CN206281595U - A kind of sensing device for measuring stress based on cascade-connection long period fiber grating - Google Patents
A kind of sensing device for measuring stress based on cascade-connection long period fiber grating Download PDFInfo
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- CN206281595U CN206281595U CN201621339135.1U CN201621339135U CN206281595U CN 206281595 U CN206281595 U CN 206281595U CN 201621339135 U CN201621339135 U CN 201621339135U CN 206281595 U CN206281595 U CN 206281595U
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Abstract
The utility model discloses a kind of sensing device for measuring stress based on cascade-connection long period fiber grating,It includes ASE light sources,Optical circulator,Cascade-connection long period fiber grating,Fiber Dynamometer and by Fiber Bragg Grating FBG,The first fixed fiber clamp,The stress drive sensing device of moveable second fiber clamp and the composition of the tensiometer on the second fiber clamp,The output end of ASE light sources is connected with a port of optical circulator,Second port of optical circulator is connected with the first end of Fiber Bragg Grating FBG,And second end it is hanging,The first end of the first fiber clamp fiber clamping Bragg grating,Second end of the second fiber clamp fiber clamping Bragg grating,3rd port of optical circulator is connected with the first end of cascade-connection long period fiber grating,Second end of cascade-connection long period fiber grating is connected with Fiber Dynamometer；Advantage is simple structure, low cost, easy to use, is swift in response, and has preferable linear convergent rate, is suitable to dynamic, static measurement.
Description
Technical field
The utility model is related to a kind of stress measurement sensing device, and cascade-connection long period optical fiber light is based on more particularly, to one kind
The sensing device for measuring stress of grid.
Background technology
Fiber grating is a kind of optical passive component of the function admirable for occurring in recent years, and it has, and flexibility is good, precision
High, electromagnetism interference and the good physical such as easy to process.Wherein, Fiber Bragg Grating FBG is extremely quick to temperature and stress
Sense, being capable of the effective physics such as monitoring temperature, stress, deformation by the change of the reflection wavelength of detection fiber Bragg grating
Amount, the sensing characteristicses to Fiber Bragg Grating FBG are conducted extensive research both at home and abroad, the operation principle of Fiber Bragg Grating FBG
It is that under conditions of phase matched is met, generation couples to reach the selection of wavelength between making resonant wavelength pattern；Long period light
The coupling principle of fine grating is the coupling between the cladding mode of fl transmission and fibre core basic mode, make to be shown as in transmission spectrum to have compared with
The absworption peak of big bandwidth；Cascade-connection long period fiber grating is then a kind of using two parameter identical LPFG concatenations
Fiber bragg grating device, when continuous wide band light source is transmitted through first LPFG through fiber core, light
Energy is divided into two parts, and part energy continues to be transmitted along fiber core, and another part energy is then coupled in covering, if
Two LPFG standoff distances are not far, then the optical attenuation in covering is limited, by second long period optical fiber
It is again coupled in fiber core during grating, Mach Zehnder interference is occurred with the light beam of transmission in original fiber core, is made
Cascade-connection long period fiber grating has narrower absworption peak than single LPFG, is greatly improved and uses cascade week long
The measurement sensitivity of the sensing device of phase fiber grating.
Demodulation of Fiber Grating Sensor is also continued to develop, and various sensing and demodulating schemes are proposed in succession.1992-
1994, Melle S M and Davis M A et al. proposed edge filter demodulation demodulation method, and the cardinal principle of edge filter demodulation demodulation is
Respectively have one section of wave band of approximately linear in the absworption peak both sides of the transmission spectrum of LPFG, this wave band transmissivity with
Wavelength has linear approximate relationship, and the reflective light intensity of Fiber Bragg Grating FBG is with centre wavelength after being filtered through LPFG
Relation is changed by filter curve, thus carrys out the reflection wavelength information of detection fiber Bragg grating.Edge filter demodulation demodulation method has
Value is widely applied, the reflection wavelength information for carrying out detection fiber Bragg grating with reference to edge filter demodulation demodulation method can be realized to anti-
Penetrating spectrum carries out wavelength decoding, and the centre wavelength that Fiber Bragg Grating FBG is stressed its reflectance spectrum when straining can occur partially
Move, due to being modulated by cascade-connection long period fiber grating edge, therefore can send out the reflection spectral power of Fiber Bragg Grating FBG
Changing.Therefore how Fiber Bragg Grating FBG linear solution is carried out using cascade-connection long period fiber grating to transfer to realize stress measurement
It is worth research.
