CN205691078U - Distributed deformation measurement apparatus and optical fiber grating inclination angle sensor, structure - Google Patents
Distributed deformation measurement apparatus and optical fiber grating inclination angle sensor, structure Download PDFInfo
- Publication number
- CN205691078U CN205691078U CN201620639760.1U CN201620639760U CN205691078U CN 205691078 U CN205691078 U CN 205691078U CN 201620639760 U CN201620639760 U CN 201620639760U CN 205691078 U CN205691078 U CN 205691078U
- Authority
- CN
- China
- Prior art keywords
- fiber grating
- optical fiber
- inclination angle
- angle sensor
- shell
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Length Measuring Devices By Optical Means (AREA)
- Optical Transform (AREA)
Abstract
A kind of distributed deformation measurement apparatus and optical fiber grating inclination angle sensor, structure, including: shell, shell is the hollow cylinder that bottom is open；A pair beam of uniform strength, is separately positioned on opposite side in shell, and the couple positioned opposite on the inner surface of a pair beam of uniform strength or outer surface has two fiber gratings to place position；Weight, is arranged on the bottom of shell, and the two ends of weight are fixed with a pair beam of uniform strength respectively.Owing to fiber grating places position at opposite side, so that when deformation, fiber grating places in position one by normal strain effect, another is by negative strain effect, the difference information of the wavelength shift of employing fiber grating is as output signal, therefore, it is possible to eliminate the temperature error during detection, then, improve the accuracy of detection of optical fiber grating inclination angle sensor.
Description
Technical field
The present invention relates to sensor detection field, be specifically related to a kind of distributed deformation measurement apparatus and fiber grating inclination angle
Sensor, structure.
Background technology
To vertically differing heights or the inclination of depth, deformation information monitoring at skyscraper, electric power ferrum
The engineering field such as tower, high slope is extremely important, by monitoring, can grasp their inclination, deformation and its variation tendency.
In the measurement technology of this inclination or deformation, traditional electric inclinometer application is very universal, such as at the deformation monitoring of side slope
In, staff, by vertically holing inside side slope, imbeds business inclinometer pipe, electricity inclinometer is put into inclinometer pipe
In, from the beginning of the bottom of inclinometer pipe, promote electricity inclinometer according to the interval waiting height successively, re-record down the electricity at each height
The deformation values that inclinometer measurement is arrived, obtains side slope vertically differing heights distributed deformation information.This measuring method, by
Output signal in electricity inclinometer is light current, on the one hand, the anti-electromagnetic interference capability of instrument is poor, and reading is unstable；On the other hand,
Each measurement of staff all must arrive side slope field conduct, and work carries out the most inconvenient, different staff by subjectivity
Reading result after impact is also easily different, and cannot accomplish to monitor in real time, cannot in real time, slap timely to slope deforming
Hold.Fiber grating sensing technology because of its electromagnetism interference, can the concatenation multiplexing of multiple sensors, be prone to networking measure, can be remotely real
Time the outstanding advantage such as monitoring, the real-time monitoring being highly suitable in the field extreme environments such as side slope, therefore based on fiber grating
The research that the distributed deformation of principle measures technology is continuous.
In prior art, such as document " side slope based on fiber grating sensing technology deviational survey and stability assessment side in situ
Method " and " high gradient slope based on fiber grating and rockfall monitoring technology and applied research ", and Publication No.
In the Chinese patent " a kind of fiber bragg grating inclinometer and inclinometry algorithm " of 101713650A, it is all that fiber grating equal length is spaced
Be directly adhered to inclinometer pipe surface, inclinometer pipe produces flexural deformation, fiber grating perception deviational survey under the effect of slope deforming
The bending strain of pipe, by measuring fiber grating wave length shift under bending strain effect, draws the stress distribution of inclinometer pipe
Information, recycles these stress distribution information, binding isotherm algorithm, derives the deformation information of inclinometer pipe.Prior art is not
Foot is: owing to fiber grating is affixed directly to inclinometer pipe surface, the inclinometer pipe bending strain of fiber grating location for paste is not necessarily
For homogeneous strain, effects of strain heterogeneous can make fiber grating produce chirp phenomenon, cause optical fiber grating sensing to lose efficacy；Existing
Technology provide theoretical algorithm, need by fiber grating measurement to the anti-corner information releasing inclinometer pipe of bending strain, then
Derive deformation information, calculate trouble and error is big；Fiber grating is affixed directly to inclinometer pipe surface, and embedment is to engineerings such as side slopes
After internal use, it is impossible to take out and be re-applied to Other Engineering, nonrepeatability uses, and cost is high.
