CN204287026U - Fiber Bragg grating type humidity sensor structure - Google Patents
Fiber Bragg grating type humidity sensor structure Download PDFInfo
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- CN204287026U CN204287026U CN201420858997.XU CN201420858997U CN204287026U CN 204287026 U CN204287026 U CN 204287026U CN 201420858997 U CN201420858997 U CN 201420858997U CN 204287026 U CN204287026 U CN 204287026U
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- stiff case
- optical fiber
- set collar
- elastic beam
- arched elastic
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Abstract
The utility model discloses a kind of fiber Bragg grating type humidity sensor structure, comprise stiff case and optical fiber, stiff case is rugby shape, stiff case offers multiple inlet opening, optical fiber is carved with Bragg grating, optical fiber is fixed with the first set collar and the second set collar, one end of optical fiber is stretched out from one end of stiff case and is connected with light source by fiber coupler, the other end of optical fiber stretches out the other end of stiff case, be provided with multiple arched elastic beam in stiff case and be coated on the elastic film outside multiple described arched elastic beam, one end of arched elastic beam is fixed on the first set collar, the other end of arched elastic beam is fixed on the second set collar, absorbent material is filled with in cavity between stiff case and elastic film.The compact conformation of this humidity sensor structure, obtain corresponding humidity by the change of measuring wavelength shift, volume is little, and measuring accuracy is high, anti-interference anticorrosive, is applicable to embedded, and distributed intelligence detects.
Description
Technical field
The utility model belongs to humidity sensor technical field, is specifically related to a kind of fiber Bragg grating type humidity sensor structure.
Background technology
Along with modern realization, be difficult to find out a field had nothing to do with humidity and come.Humidity is an important physical quantity, and the industries such as Aero-Space, generating power transformation, weaving, food, medicine, storage, agricultural are all very strict to the requirement of humidity, and carrying out effective Real-Time Monitoring and control to humidity parameter, is normal prerequisite of producing.The kind of humidity sensor is a lot, can be divided into electrolyte humidity sensors, semiconductor ceramics humidity sensor and organic high molecular polymer humidity sensor by humidity-sensitive material used; Electric resistance moisture sensor, capacitance type humidity sensor and photo-electric humidity sensor can be divided into by measuring principle.Desirable humidity sensor can use within the scope of wider temperature and humidity, and measuring accuracy is high, and the life-span is long, good stability, fast response time, hysteresis is little, highly sensitive, good linearity, and temperature coefficient is little, manufacturing process is simple, and volume is little, anticorrosive, high-low temperature resistant etc.
Humidity sensor is that one can experience water vapour content in gas, and converts the sensor of usable output signal to.Current most of humidity sensor adopts humidity-sensitive element as sensing arrangement, mainly be divided into the large class of resistance-type, condenser type two, the feature of hygristor is on substrate, cover the film that one deck wet sensory material makes, when the water vapor adsorption in air is on humidity-sensitive film, resistivity and the resistance value of element all change, and utilize this characteristic to measure humidity.The kind of hygristor is a lot, such as burning special hygristor, silicon hygristor, ceramic hygristor etc.The advantage of hygristor is highly sensitive, and major defect is that the interchangeability of the linearity and product is poor.Humicap is generally made with macromolecule membrane electric capacity, and conventional macromolecular material has polystyrene, polyimide, butyric acid acetate fiber etc.When ambient humidity changes, the specific inductive capacity of humicap changes, and its electric capacity is also changed, and its capacitance change is directly proportional to relative humidity.The major advantage of humicap be highly sensitive, product interchangeability good, the hysteresis of fast response time, humidity is little, be convenient to manufacture, easily realize miniaturization and integrated, its precision is generally lower than hygristor.Except resistance-type, capacitive moisture sensor, also have electrolyte ion type humidity-sensitive element, weight humidity-sensitive element (utilizing the change of humidity-sensitive film weight to change oscillation frequency), light intensity type humidity-sensitive element, surface acoustic wave humidity photosensitive elements etc.The linearity and the resistance tocrocking of humidity-sensitive element are poor, and when testing environment humidity, humidity-sensitive element will be chronically exposed in environment to be measured, is easy to contaminated and affects its measuring accuracy and long-time stability.
