CN203758458U - Optical fiber Bragg grating large displacement sensor based on gear rotary type - Google Patents
Optical fiber Bragg grating large displacement sensor based on gear rotary type Download PDFInfo
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- CN203758458U CN203758458U CN201320807951.0U CN201320807951U CN203758458U CN 203758458 U CN203758458 U CN 203758458U CN 201320807951 U CN201320807951 U CN 201320807951U CN 203758458 U CN203758458 U CN 203758458U
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- 238000006073 displacement reaction Methods 0.000 title claims abstract description 110
- 239000013307 optical fiber Substances 0.000 title claims abstract description 73
- 238000005259 measurement Methods 0.000 claims abstract description 19
- 238000006243 chemical reaction Methods 0.000 claims abstract description 14
- 238000005096 rolling process Methods 0.000 claims description 11
- 230000006698 induction Effects 0.000 claims description 8
- 238000009434 installation Methods 0.000 claims description 8
- 238000012546 transfer Methods 0.000 claims description 8
- 238000012544 monitoring process Methods 0.000 abstract description 4
- 239000002184 metal Substances 0.000 abstract 3
- 230000005540 biological transmission Effects 0.000 abstract 2
- 238000013178 mathematical model Methods 0.000 description 8
- 239000000835 fiber Substances 0.000 description 6
- 230000008033 biological extinction Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000001419 dependent effect Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000006467 substitution reaction Methods 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- NAWXUBYGYWOOIX-SFHVURJKSA-N (2s)-2-[[4-[2-(2,4-diaminoquinazolin-6-yl)ethyl]benzoyl]amino]-4-methylidenepentanedioic acid Chemical compound C1=CC2=NC(N)=NC(N)=C2C=C1CCC1=CC=C(C(=O)N[C@@H](CC(=C)C(O)=O)C(O)=O)C=C1 NAWXUBYGYWOOIX-SFHVURJKSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
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Abstract
The utility model relates to an optical fiber Bragg grating large displacement sensor based on a gear rotary type, and belongs to the technical field of photoelectronic measurement. The optical fiber Bragg grating large displacement sensor includes a displacement measurement and transmission device, a large/small displacement conversion device and a displacement sensing device; the above devices are fixed in a metal box; the displacement measurement and transmission device through a rack sleeve I and a rack sleeve II is fixed at a rack I in the metal box; the upper end of the rack I extends out of the metal box and is fixed through a displacement limiting sleeve; and the structure of the displacement conversion device is formed by a stepped shaft which is coaxially connected with a big gear and a small gear. The optical fiber Bragg grating large displacement sensor based on the gear rotary type can realize the real-time online monitoring of the large displacement and temperature.
Description
Technical field
The utility model relates to a kind of based on the rotary optical fiber Bragg raster large displacement sensor of gear, belongs to photoelectron field of measuring technique.
Background technology
In recent years Bridges in Our Country collapse, Tunnel Landslide, the Frequent Accidents such as landslide on the way, the situations such as crack variation in civil structure, relative position slip of promptly and accurately grasping detect displacement to seem particularly important.At present, existing fiber grating displacement sensor is generally that fiber grating is fixed on various elastic beams, displacement is transformed into the strain of grating by the deformation of beam (shell fragment), by demodulation grating wavelength, drifts about to measure corresponding displacement.This sensor has high, the anti-electromagnetic interference (EMI) of precision, stable chemical nature and can meet distributed measurement, and shortcoming is range little (being generally less than 200mm), is difficult to again be packaged into the sensor that is applicable to engineering application.
That approach with the utility model is a kind of fiber grating displacement sensor (referring to document: Li Lijun, " a kind of fiber grating displacement sensor ", patent of invention instructions, 2010 06 month, Granted publication number: CN 101762247 A).This technology adopts angular displacement conversion equipment to measure the large displacement in outside.Due to the multi-stage gear that angular displacement conversion equipment adopts, be prone to measured deviation and be difficult to encapsulation.The utility model adopts multidiameter that two different gears of radius are fixed on same axle, straight-line large displacement is passed through to the conversion of two gears, final effect, to the optical fiber Bragg raster sticking on equi intensity cantilever, has realized the real time on-line monitoring to large displacement and temperature.
