Optical fiber pickup sensor and optical fiber sensing system

Abstract

This application provides an optical fiber microphone sensor and an optical fiber sensing system. The optical fiber microphone sensor includes an optical fiber, a sensitivity enhancement component, a first housing, and a second housing. The sensitivity enhancement component is coupled to the optical fiber. The first housing has a first opening and at least three first notches surrounding the edge of the first opening. The second housing has at least three second notches and covers the first opening. The first and second housings cooperate to form a receiving cavity. The sensitivity enhancement component is disposed in the receiving cavity. The second notches and first notches correspond one-to-one to form at least three through holes for the optical fiber to enter and exit the receiving cavity. This application can improve the convenience of optical fiber routing in the optical fiber microphone sensor and reduce the installation difficulty of the optical fiber microphone sensor.

Description

Technical Field

[0001] This application relates to the field of fiber optic sensor technology, and more specifically, to a fiber optic microphone sensor and a fiber optic sensing system. Background Technology

[0002] Fiber optic microphone sensors are specialized devices that apply fiber optic sensing technology to sound detection. They not only inherit many of the significant advantages of fiber optic sensing technology, such as strong resistance to electromagnetic interference, excellent corrosion resistance, high safety and reliability, and a simple structural design, but also possess outstanding characteristics such as small size, high sensitivity, and strong concealment. Furthermore, they exhibit advantages such as a wide dynamic range and excellent sound quality reproduction during measurement. Therefore, fiber optic microphone sensors and their derivative variations have always attracted widespread attention and favor from researchers.

[0003] The fiber optic microphone sensor comprises a sensitivity enhancement component, an optical fiber, and a housing. The sensitivity enhancement component is housed within the housing. The optical fiber needs to pass through the housing from the outside, couple with the sensitivity enhancement component, and then exit from the housing. The housing has through holes for the optical fiber to enter and exit. To reduce the risk of damage to the optical fiber, the optical fiber located outside the housing is usually encased in a metal corrugated tube. The high rigidity of the metal corrugated tube makes it difficult to bend or deform the optical fiber located outside the housing, and excessive bending can easily lead to excessive optical loss in the optical fiber.

[0004] However, when installing fiber optic microphones, there may be obstacles at the installation interface in some scenarios. These obstacles may be the mounting bracket for fixing the fiber optic microphone, the support structure of industrial equipment, or other external obstructions. Since the fiber optic microphone must or can only be installed at the installation interface where there are obstacles nearby, these obstacles prevent the fiber from passing through the housing. In addition, the bending of the metal corrugated tube is difficult, making the installation of the fiber optic microphone difficult and the installation conditions quite demanding.

[0005] Therefore, improving the ease of fiber optic cabling for fiber optic microphones and reducing the installation difficulty of fiber optic microphones is a technical problem that urgently needs to be solved. Utility Model Content

[0006] This application provides an optical fiber pickup sensor and an optical fiber sensing system, which can improve the convenience of optical fiber routing of the optical fiber pickup sensor and reduce the installation difficulty of the optical fiber pickup sensor.

[0007] This application is achieved through the following technical solution:

[0008] In a first aspect, this application provides an optical fiber microphone sensor, comprising an optical fiber, a sensitivity enhancement component, a first housing, and a second housing. The sensitivity enhancement component is coupled to the optical fiber. The first housing has a first opening and at least three first notches surrounding the edge of the first opening. The second housing has at least three second notches and covers the first opening. The first and second housings cooperate to form a receiving cavity, in which the sensitivity enhancement component is disposed. At least three wire-passing holes are formed by correspondingly placing the second and first notches into the receiving cavity. The wire-passing holes are used for the optical fiber to enter and exit the receiving cavity.

[0009] The technical solution of this application embodiment involves providing at least three first notches in the first housing, with the first notches surrounding the edge of the first opening, and providing second notches corresponding to the first notches in the second housing, such that the first and second notches together form at least three through holes for optical fibers to enter and exit the receiving cavity. When there are obstacles at the mounting interface of the optical fiber pickup sensor, the presence of multiple through holes allows the optical fiber to pass through or exit the receiving cavity, enabling the optical fiber to avoid obstacles, thereby improving the convenience of optical fiber routing in the optical fiber pickup sensor and reducing the installation difficulty of the optical fiber pickup sensor.

