CN203811136U - Slope fiber Bragg grating multipoint displacement sensor - Google Patents
Slope fiber Bragg grating multipoint displacement sensor Download PDFInfo
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- CN203811136U CN203811136U CN201420213927.9U CN201420213927U CN203811136U CN 203811136 U CN203811136 U CN 203811136U CN 201420213927 U CN201420213927 U CN 201420213927U CN 203811136 U CN203811136 U CN 203811136U
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- optical fiber
- displacement
- side slope
- fiber bragg
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- 238000006073 displacement reaction Methods 0.000 title claims abstract description 126
- 239000000835 fiber Substances 0.000 title abstract description 5
- 239000013307 optical fiber Substances 0.000 claims abstract description 101
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 82
- 239000010959 steel Substances 0.000 claims abstract description 82
- 239000003822 epoxy resin Substances 0.000 claims abstract description 6
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 6
- 238000010079 rubber tapping Methods 0.000 claims abstract description 6
- 239000011435 rock Substances 0.000 claims description 10
- 230000003287 optical effect Effects 0.000 claims description 9
- 230000027455 binding Effects 0.000 claims description 6
- 238000009739 binding Methods 0.000 claims description 6
- 238000007596 consolidation process Methods 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 5
- 238000005259 measurement Methods 0.000 abstract description 8
- 230000007797 corrosion Effects 0.000 abstract description 2
- 238000005260 corrosion Methods 0.000 abstract description 2
- 238000012544 monitoring process Methods 0.000 description 8
- 239000002689 soil Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 231100000749 chronicity Toxicity 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000006855 networking Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
- 230000004304 visual acuity Effects 0.000 description 1
Abstract
The utility model relates to a slope fiber Bragg grating multipoint displacement sensor, and belongs to the technical field of photoelectron measurement. Upper end pull rod base tapping is connected with an upper end flange plate. The other end of the upper end pull rod is connected with an end of an upper end displacement spring. The other end of the upper end displacement spring is connected with an elastic steel plate. A fiber Bragg grating is stuck on the elastic steel plate. The lower end of the elastic steel plate is connected with an end of a lower end displacement spring. The other end of the lower end displacement spring is connected with a lower end pull rod. The lower end pull rod is connected with a lower end flange plate through base threads. A protection steel tube is disposed between the upper end flange plate and the lower end flange plate. The left side and the right side of the center of the protection steel tube are provided with holes through which an upper connection lead-out optical fiber and a lower connection lead-out optical fiber are respectively led out. A steel tube fiber lead-out hole is sealed by epoxy resin. Fixing ends of an upper end elastic protection annular sleeve and a lower end elastic protection annular sleeve are respectively connected with the upper end flange plate and the lower end flange plate. The sensor is good in anti-electromagnetic interference capability and corrosion resistance.
Description
Technical field
The utility model relates to a kind of side slope optical fiber Bragg raster multi-point displacement sensor, belongs to photoelectron field of measuring technique.
Background technology
China is the country on mountain more than, and mountain region accounts for 2/3 of national total area, is one of the country frequently that comes down in the world.The factors such as the component of landslide activity and sliding mass, mechanical property, form, stratiform, weak face, structural plane are relevant, and mechanism is comparatively complicated.Side slope internal displacement monitoring is the important topic that Geotechnical Engineering circle is paid close attention to always.Monitoring to Rock And Soil deep displacement, the general sensors such as bed rock displacement meter, multipoint displacement meter that adopt, sensing unit is installed on position, aperture, the transmission lever that connects different length, measure the displacement in the relative aperture of different depth anchored end, and by the deep fixed point of supposition, the distortion in convert each measuring point and aperture.
Traditional differential resistance type, steel chord type slope displacement meter have been widely used in the monitoring of side slope internal displacement, but there is larger deficiency in traditional slope displacement meter, as data acquisition instrument there will be drift error, measuring position point is limited, be not enough to the accurate location that judges that practical distortion occurs, because the distortion of transmission lever causes measured value distortion, to install complicatedly, difficulty of construction, cost are large.Side slope optical fiber Bragg raster multi-point displacement sensor have anti-electromagnetic interference (EMI), wide dynamic range, highly sensitive, be convenient to networking, remote and chronicity requirement, can realize the advantages such as distributed measurement, for solving above-mentioned key issue, provide good technological means.
