CN111982265A - Packaging structure of two-dimensional vibration sensor based on fiber grating - Google Patents
Packaging structure of two-dimensional vibration sensor based on fiber grating Download PDFInfo
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- CN111982265A CN111982265A CN201910424405.0A CN201910424405A CN111982265A CN 111982265 A CN111982265 A CN 111982265A CN 201910424405 A CN201910424405 A CN 201910424405A CN 111982265 A CN111982265 A CN 111982265A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
- G01H9/004—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors
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Abstract
The invention discloses a packaging structure of a two-dimensional vibration sensor based on fiber bragg gratings, which comprises a shell, an elastic body, a first fiber bragg grating and a second fiber bragg grating, wherein the elastic body comprises a mass block positioned at the upper end, a hinge part positioned in the middle and a base, the first fiber bragg grating and the second fiber bragg grating are adhered in grooves of the mass block and the base under the action of prestress, and a grid region is suspended and distributed between the mass block and the base. The upper half part of the mass block is a hemisphere, the lower half part of the mass block is a cylinder, and the middle hinge part comprises two orthogonally arranged hinges. The shell appearance is the cuboid, and the centre is equipped with the blind hole, and the bottom is equipped with the boss and the screw hole of indent, and boss part side is the rectangle. The problems that the two-dimensional vibration sensor package is difficult to determine the measuring direction during installation, the installation stability is low, and optical signal loss is easy to generate are solved.
Description
Technical Field
The invention belongs to the technical field of fiber grating vibration sensors, and particularly relates to a packaging structure of a two-dimensional vibration sensor based on fiber gratings.
Background
The two-dimensional vibration sensor based on the fiber grating type has the characteristics of electromagnetic interference resistance, high reliability, easiness in multiplexing and the like, and is one of hot spots for research and application of the fiber grating. However, many current vibration sensors based on FBG design are mostly packaged by a cylindrical housing for measurement. The sensor is packaged in such a way, when the sensor is installed in experiment and measurement application, the installation surface is narrow, the measurement direction of the sensor cannot be accurately determined, so that a measurement result may generate a large system error, and the accurate measurement is not facilitated. Moreover, most of the fiber bragg gratings on the FBG-based two-dimensional sensor are connected with a jumper, so that a channel is occupied in the demodulation process, the characteristic of fiber bragg grating multiplexing cannot be exerted, and the signal expansion is not facilitated.
Patent CN201611157807.1 has designed a range adjustable fiber grating two-dimensional vibration sensor, and it adopts cylindrical shell to encapsulate, need design complementary unit during the installation to the measuring direction of sensor can not accurate the definite, and the stability of installation is not high, produces installation error easily. Patent cn201711229418.x designs a small fiber grating two-dimensional vibration sensor, in which an optical fiber needs to be bent during packaging, and the bending radius is small, which easily causes loss of an optical signal.
Disclosure of Invention
The invention aims to solve the technical problems that a packaging structure of a two-dimensional vibration sensor based on fiber bragg gratings is provided, and the packaging structure solves the problems that the measurement direction is not easy to determine, the mounting stability is not high, and the optical signal loss is easy to generate when the two-dimensional vibration sensor is packaged.
The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a packaging structure of two-dimentional vibration sensor based on fiber grating, this packaging structure includes shell, elastomer, first fiber grating and second fiber grating, and the elastomer is including the quality piece that is located the upper end, the hinge portion and the base that are located the middle part, pastes first fiber grating and second fiber grating in the groove of quality piece and base under the effect of prestressing force, and the unsettled distribution of grid area is between quality piece and base.
According to the technical scheme, the upper half part of the mass block is a hemisphere, the lower half part of the mass block is a cylinder, and the middle hinge part comprises two orthogonally arranged hinges.
According to the technical scheme, the shell is a cuboid, the middle of the shell is provided with the blind hole, the bottom of the shell is provided with the concave boss and the threaded hole, and the side face of the boss part is rectangular.
According to the technical scheme, four optical fiber pasting grooves are uniformly distributed on the surface of the upper cylinder of the base, the side surface of the lower circular truncated cone part is rectangular, four small through holes are uniformly distributed at positions corresponding to the grooves, the diameters of the cylinders of the mass block base are the same, and the four optical fiber pasting grooves are uniformly distributed correspondingly.
According to the technical scheme, the grooves in the elastic body are arranged on the surfaces of the mass block and the cylindrical part of the base, the positions of the holes in the base corresponding to the grooves are distributed, and the aperture is larger than the groove width.
