CN216695254U - Low-frequency optical fiber Bragg grating vibration sensor - Google Patents
Low-frequency optical fiber Bragg grating vibration sensor Download PDFInfo
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- CN216695254U CN216695254U CN202123418920.XU CN202123418920U CN216695254U CN 216695254 U CN216695254 U CN 216695254U CN 202123418920 U CN202123418920 U CN 202123418920U CN 216695254 U CN216695254 U CN 216695254U
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- bragg grating
- fiber bragg
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- vibration sensor
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- 239000013307 optical fiber Substances 0.000 title claims description 38
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Abstract
The utility model discloses a low-frequency fiber Bragg grating vibration sensor, which comprises a first fiber Bragg grating FBG, a second fiber Bragg grating FBG, a mass block, a quartz tube, a shell, an upper cover and an arc body, wherein the upper edge and the lower edge of the mass block are designed by adopting a convex arc body structure, the mass block is only contacted with the inner side of the quartz tube at the upper edge and the lower edge, so that the mass block is only in wired contact with the quartz tube under the condition of keeping vertical, the mass block and the quartz tube are in clearance fit through a line to reduce friction, the outer wall of the quartz tube is in clearance fit with the inner wall of the shell, so that the relative displacement between the quartz tube and the shell is not generated, a mounting seat is mounted at a measuring position by penetrating a screw through a mounting hole on the mounting block, a base is placed in grooves of the mounting seat and a clamping plate, and is further in threaded connection with an internal thread hole by rotating a fixing screw, the clamping plate compresses the base, and is matched with the mounting seat together, carry out the centre gripping to the base and fix, and then install fixedly to this sensor.
Description
Technical Field
The utility model relates to the technical field of sensors, in particular to a low-frequency fiber Bragg grating vibration sensor.
Background
In the field of monitoring of micro-vibration signals, the detection technology based on the fiber bragg grating sensor has very obvious advantages: the optical fiber is anti-electromagnetic interference, electrically insulated, corrosion resistant and intrinsically safe, and can meet the use requirements of extreme climatic conditions such as high cold, high humidity and the like; secondly, the system sensitivity is high, and the application range is wide; thirdly, the mass is light, the volume is small, and the influence on the measured medium is small. In addition, the fiber grating sensor is easy to network, strong in system multiplexing capability and high in positioning accuracy. Based on the unique advantages, the fiber grating sensing technology is widely applied to the fields of underground engineering safety detection, perimeter intrusion behavior detection and target identification, building structure health detection, mechanical system vibration detection and the like.
At present, the fiber Bragg grating sensor has some defects, and in order to further optimize the fiber Bragg grating sensor, a low-frequency fiber Bragg grating vibration sensor is provided.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a low-frequency fiber Bragg grating vibration sensor to solve the problems in the background technology.
In order to achieve the purpose, the utility model provides the following technical scheme:
the low-frequency fiber Bragg grating vibration sensor comprises an optical fiber and a shell, wherein the shell is a cylindrical cavity, an upper cover is arranged at the upper end of the shell and is in threaded connection with the outer side of the upper end of the shell, a base is arranged at the lower end of the shell and is in threaded connection with the outer side of the lower end of the shell, an adjusting bolt is in threaded connection with the upper cover in a longitudinal penetrating manner, a quartz tube is sleeved on the inner side of the shell, a first fiber Bragg grating FBG and a second fiber Bragg grating FBG are arranged on the optical fiber, a mass block is arranged on the inner side of the quartz tube and is arranged at the middle position of the first fiber Bragg grating FBG and the second fiber Bragg grating FBG, two arc bodies are arranged at the upper end and the lower end of the mass block, and a through hole is formed in the mass block in a longitudinal penetrating manner.