[0010] In some embodiments, the at least three cable holes include one cable outlet and at least two cable inlets, with the optical fiber entering the receiving cavity through one cable inlet and exiting the receiving cavity through the cable outlet.

[0011] In the technical solution of this application embodiment, when there are obstacles on the installation interface of the fiber optic pickup sensor, there are multiple inlet holes for the fiber optic cable to pass into the receiving cavity, so that the fiber optic cable can avoid the obstacles, which helps to improve the convenience of fiber optic cable routing of the fiber optic pickup sensor and reduce the installation difficulty of the fiber optic pickup sensor.

[0012] In some embodiments, the fiber optic pickup sensor further includes a plug that seals the inlet hole through which the optical fiber is not inserted.

[0013] In the technical solution of this application embodiment, the optical fiber is inserted through an inlet hole and exited through an outlet hole. By setting a plug to seal the inlet hole where no optical fiber is inserted, the risk of external dust entering the receiving cavity and affecting the sensitivity enhancement component is reduced, which helps to improve the reliability of the optical fiber pickup sensor.

[0014] In some embodiments, the first opening is located at one end of the first housing, and the wire-passing holes are arranged at intervals in the circumferential direction of the first opening. The central angle between two adjacent wire-passing holes in the circumferential direction of the first opening is α, which satisfies: 0°<α≤180°.

[0015] In the technical solution of this application embodiment, the central angle α between two adjacent through holes satisfies the above conditions. When there are obstacles on the installation interface of the fiber optic pickup sensor, there are multiple through holes for the optical fiber to enter the receiving cavity from multiple directions, so that the optical fiber can avoid obstacles, which helps to improve the convenience of the optical fiber routing of the fiber optic pickup sensor and reduce the installation difficulty of the fiber optic pickup sensor.

[0016] In some embodiments, the wire guide hole includes a first wire guide hole, a second wire guide hole, and a third wire guide hole, wherein the central angle α of the first wire guide hole and the second wire guide hole in the circumferential direction of the first opening is 180°, and the central angle α of the first wire guide hole and the third wire guide hole in the circumferential direction of the first opening satisfies: 5°≤α≤30°.

[0017] The technical solution of this application embodiment has three through holes. When there are obstacles on the installation interface of the fiber optic pickup sensor, the fiber optic cable can avoid the obstacles, which helps to improve the convenience of the fiber optic pickup sensor and reduce the installation difficulty of the fiber optic pickup sensor.

[0018] In some embodiments, the number of wire holes is 4, and α = 90°.

[0019] In the technical solution of this application embodiment, the number of through holes is 4, α=90°. When there are obstacles on the installation interface of the fiber optic pickup sensor, the fiber optic cable can avoid the obstacles, which helps to improve the convenience of fiber optic cable routing and reduce the installation difficulty of the fiber optic pickup sensor.

[0020] In some embodiments, the first housing and the second housing cooperate to form a cylindrical housing structure.

[0021] In some embodiments, the sensitivity enhancement component includes a frame and a sensitivity enhancement cylinder. The end of the frame near the second housing is an open end, and the end of the frame away from the second housing is a closed end. The sensitivity enhancement cylinder has an open structure at both ends, is sleeved on the frame, and the optical fiber is coupled to the sensitivity enhancement cylinder.

[0022] In the technical solution of this application embodiment, the skeleton serves as a load-bearing foundation, providing stable support for the sensitivity-enhancing cylinder and improving the reliability of the sensitivity-enhancing cylinder installation.

[0023] In some embodiments, the sidewalls of the frame are open. And / or, the frame is made of a vibration-damping material.

[0024] The technical solution of this application embodiment reduces the obstruction of sound waves by hollowing out the sidewalls of the skeleton, allowing external sound signals to be transmitted more smoothly to the sensitizing component and optical fiber. The hollowed-out sidewalls reduce the amount of material used in the skeleton, achieving lightweighting while ensuring support strength. By using vibration-damping materials to form the skeleton, the impact of vibration on the sensitizing cylinder and optical fiber is reduced, while also minimizing the possibility of loosening or relative displacement between the skeleton and the sensitizing cylinder.

