Monolithic optical fiber acceleration sensor

Abstract

The application relates to the technical field of optical fiber sensing, and discloses a single-structure optical fiber acceleration sensor. The optical fiber acceleration sensor comprises a mass block, an optical fiber, a reflector and a coupler, the mass block is provided with a first mounting groove, a second mounting groove and a plurality of separation grooves, the plurality of separation grooves separate the mass block into an outer frame and a vibrating block, the optical fiber comprises a first optical fiber and a second optical fiber, the first optical fiber and the second optical fiber are respectively arranged in the first mounting groove and the second mounting groove, and left ends of the first optical fiber and the second optical fiber are connected to the coupler, and right ends of the first optical fiber and the second optical fiber are respectively connected to the reflector. The single-structure optical fiber acceleration sensor has the advantages that the separation grooves separate the mass block into the integrated outer frame and the vibrating block, the overall structure is simplified, and the overall volume is reduced; and the mass block is sensitive to an excitation signal in only one direction, and excitation responses in the other two directions are very small, so that the sensitivity of the sensor is improved.

Description

TECHNICAL FIELD

[0001] The embodiment of the present application relates to the technical field of optical fiber sensing, in particular to a single-structure optical fiber acceleration sensor. BACKGROUND

[0002] With the vigorous development of science and technology industry, vibration measurement becomes more and more important. In various aspects such as aerospace guidance system, seismic detection system of oil exploration, health monitoring system of large structures such as buildings and ships, high-performance and high-reliability vibration sensors are needed.

[0003] Compared with traditional electrical acceleration sensors, optical fiber acceleration sensors have advantages of anti-electromagnetic interference, high sensitivity, large dynamic range, easy multiplexing, etc., so that they are widely used in various harsh environments, and are favored by researchers in recent years.

[0004] The present application inventors find that the existing optical fiber acceleration sensors have a composite structure of a weight and an elastic beam, and the sensitivity is improved by increasing the weight, which leads to a large design volume and is difficult to adapt to some miniaturized special application occasions; more importantly, the composite structure brings large transverse crosstalk, which has a great negative impact on the vibration test results. SUMMARY

[0005] The purpose of the present application is to provide a single-structure optical fiber acceleration sensor to solve the problems in the background.

[0006] The embodiment of the present application provides a single-structure optical fiber acceleration sensor, which comprises a mass block, an optical fiber, a mirror and a coupler.

[0007] The mass block is in the shape of a cuboid;

[0008] The left side of the mass block is provided with a first mounting groove, and the right side is provided with a second mounting groove;

[0009] The mass block is provided with a plurality of separation grooves, and the plurality of separation grooves are used to separate the mass block into an outer frame and a vibration block;

[0010] The optical fiber comprises a first optical fiber and a second optical fiber;

[0011] The first optical fiber is arranged in the first mounting groove, and the top end of the first optical fiber abuts against the vibration block, and the bottom end abuts against the outer frame;

[0012] The second optical fiber is arranged in the second mounting groove, and the top end of the second optical fiber abuts against the outer frame, and the bottom end abuts against the vibration block;

[0013] The left ends of the first and second optical fibers are connected to the coupler, and the right ends are connected to the mirrors respectively.

[0014] According to the above scheme, the monomer structure optical fiber acceleration sensor is characterized in that the mass block is provided with a first mounting groove, a second mounting groove and a plurality of separation grooves, the plurality of separation grooves separate the mass block into an outer frame and a vibrating block, the optical fiber comprises a first optical fiber and a second optical fiber, the first optical fiber and the second optical fiber are arranged in the first mounting groove and the second mounting groove of the mass block respectively, the left ends are connected to the coupler, and the right ends are connected to the mirrors respectively.

[0015] In a feasible scheme, the separation grooves comprise a first left separation groove, a second left separation groove, a third left separation groove, a fourth left separation groove, a first right separation groove, a second right separation groove, a third right separation groove and a fourth right separation groove.

[0016] The first left separation groove and the second left separation groove are C-shaped and are arranged on the left side of the mass block at intervals, the third left separation groove is arranged between the first left separation groove and the second left separation groove and extends to the first mounting groove, and the fourth left separation groove is arranged between the first left separation groove and the second left separation groove and extends to the second mounting groove.

[0017] The first right separation groove and the second right separation groove are C-shaped and are arranged on the right side of the mass block at intervals, the third right separation groove is arranged between the first right separation groove and the second right separation groove and extends to the first mounting groove, and the fourth right separation groove is arranged between the first right separation groove and the second right separation groove and extends to the second mounting groove.

