CN219935074U - Fiber bragg grating weighing balance with multi-cantilever structure - Google Patents
Fiber bragg grating weighing balance with multi-cantilever structure Download PDFInfo
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- CN219935074U CN219935074U CN202321367872.2U CN202321367872U CN219935074U CN 219935074 U CN219935074 U CN 219935074U CN 202321367872 U CN202321367872 U CN 202321367872U CN 219935074 U CN219935074 U CN 219935074U
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- cantilever
- fiber grating
- cantilever beam
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- 239000000835 fiber Substances 0.000 title claims abstract description 75
- 238000005303 weighing Methods 0.000 title claims abstract description 32
- 239000010453 quartz Substances 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 229910000679 solder Inorganic materials 0.000 claims description 4
- 239000013307 optical fiber Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 description 9
- 230000035945 sensitivity Effects 0.000 description 6
- 238000005259 measurement Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
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Abstract
The utility model discloses a fiber bragg grating weighing balance with a multi-cantilever structure, which comprises a frame, a weighing unit and a tray, wherein the weighing unit comprises a plurality of cantilever beams; the optical fiber gratings are respectively arranged on the top surface or the bottom surface of each cantilever beam; and the support rods are used for suspending the tray below each cantilever beam, and in daily use, the error is counteracted by adopting the technical scheme, setting the cantilever beams and the fiber gratings and substituting the deformation data of the fiber gratings into a formula.
Description
Technical Field
The utility model relates to a fiber bragg grating weighing balance with a multi-cantilever structure.
Background
The existing fiber grating weighing balance is generally provided with only one fiber grating, the fiber grating is easily influenced by the external environment temperature and the strain, and the central wavelength of the fiber grating is correspondingly changed under the action of the temperature and the strain, so that the weighing accuracy is influenced, and the improvement is necessary.
Disclosure of Invention
The utility model aims to solve one of the technical problems existing in the prior art.
The utility model provides a fiber bragg grating weighing balance with a multi-cantilever structure, which comprises a frame, a weighing unit and a tray, wherein the weighing unit comprises:
the cantilever beams are symmetrically arranged on the frame;
the pair of fiber gratings are respectively arranged on the top surfaces or the bottom surfaces of the pair of cantilever beams;
and the pair of struts are used for suspending the tray below the pair of cantilever beams.
The cantilever beams are four, are fixedly arranged on the frame in a cross shape, and correspondingly, the fiber bragg gratings and the supporting rods are also provided with four.
The four cantilever beams are in a group of two pairs, two cantilever beams in each group of cantilever beams are positioned on the same axis, and the axes of the two groups of cantilever beams are in an orthogonal state.
One of the symmetrical fiber gratings is positioned above the corresponding cantilever beam, and the other fiber grating is positioned below the corresponding cantilever beam.
The weighing unit further comprises:
the grooves are respectively arranged on the top surface or the bottom surface of each cantilever beam;
and a plurality of fixing points for mounting each fiber bragg grating in a corresponding groove.
The grating area of each fiber bragg grating is positioned at the frame end of the corresponding cantilever Liang Kaojin, and each supporting rod is respectively arranged at the outer end of the corresponding cantilever beam.
Each fixed point is respectively positioned at two ends of the grating region of the corresponding fiber bragg grating.
The fixed point is a low temperature quartz solder package.
The fiber grating arranged on the upper surface of the cantilever beam is only slightly pre-tensioned, and the pre-tensioned value of the fiber grating arranged on the lower surface of the cantilever beam is required to be larger than the full-scale output of the measuring range.
The frame includes:
a base;
the upright post is fixedly arranged on the base;
the cross beam is fixedly arranged at the upper end of the upright post;
the cantilever beam frame is arranged at the bottom of the cross beam and is square;
wherein, each cantilever beam is fixedly arranged on the cantilever beam frame.
1. The method comprises the steps of substituting deformation data of a pair of fiber gratings into a formula to calculate according to the arrangement of a pair of cantilever beams and a pair of fiber gratings, so that errors are eliminated;
2. by orthogonally arranging the two pairs of cantilever beams and the two pairs of fiber gratings, errors generated when the tray is inclined are eliminated, and the weighing precision is improved.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a fiber grating weighing balance with a multi-cantilever structure in embodiment 1 of the present utility model;
fig. 2 is a schematic diagram of the overall structure of a fiber grating weighing balance with a multi-cantilever structure in embodiment 2 of the present utility model.
