Optical fiber micro-displacement sensor

Abstract

The utility model discloses an optical fiber micro-displacement sensor which comprises a driving assembly, a sliding assembly, a lifting assembly, a shielding piece and an optical fiber lens assembly. The driving assembly is connected with the sliding assembly, and the driving assembly is used for pushing the sliding assembly to slide in the first direction; the lifting assembly abuts against the sliding assembly, and the sliding assembly is used for driving the lifting assembly to move in the second direction; the stroke of the sliding assembly in the first direction is larger than that of the lifting assembly in the second direction. The shielding piece is connected with the lifting assembly, and the lifting assembly is used for driving the shielding piece to move in the second direction; the shielding piece is located on the optical path of the optical fiber lens assembly and used for adjusting the passing amount of light on the optical path of the optical fiber lens assembly, and fine adjustment of the displacement of the shielding piece is achieved by converting large displacement of the sliding assembly in the first direction into small displacement of the lifting assembly in the second direction. Therefore, the resolution of the optical fiber displacement sensor is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of optical fiber sensors, in particular to an optical fiber micro-displacement sensor. Background Art

[0002] Fiber optic displacement sensors, as a sensor based on optical principles, use optical fibers as sensing elements and measure the displacement of objects by detecting changes in the transmission characteristics of light intensity in the optical fiber. Common fiber optic displacement sensors currently on the market usually include a shielding member and a fiber optic lens assembly. The amount of light passing through the optical path of the fiber optic lens assembly is adjusted by changing the position of the shielding member, thereby achieving displacement measurement. However, existing fiber optic displacement sensors cannot achieve small displacements of the shielding member when adjusting the displacement of the shielding member, resulting in a low resolution of the displacement sensor. Utility Model Content

[0003] In order to solve the problems existing in the prior art, the utility model provides an optical fiber micro-displacement sensor.

[0004] The technical solution adopted in this utility model is:

[0005] A fiber optic micro-displacement sensor comprises a drive assembly, a sliding assembly, a lifting assembly, a shielding member and a fiber optic lens assembly; the drive assembly is connected to the sliding assembly, and the drive assembly is used to push the sliding assembly to slide in a first direction; the lifting assembly abuts against the sliding assembly, and the sliding assembly is used to drive the lifting assembly to move in a second direction; the stroke of the sliding assembly in the first direction is greater than the stroke of the lifting assembly in the second direction; the shielding member is connected to the lifting assembly, and the lifting assembly is used to drive the shielding member to move in the second direction; the shielding member is located in the optical path of the fiber optic lens assembly, and the shielding member is used to adjust the amount of light passing through the optical path of the fiber optic lens assembly.

[0006] Preferably, it further includes a support member, and the driving assembly, sliding assembly, and optical fiber lens assembly are all arranged on the support member.

[0007] Preferably, the driving assembly includes: a first fixing member and a pushing member, the first fixing member is connected to the supporting member, the sliding assembly is located on one side of the first fixing member, a first through hole is provided on the first fixing member, one end of the pushing member passes through the through hole and is connected to the sliding assembly, and the pushing member moves along the axial direction of the first through hole.

[0008] Preferably, one end of the pushing member is provided with an external thread, the inner wall of the first through hole is provided with an internal thread matching the external thread on the pushing member, one end of the pushing member is threadedly connected to the inner wall of the first through hole, and the pushing member abuts against the sliding assembly.

[0009] Preferably, the fiber optic lens assembly includes a housing, a first fiber optic lens head, and a second fiber optic lens head. The housing is connected to the support member, the housing is hollow, the first fiber optic lens head and the second fiber optic lens head are arranged opposite to each other in the housing, and an optical path is formed between the first fiber optic lens head and the second fiber optic lens head; the shielding member is located between the first fiber optic lens head and the second fiber optic lens head;

[0010] A second through hole is provided at the bottom of the shell, and a portion of the body of the lifting assembly passes through the second through hole and is connected to the shielding member. The second through hole is used to limit the movement of the lifting assembly along the first direction.

[0011] Preferably, the sliding assembly includes a second fixing member and a sliding member, the second fixing member is arranged on the supporting member, a sliding groove is provided on the top of the second fixing member, the sliding member is slidably connected to the sliding groove, a track groove is provided on the top of the sliding member, one side of the track groove is higher, and the other side of the track groove is lower, the bottom of the lifting assembly is located in the track groove, and when the track groove moves along the first direction, it drives the lifting member to move along the second direction.