Summary of the invention
The technical problem to be solved in the present invention is to reduce the detection error utilizing fiber grating to measure distributed deformation, carries
High measurement accuracy.
To this end, according to first aspect, the open a kind of optical fiber grating inclination angle sensor structure of the embodiment of the present invention, including:
Shell, shell is the hollow cylinder that bottom is open；A pair beam of uniform strength, is separately positioned on opposite side in shell, and one
Couple positioned opposite on the inner surface of equivalent intensities beam or outer surface has fiber grating to place position；Weight, is arranged on shell
Bottom, the two ends of weight are fixed with a pair beam of uniform strength respectively.
Further, also including: multiple guide protrusions, multiple guide protrusions are arranged on the outer surface of shell；Multiple guiding are convex
Rise and match with multiple target recess respectively.
Further, also including: top board, being connected with the top of shell, the top of a pair beam of uniform strength is connected with top board respectively；
Offering the top board through hole running through its upper and lower surface on top board, top board through hole connects with the fiber through hole of hollow cylinder.
Further, the upper surface of shell is provided with bail.
Further, also include: bottom, be connected with the bottom of shell, so that hollow cylinder is sealed；Offer on bottom
Running through the bottom through hole of its upper and lower surface, bottom through hole connects with hollow cylinder.
Further, the lower surface of bottom is provided with bail.
According to second aspect, the open a kind of optical fiber grating inclination angle sensor of the embodiment of the present invention, including:
Above-mentioned optical fiber grating inclination angle sensor structure；A pair fiber grating, is separately positioned on the light of a pair beam of uniform strength
Fine grating places position.
According to the third aspect, the open a kind of distributed deformation measurement apparatus of the embodiment of the present invention, including:
N above-mentioned optical fiber grating inclination angle sensor of cascade, n is the integer more than or equal to 2；Outside this grade of sensor
The bottom of shell is connected to the top of the shell of subordinate's sensor by rope；The tail optical fiber of each fiber grating is serially connected with same optical fiber；
Business inclinometer pipe, for hollow structure, internal fluted, n the described fiber grating for the described cascade of detachable placement inclines
Angle transducer.
Further, equation below is used to obtain relative horizontal displacement di+1: di+1=Lsin θi+1。
Technical solution of the present invention, has the advantage that
The technical scheme that the embodiment of the present invention provides, arranges a pair beam of uniform strength due on opposite side in the enclosure, waits strong
Couple positioned opposite on the degree inner surface of beam or outer surface has fiber grating to place position, and, a pair beam of uniform strength respectively with
The two ends of weight are fixed, thus when run-off the straight, under the effect of this weight so that this pair beam of uniform strength deforms upon,
The fiber grating placed on position by being placed on fiber grating can collect this tilting value, owing to fiber grating places position in phase
Offside so that when deformation, fiber grating place in position one by normal strain effect, another, can by negative strain effect
Using use the difference information of the wavelength shift of fiber grating as output signal, therefore, it is possible to reduce the temperature during detection
Degree error, then, improves the accuracy of detection of optical fiber grating inclination angle sensor.
As preferred technical scheme, the outer surface at shell arranges multiple guide protrusions, and the plurality of guide protrusions is respectively
Match with multiple target recess, thus so that optical fiber grating inclination angle sensor can preferably be fitted in target business inclined tube
In, and can move according to the target trajectory that multiple target recess are formed.
As preferred technical scheme, top board offers the fiber through hole running through its upper and lower surface, fiber through hole with
Hollow cylinder connects, and offers the bottom through hole running through its upper and lower surface on bottom, and bottom through hole connects with hollow cylinder, from
And make the fiber grating that is arranged in hollow cylinder can be by this fiber through hole or bottom through hole and higher level's fiber grating
Or subordinate's fiber grating concatenates, it is achieved the multiplexing of multiple fiber gratings.
For distributed deformation measurement apparatus, owing to having cascaded n optical fiber grating inclination angle sensor, thus so that this point
Cloth deformation measuring device can be seated in longer business inclinometer pipe, to the deformation of each target area in business inclinometer pipe
Tilt to detect.
Additionally, when completing after certain survey engineering terminates, even if after business inclinometer pipe measures object because of fixing or embedment
Cannot take out, n optical fiber grating inclination angle sensor of cascade then can take out, when reusing from business inclinometer pipe, it is only necessary to
Other business inclinometer pipe is set, then n optical fiber grating inclination angle sensor of cascade is put in inclinometer pipe, thus so that level
The sensor of connection can be reused, and has saved measurement cost.
