CN110133324A - A kind of differential optical fiber grating acceleration sensing device - Google Patents
A kind of differential optical fiber grating acceleration sensing device Download PDFInfo
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- CN110133324A CN110133324A CN201910486077.7A CN201910486077A CN110133324A CN 110133324 A CN110133324 A CN 110133324A CN 201910486077 A CN201910486077 A CN 201910486077A CN 110133324 A CN110133324 A CN 110133324A
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
- G01H9/004—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
- G01P15/02—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
- G01P15/08—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values
- G01P15/093—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values by photoelectric pick-up
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- Light Guides In General And Applications Therefor (AREA)
Abstract
The invention discloses a kind of differential optical fiber grating acceleration sensing device, including pedestal and shell, the two constitutes the cavity of sealing, further includes having wideband light source, scanning F-P filter, photelectric receiver, demodulator and controller；Column is provided on the pedestal, the top level of column is fixedly installed elastic arm, the free end of elastic arm is fixedly installed mass block, it is additionally provided with fiber grating, diffusing reflection absorber and optical fiber interface, the diffusing reflection absorber is fixed at one end of fiber grating, and the fiber grating other end is fixedly connected with optical fiber interface.The present invention is by rectangle acetal copolymer thin plate as spring beam, setting includes that the fiber grating of three different raster pitch forms differential type acceleration analysis optical path on elastic beam structure certain position, there is good temperature error self compensation, high sensitivity, dynamic response, electromagnetism interference and to the characteristic of local electromagnetic environment non-intruding to treat the measurement that measuring part carries out acceleration, and measure.
Description
Technical field
The present invention relates to motion state detection technical fields more particularly to a kind of differential optical fiber grating acceleration sensing to fill
It sets.
Background technique
Currently, acceleration transducer is a kind of sensor that can measure the parameters such as power relevant to acceleration, displacement.It passes
System acceleration transducer is made of parts such as mass block, damper, elastic element, sensing element and suitable tune circuits, and sensor exists
In accelerator, by the measurement to inertia force suffered by mass block, acceleration value is obtained using Newton's second law.According to sensing
The difference of device sensing element, common acceleration transducer include condenser type, inductance type, strain-type, pressure resistance type, piezoelectric type, with
And the MEMS acceleration transducer etc. based on micro-electromechanical technology in recent years.
There is the shadow being easy by measurement environment external electromagnetic field in use in these above-mentioned acceleration transducers
It rings, interference caused by the crosstalk between signal wire and long signal line resistance, transmitted vibration signal is caused to be distorted or lose
Very.Meanwhile be connected with each other between the out splice going splice of accelerometer, cable connector and cable it is improper can also generate parasitic harmonic wave, fold
It is added in vibration signal, to influence to examine and determine accuracy.In addition, in some fields for needing accurate detection electromagnetic field parameters simultaneously
It closes, to monitoring of high pressure equipment for power transmission and distribution etc., these above-mentioned acceleration transducers use the intrusive mood that will cause to electromagnetic environment
It destroys, the adverse effects such as the decline that causes high voltage equipment insulation performance, so that limiting the use of traditional sensors.
Fiber-optic grating sensor electromagnetism interference, will not generate electromagnetic environment intrusive mood destroy, highly sensitive, small ruler
It is very little, light weight and cost is low, the more general sensor of high temperature, corrosive environment adaptability etc. have apparent advantage, additionally have
Have it is intrinsic from relevant ability it is strong and on an optical fiber using multiplexing technology realize multipoint multiplexing, many reference amounts distributed measurement it is only
Special advantage.
Fiber grating sensing system is mainly made of wideband light source, fiber-optic grating sensor, signal demodulation etc., wideband light source
Light energy is provided for system, fiber-optic grating sensor incudes extraneous measured information using the light wave of light source, and the external world is measured
Information reflected in real time by signal demodulating system.The development trend of fiber grating sensing system is optimization measurement side
Method, the optimization of fiber grating sensing system is mainly from the aspect of three, that is, light source, fiber-optic grating sensor and signal demodulation.