As a further scheme of the utility model: the utility model discloses a clamping device for fixing a lamp, including base, mount pad, clamping plate, two internal thread holes and two fixed screw one-to-one setting, the one end of fixed screw runs through behind the connecting block with the internal thread hole threaded connection that corresponds, two installation pieces of bilateral symmetry fixedly connected with of mount pad, all run through on mount pad and the clamping plate and seted up the mounting hole with base assorted arc recess, two connecting blocks of bilateral symmetry fixedly connected with of clamping plate all run through on the mounting block and seted up the mounting hole with two fixed screw one-to-one setting, the one end of fixed screw run through behind the connecting block with the internal thread hole threaded connection that corresponds, two installation pieces of bilateral symmetry fixedly connected with of mount pad, two.
As a still further scheme of the utility model: the quartz tube is in clearance fit with the inner wall of the shell.
As a still further scheme of the utility model: the first and second fiber Bragg gratings FBG are identical gratings.
As a still further scheme of the utility model: the outer diameter of the mass block is in small clearance fit with the inner diameter of the quartz tube.
As a still further scheme of the utility model: the center of the base is longitudinally penetrated with a lower optical fiber leading-out hole, and the center of the adjusting bolt is longitudinally penetrated with an upper optical fiber leading-out hole.
As a still further scheme of the utility model: the casing is the cylinder cavity, and its diameter is 16mm, and length is 50 mm.
As a still further scheme of the utility model: the thickness of the mass block is 10 mm.
Compared with the prior art, the utility model has the beneficial effects that:
1. through the convex arc body structural design of edge adoption about the quality piece, the quality piece is only in upper and lower edge department and the inboard contact of quartz capsule for the quality piece is only wired contact with the quartz capsule under keeping the vertically condition, and the two passes through line clearance fit, reduces the friction, and the outer wall of quartz capsule and the inner wall clearance fit of casing make and do not produce relative displacement between the two.
2. Pass the mounting hole on the installation piece through the screw, install the mount pad in measurement position department, place the base in the recess of mount pad and clamp plate, and then make it and internal thread hole threaded connection through rotating the set screw, and then the clamp plate compresses tightly the base, and through the common cooperation of clamp plate and mount pad, it is fixed to carry out the centre gripping to the base, and then installs fixedly this sensor to the realization is with this sensor fixed mounting in measurement position department.
Drawings
Fig. 1 is a schematic structural diagram of a low-frequency fiber Bragg grating vibration sensor.
Fig. 2 is a schematic diagram of the local results in a low frequency fiber Bragg grating vibration sensor.
Fig. 3 is a partial cross-sectional view of a low frequency fiber Bragg grating vibration sensor.
Fig. 4 is a schematic perspective view of a mass block in a low-frequency fiber Bragg grating vibration sensor.
Fig. 5 is a top view of the low frequency fiber Bragg grating vibration sensor at the top cover.
Shown in the figure: the device comprises a first fiber Bragg grating FBG1, a second fiber Bragg grating FBG2, a mass block 3, a quartz tube 4, a shell 5, an upper cover 6, an adjusting bolt 7, a base 8, an internal threaded hole 9, a mounting block 10, a mounting hole 11, a mounting seat 12, a clamping plate 13, a fixing screw 14, a connecting block 15, a through hole 16, an arc body 17 and adhesive glue 18.