CN103148894A - Angle stress sensor based on optical fiber Bragg gratings - Google Patents
Angle stress sensor based on optical fiber Bragg gratings Download PDFInfo
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- CN103148894A CN103148894A CN2013100442695A CN201310044269A CN103148894A CN 103148894 A CN103148894 A CN 103148894A CN 2013100442695 A CN2013100442695 A CN 2013100442695A CN 201310044269 A CN201310044269 A CN 201310044269A CN 103148894 A CN103148894 A CN 103148894A
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Abstract
The invention discloses an angle stress sensor based on optical fiber Bragg gratings. The angle stress sensor based on the optical fiber Bragg gratings comprises an optical fiber Bragg grating array, a sensing head, a protective tube and a supporting body, wherein the Bragg grating array comprises a plurality of optical fiber Bragg gratings with different wavelengths, the optical fiber Bragg gratings are distributed in a rotational symmetry mode, each optical fiber Bragg grating comprises a grid part and a non-grid part, the sensing head is an elastic body and in a hemispheric shape, the grid parts of the optical fiber Bragg grating array are located inside the sensing head and used for sensing the functions of outside stress, the protective tube is in a tube shape and used for fixing the non-grid parts of the optical fiber Bragg grating array and has the functions of fixation and protection, the supporting body is in a cylindrical shape, the protective tube is located inside the supporting body, one end of the supporting body is connected with the sensing head, and the supporting body is used for supporting the whole sensor. The angle stress sensor based on the optical fiber Bragg gratings has the function of simultaneous measurement of the stress and the angle, and is capable of achieving measurement at all angles (360 DEG C) and being simple in structure.
Description
Technical field
The present invention relates to sensory field of optic fibre, especially for the application of angle and the simultaneously-measured medical science of stress and engineering aspect.
Background technology
Fiber grating is a kind of novel passive photonic device, can be made into various senser elements, is widely used at sensory field.Compare with traditional electric transducer, that fiber-optic grating sensor has is simple in structure, volume is little, the characteristics of lightweight, anticorrosive, anti-electromagnetic interference (EMI), the advantage such as be adapted at working in rugged surroundings, fiber-optic grating sensor is widely used in fields such as civil engineering work, biologic medicals in recent years.
Fiber Bragg Grating FBG has the optical characteristics of narrow-band filtering, and its design feature is to form the index modulation of Sine distribution at the fiber core longitudinal direction.Fiber Bragg Grating FBG can be directly used in the direct measurement of temperature and stress, by the further physical quantitys such as gaging pressure, torsion, vibration, acceleration, bending of different packaged types.The people such as Yu Youlong adopt the corresponding force measurement of the fiber-optic grating sensor of cantilever beam structure to carry out analysis and modification.The people such as Li Fengli adopt double optical fiber grating and cantilever beam structure to eliminate the impact that the variation of ambient temperature counter stress is measured.The people such as Fu Haiwei utilize metallic bellows to encapsulate gaging pressure to fiber grating, corrugated tube has vertically can deformation, the horizontal characteristic of not deformation substantially can be converted into longitudinal strain to ambient pressure, and then in conjunction with the enhanced sensitivity of resilient material realization to fiber bragg grating pressure sensor.In the sensor, the direction of acting force generally there is requirement, in the situation of external influence power orientation or angle the unknown, probably do not reach the measurement purpose of expection.Therefore be necessary to provide azimuth information when measuring stress, but relative less about the simultaneously-measured sensor report of angle and stress.The people such as Yang Shuanshou (publication No.: the inclined to one side long period fiber grating multi-angle of the guarantor strain gauge that CN102322991A) proposes, make long period fiber grating on polarization maintaining optical fibre, because can there be two gratings in birefringence effect, when the effect of stress of extraneous different angles to polarization-maintaining fiber grating, the wavelength variable quantity of two gratings is different, by calculating the information that can obtain stress and angle.But due to the lateral shaft symmetry of polarization maintaining optical fibre, adopt single polarization-maintaining fiber grating when measuring transverse stress, become monotonic nature in 90 degree scopes, so this angle strain gauge is difficult to realize the location of the full angle (360 degree) of counter stress direction.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of angle strain gauge based on Fiber Bragg Grating FBG, has the simultaneously-measured ability of stress intensity and angle, can realize full angle (360 degree) measurement, and simple in structure.