[0025] Secondly, this application provides an optical fiber sensing system, including at least one optical fiber pickup sensor as described in any of the above embodiments.

[0026] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a structural diagram of the fiber optic microphone sensor provided in an embodiment of this application;

[0029] Figure 2 A cross-sectional view of the fiber optic microphone sensor provided in an embodiment of this application;

[0030] Figure 3 This is a structural diagram of the sensitivity enhancement component provided in an embodiment of this application;

[0031] Figure 4 A structural diagram of the skeleton provided in the embodiments of this application;

[0032] Figure 5 This is a structural diagram of the sensitivity-enhancing cylinder provided in an embodiment of this application;

[0033] Figure 6 A structural diagram of the fastener provided in the embodiments of this application;

[0034] Figure 7 A second shell structure diagram provided for an embodiment of this application;

[0035] Figure 8 A first shell structure diagram provided for an embodiment of this application;

[0036] Figure 9 A structural diagram showing the sensor enhancement component provided in this application embodiment placed inside the first housing;

[0037] Figure 10 A top view of a first housing provided for another embodiment of this application;

[0038] Figure 11 This is a schematic diagram of the installation of multiple fiber optic pickup sensors according to another embodiment of this application.

[0039] Icons: 1-Fiber optic microphone; 10-Amplifying component; 11-Frame; 111-Side wall; 112-Protruding edge; 12-Amplifying cylinder; 20-First housing; 21-First opening; 22-First notch; 23-First abutment; 30-Second housing; 31-Second notch; 32-Second abutment; 33-Limiting block; 40-Wire hole; 41-Wire outlet; 42-Wire inlet; 50-Hole plug; 60-Fixing component; 61-Annular groove; 70-Protective cover; 80-Sound transmission hole; 90-Fiber optic cable. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0041] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0042] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0043] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0044] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0045] In this application, "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0046] Please refer to Figures 1 to 11 , Figure 1 This is a structural diagram of the fiber optic microphone sensor provided in an embodiment of this application. Figure 2 This is a cross-sectional view of the fiber optic microphone sensor provided in an embodiment of this application. Figure 3 This is a structural diagram of the sensitivity enhancement component provided in an embodiment of this application. Figure 4 This is a structural diagram of the skeleton provided in the embodiments of this application. Figure 5 This is a structural diagram of the sensitivity-enhancing cylinder provided in an embodiment of this application. Figure 6 This is a structural diagram of the fastener provided in an embodiment of this application. Figure 7 This is a diagram of the second shell structure provided in an embodiment of this application. Figure 8 This is a first shell structure diagram provided for an embodiment of this application. Figure 9 This is a structural diagram showing the sensor enhancement component provided in this application being placed inside the first housing. Figure 10 A top view schematic diagram of a first housing provided for another embodiment of this application. Figure 11 This is a schematic diagram of the installation of multiple fiber optic pickup sensors provided in another embodiment of this application.

[0047] Please refer to Figures 1 to 11 This application provides an optical fiber microphone sensor 1, which includes an optical fiber 90, a sensitivity enhancement component 10, a first housing 20, and a second housing 30. The sensitivity enhancement component 10 is coupled to the optical fiber 90. The first housing 20 has a first opening 21 and at least three first notches 22 surrounding the edge of the first opening 21. The second housing 30 has at least three second notches 31 and covers the first opening 21. The first housing 20 and the second housing 30 cooperate to form a receiving cavity. The sensitivity enhancement component 10 is disposed in the receiving cavity. At least three wire-passing holes 40 are formed by correspondingly placing the second notches 31 and the first notches 22. The wire-passing holes 40 are used for the optical fiber 90 to enter and exit the receiving cavity.