As preferred technical scheme, the upper surface of top board is provided with bail, the lower surface of bottom is provided with bail,
So that the optical fiber grating inclination angle sensor of the superior and the subordinate can carry out machinery concatenation by these bails respectively.
Accompanying drawing explanation
In order to be illustrated more clearly that the specific embodiment of the invention or technical scheme of the prior art, below will be to specifically
In embodiment or description of the prior art, the required accompanying drawing used is briefly described, it should be apparent that, in describing below
Accompanying drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not paying creative work
Put, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is a kind of optical fiber grating inclination angle sensor structural representation in the embodiment of the present invention；
Fig. 2 is a kind of optical fiber grating inclination angle sensor plane simplified schematic diagram in the embodiment of the present invention；
Fig. 3 a and Fig. 3 b is a kind of distributed deformation measurement apparatus structural representation in the embodiment of the present invention, and wherein, Fig. 3 a is
A kind of view when distributed deformation measurement apparatus is measured, Fig. 3 b is the another during measurement of distributed deformation measurement apparatus
Plant view；
Fig. 4 is a kind of distributed deformation measuring method flow chart in the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, technical scheme is clearly and completely described, it is clear that described enforcement
Example is a part of embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention, ordinary skill
The every other embodiment that personnel are obtained under not making creative work premise, broadly falls into the scope of protection of the invention.
In describing the invention, it should be noted that term " " center ", " on ", D score, "left", "right", " vertically ",
Orientation or the position relationship of the instruction such as " level ", " interior ", " outward " they are based on orientation shown in the drawings or position relationship, merely to
Be easy to describe the present invention and simplifying describe rather than instruction or the hint device of indication or element must have specific orientation,
With specific azimuth configuration and operation, therefore it is not considered as limiting the invention.Additionally, term " first ", " second ",
" the 3rd " is only used for describing purpose, and it is not intended that indicate or hint relative importance.
In describing the invention, it should be noted that unless otherwise clearly defined and limited, term " is installed ", " phase
Even ", " connection " should be interpreted broadly, for example, it may be fixing connection, it is also possible to be to removably connect, or be integrally connected；Can
To be mechanical connection, it is also possible to be electrical connection；Can be to be joined directly together, it is also possible to be indirectly connected to by intermediary, it is also possible to
It is the connection of two element internals, can be wireless connections, it is also possible to be wired connection.For those of ordinary skill in the art
For, above-mentioned term concrete meaning in the present invention can be understood with concrete condition.
If additionally, the most non-structure of technical characteristic involved in invention described below difference embodiment
Become conflict just can be combined with each other.
Refer to Fig. 1, a kind of optical fiber grating inclination angle sensor structure disclosed in the present embodiment, including: shell 1, a pair
The beam of uniform strength 10 and weight 13, wherein:
The hollow cylinder that shell 1 opens for bottom.It should be noted that in a particular embodiment, alleged hollow cylinder can
There to be certain deviation from circular from, it is also possible to be the hollow cylinder structure of similar cylinder.
A pair beam of uniform strength 10 is separately positioned on opposite side in shell 1, the inner surface of this pair beam of uniform strength 10 or outer
Couple positioned opposite on surface has fiber grating to place position.In a particular embodiment, in a preferred embodiment, this equity is strong
Degree beam 10 is isosceles triangle elastic sheet, is arranged on hollow cylinder in the shape of falling isoceles triangle, so that what the beam of uniform strength 10 was subject to
Strain is uniformly distributed.
Weight 13 is arranged on the bottom of shell 1, and the two ends of weight 13 are fixed with a pair beam of uniform strength 10 respectively.Concrete real
Executing in example, weight 13 can be the object of the regular shapes such as cylinder, so that the weight distribution equilibrium of weight 13.For ease of weight
The two ends of thing 13 are fixed with a pair beam of uniform strength 10 respectively, it is preferable that weight 13 is cube, and weight 13 connects with the beam of uniform strength 10
The weight screwed hole corresponding with equal strength top through hole is had, to realize the two ends of weight 13 respectively with one on the two sides touched
Equivalent intensities beam 10 is fixed.
In a preferred embodiment, refer to Fig. 1, this optical fiber grating inclination angle sensor structure also includes: multiple guiding are convex
Playing 2, multiple guide protrusions 2 are arranged on the outer surface of shell 1, and multiple guide protrusions 2 match with multiple target recess respectively.?
In specific embodiment, the length of guide protrusions 2 is identical with the length of shell 1, when arranging guide protrusions 2, and can be by interval
180 ° are arranged, and each guide protrusions 2 can be in semi-cylindrical.In the present embodiment, in alleged target recess is business inclinometer pipe
Groove.