[0012] Preferably, the lifting assembly includes a lifting member and a roller, the bottom of the lifting member is rotatably connected to the roller, the roller abuts against the track groove, and the top of the lifting member is penetrated by the second through hole and connected to the shielding member;

[0013] A placement cavity is provided on the lifting member, the shielding member is located in the placement cavity, both sides of the placement cavity are set as openings, the openings on both sides of the placement cavity are used for the light path to pass through, a first blind hole is provided at the bottom of the placement cavity, and the bottom of the shielding member is connected to the first blind hole.

[0014] Preferably, the size of the shielding member gradually decreases or increases along the second direction.

[0015] Preferably, it also includes a first reset component, which is connected to the sliding member, and the first reset component includes a third fixing member, a first guide member and a first elastic member, the third fixing member is connected to the support member, and the third fixing member is arranged opposite to the first fixing member, one end of the first guide member is connected to the third fixing member, a second blind hole is opened at one end of the sliding member, the other end of the first guide member is located in the second blind hole, the length of the first guide member is less than the depth of the second blind hole, the first elastic member is sleeved on the first guide member, one end of the first elastic member is connected to the third fixing member, and the other end of the first elastic member is connected to the inner wall of the second blind hole.

[0016] Preferably, it further includes a second reset component, the second reset component is connected to the lifting member, the second reset component includes a fourth fixing member and a second elastic member, one end of the fourth fixing member is connected to the inner wall of the shell, the other end of the fourth fixing member is slidably connected to the lifting member, the fourth fixing member is hollow inside, the second elastic member is located in the fourth fixing member, one end of the second elastic member is connected to the top inner wall of the fourth fixing member, and the other end of the second elastic member is connected to the top of the lifting member

[0017] The beneficial effects of the present utility model are as follows: the driving component pushes the sliding component to slide along the first direction, and the first direction displacement of the sliding component can be converted into the second direction displacement of the lifting component, and the lifting component drives the shielding member to move in the second direction, thereby changing the amount of light passing through. Since the larger displacement of the sliding component in the first direction can be converted into the smaller displacement of the lifting component in the second direction, fine adjustment of the displacement of the shielding member is achieved. Since the displacement of the shielding member becomes more subtle and controllable, the change in the amount of light passing through can be controlled more accurately, thereby improving the resolution of the sensor, enabling the sensor to capture smaller displacement changes and meet the needs of high-precision measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a front perspective structural diagram of the first embodiment of the present utility model;

[0019] Figure 2 This is a schematic diagram of the three-dimensional structure of the first embodiment of the present utility model;

[0020] Figure 3 This is a front perspective structural diagram of the second embodiment of the present utility model;

[0021] Figure 4 This is a schematic diagram of the three-dimensional structure of the second embodiment of the present utility model;

[0022] Figure 5 This is a schematic diagram of the three-dimensional structure of the lifting assembly of the second embodiment of the present utility model;

[0023] Figure 6 This is a side cross-sectional structural diagram of the lifting assembly of the second embodiment of the present utility model;

[0024] Figure 7 This is a schematic diagram of the three-dimensional structure of the lifting member of the second embodiment of the present utility model;

[0025] Figure 8 for Figure 3 Schematic diagram of the enlarged structure at A in the middle;

[0026] Figure 9 Schematic diagram of the side cross-sectional structure of the sliding member;

[0027] Figure 10 2 is a side structural diagram of the first reset assembly;

[0028] Figure 11 is a schematic diagram of the front view structure of the second service component;

[0029] Figure 12 Schematic diagram of the overall structure of the optical fiber displacement sensor.

