Miniaturized airborne optical fiber acceleration sensor

Abstract

The utility model relates to an acceleration sensor, in particular to a miniaturized airborne optical fiber acceleration sensor, and belongs to the field of optical fiber grating sensors and the field of aerospace detection. The utility model provides a miniaturized airborne optical fiber acceleration sensor, comprising a main body, the top of which is provided with a first mounting groove along the length direction; the fixing assembly is separably arranged in the first mounting groove; and the optical fiber assembly is arranged on the fixing assembly and penetrates out of the two ends of the main body. The utility model mainly aims to provide a miniaturized airborne optical fiber acceleration sensor, and solves the technical problem that the existing acceleration sensor based on the fiber grating sensing technology is large in size and weight.

Description

Technical Field

[0001] The utility model relates to an acceleration sensor, in particular to a miniaturized airborne optical fiber acceleration sensor, belonging to the field of optical fiber grating sensors and aerospace detection. Background Art

[0002] As we all know, military aircraft have very strict restrictions on the weight and volume of their equipment and systems, and structural health monitoring equipment using fiber Bragg grating technology has become an important means of PHM systems for military aircraft. The design and production of miniaturized sensors and equipment that are suitable for military aircraft engineering applications has become a problem that must be solved. However, the current acceleration sensors based on fiber Bragg grating sensing technology are generally large in size and weight, which cannot meet the needs of military aircraft. Utility Model Content

[0003] The main purpose of the utility model is to provide a miniaturized airborne optical fiber acceleration sensor, which solves the technical problems of large volume and weight of the existing acceleration sensors based on the optical fiber grating sensing technology.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a miniaturized airborne optical fiber acceleration sensor, comprising:

[0005] The main body has a first mounting groove formed on the top along the length direction thereof;

[0006] A fixing assembly is detachably disposed in the first mounting groove;

[0007] The optical fiber assembly is arranged on the fixed assembly, and the optical fiber assembly passes through two ends of the main body;

[0008] The cover plate is fixedly arranged on the top of the main body.

[0009] Preferably, a second mounting groove is provided on the top of the fixing component along its length direction, a through groove is provided on the side of the fixing component along its width direction, the through groove has an opening that passes through the top of the fixing component, the opening and the second mounting groove are used to install the optical fiber component, and the fixing component and the main body are connected by screws.

[0010] Preferably, the optical fiber assembly comprises:

[0011] The high-strength optical fiber is arranged in the second installation groove, and both ends of the second installation groove are fixedly connected to the high-strength optical fiber;

[0012] A femtosecond fiber grating is fixedly connected to the high-strength optical fiber and is arranged in the opening.

[0013] Preferably, two sides of the bottom of the main body are symmetrically fixedly connected with mounting plates, and a plurality of through holes are formed on the mounting plates.

[0014] Preferably, both ends of the first installation groove are provided with exit grooves, the high-strength optical fiber is fixed in the exit groove by a fixing structure, the fixing structure is inserted in the exit groove, and the high-strength optical fiber is fixed in the fixing structure.

[0015] Preferably, the material of the main body and the cover plate is aviation aluminum.

[0016] Preferably, the material of the fixing component is Invar.

[0017] The beneficial effects achieved by the utility model are:

[0018] The utility model reduces the volume and weight of the optical fiber acceleration sensor by optimizing the structure of the optical fiber acceleration sensor, and has good stress distribution characteristics and good frequency response characteristics, can meet the detection of 0-100HZ low-frequency signals, and meets the use requirements of military aircraft.

[0019] The fixed component is made of invar, which has a thermal expansion coefficient close to that of quartz optical fiber, reducing the impact of ambient temperature changes on sensor test performance.

[0020] The stress distribution characteristics and frequency response characteristic curve of the fixed component simulated and calculated using the comsol software have a resonance peak located at around 360 Hz. The utility model has a flat frequency response in the range of 0 to 100 Hz and is suitable for vibration acceleration measurement in the frequency range of 0 to 100 Hz. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0022] Figure 1 It is a schematic diagram of a miniaturized airborne optical fiber acceleration sensor disclosed in a specific embodiment of the utility model;

[0023] Figure 2 It is an exploded diagram of a miniaturized airborne optical fiber acceleration sensor disclosed in a specific embodiment of the utility model;

[0024] Figure 3 This is another schematic diagram of a miniaturized airborne optical fiber acceleration sensor disclosed in a specific embodiment of the utility model (the cover plate is hidden);

[0025] Figure 4 It is a stress simulation schematic diagram of a miniaturized airborne optical fiber acceleration sensor disclosed in a specific embodiment of the utility model;

[0026] Figure 5 It is a simulation diagram of an acceleration frequency response curve of a miniaturized airborne optical fiber acceleration sensor disclosed in a specific embodiment of the utility model.