[0018] In a feasible scheme, the first left separation groove and the second left separation groove are arranged in mirror symmetry with the first right separation groove and the second right separation groove respectively.

[0019] In a feasible scheme, the fourth left separation groove and the third right separation groove are Z-shaped.

[0020] In a feasible scheme, the top surface and the bottom surface of the first mounting groove and the second mounting groove are circular arc-shaped.

[0021] In a feasible scheme, the mass block is provided with a baffle at the first mounting groove and the second mounting groove.

[0022] In an embodiment, the sidewall of the mass is provided with a process hole.

[0023] In an embodiment, the partition groove is made by wire cutting.

[0024] In an embodiment, the mass is made of stainless steel. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings described below are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0026] Figure 1 FIG. 1 is a schematic diagram of a single structure optical fiber acceleration sensor in an embodiment of the present application;

[0027] Figure 2 FIG. 2 is a schematic diagram of a mass in an embodiment of the present application;

[0028] Figure 3 FIG. 3 is another angle schematic diagram of the mass in an embodiment of the present application.

[0029] REFERENCE NUMERALS IN DRAWINGS

[0030] 1, mass; 1001, baffle; 101, first mounting groove; 102, second mounting groove; 1031, first left partition groove; 1032, second left partition groove; 1033, third left partition groove; 1034, fourth left partition groove; 1035, first right partition groove; 1036, second right partition groove; 1037, third right partition groove; 1038, fourth right partition groove; 104, process hole; 11, outer frame; 12, vibration block; 2, optical fiber; 21, first optical fiber; 22, second optical fiber; 3, mirror; 4, coupler. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0032] In the description of the present application, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like are based on the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0033] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, can also be integrated; can be mechanical connection, can also be electrical connection, can also be communication connection; can be direct connection, can also be indirect connection through intermediate medium, can be the communication or interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0034] The technical solutions of the present application will be described in detail below with specific examples. The following specific examples can be combined with each other, and the same or similar concepts or processes can not be described in some examples.

[0035] Figure 1 A schematic diagram of a monolithic structure optical fiber acceleration sensor in an embodiment of the present application, Figure 2 A schematic diagram of a mass block in an embodiment of the present application, Figure 3 Another angle schematic diagram of a mass block in an embodiment of the present application. As Figures 1 to 3 shown, the monolithic structure optical fiber acceleration sensor of the present embodiment comprises a mass block 1, an optical fiber 2, a mirror 3 and a coupler 4.

[0036] The mass block 1 is in the shape of a cuboid.

[0037] The left side of the mass block 1 is provided with a first mounting groove 101 in the vertical direction, and the right side of the mass block 1 is provided with a second mounting groove 102 in the vertical direction. The first mounting groove 101 and the second mounting groove 102 are both located at the middle position of the mass block 1, and the first mounting groove 101 and the second mounting groove 102 are spaced apart by a certain distance in the vertical direction.

[0038] The inside of the mass block 1 is provided with a plurality of partition grooves, and the plurality of partition grooves on the mass block 1 do not intersect. The partition grooves on the mass block 1 divide the mass block 1 into an outer frame 11 outside and a vibration block 12 (elastic body) inside. Of course, the outer frame 11 and the vibration block 12 after partitioning are in an integrated structure.

[0039] The optical fiber 2 is provided with two, including: the first optical fiber 21 and the second optical fiber 22.

[0040] The first optical fiber 21 is wound in the first mounting slot 101 of the mass block 1, and when the first optical fiber 21 is wound, the top end of the first optical fiber 21 abuts on the vibrating block 12 of the mass block 1, and the bottom end of the first optical fiber 21 abuts on the outer frame 11 of the mass block 1.

[0041] The second optical fiber 22 is wound in the second mounting slot 102 of the mass block 1, and when the second optical fiber 22 is wound, the top end of the second optical fiber 22 abuts on the outer frame 11 of the mass block 1, and the bottom end of the second optical fiber 22 abuts on the vibrating block 12 of the mass block 1.

[0042] The left end of the first optical fiber 21 and the second optical fiber 22 extends out of the mass block 1 and is connected to the coupler 4, and the right end of the first optical fiber 21 and the second optical fiber 22 extends out of the mass block 1 and is connected to the two reflecting mirrors 3 respectively.

