CN203687878U - Displacement sensor based on gear rotary type fiber Bragg raster - Google Patents
Displacement sensor based on gear rotary type fiber Bragg raster Download PDFInfo
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- CN203687878U CN203687878U CN201320748627.6U CN201320748627U CN203687878U CN 203687878 U CN203687878 U CN 203687878U CN 201320748627 U CN201320748627 U CN 201320748627U CN 203687878 U CN203687878 U CN 203687878U
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- tooth bar
- rolling bearing
- sleeve pipe
- gear
- optical fiber
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- 238000006073 displacement reaction Methods 0.000 title claims abstract description 65
- 239000000835 fiber Substances 0.000 title abstract description 12
- 238000005096 rolling process Methods 0.000 claims abstract description 73
- 238000005259 measurement Methods 0.000 claims abstract description 16
- 239000002184 metal Substances 0.000 claims abstract description 12
- 239000013307 optical fiber Substances 0.000 claims description 65
- 238000012544 monitoring process Methods 0.000 abstract description 4
- 230000035945 sensitivity Effects 0.000 abstract description 4
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 abstract 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000006467 substitution reaction Methods 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 230000008033 biological extinction Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 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
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010892 electric spark Methods 0.000 description 1
- 239000012777 electrically insulating material Substances 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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Abstract
The utility model relates to a displacement sensor based on a gear rotary type fiber Bragg raster, and belongs to the photoelectron measurement technical field; the displacement sensor comprises a fiber Bragg raster, a cantilever beam, a gear I, a gear II, a tooth bar I, a tooth bar II, a measuring contact, a rolling bearing I, a rolling bearing II, a stepped shaft, a displacement limit sleeve pipe, a tooth bar sleeve pipe I, a tooth bar sleeve pipe II, a tooth bar sleeve pipe III, a spring I, a spring II, a metal box, an external fiber, a rolling bearing I pedestal and a rolling bearing II pedestal; the fiber Bragg raster, the cantilever beam, the gear I, the gear II, the tooth bar I, the tooth bar II, the rolling bearing I, the rolling bearing II, the stepped shaft, the tooth bar sleeve pipe I, the tooth bar sleeve pipe II, the tooth bar sleeve pipe III, the spring I, the spring II, the rolling bearing I pedestal and the rolling bearing II pedestal are sealed in the metal box. The displacement sensor based on the gear rotary type fiber Bragg raster can realize displacement online monitoring, is simple in structure, convenient in usage, large in measuring range, adjustable in sensitivity, and strong in anti-interference capability.
Description
Technical field
The utility model relates to a kind of based on the rotary optical fiber Bragg raster displacement transducer 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 situation such as crack variation, relative position slip in civil structure promptly and accurately grasped detects 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), drifts about to measure corresponding displacement by demodulation grating wavelength.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.With the utility model approach be a kind of fiber grating displacement sensor (referring to patent, Granted publication number: CN 101762247 A).This technology adopts the capable measurement of the external position of angular displacement conversion equipment shift-in.Due to the multi-stage gear that angular displacement conversion equipment adopts, be prone to measured deviation and be difficult to encapsulation.
When displacement transducer by employing based on the rotary optical fiber Bragg raster of gear carries out real time on-line monitoring, need to consider the formation of optical fiber Bragg raster displacement transducer, and how install to realize the protection problem to optical fiber while measurement.
Summary of the invention
It is a kind of based on the rotary optical fiber Bragg raster displacement transducer of gear that the utility model provides, structure, the installation question of optical fiber Bragg raster displacement transducer when solving the on-line monitoring to displacement.
