CN104677302A - Three-dimensional sensor based on fiber bragg grating and sensor main body of three-dimensional sensor - Google Patents
Three-dimensional sensor based on fiber bragg grating and sensor main body of three-dimensional sensor Download PDFInfo
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- CN104677302A CN104677302A CN201510130686.0A CN201510130686A CN104677302A CN 104677302 A CN104677302 A CN 104677302A CN 201510130686 A CN201510130686 A CN 201510130686A CN 104677302 A CN104677302 A CN 104677302A
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Abstract
The invention discloses a three-dimensional sensor based on fiber bragg grating and asensor main body of the three-dimensional sensor. The sensor main body is provided with measuring surfaces and positioning parts, wherein the positioning parts are used for positioning and mounting the measuring surfaces on a framework of a measured spatial structure; mounting parts for mounting fiber bragg grating sensors are also arranged on the measuring surfaces; when the measured spatial structure is deformed, the sensor main body is extruded or stretched by the measured spatial structure, and strain parameters of corresponding measuring surfaces can be detected by the fiber bragg grating sensors. By adopting the three-dimensional sensor, the deformation situation of the measured spatial structure in different directions can be handled through the fiber bragg grating sensors mounted on the measuring surfaces of the three-dimensional sensor, and strain parameters in relatively multiple directions of the spatial structure can be handled, so that relevant operators can relatively compressively understand the change of the spatial structure; in addition, by adopting the three-dimensional sensor, the deformation of the spatial structure consisting of only framework beams can be measured according to a fiber bragg grating sensor technique, so that the application range of the fiber bragg grating sensor technique is further widened.
Description
Technical field
The present invention relates to sensing detection technical field, particularly a kind of three-dimension sensor based on fiber grating and sensor main body thereof.
Background technology
Along with building economy high speed development in recent years, various building safety problem gets more and more, and China's construction work causes the economic loss of security incident nearly tens billion of every year because of a variety of causes, solves building safety problem day by day urgent, does not allow to avoid.
Wherein, building safety monitoring system is one of Main Means ensureing Building Construction and use procedure safety.In building safety monitoring system, the collection of monitoring point signal is the key issue of system, therefore, in monitoring system, the investigation and application of sensor is the most crucial technology of system, sensor performance missionary society causes that final monitoring result is inaccurate, assessment and prediction exist comparatively big error, and one dimension sensor can not meet the demand of modern safety monitoring system completely.
In recent years, sensing technology based on fiber grating emerges in an endless stream, substantially show its advantage, therefore fiber-optic grating sensor all obtains a wide range of applications in the fields such as civil engineering, power industry, nuclear industry, aerospace, shipping industry, medical science, petrochemical industry.Optical fiber grating sensing is the change such as light wave intensity, frequency, phase place, polarization state by Optical Fiber Transmission, records the change of wavelength, thus obtains by the size of the physical quantitys such as the stress of geodesic structure, temperature.
In prior art fiber-optic grating sensor substantially can only be used for plane axis to measurement, when space structure Light deformation is measured, need, at different directions, multiple fiber-optic grating sensor is installed, obtain the change of multiple directions, then obtain the deformation in face, all directions place.This detection mode needs the on-the-spot mounting structure arranging multiple installing optical fibres grating in detected space structure, not only destroys detected space structure, and needs in-site installation, wiring, time and effort consuming.
Further, said method is also only be applicable to monoplane distortion measurement, cannot realize the three dimensions deformation monitoring to having joint face, limits the range of application that fiber grating detects.
Therefore, how a kind of three-dimension sensor based on fiber grating is provided, this three-dimension sensor not only has high sensitivity, the measurement to space structure deformation can be realized, improve the deformation parameter measurement accuracy of space structure, and can expand the range of application of fiber grating sensing technology, be those skilled in that art's technical matterss urgently to be resolved hurrily.
Summary of the invention
Object of the present invention is for providing a kind of three-dimension sensor based on fiber grating and sensor main body, this three-dimension sensor can realize the measurement to space structure deformation, highly sensitive, the deformation parameter measurement accuracy of space structure can be improved, and the range of application of fiber grating sensing technology can be expanded.
