CN208026218U - A kind of optical fibre displacement sensor - Google Patents
A kind of optical fibre displacement sensor Download PDFInfo
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- CN208026218U CN208026218U CN201820387955.0U CN201820387955U CN208026218U CN 208026218 U CN208026218 U CN 208026218U CN 201820387955 U CN201820387955 U CN 201820387955U CN 208026218 U CN208026218 U CN 208026218U
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- pedestal
- optical fiber
- displacement sensor
- sliding rack
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Abstract
The utility model discloses a kind of optical fibre displacement sensors, by spiral winding optical fiber and in a manner of U-shaped revolution, wide range, the high-precision displacement sensor based on bending loss are obtained, the non-linear relation with light loss is measured in overcoming using this bending loss as traditional displacement meter of principle, it has broad application prospects, during use, increase the sensitivity of optical fibre displacement sensor, optical fiber is more uniformly stressed during the winding process, the range for increasing optical fibre displacement sensor has good use value.
Description
Technical field
The utility model belongs to structural safety monitoring equipment technical field, and in particular to a kind of optical fibre displacement sensor.
Background technology
For monitoring structural health conditions, displacement is mostly important one of monitoring physical quantity.Traditional electrical measurement displacement sensing
Device is fragile during carrying, calibration, Embedded installation and concrete vibrating since its anti-electromagnetic interference capability is weak, and measures
Error is often larger, it is difficult to realize long-term, stable and measure at a distance.And fibre optical sensor has bandwidth, anti-interference ability
By force, the advantages that light weight, small, corrosion-resistant, electrical insulating property are good and safe and reliable receives the extensive concern of domestic and foreign scholars.
The principle that fibre optical sensor is modulated in a fiber by light wave can be divided into：Intensity modulation type, phase modulation-type, partially
Several forms such as polarization state modulation type and wavelength modulation type.Optical fibre displacement sensor wherein based on bending loss of optical fiber principle belongs to
Intensity modulation type fibre optical sensor.Bending loss of optical fiber is caused by the bending radius of optical fiber is less than the critical bend radius of optical fiber
Added losses.In those early years, as bending loss of optical fiber is recognized by scholars, foreign countries have scholar to propose two kinds for monitoring
The distributed fiberoptic sensor of structural cracks can determine position and size that structural cracks generates.It is based on to improve
The survey of the Concatenate optical fiber macrobend loss type displacement sensor of OTDR (Optical Time Domain Reflect meter)
Accuracy of measurement, some scholars propose a kind of fiber annular interference displacement sensor, and have carried out experimental study.The result shows that the biography
Although sensor very economical is applicable in, there is still a need for be further improved measurement error caused by optical cable.In addition some scholars are in rubber
The sensing arrangement of spiral winding optical fiber on pipe is devised a kind of wide range distribution type fiber-optic displacement sensor, is analyzed using OTDR
Structure generates the size of displacement and the position that positioning displacement is extremely bigger than normal, maximum range 17mm.Also a kind of mode is then
Point type optical fiber crack sensors still use the aperture of OTDR analysis structural cracks, but the sensor theory range only has 26mm, and
Optical fiber is easy to break in big deformation.The either strain of structure, crack, deformation or displacement and optical fiber in the studies above
All it is in the non-linear relation of complexity between bending loss, the range of sensor is smaller, is unfavorable for bending loss of optical fiber sensing
The application in big malformation and Crack Monitoring or detection of device.
Utility model content
The mesh of the utility model is to provide a kind of optical fibre displacement sensor, solve present in existing displacement sensor
The problem of highly sensitive and wide range cannot get both.
The technical solution adopted in the utility model is that a kind of optical fibre displacement sensor includes the rectangular box body of one end open
The pedestal of structure, pedestal opening end embed slide lid, and Optical Fiber Winding axis, optical fiber are provided between the middle part of opposite flank in pedestal
Both ends are respectively fixed with gear on winding axis, and pull rod a is additionally provided in pedestal, and the one end pull rod a connects slide lid, and the other end is pierced by
Pedestal, and pull rod a and gear engage, and optical fiber fixed block is connected on Optical Fiber Winding axis, further includes sensor fibre, sensor fibre one end
Stable connection light source, the other end connect light power meter, and penetrating pedestal in the middle part of sensor fibre is fixed on optical fiber fixed block, outside pedestal
It is pierced by direction connecting rod b far from pull rod a.