The technical solution of the utility model is: a kind of based on the rotary optical fiber Bragg raster displacement transducer of gear, and comprise optical fiber Bragg raster 1, semi-girder 2, gear I 3, gear II 4, tooth bar I 5, tooth bar II 6, measure contact head 7, rolling bearing I 8, rolling bearing II 9, multidiameter 10, displacement position-limiting sleeve pipe 11, tooth bar sleeve pipe I 12, tooth bar sleeve pipe II 13, tooth bar sleeve pipe III 14, spring I 15, spring II 16, can 17, external optical fiber 18, rolling bearing I base and rolling bearing II base, wherein optical fiber Bragg raster 1, semi-girder 2, gear I 3, gear II 4, tooth bar I 5, tooth bar II 6, rolling bearing I 8, rolling bearing II 9, multidiameter 10, tooth bar sleeve pipe I 12, tooth bar sleeve pipe II 13, tooth bar sleeve pipe III 14, spring I 15, spring II 16, rolling bearing I base and rolling bearing II base are encapsulated in the inside of can 17, and optical fiber Bragg raster 1 is pasted on semi-girder 2, on lower surface central shaft and draw outside rectangular metal box 17, together with gear I 3 is passed through the coaxial string of multidiameter 10 with gear II 4, tooth bar I 5 tops are connected with measurement contact head 7, tooth bar I 5 middle parts and gear I 3 are coincide, tooth bar I 5 bottoms are connected with spring I 15, tooth bar II 6 middle parts and gear II 4 are coincide, tooth bar II 6 tops are connected to spring II 16, tooth bar II 6 bottoms are connected with semi-girder 2 free ends, multidiameter 10 is fixed in rolling bearing I 8 and rolling bearing II 9, and rolling bearing I base and rolling bearing II base are by rolling bearing I 8, rolling bearing II 9 is fixed on rectangular metal box 17 inside, and displacement position-limiting sleeve pipe 11 is integrated with measuring contact head 7, and the lower end of displacement position-limiting sleeve pipe 11 and tooth bar I 5 are connected and are fixed on the upper end of can 17, tooth bar sleeve pipe I 12, one end of tooth bar sleeve pipe II 13 is welded on the inwall of can 17, tooth bar sleeve pipe I 12, the other end of tooth bar sleeve pipe II 13 is connected with tooth bar I 5 by notch, one end of tooth bar sleeve pipe III 14 is welded on the inwall of can 17, the other end of tooth bar sleeve pipe III 14 is connected with tooth bar II 6 by notch, and optical fiber Bragg raster 1 is drawn external optical fiber 18 by optical fiber fairlead.
Principle of work of the present utility model is:
Measure contact head 7 and form external displacement measurement mechanism with displacement position-limiting sleeve pipe 11, tooth bar I 5 and measurement contact head 7 connect and compose displacement transfer device, tooth bar I 5 and gear I 3 are coincide, gear I 3 and gear II 4 are by the coaxial fixing displacement size conversion device that forms of multidiameter 10, multidiameter 10 is arranged on rolling bearing I 8, in rolling bearing II 9, rolling bearing I base and rolling bearing II base are by rolling bearing I 8, rolling bearing II 9 is fixed in rectangular metal box 17, tooth bar II 6 is coincide with gear II 4, tooth bar II 6 bottoms are connected with semi-girder 2 free ends, the stiff end of semi-girder 2 is connected with rectangular metal box 17, fiber Bragg grating 1 sticks on semi-girder 2, on the central axis of lower surface, optical fiber Bragg raster 1 is drawn external optical fiber 18 by optical fiber fairlead, utilize (FBG) demodulator to obtain the shift value of optical fiber Bragg raster centre wavelength, by outside actual displacement inverse out, realize the corresponding relation of wavelength and displacement.
Mathematics model analysis of the present utility model is as follows:
The distortion of rectangular cantilever beam 2 causes the deformation of optical fiber Bragg raster 1, if temperature variation in measuring process
, the wavelength-shift amount of the optical fiber Bragg raster 1 that strain and temperature cause
for:
In formula,
for gage factor, size is
;
p e for valid round-backscatter extinction logarithmic ratio, its value is
p e =0.22;
s t for temperature sensitive coefficient;
for the centre wavelength of optical fiber Bragg raster 1;
for the suffered dependent variable of optical fiber Bragg raster 1; Δ
tfor the temperature variation of optical fiber Bragg raster 1.
Same optical fiber Bragg raster 1 wavelength-shift of two primary wave appearance that upper and lower semi-girder 2 surface is pasted subtracts each other, and eliminates the impact of environment temperature:
In formula,
for the wavelength-shift difference of upper and lower surperficial two optical fiber Bragg rasters 1,
,
be respectively optical fiber Bragg raster wavelength 1 shift amount on semi-girder 2 upper and lower surfaces.
The uniform beam that semi-girder 2 is square-section, according to the computing formula of the mechanics of materials, semi-girder 2 free end travels
fcause on flexible member and investigate a little
xthe axial strain in cross section, place is:
（3）
In formula,
lfor uniform beam length,
xfor the paste position of optical fiber Bragg raster 1,
hfor the thickness of uniform beam.