Summary of the invention
The technical problems to be solved in the utility model is to provide a kind of based on the rotary optical fiber Bragg raster large displacement sensor of gear, realizes the real time on-line monitoring to large displacement and temperature.
The structure of sensor of the present utility model is: comprise displacement measurement and transfer device, displacement size conversion device and displacement induction installation, and said apparatus is all fixed on can 17 inside, the main body of displacement measurement and transfer device is by tooth bar sleeve pipe I 12 and tooth bar sleeve pipe II 13, to be fixed on the tooth bar I 5 of can 17 inside, and it is outside and fixing by displacement position-limiting sleeve pipe 11 that can 17 is stretched out in the upper end of tooth bar I 5; The structure of displacement size conversion device is coaxial gear wheel 3 and the pinion wheel 4 of connecting of multidiameter 10; The main body of displacement induction installation is that the tooth bar II 6 that tooth bar sleeve pipe III 14 fits, lower end are fixedly connected with by equi intensity cantilever 2 is crossed in logical upper end, and the upper and lower surface of equi intensity cantilever 2 is provided with optical fiber Bragg raster 1; Tooth bar I 5 and gear wheel 3 engagements, tooth bar II 6 and pinion wheel 4 engagements.
Described tooth bar I 5 bottoms are arranged on can 17 inside by spring I 15, and the top of tooth bar II 6 is fixed in can 17 by spring II.
The two ends of described multidiameter 10 are arranged on can 17 inside by rolling bearing I 8 and rolling bearing II 9 respectively.
Described optical fiber Bragg raster 1 is arranged on the upper and lower surface central axis place of equi intensity cantilever 2.
Described optical fiber Bragg raster 1 is pasted on equi intensity cantilever 2.
The using method of the utility model sensor is to set up mathematical model at sensor internal, by being transformed into the Bragg wavelength-shift of optical fiber Bragg raster after the mathematical model numerical value that actual measurement obtains to sensor, can calculate the displacement that displacement transducer is surveyed.Concrete steps comprise as follows:
(1) by measuring contact head 7 monitor strain displacements, the large displacement of tooth bar I 5 is coaxially converted to the little displacement of pinion wheel 4 by gear wheel 3, and then by tooth bar II 6, cause the deformation of equi intensity cantilever 2, the distortion of equi intensity cantilever causes the deformation of optical fiber Bragg raster, obtains the wavelength-shift amount of the optical fiber Bragg raster that strain displacement and temperature cause
for:
In formula,
be gage factor, size is
, wherein
for valid round-backscatter extinction logarithmic ratio, its value is
=0.22,
temperature sensitive coefficient,
optical fiber Bragg raster centre wavelength,
the suffered dependent variable of optical fiber Bragg raster,
it is the temperature variation of optical fiber Bragg raster;
(2) equi intensity cantilever 2 upper and lower surfaces are installed to the same optical fiber Bragg raster wavelength-shift of two primary wave appearance and subtract each other, eliminate the impact of environment temperature, the wavelength-shift difference that obtains upper and lower surperficial two optical fiber Bragg rasters is:
In formula,
,
be respectively the optical fiber Bragg raster wavelength-shift amount on the upper and lower surface of ripple;
(3), according to the mechanics of materials, obtain equi intensity cantilever amount of deflection f and cause that the axial strain of equi intensity cantilever center is:
Again according to the position relationship of sensor middle gear and tooth bar, obtain the Bragg wavelength-shift of optical fiber Bragg raster and the pass of outside actual displacement and be:
In formula, the thickness that h is the beam of uniform strength,
for beam of uniform strength length, f is equi intensity cantilever free end amount of deflection, and S is the displacement (being outside actual displacement) of tooth bar I 5,
for the radius of gear wheel 3,
radius for pinion wheel 4.