The content of the invention
Technical problem to be solved in the utility model be to provide it is a kind of based on cascade-connection long period fiber grating for surveying
The sensing device of stress is measured, its simple structure, low cost are easy to use, are swift in response, with preferable linear convergent rate, be applicable
In dynamic, static measurement.
The utility model solve the technical scheme that is used of above-mentioned technical problem for：One kind is based on cascade-connection long period optical fiber light
The sensing device for measuring stress of grid, it is characterised in that ASE light sources, optical circulator including test, stress drive are passed
Induction device, cascade-connection long period fiber grating and Fiber Dynamometer, described stress drive sensing device by Fiber Bragg Grating FBG,
Fixed first fiber clamp, moveable second fiber clamp and the pulling force being arranged on the second described fiber clamp
Meter composition, the output end of described ASE light sources is connected with a port of described optical circulator, described optical circulator
Second port is connected with the first end of described Fiber Bragg Grating FBG, and the second end of described Fiber Bragg Grating FBG hangs
Sky, the first described fiber clamp clamps the first end of described Fiber Bragg Grating FBG, described the second fiber clamp folder
Handle the second end of described Fiber Bragg Grating FBG, the 3rd port of described optical circulator and described cascade-connection long period
The first end connection of fiber grating, the second end of described cascade-connection long period fiber grating and the input of described Fiber Dynamometer
End connection.
The second described fiber clamp is fixedly connected with for making what the position of the second described fiber clamp was moved
Micrometer caliper.Here, the position of the second fiber clamp can be made to be moved by adjusting micrometer caliper, so as to can gradually increase
Add deduct the stress of small Fiber Bragg Grating FBG.
The position of the reflection peak of described Fiber Bragg Grating FBG just falls in described cascade-connection long period fiber grating
On the edge of the absworption peak of transmission spectrum.It is in order to ensure energy here, providing the restriction requirement of the reflection peak of Fiber Bragg Grating FBG
Enough changes that luminous power is read in Fiber Dynamometer.
The operating environment requirements temperature of described cascade-connection long period fiber grating is constant.Here, limiting cascade-connection long period light
The working environment of fine grating is that the shape of the transmission spectrum in order to ensure cascade-connection long period fiber grating keeps constant, so that can be effective
Improve certainty of measurement.
The sensing device also includes experiment porch, and described cascade-connection long period fiber grating is smooth to be fixed on described experiment
To reduce the error that the factors such as fibre-optical bending, disturbance are brought on platform, described Fiber Dynamometer is smooth to be fixed on described reality
Test on platform, so when measurement is from the luminous power that Fiber Bragg Grating FBG is reflected, touching, rolling in measurement process can be avoided
Dynamic Fiber Dynamometer, to keep, survey data stabilization is reducing error.
Compared with prior art, the utility model has the advantage of：
1）Sensing device of the present utility model using Fiber Bragg Grating FBG to strain sensitiveness, by external tensile force
Effect makes Fiber Bragg Grating FBG that certain strain to occur, so that the centre wavelength of the reflectance spectrum of Fiber Bragg Grating FBG occurs
Displacement, the centre wavelength of the different reflectance spectrum of different size of pulling force correspondence Fiber Bragg Grating FBG, due to by cascade week long
The modulation of phase fiber grating edge filter demodulation, the change of this wavelength causes the power of the reflectance spectrum of Fiber Bragg Grating FBG to become
Change, detected to obtain the information of stress have to the power of the reflectance spectrum of Fiber Bragg Grating FBG using Fiber Dynamometer
Preferable linear convergent rate, it is adaptable to dynamic, static measurement.
