CN111366220A - Arch-shaped optical fiber weighing sensor - Google Patents
Arch-shaped optical fiber weighing sensor Download PDFInfo
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- CN111366220A CN111366220A CN202010371618.4A CN202010371618A CN111366220A CN 111366220 A CN111366220 A CN 111366220A CN 202010371618 A CN202010371618 A CN 202010371618A CN 111366220 A CN111366220 A CN 111366220A
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- optical fiber
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G3/00—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances
- G01G3/12—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing
- G01G3/125—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing wherein the weighing element is an optical member
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Abstract
The invention relates to an arch-shaped optical fiber weighing sensor structure, which comprises: the device comprises a cover plate, a deformable supporting angle component, a spring piece component and a fiber grating component; the deformable supporting angle assembly comprises four deformable supporting angles, and each deformable supporting angle is orthogonally arranged at the bottom of the cover plate and is fixed through screws; the spring piece assembly comprises two spring pieces, one of the spring pieces is fixedly arranged on the two opposite deformable supporting angles, the other spring piece is fixedly arranged on the other pair of the two opposite deformable supporting angles, and the two spring pieces are mutually orthogonal one above the other; the fiber grating component comprises two fiber gratings which are respectively fixedly arranged in the middle of the two spring pieces and used for measuring weight data. The invention has simple structure, ultrathin thickness, can prevent unbalance loading, is easy to adjust, integrates the advantages of the fiber bragg grating, and can be applied to strong electromagnetic interference and flammable and explosive environments to realize gravity sensing.
Description
Technical Field
The invention belongs to the technical field of sensing, particularly relates to a sensor, and particularly relates to an arch-shaped optical fiber weighing sensor.
Background
Nowadays, weighing sensors are increasingly used. In some scenarios where weight readings are required, the use of load cells is often desirable. A load cell is essentially a device that converts a weight signal into a measurable electrical signal output. The actual working environment of the sensor is considered firstly when the sensor is used, which is important for correctly selecting the weighing sensor, and the sensor is related to whether the sensor can work normally, the safety and the service life of the sensor, and even the reliability and the safety of the whole weighing apparatus.
At present, the known load cells are mainly based on electromagnetic technology. The sensor is generally large in thickness and complex in structure, and cannot be applied to weight detection in strong electromagnetic interference and flammable and explosive environments, such as oil and gas storage and transportation, military fire houses and other environments.
For example, a weighing sensor disclosed in chinese patent publication No. CN110132382A, which is based on electromagnetic technology, cannot be directly applied to flammable and explosive environments, and has a complicated structure. For example, the optical fiber weighing sensor disclosed in chinese patent publication No. CN202255574U utilizes a spring and an elastic sheet to transfer strain, so as to convert a mass signal into a measurable signal.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide an arch-shaped optical fiber weighing sensor, which has a simple structure, is convenient to manufacture and use, has an ultra-thin thickness, and can be applied to flammable and explosive environments.
In order to achieve the purpose, the invention adopts the following technical scheme: an arch-type fiber optic load cell structure, comprising: the device comprises a cover plate, a deformable supporting angle component, a spring piece component and a fiber grating component; the deformable supporting angle assembly comprises four deformable supporting angles, and each deformable supporting angle is orthogonally arranged at the bottom of the cover plate and is fixed through screws; the spring piece assembly comprises two spring pieces, one of the spring pieces is fixedly arranged on the two opposite deformable supporting angles, the other spring piece is fixedly arranged on the other pair of the two opposite deformable supporting angles, and the two spring pieces are mutually orthogonal one above the other; the fiber grating component comprises two fiber gratings which are respectively fixedly arranged in the middle of the two spring pieces and used for measuring weight data.
Furthermore, the cover plate is of a disc-shaped structure, and a positioning screw hole for mounting the deformable supporting angle component is formed in the bottom of the cover plate.
Furthermore, the deformable supporting angles have the same structure and respectively comprise a locking structure connecting end, a spring piece connecting end and a deformation structure arranged between the locking structure connecting end and the spring piece connecting end; the locking structure is arranged on the connecting end of the locking structure, matched with the locking sheet and used for mounting a bearing to reduce the friction force between the bearing and the ground; the connecting end of the spring piece is provided with a rectangular groove for fixing the spring piece; the deformation structure is provided with a positioning screw hole groove, the positioning screw hole groove is provided with a positioning screw hole used for being connected with the cover plate bolt, the edges of two grooves at the joint of the positioning screw hole groove and the connecting end of the spring piece are not in contact, and the upper surface and the lower surface of the joint of the positioning screw hole groove and the connecting end of the locking structure are respectively provided with a deformation groove.