According to the technical scheme, before the first fiber grating and the second fiber grating are pasted, the coating layer on the surface of the grating area fiber is removed through the organic solvent, the fiber grating is left on the non-pasted part, one end of the fiber grating penetrates out of the hole in the lower part of the base, the other end of the fiber grating winds to the opposite side of the fiber grating from the upper hemispherical part of the mass block, the fiber grating is pasted in the corresponding groove, and then the fiber grating penetrates out of the hole in the lower part of the base.
According to the technical scheme, the elastomer is installed in the shell, the diameter of the blind hole is larger than that of the elastomer cylinder, the boss is matched with the lower round table of the base, and the two rectangular side faces are overlapped.
According to the technical scheme, the sensor packaging head is a hollow shell, and the non-adhered parts of the first fiber bragg grating and the second fiber bragg grating directly penetrate into the sensor packaging head after penetrating out of the hole in the lower part of the base and penetrate out of the optical fiber protective sleeve; the shell, the elastic body and the sensor packaging head are all made of metal materials.
According to above-mentioned technical scheme, sensor encapsulation head is for leaking hopper-shaped, and its top is equipped with the screw thread.
According to above-mentioned technical scheme, sensor encapsulation head passes through threaded connection with the shell, compresses tightly the elastomer simultaneously.
The invention has the following beneficial effects:
1) the optical fiber of the sensor is completely packaged in the metal shell, so that the sensor is not easy to damage, and the packaging size is small and the structure is simple.
2) The surface coating of the grating area and the optical fiber near the grating area is removed before the fiber grating is pasted, the fiber grating is pasted firmly when being loaded and pasted, and the wavelength drift amount of the fiber grating is changed slightly after being unloaded.
3) The measuring direction of the sensor is perpendicular to the surface of the rectangular shell, and the measuring direction of the sensor can be marked on the surface of the shell.
4) The radius of the bent part of the optical fiber in the sensor is larger, and the transmission loss of optical signals is low.
5) The optical fibers at the two ends of the fiber grating penetrate out of the sensor, so that the two optical fibers can be connected in series, and single-channel demodulation is realized.
6) The outlet of the fiber grating is positioned at the bottom of the sensor, so that the working stability is high.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a diagram of an overall package structure of a two-dimensional vibration sensor according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a sensor housing according to an embodiment of the present invention;
FIG. 3 is a three-dimensional view of an elastomer in an embodiment of the invention;
FIG. 4 is an isometric view of an elastomer in an embodiment of the invention;
reference numerals: 1. the optical fiber sensor comprises a shell, 2 parts of an elastic body, 3 parts of a first fiber bragg grating, 4 parts of a second fiber bragg grating, 5 parts of a sensor packaging head, 6 parts of an optical fiber protective sleeve, 1-1 parts of a blind hole, 1-2 parts of a boss, 1-3 parts of a threaded hole, 2-1 parts of a mass block, 2-2 parts of a hinge part and 2-3 parts of a base.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the embodiment of the invention, as shown in fig. 1-4, a package structure of a fiber grating-based two-dimensional vibration sensor is provided, the package structure comprises a housing 1, an elastic body 2, a first fiber grating 3, a second fiber grating 4 sensor package head 5, and a fiber protection sleeve 6, the housing is cuboid in shape, a blind hole 1-1 is formed in the middle, an inward-concave boss 1-2 and a threaded hole 1-3 with a certain depth are formed at the bottom, and the side face of the boss 1-2 is rectangular. The elastic body includes a mass 2-1 at an upper end, a hinge portion 2-2 at a middle, and a base 2-3 at a lowermost end. Wherein the upper half part of the mass block 2-1 is a hemisphere, the lower half part is a cylinder, and the diameter of the cylinder is slightly larger than that of the hemisphere. The middle hinge part 2-2 comprises two orthogonally arranged hinges, the directions of rotation of which are the x-direction and the y-direction, respectively. Four optical fiber sticking grooves are uniformly distributed on the surface of an upper cylinder of the base 2-3, the side surface of the lower round table part is rectangular, and four small through holes are uniformly distributed at positions corresponding to the grooves. The diameter of the cylinder of the mass block 2-1 and the cylinder of the base 2-3 are the same, and four grooves for adhering optical fibers are correspondingly and uniformly distributed. The sensor package head 5 is funnel-shaped with threads at its uppermost end. The shell 1, the elastic body 2 and the sensor packaging head 5 are made of metal materials.
