CN204064894U - A kind of bulk material moisture expantion fiber bragg grating temperature sensor - Google Patents
A kind of bulk material moisture expantion fiber bragg grating temperature sensor Download PDFInfo
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- CN204064894U CN204064894U CN201420529111.7U CN201420529111U CN204064894U CN 204064894 U CN204064894 U CN 204064894U CN 201420529111 U CN201420529111 U CN 201420529111U CN 204064894 U CN204064894 U CN 204064894U
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Abstract
The utility model discloses a kind of bulk material moisture expantion fiber bragg grating temperature sensor, comprise three layers of post shell, light grating and spring top board, three layers of post shell are by base plate, shell, mesochite and inner casing composition, shell, the bottom of mesochite and inner casing is all connected with base plate, shell and mesochite all have multiple first through hole, base plate has multiple second through hole, moisture expantion block is closely filled with between mesochite and inner casing, spring top board is made up of top board and spring, spring to be arranged between shell and mesochite and can free-extension, top board is arranged on mesochite top, both ends of the spring respectively with base plate and top plate contact, base plate center has the first via hole, top board center has the second via hole, light grating is successively through the second via hole, inner casing and the first via hole and can in inner casing free-extension, light grating and top board and base plate are all connected, top board has multiple third through-hole.The utility model accuracy of detection is high, and prestress adds carried convenient, can realize detecting the pointwise of ambient humidity.
Description
Technical field
The utility model relates to a kind of humidity sensor, especially relates to a kind of bulk material moisture expantion fiber bragg grating temperature sensor.
Background technology
Along with the develop rapidly of science and technology, the demand that people accurately measure nature physical parameter is also more and more urgent.In the process, optical fiber sensing technology also obtain comprehensively development and applies widely, and this wherein just comprises the technology of fiber grating for sensing and measurement.As everyone knows, fiber grating can be measured accurately to temperature, stress, strain, displacement, acceleration etc., is then the field that a recent development is got up, faces a scientific and engineering difficult problem much urgently to be resolved hurrily simultaneously to the measurement of ambient humidity.Traditional humidity sensor utilizes functional material to the absorption of ambient moisture, change the electricity parameters such as the resistance of self, electric capacity and carry out Humidity Detection, fiber grating is then that humidity is measured in the change by the change of sub-for Environmental Water content being become light wave optical parameter, has the Inherent advantage of carrying out high-acruracy survey.The a large amount of research work of forefathers shows, the conventional method utilizing fiber grating to carry out moisture measurement is the synthetic plastics material of the similar polyimide of surperficial coated with multiple layer at fiber grating, utilize the moisture expantion characteristic of this material to pull the change of stress in fiber grating, strain, carry out Humidity Detection by the drift of optic fiber grating wavelength.The weak point of this method is, in order to ensure the coated weight of hygroscopic material, the polyimide on fiber grating surface also can only about tens micron thickness after repeatedly applying, and when test environment humidity changes 10%, wave length shift is less than 0.1 nanometer.Meanwhile, due to the increase of fiber grating length, make the ability of adopting the fiber bragg grating temperature sensor disappearance pointwise detection made in this way.On the other hand, the weak point of this humidity sensor is exactly the prestress loading problem that not can solve fiber grating.
Utility model content
The purpose of this utility model is to overcome above-mentioned deficiency of the prior art, a kind of bulk material moisture expantion fiber bragg grating temperature sensor is provided, its structure is simple, convenient for production, can increase the volume of hygroscopic material in fiber bragg grating temperature sensor, solve the prestress loading problem of fiber grating, can realize detecting the pointwise of ambient humidity, accuracy of detection is high, and structural stability is good simultaneously, practical, be convenient to promote the use of.
For achieving the above object, the technical solution adopted in the utility model is: a kind of bulk material moisture expantion fiber bragg grating temperature sensor, it is characterized in that: comprise three layers of post shell, light grating and the spring top board be arranged in described three layers of post shell, described three layers of post shell are by base plate, shell, mesochite and inner casing composition, described shell, mesochite and the equal both ends open of inner casing, described shell, mesochite is all fixedly connected with base plate with the bottom of inner casing, described mesochite is concordant with the top of inner casing, the top of described shell protrudes from the top of mesochite, described shell and mesochite all have multiple first through hole, described base plate has multiple second through hole, moisture expantion block is closely filled with between described mesochite and inner casing, described spring top board is made up of top board and spring, described spring to be arranged between shell and mesochite and can free-extension, described top board is arranged on the top of mesochite and can slides along the inwall of shell, the bottom of described spring and contacts baseplate, the top of described spring and top plate contact, the center of described base plate has the first via hole, the center of described top board has the second via hole, the bottom of described light grating is successively through the second via hole, inner casing and the first via hole and can in inner casing free-extension, described light grating is all fixedly connected with base plate with top board, described top board has multiple third through-hole.
