber 10.
Optionally, the light source is a laser light source.
Optionally, the detector is a spectrometer.
The laser light source and the spectrometer are respectively arranged at two ends of the optical fiber 10 of the humidity sensor, the laser light source is used for generating and sending light, and the spectrometer is used for detecting the transmission spectrum of emergent light of the optical fiber 10.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The utility model provides a humidity transducer based on optic fibre micro-nano structure which characterized in that, humidity transducer includes: the optical fiber comprises an optical fiber, a metal micro-nano structure layer and a graphene oxide layer, wherein a surface covering layer is removed from one section of the optical fiber, the metal micro-nano structure layer is an array in which metal micro-nano units are periodically arranged, the metal micro-nano structure layer is obliquely arranged inside a fiber core of the optical fiber, and the graphene oxide layer is coated on one section of the surface of the optical fiber with the surface covering layer removed.
2. The humidity sensor based on the optical fiber micro-nano structure according to claim 1, wherein the metal micro-nano unit is an L-shaped metal micro-nano unit or an h-shaped metal micro-nano unit.
3. The humidity sensor based on the optical fiber micro-nano structure according to claim 1, wherein the number of the metal micro-nano structure layers is multiple.
4. The humidity sensor based on the optical fiber micro-nano structure is characterized by further comprising a chiral molecular layer, wherein the chiral molecular layer is arranged among the plurality of metal micro-nano structure layers.
5. The humidity sensor based on the optical fiber micro-nano structure according to claim 1, wherein a plurality of protruding structures are arranged on the surface of the graphene oxide layer.
6. The humidity sensor based on the fiber micro-nano structure according to claim 1, wherein the fiber is a single mode fiber or a multimode fiber.
7. The utility model provides a humidity sensing system based on optic fibre micro-nano structure which characterized in that, humidity sensing system includes: the humidity sensor comprises a light source, a detector and the humidity sensor as claimed in any one of claims 1 to 6, wherein the light source and the detector are respectively arranged at two ends of an optical fiber of the humidity sensor, the light source is used for generating and transmitting light, and the detector is used for detecting the transmission spectrum of emergent light of the optical fiber.
8. The humidity sensing system based on the optical fiber micro-nano structure according to claim 7, wherein the light source is a laser light source.
9. The humidity sensing system based on the optical fiber micro-nano structure according to claim 7, wherein the detector is a spectrometer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010640040.8A CN111595793A (en) | 2020-07-06 | 2020-07-06 | Humidity sensor and system based on optical fiber micro-nano structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010640040.8A CN111595793A (en) | 2020-07-06 | 2020-07-06 | Humidity sensor and system based on optical fiber micro-nano structure |
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| CN111595793A true CN111595793A (en) | 2020-08-28 |
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| CN202010640040.8A Withdrawn CN111595793A (en) | 2020-07-06 | 2020-07-06 | Humidity sensor and system based on optical fiber micro-nano structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113899704A (en) * | 2021-09-30 | 2022-01-07 | 北京理工大学 | Method for directly measuring humidity based on optical bar code |
-
2020
- 2020-07-06 CN CN202010640040.8A patent/CN111595793A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113899704A (en) * | 2021-09-30 | 2022-01-07 | 北京理工大学 | Method for directly measuring humidity based on optical bar code |
| CN113899704B (en) * | 2021-09-30 | 2024-02-02 | 北京理工大学 | Method for directly measuring humidity based on optical bar code |
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