CN103091012A - 360-degree stress monitoring optical fiber grating microbend sensor - Google Patents
360-degree stress monitoring optical fiber grating microbend sensor Download PDFInfo
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- CN103091012A CN103091012A CN2013100047179A CN201310004717A CN103091012A CN 103091012 A CN103091012 A CN 103091012A CN 2013100047179 A CN2013100047179 A CN 2013100047179A CN 201310004717 A CN201310004717 A CN 201310004717A CN 103091012 A CN103091012 A CN 103091012A
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Abstract
The invention discloses a 360-degree stress monitoring optical fiber grating microbend sensor. The 360-degree stress monitoring optical fiber grating microbend sensor comprises a circular cylinder inner shell, a sensing optical fiber grating, an outer shell, a connection piece and a spring, wherein a tooth groove which is perpendicular to an end face is machined on an edge circumference of the circular cylinder inner shell; the sensing optical fiber grating encircles the tooth groove; the outer shell surrounds the inner shell, and saw teeth which are coupled with the tooth groove of the inner shell are machined on the inner side surface of the outer shell; the connection piece is used for connecting the inner shell and the outer shell; and the spring is placed on the connection piece in a sleeved mode. In a natural state, the inner shell and the outer shell are tightly attached to the sensing optical fiber grating, but the sensing optical fiber grating is not enabled to deform. When an outside parameter acts on the outer shell, the sensing optical fiber grating is squeezed and bent, and the function of the outside parameter is learnt by measuring the central wavelength drift distance of the optical fiber grating. When the action of the outside parameter disappears, the outer shell returns under the action of the spring. According to the 360-degree stress monitoring optical fiber grating microbend sensor, 360-degree carved teeth are adopted, and the change of the outside parameter can be measured comprehensively. The sensing sensitivity is improved by adopting the optical fiber grating. Simultaneously, the optical time domain reflection technology can be utilized to conduct positioning testing, the position of a measured parameter is judged, and thereby real-time monitoring is achieved.
Description
Technical field
The present invention relates to the fiber grating sensing technology field, be specifically related to a kind of 360 ° of stress monitoring fiber grating micro bend sensors.
Background technology
Fiber grating micro bend sensor curvedly causes that fiber grating is crooked and causes centre wavelength to drift about to design according to little, its principle is bent by the modulation of tested parameter according to fiber grating to produce the drift of centre wavelength, and the drift value by detection optical fiber raster center wavelength detects tested parameter.When the tested parameter in the external world changes, make the little curved of fiber grating generating period, and degree of crook changes, the centre wavelength of the light signal that at this moment passes through in fiber grating will change, and can detect thus the variation of tested parameter.Fiber grating micro bend sensor except anti-electromagnetic interference (EMI) with general fiber-optic grating sensor, pliability is good, volume is little, the characteristics such as lightweight, for example also has own unique advantage: easily machinery assembling, do not need fiber grating is connected in miscellaneous part, thereby avoided the differential expansion problem; Have higher reliability and security.
Existing fiber grating micro bend sensor structure species is a lot, corrugated, serrate, spirality are arranged, the various ways such as elastic cylinder or cylindrical shape, friendship frame shape, usually zigzag structure adopts more, and the length of microbend fiber grating between castellated plates and the distance between teeth groove are depended in the sensitivity of this kind structure, can pass through appropriate design teeth groove spacing, make the bending of fiber grating reach optimum efficiency, improve sensitivity, but it is very long that the size of castellated plates can not design, and finally limited the sensitivity of this kind structure.Sensor in the said structure kind only can be measured the variation of the extraneous parameters such as the stress, displacement, acceleration of particular orientation mostly, and the effect orientation of the suffered extraneous parameter of a lot of situation lower sensors is indefinite, therefore in the urgent need to a kind of fiber grating micro bend sensor of comprehensive monitoring.
Summary of the invention
The purpose of this invention is to provide a kind of higher sensitivity that has, can 360 ° of fiber grating micro bend sensors that the extraneous parameter of monitoring changes.
A kind of 360 ° of stress monitoring fiber grating micro bend sensors comprise
The right cylinder inner casing, its lateral surface is along the teeth groove that is processed with in week perpendicular to end face;
Fiber grating is surrounded on the teeth groove of right cylinder inner casing;
Shell is surrounded on the right cylinder inner casing, and its medial surface is processed with the sawtooth that is coupled mutually with the inner casing teeth groove;
Web member between inner casing and shell, is used for connecting inner casing and shell;
Spring is mounted on web member;
Under state of nature, inner casing and shell and fiber grating mutually are adjacent to but do not make fiber grating produce shape
Become; When extraneous parameter acted on shell, the shell sawtooth moved to the inner casing teeth groove, and fiber grating is squeezed and produces bending, knew the effect of extraneous parameter by the crooked centre wavelength drift value that produces of measuring optical fiber grating; Extraneous parameter effect disappears, at the effect lower casing return of spring.