Furthermore, the locking piece comprises a bearing positioning convex groove and two connecting ends connected to two ends of the bearing positioning convex groove, and the two connecting ends are provided with positioning screw holes used for being connected with the locking structure through bolts.
Furthermore, the two spring pieces have the same structure, and the middle part of each spring piece is provided with a spring structure for increasing the strain generated when the spring pieces are stressed; the spring structure is characterized in that an optical fiber fixing groove for fixing the optical fiber grating is formed in the middle of the spring structure, and the optical fiber grating is fixed in the optical fiber fixing groove through optical fiber fixing glue.
Furthermore, the two fiber gratings have the same structure and both adopt fiber devices with a grid structure.
Furthermore, the fiber bragg grating adopts a fiber bragg grating, an inclined fiber bragg grating or a long-period fiber bragg grating.
Further, the gravity F measured by the arch-shaped optical fiber weighing sensor is as follows:
F＝(Fa+Fb)
wherein, FaAnd FbThe gravity is measured for two fiber gratings respectively, and there are:
Δλa＝ηFa
Δλb＝ηFb
in the formula, Δ λaAnd Δ λbThe lateral strain of the two fiber gratings respectively, and η is the mechanical sensitivity coefficient for converting gravity into lateral strain.
Due to the adoption of the technical scheme, the invention has the following advantages: 1. the invention is provided with the deformable supporting angle, and the structure is utilized to convert the longitudinal weight signal into the transverse strain change, and further the longitudinal signal is output as an electric signal through the fiber bragg grating, and the longitudinal signal is converted into the transverse signal, so that the sensor has ultrathin thickness and can be applied to a specific space environment. 2. The two optical fiber gratings which are orthogonally arranged can prevent unbalance loading, and the sensitivity can be adjusted by changing the depth of the deformation groove on the supporting angle according to requirements. 3. The invention adopts the fiber grating for measurement, the optical fiber sensor transmits information by using light waves, and the optical fiber is an electrically insulated and corrosion-resistant transmission medium, so the invention can be applied to the environments with strong electromagnetic interference, flammability and explosiveness for weighing, and has simple structure and easy processing.
Drawings
FIG. 1 is a perspective view of an arch-shaped optical fiber load cell of the present invention;
FIG. 2 is an overall structural view of the arch-shaped optical fiber weighing sensor of the invention;
FIG. 3 is a cover plate structure of an arch-shaped optical fiber weighing sensor;
FIG. 4 is a schematic view of a supporting angle structure of the arch-shaped optical fiber weighing sensor of the invention;
FIG. 5 is a cross-sectional view of the overall structure of an arch-shaped optical fiber weighing sensor;
FIG. 6 is a schematic structural diagram of a locking sheet of an arch-shaped optical fiber weighing sensor;
FIG. 7 is a schematic view of a spring leaf structure of an arch-shaped optical fiber weighing sensor;
the components in the drawings are numbered as follows:
1. a cover plate; 2. a deformable corner module; 21. a first deformable limb; 22. a second deformable limb; 23. a third deformable limb; 24. a fourth deformable limb; 3. a spring leaf assembly; 31. a first spring plate; 32. a second spring plate; 4. a rectangular groove; 5. a locking structure; 6. a first deformation groove; 7. a second deformation groove; 8. an optical fiber fixing groove; 9. locking sheets; 10. and positioning the screw hole.
Detailed Description
To facilitate understanding of those skilled in the art, the present invention will be further described with reference to the following embodiments and the accompanying drawings. The embodiments are not intended to limit the invention, and it is obvious that the described embodiments are only a part of the embodiments of the invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without inventive step, are within the scope of the present invention.