The utility model is also characterized by：
Sensor fibre is fixedly connected with slide lid.
Opposite flank relative position opens up fluted in pedestal, and Optical Fiber Winding axis both ends are respectively connected with roller bearing, each to roll
Axis is set in groove.
Pull rod a includes the sliding rack a being mutually parallel, sliding rack b, and sliding rack a, sliding rack b are pierced by pedestal,
And be pierced by pedestal one end and connected by connecting rod, sliding rack a, sliding rack b are engaged with the gear at Optical Fiber Winding axis both ends respectively.
Sliding rack a, sliding rack b are located at base interior one end and are fixedly connected with slide lid.
It is socketed with thermal shrinkable sleeve cylinder outside sensor fibre.
The utility model has the beneficial effects that：A kind of optical fibre displacement sensor of the utility model, with spiral winding optical fiber and U
The mode of type revolution, has obtained wide range, the high-precision displacement sensor based on bending loss, overcomes and is damaged with this bending
Consumption is the non-linear relation for being measured with light loss in traditional displacement meter of principle, is had broad application prospects；Increase light
The sensitivity of fine displacement sensor, optical fiber are more uniformly stressed during the winding process, increase the range of optical fibre displacement sensor,
There is good use value.
Description of the drawings
Fig. 1 is a kind of optical fibre displacement sensor vertical view of the utility model；
Fig. 2 is a kind of optical fibre displacement sensor rearview of the utility model.
In figure, 1. pedestals, 2. Optical Fiber Winding axis, 3. gears, 4. pull rod a, 5. optical fiber fixed blocks, 6. sensor fibres, 7. is steady
Determine light source, 8. light power meters, 9. pull rod b, 10. grooves, 11. roller bearings, 12. slide lids, 13. pyrocondensation sleeves.
Specific implementation mode
The utility model is described in detail with reference to the accompanying drawings and detailed description.
A kind of optical fibre displacement sensor of the utility model includes the rectangular box body structure of one end open as shown in Figure 1 and Figure 2
Pedestal 1,1 open end of pedestal embeds slide lid 12, Optical Fiber Winding axis 2, light is provided between the middle part of opposite flank in pedestal 1
Both ends are respectively fixed with gear 3 on fibre winding axis 2, and pull rod a4 is additionally provided in pedestal 1, and the one end pull rod a4 connects slide lid 12,
The other end is pierced by pedestal 1, and pull rod a4 and gear 3 engage, and connection optical fiber fixed block 5, further includes sense light on Optical Fiber Winding axis 2
Fibre 6,6 one end stable connection light source 7 of sensor fibre, the other end connect light power meter 8, and 6 middle part of sensor fibre penetrates the fixation of pedestal 1
In on optical fiber fixed block 5, the outer separate pull rod a4 of pedestal 1 is pierced by direction connecting rod b9.
Sensor fibre 6 is fixedly connected with slide lid 12, can prevent base when Optical Fiber Winding axis 2 is rotated towards different directions
Sensor fibre 12 inside seat 1 is accumulated, and experimental result is influenced.
Opposite flank relative position opens up fluted 10 in pedestal 1, and 2 both ends of Optical Fiber Winding axis are respectively connected with roller bearing 11,
Each roller bearing 11 is set in groove 10.
Pull rod a4 includes the sliding rack a being mutually parallel, sliding rack b, and sliding rack a, sliding rack b are pierced by pedestal
1, and be pierced by 1 one end of pedestal and connected by connecting rod, sliding rack a, sliding rack the b gear 3 with 2 both ends of Optical Fiber Winding axis respectively
Engagement.
Sliding rack a, sliding rack b are located at 1 inside one end of pedestal and are fixedly connected with slide lid 12.
It is socketed with thermal shrinkable sleeve cylinder 13 outside sensor fibre 6.