Optimization for sensor-based system, mainly according to the number of sensor, configuration, the sensitivity of sensor and demodulation system
The resolving power of system configures different light sources, sensing arrangement, sensor demodulating system according to actual measurement needs, so that cost
It is low, measurement error is small, measurement accuracy is high.For the requirement of the following fiber grating sensing system networking, answer stability in use it is good,
Broadband, high-output power light source.The direct measurement to physical quantitys such as temperature, strains may be implemented in fiber-optic grating sensor.
Since optic fiber grating wavelength is sensitive simultaneously to temperature and strain, i.e., temperature causes fiber grating to couple simultaneously with strain
Wavelength is mobile, so that can not be distinguish to temperature and strain by measuring the movement of fiber grating coupled wavelength.Therefore, it solves to hand over
The discriminating measurement of fork tender subject, realization temperature and stress is the premise of sensor functionization.It is measured by certain technology
Stress and temperature change are realized to temperature and stress discriminating measurement, or eliminate the shadow of temperature change while measuring stress
Sound is the key that technical solution exploitativeness.So a practical signal demodulation scheme must have high wavelength resolution
Power.Secondly, to solve the test problems of dynamic with stationary singnal, the associativity detection of especially the two has become grating sensing reality
With the difficult point in demodulation techniques.
Summary of the invention
The object of the present invention is to provide a kind of differential optical fiber grating acceleration sensing devices, can be quick with optical grating
Sensing unit with the differential type acceleration sensing device that elastic beam structure constructs, and is measured with temperature error self compensation, sensitivity
It is high, dynamic response is good, electromagnetism interference and to the characteristic of local electromagnetic environment non-intruding.
The technical solution adopted by the present invention are as follows:
A kind of differential optical fiber grating acceleration sensing device, including pedestal and shell, the two constitute the cavity of sealing, also
It include wideband light source, scanning F-P filter, photelectric receiver, demodulator and controller；
Column is provided on the pedestal, the top level of column is fixedly installed elastic arm, the free end of elastic arm
It is fixedly installed mass block, is additionally provided with fiber grating, diffusing reflection absorber and optical fiber interface, the diffusing reflection absorber is fixed
One end of fiber grating is set, and the fiber grating other end is fixedly connected with optical fiber interface；
The optical fiber interface is connected by the left port of conduction optical fiber and coupler, and the right output port of coupler passes through conduction
Grating is connect with wideband light source, and the downlink port of coupler is connect by conduction grating with the input port for scanning F-P filter,
The output beam of scanning F-P filter is irradiated in photelectric receiver, and the output of photelectric receiver and the input terminal of demodulator connect,
The input terminal of the output end connection controller of demodulator, the control signal of the output end connection scanning F-P filter of controller；
The fiber grating is arranged equipped with one end of diffusing reflection absorber in elastic arm upper surface, and the other end successively bypasses
Mass block, the lower end surface of elastic arm, the vertical surface of column and pedestal upper surface connect with optical fiber interface；The optical fiber light
The first grating, the second grating and third grating of different pitches, the fiber grating comprising the first grating are provided on grid
Front section is arranged on the part of elastic arm upper surface, and the optical fiber of the first grating segment length is pasted and is fixed on elastic arm
End face part；Fiber grating middle portion comprising the second grating, which sets up separately, sets on the part of elastic arm lower end surface, and the second grating
The optical fiber of segment length, which is pasted, is fixed at elastic arm lower end surface part, guarantees the first grating and the second grating along elastic arm beam length
Direction position consistency；Fiber grating hindfoot portion comprising third grating is arranged on the part of column side end face；
Part on the fiber grating between the second grating and third grating is provided with buffering ring structure, i.e. this part
Fiber grating voluntarily winding circlewise structure, for preventing when deformation occurs for elastic arm, fiber grating is when swinging up and down
Fiber grating is damaged.
First grating elastic arm corresponding with the second grating is oppositely arranged, consistency from top to bottom, and along elastic arm level side
It is consistent to holding position.
