CN103308145A - Novel high-sensitivity optical fiber vibrating wire microseismic sensor and manufacturing method - Google Patents
Novel high-sensitivity optical fiber vibrating wire microseismic sensor and manufacturing method Download PDFInfo
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- CN103308145A CN103308145A CN2013101688527A CN201310168852A CN103308145A CN 103308145 A CN103308145 A CN 103308145A CN 2013101688527 A CN2013101688527 A CN 2013101688527A CN 201310168852 A CN201310168852 A CN 201310168852A CN 103308145 A CN103308145 A CN 103308145A
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Abstract
The invention particularly discloses a novel high-sensitivity optical fiber vibrating wire microseismic sensor and a manufacturing method. The sensor comprises a bracket and a fiber Bragg grating (FBG), wherein the bracket is a hollow frame; the FBG penetrates through the hollow position of the hollow frame, and is fixedly arranged on fluted step body structures at the upper and lower ends of the hollow frame; a mass block is arranged on the FBG; the FBG penetrates through the center of mass of the mass block; the mass block is required to be fixedly arranged at the central position of the hollow frame; the gate region of the FBG is arranged between the mass block and the step body structures; and the FBG is connected with a signal processor. The sensor has the advantages of simple, compact and small structure, freedom from electromagnetic interference, high sensitivity, wide band, low cost and the like. A unique pre-tensioning structural design is adopted for the sensor, so that the zero setting and the correction of an FBG seismic sensor can be facilitated.
Description
Technical field
The present invention is specifically related to a kind of novel high sensitivity optical fiber type vibration wire microseismic sensors and method for making.
Background technology
Traditional fiber grating shock sensor is pasted on the grid region on the response bodies such as semi-girder mostly, the vibrations of oscillator make response body produce strain, grating also can be thereupon by tension and compression, this sensor is owing to transmitting vibration signal by response body, sensitivity and response frequency all can decrease, and strain to some extent loss in transmittance process, reduced the authenticity of vibration signal.
A kind of optical fiber raster vibration sensor is disclosed in patent [CN201120494819.X], this sensor sticks on grating on the steel pipe, the vibrations of mass will just can change by steel pipe the strain of grating into, combination of the physical strength of steel pipe, grating and steel pipe etc. all can exert an influence to final demodulation vibration signal out in the process, and this sensor can not well adapt to the microseism measurement, also there is sensitivity not high than this sensor, complex structure, high in cost of production shortcoming.
Summary of the invention
The shortcoming that exists for solving prior art the present invention proposes a kind of novel high sensitivity optical fiber type vibration wire microseismic sensors and method for making.
The technical solution used in the present invention is as follows:
Novel high sensitivity optical fiber type vibration wire microseismic sensors, comprise a support and a fiber grating, described support is one hollow, described fiber grating passes hollow hollow position, and fiber grating is fixed on hollow up and down on the notched trapezium structure in two ends, be provided with mass at described fiber grating, and described fiber grating passes the barycenter of mass, mass is fixed on hollow centre position, the centre position of mass and trapezium structure is located in the grid region of fiber grating, and described fiber grating links to each other with signal processor.
Described support is hollow an of rectangle, is provided with two trapezium structures at hollow upper and lower side, and a groove is carved with in trapezium structure central authorities, and described fiber grating two ends are fixed in the trapezoidal groove.
Described support is hollow an of rectangle, is provided with too two notched trapezium structures at hollow two ends, the left and right sides, and fiber grating is fixed in the trapezoidal groove in the left and right sides.
Described support is hollow an of rectangle, upper end floor beam centre position at hollow is provided with an inverted trapezoidal, there is two-layer crossbeam the lower end, also be provided with a trapezoid in crossbeam centre position, upper strata, there is a groove at two trapezium structure centers, and described fiber grating two ends are fixed in two grooves.
In described hollow the two-layer crossbeam in lower end, lower floor crossbeam center has a screw, and screw passes lower floor's crossbeam, withstands on the crossbeam of upper strata.
Described mass is the regular geometric body, such as cube, rectangular parallelepiped, spheroid or spheroid.
The method for making of described novel high sensitivity optical fiber type vibration wire microseismic sensors is as follows:
(1) be ready to fiber grating and mass, the quality of mass is definite according to formula (1),
ω
2=k/m （1）
Wherein k is the rigidity of fiber grating, and ω is the natural frequency of mass, and m is the quality of mass;
The larger natural frequency of quality is less, when therefore selecting the mass quality, should can satisfy the object being measured vibration frequency with the natural frequency of mass and be advisable, the mass perforate is made into oscillator, the aperture is greater than fibre diameter, requires around the aperture mass balance and aperture to pass the mass barycenter during perforation;
(2) fiber grating passes oscillator, when placing oscillator and position, grid region, at first oscillator is placed frame center, subsequently the grid region is fixed in oscillator and frame center, and fixing used bonding agent requires to have high stability and high rigidity;
(3) the structural pretension screw of sensor frame is tightened, then will be separately fixed at the fiber grating two ends of oscillator on two terraced body structures on the framework;
(4) slowly unclamp screw fiber grating is carried out pretension, observe the state of fiber grating in the pretension process constantly, prevent that it from breaking.