In a preferred embodiment, refer to Fig. 1, this optical fiber grating inclination angle sensor structure also includes: top board 6, with outward
The top of shell 1 connects, and the top of a pair beam of uniform strength 10 is connected with top board 6 respectively, top board 6 offers and runs through its upper and lower surface
Top board through hole 7, top board through hole 7 connects with the fiber through hole 4 of hollow cylinder.In a particular embodiment, top board 6 can be rectangle
Cube, top board through hole 7 is preferably opened in the geometric center position of top board 6.In an alternate embodiment of the invention, offer on the top plate 6
The top board screwed hole corresponding with the screwing through hole on hollow cylinder upper strata, uses such as 2 screws through screwing through hole and to be screwed in top
In plate screwed hole, it is achieved top board is fixing with shell.
In a preferred embodiment, refer to Fig. 1, the upper surface of shell 1 is provided with bail 3, implement optional
In example, bail 3 is preferably provided at the geometric center position of shell 1.In order to top board 6 and hollow cylinder fixing is better achieved,
In a preferred embodiment, on shell 1, screwing through hole 5 can be had in the both sides of bail 3, then, offer top board on the top plate 6
Screwed hole 8, the position of top board screwed hole 8 is corresponding with screwing through hole 5 respectively, solid with the top of hollow cylinder to realize top board 6
Fixed；6 two sides of top board have at least one pair of flank threads hole 9, to realize top board 6 and a pair beam of uniform strength 10
Fixing.In a preferred embodiment, the center of circle of 3, two screwing through hole 5 of bail and guide protrusions 2 is on the same line.
In a preferred embodiment, refer to Fig. 1, this optical fiber grating inclination angle sensor structure also includes: bottom 16, bottom
16 are connected with the bottom of shell 1, to seal hollow cylinder；Offer on bottom 16 run through its upper and lower surface bottom lead to
Hole 17, bottom through hole 17 connects with hollow cylinder, and as optional embodiment, bottom through hole 17 is preferably opened in the several of bottom 16
What center.As optional embodiment, bottom 16 is preferably "convex" shaped, and bottom 16 top is provided with external screw thread, can be with shell 1
The screw-internal thread fit of lower section, the outside diameter of bottom 16 bottom is identical with shell 1 external diameter, and bottom 16 and shell 1 are filled by screw thread
Shell 1 can be closed after joining.It is also equipped with bail, at the bail of bottom 16 lower surface at bottom 16 lower surface geometric center
Position is provided with bottom through hole 17.
In the specific implementation, for realizing being connected of each parts, can offer or arrange corresponding on each parts
Connector.As an example, the top of two beam of uniform strengths 10 is provided with the top through hole that the flank threads hole 9 with top board 6 is mated
11, the bottom of the beam of uniform strength 10 is provided with bottom through hole 12.Weight 13 upper and lower surface be provided centrally with weight through hole 14, two
Side is arranged the weight screwed hole 15 coordinated with bottom through hole 12 respectively, is realized by weight screwed hole 15 and bottom through hole 12
Weight is fixing with the beam of uniform strength 10.
Refer to Fig. 2, the present embodiment also discloses a kind of optical fiber grating inclination angle sensor, including: above-described embodiment is open
Optical fiber grating inclination angle sensor structure and a pair fiber grating (FBG1 and FBG2), this pair fiber grating (FBG1 and
FBG2) fiber grating being separately positioned on a pair beam of uniform strength 10 places position.In a particular embodiment, by two fiber gratings
(FBG1 and FBG2) is serially connected on an optical fiber, specifically, such as, fiber grating FBG1 is pasted onto the beam of uniform strength 10 in left side
Inner surface, fiber grating FBG2 is pasted onto the inner surface of the beam of uniform strength 10 on right side, or fiber grating FBG1 is pasted
At the outer surface of the beam of uniform strength 10 in left side, fiber grating FBG2 is pasted onto the outer surface of the beam of uniform strength 10 on right side.Then
Two beam of uniform strengths 10 being pasted with fiber grating are fixed by screws in two sides of top board 6, and re-using screw will top
It is internal that plate 6 is fixed on shell 1.Two sections of tail optical fibers 18 of fiber grating FBG1 and fiber grating FBG2, the tail optical fiber 18 of upper end is worn successively
Leading to the outside of shell 1 after crossing top board through hole 7 and fiber through hole 4, the tail optical fiber 18 of lower end sequentially passes through weight through hole 14 and the end
Lead to after lid through hole 17 outside of bottom 16, finally the external screw thread on bottom 16 top is screwed into the female thread below shell 1, real
The closing of existing shell 1.