Utility model content
The purpose of this utility model is to overcome above-mentioned deficiency of the prior art, provides a kind of fiber Bragg grating type humidity sensor structure.The compact conformation of this humidity sensor structure, obtain corresponding humidity by the change of measuring wavelength shift, volume is little, and measuring accuracy is high, anti-interference anticorrosive, is applicable to embedded, and distributed intelligence detects.
For achieving the above object, the technical solution adopted in the utility model is: fiber Bragg grating type humidity sensor structure, it is characterized in that: comprise stiff case and optical fiber, described stiff case is rugby shape, described stiff case offers multiple inlet opening, described optical fiber is positioned at the inner and length direction along stiff case of stiff case and extends, described optical fiber is carved with Bragg grating, described optical fiber is fixed with the first set collar and the second set collar, described first set collar is near one end of stiff case, described second set collar is near the other end of stiff case, one end of described optical fiber is stretched out from one end of stiff case and is connected with light source by fiber coupler, the other end of described optical fiber stretches out the other end of stiff case, be provided with consistent with stiff case arc and around multiple arched elastic beam of described fiber deployment and the elastic film that is coated on outside multiple described arched elastic beam in described stiff case, one end of described arched elastic beam is fixed on the first set collar, the other end of described arched elastic beam is fixed on the second set collar, absorbent material is filled with in cavity between described stiff case and elastic film.
Above-mentioned fiber Bragg grating type humidity sensor structure, it is characterized in that: described first set collar offers the first through hole passed for optical fiber, described first set collar is positioned at multiple first connecting holes offered for a week for connecting one to one with multiple arched elastic beam of the first through hole; Described second set collar offers the second through hole passed for optical fiber, described second set collar is positioned at multiple second connecting holes offered for a week for connecting one to one with multiple arched elastic beam of the second through hole.
Above-mentioned fiber Bragg grating type humidity sensor structure, is characterized in that: the quantity of described arched elastic beam is eight, and eight described arched elastic beams are evenly laid around described optical fiber.
Above-mentioned fiber Bragg grating type humidity sensor structure, is characterized in that: described stiff case is steel shell.
The utility model compared with prior art has the following advantages:
1, structure of the present utility model is simple, rationally novel in design.
2, the utility model adopts stiff case, plays protection, resistance to compression effect, and hydrone can be made again to pass through, result of use is good simultaneously.
3, the utility model is based on bragg grating, and its measuring accuracy is high, measuring speed fast, as long as select the material that the hygral expansion linearity is good, can show fabulous measurement effect on the whole.
4, of the present utility model to realize cost low, and result of use is good, is convenient to promote the use of.
In sum, the utility model structure is simple, and rationally novel in design, functional reliability is high, long service life, and sensing is effective, is convenient to promote the use of.
Below by drawings and Examples, the technical solution of the utility model is described in further detail.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Fig. 2 is the structural representation of the utility model first set collar and the second set collar.
Description of reference numerals:
1-stiff case; 2-elastic film; 3-arched elastic beam;
4-the first set collar; 4-1-the first through hole; 4-2-the first connecting hole;
5-optical fiber; 6-Bragg grating; 7-light source;
8-fiber coupler; 9-the second set collar; 9-1-the second through hole;
9-2-the second connecting hole; 10-inlet opening; 11-absorbent material.