[0030] Figure markings: 1. driving assembly; 10. first fixing member; 100. first through hole; 11. pushing member; 12. connecting cap; 2. sliding assembly; 20. second fixing member; 200. slide groove; 21. sliding member; 210. track groove; 211. second blind hole; 3. lifting assembly; 30. lifting member; 31. placement cavity; 310. first blind hole; 32. roller; 4. shielding member; 5. fiber optic lens assembly; 50. shell; 500. second through hole; 51. first fiber optic lens head; 52. second fiber optic lens head; 53. fifth fixing member; 6. supporting member; 7. first reset assembly; 70. third fixing member; 71. first guide member; 72. first elastic member; 8. second reset assembly; 81. fourth fixing member; 82. second elastic member; 9. machine body; 91. machine cover. DETAILED DESCRIPTION

[0031] In order to make the purpose, scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The schematic implementation manner of the present invention and its description are only used to explain the present invention and are not intended to limit the present invention.

[0032] In the following description, numerous specific details are set forth to provide a thorough understanding of the present invention. However, it will be apparent to one skilled in the art that these specific details are not necessarily required to practice the present invention. In other embodiments, well-known structures, circuits, materials, or methods are not described in detail to avoid obscuring the present invention.

[0033] Throughout this specification, references to "one embodiment," "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment of the present invention. Therefore, the phrases "one embodiment," "an embodiment," "an example," or "an example" appearing in various places throughout this specification do not necessarily refer to the same embodiment or example. In addition, the particular features, structures, or characteristics may be combined in one or more embodiments or examples in any suitable combination and / or subcombination. Furthermore, it will be understood by those of ordinary skill in the art that the figures provided herein are for illustrative purposes only and are not necessarily drawn to scale. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0034] In the description of the present invention, the terms "front", "rear", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the scope of protection of the present invention.

[0035] Example 1

[0036] like Figure 1 As shown, a fiber optic micro-displacement sensor includes a drive component 1, a sliding component 2, a lifting component 3, a shielding member 4 and a fiber optic lens component 5; the drive component 1 is connected to the sliding component 2, and the drive component 1 is used to push the sliding component 2 to slide in the first direction; the lifting component 3 is in contact with the sliding component 2, and the sliding component 2 is used to drive the lifting component 3 to move in the second direction; the stroke of the sliding component 2 in the first direction is greater than the stroke of the lifting component 3 in the second direction; the shielding member 4 is connected to the lifting component 3, and the lifting component 3 is used to drive the shielding member 4 to move in the second direction; the shielding member 4 is located on the optical path of the fiber optic lens component 5, and the shielding member 4 is used to adjust the amount of light passing through the optical path of the fiber optic lens component 5.

[0037] It should be noted that if Figure 2 As shown, the apparatus further includes a support member 6, on which the drive assembly 1, the sliding assembly 2, and the optical fiber lens assembly 5 are all disposed. In this embodiment, the support member 6 is an L-shaped support plate, which includes a vertical plate and a horizontal plate. The drive assembly 1 and the sliding assembly 2 are connected to the horizontal plate, and the optical fiber lens assembly 5 is fixed to the vertical plate.

[0038] In this embodiment, the first direction is the X-axis direction, and the second direction is the Y-axis direction. The driving component 1 generates linear motion manually or automatically, pushing the sliding component 2 in the X-axis direction. The sliding component 2 slides along the X-axis direction under the action of the driving component 1, and the lifting component 3 moves along the Y-axis direction. The vertical displacement of the lifting component 3 drives the shielding member 4 to move along the Y-axis direction. The shielding member 4 is located in the optical path of the optical fiber lens component 5. The change in the vertical displacement of the shielding member 4 causes the amount of light passing through the optical path of the optical fiber lens component 5 to change.

[0039] Among them, the stroke of the sliding component 2 in the first direction is greater than the stroke of the lifting component 3 in the second direction, which means that the larger horizontal displacement of the sliding component 2 is converted into a smaller displacement of the lifting component 3 in the Y-axis direction, thereby realizing fine adjustment of the position of the shielding member 4 and improving the resolution of the optical fiber micro-displacement sensor.

[0040] Example 2

[0041] like Figure 3 and Figure 4 As shown, the driving component 1 includes: a first fixing member 10 and a pushing member 11. The first fixing member 10 is connected to the support member 6. The sliding component 2 is located on one side of the first fixing member 10. The first fixing member 10 is provided with a first through hole 100. One end of the pushing member 11 passes through the through hole and is connected to the sliding component 2. The pushing member 11 is used to push the sliding component 2 to slide in the first direction. It can be understood that a connecting cap 12 is provided on the other end of the pushing member 11. Figure 4 As shown, the pushing member 11 is threadedly connected to the inner wall of the first through hole 100 , and one end of the pushing member 11 passing through the first through hole 100 abuts against the sliding component 2 .

