CN203083918U - Fiber Bragg grating humidity sensing device based on spring ancillary support - Google Patents
Fiber Bragg grating humidity sensing device based on spring ancillary support Download PDFInfo
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- CN203083918U CN203083918U CN 201320039414 CN201320039414U CN203083918U CN 203083918 U CN203083918 U CN 203083918U CN 201320039414 CN201320039414 CN 201320039414 CN 201320039414 U CN201320039414 U CN 201320039414U CN 203083918 U CN203083918 U CN 203083918U
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Abstract
The utility model relates to a fiber Bragg grating (FBG) humidity sensing device based on spring ancillary support. FBG humidity sensors on which humidity sensitivity materials are coated mainly consist of two main types, namely FBG humidity sensors which sense by utilizing the refraction index change characteristic and FBG humidity sensors which sense by utilizing the expansion characteristic of a humidity sensitivity film, and to overcome the defects of the humidity sensors that the humidity sensitivity film is likely to loose and the service life is short, the expandable humidity sensitivity material is filled into the center of a small spring, two ends of the spring are fixed with two ends of the FBG in a welding mode by using soldering tin, and a single mode fiber and a fiber grating interrogator are connected together so as to form the humidity sensing device. When the humidity sensing device is used, the humidity sensitivity material expands to drive the small spring to axially move together, and also drive the FBG to axially expand, and by detecting the change of the reflection wavelength, the humidity sensation is realized. By utilizing the FBG humidity sensing device, the bonding capability of the fiber surface with the humidity sensitivity material is enhanced, and the aging speed of the humidity sensitivity material is slowed down.
Description
Technical field
The utility model belongs to technical field of optical fiber sensing, relates to based on the auxiliary Fiber Bragg Grating FBG humidity sensing device of supporting of spring.
Background technology
In broad terms, humidity is exactly the physical quantity of expression moisture.It can be by people's perception, and is synthermal the same.And along with scientific-technical progress, industry and scientific research environment are more and more higher to the requirement of " humidity " this important environmental parameters, thereby sensor is also had higher requirement.Especially in the scientific experiment of some environmental requirement harshnesses, humidity value will directly influence experimental result, so humidity begins one's study as an independent subject.Humidity also influences the quality of people's life simultaneously except affecting scientific and technological research field.Now, people are more and more higher to the comfort level requirement of living environment, and a lot of families buy humidifier and improve air quality.As seen, " humidity " is closely bound up with people's life, and influence power is increasing.Along with the fast development of industrial or agricultural, national defence, science and technology and national economy, the control of ambient humidity and detection are subjected to people more and more pay close attention to, its market is also increasing.In fields such as petrochemical complex, electric power, weaving, often relate to the temperature and humidity measurement problem of some inflammable and explosive occasions.Common humidity sensor mainly contains electric weight type humidity sensors such as non electrical quantity types such as hair formula, wet and dry bulb formula and condenser type, resistance-type.Former structure is simple, cheap, but precision is not high, and measurement range is limited; Latter's measuring accuracy height, but be subject to electromagnetic interference (EMI).These traditional humidity sensors have not satisfied the needs of development in science and technology in modern age.In recent years, along with optical fiber technology and light development of integration technology, the optics humidity sensor is subjected to greatly paying close attention to and widespread use.
Fiber Bragg Grating FBG (FBG) is simple, a most general a kind of fiber grating, has important use to be worth at sensory field of optic fibre.The FBG humidity sensor mainly is meant the FBG sensor that applies humidity-sensitive material.This FBG humidity sensor that is coated with humidity-sensitive material mainly is divided into two big classes.The first kind is to utilize the refractive index characteristics of humidity sensing film to carry out the FBG humidity sensor of sensing.Be coated with the film of one deck to humidity sensitive on the bragg grating grid region part of corrosion, when ambient humidity changed, the refractive index of this film will change thereupon, made bragg wavelength change, thus the detectable situation of change that goes out humidity.Though this type of transducer sensitivity is very high, its shortcoming is obvious, attenuate behind the fiber optical corrosive, and fragile easily broken, practical application is poor.Second class is to utilize the expansion characteristics of humidity sensing film to carry out the FBG humidity sensor of sensing.When humidity changed, FBG humidity sensor coat can expand, and caused FBG that strain takes place, and its bragg wavelength is changed, thereby realized the sensing to humidity.Yet because the bounding force of humidity sensitive thin film and optical fiber surface is less, the phenomenon of becoming flexible even coming off after long-time use can cause the coat of sensor repeatedly to expand.Have a strong impact on the operate as normal of sensor.Be coated with the problem that humidity sensing film is easily loosening, the life-span is short of the FBG humidity sensor of humidity-sensitive material at above two classes, need carry out particular design and optimization the device of the sensing part of FBG humidity sensor.
Summary of the invention
The purpose of this utility model is exactly to come off for the coat that solves FBG humidity sensor under the humidity environment is aging easily, and making provides humidity indeterminacy even cause its problem that can't work based on the auxiliary FBG humidity sensing device of supporting of spring.
The utility model is the technical scheme that the technical solution problem is taked:
Based on the auxiliary FBG humidity sensing device of supporting of spring, comprising: little spring and pad that fiber Bragg grating (FBG) demodulator, single-mode fiber, FBG, center are poured into by expandable humidity-sensitive material.