The operation principle of optical fiber grating inclination angle sensor disclosed in the present embodiment is: when optical fiber grating inclination angle sensor is along outward
When axially vertically placing of shell 1, is set to without heeling condition；When optical fiber grating inclination angle sensor produces tilting value (inclination angle) θ,
Two beam of uniform strengths 10 occur bending and deformation under the action of gravity of weight 13, if being pasted onto the beam of uniform strength 10 surface, left side
Fiber grating FBG1 is by after normal strain effect, and wavelength shift is Δ λ1, it is pasted onto the optical fiber on the beam of uniform strength 10 surface, right side
Grating FBG 2 is then by the negative strain that size is identical, and wavelength shift is Δ λ2, whereas if fiber grating FBG1 is answered by negative
Become, then fiber grating FBG2 will be by normal strain.By the difference information Δ λ of the wavelength shift of FBG1 and FBG212=Δ λ1-Δ
λ2, it is used for detecting tilting value θ.The wave length shift of FBG1 with FBG2 is equal in magnitude but in opposite direction, by the difference of wavelength shift
Information Δ λ12=Δ λ1-Δλ2As the output signal of sensor, not only increase measurement sensitivity, and, by ambient temperature
The wavelength that brings of change in the same direction, etc. value drift eliminate after difference.Under lab, optical fiber grating inclination angle sensor is fixed on
After on the calibrating table of inclination angle, the access signal of two fiber gratings is demodulated in instrument, monitor the wavelength shift of FBG1 and FBG2
Difference signal Δ λ12=Δ λ1-Δλ2.Inclination angle calibrating table arranges multiple different heeling condition, it is thus achieved that different tilting value θ
With Δ λ12Corresponding relation after, tilting value is set to X-axis, Δ λ12Be set to Y-axis, by curve matching, can draw θ with
Δλ12Functional relationship.
The present embodiment also discloses a kind of distributed deformation measurement apparatus, including: the n of cascade above-mentioned fiber grating inclines
Angle transducer, wherein, n is the integer more than or equal to 2；The bottom of the shell 1 of this grade of sensor is connected to subordinate by rope
The top of the shell 1 of sensor；The tail optical fiber of each fiber grating is serially connected with same optical fiber；Business inclinometer pipe 20, has hollow structure,
Inside has the groove for guiding n optical fiber grating inclination angle sensor, business inclinometer pipe 20 to be used for carrying above-mentioned cascade
N optical fiber grating inclination angle sensor.In an alternate embodiment of the invention, the groove within business inclinometer pipe 20 and the guiding of sensor
Protruding 2 couplings, realize guiding n optical fiber grating inclination angle sensor to coordinate.As example, refer to Fig. 3 a and figure
3b, n optical fiber grating inclination angle sensor is connected with each other, and utilizes one end colligation of the steel wire rope 19 that some sections of preferred equal lengths are L
On bail 3 on a certain sensor outer housing 1, the other end colligation of steel wire rope 19 bail 3 on another sensor bottom 16
On, it is achieved the connection between sensor, certainly, in other embodiments, it is also possible to be the steel wire rope 19 of Length discrepancy.Each sensing
The tail optical fiber 18 that device is drawn is by realizing concatenation after the welding of optical fiber bonding machine, and after ensureing the concatenation between two sensors
The length of tail optical fiber 18 more than the length of steel wire rope.Fiber grating inside each optical fiber grating inclination angle sensor (such as FBG1,
FBG2) centre wavelength value is the most different, after the tail optical fiber signal after concatenation accesses signal demodulation instrument, can check the ripple of each sensor
Long signal.