For solving the problems of the technologies described above, the invention provides a kind of sensor main body of three-dimension sensor, described sensor main body has measured surface and by the location division of described measured surface location and installation on the skeleton of detected space structure, described measured surface is also provided with the installation portion of installing optical fibres grating sensor, when described detected space structural deformation, described detected space structure extruding or the described measured surface that stretches, described fiber-optic grating sensor detects the deformation parameter of corresponding described measured surface.
When using three-dimension sensor provided in this article to measure space structure, the sensor main body being preinstalled with fiber grating packaging arrangement is positioned on the skeleton of detected space structure, then the respective end of fiber grating packaging arrangement is connected external signal receiving equipment, during the generation deformation of detected space structure, detected space structure will extrude or stretch sensor main body, the each fiber grating be then installed on measured surface can detect the strain parameter of measured surface along predetermined direction, and can realize space structure all directions deformation situation by the direction of the shape and fiber-optic grating sensor that rationally arrange measured surface, space structure more direction strain parameter numerical value can be grasped, be conducive to the change that related personnel understands space structure more comprehensively.
It should be noted that, the direction of fiber-optic grating sensor refers to the direction of the optical fiber being carved with grating section.
Further, three-dimension sensor provided in this article can realize using fiber grating sensing technology to the measurement of the space structure deformation only having framework beam to form, and expands the range of application of fiber grating sensing technology further.
Further, three-dimension sensor main body provided in this article has setting otch in a preferred embodiment, can improve transducer sensitivity.Preferably, described installation portion is the groove extended along predetermined direction that described measured surface is arranged, and described fiber-optic grating sensor is fixed in described groove; Described predetermined direction is according to detection direction setting.
Preferably, the bottom land of described groove is provided with otch, and described otch is identical with the bearing of trend of described groove, and described fiber-optic grating sensor is placed in the top of described otch.
Preferably, along corresponding described groove bearing of trend, described otch comprises first paragraph and second segment, and described first paragraph and described second segment are placed in the both ends of described groove respectively, and described first paragraph and second segment are the hatch frame running through described sensor main body, and each section of otch is non-crossing.
Preferably, described three-dimension sensor is for detecting the detected space structure that drift angle is right angle, described sensor main body is the cube structure with the right angle portion Matching installation of described detected space structure, described cube structure wherein three outside surfaces at angle, one end and described detected space structure is fitted and is installed, and three outside surfaces at angle, opposite end are described measured surface; Described groove on three described measured surface is vertical between two.
Preferably, described location division is from the outward extending bending part of the lateral edges of described measured surface, described bending part is provided with threaded hole or through hole, and the threaded portion of bolt connects the skeleton of described detected space structure through described threaded hole or through hole.
Present invention also offers a kind of three-dimension sensor based on fiber grating, comprise the sensor main body described in above-mentioned any one and fiber grating packaging arrangement, described fiber grating packaging arrangement comprises at least three fiber-optic grating sensors, for detecting the deformation of described sensor main body in three-dimensional system of coordinate, each described fiber-optic grating sensor is installed on corresponding described installation portion.
Preferably, described fiber-optic grating sensor is fiber grating patch sensor, and described fiber grating patch sensor is fixed on by welding technology or technique for sticking in the groove of described groove;
Or described fiber-optic grating sensor is naked grating, described naked grating is fixed in the groove of described groove by technique for sticking.
Preferably, each described fiber-optic grating sensor is in sequential series, and one end tail optical fiber connecting fiber grating demodulation equipment of described fiber grating packaging arrangement.
Preferably, also comprise protective cover, described protective cover is buckled in the outside of the measured surface of described sensor main body, and described protective cover is provided with through hole, and one end tail optical fiber of described fiber grating packaging arrangement is through described through hole connecting fiber grating demodulation equipment.
Accompanying drawing explanation
Fig. 1 is the structural representation of sensor main body in an embodiment of the present invention;
Another orientation 3-D view that Fig. 2 is sensor main body shown in Fig. 1;
Fig. 3 is the structural representation of three-dimension sensor in an embodiment of the present invention;
Fig. 4 is the structural representation of three-dimension sensor in the another kind of embodiment of the present invention.