Reference numerals
1-frame, 101-base, 102-stand, 103-crossbeam, 104-cantilever beam frame, 2-weighing unit, 201-cantilever beam, 202-fiber grating, 203-branch, 204-slot, 205-fixed point, 3-tray.
Detailed Description
The technical solutions of the embodiments of the present utility model will be clearly described below with reference to the drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. All other embodiments, which are obtained by a person skilled in the art based on the embodiments of the present utility model, fall within the scope of protection of the present utility model.
The terms first, second and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged, as appropriate, such that embodiments of the present utility model may be implemented in sequences other than those illustrated or described herein, and that the objects identified by "first," "second," etc. are generally of a type, and are not limited to the number of objects, such as the first object may be one or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/", generally means that the associated object is an "or" relationship.
The server provided by the embodiment of the utility model is described in detail below through specific embodiments and application scenes thereof with reference to the accompanying drawings.
Example 1:
as shown in fig. 1, an embodiment of the present utility model provides a fiber bragg grating weighing balance with a multi-cantilever structure, which comprises a frame 1, a weighing unit 2 and a tray 3, wherein the weighing unit 2 comprises a pair of cantilever beams 201, and is symmetrically installed on the frame 1; a pair of fiber gratings 202 respectively mounted on the top or bottom surfaces of the pair of cantilever beams 201; a pair of struts 203 for suspending the tray 3 under a pair of cantilever beams 201.
Preferably, one of the symmetrical fiber gratings 202 is located above the corresponding cantilever beam 201 and the other is located below the corresponding cantilever beam 201.
Further, the weighing unit 2 further includes a plurality of grooves 204 respectively disposed on the top surface or the bottom surface of each cantilever beam 201; a number of fixation points 205 for mounting each fiber grating 202 in a corresponding groove 204.
Preferably, the grating region of each fiber bragg grating 202 is located at the end of the corresponding cantilever beam 201 close to the frame 1, and each supporting rod 203 is respectively installed at the outer end of the corresponding cantilever beam 201.
Preferably, each fixed point 205 is located at two ends of the grating region of the corresponding fiber bragg grating 202.
Preferably, the anchor point 205 is a low temperature quartz solder package.
Preferably, the fiber grating 202 disposed on the upper surface of the cantilever beam 201 is pre-tensioned only a small amount, and the pre-tensioned value of the fiber grating 202 disposed on the lower surface of the cantilever beam 201 must be greater than the full-scale output of the measuring range.
Further, the rack 1 includes a base 101; a column 102 fixedly mounted on the base 101; a cross beam 103 fixedly mounted on the upper end of the column 102; the cantilever beam frames 104 are arranged at the bottoms of the cross beams 103 and are square, and each cantilever beam 201 is fixedly arranged on the cantilever beam frame 104.
In this embodiment of the present utility model, since the above-described configuration is adopted, the amounts of deformation measured by the pair of fiber gratings 202 are equal and opposite, and the influence of the temperature on each fiber grating 202 is the same, the arrangement is made:
Δλ 1 ＝K ε ε+K T ΔT
Δλ 2 ＝-K ε ε+K T ΔT
wherein Deltalambda is the central wavelength variation quantity of the fiber grating, K T Is the temperature sensitivity coefficient, K of the fiber bragg grating ε The strain sensitivity coefficient of the fiber bragg grating is epsilon, which is the strain quantity generated by the cantilever beam when the weight with the mass M is measured, and the strain quantity is in direct proportion to the mass, namely: m=k M ε，k M Is the mass sensitivity. Is arranged to obtain
I.e.
I.e. the measurement errors due to deformation of the fiber grating 202 caused by temperature are eliminated.
Example 2:
as shown in fig. 2, the embodiment of the utility model provides a fiber bragg grating weighing balance with a multi-cantilever structure, which comprises a frame 1, a weighing unit 2 and a tray 3, wherein the weighing unit 2 comprises a pair of cantilever beams 201 which are symmetrically arranged on the frame 1; a pair of fiber gratings 202 respectively mounted on the top or bottom surfaces of the pair of cantilever beams 201; a pair of struts 203 for suspending the tray 3 under a pair of cantilever beams 201.