Due to semi-girder 2 free end travels
fwhen very little, tooth bar II 6 the free-ended displacement of the semi-girder that is applied to 2 be
fso, the number of teeth that gear II 4 turns over:
In formula,
r 2for the radius of gear II 4,
z 2for the number of teeth of gear II 4.
Gear II 4 anglecs of rotation are:
（5）
Gear II 4 and gear I 3 coaxial rotatings, therefore the angle that gear I 3 turns over
=
so the number of teeth that gear I 3 turns over is:
In formula,
z 1for the number of teeth of gear I 3.
The displacement that can obtain thus tooth bar I 5 is:
In formula,
r 1for the radius of gear I 3,5 displacements of tooth bar I
sbe outside actual displacement.
Can be obtained by formula (7):
(8) formula substitution (3) formula, the strain on semi-girder 2
with outside actual displacement
spass be:
(9) formula substitution (1) formula, the Bragg wavelength-shift of optical fiber Bragg raster 1 and outside actual displacement
spass be:
Formula (10) has shown the displacement that displacement transducer is surveyed
sand the mathematical model between the Bragg wavelength-shift of optical fiber Bragg raster, can calculate by the Bragg wavelength-shift of measuring optical fiber Bragg grating 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, external displacement is changed into little displacement by sensor measurement.
2, sensitivity is adjustable.Because displacement sensor structure is simple, the radius ratio of adjusting gear I and gear II can realize high-sensitivity measurement, and increase the thickness of semi-girder, reduce the length of semi-girder, make fiber grating paste position approach as far as possible the stiff end of semi-girder, all can effectively improve the displacement resolution of system.
3, realize the on-line monitoring of displacement: the little displacement that tooth bar II converts the displacement size conversion device of gear I and gear II to is applied on semi-girder, cantilever beam deflection is changed, thereby cause the Bragg wavelength that sticks on the optical fiber Bragg raster on semi-girder upper and lower surface central shaft to produce displacement, just can calculate the size of external displacement by recording the wavelength variations of optical fiber Bragg raster.
4, antijamming capability is strong: adopt electrically insulating material optical fiber Bragg raster, signal transmission is light signal, can resist electromagnetic interference (EMI), meanwhile, reduces in addition the ignite effect of inflammable gas gas to be measured of electric spark, has reduced potential safety hazard.Optical fiber Bragg grating sensor is applicable to exist under the special operation condition in electromagnetic interference (EMI) situation and measures in real time.
5, simple in structure, easy to use.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is rolling bearing and multidiameter structural representation in the utility model;
Fig. 3 is rectangular cantilever beam structural drawing in the utility model;
Each label in figure: 1 is that optical fiber Bragg raster, 2 is that semi-girder, 3 is that gear I, 4 is that gear II, 5 is that tooth bar I, 6 is that tooth bar II, 7 is that measurement contact head, 8 is that rolling bearing I, 9 is that rolling bearing II, 10 is that multidiameter, 11 is that displacement position-limiting sleeve pipe, 12 is that tooth bar sleeve pipe I, 13 is that tooth bar sleeve pipe II, 14 is that tooth bar sleeve pipe III, 15 is that spring I, 16 is that spring II, 17 is that can, 18 is external optical fiber.