The beneficial effect that the present invention produces is: novel high sensitivity optical fiber type vibration wire microseismic sensors adopts type vibration wire vibrations detecting structure, fiber grating is passed the oscillator barycenter, and apart from fiber grating one determining deviation fixed mass oscillator, oscillator directly acts on FBG after surveying the exterior vibration excitation, and that sensor has is simple in structure, compact, small and exquisite, exempt from electromagnetic interference (EMI), highly sensitive, bandwidth and low cost and other advantages.On sensor construction, adopt again unique pre-tensioner design, can fast and easily the FBG shock sensor be returned to zero and proofread and correct.
Description of drawings
Fig. 1 structural drawing of the present invention;
Terraced body structure on 1 signal processor, 2 fiber gratings, 3 grid regions, 4 supports, 5 masses, 6 descending stair body structures, 7 screws, 8 among the figure.
Embodiment
The present invention is described in detail below in conjunction with accompanying drawing:
Embodiment 1
High sensitivity optical fiber type vibration wire microseismic sensors, comprise a support 4 and a fiber grating 2, support 4 is one hollow, fiber grating 2 is positioned over hollow hollow position, and fiber grating 2 is fixed on the terraced body structure at hollow two ends, be provided with mass at described fiber grating 2, and described fiber grating 2 passes the barycenter of mass 5, and mass 5 will be fixed on hollow 4 centre position, the top of mass 5 is located in the grid region 3 of fiber grating 2, and described fiber grating one end links to each other with signal processor 1.Support 4 is hollow an of cubold, is provided with two and terraced body structure at hollow upper and lower side, and a groove is carved with in the central authorities of terraced body structure, and described fiber grating two ends are fixed in the groove of descending stair body structure.Hollow lower end comprises two-layer, and screw passes orlop, withstands on the upper strata, and the athletic meeting of screw is that the upper strata artificial body for generating becomes, and then fiber grating is carried out pretension.
High sensitivity optical fiber type vibration wire microseismic sensors, comprise a support 4 and a fiber grating 2, support 4 is one hollow, fiber grating 2 is positioned over hollow hollow position, and fiber grating 2 is fixed in the groove of terraced body structure at hollow sting two ends, be provided with mass at described fiber grating 2, and described fiber grating 2 passes the barycenter of mass 5, and mass 5 will be fixed on the centre position of support 4, the top of mass 5 is located in the grid region 3 of fiber grating 2, and described fiber grating one end links to each other with signal processor 1.Described support 4 is hollow an of cubold, is provided with two notched terraced body structures of central authorities at hollow two ends, the left and right sides, and the left side is divided into two-layerly, and the most left layer centre bit is equipped with a screw, and screw passes screw and withstands on the second layer.Mass 5 is regular geometric body body, such as cube, rectangular parallelepiped, spheroid or spheroid.
Two kinds of top its method for makings of structure are as follows:
(1) be ready to fiber grating 2 and mass 5, the quality of mass 5 is definite according to formula (1),
ω
2=k/m （1）
Wherein k is the rigidity of fiber grating 2, and ω is the natural frequency of mass 5, and m is the quality of mass 5;
The larger natural frequency of quality is less, when therefore selecting mass 5 quality, should can satisfy the object being measured vibration frequency with the natural frequency of mass 5 is advisable, mass 5 perforates are made into oscillator, the aperture is greater than the fiber grating diameter, requires around the aperture mass balance and aperture to pass mass 5 barycenter during perforation;
(2) fiber grating 2 passes oscillator, when placing oscillator and 3 position, grid region, at first oscillator is placed frame center, subsequently oscillator and frame center is fixed in grid region 3, and fixing used bonding agent requires to have high stability and high rigidity;
(3) the structural pretension screw 7 of sensor frame is tightened, then will be separately fixed at fiber grating 12 two ends of oscillator on two terraced body structures on the framework, namely on descending stair body structure 6 and the upper terraced body structure 8.
(4) slowly unclamp 7 pairs of fiber gratings of screw 2 and carry out pretension, observe the state of fiber grating 2 in the pretension process constantly, prevent that it from breaking.
Claims (7)
1. novel high sensitivity optical fiber type vibration wire microseismic sensors, it is characterized in that: comprise a support and a fiber grating, described support is one hollow, described fiber grating passes hollow hollow position, and fiber grating is fixed on hollow up and down on the notched terraced body structure in two ends, be provided with mass at described fiber grating, and described fiber grating passes the barycenter of mass, and mass will be fixed on hollow centre position, the centre position of mass and terraced body structure is located in the grid region of fiber grating, and described fiber grating links to each other with signal processor.
2. novel high sensitivity optical fiber type vibration wire microseismic sensors as claimed in claim 1, it is characterized in that: described support is hollow an of cubold, be provided with two terraced body structures at hollow upper and lower side, a groove is carved with in ladder body structure central authorities, and described fiber grating two ends are fixed in the groove of terraced body.