While side slope multi-point displacement being carried out to real time on-line monitoring by employing side slope optical fiber Bragg raster multi-point displacement sensor, need to consider the formation of optical fiber Bragg raster multi-point displacement sensor, and how install to realize the protection problem to optical fiber while measuring.
Summary of the invention
The utility model provides a kind of side slope optical fiber Bragg raster multi-point displacement sensor, structure, the installation question of optical fiber Bragg raster multi-point displacement sensor when side slope multi-point displacement real-time online is detected for solving.
The technical solution of the utility model is: a kind of side slope optical fiber Bragg raster multi-point displacement sensor, comprises that optical fiber 8 is drawn by upper flanges dish 1, upper end resilient protection ring set 2, upper end pull bar 3, upper end displacement spring 4, protection steel pipe 5, elastic steel sheet 6, optical fiber Bragg raster 7, lower company, optical fiber 9, steel pipe optical fiber fairlead 10, lower end displacement spring 11, bottom end pulling bar 12, lower end ring flange 13, lower end resilient protection ring set 14 are drawn by upper company, wherein pull bar 3 base tappings in upper end are connected with upper flanges dish 1, the other end of upper end pull bar 3 is connected with one end of upper end displacement spring 4, the other end of upper end displacement spring 4 is connected with elastic steel sheet 6, optical fiber Bragg raster 7 sticks on elastic steel sheet 6, the lower end of elastic steel sheet 6 is connected with one end of lower end displacement spring 11, the other end of lower end displacement spring 11 connects bottom end pulling bar 12, bottom end pulling bar 12 is connected with lower end ring flange 13 by whorl of base, between upper flanges dish 1 and lower end ring flange 13, place protection steel pipe 5, the right and left perforate in the middle of the protection steel pipe 5 respectively company of drawing is drawn optical fiber 9 and optical fiber 8 is drawn by lower company, steel pipe optical fiber fairlead 10 use epoxy resin sealings, the stiff end of upper end resilient protection ring set 2 and lower end resilient protection ring set 14 respectively with upper flanges dish 1, lower end ring flange 13 is connected, free end nips protection steel pipe 5 outer walls.
Between described upper flanges dish 1, lower end ring flange 13 and protection steel pipe 5, leave gap.
A plurality of displacement transducers are drawn optical fiber 8 by lower company and are drawn optical fiber 9 with upper company and connect, and the displacement transducer after series connection is put into side slope hole 16 after by wire rope 15 bindings, then by cement-grouting consolidation in the side slope hole 16 of side slope rock stratum 17.
In displacement transducer after described series connection, the lower company of bottom displacement transducer draws optical fiber 8 connection armored optical cables and draws side slope hole 16.
In displacement transducer after described series connection, the upper company of tip displacement sensor draws optical fiber 9 connection armored optical cables and draws side slope hole 16.
Principle of work of the present utility model is:
Measuring position according in side slope hole 16 in side slope rock stratum 17, is together in series displacement transducer, with putting into side slope hole 16 after wire rope 15 binding, by cement-grouting consolidation in boring.When the soil layer of measuring position, displacement transducer place is subjected to displacement or ftracture in rock stratum, upper flanges dish 1 will drive upper end displacement spring 4 with lower end ring flange 13, lower end displacement spring 11 is done and is compressed or stretch, upper end displacement spring 4, lower end displacement spring 11 is converted into displacement to the pulling force of elastic steel sheet 6 or pressure, drive sticks on optical fiber Bragg raster 7 on elastic steel sheet 6 and stretches or compression, the displacement detecting of tested hole measurement point is converted into the modulation to optical fiber Bragg raster wavelength, by lower company, draw optical fiber 8 series connection displacement transducers, under the displacement transducer of bottom, connect and draw optical fiber 8 and connect armored optical cables and draw side slope hole 16, the sensor survival rate that two-way connected mode of lifting one's head is doubled, this structure forms side slope optical fiber Bragg raster multi-point displacement sensor.