The grooves on the elastic body 2 are along the direction of the z-axis and are arranged on the surfaces of the cylindrical parts of the mass block 2-1 and the base 2-3. The holes on the base 2-3 are distributed corresponding to the positions of the grooves, and the hole diameter is larger than the groove width. Before the first fiber grating 3 and the second fiber grating 4 are pasted, organic solvent is needed to remove the grid area and the coating layer on the surface of the optical fiber nearby the grid area, then the grid area is pasted in the grooves of the mass block 2-1 and the base 2-3 under the action of prestress, the axial direction of the fiber grating is parallel to the direction of the z axis, and the grid area is suspended and distributed between the mass block 2-1 and the base 2-3. One end of the rest part of the fiber bragg grating which is not adhered directly penetrates out of the hole in the lower part of the base 2-3, and the other end of the fiber bragg grating winds around the upper hemispherical part of the mass block 2-1 to be adhered in the corresponding groove and then penetrates out of the hole in the lower part of the base 2-3. The radial direction of the first fiber grating 3 is parallel to the x-axis, and the radial direction of the second fiber grating 4 is parallel to the y-axis.
The elastomer is arranged in the shell 1, the diameter of the blind hole 1-1 is larger than that of the cylinder of the elastomer 3, the boss 1-2 is matched with the lower round table of the base 2-3, the two rectangular side surfaces are overlapped, and the round table is slightly higher than the boss in depth. The sensor packaging head 5 is connected with the shell 1 through threads, and simultaneously compresses the elastic body 2 to prevent the elastic body 3 from moving along the z direction. The optical fiber protective sleeve 6 is adhered to the tail end of the sensor packaging head 5 through industrial glue. The sensor packaging head 4 is a hollow shell, and the non-adhered parts of the first fiber bragg grating 3 and the second fiber bragg grating 4 directly penetrate into the sensor packaging head 4 after penetrating out of the hole in the lower part of the base 2-3 and finally penetrate out of the optical fiber protection sleeve 6.
The specific implementation steps are as follows:
s1: and soaking the fiber grating and the optical fibers on two sides of the fiber grating in an organic solvent, and removing the coating layer.
S2: and loading the fiber bragg grating, simultaneously pasting the fiber bragg grating between the mass block and the base of the elastic body to enable the fiber bragg grating to be in a suspension state, then enabling one end of the remaining optical fiber to penetrate out of the hole in the base of the elastic body, enabling the other section of the remaining optical fiber to wind around 180 degrees from the hemisphere at the upper part of the mass block, pasting the remaining optical fiber in the groove opposite to the fiber bragg grating, and penetrating out of the corresponding hole in the base.
S3: the elastic body is placed in the shell, and the rectangular side face of the lower round table of the elastic body base is overlapped with the rectangular side face of the boss in the shell.
S4: and connecting the optical fiber protective sleeve to the tail end of the sensor packaging head through industrial glue.
S5: through threaded connection, connect sensor encapsulation head on the shell, wherein sensor encapsulation head compresses tightly the elastomer when connecting, and the optic fibre passes sensor encapsulation head at last, stretches out from optic fibre protective case.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (10)
1. The utility model provides a packaging structure of two-dimentional vibration sensor based on fiber grating which characterized in that, this packaging structure includes shell, elastomer, first fiber grating and second fiber grating, and the elastomer is including the quality piece that is located the upper end, the hinge portion and the base that are located the middle part, pastes first fiber grating and second fiber grating in the groove of quality piece and base under the effect of prestressing force, and the unsettled distribution of grid region is between quality piece and base.
2. The package structure of the fiber grating-based two-dimensional vibration sensor according to claim 1, wherein the upper half of the mass is a hemisphere, the lower half is a cylinder, and the middle hinge portion comprises two orthogonally arranged hinges.
3. The package structure of the fiber grating-based two-dimensional vibration sensor according to claim 1 or 2, wherein the housing has a rectangular shape, a blind hole is formed in the middle of the housing, an inwardly concave boss and a threaded hole are formed in the bottom of the housing, and the side surface of the boss is rectangular.
4. The package structure of the fiber grating-based two-dimensional vibration sensor according to claim 1 or 2, wherein four fiber pasting grooves are uniformly distributed on the surface of the upper cylinder of the base, the side surface of the lower circular truncated cone portion is rectangular, four small through holes are uniformly distributed at positions corresponding to the grooves, the diameter of the cylinder of the mass block base is the same, and four grooves for pasting fibers are uniformly distributed correspondingly.