[0048] The technical solution of this application embodiment provides at least three first notches 22 in the first housing 20, with the first notches 22 surrounding the edge of the first opening 21, and a second notch 31 corresponding to the first notches 22 in the second housing 30. This allows the first notches 22 and the second notches 31 to together form at least three through holes 40 for the optical fiber 90 to enter and exit the receiving cavity. When an obstacle obstructs one of the through holes 40 at the mounting interface of the optical fiber pickup sensor 1, the presence of multiple through holes 40 allows the optical fiber 90 to pass through or exit the receiving cavity, thus enabling the optical fiber 90 to avoid the obstacle. This improves the ease of routing the optical fiber 90 of the optical fiber pickup sensor 1 and reduces the installation difficulty of the optical fiber pickup sensor 1. Furthermore, the one-to-one correspondence between the second notch 31 and the first notch 22 to form a splicing structure of at least three through holes 40 facilitates the introduction and exit wiring operations of the optical fiber 90 of the optical fiber pickup sensor 1 within the receiving cavity.

[0049] In some embodiments, please refer to Figure 1 , Figure 2 , Figures 7 to 9 The first housing 20 can be a column, and the first opening 21 can be located at one end of the first housing 20 in its axial direction.

[0050] In some embodiments, please refer to Figure 1 , Figure 2 , Figures 7 to 9 The first housing 20 may have a first notch 22 at one end where the first opening 21 is provided. The first notch 22 is provided around the edge of the first opening 21 and penetrates the side wall of the first housing 20.

[0051] In some embodiments, reference Figure 1 , Figure 2 , Figures 7 to 9 The second housing 30 is connected to the first housing 20, and the second housing 30 covers the first opening 21. The first housing 20 and the second housing 30 together define a receiving cavity. A second notch 31 is provided at the end of the second housing 30 facing the first housing 20. When the first housing 20 and the second housing 30 are connected, the first notch 22 and the second notch 31 correspond to each other and together form a wire hole 40.

[0052] In some embodiments, the first housing 20 is provided with a first mounting hole (not shown in the figure) on its side, and the second housing 30 is provided with a second mounting hole on its side. When the second housing 30 is closed on the first opening 21, the first mounting hole and the second mounting hole are fixedly connected one-to-one by fasteners.

[0053] In some embodiments, the fiber optic pickup sensor 1 may further include a vibration damping pad and a mounting bracket (not shown in the figure), the mounting bracket being connected to the first housing 20 via the vibration damping pad.

[0054] In some embodiments, there are two vibration damping pads, located opposite each other on the side of the first housing 20. The mounting bracket is connected to the first housing 20 through these two vibration damping pads, achieving a stable connection between the mounting bracket and the first housing 20. The mounting bracket is configured to be connected to an external support structure, and the mounting bracket is connected to the housing of the fiber optic pickup sensor 1 through the vibration damping pads, so that the housing of the fiber optic pickup sensor 1 is in a suspended state.

[0055] The fiber optic microphone 1 can be connected to various support structures via a mounting bracket to test various devices under test, such as:

[0056] The fiber optic microphone 1 is installed on the channel steel of the conveyor frame to detect the operation of the conveyor. Specifically, during installation, the sound transmission hole 80 of the fiber optic microphone 1 should face downwards, and the mounting bracket is installed on the channel steel of the conveyor frame using vibration damping pads.

[0057] This embodiment forms a multi-stage vibration damping link: external equipment vibration—damping pad—fixed frame—damping pad—first housing 20—internal fixing component 60. The presence of the fixed frame eliminates the need for the sensor to be directly fixed by its own housing. The structural design of the fixed frame (such as drilling and snap-fit) can adapt to the mounting surfaces of different devices under test (such as channel steel, flat plate, cylindrical surface, etc.), greatly improving the versatility of the device. The thickness and material of the damping pad (such as rubber of different hardness) can be flexibly adjusted according to the vibration intensity of the device under test (such as using thicker / higher elastic pads in strong vibration scenarios), enhancing the flexibility of scenario adaptation.

[0058] The vibration damping pads reduce the rigid impact and friction between the fixing frame and the first housing 20, and reduce the wear rate of the housing; at the same time, the multi-stage vibration damping avoids fatigue damage to the internal sensitizing components 10 and optical fiber 90 caused by long-term strong vibration (such as optical fiber 90 breakage and sensitizing cylinder 12 deformation), and significantly extends the service life of the core components.