Embodiment
A kind of fiber Bragg grating type humidity sensor structure as shown in Figure 1, comprise stiff case 1 and optical fiber 5, described stiff case 1 is rugby shape, described stiff case 1 offers multiple inlet opening 10, described optical fiber 5 is positioned at the inner and length direction along stiff case 1 of stiff case 1 and extends, described optical fiber 5 is carved with Bragg grating 6, described optical fiber 5 is fixed with the first set collar 4 and the second set collar 9, described first set collar 4 is near one end of stiff case 1, described second set collar 9 is near the other end of stiff case 1, one end of described optical fiber 5 is stretched out from one end of stiff case 1 and is connected with light source 7 by fiber coupler 8, the other end of described optical fiber 5 stretches out the other end of stiff case 1, and the multiple arched elastic beam 3 around described optical fiber 5 laid and the elastic film 2 that be coated on multiple described arched elastic beam 3 outside consistent with stiff case 1 arc is provided with in described stiff case 1, one end of described arched elastic beam 3 is fixed on the first set collar 4, the other end of described arched elastic beam 3 is fixed on the second set collar 9, absorbent material 11 is filled with in cavity between described stiff case 1 and elastic film 2.Wherein, described inlet opening 10 for aperture be 50 μm ~ 100 μm.
As shown in Figure 2, described first set collar 4 offers the first through hole 4-1 passed for optical fiber 5, described first set collar 4 is positioned at the multiple first connecting hole 4-2 offered for a week for connecting one to one with multiple arched elastic beam 3 of the first through hole 4-1; Described second set collar 9 offers the second through hole 9-1 passed for optical fiber 5, described second set collar 9 is positioned at the multiple second connecting hole 9-2 offered for a week for connecting one to one with multiple arched elastic beam 3 of the second through hole 9-1.During concrete use, described arched elastic beam 3 one end and the first set collar 4 adopt 502 glue to bond, and described arched elastic beam 3 other end and the second set collar 9 adopt 502 glue to bond.
In the present embodiment, the quantity of described arched elastic beam 3 is eight, and eight described arched elastic beams 3 are evenly laid around described optical fiber 5.Described stiff case 1 is steel shell.
In the present embodiment, this humidity sensor structure in use, extraneous steam enters stiff case 1 by inlet opening 10 and infiltrates absorbent material 11, absorbent material 11 produces after sucking steam and expands, and pressure is applied to multiple arched elastic beam 3, arched elastic beam 3 is out of shape under pressure, arched elastic beam 3 two-end-point is forced to have the trend of outside movement, because the two ends of arched elastic beam 3 are fixedly connected with optical fiber 5 two ends, the arched elastic beam 3 pairs of Bragg gratings 6 producing pulling force and pressurized in optical fiber 5 both sides are applied pulling force, under the effect of described pulling force, the centre wavelength of Bragg grating 6 reflected light will be drifted about, wave length shift and humidity relation curve can be set up by standard test, namely the wave length shift by detecting Bragg grating 6 can the change of indirect inspection humidity.
When humidity reduces, absorbent material 11 will dry out son, volume reduces, arched elastic beam 3 pressurized reduces, at optical fiber 5 two ends, pulling force also will reduce, the change of optical fiber 5 two ends pulling force will cause optical fiber 5 wave length shift, and it is how much linear that this wave length shift size and absorbent material 11 absorb hydrone.
The compact conformation of this humidity sensor structure, obtain corresponding humidity by the change of measuring wavelength shift, have volume little, measuring accuracy is high, anti-interference anticorrosive, and structure is simple, low cost and other advantages, is applicable to embedded, and distributed intelligence detects.
In the present embodiment, described arched elastic beam 3 adopts mild carbon steel to make.Described absorbent material 11 adopts polyimide powder.
The above; it is only preferred embodiment of the present utility model; not the utility model is imposed any restrictions; every above embodiment is done according to the utility model technical spirit any simple modification, change and equivalent structure transformation, all still belong in the protection domain of technical solutions of the utility model.