Described space width
Wherein, NA is the numerical aperture of fiber grating, and n is the fiber core refractive index of fiber grating, and a is fiber core radius, and M is the assemble mode number, and m is the guided mode ordinal number.
The cross section of described teeth groove is fan-shaped or trapezoidal.
The sawtooth crown polishing of described shell is level and smooth.
Described shell can adopt a circular shell or a plurality of arc shell to be spliced, and has the gap between adjacent arc shell.
Described inner casing and shell adopt material such as the Polyvinylchloride (PVC) with certain toughness, and ABS resin etc. are made.
Technique effect of the present invention is embodied in:
The present invention adopts the variation of the parameters such as the extraneous stress of the real-time monitoring of technique scheme energy, acceleration, displacement, and by 360 ° comprehensive quarter tooth, greatly improve the sensitivity of sensor, can also position measurement by optical time domain reflection technology, judged the orientation that tested parameter produces.
Description of drawings
Below in conjunction with accompanying drawing and concrete enforcement of the present invention, the present invention is described in further detail:
Fig. 1 is one-piece construction figure of the present invention.
Fig. 2 is blast structural drawing of the present invention.
Fig. 3 is right cylinder inner casing structural representation of the present invention.
Fig. 4 is 90 ° of flute profile shell structure schematic diagram of the present invention.
Fig. 5 is side sectional view of the present invention, and wherein, Fig. 5 (a) is close to inner casing outside schematic diagram for fiber grating, and Fig. 5 (b) is close to shell inboard schematic diagram for fiber grating.
Embodiment
Fig. 1-5 are an embodiment of 360 ° of stress monitoring fiber grating micro bend sensors of the present invention.
Referring to Fig. 1 and Fig. 3, the right cylinder inner casing adopts 360 ° to carve tooth, namely is parallel on the direction of bus around a cylindrical week engraving teeth groove 2 at its outer surface.The quantity of teeth groove, the degree of depth and width can suitably be adjusted according to the size of right cylinder inner casing.In order to improve the sensitivity of device, the optimum width of teeth groove can be according to formula
Wherein NA is the numerical aperture of fiber grating, and n is the fiber core refractive index of fiber grating, and a is fiber core radius, and M is the assemble mode number, and m is the guided mode ordinal number; The cross section of teeth groove is trapezoidal; The crown polishing of shell is level and smooth, prevents that shell from causing damage to fiber grating when mobile.In order to be coupled with corresponding with it flute profile shell, be drilled with screw mounting hole 9 at the side surface of inner casing at interval of 90 °, be carved with spring resettlement groove 6 in screw mounting hole.
Referring to Fig. 2 and Fig. 4, four radians of shell employing are that the flute profile housing of 90 ° is spliced, and surperficial being parallel to is carved with the sawtooth corresponding with the inner casing teeth groove 1 on generatrix direction within it.In order to be coupled mutually with inner casing, be drilled with via hole in the central authorities of shell, be carved with 7, four flute profile shells of spring resettlement groove and be coupled mutually by web member and inner casing in via hole, in this example, web member adopts screw 3.Be provided with spring 5 between inner casing and shell, spring 5 integral body structure in the shape of a spiral are placed between the spring resettlement groove 7 of inner casing spring resettlement groove 6 and shell, and cover is put on screw.When extraneous parameter acted on shell, the shell Compress Spring acts on sensor fibre grating 8 made its generation little curved, and spring 5 mainly plays the variation of the extraneous parameter of buffering to the impact of sensor fibre grating 8 and the effect of recovery inside and outside shell relative position.Leave certain gap between shell and shell, when avoiding extraneous parameter compression shell, produce between shell and shell and interfere.
When the parameters such as extraneous stress, displacement, acceleration change, act on shell, by shell compressed sensing fiber grating 8, make the 8 little curved variations of crooked generation of sensor fibre grating, the variation of the centre wavelength by the light signal that transmits in the detection optical fiber grating and then detect the variation of tested parameter because inner casing adopts 360 ° to carve tooth, is symmetrical structure between shell, can 360 ° the variations of the extraneous parameters of monitoring, improved simultaneously sensitivity.Sensor fibre grating 8 can penetrate by the gap between shell and pass, so that the input of probe source, and the monitoring of checkout equipment.Checkout equipment can be spectrometer or light power meter, due to adopt 360 ° comprehensive quarter tooth, can adopt optical time domain reflectometer (OTDR) to position measurement, to determine the effect orientation of extraneous parameter.