A kind of application method of optical fibre displacement sensor of the utility model is as follows：
Monitored structure one end is fixed on pull rod a4 first, the other end is fixed on pull rod b9 and is located at outside pedestal 1
One end；Stabilized light source 7 is opened, initial value I is recorded by light power meter 80；After being spaced setting time again, recording light work(again
The reading I of rate meter 81；Finally by reading I0With reading I1Bring formula D=K (I into0-I1) in, the width of displacement structure is calculated,
D indicates that displacement structure width, K are the typical coefficient of sensor wherein in formula.
A kind of optical fibre displacement sensor operation principle of the utility model is as follows：
6 part of sensor fibre is wound on Optical Fiber Winding axis 2 in the optical fibre displacement sensor of the utility model, by pull rod
A4 and pull rod b9 are affixed with structure respectively, when there is displacement in structural damage, the pull rod b9 setting in motions of pull rod end, and pull rod b9
Drive sliding rack a, sliding rack b setting in motions simultaneously, sliding rack a, sliding rack b the meshed gear of drive
3, since gear 3 is fixedly connected with Optical Fiber Winding axis 2, then Optical Fiber Winding axis 2 is rotated around its axis original place；When gear 3 starts
When moving in a circle, sensor fibre 6 is wrapped on Optical Fiber Winding axis 2, is calculated by light power meter 8 and is wrapped in Optical Fiber Winding axis
6 length of sensor fibre on 2, when D is positive number, indicates displacement structure expansion to calculate the width of structural cracks；Work as D
For negative when, indicate displacement structure be closed.
The expansion shape of a structure is detected using a kind of optical fibre displacement sensor of the utility model and application method below
Condition：
The stabilized light source 7 and light power meter 8 that wavelength is 1550nm are connected by sensing optical fiber 6, Optical Fiber Winding axis 2 is straight
The number of teeth of diameter 15mm, gear 3 are 15, the modulus 1 of each rack and transmission gear.The typical coefficient K of known sensor is
7.1mm/db, pull rod a4 and pull rod b9 is affixed with monitored structure respectively, measure reading I1For 5.592db, I is read0For
7.00db, D=10.00mm can be obtained by bringing into formula, it is known that tested displacement structure expands 10.00mm.
By the above-mentioned means, a kind of optical fibre displacement sensor of the utility model is with spiral winding optical fiber and with U-shaped revolution
Mode has obtained wide range, the high-precision displacement sensor based on bending loss, has overcome using this bending loss as principle
Traditional displacement meter in be measured with the non-linear relation of light loss, have broad application prospects, during use, increase
The sensitivity of optical fibre displacement sensor, optical fiber are more uniformly stressed during the winding process, increase the amount of optical fibre displacement sensor
Journey has good use value.
Claims (6)
1. a kind of optical fibre displacement sensor, which is characterized in that the pedestal (1) of the rectangular box body structure including one end open, pedestal
(1) open end embeds slide lid (12), is provided with Optical Fiber Winding axis (2) between the middle part of pedestal (1) interior opposite flank, optical fiber twines
Both ends are respectively fixed with gear (3) on axis (2), and pull rod a (4), the connection sliding of pull rod a (4) one end are additionally provided in pedestal (1)
It covers (12), the other end is pierced by pedestal (1), and pull rod a (4) and gear (3) engagement, and connection optical fiber is fixed on Optical Fiber Winding axis (2)
Block (5), further includes sensor fibre (6), sensor fibre (6) one end stable connection light source (7), and the other end connects light power meter (8),
It is fixed on optical fiber fixed block (5) across slide lid (12) in the middle part of sensor fibre (6), pedestal (1) is pierced by far from pull rod a (4) outside
Direction connecting rod b (9).
2. a kind of optical fibre displacement sensor according to claim 1, which is characterized in that the sensor fibre (6) and slide lid
(12) it is fixedly connected.
3. a kind of optical fibre displacement sensor according to claim 1, which is characterized in that the interior opposite flank phase of pedestal (1)
Position is opened up fluted (10), Optical Fiber Winding axis (2) both ends are respectively connected with roller bearing (11), each roller bearing (11)
It is set in groove (10).
4. a kind of optical fibre displacement sensor according to claim 1, which is characterized in that the pull rod a (4) includes being mutually parallel
Sliding rack a, sliding rack b, the sliding rack a, sliding rack b be pierced by pedestal (1), and be pierced by pedestal (1) one end
It is connected by connecting rod, the sliding rack a, sliding rack b are engaged with the gear (3) at Optical Fiber Winding axis (2) both ends respectively.
