CN105466362B - A kind of torsion sensor based on phase shift optical fiber Bragg grating - Google Patents
A kind of torsion sensor based on phase shift optical fiber Bragg grating Download PDFInfo
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- CN105466362B CN105466362B CN201510873422.4A CN201510873422A CN105466362B CN 105466362 B CN105466362 B CN 105466362B CN 201510873422 A CN201510873422 A CN 201510873422A CN 105466362 B CN105466362 B CN 105466362B
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- optical fiber
- phase shift
- bragg grating
- fiber bragg
- shift optical
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/26—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P13/00—Indicating or recording presence, absence, or direction, of movement
- G01P13/02—Indicating direction only, e.g. by weather vane
Abstract
The invention discloses a kind of torsion sensor based on phase shift optical fiber Bragg grating.Including wideband light source, optical fiber polarizer, optical fiber polarization controller, phase shift optical fiber Bragg grating and spectrometer, wideband light source is sequentially connected optical fiber polarizer, optical fiber polarization controller, phase shift optical fiber Bragg grating and spectrometer by single mode optical fiber；The original state of polarization for being set into the incident light of phase shift optical fiber Bragg grating by adjusting optical fiber polarization controller, sensing coding is used as by the Magnitude Difference at two polarization transmission peaks of the transmission spectrum obtained after phase shift optical fiber Bragg grating is twisted, the windup-degree and torsional direction of object under test are obtained after decoding.The transducer sensitivity is high, small, insensitive to temperature and stress variation, and cost is low, can be used to need the various occasions for measuring windup-degree and direction.
Description
Technical field
The invention belongs to technical field of optical fiber sensing, more particularly, to a kind of based on phase shift optical fiber Bragg grating
Torsion sensor, bidirectional torsion sensing is carried out using phase shift optical fiber Bragg grating, windup-degree and direction can be carried out high
Precision sensing measurement.
Background technology
Since torsion is to reflect the important physical parameter of infrastructure internal degradation situation in intelligence engineering monitoring, reverses and pass
Sensor has attracted the interest of numerous researchers in recent years.Traditional torsion sensor is broadly divided into two categories below：First, based on electricity
The torsion sensor of method, sensors with auxiliary electrode are easily disturbed by electrical noise and temperature；Second, the torsion based on electromagnetic induction phenomenon
Turning sensor, sensors with auxiliary electrode is bulky, and easily by electromagnetic interference.Optic fibre turning sensor, is based particularly on fiber grating
Torsion sensor due to its with it is small, reelability is good, easy to be embedded to, inside configuration, cost are low, precision is high, light-weight etc.
Advantage, is widely used in reversing measurement.At present, optic fibre turning sensor is mainly based upon long-period fiber grating and optical fiber cloth
Glug grating, the former bad mechanical strength, easily influenced by temperature and stress, and there are the of high cost, shortcoming such as sensitivity is low by the latter.Cause
This, there is an urgent need to produce high sensitivity, small, insensitive to temperature and stress variation, cost is low fiber grating at present
Torsion sensor.
The content of the invention
For the disadvantages described above or Improvement requirement of the prior art, the present invention provides one kind to be based on phase shift optical fiber Prague light
The torsion sensor of grid, high sensitivity is small, insensitive to temperature and stress variation, and cost is low, can be used to need to measure
Windup-degree and the various occasions in direction.
To achieve the above object, the present invention provides a kind of torsion sensor, including wideband light source, optical fiber polarizer, light
Fine Polarization Controller, phase shift optical fiber Bragg grating and spectrometer, wideband light source are sequentially connected optical fiber by single mode optical fiber and are polarized
Device, optical fiber polarization controller, phase shift optical fiber Bragg grating and spectrometer；During work, the light that wideband light source is sent passes sequentially through
Optical fiber polarizer, optical fiber polarization controller and phase shift optical fiber Bragg grating, the transmission spectrum of phase shift optical fiber Bragg grating are shown
On spectrometer, the initial polarization that is set into the incident light of phase shift optical fiber Bragg grating by adjusting optical fiber polarization controller
State, is made by the Magnitude Difference at two polarization transmission peaks of the transmission spectrum obtained after phase shift optical fiber Bragg grating is twisted
Encoded for sensing, the windup-degree and torsional direction of object under test are obtained after decoding.