Wherein, the one-to-one relationship in Fig. 1-Fig. 4 between component names and Reference numeral is as follows:
First measured surface 11, otch 11a, the first otch 11a1, the second otch 11a2, the first groove 11b, the second measured surface 12, second groove 12b, otch 12a, the 3rd measured surface 13, the 3rd groove 13b, otch 13a, bending part 14, outside surface 15, fiber-optic grating sensor 20, protective cover 30.
Embodiment
Core of the present invention is for providing a kind of three-dimension sensor based on fiber grating and sensor main body, and this three-dimension sensor can improve the measurement accuracy of space structure, and can improve the range of application of fiber grating detection technique.
In order to make those skilled in the art understand technical scheme of the present invention better, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Please refer to Fig. 1-Fig. 3, Fig. 1 is the structural representation of sensor main body in an embodiment of the present invention; Another orientation 3-D view that Fig. 2 is sensor main body shown in Fig. 1; Fig. 3 is the structural representation of three-dimension sensor in an embodiment of the present invention; The structural representation being provided with a fiber-optic grating sensor is wherein only shown in Fig. 3.
The invention provides a kind of three-dimension sensor based on fiber-optic grating sensor, this three-dimension sensor is mainly for detection of the deformation of space structure, space structure mainly refers to corner-shape structure, such as building structure corner or all kinds of structure with drift angle, space structure can have surface, also can only be made up of framework beam.
Three-dimension sensor provided herein mainly comprises sensor main body and fiber grating packaging arrangement, sensor main body has measured surface and by the location division of measured surface location and installation on the skeleton of detected space structure, it should be noted that, the skeleton of detected space structure described herein both can refer to the surface surrounding detected space structure, also can refer to the framework beam surrounding detected space structure.
Measured surface is also provided with the installation portion of installing optical fibres grating sensor, fiber grating packaging arrangement can comprise at least three fiber grating patch sensors, each fiber grating patch sensor can by respective end connecting fiber grating demodulation equipment, also can be several in sequential series, the interface of external signal receiving equipment can be greatly reduced like this.This fiber grating packaging arrangement can be also naked grating, and naked grating is fixed in the groove of described groove by technique for sticking.
Wherein, the installation direction of the fiber-optic grating sensor that measured surface is installed can set according to the needs of experimental test, usually, the deformation direction on each measured surface synthesized by fiber-optic grating sensor along the change in coordinate axis direction of three-dimensional perpendicular coordinate system, i.e. x direction, y direction, z direction.
When using three-dimension sensor provided in this article to measure space structure, the sensor main body being preinstalled with fiber grating packaging arrangement is positioned on the skeleton of detected space structure, then by the respective end connecting fiber grating demodulation equipment of fiber grating packaging arrangement, when the generation deformation of detected space structure, detected space structure will extrude or stretch sensor main body, the each fiber-optic grating sensor be then installed on measured surface can detect the strain parameter of measured surface along predetermined direction, and the measurement to space structure all directions deformational displacement can be realized by the direction of the shape and fiber-optic grating sensor that rationally arrange measured surface, space structure more direction strain parameter numerical value can be grasped, be conducive to the situation that related personnel understands space structure more comprehensively.
It should be noted that, the direction of fiber-optic grating sensor refers to the direction of the optical fiber being carved with grating section.
And, three-dimension sensor provided in this article can realize using fiber grating sensing technology to the measurement of the space structure deformation only having framework beam to form, expand the range of application of fiber grating sensing technology further, and add the sensitivity to framework beam space-like structure measurement.
For the detected space structure that drift angle is right angle, the sensor main body of three-dimension sensor can be the cube structure with the right angle portion Matching installation of detected space structure, cube structure wherein three outside surfaces at angle, one end and detected space structure is fitted and is installed, three outside surfaces at angle, opposite end are the measured surface of sensor main body, and the groove on three measured surface is vertical between two.Please refer to Fig. 2, Fig. 2 outer surface 15 and detected space structure are fitted and are installed, for convenience of description, three measured surface are defined as the first measured surface 11, second measured surface 12, 3rd measured surface 13, the groove of relative set on the first measured surface 11 is defined as the first groove 11b, groove on second measured surface 12 is defined as the second groove 12b, groove on 3rd measured surface 13 is defined as the 3rd groove 13b, first groove 11b, second groove 12b, 3rd groove 13b is vertical between two, wherein fiber-optic grating sensor is arranged along the direction that groove extends respectively, be arranged at the first groove 11b like this, second groove 12b, fiber-optic grating sensor in 3rd groove 13b detects the deformational displacement of detected space structure in three vertical direction respectively.