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 5, in an embodiment of the present invention, a low-frequency fiber Bragg grating vibration sensor includes an optical fiber and a housing 5, where the housing 5 is a cylindrical cavity, an upper cover 6 is disposed at an upper end of the housing 5, the upper cover 6 is in threaded connection with an outer side of an upper end of the housing 5, a base 8 is disposed at a lower end of the housing 5, the base 8 is in threaded connection with an outer side of a lower end of the housing 5, an adjusting bolt 7 is longitudinally and threadedly connected to the upper cover 6, a quartz tube 4 is sleeved on an inner side of the housing 5, the quartz tube 4 is in clearance fit with an inner wall of the housing 5, the optical fiber is provided with a first fiber Bragg grating FBG1 and a second fiber Bragg grating FBG2, the first fiber Bragg grating FBG1 and the second fiber Bragg grating FBG2 are identical gratings, a central wavelength difference between the first fiber Bragg grating FBG1 and the second fiber Bragg grating FBG2 is unrelated to a temperature value, and the grating is designed to perform self-compensation on a temperature, the sensitivity of strain measurement is improved by two times, the mass block 3 is arranged on the inner side of the quartz tube 4, the mass block 3 is arranged at the middle position of the first fiber Bragg grating FBG1 and the second fiber Bragg grating FBG2 and fixedly connected with the first fiber Bragg grating FBG1 through a colloid, the upper end and the lower end of the mass block 3 are provided with two arc bodies 17, the two arc bodies 17 are small-diameter arc bodies, so that the mass block 3 and the inner wall of the quartz tube 4 are in a line contact state (the contact part between the mass block 3 and the quartz tube 4 is generally in a circular segment shape), the influence of friction between the mass block 3 and the quartz tube 4 on the output of the sensor is reduced, the outer diameter of the mass block 3 and the inner diameter of the quartz tube 4 are in small-gap fit, the transverse movement of the mass block 3 is not influenced while the transverse movement of the mass block 3 in the axial direction, the transverse interference resistance of the sensor can be improved, and the mass block 3 is longitudinally provided with a through hole 16, the mass block 3 is vertically penetrated and provided with a through hole 16, the mutual connection part of the first fiber Bragg grating FBG1 and the second fiber Bragg grating FBG2 vertically penetrates through the mass block 3 through the through hole 16 and is fixedly connected with the mass block 3 through an adhesive 18 fixedly filled in the through hole 16, two ends of the optical fiber are fixed with the base 8 and the adjusting bolt 7 through glue and are always in a tensioned state, the two springs are equivalent to two springs and form a double-spring-vibrator system with the mass block 3, the first fiber Bragg grating FBG1 and the second fiber Bragg grating FBG2 are two sections of gratings engraved on one optical fiber at a certain distance, the center of the base 8 is longitudinally penetrated and provided with a lower fiber leading-out hole, the center of the adjusting bolt 7 is longitudinally penetrated and provided with an upper fiber leading-out hole, the outer side of the base 8 is sleeved with a mounting seat 12 and a clamping plate 13, the mounting seat 12 and the clamping plate 13 are both provided with arc-shaped grooves matched with the base 8, two connecting blocks 15 of bilateral symmetry fixedly connected with of clamp plate 13, two all run through on the connecting block 15 and seted up connecting block 15, two all correspond on the connecting block 15 and be provided with fixed screw 14, two internal thread hole 9, two have been seted up to the symmetry on mount pad 12 internal thread hole 9 sets up with two fixed screw 14 one-to-one, and fixed screw 14's one end runs through behind connecting block 15 and the internal thread hole 9 threaded connection who corresponds, two installation piece 10 of bilateral symmetry fixedly connected with of mount pad 12, two all run through on the installation piece 10 and seted up mounting hole 11, upper cover 6 is the same with adjusting bolt 7 threaded connection's pitch, revolves to opposite, does the evacuation in casing 5 and handles, casing 5 is the cylinder cavity, and its diameter is 16mm, and length is 50mm, the thickness of quality piece 3 is 10 mm.
The response frequency range of the sensor is 0-300 Hz, the sensor is suitable for low-frequency seismic signal measurement between 0-100 Hz, the FBG wavelength variation range of the sensor is +/-0.5 nm, FC/APC interfaces are reserved at the upper end and the lower end of the sensor, all the sensors can be connected conveniently by using the adapter flange, and networking is easy.