The present embodiment also discloses a kind of distributed deformation measurement side using above-mentioned distributed deformation measurement apparatus to realize
Method, refer to Fig. 3 a and 3b, during engineer applied, business inclinometer pipe 20 is first vertically imbedded side slope, is vertically bundled in skyscraper
Deng monitoring object in, n the optical fiber grating inclination angle sensor then the interconnected groove along business inclinometer pipe 20 one by one
(target recess) is put into, be positioned at an optical fiber grating inclination angle sensor topmost hang fixing after, the most all of fiber grating
Obliquity sensor all by steel wire hang inside business inclinometer pipe 20, finally the tail optical fiber 18 of fiber grating access signal demodulation
Instrument.When business inclinometer pipe 20 is along with monitoring object deformation, the wavelength shift difference of each optical fiber grating inclination angle sensor
Signal delta λ12=Δ λ1-Δλ2Change, according to demarcating θ and the Δ λ obtained12Functional relationship, converse each optical fiber light
The tilting value θ of pitch of shed sensor present position, finally combines the measurement side of the distributed deformation measurement apparatus that the application provides
Method, obtains the horizontal distortion displacement of each sensor position, it is achieved the distributed measurement of horizontal distortion at different depth.Please
With reference to Fig. 4, for the present embodiment distributed deformation measuring method flow chart, this measuring method comprises the steps:
Step S100, optical fiber grating inclination angle sensor inclination angle gathers.Gather the signal of each optical fiber grating inclination angle sensor
Obtain the inclination angle theta of each optical fiber grating inclination angle sensor feedback, specifically, gather the letter of i+1 optical fiber grating inclination angle sensor
Number obtain the inclination angle theta of i+1 optical fiber grating inclination angle sensor feedbacki+1, wherein, i is integer, and 1≤i ＜ n.Need explanation
, in a particular embodiment, it is also desirable to the signal gathering the 1st optical fiber grating inclination angle sensor obtains the 1st fiber grating
The inclination angle theta of obliquity sensor feedback1.In the present embodiment, can from the bottom of business inclinometer pipe 20 to top to each fiber grating
Obliquity sensor is numbered, on the contrary it is of course also possible to numbering.
Step S200, relative length obtains.Obtain i+1 optical fiber grating inclination angle sensor relative to i-th optical fiber light
The relative length L of pitch of shed sensor.In a preferred embodiment, can relative length between each sensor can be equal,
The most a length of L, the 1st optical fiber grating inclination angle sensor can also be L relative to the length of the bottom of business inclined tube 20.
Step S300, relative horizontal displacement calculates.Inclination angle theta according to i+1 optical fiber grating inclination angle sensor feedbacki+1
I+1 the optical fiber grating inclination angle sensor relative water relative to i-th optical fiber grating inclination angle sensor is obtained with relative length L
Prosposition moves di+1, in a particular embodiment, the height of optical fiber grating inclination angle sensor self can be ignored, and each two is sensed
Between device, the business inclinometer pipe of L length regards rigid body as, thus, it is possible to use equation below to calculate relative horizontal displacement di+1: di+1
=Lsin θi+1.In other embodiments, for the relative horizontal displacement d of the 1st optical fiber grating inclination angle sensor1, it is also possible to adopt
Calculate with above-mentioned formula, specifically, d1=Lsin θ1.Thus, it is possible to successively according to θ1、θ2……θnIt is calculated d1、
d2……dn。
Step S400, horizontal distortion displacement adds up.Cumulative 1st to i+1 optical fiber grating inclination angle sensor relative to
The relative horizontal displacement of previous optical fiber grating inclination angle sensor, obtains i+1 optical fiber grating inclination angle sensor position
Horizontal distortion displacement D relative to distributed deformation measurement apparatus end (i.e. the bottom of business inclinometer pipe 20)i+1, the most permissible
Draw D respectively1, D2……Dn.It should be noted that in the present embodiment, the 1st optical fiber grating inclination angle sensor position phase
Horizontal distortion displacement D for distributed deformation measurement apparatus end (i.e. the bottom of business inclined tube 20)1It is this sensor
Relative horizontal displacement d1。
Distributed deformation measurement apparatus disclosed in the present embodiment, method and fiber-optic grating sensor and structure thereof, due to
Arranging a pair beam of uniform strength in shell on opposite side, the couple positioned opposite on the inner surface of the beam of uniform strength or outer surface has optical fiber
Grating places position, and, a pair beam of uniform strength two ends with weight respectively are fixed, thus when run-off the straight, at this weight
Under effect so that this pair beam of uniform strength deforms upon, the fiber grating placed on position by being placed on fiber grating can be adopted
Collection is to this tilting value, and owing to fiber grating places position at opposite side, so that when deformation, fiber grating places in position one
By normal strain effect, another, by negative strain effect, therefore, it is possible to reduce the temperature error during detection, then, improves
The accuracy of detection of optical fiber grating inclination angle sensor.
In a preferred embodiment, the outer surface at shell arranges multiple guide protrusions, the plurality of guide protrusions respectively with
Multiple target recess match, thus so that optical fiber grating inclination angle sensor can preferably be fitted in target business inclined tube,
And can move according to the target trajectory that multiple target recess are formed.
In a preferred embodiment, offering the fiber through hole running through its upper and lower surface on top board, fiber through hole is with empty
Heart cylinder connects, and offers the bottom through hole running through its upper and lower surface on bottom, and bottom through hole connects with hollow cylinder, thus
Make the fiber grating that is arranged in hollow cylinder can by this fiber through hole or bottom through hole and higher level's fiber grating or
Person subordinate fiber grating concatenates, it is achieved the multiplexing of fiber grating.
