CN109990723A - A kind of reusable flush type grating measuring device - Google Patents
A kind of reusable flush type grating measuring device Download PDFInfo
- Publication number
- CN109990723A CN109990723A CN201811455606.9A CN201811455606A CN109990723A CN 109990723 A CN109990723 A CN 109990723A CN 201811455606 A CN201811455606 A CN 201811455606A CN 109990723 A CN109990723 A CN 109990723A
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- marmem
- measuring device
- flush type
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- block
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
- G01B11/165—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge by means of a grating deformed by the object
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- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention belongs to and Fiber Grating Sensors Technology field, more particularly, to a kind of reusable flush type grating measuring device；Including fiber grating string, the fiber grating string is connected in series by several fiber gratings；It further include marmem block, hot-wire coil and PVC insulating gum cover, the PVC insulating gum cover is wrapped in marmem block surface；The hot-wire coil is embedded in inside marmem in advance, and the both ends of hot-wire coil are stretched out outside marmem；Spacer sleeve is equipped with multiple marmems on the fiber grating string.A kind of reusable flush type grating measuring device provided by the invention, by being arranged marmem on fiber grating string, when production, should be restored to expand when room temperature, be convenient for assembly or disassembly, can be used repeatedly by hot compression.
Description
Technical field
The invention belongs to and Fiber Grating Sensors Technology field, more particularly, to a kind of reusable embedment
Formula grating measuring device.
Background technique
Fiber grating is in the application of monitoring structural health conditions, and how effective use fiber-optic grating sensor is always to study
Hot and difficult issue.Fiber-optic grating sensor is at high price, need to realize when use or engineering are applied in practice in the lab to biography
The reuse of sensor.Since existing research is mainly packaged fiber grating using Materials with High Strength, so surface mount
Fiber-optic grating sensor rate of recovery after special package or mechanical anchor can achieve 90%, and pass through the flush type of encapsulation
The fiber-optic grating sensor rate of recovery is still less than 30%, up to a hundred yuans of the fiber-optic grating sensor cost of single measuring point, serious waste
Financial resource and material resource.Therefore, it is necessary to the optical fiber strings to flush type to be processed, it is ensured that optical fiber light is embedded to inside concrete structure
After grid string, its rate of recovery can be improved, to reduce cost.
Summary of the invention
The present invention in order to overcome at least one of the drawbacks of the prior art described above, provides a kind of reusable flush type
Grating measuring device can be embedded to in the preserved pipeline in geodesic structure, and can dismantle at any time, reuse.
In order to solve the above technical problems, the technical solution adopted by the present invention is that: a kind of reusable flush type grating
Measuring device, including fiber grating string, the fiber grating string are connected in series by several fiber gratings；It further include shape note
Recall alloy block, hot-wire coil and PVC insulating gum cover, the PVC insulating gum cover is wrapped in marmem block surface；It is described
Hot-wire coil be embedded in inside marmem block in advance, the both ends of hot-wire coil are stretched out outside marmem block；Described
Spacer sleeve is equipped with multiple marmem blocks on fiber grating string.
The present invention is based on existing cascaded fiber gratings to improve design, using marmem block in different temperatures
Under shape memory function, first equal-sized marmem block is evenly arranged on fiber grating string, then by logical
Electric coil changes the temperature of marmem block, can reserve fiber grating string in concrete knot by being frictionally held in
In the sheet-metal duct of structure, furthermore, it is possible to fiber grating string be dismantled or reinforce at any time, to reach the mesh of monitoring inside concrete strain
's.
In the present invention, marmem block be detachably secured on fiber grating string, be suitable for multichannel and
The form of different sensors density can be used for the monitoring of medium texture internal strain.
Further, the marmem block is sheathed between two neighboring fiber grating；Each adjacent two shape
The spacing distance of shape memory alloys block is not less than 5cm.
It further, further include PVC board, multiple marmem blocks are each attached in PVC board, and at fiber grating string
In tensional state.Fiber grating string is in tensional state and can more accurately measure.