5. a kind of optical fibre displacement sensor according to claim 4, which is characterized in that the sliding rack a, sliding rack b
It is fixedly connected with slide lid (12) positioned at the internal one end of pedestal (1).
6. a kind of optical fibre displacement sensor according to claim 1, which is characterized in that be socketed with outside the sensor fibre (6)
Pyrocondensation sleeve (13).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820387955.0U CN208026218U (en) | 2018-03-21 | 2018-03-21 | A kind of optical fibre displacement sensor |
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| CN201820387955.0U CN208026218U (en) | 2018-03-21 | 2018-03-21 | A kind of optical fibre displacement sensor |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109556642A (en) * | 2018-10-26 | 2019-04-02 | 西安理工大学 | A kind of fibre optical sensor for concrete structure crack monitoring |
| CN110411352A (en) * | 2019-07-29 | 2019-11-05 | 重庆大学 | Displacement monitor and method based on bending loss of optical fiber |
| CN110411353A (en) * | 2019-07-29 | 2019-11-05 | 重庆大学 | Wide range fiber grating displacement monitor and system |
| CN110411354A (en) * | 2019-07-29 | 2019-11-05 | 重庆大学 | Fiber grating wide-range displacement monitor and system |
| CN110422578A (en) * | 2019-08-14 | 2019-11-08 | 丽驰精密机械（嘉兴）有限公司 | A kind of removable adjusting seat based on conveyor track |
| CN110987946A (en) * | 2019-12-27 | 2020-04-10 | 西安理工大学 | Device and method for improving accuracy of crack sensor by using optical splitter |
| CN111023979A (en) * | 2019-12-13 | 2020-04-17 | 重庆大学 | Wide-range displacement monitoring device and method based on single-mode optical fiber bending loss |
| CN113758433A (en) * | 2021-08-30 | 2021-12-07 | 武汉理工大学 | Optical fiber joint meter and joint measuring method thereof |
| CN113917108A (en) * | 2021-09-07 | 2022-01-11 | 三峡大学 | Model test device for simulating high and steep slope excavation unloading and displacement monitoring method |
-
2018
- 2018-03-21 CN CN201820387955.0U patent/CN208026218U/en active Active
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109556642A (en) * | 2018-10-26 | 2019-04-02 | 西安理工大学 | A kind of fibre optical sensor for concrete structure crack monitoring |
| CN110411352A (en) * | 2019-07-29 | 2019-11-05 | 重庆大学 | Displacement monitor and method based on bending loss of optical fiber |
| CN110411353A (en) * | 2019-07-29 | 2019-11-05 | 重庆大学 | Wide range fiber grating displacement monitor and system |
| CN110411354A (en) * | 2019-07-29 | 2019-11-05 | 重庆大学 | Fiber grating wide-range displacement monitor and system |
| CN110422578A (en) * | 2019-08-14 | 2019-11-08 | 丽驰精密机械（嘉兴）有限公司 | A kind of removable adjusting seat based on conveyor track |
| CN111023979A (en) * | 2019-12-13 | 2020-04-17 | 重庆大学 | Wide-range displacement monitoring device and method based on single-mode optical fiber bending loss |
| CN111023979B (en) * | 2019-12-13 | 2021-08-27 | 重庆大学 | Wide-range displacement monitoring device and method based on single-mode optical fiber bending loss |
| CN110987946A (en) * | 2019-12-27 | 2020-04-10 | 西安理工大学 | Device and method for improving accuracy of crack sensor by using optical splitter |
| CN113758433A (en) * | 2021-08-30 | 2021-12-07 | 武汉理工大学 | Optical fiber joint meter and joint measuring method thereof |
| CN113917108A (en) * | 2021-09-07 | 2022-01-11 | 三峡大学 | Model test device for simulating high and steep slope excavation unloading and displacement monitoring method |
| CN113917108B (en) * | 2021-09-07 | 2024-03-12 | 三峡大学 | Model test device for simulating high-steep slope excavation unloading and displacement monitoring method |
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