The elastic arm is the isosceles trapezoidal structure of a plate, and the long side of isosceles trapezoidal structure is bottom, bottom and vertical
Column is fixedly connected.
The elastic arm is acetal copolymer.
The mass block is plastics matter gauge block.
It further include having plastics fixed card buckle, for fixing fiber grating to the bottom of column and pedestal.
Pedestal, column and the shell is also made by without metal and magnetic conduction composite material.
It further include the fixed part having for fixing fiber grating double swerve.
The fixed part is the limiting slot in the circumferential direction that opens up on mass block, the width of limiting slot and grating it is straight
Diameter is identical.
Plastics base bottom offers threaded hole, for convenient being connected and fixed with measured body.
The present invention is by the manufacture material using engineering plastics as pedestal and casing, by rectangle acetal copolymer thin plate
As spring beam, the fixed cylindrical inertial mass of the vertical pillars of pedestal, the other end is fixed in one end, constitutes spring beam knot
Structure；Setting includes the fiber grating of three different raster pitch on elastic beam structure certain position；When making measurement, due to inertia matter
The effect of gauge block, acetal copolymer thin plate elastic beam are generated with vibration acceleration and are upwarped and lower bending deformation accordingly, grating 1 by
Grating 2 is compressed while stretching or 2 Tensile of grating while grating 1 is compressed, thus change raster pitch, Jin Ergai
Become reflection peak wavelength and generates corresponding offset Δ λ1With Δ λ2, grating 3 do not stress, i.e. Δ λ3=0；Grating 1 and grating 2
Differential type acceleration analysis optical path is formed, and has the function of temperature self-compensation, the intensity of reflected light of grating 3 is for correcting measurement system
The fixed influence to measurement of flashing of uniting, so as to treat the measurement that measuring part carries out acceleration acceleration, and measures tool
There are good temperature error self compensation, high sensitivity, dynamic response, electromagnetism interference and to the characteristic of local electromagnetic environment non-intruding.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the structural diagram of the present invention；
Fig. 2 is the structural schematic diagram for inventing this elastic arm；
Fig. 3 is the structural schematic diagram for inventing the fiber grating；
Fig. 4 originally states light source, reflection, transmitted light spectrogram for invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under that premise of not paying creative labor
Embodiment shall fall within the protection scope of the present invention.
As shown in Figure 1,2 and 3, the present invention includes pedestal 7 and shell 1, and it further includes having broadband that the two, which constitutes the cavity of sealing,
Light source 10, scanning F-P filter 11, photelectric receiver 12, demodulator 13 and controller 14；
Column is provided on the pedestal 7, the top level of column is fixedly installed elastic arm 2, the freedom of elastic arm 2
End is fixedly installed mass block 4, is additionally provided with fiber grating 3, diffusing reflection absorber 301 and optical fiber interface 6, and the diffusing reflection is inhaled
One end that device 301 is fixed at fiber grating 3 is received, 3 other end of fiber grating is fixedly connected with optical fiber interface 6；
The optical fiber interface 6 is connect by conducting optical fiber 9 with the left port of coupler 8, and the right output port of coupler 8 passes through
Conduction grating 9 is connect with wideband light source 10, and the downlink port of coupler 8 is by conducting grating 9 and scanning the defeated of F-P filter 11
The output beam of inbound port connection, scanning F-P filter 11 is irradiated in photelectric receiver 12, the output and solution of photelectric receiver 12
Adjust the input terminal connection of device 13, the input terminal of the output end connection controller 14 of demodulator 13, the output end connection of controller 14
Scan the control signal of F-P filter 11；
One end setting of the fiber grating 3 equipped with diffusing reflection absorber 301 in 2 upper surface of elastic arm, the other end according to
The secondary upper surface around mass block 4, the lower end surface of elastic arm 2, the vertical surface of column and pedestal 7 is connect with optical fiber interface 6；Institute
The first grating 302, the second grating 303 and third grating 305 of different pitches, the packet are provided on the fiber grating 3 stated
3 front section of fiber grating containing the first grating 302 is arranged on the part of 2 upper surface of elastic arm, and the first grating is 302 sections long
Optical fiber paste and be fixed at 2 upper surface part of elastic arm；3 middle portion of fiber grating comprising the second grating 303, which sets up separately, sets
On the part of 2 lower end surface of elastic arm, and 303 sections of long optical fiber of the second grating are pasted and are fixed at 2 lower end of elastic arm face
Point, guarantee that the first grating and the second grating are consistent along 2 lengthwise location of elastic arm beam；Optical fiber light comprising third grating 305
3 hindfoot portion of grid is arranged on the part of column side end face；
As shown in Fig. 2, diffusing reflection absorber fully absorbs the light after transmiting the first grating 302 to avoid secondary reflection pair again
Measurement has an impact.In actual work, the light beam that wide spectrum light source issues, respectively through third grating 305, the second grating 303, first
Grating 302 successively reflects the light beam of different peak value spectral lines, finally transmits the first grating 302 and enters diffusing reflection absorber 301, light source
Spectrum, reflectance spectrum and transmitted spectrum are shown in Figure 4.