For distributed deformation measurement apparatus, owing to having cascaded n optical fiber grating inclination angle sensor, thus so that this point
Cloth deformation measuring device can be seated in longer business inclined tube, to the deformation tilt of each target area in business inclined tube
Detect.
Additionally, after certain survey engineering terminates, even if business inclinometer pipe is because fixing or nothing after embedment measurement object
Method is taken out, and n optical fiber grating inclination angle sensor of cascade then can take out, when reusing, it is only necessary to set from business inclinometer pipe
Put other business inclinometer pipe, then n optical fiber grating inclination angle sensor of cascade is put in inclinometer pipe, thus so that cascade
Sensor can reuse, saved measurement cost.
In a preferred embodiment, the upper surface of top board is provided with bail, the lower surface of bottom is provided with bail, from
And make the optical fiber grating inclination angle sensor of the superior and the subordinate can carry out machinery concatenation by these bails respectively.
The fiber grating principle distributed deformation measurement apparatus that the present embodiment provides, uses optical signal transmission, transmission range
Far, not by nature electromagnetic interference influence, good stability, capacity of resisting disturbance is strong, can long-range real time on-line monitoring, overcome tradition
Electric signal measurement instrument be highly prone to the impact of electromagnetic interference.
The measurement apparatus of the optical fiber grating inclination angle sensor composition that the present embodiment provides, according to optical fiber grating inclination angle sensor
The tilting value θ that measurement obtains is to calculate deformation values, and optical fiber grating inclination angle sensor can demarcate test at labs, to inclination
Value θ realizes accurately measuring, and the bending strain with the existing business inclinometer pipe surface perceived according to fiber grating is derived
Tilting value θ, the technology deriving deformation values again compare, and eliminate the error during derivation tilting value θ, make deformation values measure
Result is more accurate.
The measurement apparatus of the optical fiber grating inclination angle sensor composition that the present embodiment provides, after a certain engineering monitoring terminates,
The optical fiber grating inclination angle sensor coupled together by steel wire rope can take out after promoting from business inclinometer pipe, only need to want at other
The engineering of monitoring imbeds new business inclinometer pipe, the optical fiber grating inclination angle sensor that steel wire rope connects is placed again into new business
In inclinometer pipe, monitoring can be carried on, it is achieved that repeatable utilization, reduce cost.
Obviously, above-described embodiment is only for clearly demonstrating example, and not restriction to embodiment.Right
For those of ordinary skill in the field, can also make on the basis of the above description other multi-form change or
Variation.Here without also cannot all of embodiment be given exhaustive.And the obvious change thus extended out or
Change among still in the protection domain of the invention.
Claims (8)
1. an optical fiber grating inclination angle sensor structure, it is characterised in that including:
Shell (1), described shell (1) is the hollow cylinder that bottom is open；
A pair beam of uniform strength (10), is separately positioned on described shell (1) interior opposite side, the interior table of the pair of beam of uniform strength (10)
Couple positioned opposite on face or outer surface has fiber grating to place position；
Weight (13), is arranged on the bottom of described shell (1), the two ends of described weight (13) respectively with the pair of beam of uniform strength
(10) fixing.
2. optical fiber grating inclination angle sensor structure as claimed in claim 1, it is characterised in that also include: multiple guide protrusions
(2), the plurality of guide protrusions (2) is arranged on the outer surface of described shell (1)；The plurality of guide protrusions (2) is respectively with many
Individual target recess matches.
3. optical fiber grating inclination angle sensor structure as claimed in claim 1 or 2, it is characterised in that also include:
Top board (6), is connected with the top of described shell (1), the top of the pair of beam of uniform strength (10) respectively with described top board
(6) connect；
Offering the top board through hole (7) running through its upper and lower surface on described top board (6), described top board through hole (7) is hollow with described
Fiber through hole (4) connection of cylinder.
4. optical fiber grating inclination angle sensor structure as claimed in claim 3, it is characterised in that the upper surface of described shell (1)
On be provided with bail.
5. optical fiber grating inclination angle sensor structure as claimed in claim 3, it is characterised in that also include:
Bottom (16), is connected with the bottom of described shell (1), to seal described hollow cylinder；
The bottom through hole (17) running through its upper and lower surface, described bottom through hole (17) and described sky is offered on described bottom (16)
Heart cylinder connects.
6. optical fiber grating inclination angle sensor structure as claimed in claim 5, it is characterised in that the lower surface of described bottom (16)
On be provided with bail.
