CN109444080A - A kind of temperature-insensitive humidity sensor - Google Patents
A kind of temperature-insensitive humidity sensor Download PDFInfo
- Publication number
- CN109444080A CN109444080A CN201811516968.4A CN201811516968A CN109444080A CN 109444080 A CN109444080 A CN 109444080A CN 201811516968 A CN201811516968 A CN 201811516968A CN 109444080 A CN109444080 A CN 109444080A
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- Prior art keywords
- optical fiber
- single mode
- mode optical
- light
- butterfly
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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
- G01N21/45—Refractivity; Phase-affecting properties, e.g. optical path length using interferometric methods; using Schlieren methods
-
- 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
- G01N21/45—Refractivity; Phase-affecting properties, e.g. optical path length using interferometric methods; using Schlieren methods
- G01N2021/458—Refractivity; Phase-affecting properties, e.g. optical path length using interferometric methods; using Schlieren methods using interferential sensor, e.g. sensor fibre, possibly on optical waveguide
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention discloses a kind of temperature-insensitive humidity sensors, by wideband light source, first single mode optical fiber, butterfly cone, second single mode optical fiber, spectrometer, humidity chamber composition, butterfly cone is drawn by hollow photon crystal, to extraneous temperature-insensitive, butterfly poppet surface is coated with hydrophilic material polyurethane, it is with a thickness of 10 microns, the light that wideband light source issues enters the first single mode optical fiber, forward light by after the first single mode optical fiber by dislocation at, light at this time is divided into the light that two beams are propagated in fibre core and the light propagated in covering, two-beam proceeds at butterfly cone and is coupled into fibre core again, it then proceedes to form interference at propagated forward to dislocation again, final light beam is by entering spectrometer by transmission fiber after the second single mode optical fiber, when humidity increases in humidity chamber, the moisture being adsorbed on polyurethane is more and more, cladding mode Effective refractive index changes, and spectrum and humidity variation relation can be obtained in the change of transmitted spectrum signal in spectrometer, realizes humidity sensor.
Description
Technical field
The invention belongs to light fibre humidity field of sensing technologies, and in particular to a kind of temperature-insensitive humidity sensor technology neck
Domain.
Background technique
Compared to traditional electronics humidity sensor, light fibre humidity transducer has some unique advantages, such as: structure
Compact, lesser volume, lighter weight, completely immune for extraneous complicated electromagnetic environment, corrosion resistance is stronger, can be with
Easily realize long-range monitoring.
Summary of the invention
In view of the deficiencies of the prior art, the purpose of the present invention is to provide a kind of temperature-insensitive humidity sensor, pass through
The variation of peak value is observed to detect to humidity, which is easily integrated, and is easy to implement.
The invention is realized by the following technical scheme: a kind of temperature-insensitive humidity sensor, by wideband light source (1),
One single mode optical fiber (2), butterfly bore (3), the second single mode optical fiber (4), spectrometer (5), humidity chamber (6), composition, it is characterised in that:
It is 1cm that butterfly, which bores (3) length, and wideband light source (1) is connect with the left end of the first single mode optical fiber (2) by transmission fiber, and first is single
The left end of right end and the butterfly cone (3) of mode fiber (2) is by heat sealing machine dislocation welding, and magnitude of misalignment is 9 microns, and butterfly bores (3)
The left end of right end and the second single mode optical fiber (4) is by heat sealing machine dislocation welding, and magnitude of misalignment is 9 microns, the second single mode optical fiber (4)
Right end is connect with spectrometer (5) by transmission fiber.
The working principle of the invention is: butterfly cone (3) is drawn by hollow photon crystal, to extraneous temperature-insensitive,
Butterfly cone (3) surface is coated with hydrophilic material polyurethane (7), polyurethane (7) with a thickness of 10 microns, wideband light source (1) issues
Light by transmission fiber enter the first single mode optical fiber (2), forward light by after the first single mode optical fiber (2) by dislocation at,
Light at this time is divided into the light that two beams are propagated in fibre core and the light propagated in covering, and two-beam proceeds at butterfly cone (3)
Again it is coupled into fibre core, then proceedes to form interference at propagated forward to dislocation again, final light beam passes through the second single-mode optics
Enter spectrometer (5) after fine (4) by transmission fiber, when humidity increases in humidity chamber (6), is adsorbed on poly- on butterfly cone (3)
The moisture of urethane (7) is more and more, and covering Effective index changes, and the change of transmitted spectrum signal can in spectrometer (5)
Spectrum and humidity variation relation are obtained, realizes humidity sensor.
The beneficial effects of the present invention are: using optical fiber is made respiration transducer, at low cost, small in size, comfort level is high, is
Fiber respiratory sensor provides a kind of realistic plan, simple and easy, convenient and reliable.
Detailed description of the invention
Fig. 1 is a kind of system diagram of temperature-insensitive humidity sensor.
Fig. 2 is a kind of spectrogram of temperature-insensitive humidity sensor.
Fig. 3 is a kind of fitted figure of temperature-insensitive humidity sensor.