Part on the fiber grating between the second grating 303 and third grating 305 is provided with 304 knot of buffering ring
Structure, the i.e. fiber grating of this part voluntarily winding circlewise structure, for preventing when deformation occurs for elastic arm 2, fiber grating 3
Fiber grating is damaged when swinging up and down；First grating 302 elastic arm 2 corresponding with the second grating 303 is opposite
Setting, consistency from top to bottom, and it is consistent along 2 horizontal direction holding position of elastic arm；
The elastic arm 2 is the isosceles trapezoidal structure of a plate, and the long side of isosceles trapezoidal structure is bottom, bottom and vertical
Column level is fixedly connected.The elastic arm 2 is acetal copolymer elasticity, and the acetal copolymer Celcon M90 is
It can be used for manufacturing the high molecular material of special plastics spring, not only can satisfy the requirement as spring beam, but also can be very
Good avoids metallics bring conductive and magnetic conductivity.
As shown in figure 3, the acetal copolymer elasticity is also possible to special elastic beam, when satisfaction is along beam length direction
Section composite bending modulus W variation it is directly proportional to the variation of moment M, i.e., satisfaction (1) formula condition when, as long as guarantee the first grating with
Temperature self-compensation can be realized in position consistency of second grating in beam length direction, and specifically in spring beam beam length direction what
Position will not have an impact measurement structure.Special elastic girder construction as shown in figure 3, this spring beam along spring beam axis direction
The axial strain of each point is identical, so directed force F can be calculated by (2) formula.
σ is stress in formula, and F is the concentrated force for acting on free end, and L is beam length, b0For the fixing end width of beam, h is beam
It is thick.
Wherein ε is the axial strain of beam, and E is the elastic strain of beam material, and k is known constant after structure determination.
Pedestal, column and the shell is also to be made without metal and magnetic conduction composite material.The mass block is
Plastics matter gauge block.It further include having plastics fixed card buckle, for fixing fiber grating to the bottom of column and pedestal.
It further include the fixed part having for fixing fiber grating double swerve.The fixed part is to open up on mass block
Limiting slot in the circumferential direction, the width of limiting slot and the diameter of grating fibers are identical.Setting fixed part is to prevent double swerve
The decline of bring measurement accuracy namely the spring beam meet the variation of the section composite bending modulus on beam length direction with it is curved
The variation of square is directly proportional, as long as guaranteeing the first grating and the second grating in the position consistency in beam length direction, and specifically in beam length
What position in direction will not have an impact measurement structure.
It heretofore described sensing device all material, device and is connected and fixed technique and is free of metal and magnetic conduction ingredient
Material, acetal copolymer elasticity one end level is adhered to the upper side of plastics base column, the other end is bonded with modeling
Expect that mass block, the fiber grating leading portion include the upper table that the first grating part is adhered to acetal copolymer elasticity in parallel
Face, subsequent fiber grating are turned back after plastics matter gauge block guide groove along acetal copolymer elasticity upper surface is set to acetal
Copolymer elasticity lower surface, middle section include the lower surface, then that the second grating part is adhered to acetal copolymer elasticity in parallel
Optical fiber is after the right angle of acetal copolymer elasticity and plastics base column is coiled into round buffering ring along column and base surface
Optical fiber interface is fixed and imported via plastics fixed card buckle, and plastics base bottom offers threaded hole convenience and measured body
It is connected and fixed, plastic shell protection for device and encapsulation.
