CN104567704A - Tubular strain sensor of optical fiber Bragg grating - Google Patents
Tubular strain sensor of optical fiber Bragg grating Download PDFInfo
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- CN104567704A CN104567704A CN201410718591.6A CN201410718591A CN104567704A CN 104567704 A CN104567704 A CN 104567704A CN 201410718591 A CN201410718591 A CN 201410718591A CN 104567704 A CN104567704 A CN 104567704A
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- optical fiber
- fiber bragg
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- bragg raster
- hole
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Abstract
The invention provides a tubular strain sensor of an optical fiber Bragg grating, which comprises an inner tube, wherein the inner tube comprises a left section, a middle section and a right section; the radial dimension of the middle section is less than that of the left section or the right section; the inner tube is provided with a through hole penetrating through the left section, the middle section and the right section; the optical fiber Bragg grating is arranged in the through hole of the middle section; optical fibers at the two ends of the optical fiber Bragg grating are led out of the through hole of the left section and the through hole of the right section respectively, and connected with optical cables; fixing components used for fixing the optical fiber Bragg grating are arranged in the through hole of the left section and the through hole of the right section; and axial strain induction components and locking components used for fixing the optical cables are arranged at the two ends of the inner tube respectively. The sensor is simple in structure and low in cost; the sensitivity of the sensor can be improved by adjusting a ratio of a distance between flange plates to the length of the middle section; fastening connection of the sensor and the armored optical cables can be conveniently realized by utilizing self-tightening nuts and clamping pieces; a mounting process of the sensor is simplified; and the tensile strength is improved.
Description
Technical field
The present invention relates to optical fiber Bragg raster strain detecting technical field, refer to a kind of optical fiber Bragg raster tubular type strain transducer especially.
Background technology
Existing heavy construction structure, as the heavy constructions such as the friction pile of bridge, dam, tunnel, side slope and retaining wall are vulnerable to the structural damage that rugged surroundings and geological movement change occur.Strain is the important indicator characterizing engineering structure safety, and people strain assessment monitoring target being carried out to health status usually by detection architecture.When building structure be subject to extraneous acting force make it strain excessive time, structure is easy to occur crack, distortion, inclination equivalent damage, serious caused structure breaking or collapse and wait severe safety to construct.Therefore carry out long-term, real-time monitoring to building structure strain to have great importance.
Fiber Bragg Grating Strain Sensor utensil has that anti-electromagnetic interference capability is strong, measurement range is wide, loss is little, precision is high and the feature such as real-time, is particularly suitable for the heavy construction needing real-time strain monitoring, as dam, tunnel, bridge, highway etc.But existing fiber Bragg Grating Strain Sensor device, because of its reasons in structure, exists certain defect, as poor in resistance to tension, sensitivity is low, and this has just buried hidden danger for the monitoring of heavy construction.
Summary of the invention
The present invention proposes a kind of optical fiber Bragg raster tubular type strain transducer, solves the problems such as fiber Bragg Grating Strain Sensor device resistance to tension of the prior art is poor, sensitivity is low.
Technical scheme of the present invention is achieved in that
A kind of optical fiber Bragg raster tubular type strain transducer, comprises interior pipe, and described interior pipe comprises left section, stage casing and right section, and the radial dimension in described stage casing is less than the radial dimension of described left section and right section; Described interior pipe to have described in break-through left section, the through hole of stage casing and right section, and in the through hole of described stage casing part, be provided with optical fiber Bragg raster, the optical fiber at described optical fiber Bragg raster two ends is drawn by the through hole of left section and right section of part and is connected with optical cable respectively; The fixed part for fixing described optical fiber Bragg raster is provided with in the through hole of described left section and right section of part;
The two ends of described interior pipe are respectively equipped with axial strain inductive means and the locking member for fixing described optical cable.
Further, the described fixed part epoxy resin that comprises interior spacing head, outer spacing head and be filled in therebetween; Described interior spacing head and outer spacing head have the aperture holding described optical fiber and pass.