Preferably, the cantilever beams 201 are four, are fixedly arranged on the frame 1 in a cross shape, and correspondingly, the fiber bragg gratings 202 and the supporting rods 203 are also provided with four.
Preferably, the four cantilever beams 201 are arranged in pairs, two cantilever beams 201 in each group of cantilever beams 201 are positioned on the same axis, and the axes of the two groups of cantilever beams 201 are in an orthogonal state.
Preferably, one of the symmetrical fiber gratings 202 is located above the corresponding cantilever beam 201 and the other is located below the corresponding cantilever beam 201.
Further, the weighing unit 2 further includes a plurality of grooves 204 respectively disposed on the top surface or the bottom surface of each cantilever beam 201; a number of fixation points 205 for mounting each fiber grating 202 in a corresponding groove 204.
Preferably, the grating region of each fiber bragg grating 202 is located at the end of the corresponding cantilever beam 201 close to the frame 1, and each supporting rod 203 is respectively installed at the outer end of the corresponding cantilever beam 201.
Preferably, each fixed point 205 is located at two ends of the grating region of the corresponding fiber bragg grating 202.
Preferably, the anchor point 205 is a low temperature quartz solder package.
Preferably, the fiber grating 202 disposed on the upper surface of the cantilever beam 201 is pre-tensioned only a small amount, and the pre-tensioned value of the fiber grating 202 disposed on the lower surface of the cantilever beam 201 must be greater than the full-scale output of the measuring range.
Further, the rack 1 includes a base 101; a column 102 fixedly mounted on the base 101; a cross beam 103 fixedly mounted on the upper end of the column 102; the cantilever beam frames 104 are arranged at the bottoms of the cross beams 103 and are square, and each cantilever beam 201 is fixedly arranged on the cantilever beam frame 104.
In this embodiment of the present utility model, since the above-mentioned structure is adopted, the fiber bragg gratings 202 are encapsulated on the upper and lower surfaces of four equal-strength cantilever beams 201 in two orthogonal directions of the cross shape, and the opposite pair of cantilever beams 201 extend along the x axis, and accordingly, the other two cantilever beams 201 extend along the y axis, and in an ideal case, the deformation amounts measured by the pair of fiber bragg gratings 202 extending along the x axis and the pair of fiber bragg gratings 202 extending along the y axis are equal, the directions are opposite, and the influence of the temperature on each fiber bragg grating 202 is the same, so that the following arrangement is obtained:
Δλ 1 ＝K ε ε+K T ΔT
Δλ 2 ＝-K ε ε+K T ΔT
Δλ 3 ＝K ε ε+K T ΔT
Δλ 4 ＝-K ε ε+K T ΔT
wherein Deltalambda is the central wavelength variation quantity of the fiber grating, K T Is the temperature sensitivity coefficient, K of the fiber bragg grating ε The strain sensitivity coefficient of the fiber bragg grating is epsilon, which is the strain quantity generated by the cantilever beam when the weight with the mass M is measured, and the strain quantity is in direct proportion to the mass, namely: m=k M ε，k M Is the mass sensitivity. Is arranged to obtain
I.e.
Considering measurement errors due to the inclination of the balance tray 3 or the weight, four cantilever beams 201 in two orthogonal directions respectively generate ± Δε x And + -Deltaε y Is arranged to obtain:
Δλ 1 ＝K ε (ε+Δε x )+K T ΔT
Δλ 2 ＝-K ε (ε-Δε x )+K T ΔT
Δλ 3 ＝K ε (ε+Δε y )+K T ΔT
Δλ 4 ＝-K ε (ε-Δε y )+K T ΔT
finishing still results in:
Δλ 1 -Δλ 2 +Δλ 3 -Δλ 4 ＝4K ε ε
namely, measurement errors caused by the inclination of the balance tray 3 or the weight and the deformation of the fiber grating 202 caused by the temperature are eliminated;
it should be noted that since the actual tilting direction of the tray 3 is not necessarily the same, tilting errors in all directions can be eliminated only if errors in two pairs of cantilever beams 201 in two orthogonal directions, respectively, can be eliminated.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. Furthermore, it should be noted that the scope of the methods and apparatus in the embodiments of the present utility model is not limited to performing the functions in the order shown or discussed, but may also include performing the functions in a substantially simultaneous manner or in an opposite order depending on the functions involved, e.g., the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.