The present invention especially selects the conduct of acetal copolymer thin plate using engineering plastics as the manufacture material of pedestal and casing
Spring beam, one end are fixed on the fixed cylindrical inertial mass of the vertical pillars of pedestal, the other end, constitute elastic beam structure；Light
Fine grating includes the grating there are three different raster pitch, and the pitch of each grating is by specific calculations, design；Fiber grating
Front section includes the first grating and stickup solidifies in the upper surface of acetal copolymer thin plate elastic beam, then passes around cylinder
Inertial mass guides fiber grating into acetal copolymer via the fiber grating guide channel on cylindrical inertial mass
The lower surface of thin plate elastic beam will include the fiber grating middle section stickup solidification of the second grating in acetal copolymer thin plate bullet
Property beam lower surface, then fiber grating pitch of the laps forms a round buffering ring, will via fixed card buckle along base mast surface
Fiber grating back segment comprising third grating is fixed on along base mast surface, finally connects the output end of fiber grating with optical fiber
Mouth is connected.
The all parts of sensing device of the present invention use nonmetallic materials to manufacture completely, use optical grating for sensing element
With transmission medium, with the differential type acceleration sensing device that acetal copolymer elastic beam structure constructs, device is missed with temperature
Poor self compensation, high sensitivity, dynamic response be good, electromagnetism interference and to the characteristic of local electromagnetic environment non-intruding, is applied to pair
The monitoring of power, speed, acceleration, vibration etc., particularly suitable for complicated and forceful electric power magnetic environment application.
The reflection peak wavelengths of first grating, the second grating and third grating are different, and diffusing reflection absorber will
Light after transmiting the first grating, which fully absorbs, has an impact measurement to avoid secondary reflection again.
The present invention is realized by the first grating and the second optical grating constitution differential type acceleration analysis sensitivity link to acceleration
The differential measurement of parameter, and have the function of temperature self-compensation；By setting third grating as intensity of light source real-time monitoring, repair
Positive element eliminates the unstable influence of light source luminescent intensity and improves the dynamic response characteristic and measurement accuracy of measuring device.Root
According to the relative acceleration a of inertial massmCalculating or table look-up with the corresponding relationship of tested vibrating body acceleration a can be obtained by vibration measuring
Kinetoplast acceleration.
It is specifically described as follows for the working principle of the invention:
As shown in Figure 1, wideband light source issues the light beam comprising certain spectral component through conduction optical fiber, coupler, conduction light
Fibre imports the optical fiber interface of apparatus of the present invention, and the incident beam is in fiber grating transmission process, by that can produce when third grating
A raw corresponding third screen periods T3Peak wavelength be λ3Reflectance spectrum, via optical fiber interface, conduction optical fiber, coupler, sweep
F-P filter is retouched, is received by photelectric receiver and demodulated device demodulates peak wavelength λ3With peak light intensity I3；By third
The transmitted light beam of grating continues to transmit along fiber grating, by that can generate a corresponding second screen periods T when the second grating2Peak
Value wavelength is λ2Reflectance spectrum, via third grating, optical fiber interface, conduction optical fiber, coupler, scanning F-P filter, by light
Electric receiver receives and demodulated device demodulates peak wavelength λ2With peak light intensity I2；By the second grating transmitted light beam after
It is continuous to be transmitted along fiber grating, by a corresponding first screen periods T can be generated when the first grating1Peak wavelength be λ1Reflection
Spectrum, via the second grating, third grating, optical fiber interface, conduction optical fiber, coupler, scanning F-P filter, by opto-electronic receiver
Device receives and demodulated device demodulates peak wavelength λ1With peak light intensity I1, the transmitted spectrum after the first grating do not wrap
It is λ containing peak wavelength1, peak wavelength λ2, peak wavelength λ3Ingredient, be finally diffusely reflected absorber and fully absorb and nothing
Reflection.Wideband light source spectrum is as shown such as (a) in Fig. 4, in the reflectance spectrum such as Fig. 4 of each grating shown in (b), after the first grating
Transmitted spectrum such as Fig. 4 in shown in (c).