[0042] The pusher 11 can be rotated through the engagement cap 12 and screwed into the first through-hole 100, thereby pushing the sliding assembly 2 in the X-axis direction. The threaded connection allows the pusher 11 to be screwed in or out of the first through-hole 100 in small increments (i.e., the pitch of the thread). This continuous and repeatable small displacement makes the pushing of the sliding assembly 2 very precise, thereby achieving precise control of the displacement of the shielding member 4 in the Y-axis direction.

[0043] The connection cap 12 is used to connect with the object to be tested, for example, it can be connected with the object whose displacement change needs to be measured. When the object to be tested changes in displacement, the connection cap 12 will move accordingly, and then drive the sliding assembly 2 to move through the pusher 11.

[0044] like Figure 3As shown, the fiber optic lens assembly 5 includes a shell 50, a first fiber optic lens head 51 and a second fiber optic lens head 52. The shell 50 is connected to the support member 6. The shell 50 is hollow. The first fiber optic lens head 51 and the second fiber optic lens head 52 are relatively arranged in the shell 50, and an optical path is formed between the first fiber optic lens head 51 and the second fiber optic lens head 52; the shielding member 4 is located between the first fiber optic lens head 51 and the second fiber optic lens head 52; a second through hole 500 is provided at the bottom of the shell 50, and part of the body of the lifting assembly 3 is passed through the second through hole 500 and is connected to the shielding member 4, and the second through hole 500 is used to limit the movement of the lifting assembly 3 along the first direction.

[0045] Among them, the first fiber optic lens head 51 and the second fiber optic lens head 52 are both lenses commonly used in the prior art and will not be described in detail here. Light enters the first fiber optic lens head 51 and then enters the second fiber optic lens head 52 from the first fiber optic lens head 51. In this way, a spatial light path is formed between the first fiber optic lens head 51 and the second fiber optic lens head 52. The shielding member 4 is initially located at a certain position on the light path between the first fiber optic lens head 51 and the second fiber optic lens head 52. This position determines the initial amount of light passing through the light path. When the position of the shielding member 4 needs to be adjusted, the driving assembly 1 starts working. Specifically, the pushing member 11 rotates through the first through hole 100 on the first fixing member 10 under the action of some external force (which can be manual rotation, motor drive, etc.).

[0046] Because the pusher 11 is threadedly connected to the inner wall of the first through-hole 100, the rotation of the pusher 11 is converted into linear motion along the X-axis. This linear motion pushes the sliding assembly 2, which is in contact with the pusher 11, to slide in the first direction. During the sliding process of the sliding assembly 2 along the X-axis, the second through-hole 500 restricts the lifting assembly 3 to move only along the Y-axis, not along the X-axis. The large displacement of the sliding assembly 2 in the X-axis is converted into a smaller displacement of the lifting assembly in the Y-axis. The vertical displacement of the lifting assembly 3 causes the shielding member 4 to move slightly in the Y-axis. This movement changes the position of the shielding member 4 in the optical path between the first fiber optic lens head 51 and the second fiber optic lens head 52, and the portion of the light beam entering through the first fiber optic lens head 51 that is blocked also changes. As a result, the amount of light received by the second fiber optic lens head 52 also changes. The fiber optic displacement sensor of the present application is connected to a demodulator, which is a common accessory or instrument and is not listed separately here. The demodulator can convert and further process the changing optical signal.

[0047] It should be noted that the object to be tested rotates the pusher 11 via the coupling cap 12. For example, if the object to be tested is a metal rod, the coupling cap 12 and the object to be tested are connected using a gear transmission. An input gear is mounted on one end of the metal rod. The output gear is installed on the coupling cap 12, ensuring that the output gear is coaxial with the pusher 11. The positions of the input and output gears are adjusted to ensure an appropriate gap between the gears. Ensure that the gears are properly meshed. Once the gears are installed, the displacement of the metal rod is converted into rotational motion of the pusher 11 via the gears.

