CN203704885U - Gold-plated tilted fiber Bragg grating-based distortion measuring sensor - Google Patents
Gold-plated tilted fiber Bragg grating-based distortion measuring sensor Download PDFInfo
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- CN203704885U CN203704885U CN201420015959.8U CN201420015959U CN203704885U CN 203704885 U CN203704885 U CN 203704885U CN 201420015959 U CN201420015959 U CN 201420015959U CN 203704885 U CN203704885 U CN 203704885U
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Abstract
A gold-plated tilted fiber Bragg grating-based distortion measuring sensor is characterized in that the gold-plated tilted fiber Bragg grating-based distortion measuring sensor is composed of a broadband light source (1), a polarization controller (2), connection optical fibers (3), a gold-plated tilted fiber Bragg grating (4), a distortion bracket (5) and a spectrograph (6); the broadband light source (1) is connected with the polarization controller (2) through one connection optical fiber (3); the polarization controller (2) is connected with the gold-plated tilted fiber Bragg grating (4) through the one connection optical fiber (3); the left end of the gold-plated tilted fiber Bragg grating (4) is fixed to the distortion bracket (5); the right end of the gold-plated tilted fiber Bragg grating (4) is connected with a rotatable end of the distortion bracket (5); the gold-plated tilted fiber Bragg grating (4) is connected with the spectrograph (6) through the other connection optical fiber (3); the left end and the right end of the distortion bracket (5) apply certain pre-stresses to the gold-plated tilted fiber Bragg grating (4) so as to make the gold-plated tilted fiber Bragg grating (4) keep a straight line state; and the gold-plated tilted fiber Bragg grating (4) is adopted as a sensing probe of distortion measurement. The gold-plated tilted fiber Bragg grating-based distortion measuring sensor is advantageous in simple structure, high sensitivity and large measuring range in distortion measurement, and can be applied to various kinds of practical projects and has good application prospects.
Description
Technical field
The invention provides a kind of distortion measurement sensor based on gold-plated inclined optical fiber grating, belong to sensory field of optic fibre.
Background technology
Inclined optical fiber grating is the special bragg grating of a class, and its grating grid face exists certain slanted angle rather than vertical with fiber axis, and therefore many characteristics that are different from common bragg grating also occur.When the fibre core guided mode of forward-propagating passes through inclined optical fiber grating, due to the existence at inclination angle, a fibre core guided mode part that meets phase-matching condition is coupled in covering goes, and becomes the cladding mode of backward transmission, and a part is still coupled as the bragg wavelength of backward transmission in fibre core.The index modulation of inclined optical fiber grating has asymmetry in cylindrical plane, therefore the different light in electric vector polarization direction is when by fiber grating region, stiffness of coupling between the different light in polarization direction is also different, and inclined optical fiber grating has polarized light dependence.
The application of surface plasma effect in fiber grating also played great facilitation to the development of fiber grating.After gold-plated on the covering of inclined optical fiber grating, the evanescent wave that cladding mode produces can produce surface plasma resonance enhancement effect, the light that polarization state is different is subject to different impacts, and the enhancing of evanscent field has also improved sensitivity and the resolution of fiber-optic grating sensor greatly.
Summary of the invention
The purpose of this utility model is to provide a kind of distortion measurement sensor based on gold-plated inclined optical fiber grating.This device can be converted into transmitted spectrum Strength Changes by distortion angle variable quantity to be measured.There is simple in structure, easy operating, the feature such as range is large, sensitivity is high.
The utility model is achieved through the following technical solutions:
A distortion measurement sensor based on gold-plated inclined optical fiber grating, is characterized in that: be made up of wideband light source (1), Polarization Controller (2), connection optical fiber (3), gold-plated inclined optical fiber grating (4), distortion support (5) and spectrometer (6), wideband light source (1) is connected by being connected optical fiber (3) with Polarization Controller (2), Polarization Controller (2) is connected by being connected optical fiber (3) with gold-plated inclined optical fiber grating (4), gold-plated inclined optical fiber grating (4) left end is fixed on distortion support (5), gold-plated inclined optical fiber grating (4) right-hand member connects the rotatable end of distortion support (5), gold-plated inclined optical fiber grating (4) is connected by being connected optical fiber (3) with spectrometer (6), wherein distortion support (5) two ends, left and right apply certain prestress to gold-plated inclined optical fiber grating (4) and make gold-plated inclined optical fiber grating (4) maintenance linear state, gold-plated inclined optical fiber grating (4) is as the sensing probe of distortion measurement.
Described a kind of distortion measurement sensor based on gold-plated inclined optical fiber grating, is characterized in that: gold-plated inclined optical fiber grating (4) length is 10～20 millimeters, and grid face inclination angle is 6～30 degree.