5. The package structure of the fiber grating-based two-dimensional vibration sensor according to claim 1 or 2, wherein the grooves on the elastic body are located on the surfaces of the mass block and the cylindrical portion of the base, the holes on the base are distributed corresponding to the positions of the grooves, and the aperture is larger than the width of the grooves.
6. The package structure of the fiber grating-based two-dimensional vibration sensor according to claim 1 or 2, wherein the coating layer on the surface of the optical fiber in the gate region is removed by an organic solvent before the first fiber grating and the second fiber grating are bonded, the remaining unbonded portion of the fiber grating has one end penetrating through the hole in the lower portion of the base and the other end winding around the upper hemispherical portion of the mass block to the opposite side of the fiber grating, and is bonded in the corresponding groove and then penetrates through the hole in the lower portion of the base.
7. The package structure of the fiber grating-based two-dimensional vibration sensor according to claim 1 or 2, wherein the elastic body is installed in the housing, the diameter of the blind hole is larger than that of the elastic body cylinder, the boss is matched with the lower round table of the base, and the two rectangular side surfaces are overlapped.
8. The package structure of the fiber grating-based two-dimensional vibration sensor according to claim 1 or 2, further comprising a sensor package head, wherein the sensor package head is a hollow housing, and the non-bonded portions of the first fiber grating and the second fiber grating directly penetrate into the sensor package head after penetrating out of the hole of the lower portion of the base and penetrate out of the fiber protective sleeve; the shell, the elastic body and the sensor packaging head are all made of metal materials.
9. The package structure of the fiber grating-based two-dimensional vibration sensor according to claim 1 or 2, wherein the sensor package head is funnel-shaped, and the uppermost end of the sensor package head is provided with a thread.
10. The package structure of the fiber grating-based two-dimensional vibration sensor according to claim 9, wherein the sensor package head is screwed to the housing while pressing the elastic body.
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| CN201910424405.0A CN111982265A (en) | 2019-05-21 | 2019-05-21 | Packaging structure of two-dimensional vibration sensor based on fiber grating |
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| CN201910424405.0A CN111982265A (en) | 2019-05-21 | 2019-05-21 | Packaging structure of two-dimensional vibration sensor based on fiber grating |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003076887A1 (en) * | 2002-03-13 | 2003-09-18 | Light Structures As | Fiber optic sensor package |
| CN2578832Y (en) * | 2002-11-14 | 2003-10-08 | 钟少龙 | Temperature self-compensated differential optical fibre acceleration sensor probe |
| CN103148894A (en) * | 2013-02-04 | 2013-06-12 | 中国科学院半导体研究所 | Angle stress sensor based on optical fiber Bragg gratings |
| CN104483008A (en) * | 2014-12-09 | 2015-04-01 | 西安石油大学 | Fiber grating three-dimensional vibration sensor |
| CN106814216A (en) * | 2017-01-24 | 2017-06-09 | 武汉理工大学 | The round flexible hinge optical fibre grating acceleration sensor of Integral direct |
| CN108007553A (en) * | 2017-11-29 | 2018-05-08 | 武汉理工大学 | A kind of miniature fiber grating two-dimension vibration sensor |
-
2019
- 2019-05-21 CN CN201910424405.0A patent/CN111982265A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003076887A1 (en) * | 2002-03-13 | 2003-09-18 | Light Structures As | Fiber optic sensor package |
| CN2578832Y (en) * | 2002-11-14 | 2003-10-08 | 钟少龙 | Temperature self-compensated differential optical fibre acceleration sensor probe |
| CN103148894A (en) * | 2013-02-04 | 2013-06-12 | 中国科学院半导体研究所 | Angle stress sensor based on optical fiber Bragg gratings |
| CN104483008A (en) * | 2014-12-09 | 2015-04-01 | 西安石油大学 | Fiber grating three-dimensional vibration sensor |
| CN106814216A (en) * | 2017-01-24 | 2017-06-09 | 武汉理工大学 | The round flexible hinge optical fibre grating acceleration sensor of Integral direct |
| CN108007553A (en) * | 2017-11-29 | 2018-05-08 | 武汉理工大学 | A kind of miniature fiber grating two-dimension vibration sensor |
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Application publication date: 20201124 |