2）The simple structure of sensing device of the present utility model, low cost, and the second fiber clamp need to be only moved when using
, it is easy to use；The modulation of edge filter demodulation is carried out using cascade-connection long period fiber grating so that measurement is swift in response.
3）Sensing device of the present utility model need to only use small volume, take due to that need not be detected to wavelength
The measurement of stress sensing is realized by the method for power scale with convenient Fiber Dynamometer, it is to avoid use expensive, volume
Big spectroanalysis instrument so that the sensing device is easier, and brings facility to field operation.
Brief description of the drawings
Fig. 1 is the composition structural representation of sensing device of the present utility model；
Fig. 2 be the Fiber Bragg Grating FBG measured using sensing device of the present utility model reflected optical power and stress it
Between relation schematic diagram.
Specific embodiment
The utility model is described in further detail below in conjunction with accompanying drawing embodiment.
The utility model proposes a kind of sensing device for measuring stress based on cascade-connection long period fiber grating, such as
Shown in Fig. 1, ASE light sources 1, optical circulator 5, stress drive sensing device 4, cascade-connection long period fiber grating that it includes test
3 and Fiber Dynamometer 2, stress drive sensing device 4 is by the Fiber Bragg Grating FBG 42, fixed first that are placed in air
Fiber clamp 41, moveable second fiber clamp 43 and the tensiometer 45 being arranged on the second fiber clamp 43 are constituted, ASE light
The output end in source 1 is connected by optical fiber with a port of optical circulator 5, and second port of optical circulator 5 passes through optical fiber
First end with Fiber Bragg Grating FBG 42 is connected, and the second end of Fiber Bragg Grating FBG 42 is hanging, and the first fiber clamp 41 is pressed from both sides
The first end of Fiber Bragg Grating FBG 42 is handled, the second fiber clamp 43 clamps the second end of Fiber Bragg Grating FBG 42, light
3rd port of circulator 5 is connected by optical fiber with the first end of cascade-connection long period fiber grating 3, cascade-connection long period optical fiber light
Second end of grid 3 is connected by optical fiber with the input of Fiber Dynamometer 2；The light of the output end output of ASE light sources 1 is by the ring of light
Fiber Bragg Grating FBG 42 is transferred to after shape device 5, Fiber Bragg Grating FBG 42 is produced not by adjusting the extraneous stress for applying
With the strain of degree, now the of the light reflected light circulator 5 of the specific wavelength that Fiber Bragg Grating FBG 42 will can be received
Three port transmissions are gone out, and the light for reflecting, can be in optical fiber power by after the edge filter demodulation of cascade-connection long period fiber grating 3
Different performance numbers are read on meter 2 and record.
In the present embodiment, the second fiber clamp 43 is fixedly connected with for moving the position of the second fiber clamp 43
Dynamic micrometer caliper 44, can make the position of the second fiber clamp 43 be moved, so that can by adjusting micrometer caliper 44
Gradually increased or decrease the stress of Fiber Bragg Grating FBG 42.
In the present embodiment, it is desirable to which the position of the reflection peak of Fiber Bragg Grating FBG 42 just falls in cascade-connection long period optical fiber
On the edge of the absworption peak of the transmission spectrum of grating 3, the restriction requirement of the reflection peak of Fiber Bragg Grating FBG 42 is provided, be in order to true
Guarantor can read the change of luminous power in Fiber Dynamometer 2.
In the present embodiment, the operating environment requirements temperature of cascade-connection long period fiber grating 3 is constant, limits cascade-connection long period
The working environment of fiber grating 3 is in order to ensure the shape of the transmission spectrum of cascade-connection long period fiber grating 3 keeps constant, so that can
Effectively improve certainty of measurement.Here, typically can be by the limit temperature of the working environment of cascade-connection long period fiber grating 3 0~50
Between degree Celsius, 26 degrees Celsius are such as limited to.
In the present embodiment, the sensing device also includes experiment porch, and cascade-connection long period fiber grating 3 is smooth to be fixed on reality
Test to reduce the error that the factors such as fibre-optical bending, disturbance are brought on platform, Fiber Dynamometer 2 is smooth to be fixed on experiment porch,
So when measurement is from the luminous power that Fiber Bragg Grating FBG 42 is reflected, can avoid being touched in measurement process, rock optical fiber
Power meter 2, to keep, survey data stabilization is reducing error.