Claims (4)
1. fiber Bragg grating type humidity sensor structure, it is characterized in that: comprise stiff case (1) and optical fiber (5), described stiff case (1) is rugby shape, described stiff case (1) offers multiple inlet opening (10), described optical fiber (5) is positioned at the inner and length direction along stiff case (1) of stiff case (1) and extends, described optical fiber (5) is carved with Bragg grating (6), described optical fiber (5) is fixed with the first set collar (4) and the second set collar (9), described first set collar (4) is near one end of stiff case (1), described second set collar (9) is near the other end of stiff case (1), one end of described optical fiber (5) is stretched out from one end of stiff case (1) and is connected with light source (7) by fiber coupler (8), the other end of described optical fiber (5) stretches out the other end of stiff case (1), be provided with and the multiple arched elastic beam (3) of around described optical fiber (5) laying consistent with stiff case (1) arc in described stiff case (1) and be coated on the elastic film (2) in multiple described arched elastic beam (3) outside, one end of described arched elastic beam (3) is fixed on the first set collar (4), the other end of described arched elastic beam (3) is fixed on the second set collar (9), absorbent material (11) is filled with in cavity between described stiff case (1) and elastic film (2).
2. fiber Bragg grating type humidity sensor structure according to claim 1, it is characterized in that: described first set collar (4) offers for optical fiber (5) the first through hole (4-1) of passing, described first set collar (4) is upper and be positioned at multiple first connecting holes (4-2) offered for a week for connecting one to one with multiple arched elastic beam (3) of the first through hole (4-1); Described second set collar (9) offers for optical fiber (5) the second through hole (9-1) of passing, described second set collar (9) is upper and be positioned at multiple second connecting holes (9-2) offered for a week for connecting one to one with multiple arched elastic beam (3) of the second through hole (9-1).
3. fiber Bragg grating type humidity sensor structure according to claim 1, is characterized in that: the quantity of described arched elastic beam (3) is eight, and eight described arched elastic beams (3) are evenly laid around described optical fiber (5).
4. fiber Bragg grating type humidity sensor structure according to claim 1, is characterized in that: described stiff case (1) is steel shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420858997.XU CN204287026U (en) | 2014-12-30 | 2014-12-30 | Fiber Bragg grating type humidity sensor structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420858997.XU CN204287026U (en) | 2014-12-30 | 2014-12-30 | Fiber Bragg grating type humidity sensor structure |
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| CN204287026U true CN204287026U (en) | 2015-04-22 |
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| CN201420858997.XU Expired - Fee Related CN204287026U (en) | 2014-12-30 | 2014-12-30 | Fiber Bragg grating type humidity sensor structure |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107064011A (en) * | 2017-02-09 | 2017-08-18 | 北京航天控制仪器研究所 | A kind of fiber bragg grating temperature sensor |
| CN108279211A (en) * | 2018-03-25 | 2018-07-13 | 南京大学 | A kind of quasi-distributed system, sensing device and method measuring soil moisture content |
| CN109828097A (en) * | 2019-01-09 | 2019-05-31 | 湖南大学 | A kind of soil water meauring device and method based on fiber bragg grating |
| CN111323419A (en) * | 2020-03-27 | 2020-06-23 | 防灾科技学院 | Soil moisture detection device |
-
2014
- 2014-12-30 CN CN201420858997.XU patent/CN204287026U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107064011A (en) * | 2017-02-09 | 2017-08-18 | 北京航天控制仪器研究所 | A kind of fiber bragg grating temperature sensor |
| CN107064011B (en) * | 2017-02-09 | 2020-06-09 | 北京航天控制仪器研究所 | Fiber grating humidity sensor |
| CN108279211A (en) * | 2018-03-25 | 2018-07-13 | 南京大学 | A kind of quasi-distributed system, sensing device and method measuring soil moisture content |
| CN109828097A (en) * | 2019-01-09 | 2019-05-31 | 湖南大学 | A kind of soil water meauring device and method based on fiber bragg grating |
| CN109828097B (en) * | 2019-01-09 | 2020-04-07 | 湖南大学 | Device and method for measuring soil moisture content based on fiber Bragg grating |
| CN111323419A (en) * | 2020-03-27 | 2020-06-23 | 防灾科技学院 | Soil moisture detection device |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150422 Termination date: 20151230 |
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| EXPY | Termination of patent right or utility model |