Above-mentioned a kind of bulk material moisture expantion fiber bragg grating temperature sensor, it is characterized in that: the top of described shell is provided with housing shrouding, described housing shrouding is arranged in the enclosure, described housing shrouding has multiple fourth hole, and the center of described housing shrouding has the 3rd via hole passed for light grating top.
Above-mentioned a kind of bulk material moisture expantion fiber bragg grating temperature sensor, it is characterized in that: the shape of cross section of described light grating is for circular, described first via hole and the second via hole are circular hole, and the diameter of described first via hole, the second via hole and the 3rd via hole is all greater than the diameter of light grating.
Above-mentioned a kind of bulk material moisture expantion fiber bragg grating temperature sensor, is characterized in that: described light grating all welds with top board and base plate.
Above-mentioned a kind of bulk material moisture expantion fiber bragg grating temperature sensor, it is characterized in that: described spring is cylindrical spring, the shape of cross section of described shell, mesochite and inner casing is annular, and the external diameter of described spring is less than the internal diameter of shell, and the internal diameter of described spring is greater than the external diameter of mesochite.
Above-mentioned a kind of bulk material moisture expantion fiber bragg grating temperature sensor, it is characterized in that: the bottom of described spring is connected with base plate, the top of described spring is connected with top board.
Above-mentioned a kind of bulk material moisture expantion fiber bragg grating temperature sensor, is characterized in that: described moisture expantion block is polyimide block.
Above-mentioned a kind of bulk material moisture expantion fiber bragg grating temperature sensor, is characterized in that: the length of described housing openings part is equal with the length of mesochite perforate part.
Above-mentioned a kind of bulk material moisture expantion fiber bragg grating temperature sensor, it is characterized in that: multiple first through hole is evenly arranged, multiple second through hole is evenly arranged, and multiple third through-hole is evenly arranged, and multiple fourth hole is evenly arranged.
The utility model compared with prior art has the following advantages:
1, push up coping when the utility model utilizes the moisture absorption of moisture expantion block to expand, make to produce stress, strain in fiber grating, thus carry out ambient humidity detection, accuracy of detection is high.
2, the utility model adopts the compression of spring to carry out prestressed applying to fiber grating, efficiently solves fiber grating prestress application in prior art and adopts similar lift heavy thing to carry out stretching, to apply difficulty problem; On the other hand, when moisture expantion block moisture expantion top coping, top board is upheld than being easier to drive the spring being in compressive state, thus carries out moisture measurement.
3, the utility model adopts the hydrone in moisture expantion block absorbing environmental, its moisture absorption and dehumidification all carry out in this device scope of small volume, can realize detecting the point of humidity, compensate for fiber grating longer dimension in existing fiber grating humidity sensor and the defect of the some detectability lost.
4, simple, with low cost, convenient for production, the good stability of structure of the present utility model, practical, is convenient to promote the use of.
In sum, the utility model can increase the volume of hygroscopic material in fiber bragg grating temperature sensor, solve the prestressed loading problem of fiber grating, can realize detecting the pointwise of ambient humidity, accuracy of detection is high, and structure is simple simultaneously, convenient for production, good stability, practical, be convenient to promote the use of.
Below by drawings and Examples, the utility model is described in further detail.
Accompanying drawing explanation
Fig. 1 is semisectional view of the present utility model.
Fig. 2 is the structural representation of the utility model three layers of post shell.
Fig. 3 is the structural representation of the utility model spring top board.
Fig. 4 is the structural representation of the utility model housing shrouding.
Fig. 5 is the structural representation of the utility model moisture expantion block.
Description of reference numerals:
1-1-inner casing; 1-2-mesochite; 1-3-shell;
1-4-base plate; 2-1-spring; 2-2-top board;
3-housing shrouding; 4-moisture expantion block; 5-light grating;
6-the first through hole; 7-the second through hole; 8-third through-hole;
9-fourth hole; 10-the three via hole; 11-the first via hole;
12-the second via hole.
Embodiment
As shown in Figures 1 to 5, the utility model comprises three layers of post shell, light grating 5 and the spring top board be arranged in described three layers of post shell, described three layers of post shell are by base plate 1-4, shell 1-3, mesochite 1-2 and inner casing 1-1 forms, described shell 1-3, mesochite 1-2 and the equal both ends open of inner casing 1-1, described shell 1-3, mesochite 1-2 is all fixedly connected with base plate 1-4 with the bottom of inner casing 1-1, described mesochite 1-2 is concordant with the top of inner casing 1-1, the top of described shell 1-3 protrudes from the top of mesochite 1-2, described shell 1-3 and mesochite 1-2 all has multiple first through hole 6, described base plate 1-4 has multiple second through hole 7, moisture expantion block 4 is closely filled with between described mesochite 1-2 and inner casing 1-1, described spring top board is made up of top board 2-2 and spring 2-1, described spring 2-1 to be arranged between shell 1-3 and mesochite 1-2 and can free-extension, described top board 2-2 is arranged on the top of mesochite 1-2 and can slides along the inwall of shell 1-3, the bottom of described spring 2-1 contacts with base plate 1-4, the top of described spring 2-1 contacts with top board 2-2, the center of described base plate 1-4 has the first via hole 11, the center of described top board 2-2 has the second via hole 12, the bottom of described light grating 5 is successively through the second via hole 12, inner casing 1-1 and the first via hole 11 and can in inner casing 1-1 free-extension, described light grating 5 is all fixedly connected with base plate 1-4 with top board 2-2, described top board 2-2 has multiple third through-hole 8.