The mathematical model of the utility model technology is as follows:
The distortion of equi intensity cantilever causes the deformation of optical fiber Bragg raster, if temperature variation in measuring process
, the wavelength-shift amount of the optical fiber Bragg raster that strain and temperature cause
for:
（1）
In formula (1),
be gage factor, size is
, wherein
for valid round-backscatter extinction logarithmic ratio, its value is
=0.22,
temperature sensitive coefficient,
optical fiber Bragg raster centre wavelength,
the suffered dependent variable of optical fiber Bragg raster,
it is the temperature variation of optical fiber Bragg raster.
The same optical fiber Bragg raster wavelength-shift of two primary wave appearance that the upper and lower surface of equi intensity cantilever is pasted subtracts each other, and eliminates the impact of environment temperature:
（2）
In formula (2),
for the wavelength-shift difference of upper and lower surperficial two optical fiber Bragg rasters,
,
be respectively the optical fiber Bragg raster wavelength-shift amount on the upper and lower surface of ripple.
According to the computing formula of the mechanics of materials, equi intensity cantilever amount of deflection f causes that the axial strain of equi intensity cantilever center is:
（3）
In formula (3), the thickness that h is the beam of uniform strength,
for beam of uniform strength length.
Due to equi intensity cantilever free end amount of deflection, f is generally very little, and the free-ended displacement of equi intensity cantilever that tooth bar II 6 is applied to is just f, so the number of teeth that pinion wheel 4 turns over:
（4）
In formula (4),
for the radius of pinion wheel 4,
for pinion wheel 4 numbers of teeth.
Pinion wheel 4 anglecs of rotation are:
（5）
In formula (5),
radius for pinion wheel 4.
Pinion wheel 4 and gear wheel 3 coaxial rotatings, therefore the angle that gear wheel 3 turns over
so the number of teeth that gear wheel 3 turns over is:
(6)
In formula (6),
for gear wheel 3 numbers of teeth.
The displacement that can obtain thus tooth bar I 5 is:
（7）
In formula in (7),
for the radius of gear wheel 3, tooth bar I 5 displacement S are outside actual displacement.
By formula (6), can be obtained:
（8）
(8) formula substitution (2) formula, the strain on semi-girder
with the pass of outside actual displacement be:
（9）
(9) formula substitution (1) formula, the Bragg wavelength-shift of optical fiber Bragg raster and the pass of outside actual displacement are:
(10)
Formula (10) has shown displacement S that displacement transducer is surveyed and the mathematical model between the Bragg wavelength-shift of optical fiber Bragg raster, and the Bragg wavelength-shift by measuring optical fiber Bragg grating can calculate the displacement that displacement transducer is surveyed.
The beneficial effects of the utility model are:
(1) range is large.Owing to adopting the wheeled displacement transformational structure of bidentate, the large displacement in outside is changed into little displacement by sensor measurement.
(2) highly sensitive.Because displacement sensor structure is simple, the radius ratio of adjusting gear 3 and gear 4 can realize high-sensitivity measurement.
(3) realize the on-line monitoring of displacement: the little displacement that tooth bar 6 converts the displacement size conversion device of gear 3 and gear 4 to is applied on equi intensity cantilever, equi intensity cantilever amount of deflection is changed, thereby cause the Bragg wavelength that sticks on the optical fiber Bragg raster on the upper and lower centre of surface axle of equi intensity cantilever to produce displacement, by recording the wavelength variations of optical fiber Bragg raster, just can calculate the size of external displacement.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the structural representation of rolling bearing of the present utility model and multidiameter.