Mathematics model analysis of the present utility model is as follows:
According to recklessly can law, upper end displacement spring 4,11 pairs of elastic steel sheet 6 applied forces of lower end displacement spring
f, mechanical equation:
F=
k·
x （1）
In formula,
kfor stiffness (stubborn) coefficient of spring,
xdisplacement for upper end displacement spring 4, lower end displacement spring 11.
L=2·
x （2）
In formula,
lfor the displacement of displacement transducer,
xdisplacement for upper end displacement spring 4, lower end displacement spring 11.
Elastic steel sheet 6 stress and deformation equations:
（3）
In formula,
efor the elastic modulus of elastic steel sheet 6,
sfor the cross-sectional area of elastic steel sheet 6,
lfor the length of elastic steel sheet 6, Δ
llength variations amount for elastic steel sheet 6.
The strain of elastic steel sheet 6 is:
（4）
(4) formula (3) formula of bringing into is obtained:
（5）
Stick on elastic steel sheet 6 optical fiber Bragg raster 7 and stretch with elastic steel sheet, if in measuring process temperature variation Δ
t, the wavelength-shift amount of the optical fiber Bragg raster that strain and temperature cause
for:
（6）
In formula,
for strain sensitive coefficient;
s t for temperature-sensitivity coefficient;
for optical fiber Bragg raster 7 strains; Δ
tfor temperature variation;
centre wavelength for optical fiber Bragg raster 7.By additional temperature sensor, determine
, in formula (6), eliminating the impact of temperature, can obtain:
（7）
In formula,
wavelength-shift for the optical fiber Bragg raster that caused by strain.
(5) formula (7) formula of bringing into is obtained:
（8）
(1), (2) formula are brought into (8) formula and are obtained:
（9）
Formula (9) has shown the displacement of tested hole measurement point
with optical fiber Bragg raster wavelength
between mathematical model, by measuring optical fiber Bragg grating wavelength displacement, just can calculate the displacement of tested hole measurement point.
The beneficial effects of the utility model are:
1, spring handle displacement is converted into the pulling force of elastic steel sheet or pressure, drive sticks on optical fiber Bragg raster on elastic steel sheet and stretches or compression, the displacement detecting of tested hole measurement point is converted into the modulation to optical fiber Bragg raster wavelength, and the displacement of optical fiber Bragg raster wavelength-shift and tested hole measurement point has linear relationship.
2, according to the monitoring location of different depth in side slope hole, displacement transducer is together in series, with after wire rope binding, puts into side slope hole, by cement-grouting consolidation in boring.Can be according to the difference of monitoring requirements, the displacement transducer of series connection varying number is realized the multi-point displacement monitoring of side slope hole.
3, by adopting optical fiber Bragg raster, there is stronger anti-electromagnetic interference capability and corrosion resistance and be applicable to the long term monitoring to side slope.
4, simple in structure, convenient operation.
Accompanying drawing explanation
Fig. 1 is the structural representation of displacement transducer in the utility model;
Fig. 2 is side slope multi-point displacement sensor mounting structure schematic diagram in the utility model;
Fig. 3 is with the ring flange schematic side view of resilient protection ring set in the utility model;
Fig. 4 protects steel pipe schematic side view in the utility model;
Fig. 5 is the syndeton schematic diagram of pull bar, spring, elastic steel sheet, optical fiber Bragg raster in the utility model;
Each label in figure: 1 draws optical fiber, 9 for optical fiber Bragg raster, 8 for lower company for elastic steel sheet, 7 for protection steel pipe, 6 for upper end displacement spring, 5 for upper end pull bar, 4 for upper end resilient protection ring set, 3 for upper flanges dish, 2 draws optical fiber, 10 for steel pipe optical fiber fairlead, 11 is for lower end displacement spring, 12 is for bottom end pulling bar, 13 is for lower end ring flange, 14 is for lower end resilient protection ring set, 15 is for wire rope, 16 is for side slope hole, 17 is for side slope rock stratum for upper company.