First groove 11b, the second groove 12b, the 3rd groove 13b can be arranged at the centre position of corresponding measured surface.
Fiber-optic grating sensor can be fixed in the groove of corresponding recesses by the mode such as welding technology or technique for sticking.
In order to improve the detection sensitivity of three-dimension sensor, can also be further improved the structure of sensor main body.
The bottom land of the groove of the sensor main body measured surface in the respective embodiments described above is provided with otch, and otch is identical with the bearing of trend of groove, and fiber-optic grating sensor is placed in the top of otch.
Along groove bearing of trend, described otch comprises first paragraph and second segment, and described first paragraph and described second segment are placed in the both ends of described groove respectively, and described first paragraph and second segment are the hatch frame running through described sensor main body, and each section of otch is non-crossing.For the first groove 11b on the first measured surface 11, first groove 11b is both ends open structure, the first paragraph of the otch in the first groove 11b and second segment are defined as the first otch 11a1 and the second otch 11a2 respectively, and the first otch 11a1 and the second otch 11a2 can be arranged symmetrically with about the central plane of the first measured surface 11.
Be for entity structure for sensor main body, otch can extend to the installed surface of sensor main body, namely for the sensor main body of entity structure, otch can extend to the laminating installed surface of sensor main body and detected space structure, that is, each face of sensor body structure all has otch.For cube structure, because the first groove 11b, the second groove 12b, the 3rd groove 13b are vertical between two, therefore each otch is also mutually vertical.
In above-described embodiment, the form of otch is conducive to sensor main body stress deformation, increases the detection sensitivity of three-dimension sensor further.
In addition, the serviceable life of three-dimension sensor and its applied environment have and important correlativity, especially for the three-dimension sensor that fiber-optic grating sensor 20 is arranged in sensor main surface, fiber-optic grating sensor 20 is affected by the external environment less, and its sensitivity detected is higher and use serviceable life longer.In order to improve the serviceable life of three-dimension sensor, further improvement being carried out to three-dimension sensor herein, having specifically described as follows.
Please refer to Fig. 4, Fig. 4 is the structural representation of three-dimension sensor in the another kind of embodiment of the present invention.
Three-dimension sensor in the various embodiments described above setting can also also comprise protective cover 30 further; protective cover 30 is buckled in the outside of the measured surface of sensor main body; protective cover 30 is provided with through hole, and one end tail optical fiber of fiber grating packaging arrangement connects outside fiber grating demodulation equipment through through hole.Protective cover 30 can play the effect of isolation sensor main body and external environment; avoid external environment on the impact of the fiber-optic grating sensor 20 that sensor main body is installed; and then the fiber-optic grating sensor 20 of protection setting on sensor main body is from environmental impact, improve the serviceable life of fiber-optic grating sensor 20 and the sensitivity of detection.
Further, the three-dimension sensor structure in above-described embodiment is conducive to the application of three-dimension sensor in relatively rugged surroundings.
Protective cover 30 can be fixed on sensor main body by modes such as bonding, welding, also can be fixedly connected with sensor main body by removablies such as bolts.Certainly, protective cover 30 also can be directly fixed in detected space structure.
Following present the fixed sturcture of sensor main body and detected space structure.
Fig. 1 please be refer again to, the location division of sensor main body can be the outward extending bending part 14 of lateral edges on measurement surface, bending part 14 is provided with threaded hole or through hole 14a, detected space structure relevant position is provided with threaded hole, when sensor main body is fixed, the threaded portion of bolt is connected with the internal thread of the threaded hole of detected space structure through the threaded hole of bending part 14 or through hole 14a, thus realizes fixing of sensor main body and detected space structure.
Only a kind of concrete structure giving sensor main body in a kind of concrete detected space structure herein, the structure of certain sensor main body is not limited to above description, and such as sensor body structure can be hexahedron shell structure or the angled construction etc. be only made up of three measured surface.
In like manner, for the situation of the drift angle on-right angle of detected space Structure composing, can according to the shape of the concrete structure design sensor main body of detected space structure.