Those skilled in the art will readily understand; the above is only preferred embodiment of the present invention; not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (5)
1. 360 ° of stress monitoring fiber grating micro bend sensors, comprise
The right cylinder inner casing, its lateral surface is along the teeth groove that is processed with in week perpendicular to end face;
Fiber grating is surrounded on the teeth groove of right cylinder inner casing;
Shell is surrounded on the right cylinder inner casing, and its medial surface is processed with the sawtooth that is coupled mutually with the inner casing teeth groove;
Web member between inner casing and shell, is used for connecting inner casing and shell;
Spring is mounted on web member;
Under state of nature, inner casing and shell and fiber grating mutually are adjacent to but do not make fiber grating produce deformation; When extraneous parameter acted on shell, the shell sawtooth can move towards the inner casing teeth groove, and fiber grating is squeezed and produces bending, knew the effect of extraneous parameter by the crooked centre wavelength drift value that produces of measuring optical fiber grating; Extraneous parameter effect disappears, at the effect lower casing return of spring.
2. 360 ° of stress monitoring fiber grating micro bend sensors according to claim 1, is characterized in that described space width
Wherein, NA is the numerical aperture of fiber grating, and n is the fiber core refractive index of fiber grating, and a is fiber core radius, and m is the guided mode ordinal number, and M is the assemble mode number.
3. 360 ° of stress monitoring fiber grating micro bend sensors according to claim 1, is characterized in that, the cross section of described teeth groove is trapezoidal or triangle.
4. 360 ° of stress monitoring fiber grating micro bend sensors according to claim 1, is characterized in that, the sawtooth crown polishing of described shell is level and smooth.
5. according to claim 1 to the described 360 ° of stress monitoring fiber grating micro bend sensors of 4 any one claims, it is characterized in that, described shell is spliced by a plurality of arc shells, has the gap between adjacent arc shell.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013100047179A CN103091012A (en) | 2013-01-07 | 2013-01-07 | 360-degree stress monitoring optical fiber grating microbend sensor |
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| CN2013100047179A CN103091012A (en) | 2013-01-07 | 2013-01-07 | 360-degree stress monitoring optical fiber grating microbend sensor |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103673895A (en) * | 2013-11-29 | 2014-03-26 | 华中科技大学 | Fiber Bragg grating micro-displacement sensor and measuring method thereof |
| CN106404242A (en) * | 2016-10-13 | 2017-02-15 | 浙江理工大学 | Slip sensor based on light micro-bend effect |
| CN109141701A (en) * | 2018-09-29 | 2019-01-04 | 余海波 | sensor and wearable device |
| CN109238534A (en) * | 2018-08-15 | 2019-01-18 | 南京邮电大学 | A kind of multi-core optical fiber microbend sensor |
| CN109751019A (en) * | 2017-11-02 | 2019-05-14 | 中国石油天然气股份有限公司 | Adjustable choke, process pipe string and adjusting method |
| CN111707206A (en) * | 2020-06-04 | 2020-09-25 | 哈尔滨工程大学 | Quantum dot optical fiber micro-bending sensor with position detection function |
| CN112082733A (en) * | 2020-08-31 | 2020-12-15 | 成都泰瑞通信设备检测有限公司 | Non-pressure optical fiber microbend additional loss testing device, testing system and testing method |
| CN114754911A (en) * | 2022-04-06 | 2022-07-15 | 曹桂忠 | Coal mine tunnel roof stress detector based on fiber grating sensor |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103673895A (en) * | 2013-11-29 | 2014-03-26 | 华中科技大学 | Fiber Bragg grating micro-displacement sensor and measuring method thereof |
| CN103673895B (en) * | 2013-11-29 | 2016-05-11 | 华中科技大学 | Fiber Bragg Grating FBG micro-displacement sensor and measuring method thereof |
| CN106404242A (en) * | 2016-10-13 | 2017-02-15 | 浙江理工大学 | Slip sensor based on light micro-bend effect |
| CN106404242B (en) * | 2016-10-13 | 2022-01-14 | 浙江理工大学 | Smooth sense sensor based on optical fiber micro-bending effect |
| CN109751019A (en) * | 2017-11-02 | 2019-05-14 | 中国石油天然气股份有限公司 | Adjustable choke, process pipe string and adjusting method |
| CN109751019B (en) * | 2017-11-02 | 2023-11-28 | 中国石油天然气股份有限公司 | Adjustable oil nozzle, process pipe column and adjusting method |
| CN109238534A (en) * | 2018-08-15 | 2019-01-18 | 南京邮电大学 | A kind of multi-core optical fiber microbend sensor |
| CN109141701A (en) * | 2018-09-29 | 2019-01-04 | 余海波 | sensor and wearable device |
| CN109141701B (en) * | 2018-09-29 | 2023-11-24 | 余海波 | Sensor and wearable equipment |
| CN111707206A (en) * | 2020-06-04 | 2020-09-25 | 哈尔滨工程大学 | Quantum dot optical fiber micro-bending sensor with position detection function |
| CN112082733A (en) * | 2020-08-31 | 2020-12-15 | 成都泰瑞通信设备检测有限公司 | Non-pressure optical fiber microbend additional loss testing device, testing system and testing method |
| CN114754911A (en) * | 2022-04-06 | 2022-07-15 | 曹桂忠 | Coal mine tunnel roof stress detector based on fiber grating sensor |
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Application publication date: 20130508 |