Described a kind of distortion measurement sensor based on gold-plated inclined optical fiber grating, is characterized in that: the gold-plated film thickness in gold-plated inclined optical fiber grating (4) surface is 50～100 nanometers.
Principle of work of the present utility model is: wideband light source (1) sends light wave, obtain along the linearly polarized light of specific direction polarization by Polarization Controller (2), linearly polarized light enters to inject gold-plated inclined optical fiber grating (4) along connecting optical fiber (3), gold-plated inclined optical fiber grating (4) can be distorted under the control of distortion support (5) right-hand member rotation recking means for cargo, from fiber grating mode coupling theory, polarized light in fibre core is in the time that inclination grid face is coupled into covering, in covering, the state of linearly polarized light can change, the surperficial three-dimensional resonance effects such as grade of Gold plated Layer can strengthen covering evanscent field effect, P state polarized light perpendicular to covering tangent plane easily penetrates Gold plated Layer and becomes radiation mode, the S state polarized light that is parallel to tangent plane direction is more suppressed in covering, thereby the polarization state Strength Changes that P state is different with S state polarized light produces more significantly difference under Gold plated Layer surface plasma resonance effect, the size of distortion angle variable quantity is converted into the size of output polarization intensity variation, finally go out the Output optical power of P state and S state polarized light by spectrometer measurement.First, work as sensing probe, be gold-plated inclined optical fiber grating (4), when not being distorted, suppose that incident polarized light is S state polarized light (electric vector direction is in fibre cladding tangent plane direction), when S state polarized light arrives gold-plated inclined optical fiber grating (4) due to the coupling of grating, segment beam is coupled in covering, according to inclined optical fiber grating coupled characteristic principle, the polarization direction of the polarized light in covering is consistent with the polarization direction of fibre core incident polarized light.Then, in the time that gold-plated inclined optical fiber grating (4) is subject to distortion action, suppose that distortion angle size is for θ, the polarization state of incident light is still constant, but now grating grid face has departed from origin-location θ degree under distortion action, the electric vector direction that is coupled to the polarized light in covering is no longer consistent with the electric vector direction of incident polarized light, but produce equally θ degree angle, take perpendicular to covering tangent plane direction as x axle, set up coordinate system take incident light working direction as z axle, in note covering, polarization light intensity size is E
c, E
ccan be decomposed into E in the x-direction
cxe in the y-direction
cy:
When distortion angle changes, the size of x direction and y direction polarized light component also can change thereupon.E
cxp state polarized light, E
cybe S state polarized light, the function using the difference of P state and S state intensity of polarization light size as distortion angle θ, indicates light intensity magnitude with y, indicates distortion angle size with x, can draw the linear changing relation of 0 degree to 90 degree between the two:
y=22.3032-0.53646x+0.00245x
2
The beneficial effects of the utility model are: this device can be converted into the variation of distortion angle to be measured the variation of output light intensity, conveniently realize distortion measurement by the difference of measuring different polarization light output intensity, avoid the instability that adopts the methods such as wave length shift to bring, that utilizes inclined optical fiber grating can effectively solve the temperature cross-sensitivity in sensing simultaneously, the advantage such as that this sensor also has is highly sensitive, range is large, simple in structure, easy operating.
Accompanying drawing explanation
Fig. 1 is the distortion measurement sensor schematic diagram based on gold-plated inclined optical fiber grating of the present utility model;
Fig. 2 is transmitted light spectrogram of the present utility model;
Fig. 3 is that selected cladding mode resonant wavelength P state of the present utility model and S state intensity of polarization light change spectrogram with distortion angle θ;
Fig. 4 is that P state of the present utility model and S state output polarization light intensity are with distortion angle θ variation relation figure;
Fig. 5 is P-S light intensity difference of the present utility model and distortion angle theta function graph of a relation.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the utility model is further described:
Referring to accompanying drawing 1, a distortion measurement sensor based on gold-plated inclined optical fiber grating, is characterized in that: be made up of wideband light source (1), Polarization Controller (2), connection optical fiber (3), gold-plated inclined optical fiber grating (4), distortion support (5) and spectrometer (6), wideband light source (1) is connected by being connected optical fiber (3) with Polarization Controller (2), Polarization Controller (2) is connected by being connected optical fiber (3) with gold-plated inclined optical fiber grating (4), gold-plated inclined optical fiber grating (4) left end is fixed on distortion support (5), gold-plated inclined optical fiber grating (4) right-hand member connects the rotatable end of distortion support (5), gold-plated inclined optical fiber grating (4) is connected by being connected optical fiber (3) with spectrometer (6), wherein distortion support (5) two ends, left and right apply certain prestress to gold-plated inclined optical fiber grating (4) and make gold-plated inclined optical fiber grating (4) maintenance linear state, gold-plated inclined optical fiber grating (4) is as the sensing probe of distortion measurement.