Further, the middle part of the marmem block is equipped with through-hole, and ceramics pipe outer, institute are equipped in through-hole
The fiber grating stated is arranged in ceramics pipe outer；Heat-insulated asbestos are filled between grating fibers and ceramics pipe outer.It is powered
Coil gives marmem block to heat in the energized state, and so that marmem block is heated, deformation occurs；Setting insulation pottery
Porcelain tube and heat-insulated asbestos can completely cut off temperature, avoid during heating fiber grating string be also heated, and interfere；In addition,
Insulating ceramics also plays the effect of protection fiber grating string, when marmem block being avoided to be thermally deformed, to fiber grating
String damages.
Preferably, the hot-wire coil is helically wound around inside marmem block.Hot-wire coil helical disk
It is wound in marmem block, heating effect is more preferable.
Preferably, the winding circle number of the hot-wire coil is not less than 10 circles.More its of circle number of hot-wire coil adds
Thermal effect is better.
Preferably, the PVC insulating gum cover outer surface is equipped with the bulge-structure for increasing friction force.It is using
When, heated shape memory alloy block after first hot-wire coil is powered, marmem block deformation, volume becomes smaller, then will be whole
A fiber grating measuring device stretches in the preserved pipeline to geodesic structure；After stopping heating, marmem block restores
Room temperature, volume expansion, the outside face of marmem block contacts generation with the inner wall of pipeline and mutually contradicts pressure, to make whole
A fiber grating measuring device is fixed in preserved pipeline；Bulge-structure is arranged in marmem block surface, it is possible to increase shape
Frictional force between memorial alloy block and inner wall of the pipe enables more firm being located at of entire grating fibers measuring device to reserve
In pipeline.
Further, it is connected in series between the hot-wire coil in multiple marmem blocks.When in use, it is only necessary to will
One of hot-wire coil is powered, and the hot-wire coil in each marmem block is all powered, simple to operate.
Preferably, the marmem block is ellipsoidal configuration or cylindrical structure；The through-hole is set
At the central axes of cylindrical body or at ellipsoidal long axis.It when in use, is first preserved pipeline, shape in geodesic structure
Memorial alloy block is set as ellipsoid or cylindrical structure and more matches with pipeline configuration.
Preferably, the marmem block is Ti-Ni alloy.Ti-Ni alloy is at low cost, and deformation effects are good.
Compared with prior art, beneficial effect is: a kind of reusable flush type grating measuring provided by the invention
Device should be restored to expand when room temperature, just when production by the way that marmem block is arranged on fiber grating string by hot compression
In assembly or disassembly, can be used repeatedly.
Detailed description of the invention
Fig. 1 is 1 grating measuring device overall structure diagram of the embodiment of the present invention.
Fig. 2 is 1 marmem of the embodiment of the present invention and fiber grating string connection schematic diagram.
Fig. 3 is 2 grating measuring device overall structure diagram of the embodiment of the present invention.
Fig. 4 is 2 marmem of the embodiment of the present invention and fiber grating string connection schematic diagram.
Fig. 5 is that 2 marmem of the embodiment of the present invention and fiber grating series winding connect perspective view.
Specific embodiment
Attached drawing only for illustration, is not considered as limiting the invention；In order to better illustrate this embodiment, attached
Scheme certain components to have omission, zoom in or out, does not represent the size of actual product；To those skilled in the art,
The omitting of some known structures and their instructions in the attached drawings are understandable.Being given for example only property of positional relationship is described in attached drawing
Illustrate, is not considered as limiting the invention.
Embodiment 1:
As depicted in figs. 1 and 2, this part includes that marmem block 2, energization copper coil 3 and fiber grating string 1 form.Its
In, marmem block 2(Ti-Ni alloy SMA) ellipsoid of the shape for 20 × 20 × 40mm, the deep simultaneously spiral shell of energization copper coil 3
Rotation is wound in the inside of marmem block 2, and winding circle number is not less than 10, and in 2 outer surface PVC of marmem block
Insulating gum cover 4 wraps up, the frictional force that PVC gum cover outer surface is made into serrated appearance face to increase it with inner wall of the pipe；Adjacent two
The middle part of a fiber grating passes through marmem block 2, and 6 pipe of insulating ceramics by wall thickness not less than 3mm is mounted in shape
Thin 7 thermal insulation layer of asbestos is arranged in the inside of shape memory alloys block 2 between ceramic tube and fiber grating；And guarantee at fiber grating
In tensional state.The layout density of marmem block 2 must not be lower than 5cm mono-, and overall quantity should not be greater than 21, sensing
Device total length is no more than 3m.