Embodiment
Embodiment 1: as Figure 1-5, a side slope optical fiber Bragg raster multi-point displacement sensor, comprises that optical fiber 8 is drawn by upper flanges dish 1, upper end resilient protection ring set 2, upper end pull bar 3, upper end displacement spring 4, protection steel pipe 5, elastic steel sheet 6, optical fiber Bragg raster 7, lower company, optical fiber 9, steel pipe optical fiber fairlead 10, lower end displacement spring 11, bottom end pulling bar 12, lower end ring flange 13, lower end resilient protection ring set 14 are drawn by upper company, wherein pull bar 3 base tappings in upper end are connected with upper flanges dish 1, the other end of upper end pull bar 3 is connected with one end of upper end displacement spring 4, the other end of upper end displacement spring 4 is connected with elastic steel sheet 6, optical fiber Bragg raster 7 sticks on elastic steel sheet 6, the lower end of elastic steel sheet 6 is connected with one end of lower end displacement spring 11, the other end of lower end displacement spring 11 connects bottom end pulling bar 12, bottom end pulling bar 12 is connected with lower end ring flange 13 by whorl of base, between upper flanges dish 1 and lower end ring flange 13, place protection steel pipe 5, the right and left perforate in the middle of the protection steel pipe 5 respectively company of drawing is drawn optical fiber 9 and optical fiber 8 is drawn by lower company, steel pipe optical fiber fairlead 10 use epoxy resin sealings, the stiff end of upper end resilient protection ring set 2 and lower end resilient protection ring set 14 respectively with upper flanges dish 1, lower end ring flange 13 is connected, free end nips protection steel pipe 5 outer walls.
Embodiment 2: as Figure 1-5, a side slope optical fiber Bragg raster multi-point displacement sensor, comprises that optical fiber 8 is drawn by upper flanges dish 1, upper end resilient protection ring set 2, upper end pull bar 3, upper end displacement spring 4, protection steel pipe 5, elastic steel sheet 6, optical fiber Bragg raster 7, lower company, optical fiber 9, steel pipe optical fiber fairlead 10, lower end displacement spring 11, bottom end pulling bar 12, lower end ring flange 13, lower end resilient protection ring set 14 are drawn by upper company, wherein pull bar 3 base tappings in upper end are connected with upper flanges dish 1, the other end of upper end pull bar 3 is connected with one end of upper end displacement spring 4, the other end of upper end displacement spring 4 is connected with elastic steel sheet 6, optical fiber Bragg raster 7 sticks on elastic steel sheet 6, the lower end of elastic steel sheet 6 is connected with one end of lower end displacement spring 11, the other end of lower end displacement spring 11 connects bottom end pulling bar 12, bottom end pulling bar 12 is connected with lower end ring flange 13 by whorl of base, between upper flanges dish 1 and lower end ring flange 13, place protection steel pipe 5, the right and left perforate in the middle of the protection steel pipe 5 respectively company of drawing is drawn optical fiber 9 and optical fiber 8 is drawn by lower company, steel pipe optical fiber fairlead 10 use epoxy resin sealings, the stiff end of upper end resilient protection ring set 2 and lower end resilient protection ring set 14 respectively with upper flanges dish 1, lower end ring flange 13 is connected, free end nips protection steel pipe 5 outer walls.
Between described upper flanges dish 1, lower end ring flange 13 and protection steel pipe 5, leave gap.
A plurality of displacement transducers are drawn optical fiber 8 by lower company and are drawn optical fiber 9 with upper company and connect, and the displacement transducer after series connection is put into side slope hole 16 after by wire rope 15 bindings, then by cement-grouting consolidation in the side slope hole 16 of side slope rock stratum 17.