[0027] Description of reference numerals:

[0028] 1. Main body; 11. First mounting groove; 12. Exit groove; 13. Through hole; 2. Fixing assembly; 21. Second mounting groove; 22. Through groove; 23. Opening; 3. Fixing structure; 4. Cover plate; 5. High-strength optical fiber; 6. Femtosecond fiber grating. DETAILED DESCRIPTION

[0029] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention can also be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0030] like Figure 1-Figure 3 As shown, the utility model discloses a miniaturized airborne fiber optic acceleration sensor, comprising a main body 1, a fixing assembly 2 and a fiber optic assembly. The main body 1 is a mounting and fixing device, and a mounting plate is symmetrically fixedly connected to both sides of the bottom of the main body 1. The mounting plate is provided with a plurality of through holes 13. When in use, screws are inserted into the through holes 13, and the main body 1 is connected to a monitoring structure (not shown in the figure) by screws. The material of the main body 1 is aviation aluminum.

[0031] Please refer to Figure 2 and Figure 3 A first mounting groove 11 is formed on the top of the main body 1 along its length direction, and two opposite side walls of the main body 1 are formed with outlet grooves 12 , in which a fixing structure 3 is inserted.

[0032] The fixing component 2 is detachably arranged in the first mounting groove 11. As an embodiment, the fixing component 2 is made of Invar steel and has vertical screw holes. When in use, the fixing component 2 is fixed in the first mounting groove 11 by screws. The top of the fixing component 2 has a second mounting groove 21 along its length direction, and the side of the fixing component 2 has a through groove 22 along its width direction. Figure 3 As shown, an opening 23 penetrating the fixing assembly 2 is formed at the top of the through slot 22 , and the opening 23 is tangent to a side wall of the through slot 22 . The opening 23 and the second installation slot 21 are both used for installing the optical fiber assembly.

[0033] Please refer to Figure 3The optical fiber assembly includes a high-strength optical fiber 5 and a femtosecond optical fiber grating 6. The left end of the high-strength optical fiber 5 passes through the fixed structure 3 on the left and is fixed in the outlet groove 12 on the left through the fixed structure 3. The high-strength optical fiber 5 enters the main body 1. Then the high-strength optical fiber 5 is arranged in the second mounting groove 21. The left and right ends of the second mounting groove 21 are provided with adhesives. The adhesive fixes the high-strength optical fiber 5 in the second mounting groove 21. The middle part of the high-strength optical fiber 5 is fixedly connected with a femtosecond optical fiber grating 6. The femtosecond optical fiber grating 6 is arranged at the opening 23. Then the right end of the high-strength optical fiber 5 passes through the outlet groove 12 on the right and is fixed in the outlet groove 12 on the right by the fixed structure 3 on the right.

[0034] like Figure 1 , Figure 2 As shown, a cover plate 4 is provided on the top of the main body 1, and the cover plate 4 separates the inner side and the outer side of the first installation groove 11, so as to protect the internal structure, and the cover plate 4 is fixedly connected with the cover plate 4 by interference fit or bonding.

[0035] When in use, the main body 1 is fixed to the detection structure with screws, and the cover plate 4 is put on.

[0036] Obviously, the described embodiments are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

Claims

1. A miniaturized airborne optical fiber acceleration sensor, characterized in that: include: The main body (1) has a first mounting groove (11) formed on its top along its length direction; A fixing assembly (2) detachably disposed in the first mounting groove (11); The top of the fixing component (2) is provided with a second installation groove (21) along its length direction, the side of the fixing component (2) is provided with a through groove (22) along its width direction, the through groove (22) is provided with an opening (23) penetrating the top of the fixing component (2), the opening (23) and the second installation groove (21) are used for installing an optical fiber component, and the fixing component (2) and the main body (1) are connected by screws; An optical fiber assembly is arranged on the fixing assembly (2), and the optical fiber assembly passes through two ends of the main body (1); A cover plate (4) is fixedly arranged on the top of the main body (1).

2. A miniaturized airborne optical fiber acceleration sensor according to claim 1, characterized in that: The optical fiber assembly comprises: A high-strength optical fiber (5) is arranged in the second installation groove (21), and both ends of the second installation groove (21) are fixedly connected to the high-strength optical fiber (5); A femtosecond fiber grating (6) is fixedly connected to the high-strength optical fiber (5), and the femtosecond fiber grating (6) is arranged in the opening (23).

3. A miniaturized airborne optical fiber acceleration sensor according to claim 1, characterized in that: The bottom sides of the main body (1) are symmetrically fixedly connected with mounting plates, and the mounting plates are provided with a plurality of through holes (13).

4. A miniaturized airborne optical fiber acceleration sensor according to claim 2, characterized in that: Both ends of the first installation groove (11) are provided with exit grooves (12); the high-strength optical fiber (5) is fixed in the exit groove (12) via a fixing structure (3); the fixing structure (3) is inserted in the exit groove (12); and the high-strength optical fiber (5) is fixed in the fixing structure (3).

5. The miniaturized airborne optical fiber acceleration sensor according to claim 1, characterized in that: The main body (1) and the cover plate (4) are made of aviation aluminum.

6. A miniaturized airborne optical fiber acceleration sensor according to claim 1, characterized in that: The material of the fixing component (2) is Invar.

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