The little spring two ends that two ends and the center cavity of FBG is perfused with humidity-sensitive material are fixing with the scolding tin welding respectively, and the end of FBG is connected the formation humidity sensing device with fiber Bragg grating (FBG) demodulator light by single-mode fiber.
The beneficial effect that the utility model had is: during work, humidity-sensitive material expands, and can drive little spring axially-movable synchronously together, and because the fixedly effect of solder joint, drive FBG axially stretches.Wherein, two solder joints are fixed, and have strengthened the adhesive power of optical fiber surface and humidity-sensitive material; The reverse draw that produces during little spring motion simultaneously makes humidity-sensitive material have better elastic, makes its axial stretching freely, promptly has the effect that slows down material aging.
Description of drawings
Fig. 1 is the structural representation of humidity sensor of the present utility model;
Wherein: 1. fiber Bragg grating (FBG) demodulator, 2. single-mode fiber, 3. Fiber Bragg Grating FBG, 4. expandable humidity-sensitive material, 5. little spring, 6. pad.
Embodiment
Below in conjunction with accompanying drawing the technical solution of the utility model is described further.
With reference to Fig. 1, fiber Bragg grating (FBG) demodulator 1 is connected with single-mode fiber 2 light, single-mode fiber 2 is connected with Fiber Bragg Grating FBG 3 light, the two ends of Fiber Bragg Grating FBG 3 are fixing by pad 6 with the two ends of the little spring 5 that is perfused with inflatable humidity-sensitive material 4, to guarantee that little spring 5 moves vertically with optical fiber Bragg optical fiber 3, promptly constitute humidity sensing device.
The working method of this device: the light that the light source from fiber Bragg grating (FBG) demodulator sends passes through single-mode fiber, enter FBG, because FBG is connected by solder joint with the little spring two ends that are perfused with inflatable humidity-sensitive material, when surrounding relative humidity changes, the humidity-sensitive material volume that is poured in the spring changes, produce stress along the FBG axial direction, drive the axially-movable of FBG, and then the humidity in the external world is changed the skew that is converted to Prague centre wavelength.In fiber Bragg grating (FBG) demodulator, correlation parameter changes in the monitoring spectrogram, realizes humidity sensor as the drift of loss peak.
This device can realize that the gordian technique of humidity sensor is: the elasticity coefficient that is perfused with the little spring of inflatable humidity-sensitive material and Fiber Bragg Grating FBG in the device is suitable, in the moisture measurement process, humidity-sensitive material expands, volume change drives the lightweight little spring that adheres to each other with it and together stretches.The little spring two ends weld together because of the two ends with Fiber Bragg Grating FBG, so the stretching of spring drives the stretching, extension of Fiber Bragg Grating FBG.Thereby make that the cycle of Fiber Bragg Grating FBG is elongated, cause the variation of bragg wavelength.Light is by behind the Fiber Bragg Grating FBG, and reflected back has the signal of humidity change information, enter the fiber grating demodulation device after, but analytical solution accesses the information that humidity changes.The final sensing that realizes humidity information.
Fiber Bragg grating (FBG) demodulator is a HKA-M series in the present embodiment, and initial wavelength is 1566nm, and grating grid region length is about 2cm, and the elasticity coefficient of little spring is-20N/m, and length is about 2.2cm, and humidity-sensitive material is polyimide (PI).
Claims (1)
1. one kind based on the auxiliary Fiber Bragg Grating FBG humidity sensing device of supporting of spring, comprise fiber Bragg grating (FBG) demodulator, Fiber Bragg Grating FBG (FBG), the little spring that is perfused with expandable humidity-sensitive material and pad, it is characterized in that: it is fixing that Fiber Bragg Grating FBG and center cavity are perfused with the little spring two ends welding of humidity-sensitive material, one end of Fiber Bragg Grating FBG is connected with fiber Bragg grating (FBG) demodulator light by single-mode fiber, constitutes the Fiber Bragg Grating FBG humidity sensor; During work, humidity-sensitive material expands, and can drive little spring axially-movable synchronously together, and because the fixedly effect of solder joint, drive Fiber Bragg Grating FBG (FBG) and axially stretch, by utilizing fiber Bragg grating (FBG) demodulator detection of reflected wavelength change, thereby realize Humidity Detection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320039414 CN203083918U (en) | 2013-01-21 | 2013-01-21 | Fiber Bragg grating humidity sensing device based on spring ancillary support |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320039414 CN203083918U (en) | 2013-01-21 | 2013-01-21 | Fiber Bragg grating humidity sensing device based on spring ancillary support |
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| CN203083918U true CN203083918U (en) | 2013-07-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201320039414 Expired - Fee Related CN203083918U (en) | 2013-01-21 | 2013-01-21 | Fiber Bragg grating humidity sensing device based on spring ancillary support |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104198395A (en) * | 2014-09-15 | 2014-12-10 | 西安科技大学 | Two-way traction fiber bragg grating humidity sensor |
-
2013
- 2013-01-21 CN CN 201320039414 patent/CN203083918U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104198395A (en) * | 2014-09-15 | 2014-12-10 | 西安科技大学 | Two-way traction fiber bragg grating humidity sensor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130724 Termination date: 20140121 |