Application method:
In advance in concrete structure pouring, the pvc pipe or thin-walled of 3.5GPa are not higher than using elasticity modulus according to structure operating condition
The form buried in copper pipe waits concrete structure initial set heat release, and pipeline is combined closely with concrete structure, and can be with the accurate transmission
At the time of strain (after 48 hours).
Single line is connected in grating measuring device end and connects a piston (piston diameter and pipe in the other end of fishing line
Road internal diameter is identical), by grating measuring device electrified regulation, makes marmem block 2 is heated to become smaller, then pass through preserved pipeline
One end, and goed deep into taking out air inside pipeline outward with identical piston in the preserved pipeline other end, it is every to take out one section of air driven company
The piston for connecing grating measuring device moves forward a distance until grating measuring device main body is arranged in inside configuration, and leads to
It crosses nozzle fixture and gives certain prestressing force.After, cut off power supply, wait after the cooling expansion of marmem block 2 with knot
Structure anchoring is close, can start to measure.It after measurement, is powered and waits marmem block 2 is heated to reduce, confirmation grating is surveyed
It after measuring device loosening, slowly pulls it, in case next time uses.
It is whole memorial alloy the present invention relates to marmem block 2, main composition is Ti-Ni alloy, should be by when production
Hot compression is restored to expand when room temperature, convenient for assembly；SMA is controlled using spiral electric method inside marmem block 2
Volume, convenient for control；Ceramics are set between marmem block 2 and fiber grating and asbestos 7 are used to radiate every electricity, it can
To reduce interference
Embodiment 2
This part includes 2 grid of marmem block, energization copper coil 3, concrete package cover and the fine and close optical fiber light of 100mm
Grid string 1.And intensive fiber grating quantity according to actual needs, utilize the small-scale strain of the accurate monitoring of structures of mechanical snap power
, it is reusable.
The 2 grid section of 100mm marmem block that this part is related to be radius be no more than 10mm, structure type be every
In PVC board upper mounted shape memory alloys grid, 2 grid size of marmem block is diameter 10mm and with a thickness of 2mm 20mm
Circular slab, making material is all made of Ti-Ni alloy SMA；PVC board is located at the middle part of 2 grid of marmem block, by it
Lattice are upper and lower two semicircles.Energization copper coil 3 passes through PVC board and hovers above the interior of the lower half circle of 2 grid of marmem block
Insulating ceramics 6 is arranged in 2 grid of marmem block, hot-wire coil 3 is separated with fiber grating for portion；And in shape
The upper outer surface of 2 grid of memorial alloy block is wrapped up with PVC insulating gum cover 4, and the middle part of two neighboring fiber grating is remembered across shape
Recall 2 grid of alloy block and is pasted on PVC board surface；2 grid of marmem block and PVC board binder-treatment, and guarantee optical fiber
Grating is in tensional state.
Application method:
In advance in concrete structure pouring, the pvc pipe or thin-walled of 3.5GPa are not higher than using elasticity modulus according to structure operating condition
The form buried in copper pipe waits concrete structure initial set heat release, and pipeline is combined closely with concrete structure, and can be with the accurate transmission
At the time of strain (after suitable 48 hours).
By grating measuring device electrified regulation, makes 2 grid of marmem block is heated to become smaller, then pass through provided pipe
Grating measuring device main body is arranged in inside configuration, and gives certain prestressing force by nozzle fixture by road.After, it cuts
It is close with structure anchor after waiting marmem block 2 is cooling to expand except power supply, it can start to measure.After measurement, lead to
Electricity waits marmem block 2 is heated to reduce, and after confirmation grating measuring device loosens, slowly pulls it, in case next time makes
With.
A kind of reusable flush type grating measuring device provided by the invention, compact structure are suitable for strain field
Monitoring.Using flake shape memorial alloy grid, and in the internal volume using spiral electric method control SMA, convenient for control
System.
Obviously, the above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be pair
The restriction of embodiments of the present invention.For those of ordinary skill in the art, may be used also on the basis of the above description
To make other variations or changes in different ways.There is no necessity and possibility to exhaust all the enbodiments.It is all this
Made any modifications, equivalent replacements, and improvements etc., should be included in the claims in the present invention within the spirit and principle of invention
Protection scope within.