Preferably, by increasing the length or refractive index modulation depth of phase shift optical fiber Bragg grating, phase shift light is improved
The transmission spectrum depth of fine Bragg grating, and then improve the sensitivity of torsion sensor.
Preferably, phase shift optical fiber Bragg grating is multiple that multiple phase shift optical fiber Bragg gratings have different centers
Wavelength, cascade are arranged between optical fiber polarization controller and spectrometer, torsion sensor is realized multimetering at the same time.
In general, by the contemplated above technical scheme of the present invention compared with prior art, have below beneficial to effect
Fruit：
(1) high sensitivity, using the Magnitude Difference at two polarization peaks of phase shift Bragg grating as coding, effectively raises
Sensitivity, compared with existing similar techniques, the sensitivity of sensor of the invention at least improves an order of magnitude.
(2) it is small, grating length is currently based on used by the torsion sensor of fiber grating generally in more than 5mm,
Phase shift optical fiber Bragg grating in the torsion sensor of the present invention can be inscribed to obtain using femtosecond by-line, the length of quadravalence grating
Only 1.7mm, the length of second order grating can be decreased to below 1mm.
(3) insensitive to temperature and stress variation, two polarization peaks due to belonging to different polarization pattern have identical
Temperature and stress response, its amplitude will not be influenced be subject to temperature and stress variation, so that the Torsion sensing utensil of the present invention
There is the advantages of to temperature and insensitive stress variation.
(4) cost is low, and the phase shift optical fiber Bragg grating in torsion sensor of the invention can be by being directly scribed at list
Obtained on mode fiber, with the prior art based on the torsion sensor of polarization maintaining fiber bragg grating compared with, single mode optical fiber cost
It is low, while demodulating equipment only light requirement spectrometer, without using the Polarization Dependent Loss meter that the price is very expensive, and can be used
Power meter is further reduced the cost instead of spectrometer.
Brief description of the drawings
Fig. 1 is the structure diagram of the torsion sensor based on phase shift optical fiber Bragg grating of the embodiment of the present invention；
Fig. 2 (a) is the transmission spectrum of π phase shift optical fibers Bragg grating under twisting；
Fig. 2 (b) is two polarization transmission peaks of the π phase shift optical fibers Bragg grating under different windup-degrees and direction
Magnitude Difference responds.
In all of the figs, identical reference numeral is used for representing identical element or structure, wherein：1- wideband light sources,
2- single mode optical fibers, 3- optical fiber polarizers, 4- optical fiber polarization controllers, 5- optical fiber clamping fixtures, 6- phase shift optical fiber Bragg gratings,
7- optic fibre turning fixtures, 8- spectrometers.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, it is right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in each embodiment of invention described below
Not forming conflict each other can be mutually combined.
As shown in Figure 1, the torsion sensor based on phase shift optical fiber Bragg grating of the embodiment of the present invention includes broadband light
Source 1, optical fiber polarizer 3, optical fiber polarization controller 4, phase shift optical fiber Bragg grating 6 and spectrometer 8.Wideband light source 1 passes through list
Mode fiber 2 is sequentially connected optical fiber polarizer 3, optical fiber polarization controller 4, phase shift optical fiber Bragg grating 6 and spectrometer 8.
The light that wideband light source 1 is sent passes sequentially through optical fiber polarizer 3, optical fiber polarization controller 4, phase shift optical fiber Prague light
Grid 6, the transmission spectrum of phase shift optical fiber Bragg grating 6 are most clearly shown on spectrometer 8.By adjusting optical fiber polarization controller 4
The original state of polarization of the incident light of phase shift optical fiber Bragg grating 6 is set into, due to the birefringence that optical grating construction introduces, phase shift
The transmission spectrum of Fiber Bragg Grating FBG 6 is related to the polarization state of incident light.
Optical fiber holing clip is set on the single mode optical fiber between optical fiber polarization controller 4 and phase shift optical fiber Bragg grating 6
Tool 5, for one end of phase shift optical fiber Bragg grating 6 to be fixed, between phase shift optical fiber Bragg grating 6 and spectrometer 8
Optic fibre turning fixture 7 is set on single mode optical fiber, and for reversing phase shift optical fiber Bragg grating 6, simulation torsion sensor, which perceives, to be treated
Survey the situation that object twists.