[0048] like Figure 3 and Figure 4 As shown, the sliding assembly 2 includes a second fixing member 20 and a sliding member 21. The second fixing member 20 is arranged on the support member 6. A sliding groove 200 is provided on the top of the second fixing member 20. The sliding member 21 is slidably connected to the sliding groove 200. A track groove 210 is provided on the top of the sliding member 21. One side of the track groove 210 is higher and the other side of the track groove 210 is lower. The bottom of the lifting assembly 3 is located in the track groove 210. When the track groove 210 moves along the first direction, it drives the lifting member to move along the second direction. Figure 4 One side of the track groove 210 is higher and the other side of the track groove 210 is lower, which means that the track groove 210 is sloped.

[0049] The second fixing member 20 of the sliding assembly 2 is firmly mounted on the supporting member 6 , and the sliding groove 200 on the top thereof provides a horizontal sliding track for the sliding member 21 .

[0050] like Figure 5 、 Figure 6 and Figure 7 As shown, the lifting assembly 3 includes a lifting member 30 and a roller 32. The bottom of the lifting member 30 is rotatably connected to the roller 32, and the roller 32 abuts the track groove 210. The top of the lifting member 30 is provided with a second through hole 500 and is connected to the shielding member 4. The bottom of the housing 50 is also fixedly connected to a fifth fixing member 53. The fifth fixing member 53 is provided with a third through hole. The center of the third through hole and the second through hole are aligned on the same axis. The top of the lifting member 30 is provided with the third through hole and is connected to the shielding member 4. The fifth fixing member 53 increases the limiting area of the lifting member 30, which can better prevent the lifting member 30 from moving in the X-axis direction.

[0051] A placement cavity 31 is provided on the lifting member 30, and the shielding member 4 is located in the placement cavity 31. Both sides of the placement cavity 31 are set as openings. The openings on both sides of the placement cavity 31 are used for the passage of spatial light paths. A first blind hole 310 is provided at the bottom of the placement cavity 31, and the bottom of the shielding member 4 is connected to the first blind hole 310.

[0052] The rotation of the pusher 11 is converted into linear motion along the X-axis. This linear motion pushes the sliding assembly 2 in contact with the pusher 11 to slide along the X-axis. As the sliding member 21 moves horizontally, the track groove 210 on its top also moves accordingly. Due to the inclined design of the track groove 210 and the second through hole 500, the lifting member 30 can only move along the vertical Y-axis direction, but not along the horizontal X-axis direction. The movement of the track groove 210 forces the roller to drive the lifting member 3 to rise along the Y-axis direction. In this way, the displacement in the X-axis direction is effectively converted into displacement in the Y-axis direction, and the conversion ratio is determined by the inclination angle of the track groove.

[0053] For example, if the inclination angle of the track groove 210 is less than 45°, the horizontal displacement of the test piece will be converted into a smaller vertical displacement of the shielding piece.

[0054] like Figure 6 As shown, the size of the shielding member 4 gradually decreases or increases along the second direction. For reference, the shielding member 4 can be Figure 6 The needle shown in FIG has its bottom fixed in a first blind hole 310 at the bottom of the placement cavity 31. Since the needle is thinner at the top and thicker at the bottom, when the needle moves upward, the area it blocks light increases, allowing less light to pass through; conversely, when the needle moves downward, the area it blocks light decreases, allowing more light to pass through.

[0055] like Figure 8 As shown, in a possible embodiment, it further includes a first reset component 7, which is connected to the sliding member 21. The first reset component 7 includes a third fixing member 70, a first guide member 71 and a first elastic member 72. The third fixing member 70 is connected to the support member 6, and the third fixing member 70 is arranged opposite to the first fixing member 10. One end of the first guide member 71 is connected to the third fixing member 70.

[0056] like Figure 9 As shown, a second blind hole 211 is defined at one end of the sliding member 21 , and the other end of the first guide member 71 is located in the second blind hole 211 .

[0057] like Figure 9 and Figure 10 As shown, the length of the first guide member 71 is less than the depth of the second blind hole 211, the first elastic member 72 is sleeved on the first guide member 71, one end of the first elastic member 72 is connected to the third fixing member 70, and the other end of the first elastic member 72 is connected to the inner wall of the second blind hole 211.