Further, the two ends of described interior pipe are respectively equipped with threaded portion, and described axial strain inductive means is ring flange, and described ring flange screws togather and is fixed on described threaded portion.
Further, described locking member comprises Fastener and nut, and described Fastener is fixed on outer end, described threaded portion, and described nut to be screwed on described threaded portion and to be held therein by described Fastener.
Further, described nut is from jack panel.
Further, described optical cable is armored optical cable.
Further, protective casing is arranged with outside described interior pipe.
Further, described interior pipe is stainless-steel tube.
Beneficial effect of the present invention is:
Optical fiber Bragg raster tubular type strain transducer of the present invention, structure is simple, with low cost; By the adjustment spacing of ring flange and the ratio of middle segment length, transducer sensitivity can be increased; Utilize and can realize being fastenedly connected of sensor and armored optical cable easily from jack panel and Fastener, simplify sensor installation process and improve tensile resistance.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the inner structure schematic diagram of one embodiment of the invention;
Fig. 2 is the external structure schematic diagram of one embodiment of the invention.
In figure:
1, interior pipe; 2, left section; 3, stage casing; 4, right section; 5, through hole; 6, optical fiber Bragg raster; 7, optical fiber; 8, optical cable; 9, fixed part; 10, axial strain inductive means; 11, locking member; 12, threaded portion; 13, Fastener; 14, nut; 15, protective casing; 16, interior spacing head; 17, outer spacing head; 18, epoxy resin; 19, aperture.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
As shown in Figure 1-2, optical fiber Bragg raster tubular type strain transducer in the present embodiment, comprise interior pipe 1, described interior pipe 1 comprises left section 2, stage casing 3 and right section 4, described left section 2, stage casing 3 and right section 4 be all cylindrical, the radial dimension in described stage casing 3 is less than the radial dimension of described left section 2 and right section 4; Described interior pipe 1 to have described in break-through left section 2, the through hole 5 of stage casing 3 and right section 4, in the through hole 5 of described stage casing 3 part, be provided with optical fiber Bragg raster 6, the optical fiber 7 at described optical fiber Bragg raster 6 two ends is drawn by the through hole 5 of left section 2 and right section 4 parts respectively and is connected with optical cable 8; The fixed part 9 for fixing described optical fiber Bragg raster 6 is provided with in the through hole 5 of described left section 2 and right section 4 parts.The two ends of described interior pipe 1 are respectively equipped with axial strain inductive means 10 and the locking member 11 for fixing described optical cable 8.
In the present embodiment, described fixed part 9 comprises interior spacing 16, outer spacing 17 and the epoxy resin 18 that is filled in therebetween; Described interior spacing 16 and outer spacing 17 has the aperture 19 holding described optical fiber 7 and pass.
The two ends of described interior pipe 1 are respectively equipped with threaded portion 12, the radial dimension of described threaded portion 12 is less than the radial dimension of described left section 2 and right section 4, described axial strain inductive means 10 is ring flange, and described ring flange screws togather and is fixed on described threaded portion 12 and is fitted on described left section 2 or right section 4.
Described locking member 11 comprises Fastener 13 and nut 14, and described Fastener 13 is fixed on outer end, described threaded portion 12, and for clamping optical cable 8, described nut 14 to be screwed on described threaded portion 12 and to be held therein by described Fastener 13.
In the present embodiment, described nut 14 is from jack panel; Described optical cable 8 is armored optical cable; Described interior pipe 1 is stainless-steel tube.And protective casing 15 is arranged with outside described interior pipe 1, buffer action is played in radial strain to external world, realizes the protection of internal pipe 1.
The present embodiment utilizes the locking member 11 (comprising nut 14 and Fastener 13) at sensor two ends that armored optical cable is fixed on sensor two ends; Optical fiber Bragg raster 6 is fixed in interior pipe 1 through epoxy resin 18; Both sides ring flange is fixed on interior pipe 1 two ends by screw thread, for detecting extraneous axial strain change; Protective casing 15 is nested in outside interior pipe 1, and buffer action is played in radial strain to external world, realizes the protection of internal pipe 1.