The embodiments of the present utility model have been described above with reference to the accompanying drawings, but the present utility model is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present utility model and the scope of the claims, which are to be protected by the present utility model.
Claims (10)
1. The utility model provides a fiber bragg grating balance of many cantilever structures, includes frame (1), weighing cell (2) and tray (3), its characterized in that, weighing cell (2) include:
a pair of cantilever beams (201) symmetrically arranged on the frame (1);
a pair of fiber gratings (202) respectively mounted on the top or bottom surfaces of the pair of cantilever beams (201);
a pair of struts (203) for suspending the pallet (3) below the pair of cantilever beams (201).
2. The multi-cantilever structured fiber grating weighing balance of claim 1, wherein:
the cantilever beams (201) are four, are fixedly arranged on the frame (1) in a cross shape, and correspondingly, the fiber bragg gratings (202) and the supporting rods (203) are also provided with four.
3. The multi-cantilever structured fiber grating weighing balance of claim 2, wherein:
the four cantilever beams (201) are arranged in pairs, two cantilever beams (201) in each group of cantilever beams (201) are positioned on the same axis, and the axes of the two groups of cantilever beams (201) are in an orthogonal state.
4. A multi-cantilever structured fiber grating weigh scale according to claim 1 or 3, wherein:
one of the symmetrical fiber gratings (202) is located above the corresponding cantilever beam (201), and the other is located below the corresponding cantilever beam (201).
5. A multi-cantilever structured fiber grating weigh scale according to claim 4, wherein said weigh cell (2) further comprises:
the grooves (204) are respectively arranged on the top surface or the bottom surface of each cantilever beam (201);
-a number of fixation points (205) for mounting each of said fibre gratings (202) in a respective groove (204).
6. The multi-cantilever structured fiber grating weighing balance of claim 5, wherein:
the grating region of each fiber bragg grating (202) is positioned at the end, close to the rack (1), of the corresponding cantilever beam (201), and each supporting rod (203) is respectively arranged at the outer end of the corresponding cantilever beam (201).
7. The multi-cantilever structured fiber grating weighing balance of claim 6, wherein:
each fixed point (205) is respectively positioned at two ends of the grid region of the corresponding fiber grating (202).
8. The multi-cantilever structured fiber grating weighing balance of claim 7, wherein:
the fixed point (205) is a low temperature quartz solder package.
9. A multi-cantilever structured fiber grating weigh scale according to claim 5:
the fiber grating (202) arranged on the upper surface of the cantilever beam (201) is only slightly pre-tensioned, and the pre-tensioned value of the fiber grating (202) arranged on the lower surface of the cantilever beam (201) is required to be larger than the full-scale output of the measuring range.
10. A multi-cantilever structured fiber grating weighing balance according to claim 1, wherein the frame (1) comprises:
a base (101);
a column (102) fixedly mounted on the base (101);
the cross beam (103) is fixedly arranged at the upper end of the upright post (102);
the cantilever beam frame (104) is arranged at the bottom of the cross beam (103) and is square;
wherein each cantilever beam (201) is fixedly mounted on the cantilever beam frame (104).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321367872.2U CN219935074U (en) | 2023-05-31 | 2023-05-31 | Fiber bragg grating weighing balance with multi-cantilever structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321367872.2U CN219935074U (en) | 2023-05-31 | 2023-05-31 | Fiber bragg grating weighing balance with multi-cantilever structure |
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| Publication Number | Publication Date |
|---|---|
| CN219935074U true CN219935074U (en) | 2023-10-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321367872.2U Active CN219935074U (en) | 2023-05-31 | 2023-05-31 | Fiber bragg grating weighing balance with multi-cantilever structure |
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| CN (1) | CN219935074U (en) |
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- 2023-05-31 CN CN202321367872.2U patent/CN219935074U/en active Active
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