Embodiment
Embodiment 1: as Figure 1-3, a kind of based on the rotary optical fiber Bragg raster displacement transducer of gear, comprise optical fiber Bragg raster 1, semi-girder 2, gear I 3, gear II 4, tooth bar I 5, tooth bar II 6, measure contact head 7, rolling bearing I 8, rolling bearing II 9, multidiameter 10, displacement position-limiting sleeve pipe 11, tooth bar sleeve pipe I 12, tooth bar sleeve pipe II 13, tooth bar sleeve pipe III 14, spring I 15, spring II 16, can 17, external optical fiber 18, rolling bearing I base and rolling bearing II base, wherein optical fiber Bragg raster 1, semi-girder 2, gear I 3, gear II 4, tooth bar I 5, tooth bar II 6, rolling bearing I 8, rolling bearing II 9, multidiameter 10, tooth bar sleeve pipe I 12, tooth bar sleeve pipe II 13, tooth bar sleeve pipe III 14, spring I 15, spring II 16, rolling bearing I base and rolling bearing II base are encapsulated in the inside of can 17, and optical fiber Bragg raster 1 is pasted on semi-girder 2, on lower surface central shaft and draw outside rectangular metal box 17, together with gear I 3 is passed through the coaxial string of multidiameter 10 with gear II 4, tooth bar I 5 tops are connected with measurement contact head 7, tooth bar I 5 middle parts and gear I 3 are coincide, tooth bar I 5 bottoms are connected with spring I 15, tooth bar II 6 middle parts and gear II 4 are coincide, tooth bar II 6 tops are connected to spring II 16, tooth bar II 6 bottoms are connected with semi-girder 2 free ends, multidiameter 10 is fixed in rolling bearing I 8 and rolling bearing II 9, and rolling bearing I base and rolling bearing II base are by rolling bearing I 8, rolling bearing II 9 is fixed on rectangular metal box 17 inside, and displacement position-limiting sleeve pipe 11 is integrated with measuring contact head 7, and the lower end of displacement position-limiting sleeve pipe 11 and tooth bar I 5 are connected and are fixed on the upper end of can 17, tooth bar sleeve pipe I 12, one end of tooth bar sleeve pipe II 13 is welded on the inwall of can 17, tooth bar sleeve pipe I 12, the other end of tooth bar sleeve pipe II 13 is connected with tooth bar I 5 by notch, one end of tooth bar sleeve pipe III 14 is welded on the inwall of can 17, the other end of tooth bar sleeve pipe III 14 is connected with tooth bar II 6 by notch, and optical fiber Bragg raster 1 is drawn external optical fiber 18 by optical fiber fairlead.
Embodiment 2: as Figure 1-3, a kind of based on the rotary optical fiber Bragg raster displacement transducer of gear, comprise optical fiber Bragg raster 1, semi-girder 2, gear I 3, gear II 4, tooth bar I 5, tooth bar II 6, measure contact head 7, rolling bearing I 8, rolling bearing II 9, multidiameter 10, displacement position-limiting sleeve pipe 11, tooth bar sleeve pipe I 12, tooth bar sleeve pipe II 13, tooth bar sleeve pipe III 14, spring I 15, spring II 16, can 17, external optical fiber 18, rolling bearing I base and rolling bearing II base, wherein optical fiber Bragg raster 1, semi-girder 2, gear I 3, gear II 4, tooth bar I 5, tooth bar II 6, rolling bearing I 8, rolling bearing II 9, multidiameter 10, tooth bar sleeve pipe I 12, tooth bar sleeve pipe II 13, tooth bar sleeve pipe III 14, spring I 15, spring II 16, rolling bearing I base and rolling bearing II base are encapsulated in the inside of can 17, and optical fiber Bragg raster 1 is pasted on semi-girder 2, on lower surface central shaft and draw outside rectangular metal box 17, together with gear I 3 is passed through the coaxial string of multidiameter 10 with gear II 4, tooth bar I 5 tops are connected with measurement contact head 7, tooth bar I 5 middle parts and gear I 3 are coincide, tooth bar I 5 bottoms are connected with spring I 15, tooth bar II 6 middle parts and gear II 4 are coincide, tooth bar II 6 tops are connected to spring II 16, tooth bar II 6 bottoms are connected with semi-girder 2 free ends, multidiameter 10 is fixed in rolling bearing I 8 and rolling bearing II 9, and rolling bearing I base and rolling bearing II base are by rolling bearing I 8, rolling bearing II 9 is fixed on rectangular metal box 17 inside, and displacement position-limiting sleeve pipe 11 is integrated with measuring contact head 7, and the lower end of displacement position-limiting sleeve pipe 11 and tooth bar I 5 are connected and are fixed on the upper end of can 17, tooth bar sleeve pipe I 12, one end of tooth bar sleeve pipe II 13 is welded on the inwall of can 17, tooth bar sleeve pipe I 12, the other end of tooth bar sleeve pipe II 13 is connected with tooth bar I 5 by notch, one end of tooth bar sleeve pipe III 14 is welded on the inwall of can 17, the other end of tooth bar sleeve pipe III 14 is connected with tooth bar II 6 by notch, and optical fiber Bragg raster 1 is drawn external optical fiber 18 by optical fiber fairlead.
Concrete implementation step is:
1, semi-girder size: length
l=200mm, thickness
h=1mm, width
b=100mm.
2, gear size: the radius of gear I 3
r 1=800mm, the radius of gear II 4
r 2=100mm.
3, optical fiber Bragg raster technical parameter: centre wavelength
=1547.000nm, valid round-backscatter extinction logarithmic ratio
p e =0.22, paste position
x=50mm.