Claims (10)
1. a kind of reusable flush type grating measuring device, including fiber grating string (1), the fiber grating string
(1) it is connected in series by several fiber gratings；It is characterized in that, further include marmem block (2), hot-wire coil (3) and
PVC insulating gum cover (4), the PVC insulating gum cover (4) are wrapped in marmem block (2) surface；The hot-wire coil
(3) it is embedded in marmem block (2) inside in advance, marmem block (2) are stretched out outside in the both ends of hot-wire coil (3)；It is described
Fiber grating string (1) on spacer sleeve be equipped with multiple marmem blocks (2).
2. a kind of reusable flush type grating measuring device according to claim 1, which is characterized in that described
Marmem block (2) is sheathed between two neighboring fiber grating；The interval of each adjacent two marmem block (2)
Distance is not less than 5cm.
3. a kind of reusable flush type grating measuring device according to claim 2, which is characterized in that further include
PVC board (5), multiple marmem blocks (2) are each attached on PVC board (5), and fiber grating string (1) is in tensional state.
4. a kind of reusable flush type grating measuring device according to claim 3, which is characterized in that described
The middle part of marmem block (2) is equipped with through-hole, and insulating ceramics (6) are equipped in through-hole and are managed, the fiber grating is worn
In in insulating ceramics (6) pipe；Heat-insulated asbestos (7) are filled between grating fibers and insulating ceramics (6) pipe.
5. a kind of reusable flush type grating measuring device according to claim 4, which is characterized in that described
It is internal that hot-wire coil (3) is helically wound around marmem block (2).
6. a kind of reusable flush type grating measuring device according to claim 5, which is characterized in that described
The winding circle number of hot-wire coil (3) is not less than 10 circles.
7. a kind of reusable flush type grating measuring device according to claim 5, which is characterized in that described
PVC insulating gum cover (4) outer surface is equipped with the bulge-structure for increasing friction force.
8. according to a kind of described in any item reusable flush type grating measuring devices of claim 4 to 7, feature exists
In being connected in series between the hot-wire coil (3) in multiple marmem blocks (2).
9. a kind of reusable flush type grating measuring device according to claim 8, which is characterized in that described
Marmem block (2) is ellipsoidal configuration or cylindrical structure；The through-hole is set at the central axes of cylindrical body or ellipse
At the long axis of circle.
10. a kind of reusable flush type grating measuring device according to claim 8, which is characterized in that described
Marmem block (2) be Ti-Ni alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811455606.9A CN109990723B (en) | 2018-11-30 | 2018-11-30 | Reusable embedded type grating measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811455606.9A CN109990723B (en) | 2018-11-30 | 2018-11-30 | Reusable embedded type grating measuring device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109990723A true CN109990723A (en) | 2019-07-09 |
| CN109990723B CN109990723B (en) | 2021-01-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811455606.9A Active CN109990723B (en) | 2018-11-30 | 2018-11-30 | Reusable embedded type grating measuring device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111521126A (en) * | 2020-04-28 | 2020-08-11 | 兰州大学 | Fiber grating sensing monitoring method for three-dimensional reconstruction of submarine pipeline |
| CN115655091A (en) * | 2022-10-19 | 2023-01-31 | 秦皇岛市政建设集团有限公司 | Assembled beam column node deformation early warning monitoring devices |
| CN116876264A (en) * | 2023-07-11 | 2023-10-13 | 浙江大学 | Intelligent geotechnical fiber grille, processing method and digital twin manufacturing platform |
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| CN115655091A (en) * | 2022-10-19 | 2023-01-31 | 秦皇岛市政建设集团有限公司 | Assembled beam column node deformation early warning monitoring devices |
| CN116876264A (en) * | 2023-07-11 | 2023-10-13 | 浙江大学 | Intelligent geotechnical fiber grille, processing method and digital twin manufacturing platform |
| CN116876264B (en) * | 2023-07-11 | 2023-12-12 | 浙江大学 | Intelligent geotechnical fiber grille, processing method and digital twin manufacturing platform |
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| CN109990723B (en) | 2021-01-12 |
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