[0059] The structure of the mounting bracket and vibration damping pads is simple and can be disassembled and replaced (if the pads age, they can be replaced individually without replacing the entire sensor), resulting in low maintenance costs. Furthermore, the replacement process does not affect the core components inside the housing (because the housing connection and internal positioning are independent of the mounting bracket), further improving the economic efficiency of the equipment.

[0060] In some embodiments, the number of first notches 22 can be multiple, such as 3, 4, 5, 6, etc. One embodiment of this application selects 3 notches.

[0061] In some embodiments, the number of second notches 31 can be multiple, such as 3, 4, 5, 6, etc. One embodiment of this application selects 3 notches.

[0062] In some embodiments, the number of first notches 22 and second notches 31 is equal, that is, the number of wire holes 40 can be multiple, such as 3, 4, 5, 6, etc.

[0063] In some embodiments, please refer to Figures 2 to 9 The fiber optic microphone 1 may also include a fixing member 60, and the sensitivity enhancement component 10 is fixedly connected to the fixing member 60. The first housing 20 is provided with a first abutting part 23, and the second housing 30 is provided with a second abutting part 32. When the second housing 30 is closed over the first opening 21, the first abutting part 23 presses against one side of the fixing member 60 along the axial direction of the first housing 20, and the second abutting part 32 presses against the other side of the fixing member 60 along the axial direction of the first housing 20, thereby fixing the fixing member 60 at its upper limit in the axial direction of the first housing 20.

[0064] In some embodiments, the sensitization component 10 is the "core sensitization unit" of the sensor, a key component for converting sound signals (vibration signals) into detectable signals by the optical fiber 90. It typically includes a frame 11, a sensitization cylinder 12, etc. The frame 11 provides support, and the sensitization material or structure of the sensitization cylinder 12 amplifies the minute deformations caused by external sound (vibration), enabling the optical fiber 90 to capture signals more sensitively (i.e., the "sensitization" effect). The space formed between the first abutment portion 23 and the second abutment portion 32 for accommodating the fixing member 60, the cross-section of which can be S-shaped, arc-shaped, C-shaped, or other shapes, aims to fix the fixing member 60 in position along the axial direction of the first housing 20 by pressing it.

[0065] In some implementation methods, please refer to Figure 2 , Figures 6 to 9 The fastener 60 can be a ring-shaped structure, which is sleeved and fixed on the sensitizing component 10. The structure is simple and easy to install and remove. The fastener 60 can also be a component of other structures, or a collection of multiple components, which are fixed on the sensitizing component 10 by means of sleeve, snap-fit ​​or plug-in.

[0066] In some preferred embodiments, the fixing member 60 is made of a vibration-damping material, so that the sensitizing component 10 is vibration-damped and fixedly disposed within the receiving cavity. The fixing member 60 can be made of rubber-based materials, such as nitrile rubber (NBR), silicone rubber (SR), fluororubber (FKM), neoprene rubber (CR), etc.; the fixing member 60 can also be made of elastic plastics or composite materials, etc. The vibration-damping material of the fixing member 60 can reduce the impact of the vibration of the first housing 20 and the second housing 30 on the sensitizing component 10 and the optical fiber 90, and can also achieve the positioning of the sensitizing component 10 along the first direction within the receiving cavity through the first abutment part 23 and the second abutment part 32, reducing loosening or displacement.

[0067] In some embodiments, please refer to Figure 2and Figure 9 The sensitizing component 10 is spaced apart from the inner wall of the first housing 20. This separation avoids direct contact and reduces the direct transmission of vibrations from the first housing 20 to the sensitizing component 10.

[0068] In some embodiments, please refer to Figure 2 , Figures 7 to 9 The second housing 30 is lid-shaped, and the inner surface of the second housing 30 forms the second abutment portion 32. The fixing member 60 is directly supported by the inner surface of the second housing 30 and the first abutment portion 23 is used to realize the positioning of the sensitive enhancement component 10 in the accommodating cavity along the axial direction of the first housing 20. The structure is simple and the cost is low.