[0058] The sliding member 21 is in its initial position. At this time, the first elastic member 72 (such as a spring) is in a natural state and is not compressed or stretched. One end of the first guide member 71 is fixed on the third fixing member 70, and the other end extends into the second blind hole 211 of the sliding member 21, but does not touch the inner wall of the second blind hole 211. When the pushing member 11 is screwed into the first through hole, the pushing member 11 pushes the first sliding member 21 toward the first guide member 71, and the first elastic member 72 is compressed. As the contact point position of the track groove and the roller gradually increases, the lifting member rises and drives the shielding member to rise. When the pushing member 11 is screwed out of the first through hole, the first elastic member 72 pushes the sliding member 21 to move in a direction opposite to the original moving direction, that is, the sliding member 21 is reset. The contact point position of the track groove and the roller gradually decreases. Under the action of gravity, the lifting member descends and drives the shielding member to descend and reset.

[0059] In one possible implementation, Figure 11 As shown, it also includes a second reset component 8, the second reset component 8 is connected to the lifting member 30, the second reset component 8 includes a fourth fixing member 81 and a second elastic member 82, one end of the fourth fixing member 81 is connected to the inner wall of the housing 50, and the other end of the fourth fixing member 81 is slidably connected to the lifting member 30, as shown. Figure 11 As shown, one end of the fourth fixing member 81 connected to the lifting member 30 is provided with a sliding groove, as shown in FIG. Figure 7 The top side wall of the lifting member 30 is provided with a sliding rod, which can move up and down in the sliding groove.

[0060] The fourth fixing member 81 is hollow inside, the second elastic member 82 is located inside the fourth fixing member 81, one end of the second elastic member 82 is connected to the top inner wall of the fourth fixing member 81, and the other end of the second elastic member 82 is connected to the top of the lifting member 30.

[0061] When the first guide member 71 is in its initial position, the first elastic member 72 (such as a spring) is in a natural state and is not compressed or stretched. One end of the first guide member 71 is fixed on the third fixing member 70, and the other end extends into the second blind hole 211 of the sliding member 21, but does not touch the inner wall of the second blind hole 211. When the pushing member 11 is screwed into the first through hole, the pushing member 11 pushes the first sliding member 21 toward the first guide member 71, and the first elastic member 72 is compressed. As the contact point position between the track groove and the roller gradually increases, the lifting member rises and drives the shielding member to rise, and the second elastic member 81 is compressed. When the pushing member 11 is screwed out of the first through hole, the first elastic member 72 pushes the sliding member 21 to move in the direction opposite to the original moving direction, that is, the sliding member 21 is reset. The contact point position between the track groove and the roller gradually decreases. Under the action of the second elastic member 81, the lifting member is pushed down, and the lifting member descends and drives the shielding member to descend and reset.

[0062] like Figure 12 As shown, it also includes a machine body 9 and a machine cover 91. The machine body 9 surrounds the support member 6 inside, and the machine cover 91 can be connected to the machine body 9 through threads.

[0063] The above-described embodiments merely represent specific implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the scope of the present invention, all of which fall within the scope of protection of the present invention.

Claims

1. An optical fiber micro-displacement sensor, characterized in that: It comprises a driving assembly (1), a sliding assembly (2), a lifting assembly (3), a shielding member (4) and a fiber optic lens assembly (5); The driving component (1) is connected to the sliding component (2), and the driving component (1) is used to push the sliding component (2) to slide in a first direction; The lifting assembly (3) abuts against the sliding assembly (2), and the sliding assembly (2) is used to drive the lifting assembly (3) to move in the second direction; the travel of the sliding assembly (2) in the first direction is greater than the travel of the lifting assembly (3) in the second direction; The shielding member (4) is connected to the lifting assembly (3), and the lifting assembly (3) is used to drive the shielding member (4) to move in the second direction; The shielding member (4) is located on the optical path of the optical fiber lens assembly (5), and the shielding member (4) is used to adjust the amount of light passing through the optical path of the optical fiber lens assembly (5).

2. The optical fiber micro-displacement sensor according to claim 1, characterized in that: It also includes a support member (6), on which the drive assembly (1), the sliding assembly (2), and the optical fiber lens assembly (5) are all arranged.

3. The optical fiber micro-displacement sensor according to claim 2, characterized in that: The driving component (1) comprises: a first fixing member (10) and a pushing member (11), the first fixing member (10) is connected to the supporting member (6), the sliding component (2) is located on one side of the first fixing member (10), a first through hole (100) is provided on the first fixing member (10), one end of the pushing member (11) passes through the through hole and is connected to the sliding component (2), and the pushing member (11) is used to push the sliding component (2) to slide in a first direction.