4, can be by accompanying drawing 1 configuration experiment.
5, obtain the Bragg wavelength of optical fiber Bragg raster with fiber grating analyser.
6, the response sensitivity to displacement according to the Bragg wavelength-shift of formula optical fiber Bragg raster, by known quantity substitution (10) formula
:
Theory is calculated and is shown, the sensitivity of this displacement transducer is 8.48pm/mm.Therefore,, in the time that the wavelength resolution of optical fiber Bragg raster (FBG) demodulator is 1pm, the resolution of this sensor is 0.118mm.Result of calculation shows that the measurement range of this sensor is greater than 300mm, and has high measurement resolution, and measuring error is little.
By reference to the accompanying drawings embodiment of the present utility model is explained in detail above, 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 (1)
1. one kind based on the rotary optical fiber Bragg raster displacement transducer of gear, it is characterized in that: comprise optical fiber Bragg raster (1), semi-girder (2), gear I (3), gear II (4), tooth bar I (5), tooth bar II (6), measure contact head (7), rolling bearing I (8), rolling bearing II (9), multidiameter (10), displacement position-limiting sleeve pipe (11), tooth bar sleeve pipe I (12), tooth bar sleeve pipe II (13), tooth bar sleeve pipe III (14), spring I (15), spring II (16), can (17), external optical fiber (18), rolling bearing I base and rolling bearing II base, wherein optical fiber Bragg raster (1), semi-girder (2), gear I (3), gear II (4), tooth bar I (5), tooth bar II (6), rolling bearing I (8), rolling bearing II (9), multidiameter (10), tooth bar sleeve pipe I (12), tooth bar sleeve pipe II (13), tooth bar sleeve pipe III (14), spring I (15), spring II (16), rolling bearing I base and rolling bearing II base are encapsulated in the inside of can (17), optical fiber Bragg raster (1) is pasted on semi-girder (2), on lower surface central shaft and draw outside rectangular metal box (17), together with gear I (3) is passed through the coaxial string of multidiameter (10) with gear II (4), tooth bar I (5) top is connected with measurement contact head (7), tooth bar I (5) middle part coincide with gear I (3), tooth bar I (5) bottom is connected with spring I (15), tooth bar II (6) middle part coincide with gear II (4), tooth bar II (6) top is connected to spring II (16), tooth bar II (6) bottom is connected with semi-girder (2) free end, multidiameter (10) is fixed in rolling bearing I (8) and rolling bearing II (9), rolling bearing I base and rolling bearing II base are by rolling bearing I (8), rolling bearing II (9) is fixed on rectangular metal box (17) inside, displacement position-limiting sleeve pipe (11) is integrated with measurement contact head (7), the lower end of displacement position-limiting sleeve pipe (11) and tooth bar I (5) are connected and are fixed on the upper end of can (17), tooth bar sleeve pipe I (12), one end of tooth bar sleeve pipe II (13) is welded on the inwall of can (17), tooth bar sleeve pipe I (12), the other end of tooth bar sleeve pipe II (13) is connected with tooth bar I (5) by notch, one end of tooth bar sleeve pipe III (14) is welded on the inwall of can (17), the other end of tooth bar sleeve pipe III (14) is connected with tooth bar II (6) by notch, optical fiber Bragg raster (1) is drawn external optical fiber (18) by optical fiber fairlead.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320748627.6U CN203687878U (en) | 2013-11-25 | 2013-11-25 | Displacement sensor based on gear rotary type fiber Bragg raster |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320748627.6U CN203687878U (en) | 2013-11-25 | 2013-11-25 | Displacement sensor based on gear rotary type fiber Bragg raster |
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|---|---|---|---|
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103644847A (en) * | 2013-11-25 | 2014-03-19 | 昆明理工大学 | A displacement sensor based on a gear rotary-type fiber Bragg raster and an application method thereof |
-
2013
- 2013-11-25 CN CN201320748627.6U patent/CN203687878U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103644847A (en) * | 2013-11-25 | 2014-03-19 | 昆明理工大学 | A displacement sensor based on a gear rotary-type fiber Bragg raster and an application method thereof |
| CN103644847B (en) * | 2013-11-25 | 2016-05-11 | 昆明理工大学 | A kind of based on the rotary optical fiber Bragg raster displacement transducer of gear and using method thereof |
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Granted publication date: 20140702 Termination date: 20141125 |
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Granted publication date: 20140702 Effective date of abandoning: 20160511 |
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