[0069] By combining the first housing 20, the second housing 30, and the fixing member 60, the sensitizing component 10 is positioned and fixed along the axial direction of the first housing 20 through the cover of the housings (i.e., the first housing 20 and the second housing 30), reducing the number of parts and simplifying the overall structure. During assembly, only the sensitizing component 10 with the fixing member 60 needs to be placed into the first housing 20, and then the second housing 30 is placed on top; there is no need to tighten bolts to fix the sensitizing component 10, significantly improving the convenience of loading and unloading and assembly efficiency. The addition of the fixing member 60, and the limiting and fixing of the fixing member 60 along the axial direction of the first housing 20 by the first abutment part 23 and the second abutment part 32, achieves the limiting of the fixing member 60 and the sensitizing component 10 along the axial direction of the first housing 20.

[0070] In other embodiments, there are multiple first abutment portions 23, which are arranged circumferentially around the inner wall of the first housing 20 at intervals. There are also multiple second abutment portions 32, which are arranged circumferentially around the inner wall of the second housing 30 at intervals. Specifically, they can be protruding structures.

[0071] In some other embodiments, a first annular groove 61 with the axial direction of the first housing 20 as the central axis may be formed in the first housing 20, and a second annular groove 61 with the axial direction of the first housing 20 as the central axis may be formed in the second housing 30. When the second housing 30 covers the first opening 21 of the first housing 20, the first annular groove 61 and the second annular groove 61 cooperate to form a third annular groove 61. The fixing member 60 is fixedly engaged with the third annular groove 61 to fix the fixing member 60 at the upper limit of the axial direction of the first housing 20. The first abutting part 23 is the inner wall of the first annular groove 61, and the second abutting part 32 is the inner wall of the second annular groove 61.

[0072] In some other embodiments, the second abutment portion 32 is formed on the inner surface of the second housing 30, and there are multiple first abutment portions 23, which are arranged around the axis of the first housing 20 at the inner periphery of the first opening 21.

[0073] In some embodiments, please refer to Figure 2 , Figures 7 to 9 The first housing 20 is provided with five first abutting parts 23. In the axial direction of the first housing 20, the first abutting parts 23 extend out of the first housing 20 and abut against the side of the fixing member 60 near the first housing 20.

[0074] In some embodiments, please refer to Figure 2 , Figures 7 to 9 The second housing 30 is also provided with a plurality of limiting blocks 33. When the second housing 30 is closed to the first opening 21, the limiting blocks 33 abut against the fixing member 60, and the limiting blocks 33 limit the fixing member 60 in the radial direction of the first housing 20.

[0075] In some embodiments, please refer to Figure 7 There are multiple limit blocks 33, and the multiple limit blocks 33 are arranged at intervals around the axis of the first housing 20.

[0076] In some embodiments, please refer to Figure 2 and Figure 7 The end cap of the second housing 30 is a protective cover 70, and the protective cover 70 is provided with a sound-permeable hole 80. The sensitizing component 10 has a sound cavity communicating with the sound-permeable hole 80 and / or the sensitizing component 10 cooperates with the first housing 20 and the second housing 30 to form a sound cavity communicating with the sound-permeable hole 80.

[0077] The sound-permeable hole 80 allows external sound waves to enter the receiving cavity and directly act on the sensitizing component 10 of the coupled optical fiber 90. The sensitizing component 10 has a sound cavity that communicates with the sound-permeable hole 80, which amplifies the sound effect and helps to further improve the sensitizing effect of the sensitizing component 10.

[0078] In some embodiments, please refer to Figure 2 , Figures 7 to 9 The second housing 30 is also provided with limiting blocks 33. When the second housing 30 is closed to the first opening 21, the limiting blocks 33 abut against the fixing member 60, and the limiting blocks 33 press the fixing member 60 toward the central axis to limit and fix the fixing member 60 radially. The six limiting blocks 33 press the fixing member 60 toward the center to prevent the fixing member 60 from moving radially along the first housing 20.

[0079] Please refer to Figure 10 and Figure 11In some embodiments, at least three cable holes 40 include one cable outlet 41 and at least two cable inlets 42, with the optical fiber 90 entering the receiving cavity through one cable inlet 42 and exiting the receiving cavity through the cable outlet 41.

[0080] In some embodiments, please refer to Figure 1 , Figures 7 to 9 The structure and size of each wire hole 40 can be the same. Depending on the application, the wire holes 40 are divided into wire inlet holes 42 and wire outlet holes 41.