4. The optical fiber micro-displacement sensor according to claim 3, characterized in that: The pushing member (11) is threadedly connected to the inner wall of the first through hole (100), and one end of the pushing member (11) passing through the first through hole (100) abuts against the sliding component (2).

5. The optical fiber micro-displacement sensor according to claim 3, characterized in that: The optical fiber lens assembly (5) comprises a housing (50), a first optical fiber lens head (51) and a second optical fiber lens head (52); the housing (50) is connected to the support member (6); the housing (50) is hollow; the first optical fiber lens head (51) and the second optical fiber lens head (52) are arranged relative to each other in the housing (50); a spatial optical path is formed between the first optical fiber lens head (51) and the second optical fiber lens head (52); the shielding member (4) is located between the first optical fiber lens head (51) and the second optical fiber lens head (52); A second through hole (500) is provided at the bottom of the shell (50), and a portion of the body of the lifting component (3) passes through the second through hole (500) and is connected to the shielding member (4), and the second through hole (500) is used to limit the movement of the lifting component (3) along the first direction.

6. The optical fiber micro-displacement sensor according to claim 5, characterized in that: The sliding assembly (2) includes a second fixing member (20) and a sliding member (21), wherein the second fixing member (20) is arranged on the supporting member (6), a sliding groove (200) is provided on the top of the second fixing member (20), and the sliding member (21) is slidably connected to the sliding groove (200), and a track groove (210) is provided on the top of the sliding member (21), one side of the track groove (210) is higher, and the other side of the track groove (210) is lower, and the bottom of the lifting assembly (3) is located in the track groove (210), and when the track groove (210) moves along the first direction, it drives the lifting assembly (3) to move along the second direction.

7. The optical fiber micro-displacement sensor according to claim 6, characterized in that: The lifting assembly (3) comprises a lifting member (30) and a roller (32), the bottom of the lifting member (30) is rotatably connected to the roller (32), the roller (32) abuts against the track groove (210), and the top of the lifting member (30) is provided with the second through hole (500) and is connected to the shielding member (4); A placement cavity (31) is provided on the lifting member (30), the shielding member (4) is located in the placement cavity (31), both sides of the placement cavity (31) are arranged as openings, the openings on both sides of the placement cavity (31) are used for light paths to pass through, a first blind hole (310) is provided at the bottom of the placement cavity (31), and the bottom of the shielding member (4) is connected to the first blind hole (310).

8. The optical fiber micro-displacement sensor according to claim 1, characterized in that: The size of the shielding member (4) gradually decreases or increases along the second direction.

9. The optical fiber micro-displacement sensor according to claim 6, characterized in that: The invention also includes a first reset component (7), the first reset component (7) is connected to the sliding member (21), the first reset component (7) includes a third fixing member (70), a first guide member (71) and a first elastic member (72), the third fixing member (70) is connected to the support member (6), the third fixing member (70) is arranged opposite to the first fixing member (10), one end of the first guide member (71) is connected to the third fixing member (70), one end of the sliding member (21) is provided with a second blind hole (211), the other end of the first guide member (71) is located in the second blind hole (211), the length of the first guide member (71) is less than the depth of the second blind hole (211), the first elastic member (72) is sleeved on the first guide member (71), one end of the first elastic member (72) is connected to the third fixing member (70), and the other end of the first elastic member (72) is connected to the inner wall of the second blind hole (211).

10. The optical fiber micro-displacement sensor according to claim 7, characterized in that: The invention also includes a second reset component (8), the second reset component (8) is connected to the lifting component (30), and the second reset component (8) includes a fourth fixing component (81) and a second elastic component (82), one end of the fourth fixing component (81) is connected to the inner wall of the shell (50), and the other end of the fourth fixing component (81) is slidably connected to the lifting component (30), the fourth fixing component (81) is hollow inside, the second elastic component (82) is located in the fourth fixing component (81), one end of the second elastic component (82) is connected to the top inner wall of the fourth fixing component (81), and the other end of the second elastic component (82) is connected to the top of the lifting component (30).

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