Specific embodiment
Present invention is further described in detail with specific embodiment with reference to the accompanying drawing.
Referring to attached drawing 1,2,3, a kind of temperature-insensitive humidity sensor, by wideband light source (1), the first single mode optical fiber (2),
Butterfly bores (3), the second single mode optical fiber (4), spectrometer (5), humidity chamber (6), composition, it is characterised in that: butterfly bores (3) length and is
1cm, wideband light source (1) are connect with the left end of the first single mode optical fiber (2) by transmission fiber, the right end of the first single mode optical fiber (2)
Left end with butterfly cone (3) is by heat sealing machine dislocation welding, and magnitude of misalignment is 9 microns, and butterfly bores the right end and the second single-mode optics of (3)
By heat sealing machine dislocation welding, magnitude of misalignment is 9 microns for the left end of fine (4), the right end of the second single mode optical fiber (4) and spectrometer (5)
It is connected by transmission fiber.
The working principle of the invention is: butterfly cone (3) is drawn by hollow photon crystal, to extraneous temperature-insensitive,
Butterfly cone (3) surface is coated with hydrophilic material polyurethane (7), polyurethane (7) with a thickness of 10 microns, wideband light source (1) issues
Light by transmission fiber enter the first single mode optical fiber (2), forward light by after the first single mode optical fiber (2) by dislocation at,
Light at this time is divided into the light that two beams are propagated in fibre core and the light propagated in covering, and two-beam proceeds at butterfly cone (3)
Again it is coupled into fibre core, then proceedes to form interference at propagated forward to dislocation again, final light beam passes through the second single-mode optics
Enter spectrometer (5) after fine (4) by transmission fiber, when humidity increases in humidity chamber (6), is adsorbed on poly- on butterfly cone (3)
The moisture of urethane (7) is more and more, and covering Effective index changes, and the change of transmitted spectrum signal can in spectrometer (5)
Spectrum and humidity variation relation are obtained, realizes humidity sensor.
The beneficial effects of the present invention are: using optical fiber is made respiration transducer, at low cost, small in size, comfort level is high, is
Fiber respiratory sensor provides a kind of realistic plan, simple and easy, convenient and reliable.
Claims (1)
1. a kind of temperature-insensitive humidity sensor, by wideband light source (1), the first single mode optical fiber (2), butterfly bores (3), second is single
Mode fiber (4), spectrometer (5), humidity chamber (6), composition, it is characterised in that: it is 1cm, wideband light source (1) that butterfly, which bores (3) length,
It is connect with the left end of the first single mode optical fiber (2) by transmission fiber, a left side for right end and the butterfly cone (3) of the first single mode optical fiber (2)
End is by heat sealing machine dislocation welding, and magnitude of misalignment is 9 microns, and the left end of the right end and the second single mode optical fiber (4) of butterfly cone (3) passes through
Heat sealing machine dislocation welding, magnitude of misalignment are 9 microns, and the right end of the second single mode optical fiber (4) and spectrometer (5) are connected by transmission fiber
It connects；Butterfly cone (3) is drawn by hollow photon crystal, and to extraneous temperature-insensitive, butterfly cone (3) surface is coated with hydrophily material
Expect polyurethane (7), polyurethane (7) with a thickness of 10 microns, it is single that the light that wideband light source (1) issues by transmission fiber enters first
Mode fiber (2), forward light by after the first single mode optical fiber (2) by dislocation at, light at this time is divided into two beams and passes in fibre core
The light broadcast and the light propagated in covering, two-beam proceeds at butterfly cone (3) and is coupled into fibre core again, before then proceeding to
Interference is formed at dislocation again to propagating to, final light beam is by entering spectrum by transmission fiber after the second single mode optical fiber (4)
Instrument (5), when humidity increases in humidity chamber (6), the moisture for being adsorbed on the polyurethane (7) on butterfly cone (3) is more and more, cladding mode
Effective refractive index changes, and spectrum and humidity variation relation can be obtained in the change of transmitted spectrum signal in spectrometer (5), realizes wet
Degree sensing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811516968.4A CN109444080A (en) | 2018-12-12 | 2018-12-12 | A kind of temperature-insensitive humidity sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811516968.4A CN109444080A (en) | 2018-12-12 | 2018-12-12 | A kind of temperature-insensitive humidity sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109444080A true CN109444080A (en) | 2019-03-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811516968.4A Pending CN109444080A (en) | 2018-12-12 | 2018-12-12 | A kind of temperature-insensitive humidity sensor |
Country Status (1)
| Country | Link |
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| CN (1) | CN109444080A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113281303A (en) * | 2021-06-29 | 2021-08-20 | 哈尔滨理工大学 | Vernier sensitization semi-filled polyimide optical fiber FPI humidity sensor |
-
2018
- 2018-12-12 CN CN201811516968.4A patent/CN109444080A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113281303A (en) * | 2021-06-29 | 2021-08-20 | 哈尔滨理工大学 | Vernier sensitization semi-filled polyimide optical fiber FPI humidity sensor |
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