3. novel high sensitivity optical fiber type vibration wire microseismic sensors as claimed in claim 1, it is characterized in that: described support is hollow an of cubold, be provided with too two notched terraced body structures at hollow two ends, the left and right sides, about fiber grating is fixed in the groove of terraced body.
4. novel high sensitivity optical fiber type vibration wire microseismic sensors as claimed in claim 1, it is characterized in that: described support is hollow an of cubold, be provided with one in hollow upper end floor beam centre position and fall terraced body, there is two-layer crossbeam the lower end, also be provided with a positive terraced body in crossbeam centre position, upper strata, there is a groove at two terraced body structure centers, and described fiber grating two ends are fixed in two grooves.
5. novel high sensitivity optical fiber type vibration wire microseismic sensors as claimed in claim 4, it is characterized in that: in described hollow the two-layer crossbeam in lower end, lower floor crossbeam center has a screw, and screw passes lower floor's crossbeam, withstands on the crossbeam of upper strata.
6. novel high sensitivity optical fiber type vibration wire microseismic sensors as claimed in claim 1, it is characterized in that: described mass is regular geometric body body, such as cube, rectangular parallelepiped, spheroid or spheroid.
7. the method for making of novel high sensitivity optical fiber type vibration wire microseismic sensors is as follows, it is characterized in that:
(1) be ready to fiber grating and mass, the quality of mass is definite according to formula (1),
ω
2=k/m （1）
Wherein k is the rigidity of fiber grating, and ω is the natural frequency of mass, and m is the quality of mass;
The larger natural frequency of quality is less, therefore when selecting the mass quality, can satisfy the object being measured vibration frequency with the natural frequency of mass and be advisable, the mass perforate is made into oscillator, the aperture is greater than fibre diameter, requires around the aperture mass balance and aperture to pass the mass barycenter during perforation;
(2) fiber grating passes oscillator, when placing oscillator and position, grid region, at first oscillator is placed frame center, subsequently the grid region is fixed in oscillator and frame center, and fixing used bonding agent requires to have high stability and high rigidity;
(3) the structural pretension screw of sensor frame is tightened, then will be separately fixed at the fiber grating two ends of oscillator on two terraced body structures on the framework;
(4) slowly unclamp screw fiber grating is carried out pretension, observe the state of fiber grating in the pretension process constantly, prevent that it from breaking.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108362777A (en) * | 2018-04-17 | 2018-08-03 | 河海大学 | Fiber grating micro-vibration and voice sending sensor device of the type vibration wire based on micro-nano fiber |
| CN111174898A (en) * | 2020-03-31 | 2020-05-19 | 山东省科学院激光研究所 | Vibrating wire type wide-frequency fiber laser vibration sensor and application thereof |
| CN112146587A (en) * | 2020-09-11 | 2020-12-29 | 张东昱 | Bridge foundation scouring monitoring sensor and monitoring data analysis method thereof |
| CN114838680A (en) * | 2022-07-01 | 2022-08-02 | 中山大学 | Real-time monitoring system and method for riverbed scouring depth |
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| WO2006115511A1 (en) * | 2005-04-21 | 2006-11-02 | Northrop Grumman Corporation | Fiber optic accelerometer |
| CN201155991Y (en) * | 2007-12-20 | 2008-11-26 | 武汉理工大学 | Optical fibre grating acceleration sensor |
| CN203349921U (en) * | 2013-05-09 | 2013-12-18 | 山东大学 | New high-sensitivity fiber vibrating wire micro vibration sensor |
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2013
- 2013-05-09 CN CN201310168852.7A patent/CN103308145B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006115511A1 (en) * | 2005-04-21 | 2006-11-02 | Northrop Grumman Corporation | Fiber optic accelerometer |
| CN201155991Y (en) * | 2007-12-20 | 2008-11-26 | 武汉理工大学 | Optical fibre grating acceleration sensor |
| CN203349921U (en) * | 2013-05-09 | 2013-12-18 | 山东大学 | New high-sensitivity fiber vibrating wire micro vibration sensor |
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| 徐于超: "双光纤光栅推挽式加速度传感器设计与研究", 《中国优秀硕士学位论文全文数据库信息科技辑》 * |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108362777A (en) * | 2018-04-17 | 2018-08-03 | 河海大学 | Fiber grating micro-vibration and voice sending sensor device of the type vibration wire based on micro-nano fiber |
| WO2019200986A1 (en) * | 2018-04-17 | 2019-10-24 | 河海大学 | Vibration wire type micro-vibration and sound emission sensing device with micro-nanofiber based fiber grating |
| CN111174898A (en) * | 2020-03-31 | 2020-05-19 | 山东省科学院激光研究所 | Vibrating wire type wide-frequency fiber laser vibration sensor and application thereof |
| CN112146587A (en) * | 2020-09-11 | 2020-12-29 | 张东昱 | Bridge foundation scouring monitoring sensor and monitoring data analysis method thereof |
| CN112146587B (en) * | 2020-09-11 | 2022-06-21 | 张东昱 | Bridge foundation scouring monitoring sensor and monitoring data analysis method thereof |
| CN114838680A (en) * | 2022-07-01 | 2022-08-02 | 中山大学 | Real-time monitoring system and method for riverbed scouring depth |
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