In figure, each label represents successively: 1-optical fiber Bragg raster, 2-equi intensity cantilever, 3-gear wheel, 4-pinion wheel, 5-tooth bar I, 6-tooth bar II, 7-measure contact head, 8-rolling bearing I, 9-rolling bearing II, 10-multidiameter, 11-displacement position-limiting sleeve pipe, 12-tooth bar sleeve pipe I, 13-tooth bar sleeve pipe II, 14-tooth bar sleeve pipe III, 15-spring I, 16-spring II, 17-can, the external optical fiber of 18-.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Embodiment one: as illustrated in fig. 1 and 2, present embodiment based on the rotary optical fiber Bragg raster large displacement sensor of gear structure is: comprise displacement measurement and transfer device, displacement size conversion device and displacement induction installation, and said apparatus is all fixed on can 17 inside, the main body of displacement measurement and transfer device is by tooth bar sleeve pipe I 12 and tooth bar sleeve pipe II 13, to be fixed on the tooth bar I 5 of can 17 inside, and it is outside and fixing by displacement position-limiting sleeve pipe 11 that can 17 is stretched out in the upper end of tooth bar I 5; The structure of displacement size conversion device is coaxial gear wheel 3 and the pinion wheel 4 of connecting of multidiameter 10; The main body of displacement induction installation is that the tooth bar II 6 that tooth bar sleeve pipe III 14 fits, lower end are fixedly connected with by equi intensity cantilever 2 is crossed in logical upper end, and the upper and lower surface of equi intensity cantilever 2 is provided with optical fiber Bragg raster 1; Tooth bar I 5 and gear wheel 3 engagements, tooth bar II 6 and pinion wheel 4 engagements.Tooth bar I 5 bottoms are arranged on can 17 inside by spring I 15, and the top of tooth bar II 6 is fixed in can 17 by spring II.The two ends of multidiameter 10 are arranged on can 17 inside by rolling bearing I 8 and rolling bearing II 9 respectively.Optical fiber Bragg raster 1 is arranged on the upper and lower surface central axis place of equi intensity cantilever 2.Fiber grating 1 is arranged on equi intensity cantilever 2 by pasting.
The using method of present embodiment sensor is to set up mathematical model at sensor internal, by being transformed into the Bragg wavelength-shift of optical fiber Bragg raster after the mathematical model numerical value that actual measurement obtains to sensor, can calculate the displacement that displacement transducer is surveyed.Concrete steps comprise as follows:
(1) by measuring contact head 7 monitor strain displacements, the large displacement of tooth bar I 5 is coaxially converted to the little displacement of pinion wheel 4 by gear wheel 3, and then by tooth bar II 6, cause the deformation of equi intensity cantilever 2, the distortion of equi intensity cantilever causes the deformation of optical fiber Bragg raster, obtains the wavelength-shift amount of the optical fiber Bragg raster that strain displacement and temperature cause
for:
In formula,
be gage factor, size is
, wherein
for valid round-backscatter extinction logarithmic ratio, its value is
=0.22,
temperature sensitive coefficient,
optical fiber Bragg raster centre wavelength,
the suffered dependent variable of optical fiber Bragg raster,
it is the temperature variation of optical fiber Bragg raster;
(2) equi intensity cantilever 2 upper and lower surfaces are installed to the same optical fiber Bragg raster wavelength-shift of two primary wave appearance and subtract each other, eliminate the impact of environment temperature, the wavelength-shift difference that obtains upper and lower surperficial two optical fiber Bragg rasters is:
In formula,
,
be respectively the optical fiber Bragg raster wavelength-shift amount on the upper and lower surface of ripple;
(3), according to the mechanics of materials, obtain equi intensity cantilever amount of deflection f and cause that the axial strain of equi intensity cantilever center is:
Again according to the position relationship of sensor middle gear and tooth bar, obtain the Bragg wavelength-shift of optical fiber Bragg raster and the pass of outside actual displacement and be:
In formula, the thickness that h is the beam of uniform strength,
for beam of uniform strength length, f is equi intensity cantilever free end amount of deflection, and S is the displacement (being outside actual displacement) of tooth bar I 5,
for the radius of gear wheel 3,
radius for pinion wheel 4.