(1) The mass block 3 is connected with the optical fiber
Two sections of gratings, namely a first fiber Bragg grating FBG1 and a second fiber Bragg grating FBG2, are engraved on one optical fiber at a certain distance, the mass block 3 is vertically fixed, the grating string penetrates through the through hole 16 of the mass block 3 from bottom to top, the position of the optical fiber is adjusted to be positioned at the center of the through hole 16, the position of the optical fiber is kept and glue is injected, and the connection between the mass block 3 and the optical fiber is completed.
(2) The optical fiber is connected with the housing 5
After the quartz tube 4 and the shell 5 are assembled, one end of the fixed mass block 3 and one end of the grating string penetrate through the shell 5 and the base 8 from inside to outside, the shell 5 and the base 8 are screwed, the position of the optical fiber is adjusted, glue is injected into an optical fiber leading-out hole at the bottom end of the shell 5 to fix the lower end of the optical fiber, the other end of the optical fiber penetrates through an upper optical fiber leading-out hole in the upper cover 6 and the adjusting bolt 7 from inside to outside, the upper cover 6 and the shell 5 are screwed, the position of the mass block 3 is fixed, tail fibers are welded at two ends of the optical fiber, and a fiber grating demodulator is connected.
(3) Pre-tension loading
Adjusting the position of the optical fiber to be positioned at the center of the upper optical fiber leading-out hole of the adjusting bolt, adjusting the pretension force, observing the wavelength change, fixing the position of the optical fiber and the load when the drift amount of the wavelength meets the requirement, filling the upper optical fiber leading-out hole of the adjusting bolt with colloid, and keeping the tension state until the colloid is completely solidified.
The working principle of the utility model is as follows:
the shell 5 is vacuumized to reduce air, the upper edge and the lower edge of the mass block 3 are designed into a convex arc body 17 structure, the mass block 3 is only contacted with the inner side of the quartz tube 4 at the upper edge and the lower edge, so that the mass block 3 is only in wired contact with the quartz tube 4 under the condition of keeping the vertical, the two are in clearance fit through a line, the friction is reduced, the outer wall of the quartz tube 4 is in clearance fit with the inner wall of the shell 5, so that the relative displacement between the two is not generated, the centers of the base 8 and the adjusting bolt 7 are respectively provided with an optical fiber leading-out hole for transmitting signals, the upper end and the lower end of the optical fiber are fixed through colloid at the leading-out hole, the prestress of the optical fiber can be adjusted through the adjusting bolt 7, so that the optical fiber is always kept in a tensioning state, when the vibration acceleration exists, the mass block 3 generates the relative displacement to cause the wavelength change of the optical fiber grating, and the displacement condition of the central mass block of the sensor can be obtained by demodulating the change condition of the central wavelength of the optical fiber grating, the size and the direction of the seismic signal of the sensor position can be obtained by reverse solution through a physical model of the double-spring oscillator, the mounting base 12 is mounted at the measuring position through a mounting hole 11 in the mounting block 10 penetrated by a screw, the base 8 is placed in grooves of the mounting base 12 and the clamping plate 13, and then the base is in threaded connection with the internal thread hole 9 through rotation of the fixing screw 14, and then the clamping plate 13 compresses the base 8, and through the common matching of the clamping plate 13 and the mounting base 12, the base 8 is clamped and fixed, and then the sensor is fixedly mounted, so that the sensor is fixedly mounted at the measuring position.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof.
Claims (8)
1. Low frequency optic fibre Bragg grating vibration sensor, including optic fibre and casing (5), its characterized in that: the improved structure is characterized in that the shell (5) is a cylindrical cavity, an upper cover (6) is arranged at the upper end of the shell (5), the upper cover (6) is in threaded connection with the outer side of the upper end of the shell (5), a base (8) is arranged at the lower end of the shell (5), the base (8) is in threaded connection with the outer side of the lower end of the shell (5), an adjusting bolt (7) is longitudinally connected to the upper cover (6) in a penetrating manner, a quartz tube (4) is sleeved on the inner side of the shell (5), a first optical fiber Bragg grating FBG (1) and a second optical fiber Bragg grating FBG (2) are arranged on optical fibers, a mass block (3) is arranged on the inner side of the quartz tube (4), two arc bodies (17) are arranged at the upper end and the lower end of the mass block (3), and a through hole (16) is longitudinally formed in the mass block (3) in a penetrating manner.