As shown in fig. 1 and fig. 2, the present invention provides an arch-shaped optical fiber weighing sensor structure, which includes a cover plate 1, a deformable supporting angle component 2, a spring leaf component 3 and a fiber grating component. The deformable supporting angle component 2 comprises four deformable supporting angles 21-24, and the deformable supporting angles 21-24 are orthogonally arranged at the bottom of the cover plate 1 and are fixed through screws; the spring plate assembly 3 comprises a first spring plate 31 and a second spring plate 32, wherein the first spring plate 31 is fixedly arranged on two opposite deformable support angles, such as the deformable support angle 22 and the deformable support angle 24, the second spring plate 32 is fixedly arranged on the other pair of opposite deformable support angles, such as the deformable support angle 21 and the deformable support angle 23, and is mutually orthogonal to the first spring plate 31 in a top-bottom manner; the fiber grating component comprises a first fiber grating and a second fiber grating, the first fiber grating is fixedly arranged in the middle of the first spring piece 31, and the second fiber grating is fixedly arranged in the middle of the second spring piece 32. When the device works, the cover plate 1 is stressed to press the deformable supporting angle component 2, the deformable supporting angle component 2 is transversely displaced to pull the spring piece component 3, and then the fiber grating component is pulled, and weight data are obtained through measurement of the fiber grating component.
Further, as shown in fig. 3, the cover plate 1 is a disc-shaped structure, and a positioning screw hole is formed at the bottom of the cover plate 1 for installing the supporting angle component.
Further, as shown in fig. 4 and 5, each deformable corner has the same structure, and includes a locking structure connecting end, a spring piece connecting end, and a deformation structure arranged between the two connecting ends; the locking structure 5 is arranged on the connecting end of the locking structure, and the locking structure 5 is matched with the locking sheet 9 and used for mounting a bearing to reduce the friction force between the bearing and the ground; the connecting end of the spring piece is provided with a rectangular groove 4 for fixing the spring piece; be provided with the location screw hole groove in the deformation structure, be provided with a plurality of location screws that are used for with apron 1 bolted connection in the location screw hole groove, and location screw hole groove and two recess edges of spring leaf link junction contactless, location screw hole groove and locking structure link junction upper and lower surface are provided with first deformation groove 6 and second deformation groove 7 respectively.
When putting the heavy object that gravity is F on apron 1, can push down the flexible angle, give the flexible angle with power transmission, flexible angle 2 has formed domes with apron 1, can produce the displacement at the horizontal direction after the vertical atress of flexible angle, two deformation grooves on the flexible angle play the effect of enlarging the displacement. The transverse displacement of the deformable supporting angle can pull the spring piece to generate displacement, so that the central wavelength of the fiber bragg grating on the spring piece is changed.
Further, as shown in fig. 6, the locking piece 9 includes a bearing positioning convex groove and two connecting ends connected to two ends of the bearing positioning convex groove, and the two connecting ends are provided with positioning screw holes for connecting with the locking structure 5 by bolts.
Further, as shown in fig. 7, the first spring plate 31 and the second spring plate 32 have the same structure, and a spring structure is disposed in the middle of each spring plate for increasing the strain generated when a force is applied; the middle part of the spring structure is provided with an optical fiber fixing groove 8 for fixing the optical fiber grating, and the optical fiber grating is fixed in the optical fiber fixing groove 8 by using optical fiber fixing glue.
Further, the fiber bragg grating is an optical fiber device having a grating structure, such as a fiber bragg grating, an inclined fiber bragg grating, a long-period fiber bragg grating, or the like.
When broadband light passes through the fiber grating, the light wave carrying the characteristic information of the grid structure can be reflected or transmitted, the light wave has corresponding characteristic wavelength, and when the temperature of the fiber grating changes or axial strain is generated, the characteristic wavelength of the fiber grating changes.
The wavelength of the fiber grating is linearly related to the strain, i.e. the fiber grating is linearly related to the gravity F in the application range, wherein Δ λ is η F, wherein η is the mechanical sensitivity coefficient of the fiber grating for converting the gravity into the transverse strain in the invention, and the weight measured by the fiber grating on the first spring plate 31 is FaTransverse strain Δ λaThe weight measured by the fiber grating on the second spring plate 32 is FbTransverse strain Δ λbThen measuredWeight is F ═ Fa+Fb) The optical fiber grating is orthogonally arranged and the algorithm is adopted, so that the influence of unbalance loading can be prevented.