The wideband light source (1) of selecting in this example is take centre wavelength as 1550nm, bandwidth is the wideband light source of 200nm, connecting optical fiber (3) is that core diameter is 9 microns, cladding diameter is the single-mode fiber of 125 microns, gold-plated inclined optical fiber grating (4) utilizes KrF excimer pulse laser to be made, the method adopting is phase masks, the optical fiber using is that Corning SMF-28 carries the photosensitive single-mode fiber of hydrogen, its length is 10 millimeters, grid face inclination angle is 10 degree, bragg wavelength is 1610 nanometers, the gold-plated film thickness in gold-plated inclined optical fiber grating (4) surface is 50 nanometers, adopt sputtering technology method to make gold be deposited upon inclined optical fiber grating surface, Fig. 2 has provided the transmitted light spectrogram of gold-plated inclined optical fiber grating under different distortion angles in this sensor, choose a certain scope cladding mode as measuring object, P state in cladding mode resonant peak and S state polarized component change gradually under distortion action, as shown in Figure 3, Fig. 4 has provided P state and S state output polarization light intensity with distortion angle θ variation relation, the two intensity is done to difference and can be drawn the funtcional relationship of P-S light intensity difference and distortion angle θ in Fig. 5.
Claims (3)
1. the distortion measurement sensor based on gold-plated inclined optical fiber grating, is characterized in that: be made up of wideband light source (1), Polarization Controller (2), connection optical fiber (3), gold-plated inclined optical fiber grating (4), distortion support (5) and spectrometer (6), wideband light source (1) is connected by being connected optical fiber (3) with Polarization Controller (2), Polarization Controller (2) is connected by being connected optical fiber (3) with gold-plated inclined optical fiber grating (4), gold-plated inclined optical fiber grating (4) left end is fixed on distortion support (5), gold-plated inclined optical fiber grating (4) right-hand member connects the rotatable end of distortion support (5), gold-plated inclined optical fiber grating (4) is connected by being connected optical fiber (3) with spectrometer (6), wherein distortion support (5) two ends, left and right apply certain prestress to gold-plated inclined optical fiber grating (4) and make gold-plated inclined optical fiber grating (4) maintenance linear state, gold-plated inclined optical fiber grating (4) is as the sensing probe of distortion measurement.
2. a kind of distortion measurement sensor based on gold-plated inclined optical fiber grating according to claim 1, is characterized in that: gold-plated inclined optical fiber grating (4) length is 10～20 millimeters, and grid face inclination angle is 6～30 degree.
3. a kind of distortion measurement sensor based on gold-plated inclined optical fiber grating according to claim 1, is characterized in that: the gold-plated film thickness in gold-plated inclined optical fiber grating (4) surface is 50～100 nanometers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420015959.8U CN203704885U (en) | 2014-01-07 | 2014-01-07 | Gold-plated tilted fiber Bragg grating-based distortion measuring sensor |
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| CN201420015959.8U CN203704885U (en) | 2014-01-07 | 2014-01-07 | Gold-plated tilted fiber Bragg grating-based distortion measuring sensor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104280588A (en) * | 2014-09-28 | 2015-01-14 | 暨南大学 | Voltage sensing instrument based on liquid-crystal-filled tilted fiber grating and manufacturing method of voltage sensing instrument |
| CN104764418A (en) * | 2014-01-07 | 2015-07-08 | 中国计量学院 | Gold-plated tilted fiber Bragg grating based distortion measuring sensor |
-
2014
- 2014-01-07 CN CN201420015959.8U patent/CN203704885U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104764418A (en) * | 2014-01-07 | 2015-07-08 | 中国计量学院 | Gold-plated tilted fiber Bragg grating based distortion measuring sensor |
| CN104764418B (en) * | 2014-01-07 | 2017-09-26 | 中国计量学院 | A kind of distortion measurement sensor based on gold-plated inclined optical fiber grating |
| CN104280588A (en) * | 2014-09-28 | 2015-01-14 | 暨南大学 | Voltage sensing instrument based on liquid-crystal-filled tilted fiber grating and manufacturing method of voltage sensing instrument |
| CN104280588B (en) * | 2014-09-28 | 2017-05-31 | 暨南大学 | Voltage sensor instrument based on liquid crystal filling inclined optical fiber grating and preparation method thereof |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20140709 Effective date of abandoning: 20170926 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20140709 Effective date of abandoning: 20170926 |