In displacement transducer after described series connection, the lower company of bottom displacement transducer draws optical fiber 8 connection armored optical cables and draws side slope hole 16.
In displacement transducer after described series connection, the upper company of tip displacement sensor draws optical fiber 9 connection armored optical cables and draws side slope hole 16.
Embodiment 3: as Figure 1-5, a side slope optical fiber Bragg raster multi-point displacement sensor, comprises that optical fiber 8 is drawn by upper flanges dish 1, upper end resilient protection ring set 2, upper end pull bar 3, upper end displacement spring 4, protection steel pipe 5, elastic steel sheet 6, optical fiber Bragg raster 7, lower company, optical fiber 9, steel pipe optical fiber fairlead 10, lower end displacement spring 11, bottom end pulling bar 12, lower end ring flange 13, lower end resilient protection ring set 14 are drawn by upper company, wherein pull bar 3 base tappings in upper end are connected with upper flanges dish 1, the other end of upper end pull bar 3 is connected with one end of upper end displacement spring 4, the other end of upper end displacement spring 4 is connected with elastic steel sheet 6, optical fiber Bragg raster 7 sticks on elastic steel sheet 6, the lower end of elastic steel sheet 6 is connected with one end of lower end displacement spring 11, the other end of lower end displacement spring 11 connects bottom end pulling bar 12, bottom end pulling bar 12 is connected with lower end ring flange 13 by whorl of base, between upper flanges dish 1 and lower end ring flange 13, place protection steel pipe 5, the right and left perforate in the middle of the protection steel pipe 5 respectively company of drawing is drawn optical fiber 9 and optical fiber 8 is drawn by lower company, steel pipe optical fiber fairlead 10 use epoxy resin sealings, the stiff end of upper end resilient protection ring set 2 and lower end resilient protection ring set 14 respectively with upper flanges dish 1, lower end ring flange 13 is connected, free end nips protection steel pipe 5 outer walls.
Between described upper flanges dish 1, lower end ring flange 13 and protection steel pipe 5, leave gap.
A plurality of displacement transducers are drawn optical fiber 8 by lower company and are drawn optical fiber 9 with upper company and connect, and the displacement transducer after series connection is put into side slope hole 16 after by wire rope 15 bindings, then by cement-grouting consolidation in the side slope hole 16 of side slope rock stratum 17.
In displacement transducer after described series connection, the lower company of bottom displacement transducer draws optical fiber 8 connection armored optical cables and draws side slope hole 16.
In displacement transducer after described series connection, the upper company of tip displacement sensor draws optical fiber 9 connection armored optical cables and draws side slope hole 16.
Its design parameter is:
1, the dimensional parameters of elastic steel sheet is: length is
lfor 40mm, width
bfor 3mm, 45# steel Young ' s modulus is
e=200GPa, thickness
hfor 1mm, the cross-sectional area of elastic steel sheet
s=3*1mm
2;
2, the technical parameter of optical fiber Bragg raster is: centre wavelength
=1550 nm,
;
3, the stiffness of spring (stubborn) coefficient is
k=10N/cm;
4, press accompanying drawing 1-5 configuration experiment;
5, with fiber Bragg grating (FBG) demodulator, obtain the Bragg wavelength of optical fiber Bragg raster;
6, according to formula (9), by the Bragg wavelength-shift of optical fiber Bragg raster
can calculate the measuring position change in displacement that side slope hole soil layer is subjected to displacement or rock stratum generation cracking causes
;
7, according to formula (9), the Bragg wavelength-shift of optical fiber Bragg raster
response sensitivity to the displacement of tested hole measurement point:
;
By each known quantity substitution above formula, theory is calculated and is shown, the sensitivity of this displacement transducer is 10.075pm/cm; When being 1 pm, the wavelength resolution power of optical fiber Bragg raster (FBG) demodulator (refers to
during every variation 1 pm), the displacement resolving power of this sensor is 0.0993cm.