7. an optical fiber grating inclination angle sensor, it is characterised in that including:
Optical fiber grating inclination angle sensor structure as described in claim 1-6 any one；
A pair fiber grating, the fiber grating being separately positioned on the pair of beam of uniform strength (10) places position.
8. a distributed deformation measurement apparatus, it is characterised in that including:
N optical fiber grating inclination angle sensor as claimed in claim 7 of cascade, described n is the integer more than or equal to 2；This
The bottom of the shell (1) of level sensor is connected to the top of the shell (1) of subordinate's sensor by rope；
The tail optical fiber of each fiber grating is serially connected with same optical fiber；
Business inclinometer pipe (20), for hollow structure, inside has for guiding n described optical fiber grating inclination angle sensor
Groove, for carrying n described optical fiber grating inclination angle sensor of described cascade.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620639760.1U CN205691078U (en) | 2016-06-23 | 2016-06-23 | Distributed deformation measurement apparatus and optical fiber grating inclination angle sensor, structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620639760.1U CN205691078U (en) | 2016-06-23 | 2016-06-23 | Distributed deformation measurement apparatus and optical fiber grating inclination angle sensor, structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205691078U true CN205691078U (en) | 2016-11-16 |
Family
ID=57425812
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620639760.1U Expired - Fee Related CN205691078U (en) | 2016-06-23 | 2016-06-23 | Distributed deformation measurement apparatus and optical fiber grating inclination angle sensor, structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205691078U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105953751A (en) * | 2016-06-23 | 2016-09-21 | 武汉科技大学 | Distributed deformation measurement apparatus and method, fiber grating inclination angle sensor, and fiber grating inclination angle sensor structure |
-
2016
- 2016-06-23 CN CN201620639760.1U patent/CN205691078U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105953751A (en) * | 2016-06-23 | 2016-09-21 | 武汉科技大学 | Distributed deformation measurement apparatus and method, fiber grating inclination angle sensor, and fiber grating inclination angle sensor structure |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105953751A (en) | Distributed deformation measurement apparatus and method, fiber grating inclination angle sensor, and fiber grating inclination angle sensor structure | |
| CN108180841B (en) | A kind of landslide internal displacement monitoring method based on fiber grating | |
| CN101936795B (en) | High-precision cable tension force test method based on model analysis | |
| CN107121158B (en) | A kind of internal enclosed cantilever beam fiber-optic grating sensor | |
| CN106705877A (en) | High-sensitivity fiber Bragg grating strain sensor based on flexible hinges | |
| CN107131836A (en) | It is a kind of while landslide monitoring sensor and its application of the inside and outside displacement field of measurement | |
| CN105973521B (en) | Three-dimensional pressure sensor | |
| CN104279986B (en) | Piston type hydrargyrum optical fiber Bragg grating tilt angle sensor and using method thereof | |
| CN108020167A (en) | A kind of stationary slope level device based on fiber grating | |
| CN109945806B (en) | Two-dimensional fiber bragg grating inclination sensor | |
| CN209483400U (en) | A kind of intelligent grouting cable anchor | |
| CN105910580A (en) | Distributed fiber Bragg grating inclinometer device and inclination metering method | |
| CN110082023A (en) | A kind of real-time monitoring for cable force device and monitoring method | |
| CN108519065A (en) | Differential optical fiber Bragg grating tilt angle sensor and application method thereof | |
| CN109763850A (en) | A kind of intelligent grouting cable anchor and its detection method | |
| CN205691078U (en) | Distributed deformation measurement apparatus and optical fiber grating inclination angle sensor, structure | |
| CN207215032U (en) | Deeply mixing cement-soil pile monitoring system | |
| CN110186514A (en) | The fiber-optic grating sensor and its measurement method of two dimension inclination and vibration while measurement | |
| CN106338272A (en) | Testing device and testing method for measuring inclination angle of component | |
| CN205748363U (en) | A kind of distributed fiber grating inclination measurement device | |
| CN104501732A (en) | Device and method for hydraulic structure deformation distribution type optical fiber monitoring | |
| CN105115439A (en) | Embedded fiber Bragg grating strain sensor for measuring strain of encapsulation of dry-type air-core reactor and method for using same | |
| CN104501773A (en) | Device and method for monitoring vertical deformation of hydraulic construction | |
| CN207675135U (en) | A kind of stationary slope level device based on fiber grating | |
| CN208251184U (en) | A kind of pattern foundation pit supporting structure model casing with FBG monitoring function |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161116 Termination date: 20170623 |