When extraneous axial strain (ε) acts on sensor both sides ring flange, the variable quantity (Δ L) of two ring flange spacing is two ring flange spacing (L
1) with the product of axial strain, that is:
ΔL＝L
1×ε (1)
Ring flange is fixed on interior pipe 1 two ends by screw thread, then the spacing variable quantity of ring flange is identical with the elongation of interior pipe 1, and namely, the elongation of pipe 1 is also Δ L.
Because stage casing 3 caliber of interior pipe 1 is less, cross-sectional area is little; The caliber of left section 2 and right section 4 is comparatively large, and cross-sectional area is large, then deformation mainly occurs in the position, stage casing 3 of interior pipe 1 (length is L
2).Ignore the deformation of both sides compared with pipe 1 in position, extra heavy pipe footpath, then the elongation at position, stage casing 3 is Δ L, that is:
ΔL＝L
2×ε' (2)
Wherein, ε ' is the strain of position, stage casing 3.
Optical fiber Bragg raster 6 is fixed in interior pipe 1 through epoxy resin 18, and control by interior spacing 16 the both sides that bonding location is position, interior pipe 1 stage casing 3, therefore, optical fiber Bragg raster 6 even axial strain occurs and is:
The optical fiber Bragg raster 6 wavelength-shift amount that evenly axial strain causes is:
In formula (4), λ
bfor the centre wavelength of optical fiber Bragg raster 6, Δ λ
bfor wavelength-shift amount, P
e=0.22 is valid elastic-optic constants.
Visible, by adjusting the spacing L of two ring flanges
1the length L in happening part (i.e. stage casing 3) is strained with interior pipe 1
2between ratio, the sensitivity of sensor can be increased in right amount.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. an optical fiber Bragg raster tubular type strain transducer, is characterized in that: comprise interior pipe, and described interior pipe comprises left section, stage casing and right section, and the radial dimension in described stage casing is less than the radial dimension of described left section and right section; Described interior pipe to have described in break-through left section, the through hole of stage casing and right section, and in the through hole of described stage casing part, be provided with optical fiber Bragg raster, the optical fiber at described optical fiber Bragg raster two ends is drawn by the through hole of left section and right section of part and is connected with optical cable respectively; The fixed part for fixing described optical fiber Bragg raster is provided with in the through hole of described left section and right section of part;
The two ends of described interior pipe are respectively equipped with axial strain inductive means and the locking member for fixing described optical cable.
2. a kind of optical fiber Bragg raster tubular type strain transducer as claimed in claim 1, is characterized in that: the epoxy resin that described fixed part comprises interior spacing head, outer spacing head and is filled in therebetween; Described interior spacing head and outer spacing head have the aperture holding described optical fiber and pass.
3. a kind of optical fiber Bragg raster tubular type strain transducer as claimed in claim 1, it is characterized in that: the two ends of described interior pipe are respectively equipped with threaded portion, described axial strain inductive means is ring flange, and described ring flange screws togather and is fixed on described threaded portion.
4. a kind of optical fiber Bragg raster tubular type strain transducer as claimed in claim 3, it is characterized in that: described locking member comprises Fastener and nut, described Fastener is fixed on outer end, described threaded portion, and described nut to be screwed on described threaded portion and to be held therein by described Fastener.
5. a kind of optical fiber Bragg raster tubular type strain transducer as claimed in claim 4, is characterized in that: described nut is from jack panel.
6. a kind of optical fiber Bragg raster tubular type strain transducer as described in claim 1-5 any one, is characterized in that: described optical cable is armored optical cable.
7. a kind of optical fiber Bragg raster tubular type strain transducer as described in claim 1-5 any one, is characterized in that: be arranged with protective casing outside described interior pipe.