For achieving the above object, the technical solution used in the present invention is as follows:
The invention provides a kind of angle strain gauge based on Fiber Bragg Grating FBG, comprising:
One Fiber Bragg Grating FBG array, this bragg grating array comprise that the fine Bragg grating of a plurality of different wave lengths forms, and become rotational symmetry to distribute, and each this bragg grating comprises grid region part and non-grid region part;
One sensing head, this sensing head are elastic body, become the semi-round ball shape, and the grid region part of Fiber Bragg Grating FBG array is positioned at sensing head inside, has been used for experiencing the effect of extraneous stress;
One protection tube, this protection tube are tubular form, are used for the non-grid region part of fixed fiber bragg grating array, play fixing and protective effect;
One supporter, this supporter are cylindrical shape, and protection tube is positioned at supporter inside, and an end of this supporter is connected with sensing head, and this supporter is used for providing the support of whole sensor.
The invention has the advantages that, measure when realizing stress intensity and angle by four Fiber Bragg Grating FBG networkings, simple in structure, without labyrinth, and with low cost.
Description of drawings
For further illustrating concrete technology contents of the present invention, below in conjunction with example and accompanying drawing, the present invention is done a detailed description, wherein:
Fig. 1 is the schematic diagram of a kind of angle strain gauge based on Fiber Bragg Grating FBG provided by the invention.
Fig. 2 is the cut-open view of a kind of angle strain gauge based on Fiber Bragg Grating FBG provided by the invention.
Embodiment
Please refer to Figure 1 and Figure 2, the invention provides a kind of angle strain gauge based on Fiber Bragg Grating FBG, comprising:
One Fiber Bragg Grating FBG array 1, this bragg grating array is comprised of the fine Bragg grating of four different wave lengths, and becomes rotational symmetry to distribute, and each this bragg grating comprises grid region part 11 and non-grid region part 12.
One sensing head 2, this sensing head 2 is elastic caoutchouc, becomes the semi-round ball shape, the grid region part of Fiber Bragg Grating FBG array 1 is positioned at sensing head 2 inside, has been used for experiencing the effect of extraneous stress.
One protection tube 3, this protection tube 3 is tubular form, this protection tube 3 is glass capillary or capillary tubing, is used for the non-grid region part of fixed fiber bragg grating array, plays fixing and protective effect.
One supporter 4, this supporter 4 is cylindrical shape, can be duroplasts or rigid material, and protection tube 3 is positioned at supporter 4 inside, and this supporter 4 is used for providing the support of whole sensor.
In the present embodiment, Fiber Bragg Grating FBG array 1 is comprised of the Fiber Bragg Grating FBG that 4 wavelength are respectively 1550nm (FBG1), 1551nm (FBG2), 1552nm (FBG3) and 1553nm (FBG4), each grating grid region length is 2mm, and the fiber type that uses is general single mode fiber.Optical fiber optical grating array becomes the rotational symmetry square profile, and the excentric spacing of grating is 0.5mm, specifically arranges as shown in Figure 2.The grid region part 11 of Fiber Bragg Grating FBG array 1 is positioned at the inside of sensing head 2, and non-grid region part 12 is fixed on protection tube 3, protection tube 3 according to same rotational symmetry square profile in supporter 4.This sensing head 2 is elastic caoutchouc, and half bulb diameter is 5mm, and supporter 4 is teflon, and body diameter is 5mm.Because sensing head is elastic caoutchouc, when extraneous effect of stress during in sensing head, sensing head generation elastic deformation, and then cause the drift of the centre wavelength of internal optical fiber bragg grating array 1.4 fine gratings of different wave length are in respectively on X-axis and Y-axis, and the plane is divided into 4 interval I, II, III and IV.When extraneous stress was applied on sensing head along normal direction, according to the difference of stress direction, the wavelength variable quantity of 4 Fiber Bragg Grating FBGs 1 was different.Situation 1: normal force is applied to certain interval, take the I interval as example.When along the I interval method to directive effect in sensing head, the wavelength variations amplitude of FBG1 and FBG2 is greater than FBG3 and FBG4, therefore can be positioned at interval I, and the size of stress can obtain according to the mean value approximate treatment of FBG1 and FBG2 wavelength variable quantity, can obtain according to the ratio calculation of wavelength variable quantity about the angle of stress.So analogize, we can obtain size and the angle of other 3 different normal stresses in interval.Situation 2: normal force is applied to XZ plane or YZ plane, take the XZ plane as example.When the normal orientation along the ZX plane acts on sensing head, the wavelength variations of FBG1 or FBG3 is maximum, the wavelength variable quantity of FBG2 and FBG4 is identical, can determine that according to the grating that maximum wavelength changes stress comes from positive dirction or the opposite direction of X-axis, comes the size of calculated stress according to the maximum wavelength variable quantity.So analogize, we can obtain the size and Orientation of normal stress in other YZ plane.Situation 3: normal force acts on Z axis.At this moment the wavelength variable quantity of four gratings is identical, so direction is unique, and stress intensity can have wavelength variable quantity to calculate.Thus, we can calculate according to the wavelength variations characteristic of 4 Fiber Bragg Grating FBGs stress direction and the size of full angle (360 degree).
Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (5)
1. angle strain gauge based on Fiber Bragg Grating FBG comprises:
One Fiber Bragg Grating FBG array, this bragg grating array comprise that the fine Bragg grating of a plurality of different wave lengths forms, and become rotational symmetry to distribute, and each this bragg grating comprises grid region part and non-grid region part;
One sensing head, this sensing head are elastic body, become the semi-round ball shape, and the grid region part of Fiber Bragg Grating FBG array is positioned at sensing head inside, has been used for experiencing the effect of extraneous stress;
One protection tube, this protection tube are tubular form, are used for the non-grid region part of fixed fiber bragg grating array, play fixing and protective effect;
One supporter, this supporter are cylindrical shape, and protection tube is positioned at supporter inside, and an end of this supporter is connected with sensing head, and this supporter is used for providing the support of whole sensor.
2. the angle strain gauge based on Fiber Bragg Grating FBG according to claim 1, wherein the quantity of Fiber Bragg Grating FBG array is four.
3. the angle strain gauge based on Fiber Bragg Grating FBG according to claim 1, wherein this sensing head is elastic caoutchouc.
4. the angle strain gauge based on Fiber Bragg Grating FBG according to claim 1, wherein protection tube is glass capillary or capillary tubing.
5. the angle strain gauge based on Fiber Bragg Grating FBG according to claim 1, wherein supporter is duroplasts or rigid material.
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Cited By (9)
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| CN105841721A (en) * | 2016-03-21 | 2016-08-10 | 中广核核电运营有限公司 | Fiber Bragg grating force sense sensor, robot and sensing measurement method of robot |
| CN106248269A (en) * | 2016-07-29 | 2016-12-21 | 濮阳光电产业技术研究院 | Temperature-insensitive two-dimensional stress sensor based on fiber grating |
| CN106595531A (en) * | 2016-12-07 | 2017-04-26 | 盐城工学院 | High-precision self-temperature-compensation FBG (fiber bragg grating) rotating angle sensor and method thereof |
| CN107036655A (en) * | 2017-05-04 | 2017-08-11 | 北京航空航天大学 | A kind of monitoring structural health conditions software desk Implementation method based on fibre optical sensor |
| CN108195307A (en) * | 2017-12-27 | 2018-06-22 | 北京信息科技大学 | A kind of polynary bionical feeler of fiber bragg grating array |
| CN111982265A (en) * | 2019-05-21 | 2020-11-24 | 武汉理工大学 | Packaging structure of two-dimensional vibration sensor based on fiber grating |
| CN112902860A (en) * | 2021-01-22 | 2021-06-04 | 重庆大学 | Device based on FBG test rock mass three-dimensional stress |
| CN114154220A (en) * | 2021-12-03 | 2022-03-08 | 山东大学 | Strain change rate damage identification method and system for beam structure |
| CN116067419A (en) * | 2022-05-06 | 2023-05-05 | 西安布拉戈光电科技有限公司 | Finger stall type fiber bragg grating touch sensor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106248269A (en) * | 2016-07-29 | 2016-12-21 | 濮阳光电产业技术研究院 | Temperature-insensitive two-dimensional stress sensor based on fiber grating |
| CN106595531A (en) * | 2016-12-07 | 2017-04-26 | 盐城工学院 | High-precision self-temperature-compensation FBG (fiber bragg grating) rotating angle sensor and method thereof |
| CN107036655A (en) * | 2017-05-04 | 2017-08-11 | 北京航空航天大学 | A kind of monitoring structural health conditions software desk Implementation method based on fibre optical sensor |
| CN108195307A (en) * | 2017-12-27 | 2018-06-22 | 北京信息科技大学 | A kind of polynary bionical feeler of fiber bragg grating array |
| CN111982265A (en) * | 2019-05-21 | 2020-11-24 | 武汉理工大学 | Packaging structure of two-dimensional vibration sensor based on fiber grating |
| CN112902860A (en) * | 2021-01-22 | 2021-06-04 | 重庆大学 | Device based on FBG test rock mass three-dimensional stress |
| CN114154220A (en) * | 2021-12-03 | 2022-03-08 | 山东大学 | Strain change rate damage identification method and system for beam structure |
| CN116067419A (en) * | 2022-05-06 | 2023-05-05 | 西安布拉戈光电科技有限公司 | Finger stall type fiber bragg grating touch sensor |
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Application publication date: 20130612 |