It first has to demarcate system using standard sources before measurement, being marked with quasi-optical source strength is IStandard, when irradiation
The reflection peak light intensity of three gratings is IB, actual measurement correspond to the resulting third grating of real-time light source reflection peak light intensity be
I3, then revised light source intensity is ILight source=I3·IStandard/IB, the unstable influence of light source luminescent intensity, correction value are eliminated with this
The important parameter of scanning F-P filter is controlled as controller, to improve measuring system dynamic response characteristic, improves measurement essence
Degree.
First grating and the second optical grating constitution differential type acceleration analysis sensitivity link are realized to the differential of acceleration
Formula measurement, third grating are eliminated the unstable influence of light source luminescent intensity and are mentioned as intensity of light source real-time monitoring, compensating element
The dynamic response characteristic and measurement accuracy of height measurement device.
According to the relationship of acceleration and strain in optic fiber grating wavelength and strain variation relational expression and elastic system: specific table
It is as follows up to formula:
Wherein λ is optical grating reflection peak wavelength, and Δ λ is peak wavelength shift amount, PeFor the elasto-optical coefficient of optical fiber, ε is light
The strain of grid.
When measurement, due to the effect of inertial mass acceleration, the first grating and the second grating stress and third grating are not
Stress, the first grating and the second grating is stretched or the effect of compression force, temperature change causes raster pitch to become
Change, so that Δ λ occurs for corresponding reflection peak wavelengths1With Δ λ2Offset, has according to (1)~(3) formula
Due to being difference structure, ε can be set1=ε, then ε2=-ε1=-ε；Temperature influences the strain generated due in same
Temperature field, and the first grating and the second grating are adhesively fixed with acetal copolymer spring beam upper and lower surface respectively, so two
The temperature strain of grating is identical, that is, has ε1t=ε2t, then have following formula
It can be obtained after arrangement
(7) formula shows that variate eliminates temperature influence factor.The phase of inertial mass m can be obtained according to mechanics theorem
To acceleration
Finally, according to the relative acceleration a of inertial massmWith the corresponding relationship meter of tested vibrating body absolute acceleration a
That calculates or table look-up obtains tested vibrating body acceleration a.
Preferred embodiments of the invention will be described in detail below；Preferred embodiments be should be appreciated that only for saying
The bright present invention, rather than limiting the scope of protection of the present invention.
The present invention is as described below to carry out structure design in production:
1. determining making material.Spring beam uses acetal copolymer material C elcon M90, and inertial mass uses work
Engineering plastics.
2. determining beam size.Using the structure size for meeting equal strength requirement, design parameter is as shown in table 1.
3. technique for sticking.Solidified using adhering with epoxy resin, concrete model is Lantian LEAFTOP/ -9005.
1 girder construction dimensional parameters of table
| E/GPa | L/mm | b0/m | h/m | m/g |
| 230 | 50 | 15 | 1 | 40 |
Fiber grating design
1. determining making material.Pure silica fibre, optical fiber coating are polymethyl methacrylate (PMMA)
2. determining grating parameter.Fiber grating parameter is as shown in table 2.
3. manufacture craft.It is directed through optical fiber coating (acrylate, polyimides, silica gel, carbon, ceramers)
Carve grid.