Above a kind of three-dimension sensor based on fiber grating provided by the present invention and sensor main body thereof are described in detail.Apply specific case herein to set forth principle of the present invention and embodiment, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improve and modify and also fall in the protection domain of the claims in the present invention.
Claims (10)
1. the sensor main body of a three-dimension sensor, it is characterized in that, described sensor main body has measured surface and by the location division of described measured surface location and installation on the skeleton of detected space structure, described measured surface is also provided with the installation portion of installing optical fibres grating sensor (20), when described detected space structural deformation, described detected space structure extruding or the described measured surface that stretches, described fiber-optic grating sensor (20) detects the deformation parameter of corresponding described measured surface.
2. sensor main body as claimed in claim 1, is characterized in that, described installation portion is the groove extended along predetermined direction that described measured surface is arranged, and described fiber-optic grating sensor is fixed in described groove; Described predetermined direction is according to detection direction setting.
3. sensor main body as claimed in claim 2, it is characterized in that, the bottom land of described groove is provided with otch, and described otch is identical with the bearing of trend of described groove, and described fiber-optic grating sensor (20) is placed in the top of described otch.
4. sensor main body as claimed in claim 3, it is characterized in that, along corresponding described groove bearing of trend, described otch comprises first paragraph and second segment, described first paragraph and described second segment are placed in the both ends of described groove respectively, and described first paragraph and second segment are the hatch frame running through described sensor main body, and each section of otch is non-crossing.
5. the sensor main body as described in any one of claim 2 to 4, it is characterized in that, described three-dimension sensor is for detecting the detected space structure that drift angle is right angle, described sensor main body is the cube structure with the right angle portion Matching installation of described detected space structure, described cube structure wherein three outside surfaces at angle, one end and described detected space structure is fitted and is installed, and three outside surfaces at angle, opposite end are described measured surface; Described groove on three described measured surface is vertical between two.
6. the sensor main body as described in any one of Claims 1-4, it is characterized in that, described location division is from the outward extending bending part of the lateral edges of described measured surface (14), described bending part (14) is provided with threaded hole or through hole (14a), the threaded portion of bolt connects the skeleton of described detected space structure through described threaded hole or through hole (14a).
7. the three-dimension sensor based on fiber grating, it is characterized in that, comprise the sensor main body described in any one of claim 1 to 6 and fiber grating packaging arrangement, described fiber grating packaging arrangement comprises at least three fiber-optic grating sensors, for detecting the deformation of described sensor main body in three-dimensional system of coordinate, each described fiber-optic grating sensor (20) is installed on corresponding described installation portion.
8. three-dimension sensor as claimed in claim 7, it is characterized in that, described fiber-optic grating sensor (20) is fiber grating patch sensor, and described fiber grating patch sensor is fixed on by welding technology or technique for sticking in the groove of described groove;
Or described fiber-optic grating sensor (20) is naked grating, described naked grating is fixed in the groove of described groove by technique for sticking.
9. three-dimension sensor as claimed in claim 7, it is characterized in that, each described fiber-optic grating sensor (20) is in sequential series, and one end tail optical fiber connecting fiber grating demodulation equipment of described fiber grating packaging arrangement.
10. the three-dimension sensor as described in any one of claim 7 to 9; it is characterized in that; also comprise protective cover (30); described protective cover (30) is buckled in the outside of the measured surface of described sensor main body; (30) are provided with through hole with described protective cover, and one end tail optical fiber of described fiber grating packaging arrangement is through described through hole connecting fiber grating demodulation equipment.
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| CN201510130686.0A CN104677302B (en) | 2015-03-24 | 2015-03-24 | A kind of three-dimension sensor and its sensor main body based on fiber grating |
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Cited By (3)
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| CN106767483A (en) * | 2017-01-18 | 2017-05-31 | 山东大学 | Optical fibre grating three-dimensional strain transducer based on elliptical ring |
| CN106932023A (en) * | 2017-04-18 | 2017-07-07 | 中国科学院寒区旱区环境与工程研究所 | Ice body internal stress deformation detecting system and glacier movement assessment system |
| CN111189405A (en) * | 2020-01-13 | 2020-05-22 | 哈尔滨工业大学 | Fiber grating string three-dimensional space strain sensor for road |
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| CN104677302B (en) | 2017-11-24 |
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