[0043] It can be found from the above that the single-structure optical fiber acceleration sensor of the embodiment is provided with a mass block, an optical fiber, a reflecting mirror and a coupler, the mass block is provided with a first mounting slot, a second mounting slot and a plurality of separation slots, the plurality of separation slots separates the mass block into an outer frame and a vibrating block, the optical fiber includes a first optical fiber and a second optical fiber, the first optical fiber and the second optical fiber are wound in the first mounting slot and the second mounting slot of the mass block respectively, the left end is connected to the coupler, and the right end is connected to the reflecting mirror respectively. The single-structure optical fiber acceleration sensor of the embodiment separates the mass block into an integrated outer frame and vibrating block through the separation slots, simplifies the overall structure and reduces the overall volume; and the mass block is sensitive to excitation signals in only one direction, and the excitation response in the remaining two directions is small, thereby improving the sensitivity of the sensor.

[0044] Optionally, as shown in Figure 2 、 Figure 3 The separation slots of the single-structure optical fiber acceleration sensor of the embodiment include a first left separation slot 1031, a second left separation slot 1032, a third left separation slot 1033, a fourth left separation slot 1034, a first right separation slot 1035, a second right separation slot 1036, a third right separation slot 1037 and a fourth right separation slot 1038.

[0045] The first left partition groove 1031 and the second left partition groove 1032 are C-shaped and are arranged at intervals on the left side of the mass 1. The third left partition groove 1033 is horizontally arranged on the upper left side of the mass 1, the left side of the third left partition groove 1033 is located between the first left partition groove 1031 and the second left partition groove 1032, and the right side of the third left partition groove 1033 extends to the first mounting groove 101 to form an opening on the side wall of the first mounting groove 101. The fourth left partition groove 1034 is arranged on the lower left side of the mass 1, the left side of the fourth left partition groove 1034 is located between the first left partition groove 1031 and the second left partition groove 1032, and the right side of the fourth left partition groove 1034 extends to the second mounting groove 102 to form an opening on the side wall of the second mounting groove 102.

[0046] The first right partition groove 1035 and the second right partition groove 1036 are C-shaped and are arranged at intervals on the right side of the mass 1. The third right partition groove 1037 is arranged on the upper right side of the mass 1, the right side of the third right partition groove 1037 is located between the first right partition groove 1035 and the second right partition groove 1036, and the left side of the third right partition groove 1037 extends to the first mounting groove 101 to form an opening on the side wall of the first mounting groove 101. The fourth right partition groove 1038 is horizontally arranged on the lower right side of the mass 1, the right side of the fourth right partition groove 1038 is located between the first right partition groove 1035 and the second right partition groove 1036, and the left side of the fourth right partition groove 1038 extends to the second mounting groove 102 to form an opening on the side wall of the second mounting groove 102.

[0047] Further, in the single-structure optical fiber acceleration sensor in the embodiment, the first left partition groove 1031 and the first right partition groove 1035 are arranged in left-right mirror symmetry on the mass 1, and the second left partition groove 1032 and the second right partition groove 1036 are arranged in left-right mirror symmetry on the mass 1.

[0048] Further, in the single-structure optical fiber acceleration sensor in the embodiment, the fourth left partition groove 1034 is Z-shaped, the left side (bottom) of the fourth left partition groove 1034 extends between the first left partition groove 1031 and the second left partition groove 1032, and the right side (top) of the fourth left partition groove 1034 extends into the second mounting groove 102 to form an opening on the side wall of the second mounting groove 102.

[0049] The third right partition groove 1037 is Z-shaped, the left side (bottom) of the third right partition groove 1037 extends into the first mounting groove 101 to form an opening on the side wall of the first mounting groove 101, and the right side (top) of the third right partition groove 1037 extends between the first right partition groove 1035 and the second right partition groove 1036.

[0050] Optionally, the top surface and the bottom surface of the first mounting groove 101 and the second mounting groove 102 on the mass block 1 in the monomer structure optical fiber acceleration sensor of the embodiment are smooth circular arc-shaped to prevent damage to the optical fiber.

[0051] Further, the mass block 1 is provided with a baffle 1001 on the side surface of the first mounting groove 101 and the second mounting groove 102 in the monomer structure optical fiber acceleration sensor of the embodiment to prevent the optical fiber 2 from sliding out of the mounting groove of the mass block 1.

[0052] Optionally, the mass block 1 is provided with a process hole 104 on the left and right side walls in the monomer structure optical fiber acceleration sensor of the embodiment.

[0053] The mass block 1 is rotatably fixed through the process hole 104 when the optical fiber 2 is wound on the mass block 1, facilitating the winding of the optical fiber 2.

[0054] Optionally, all the separation grooves on the mass block 1 in the monomer structure optical fiber acceleration sensor of the embodiment are cut by a wire cutting method, facilitating the processing of the separation grooves.