In the present embodiment, it is the ASE light sources of 1525~1605nm that ASE light sources 1 use wave band；Optical circulator 5 is using existing
There is technology；Fiber Bragg Grating FBG 42 uses prior art；First fiber clamp 41 and the second fiber clamp 43 are using existing
Fiber clamp；Tensiometer 45 uses prior art, the size of the stress for reading Fiber Bragg Grating FBG 42；Cascade week long
Phase fiber grating 3 is welded by two existing LPFGs through optical fiber splicer；Fiber Dynamometer 2 is using existing
Technology.
When the reflection wavelength of Fiber Bragg Grating FBG 42 occurs drifting about with STRESS VARIATION, due to by cascade-connection long period light
The modulation of the edge filter demodulation of fine grating 3, the reflected optical power of Fiber Bragg Grating FBG 42 can also change, and this change can be with
Detected by Fiber Dynamometer 2, and then obtained the information of stress to be measured.Fig. 2 is given using sensing of the present utility model
Relation between the reflected optical power and stress of the Fiber Bragg Grating FBG that device is measured（The work of cascade-connection long period fiber grating
The temperature of environment is 26 degrees Celsius）, show there is preferable linear relationship between reflected optical power and stress after linear fit.From
As can be seen that as pulling force increases, reflected optical power increases very fast, linearly dependent coefficient R in Fig. 22It is 0.9924.
The sensitivity of sensing device of the present utility model is 1.074 μ W/N, and the stress range of measurement is 0~0.6N.
Claims (5)
1. a kind of sensing device for measuring stress based on cascade-connection long period fiber grating, it is characterised in that used including test
ASE light sources, optical circulator, stress drive sensing device, cascade-connection long period fiber grating and Fiber Dynamometer, described stress
Sensing device is by Fiber Bragg Grating FBG, fixed first fiber clamp, moveable second fiber clamp and sets for driving
The tensiometer composition being placed on the second described fiber clamp, the output end and described optical circulator of described ASE light sources
A port is connected, and second port of described optical circulator is connected with the first end of described Fiber Bragg Grating FBG,
Second end of described Fiber Bragg Grating FBG is hanging, and the first described fiber clamp clamps described Fiber Bragg Grating FBG
First end, the second described fiber clamp clamps the second end of described Fiber Bragg Grating FBG, described optical circulator
The 3rd port be connected with the first end of described cascade-connection long period fiber grating, described cascade-connection long period fiber grating
Second end is connected with the input of described Fiber Dynamometer.
2. a kind of sensing device for measuring stress based on cascade-connection long period fiber grating according to claim 1,
It is characterized in that the second described fiber clamp is fixedly connected with for making the position of the second described fiber clamp be moved
Micrometer caliper.
3. a kind of sensing for measuring stress based on cascade-connection long period fiber grating according to claim 1 and 2 is filled
Put, it is characterised in that the position of the reflection peak of described Fiber Bragg Grating FBG just falls in described cascade-connection long period optical fiber light
On the edge of the absworption peak of the transmission spectrum of grid.
4. a kind of sensing device for measuring stress based on cascade-connection long period fiber grating according to claim 3,
It is characterized in that the operating environment requirements temperature of described cascade-connection long period fiber grating is constant.
5. a kind of sensing device for measuring stress based on cascade-connection long period fiber grating according to claim 1,
It is characterized in that the sensing device also includes experiment porch, described cascade-connection long period fiber grating is smooth to be fixed on described reality
Test on platform, described Fiber Dynamometer is smooth to be fixed on described experiment porch.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108254018A (en) * | 2017-12-29 | 2018-07-06 | 北京信息科技大学 | The preparation method of stress and temperature biparameter sensor based on LPFG cascades FBG |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108254018A (en) * | 2017-12-29 | 2018-07-06 | 北京信息科技大学 | The preparation method of stress and temperature biparameter sensor based on LPFG cascades FBG |
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