As shown in Figure 1 and Figure 4, the top of described shell 1-3 is provided with housing shrouding 3, described housing shrouding 3 is arranged in shell 1-3, and described housing shrouding 3 has multiple fourth hole 9, and the center of described housing shrouding 3 has the 3rd via hole 10 passed for light grating 5 top.Housing shrouding 3 pairs of humidity sensors shield, and prevent a large amount of dust from entering three layers of post shell to affect accuracy of detection, and the hydrone in environment enter moisture expantion block 4 by fourth hole 9, improves the moisture absorption efficiency of moisture expantion block.
In the present embodiment, the shape of cross section of described light grating 5 is circular, and described first via hole 11 and the second via hole 12 are circular hole, and the diameter of described first via hole 11, second via hole 12 and the 3rd via hole 10 is all greater than the diameter of light grating 5.
In the present embodiment, described light grating 5 all welds with top board 2-2 and base plate 1-4, to guarantee connection reliability.
In the present embodiment, described spring 2-1 is cylindrical spring, and the shape of cross section of described shell 1-3, mesochite 1-2 and inner casing 1-1 is annular, and the external diameter of described spring 2-1 is less than the internal diameter of shell 1-3, and the internal diameter of described spring 2-1 is greater than the external diameter of mesochite 1-2.
In the present embodiment, the bottom of described spring 2-1 is connected with base plate 1-4, and the top of described spring 2-1 is connected with top board 2-2.
In the present embodiment, described moisture expantion block 4 is polyimide block.
In the present embodiment, the length of described shell 1-3 perforate part is equal with the length of mesochite 1-2 perforate part, to guarantee that spring 2-1 can slide along the inwall of shell 1-3 smoothly.
As shown in Figures 1 to 4, multiple first through hole 6 is evenly arranged, and multiple second through hole 7 is evenly arranged, and multiple third through-hole 8 is evenly arranged, and multiple fourth hole 9 is evenly arranged, and moisture expantion block 4 moisture absorption is even, and then improves accuracy of detection.
Process of installing and using of the present utility model is: under dry air environment, moisture expantion material (being described for polyimide) is filled between mesochite 1-2 and inner casing 1-1, formation moisture expantion block 4 (as shown in Figure 5) after solidification, should repeatedly fill and solidification makes hygroscopic material be full of between mesochite 1-2 and inner casing 1-1 as far as possible; By second via hole 12 of light grating 5 through spring top board, and light grating 5 is fixedly connected with top board 2-2; Light grating 5 passes from base plate 1-4 through after the inner casing 1-1 of three layers of post shell, and spring 2-1 is installed between shell 1-3 and mesochite 1-2, and the bottom of spring 2-1 contacts with base plate 1-4; Micro-bottom of drawing light grating 5, makes spring 2-1 be in mild compression state, is fixedly connected with by light grating 5 after fixing with base plate 1-4.Hydrone in environment enters moisture expantion block 4 by the first through hole 6 and the second through hole 7, can expand after moisture expantion block 4 absorbs moisture, upwards push up coping 2-2, pull fiber grating 5 to make fiber grating 5 inside that STRESS VARIATION occur, carried out the detection of ambient humidity by the wave length shift of fiber grating 5.
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 (9)
1. a bulk material moisture expantion fiber bragg grating temperature sensor, it is characterized in that: comprise three layers of post shell, light grating (5) and the spring top board be arranged in described three layers of post shell, described three layers of post shell are by base plate (1-4), shell (1-3), mesochite (1-2) and inner casing (1-1) composition, described shell (1-3), mesochite (1-2) and inner casing (1-1) all both ends opens, described shell (1-3), mesochite (1-2) is all fixedly connected with base plate (1-4) with the bottom of inner casing (1-1), described mesochite (1-2) is concordant with the top of inner casing (1-1), the top of described shell (1-3) protrudes from the top of mesochite (1-2), described shell (1-3) and mesochite (1-2) all have multiple first through hole (6), described base plate (1-4) has multiple second through hole (7), moisture expantion block (4) is closely filled with between described mesochite (1-2) and inner casing (1-1), described spring top board is made up of top board (2-2) and spring (2-1), described spring (2-1) to be arranged between shell (1-3) and mesochite (1-2) and can free-extension, described top board (2-2) is arranged on the top of mesochite (1-2) and can slides along the inwall of shell (1-3), the bottom of described spring (2-1) contacts with base plate (1-4), the top of described spring (2-1) contacts with top board (2-2), the center of described base plate (1-4) has the first via hole (11), the center of described top board (2-2) has the second via hole (12), the bottom of described light grating (5) is successively through the second via hole (12), inner casing (1-1) and the first via hole (11) and can in inner casing (1-1) free-extension, described light grating (5) is all fixedly connected with base plate (1-4) with top board (2-2), described top board (2-2) has multiple third through-hole (8).