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 (5)
1. a side slope optical fiber Bragg raster multi-point displacement sensor, is characterized in that: comprise that optical fiber (8) is drawn by upper flanges dish (1), upper end resilient protection ring set (2), upper end pull bar (3), upper end displacement spring (4), protection steel pipe (5), elastic steel sheet (6), optical fiber Bragg raster (7), lower company, optical fiber (9), steel pipe optical fiber fairlead (10), lower end displacement spring (11), bottom end pulling bar (12), lower end ring flange (13), lower end resilient protection ring set (14) are drawn by upper company, wherein upper end pull bar (3) base tapping is connected with upper flanges dish (1), the other end of upper end pull bar (3) is connected with one end of upper end displacement spring (4), the other end of upper end displacement spring (4) is connected with elastic steel sheet (6), optical fiber Bragg raster (7) sticks on elastic steel sheet (6), the lower end of elastic steel sheet (6) is connected with one end of lower end displacement spring (11), the other end of lower end displacement spring (11) connects bottom end pulling bar (12), bottom end pulling bar (12) is connected with lower end ring flange (13) by whorl of base, between upper flanges dish (1) and lower end ring flange (13), place protection steel pipe (5), the right and left perforate in the middle of protection steel pipe (5) the respectively company of drawing is drawn optical fiber (9) and optical fiber (8) is drawn by lower company, epoxy resin sealing for steel pipe optical fiber fairlead (10), the stiff end of upper end resilient protection ring set (2) and lower end resilient protection ring set (14) respectively with upper flanges dish (1), lower end ring flange (13) is connected, free end nips protection steel pipe (5) outer wall.
2. side slope optical fiber Bragg raster multi-point displacement sensor according to claim 1, is characterized in that: between described upper flanges dish (1), lower end ring flange (13) and protection steel pipe (5), leave gap.
3. side slope optical fiber Bragg raster multi-point displacement sensor according to claim 1, it is characterized in that: a plurality of displacement transducers are drawn optical fiber (8) by lower company and drawn optical fiber (9) with upper company and connect, displacement transducer after series connection is put into side slope hole (16) by after wire rope (15) binding, then by cement-grouting consolidation in the side slope hole (16) of side slope rock stratum (17).
4. side slope optical fiber Bragg raster multi-point displacement sensor according to claim 3, is characterized in that: in the displacement transducer after described series connection, the lower company of bottom displacement transducer draws optical fiber (8) connection armored optical cable and draws side slope hole (16).
5. side slope optical fiber Bragg raster multi-point displacement sensor according to claim 3, is characterized in that: in the displacement transducer after described series connection, the upper company of tip displacement sensor draws optical fiber (9) connection armored optical cable and draws side slope hole (16).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420213927.9U CN203811136U (en) | 2014-04-29 | 2014-04-29 | Slope fiber Bragg grating multipoint displacement sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420213927.9U CN203811136U (en) | 2014-04-29 | 2014-04-29 | Slope fiber Bragg grating multipoint displacement sensor |
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| Publication Number | Publication Date |
|---|---|
| CN203811136U true CN203811136U (en) | 2014-09-03 |
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ID=51449874
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|---|---|---|---|
| CN201420213927.9U Expired - Fee Related CN203811136U (en) | 2014-04-29 | 2014-04-29 | Slope fiber Bragg grating multipoint displacement sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104006744A (en) * | 2014-04-29 | 2014-08-27 | 昆明理工大学 | Side slop optical fiber Bragg optical grating multi-point displacement sensor and using method thereof |
-
2014
- 2014-04-29 CN CN201420213927.9U patent/CN203811136U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104006744A (en) * | 2014-04-29 | 2014-08-27 | 昆明理工大学 | Side slop optical fiber Bragg optical grating multi-point displacement sensor and using method thereof |
| CN104006744B (en) * | 2014-04-29 | 2016-09-21 | 昆明理工大学 | A kind of side slope optical fiber Bragg raster multi-point displacement sensor and using method thereof |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140903 Termination date: 20150429 |
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| EXPY | Termination of patent right or utility model |