[0081] In some embodiments, the number of outlet holes 41 can be 1, 2, 3, 4, etc.

[0082] In some embodiments, the number of inlet holes 42 can be 1, 2, 3, 4, etc.

[0083] In the technical solution of this application embodiment, when there is an obstacle on the installation interface of the fiber optic pickup sensor 1, there are multiple inlet holes 42 for the fiber optic 90 to pass into the receiving cavity. The inlet holes 42 that can lead the wire can be flexibly selected, which is beneficial to improve the convenience of the fiber optic 90 wiring of the fiber optic pickup sensor 1 and reduce the installation difficulty of the fiber optic pickup sensor 1.

[0084] In some embodiments, please refer to Figure 7 The fiber optic pickup sensor 1 also includes a plug 50, which blocks the inlet hole 42 where no optical fiber is inserted.

[0085] In some embodiments, please refer to Figure 7 When the optical fiber 90 is connected to the sensitivity enhancement component 10, the optical fiber 90 enters the receiving cavity through an inlet hole 42 and exits the receiving cavity through an outlet hole 41. Unused outlet holes 40 are sealed by providing a plug 50. (Explanatory) Figure 7 Three hole plugs 50 are provided. After the actual wiring is completed, one hole plug 50 is left to seal the unused wire passage hole 40.

[0086] In some embodiments, the plug 50 may be made of plastic.

[0087] In the technical solution of this application embodiment, the optical fiber 90 is inserted through an inlet hole 42 and exited through an outlet hole 41. By setting a plug 50 to seal the inlet hole 42 where the optical fiber 90 is not inserted, the risk of external dust entering the receiving cavity and affecting the sensitivity enhancement component 10 is reduced, which is beneficial to improving the reliability of the optical fiber pickup sensor 1.

[0088] Please refer to Figure 10 , Figure 10The diagram illustrates how a central angle is represented. In some embodiments, the first opening 21 is located at one end of the first housing 20, and the wire holes 40 are spaced apart circumferentially around the first opening 21. The central angle α between two adjacent wire holes 40 circumferentially around the first opening 21 satisfies: 0° < α ≤ 180°. Furthermore, depending on the specific scenario requirements, the central angle α can be designed to be other angles as needed.

[0089] In some embodiments, please refer to Figure 1 and Figure 2 Both the first shell 20 and the second shell 30 can be cylindrical.

[0090] In some embodiments, the central angle α between two adjacent wire holes 40 can be any value or a value between any of the following: 10°, 20°, 30°, 40°, 50°, 60°, 70°, 80°, 90°, 100°, 110°, 120°, 130°, 140°, 150°, 160°, 170°, and 180°.

[0091] In some embodiments, the number of wire guide holes 40 can be three. The central angle between the first wire guide hole 40 and the second wire guide hole 40 can be 60°, the central angle between the second wire guide hole 40 and the third wire guide hole 40 can be 120°, and the central angle between the third wire guide hole 40 and the first wire guide hole 40 can be 180°. Alternatively, the central angle between the first wire guide hole 40 and the second wire guide hole 40 can be 30°, the central angle between the second wire guide hole 40 and the third wire guide hole 40 can be 60°, and the central angle between the third wire guide hole 40 and the first wire guide hole 40 can be 270°.

[0092] In some embodiments, the number of wire through holes 40 can be four. The central angle between the first wire through hole 40 and the second wire through hole 40 can be 60°, the central angle between the second wire through hole 40 and the third wire through hole 40 can be 120°, the central angle between the third wire through hole 40 and the fourth wire through hole 40 can be 60°, and the central angle between the fourth wire through hole 40 and the first wire through hole 40 can be 120°. Alternatively, the central angle between the first wire through hole 40 and the second wire through hole 40 can be 30°, the central angle between the second wire through hole 40 and the third wire through hole 40 can be 60°, the central angle between the third wire through hole 40 and the fourth wire through hole 40 can be 180°, and the central angle between the fourth wire through hole 40 and the first wire through hole 40 can be 90°.