2. according to a kind of bulk material moisture expantion fiber bragg grating temperature sensor according to claim 1, it is characterized in that: the top of described shell (1-3) is provided with housing shrouding (3), described housing shrouding (3) is arranged in shell (1-3), described housing shrouding (3) has multiple fourth hole (9), and the center of described housing shrouding (3) has the 3rd via hole (10) passed for light grating (5) top.
3. according to a kind of bulk material moisture expantion fiber bragg grating temperature sensor according to claim 2, it is characterized in that: the shape of cross section of described light grating (5) is for circular, described first via hole (11) and the second via hole (12) are circular hole, and the diameter of described first via hole (11), the second via hole (12) and the 3rd via hole (10) is all greater than the diameter of light grating (5).
4. according to a kind of bulk material moisture expantion fiber bragg grating temperature sensor according to claim 3, it is characterized in that: described light grating (5) is all welded with top board (2-2) and base plate (1-4).
5. according to a kind of bulk material moisture expantion fiber bragg grating temperature sensor described in claim 1 or 2, it is characterized in that: described spring (2-1) is cylindrical spring, the shape of cross section of described shell (1-3), mesochite (1-2) and inner casing (1-1) is annular, the external diameter of described spring (2-1) is less than the internal diameter of shell (1-3), and the internal diameter of described spring (2-1) is greater than the external diameter of mesochite (1-2).
6. according to a kind of bulk material moisture expantion fiber bragg grating temperature sensor described in claim 1 or 2, it is characterized in that: the bottom of described spring (2-1) is connected with base plate (1-4), the top of described spring (2-1) is connected with top board (2-2).
7. according to a kind of bulk material moisture expantion fiber bragg grating temperature sensor described in claim 1 or 2, it is characterized in that: described moisture expantion block (4) is polyimide block.
8. according to a kind of bulk material moisture expantion fiber bragg grating temperature sensor described in claim 1 or 2, it is characterized in that: the length of described shell (1-3) perforate part is equal with the length of mesochite (1-2) perforate part.
9. according to a kind of bulk material moisture expantion fiber bragg grating temperature sensor according to claim 2, it is characterized in that: multiple first through hole (6) is evenly arranged, multiple second through hole (7) is evenly arranged, multiple third through-hole (8) is evenly arranged, and multiple fourth hole (9) is evenly arranged.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420529111.7U CN204064894U (en) | 2014-09-15 | 2014-09-15 | A kind of bulk material moisture expantion fiber bragg grating temperature sensor |
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| CN201420529111.7U CN204064894U (en) | 2014-09-15 | 2014-09-15 | A kind of bulk material moisture expantion fiber bragg grating temperature sensor |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104569305A (en) * | 2014-12-22 | 2015-04-29 | 苏州工业园区传世汽车电子有限公司 | Gas sensor triple protection cover |
| CN105544387A (en) * | 2016-01-19 | 2016-05-04 | 江苏三川智能科技有限公司 | Anchor head moisture absorbing and monitoring device |
| CN106643911A (en) * | 2017-02-09 | 2017-05-10 | 北京航天控制仪器研究所 | Fiber grating temperature-humidity sensor package structure |
| 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 |
-
2014
- 2014-09-15 CN CN201420529111.7U patent/CN204064894U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104569305A (en) * | 2014-12-22 | 2015-04-29 | 苏州工业园区传世汽车电子有限公司 | Gas sensor triple protection cover |
| CN105544387A (en) * | 2016-01-19 | 2016-05-04 | 江苏三川智能科技有限公司 | Anchor head moisture absorbing and monitoring device |
| CN106643911A (en) * | 2017-02-09 | 2017-05-10 | 北京航天控制仪器研究所 | Fiber grating temperature-humidity sensor package structure |
| CN106643911B (en) * | 2017-02-09 | 2019-02-15 | 北京航天控制仪器研究所 | A kind of fiber grating Temperature Humidity Sensor encapsulating structure |
| 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 |
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Granted publication date: 20141231 Termination date: 20150915 |
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