[0055] Further, the mass block 1 is made of 316L stainless steel in the monomer structure optical fiber acceleration sensor of the embodiment.

[0056] The working principle of the monomer structure optical fiber acceleration sensor of the embodiment is as follows:

[0057] When the outer frame of the mass block moves with an upward acceleration, the vibration block will be subjected to an inertial force opposite to the direction of motion, so that the optical fiber wound on the left side of the mass block is stretched, and the optical fiber wound on the right side is compressed, forming a push-pull structure. In this way, the length of the optical fiber wound on the mass block will change, that is, the optical fiber on the left side is lengthened, and the optical fiber on the right side is shortened, thereby causing the propagation path of light in the two optical fibers to be different, so that the two beams of light produce a phase difference, and the phase difference is converted into a change in light intensity output. The interference light signal after output is detected by a photodetector, and the light signal is converted into an electrical signal to be provided to a signal processing circuit, so as to obtain the acceleration signal to be measured.

[0058] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first feature and the second feature, or indirect contact between the first feature and the second feature through an intermediate medium.

[0059] Also, a first feature being "on", "above", and "over" a second feature can mean that the first feature is directly on, above, and over the second feature or that there is an intervening feature between the first feature and the second feature. A first feature being "under", "below", and "underneath" a second feature can mean that the first feature is directly under, below, and underneath the second feature or that there is an intervening feature between the first feature and the second feature.

[0060] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are contained in at least one embodiment or example of the application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Also, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in one or more embodiments or examples. In addition, the skilled person in the art can combine and combine the features of different embodiments or examples and different embodiments or examples described in the specification without contradiction.

[0061] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A monolithic optical fiber acceleration sensor, characterized by, The single-body optical fiber acceleration sensor comprises a mass block, an optical fiber, a mirror and a coupler. The mass block is cuboid-shaped. The left side of the mass block is provided with a first mounting groove, and the right side is provided with a second mounting groove. The mass block is provided with a plurality of separation grooves for separating the mass block into an outer frame and a vibration block. The outer frame and the vibration block after separation are in an integrated structure. The optical fiber comprises a first optical fiber and a second optical fiber. The first optical fiber is wound in the first mounting groove, and the top end of the first optical fiber is abutted on the vibration block, and the bottom end is abutted on the outer frame. The second optical fiber is wound in the second mounting groove, and the top end of the second optical fiber is abutted on the outer frame, and the bottom end is abutted on the vibration block. The left ends of the first optical fiber and the second optical fiber are connected to the coupler, and the right ends are respectively connected to the mirror. The separation grooves comprise a first left separation groove, a second left separation groove, a third left separation groove, a fourth left separation groove, a first right separation groove, a second right separation groove, a third right separation groove and a fourth right separation groove. The first left separation groove and the second left separation groove are C-shaped and are arranged at intervals on the left side of the mass block. The third left separation groove is arranged between the first left separation groove and the second left separation groove and extends to the first mounting groove.

2. The monolithic structure optical fiber acceleration sensor of claim 1, wherein, The fourth left separation groove is arranged between the first left separation groove and the second left separation groove and extends to the second mounting groove. The first right separation groove and the second right separation groove are C-shaped and are arranged at intervals on the right side of the mass block. The third right separation groove is arranged between the first right separation groove and the second right separation groove and extends to the first mounting groove. The fourth right separation groove is arranged between the first right separation groove and the second right separation groove and extends to the second mounting groove. The first left separation groove and the second left separation groove are arranged in mirror symmetry with the first right separation groove and the second right separation groove respectively. The fourth left separation groove and the third right separation groove are Z-shaped. The top surface and the bottom surface of the first mounting groove and the second mounting groove are circularly arc-shaped. The mass block is provided with a baffle at the first mounting groove and the second mounting groove. The sidewall of the mass block is provided with a process hole. The separation grooves are made by wire cutting.

3. The monolithic structure optical fiber acceleration sensor of claim 2, wherein, 9. The single-body optical fiber acceleration sensor according to any one of claims 1 to 8, wherein the mass block is made of stainless steel. ​ 4. The monolithic structure optical fiber acceleration sensor of claim 3, wherein, ​ ​ 5. The monolithic structure fiber optic acceleration sensor of claim 1, wherein, ​ ​ 6. The monolithic structure optical fiber acceleration sensor of claim 5, wherein, ​ ​ 7. The monolithic structure fiber optic acceleration sensor of claim 1, wherein, ​ ​ 8. The monolithic structure fiber optic acceleration sensor of claim 1, wherein, ​ ​ ​ ​

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