2 fiber grating parameter of table
| Pe | λ1/nm | λ2/nm | λ3/nm | FWHM/nm |
| 0.22 | 1500 | 1550 | 1600 | 6 |
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of differential optical fiber grating acceleration sensing device, including pedestal and shell, the two constitutes the cavity of sealing, special
Sign is: further including having wideband light source, scanning F-P filter, photelectric receiver, demodulator and controller；
Column is provided on the pedestal, the top level of column is fixedly installed elastic arm, and the free end of elastic arm is fixed
It is provided with mass block, is additionally provided with fiber grating, diffusing reflection absorber and optical fiber interface, the diffusing reflection absorber fixed setting
In one end of fiber grating, the fiber grating other end is fixedly connected with optical fiber interface；
The optical fiber interface is connected by the left port of conduction optical fiber and coupler, and the right output port of coupler passes through conduction grating
It is connect with wideband light source, the downlink port of coupler is connect by conduction grating with the input port for scanning F-P filter, is scanned
The output beam of F-P filter is irradiated in photelectric receiver, and the output of photelectric receiver and the input terminal of demodulator connect, demodulation
The input terminal of the output end connection controller of device, the control signal of the output end connection scanning F-P filter of controller；
The fiber grating is arranged equipped with one end of diffusing reflection absorber in elastic arm upper surface, and the other end successively bypasses quality
Block, the lower end surface of elastic arm, the vertical surface of column and pedestal upper surface connect with optical fiber interface；On the fiber grating
It is provided with the first grating, the second grating and third grating of different pitches, the fiber grating leading portion comprising the first grating
Part is arranged on the part of elastic arm upper surface, and the optical fiber of the first grating segment length is pasted and is fixed at elastic arm upper surface
Part；Fiber grating middle portion comprising the second grating, which sets up separately, sets on the part of elastic arm lower end surface, and the second grating segment length
Optical fiber paste and be fixed at elastic arm lower end surface part, guarantee the first grating and the second grating along elastic arm beam length direction
Position consistency；Fiber grating hindfoot portion comprising third grating is arranged on the part of column side end face；
Part on the fiber grating between the second grating and third grating is provided with buffering ring structure, the i.e. light of this part
Fine grating voluntarily winding circlewise structure, for preventing when deformation occurs for elastic arm, fiber grating is when swinging up and down to light
Fine grating damages.
2. differential optical fiber grating acceleration sensing device according to claim 1, it is characterised in that: first light
Grid elastic arm corresponding with the second grating is oppositely arranged, consistency from top to bottom, and consistent along elastic arm horizontal direction holding position.
3. differential optical fiber grating acceleration sensing device according to claim 1, it is characterised in that: the elastic arm
Long side for the isosceles trapezoidal structure of a plate, isosceles trapezoidal structure is bottom, and bottom is fixedly connected with column.
4. differential optical fiber grating acceleration sensing device according to claim 1, it is characterised in that: the elastic arm
For acetal copolymer.
5. differential optical fiber grating acceleration sensing device according to claim 1, it is characterised in that: the mass block
For plastics matter gauge block.
6. differential optical fiber grating acceleration sensing device according to claim 1, it is characterised in that: further include having plastics
Fixed card buckle, for fixing fiber grating to the bottom of column and pedestal.
7. differential optical fiber grating acceleration sensing device according to claim 1, it is characterised in that: the pedestal,
Column and shell are also made by without metal and magnetic conduction composite material.
8. differential optical fiber grating acceleration sensing device according to claim 1, it is characterised in that: further include being used for
The fixed part of fixed fiber grating double swerve.
9. differential optical fiber grating acceleration sensing device according to claim 8, it is characterised in that: the fixed part
For the limiting slot in the circumferential direction opened up on mass block, the width of limiting slot and the diameter of grating are identical.
10. differential optical fiber grating acceleration sensing device according to claim 1, it is characterised in that: the plastics machine
Seat bottom offers threaded hole, for convenient being connected and fixed with measured body.
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| CN112683177A (en) * | 2020-12-02 | 2021-04-20 | 浙江煤炭测绘院有限公司 | Tunnel construction lining and ballast bed relative displacement monitoring devices |
| WO2021143742A1 (en) * | 2020-01-13 | 2021-07-22 | 奥动新能源汽车科技有限公司 | Swing sensor |
| CN114061731A (en) * | 2021-09-27 | 2022-02-18 | 北京自动化控制设备研究所 | Non-magnetic interference type optical fiber vector hydrophone |
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