The design parameter of present embodiment is: semi-girder size: length l=200mm, thickness h=2mm; Gear size: gear 1 radius
=150mm, gear 2 radiuses
=25mm; Optical fiber Bragg raster technical parameter: centre wavelength
=1547.000nm, valid round-backscatter extinction logarithmic ratio
=0.22; With fiber grating analyser, obtain the Bragg wavelength of optical fiber Bragg raster; According to following formula, the Bragg wavelength-shift of optical fiber Bragg raster to the response sensitivity of displacement is:
By in known quantity substitution formula, theory is calculated and is shown, the sensitivity of this displacement transducer is 20.11pm/mm.Therefore,, when the wavelength resolution of optical fiber Bragg raster (FBG) demodulator is 1pm, the resolution of this sensor is 0.0497mm.Result of calculation shows that the measurement range of this sensor approaches 300mm, and has high measurement resolution, and measuring error is little.
Embodiment two: as illustrated in fig. 1 and 2, present embodiment based on the rotary optical fiber Bragg raster large displacement sensor of gear structure is: comprise displacement measurement and transfer device, displacement size conversion device and displacement induction installation, and said apparatus is all fixed on can 17 inside, the main body of displacement measurement and transfer device is by tooth bar sleeve pipe I 12 and tooth bar sleeve pipe II 13, to be fixed on the tooth bar I 5 of can 17 inside, and it is outside and fixing by displacement position-limiting sleeve pipe 11 that can 17 is stretched out in the upper end of tooth bar I 5; The structure of displacement size conversion device is coaxial gear wheel 3 and the pinion wheel 4 of connecting of multidiameter 10; The main body of displacement induction installation is that the tooth bar II 6 that tooth bar sleeve pipe III 14 fits, lower end are fixedly connected with by equi intensity cantilever 2 is crossed in logical upper end, and the upper and lower surface of equi intensity cantilever 2 is provided with optical fiber Bragg raster 1; Tooth bar I 5 and gear wheel 3 engagements, tooth bar II 6 and pinion wheel 4 engagements.Tooth bar I 5 bottoms are arranged on can 17 inside by spring I 15, and the top of tooth bar II 6 is fixed in can 17 by spring II.The two ends of multidiameter 10 are arranged on can 17 inside by rolling bearing I 8 and rolling bearing II 9 respectively.
The using method of present embodiment sensor is to set up mathematical model at sensor internal, by being transformed into the Bragg wavelength-shift of optical fiber Bragg raster after the mathematical model numerical value that actual measurement obtains to sensor, can calculate the displacement that displacement transducer is surveyed.Concrete steps comprise as follows:
(1) by measuring contact head 7 monitor strain displacements, the large displacement of tooth bar I 5 is coaxially converted to the little displacement of pinion wheel 4 by gear wheel 3, and then by tooth bar II 6, cause the deformation of equi intensity cantilever 2, the distortion of equi intensity cantilever causes the deformation of optical fiber Bragg raster, obtains the wavelength-shift amount of the optical fiber Bragg raster that strain displacement and temperature cause
for:
In formula,
be gage factor, size is
, wherein
for valid round-backscatter extinction logarithmic ratio, its value is
=0.22,
temperature sensitive coefficient,
optical fiber Bragg raster centre wavelength,
the suffered dependent variable of optical fiber Bragg raster,
it is the temperature variation of optical fiber Bragg raster;
(2) equi intensity cantilever 2 upper and lower surfaces are installed to the same optical fiber Bragg raster wavelength-shift of two primary wave appearance and subtract each other, eliminate the impact of environment temperature, the wavelength-shift difference that obtains upper and lower surperficial two optical fiber Bragg rasters is:
In formula,
,
be respectively the optical fiber Bragg raster wavelength-shift amount on the upper and lower surface of ripple;
(3), according to the mechanics of materials, obtain equi intensity cantilever amount of deflection f and cause that the axial strain of equi intensity cantilever center is:
Again according to the position relationship of sensor middle gear and tooth bar, obtain the Bragg wavelength-shift of optical fiber Bragg raster and the pass of outside actual displacement and be:
In formula, the thickness that h is the beam of uniform strength,
for beam of uniform strength length, f is equi intensity cantilever free end amount of deflection, and S is the displacement (being outside actual displacement) of tooth bar I 5,
for the radius of gear wheel 3,
radius for pinion wheel 4.