Any feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving equivalent or similar purposes unless expressly stated otherwise, i.e. each feature is simply an example of a generic series of equivalent or similar features unless expressly stated otherwise.
The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed.
Claims (8)
1. An arch-shaped optical fiber weighing sensor structure is characterized by comprising:
the device comprises a cover plate, a deformable supporting angle component, a spring piece component and a fiber grating component;
the deformable supporting angle assembly comprises four deformable supporting angles, and each deformable supporting angle is orthogonally arranged at the bottom of the cover plate and is fixed through screws;
the spring piece assembly comprises two spring pieces, one of the spring pieces is fixedly arranged on the two opposite deformable supporting angles, the other spring piece is fixedly arranged on the other pair of the two opposite deformable supporting angles, and the two spring pieces are mutually orthogonal one above the other;
the fiber grating component comprises two fiber gratings which are respectively fixedly arranged in the middle of the two spring pieces and used for measuring weight data.
2. An arch-type optical fiber load cell structure as defined in claim 1, wherein: the cover plate is of a disc-shaped structure, and a positioning screw hole for mounting the deformable supporting angle component is formed in the bottom of the cover plate.
3. An arch-type optical fiber load cell structure as defined in claim 1, wherein: each deformable supporting angle has the same structure and comprises a locking structure connecting end, a spring piece connecting end and a deformation structure arranged between the locking structure connecting end and the spring piece connecting end;
the locking structure is arranged on the connecting end of the locking structure, matched with the locking sheet and used for mounting a bearing to reduce the friction force between the bearing and the ground;
the connecting end of the spring piece is provided with a rectangular groove for fixing the spring piece;
the deformation structure is provided with a positioning screw hole groove, the positioning screw hole groove is provided with a positioning screw hole used for being connected with the cover plate bolt, the edges of two grooves at the joint of the positioning screw hole groove and the connecting end of the spring piece are not in contact, and the upper surface and the lower surface of the joint of the positioning screw hole groove and the connecting end of the locking structure are respectively provided with a deformation groove.
4. An arch-type optical fiber load cell structure as defined in claim 3, wherein: the locking piece comprises a bearing positioning convex groove and two connecting ends connected to two ends of the bearing positioning convex groove, and the two connecting ends are provided with positioning screw holes used for being connected with locking structure bolts.
5. An arch-type optical fiber load cell structure as defined in claim 1, wherein: the two spring pieces have the same structure, and the middle parts of the spring pieces are provided with spring structures for increasing strain generated when the spring pieces are stressed; the spring structure is characterized in that an optical fiber fixing groove for fixing the optical fiber grating is formed in the middle of the spring structure, and the optical fiber grating is fixed in the optical fiber fixing groove through optical fiber fixing glue.
6. An arch-type optical fiber load cell structure as defined in claim 1, wherein: the two fiber gratings have the same structure and both adopt fiber devices with grid structures.
7. An arch-type optical fiber load cell structure as defined in claim 6, wherein: the fiber bragg grating is a fiber bragg grating, an inclined fiber bragg grating or a long-period fiber bragg grating.
8. An arch-type optical fiber load cell structure as defined in claim 1, wherein: the gravity F measured by the arch-shaped optical fiber weighing sensor is as follows:
F＝(Fa+Fb)
wherein, FaAnd FbThe gravity is measured for two fiber gratings respectively, and there are:
Δλa＝ηFa
Δλb＝ηFb
in the formula, Δ λaAnd Δ λbThe lateral strain of the two fiber gratings respectively, and η is the mechanical sensitivity coefficient for converting gravity into lateral strain.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010371618.4A CN111366220B (en) | 2020-05-06 | 2020-05-06 | Arch-shaped optical fiber weighing sensor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010371618.4A CN111366220B (en) | 2020-05-06 | 2020-05-06 | Arch-shaped optical fiber weighing sensor |
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| CN111366220A true CN111366220A (en) | 2020-07-03 |
| CN111366220B CN111366220B (en) | 2022-03-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113324632A (en) * | 2020-11-10 | 2021-08-31 | 西北工业大学 | Optical fiber weighing sensor |
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Cited By (2)
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| CN113324632B (en) * | 2020-11-10 | 2023-01-24 | 西北工业大学 | Optical fiber weighing sensor |
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| CN111366220B (en) | 2022-03-15 |
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