2. The low frequency fiber Bragg grating vibration sensor of claim 1, wherein: the outer side of the base (8) is sleeved with a mounting seat (12) and a clamping plate (13), the mounting seat (12) and the clamping plate (13) are both provided with arc-shaped grooves matched with the base (8), two connecting blocks (15) are symmetrically and fixedly connected with two sides of the clamping plate (13), the two connecting blocks (15) are respectively provided with a connecting block (15) in a penetrating way, the two connecting blocks (15) are respectively provided with a fixing screw (14) correspondingly, two internal thread holes (9) are symmetrically arranged on the mounting seat (12), the two internal thread holes (9) are arranged corresponding to two fixing screws (14) one by one, one end of each fixing screw (14) is connected with the corresponding internal thread hole (9) in a threaded manner after penetrating through the connecting block (15), the two symmetrical fixedly connected with of both sides of mount pad (12) have two installation pieces (10), two all run through on installation piece (10) and seted up mounting hole (11).
3. The low frequency fiber Bragg grating vibration sensor of claim 1, wherein: the mass block (3) is arranged in the middle of the first fiber Bragg grating FBG (1) and the second fiber Bragg grating FBG (2).
4. The low frequency fiber Bragg grating vibration sensor of claim 1, wherein: the quartz tube (4) is in clearance fit with the inner wall of the shell (5).
5. The low frequency fiber Bragg grating vibration sensor of claim 1, wherein: the first fiber Bragg grating FBG (1) and the second fiber Bragg grating FBG (2) are identical gratings.
6. The low frequency fiber Bragg grating vibration sensor of claim 1, wherein: the center of the base (8) is longitudinally penetrated and provided with a lower optical fiber leading-out hole, and the center of the adjusting bolt (7) is longitudinally penetrated and provided with an upper optical fiber leading-out hole.
7. The low frequency fiber Bragg grating vibration sensor of claim 1, wherein: the shell (5) is a cylindrical cavity, the diameter of the shell is 16mm, and the length of the shell is 50 mm.
8. The low frequency fiber Bragg grating vibration sensor of claim 1, wherein: the thickness of the mass block (3) is 10 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123418920.XU CN216695254U (en) | 2021-12-30 | 2021-12-30 | Low-frequency optical fiber Bragg grating vibration sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123418920.XU CN216695254U (en) | 2021-12-30 | 2021-12-30 | Low-frequency optical fiber Bragg grating vibration sensor |
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| Publication Number | Publication Date |
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| CN216695254U true CN216695254U (en) | 2022-06-07 |
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| CN202123418920.XU Expired - Fee Related CN216695254U (en) | 2021-12-30 | 2021-12-30 | Low-frequency optical fiber Bragg grating vibration sensor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114964339A (en) * | 2022-06-17 | 2022-08-30 | 中国工程物理研究院激光聚变研究中心 | Optical fiber sensing box |
| CN115220089A (en) * | 2022-08-11 | 2022-10-21 | 西北大学 | Fiber grating detector based on additional transverse force loading |
-
2021
- 2021-12-30 CN CN202123418920.XU patent/CN216695254U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114964339A (en) * | 2022-06-17 | 2022-08-30 | 中国工程物理研究院激光聚变研究中心 | Optical fiber sensing box |
| CN114964339B (en) * | 2022-06-17 | 2024-06-11 | 中国工程物理研究院激光聚变研究中心 | Optical fiber sensing box |
| CN115220089A (en) * | 2022-08-11 | 2022-10-21 | 西北大学 | Fiber grating detector based on additional transverse force loading |
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Granted publication date: 20220607 |