Below by reference to the accompanying drawings embodiment of the present utility model is explained in detail, but the utility model is not limited to above-mentioned embodiment, in the ken possessing those of ordinary skills, can also under the prerequisite that does not depart from the utility model aim, make various variations.
Claims (5)
1. one kind based on the rotary optical fiber Bragg raster large displacement sensor of gear, it is characterized in that: comprise displacement measurement and transfer device, displacement size conversion device and displacement induction installation, and said apparatus is all fixed on can (17) inside, the main body of displacement measurement and transfer device is to be fixed on the inner tooth bar I (5) of can (17) by tooth bar sleeve pipe I (12) and tooth bar sleeve pipe II (13), and it is outside and fixing by displacement position-limiting sleeve pipe (11) that can (17) is stretched out in the upper end of tooth bar I (5); The structure of displacement size conversion device is that multidiameter (10) coaxially connects gear wheel (3) and pinion wheel (4); The main body of displacement induction installation is that the tooth bar II (6) that tooth bar sleeve pipe III (14) fit, lower end are fixedly connected with by equi intensity cantilever (2) is passed through in upper end, and the upper and lower surface of equi intensity cantilever (2) is provided with optical fiber Bragg raster (1); Tooth bar I (5) and gear wheel (3) engagement, tooth bar II (6) and pinion wheel (4) engagement.
2. according to claim 1 based on the rotary optical fiber Bragg raster large displacement sensor of gear, it is characterized in that: described tooth bar I (5) bottom is arranged on can (17) inside by spring I (15), and the top of tooth bar II (6) is fixed in can (17) by spring II.
3. according to claim 1 based on the rotary optical fiber Bragg raster large displacement sensor of gear, it is characterized in that: the two ends of described multidiameter (10) are arranged on can (17) inside by rolling bearing I (8) and rolling bearing II (9) respectively.
4. according to claim 1 based on the rotary optical fiber Bragg raster large displacement sensor of gear, it is characterized in that: described optical fiber Bragg raster (1) is arranged on the upper and lower surface central axis place of equi intensity cantilever (2).
5. according to claim 4 based on the rotary optical fiber Bragg raster large displacement sensor of gear, it is characterized in that: described optical fiber Bragg raster (1) is pasted on equi intensity cantilever (2).
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103673898A (en) * | 2013-12-11 | 2014-03-26 | 昆明理工大学 | Rotary fiber Bragg grating large displacement sensor based on gear and application method thereof |
| CN109373925A (en) * | 2018-12-21 | 2019-02-22 | 中国科学院武汉岩土力学研究所 | A kind of large deformation test device and test method based on optical fiber small strain |
| PL441589A1 (en) * | 2022-06-29 | 2024-01-03 | Operator Gazociągów Przesyłowych Gaz-System Spółka Akcyjna | Measuring transducer for measuring linear displacement, system for measuring linear displacement, in particular of a pipeline compensator, and method for measuring linear displacement, in particular of a pipeline compensator |
-
2013
- 2013-12-11 CN CN201320807951.0U patent/CN203758458U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103673898A (en) * | 2013-12-11 | 2014-03-26 | 昆明理工大学 | Rotary fiber Bragg grating large displacement sensor based on gear and application method thereof |
| CN103673898B (en) * | 2013-12-11 | 2016-05-11 | 昆明理工大学 | A kind of using method based on the rotary optical fiber Bragg raster large displacement sensor of gear |
| CN109373925A (en) * | 2018-12-21 | 2019-02-22 | 中国科学院武汉岩土力学研究所 | A kind of large deformation test device and test method based on optical fiber small strain |
| PL441589A1 (en) * | 2022-06-29 | 2024-01-03 | Operator Gazociągów Przesyłowych Gaz-System Spółka Akcyjna | Measuring transducer for measuring linear displacement, system for measuring linear displacement, in particular of a pipeline compensator, and method for measuring linear displacement, in particular of a pipeline compensator |
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