8. a kind of optical fiber Bragg raster tubular type strain transducer as described in claim 1-5 any one, is characterized in that: described interior pipe is stainless-steel tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410718591.6A CN104567704A (en) | 2014-12-02 | 2014-12-02 | Tubular strain sensor of optical fiber Bragg grating |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410718591.6A CN104567704A (en) | 2014-12-02 | 2014-12-02 | Tubular strain sensor of optical fiber Bragg grating |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105115439A (en) * | 2015-08-19 | 2015-12-02 | 昆明理工大学 | Embedded fiber Bragg grating strain sensor for measuring strain of encapsulation of dry-type air-core reactor and method for using same |
| CN108253904A (en) * | 2018-01-31 | 2018-07-06 | 北京航天控制仪器研究所 | A kind of sensitizing type fiber-optic grating sensor and strain monitoring system and method |
| CN110645905A (en) * | 2019-11-11 | 2020-01-03 | 武汉理工大学 | Fiber grating strain sensor with adjustable sensitivity and use method thereof |
| CN111337117A (en) * | 2020-04-14 | 2020-06-26 | 青岛海洋科学与技术国家实验室发展中心 | Optical fiber laser hydrophone |
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| FR2823299B1 (en) * | 2001-04-04 | 2003-09-19 | Commissariat Energie Atomique | LONG BASE EXTENSOMETER WITH TENSITIVE OPTICAL FIBER AND BRAGG NETWORK AND METHOD FOR MANUFACTURING THE EXTENSOMETER |
| CN2643282Y (en) * | 2003-08-12 | 2004-09-22 | 中国科学院力学研究所 | Out led optical fiber strain measuring transducer |
| CN201497490U (en) * | 2009-08-31 | 2010-06-02 | 昆明理工大学 | Optical fiber Bragg grating strain sensor packaged by carbon fiber reinforced composite material |
| CN202133378U (en) * | 2011-05-12 | 2012-02-01 | 北京基康科技有限公司 | Fiber grating strain sensor |
| CN204128511U (en) * | 2014-09-22 | 2015-01-28 | 昆明理工大学 | A kind of optical fiber Bragg raster tubular type strain transducer with self-locking termination |
-
2014
- 2014-12-02 CN CN201410718591.6A patent/CN104567704A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2823299B1 (en) * | 2001-04-04 | 2003-09-19 | Commissariat Energie Atomique | LONG BASE EXTENSOMETER WITH TENSITIVE OPTICAL FIBER AND BRAGG NETWORK AND METHOD FOR MANUFACTURING THE EXTENSOMETER |
| CN2643282Y (en) * | 2003-08-12 | 2004-09-22 | 中国科学院力学研究所 | Out led optical fiber strain measuring transducer |
| CN201497490U (en) * | 2009-08-31 | 2010-06-02 | 昆明理工大学 | Optical fiber Bragg grating strain sensor packaged by carbon fiber reinforced composite material |
| CN202133378U (en) * | 2011-05-12 | 2012-02-01 | 北京基康科技有限公司 | Fiber grating strain sensor |
| CN204128511U (en) * | 2014-09-22 | 2015-01-28 | 昆明理工大学 | A kind of optical fiber Bragg raster tubular type strain transducer with self-locking termination |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105115439A (en) * | 2015-08-19 | 2015-12-02 | 昆明理工大学 | Embedded fiber Bragg grating strain sensor for measuring strain of encapsulation of dry-type air-core reactor and method for using same |
| CN108253904A (en) * | 2018-01-31 | 2018-07-06 | 北京航天控制仪器研究所 | A kind of sensitizing type fiber-optic grating sensor and strain monitoring system and method |
| CN110645905A (en) * | 2019-11-11 | 2020-01-03 | 武汉理工大学 | Fiber grating strain sensor with adjustable sensitivity and use method thereof |
| CN110645905B (en) * | 2019-11-11 | 2021-08-10 | 武汉理工大学 | Fiber grating strain sensor with adjustable sensitivity and use method thereof |
| CN111337117A (en) * | 2020-04-14 | 2020-06-26 | 青岛海洋科学与技术国家实验室发展中心 | Optical fiber laser hydrophone |
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Application publication date: 20150429 |
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