When incident light polarization state is 0 ° or 90 °, an only transmission among the transmission spectrum of phase shift optical fiber Bragg grating 6
Peak, applies phase shift optical fiber Bragg grating 6 by optic fibre turning fixture 7 torsion of certain angle, makes the polarization state of incident light
Change therewith, the single transmission peaks in transmission spectrum split into two transmission peaks, by two polarization transmission peaks caused by torsion
Magnitude Difference encoded as sensing, the windup-degree and torsional direction of phase shift optical fiber Bragg grating 6 are obtained after decoding.
It is single in the transmission spectrum of phase shift optical fiber Bragg grating 6 when incident light polarization state is more than 0 ° and less than 90 °
Transmission peaks are split into two polarization transmission peaks.The original state of polarization of incident light is set as example, adjusting optical fiber polarization controller 4
45 °, apply the torsion of different angle forward or backwards to phase shift optical fiber Bragg grating 6 by optic fibre turning fixture 7, make entrance
The polarization state of the incident light of phase shift optical fiber Bragg grating 6 changes therewith, and then causes phase shift optical fiber Bragg grating 6
The amplitude at two polarization transmission peaks in transmission spectrum changes, and torsion sensor is by the width at two polarization transmission peaks after change
Spend difference to encode as sensing, the windup-degree and torsional direction of phase shift optical fiber Bragg grating 6 are obtained after decoding.
Preferably, by increasing the length or its refractive index modulation depth of phase shift optical fiber Bragg grating 6, phase shift is improved
The transmission spectrum depth of Fiber Bragg Grating FBG 6, and then improve the sensitivity of torsion sensor.
Preferably, torsion sensor includes the different phase shift optical fiber Bragg grating of multiple centre wavelengths, this multiple phase shift
Fiber Bragg Grating FBG cascade is arranged between optical fiber polarization controller 4 and spectrometer 8, torsion sensor is realized at the same time more
Point measurement.
The torsion sensor based on phase shift optical fiber Bragg grating of the present invention is carried out with reference to specific embodiment detailed
Describe in detail bright.
The original state of polarization of incident light is 45 °, and the phase shift of phase shift optical fiber Bragg grating 6 is π, the length of 1.7mm, is turned round
Transfer to test fiber lengths are 20cm.Record respectively phase shift optical fiber Bragg grating 6 reverse respectively in the clockwise direction 0 °, 20 °,
Transmission spectrum in the case of 40 °, 60 ° and 80 °, as shown in Fig. 2 (a), can clearly observe the width at two polarization transmission peaks
Degree is related to windup-degree.Fig. 2 (b) be π phase shift optical fibers Bragg grating two under different windup-degrees and direction partially
The Magnitude Difference response for transmission peaks of shaking, it can be seen that the Magnitude Difference at two polarization transmission peaks of phase shift optical fiber Bragg grating 6
It is in SIN function cyclically-varying with torsion angle.140 ° to 240 ° and counterclockwise 100 ° to 210 ° two in the clockwise direction
Section carries out linear fit respectively, and the slope of obtained fitting a straight line is respectively 0.0819 and -0.08778, corresponding sensitive
Degree is up to 963.53dB/ (rad/mm) and -1032.71dB/ (rad/mm) respectively, hence it is evident that higher than the 28dB/ (rad/ of the prior art
mm)。
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, all any modification, equivalent and improvement made within the spirit and principles of the invention etc., should all include
Within protection scope of the present invention.
Claims (3)
1. a kind of torsion sensor based on phase shift optical fiber Bragg grating, it is characterised in that be polarized including wideband light source, optical fiber
Device, optical fiber polarization controller, phase shift optical fiber Bragg grating and spectrometer, the wideband light source are sequentially connected by single mode optical fiber
The optical fiber polarizer, the optical fiber polarization controller, the phase shift optical fiber Bragg grating and the spectrometer；During work,
The light that the wideband light source is sent passes sequentially through the optical fiber polarizer, the optical fiber polarization controller and the phase shift optical fiber cloth
Glug grating, the transmission spectrum of the phase shift optical fiber Bragg grating is shown on the spectrometer, inclined by adjusting the optical fiber
The controller that shakes is set into the original state of polarization of the incident light of the phase shift optical fiber Bragg grating, by by the phase shift optical fiber
The Magnitude Difference at two polarization transmission peaks of the transmission spectrum that Bragg grating obtains after twisting is encoded as sensing, after decoding
Obtain the windup-degree and torsional direction of object under test；
The phase shift optical fiber Bragg grating is inscribed to obtain by femtosecond by-line, or is obtained by being directly scribed on single mode optical fiber
Arrive.
2. torsion sensor as claimed in claim 1, it is characterised in that by increasing the phase shift optical fiber Bragg grating
Length or refractive index modulation depth, improve the transmission spectrum depth of the phase shift optical fiber Bragg grating, and then improve the torsion
Turn the sensitivity of sensor.
3. torsion sensor as claimed in claim 1 or 2, it is characterised in that the phase shift optical fiber Bragg grating to be multiple,
The multiple phase shift optical fiber Bragg grating has different centre wavelength, and cascade is arranged on the optical fiber polarization controller and institute
Between stating spectrometer, the torsion sensor is set to realize multimetering at the same time.
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| CN201510873422.4A CN105466362B (en) | 2015-12-02 | 2015-12-02 | A kind of torsion sensor based on phase shift optical fiber Bragg grating |
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| CN105466362B true CN105466362B (en) | 2018-05-04 |
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| CN112304906B (en) * | 2020-10-23 | 2024-01-23 | 重庆理工大学 | Dual-channel probe type 81-degree inclined fiber bragg grating sensor system and preparation method and application thereof |
| CN113311525A (en) * | 2021-05-17 | 2021-08-27 | 华侨大学 | Phase-shift fiber Bragg grating preparation method based on femtosecond laser direct writing system |
Citations (4)
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|---|---|---|---|---|
| CN102288136A (en) * | 2011-08-08 | 2011-12-21 | 哈尔滨工程大学 | Torsion sensor based on asymmetric double core optical fiber |
| CN103017687A (en) * | 2012-12-06 | 2013-04-03 | 暨南大学 | Orthogonal polarization fiber bragg grating vector torsion sensing device and detection method thereof |
| CN203704884U (en) * | 2014-01-07 | 2014-07-09 | 中国计量学院 | Polarization measurement-based embedded optical fiber torsion sensor |
| CN104764418A (en) * | 2014-01-07 | 2015-07-08 | 中国计量学院 | Gold-plated tilted fiber Bragg grating based distortion measuring sensor |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6707966B1 (en) * | 2000-05-10 | 2004-03-16 | Corning Incorporated | Twisted long-period fiber grating and method for reducing polarization dependent loss and shifting wavelength of a long-perion fiber grating |
| US8335405B2 (en) * | 2008-11-07 | 2012-12-18 | The United States Of America, As Represented By The Secretary Of The Navy | Method and apparatus for measuring fiber twist by polarization tracking |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102288136A (en) * | 2011-08-08 | 2011-12-21 | 哈尔滨工程大学 | Torsion sensor based on asymmetric double core optical fiber |
| CN103017687A (en) * | 2012-12-06 | 2013-04-03 | 暨南大学 | Orthogonal polarization fiber bragg grating vector torsion sensing device and detection method thereof |
| CN203704884U (en) * | 2014-01-07 | 2014-07-09 | 中国计量学院 | Polarization measurement-based embedded optical fiber torsion sensor |
| CN104764418A (en) * | 2014-01-07 | 2015-07-08 | 中国计量学院 | Gold-plated tilted fiber Bragg grating based distortion measuring sensor |
Non-Patent Citations (3)
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| 基于相移光纤光栅的传感特性研究;孙永熙;《中国优秀硕士学位论文全文数据库 信息科技辑》;20141215(第12期);正文第3.4节第2段，图3.5 * |
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| 高双折射光纤光栅扭转传感器的设计;吴飞等;《仪器仪表学报》;20060630;第27卷(第6（增刊）期);第1590-1591页 * |
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