[0093] In some embodiments, the number of wire through holes 40 can be five, the central angle between the first wire through hole 40 and the second wire through hole 40 can be 60°, the central angle between the second wire through hole 40 and the third wire through hole 40 can be 120°, the central angle between the third wire through hole 40 and the fourth wire through hole 40 can be 60°, the central angle between the fourth wire through hole 40 and the fifth wire through hole 40 can be 60°, and the central angle between the fifth wire through hole 40 and the first wire through hole 40 can be 60°. Alternatively, the central angle between the first wire hole 40 and the second wire hole 40 can be 30°, the central angle between the second wire hole 40 and the third wire hole 40 can be 60°, the central angle between the third wire hole 40 and the fourth wire hole 40 can be 180°, the central angle between the fourth wire hole 40 and the fifth wire hole 40 can be 45°, and the central angle between the fourth wire hole 40 and the fifth wire hole 40 can be 45°.

[0094] When there are multiple wire through holes 40, the wire through holes 40 can be evenly distributed around the perimeter, that is, the central angle between any two adjacent wire through holes 40 is equal, or the central angle between any two adjacent wire through holes 40 can be unequal. The number of wire through holes 40 and the corresponding central angle α can be flexibly designed according to specific application scenarios and requirements.

[0095] In the technical solution of this application embodiment, the central angle α between two adjacent through holes 40 satisfies the above conditions. When there are obstacles on the installation interface of the fiber optic pickup sensor 1, there are multiple inlet holes 42 for the fiber optic 90 to enter the receiving cavity from multiple directions, so that the fiber optic 90 can avoid obstacles, which is conducive to improving the convenience of the fiber optic 90 routing of the fiber optic pickup sensor 1 and reducing the installation difficulty of the fiber optic pickup sensor 1.

[0096] In some embodiments, the wire through hole 40 includes a first wire through hole, a second wire through hole, and a third wire through hole, wherein the central angle α of the first wire through hole and the second wire through hole in the circumferential direction of the first opening 21 is 180°, and the central angle α of the first wire through hole and the third wire through hole in the circumferential direction of the first opening 21 satisfies: 5°≤α≤30°.

[0097] In some embodiments, the central angle α of the first and third wire through holes in the circumferential direction of the first opening 21 can be any value among 5°, 10°, 15°, 20°, 25°, and 30°, or any value between any two values. Taking a central angle α of 15° for the first and third wire through holes in the circumferential direction of the first opening 21 as an example, the central angle α of 165° for the second and third wire through holes in the circumferential direction of the first opening 21 is also considered.

[0098] In some embodiments, the number of wire holes 40 is 3, and α = 120°.

[0099] In some embodiments of this application, the number of through holes 40 is 3, and α=120°. When there are obstacles on the installation interface of the fiber optic pickup sensor 1, it is beneficial to improve the convenience of the fiber optic cable 90 of the fiber optic pickup sensor 1 and reduce the installation difficulty of the fiber optic pickup sensor 1.

[0100] In some embodiments, the number of through holes 40 is four, and α=90°. In some embodiments of this application, the number of through holes 40 is four, and α=90°. When there are obstacles on the installation interface of the fiber optic pickup sensor 1, this facilitates the routing of the fiber optic cable 90 of the fiber optic pickup sensor 1 and reduces the installation difficulty of the fiber optic pickup sensor 1.

[0101] Please refer to Figure 10 In some embodiments, the number of through holes 40 is three, and α=90°. When there are obstacles on the mounting interface of the fiber optic pickup sensor 1, different through holes 40 can be selected to lead the wire, which helps to improve the convenience of fiber optic cable routing of the fiber optic pickup sensor 1 and reduce the installation difficulty of the fiber optic pickup sensor 1.

[0102] In some embodiments, the number of wire holes 40 is 6, and α = 60°.

[0103] In some embodiments of this application, the number of through holes 40 is 6, and α=60°. When there are obstacles on the installation interface of the fiber optic pickup sensor 1, it is beneficial to improve the convenience of the fiber optic cable 90 of the fiber optic pickup sensor 1 and reduce the installation difficulty of the fiber optic pickup sensor 1.

[0104] In some embodiments, please refer to Figure 1 , Figure 2 , Figures 7 to 9 The first shell 20 and the second shell 30 cooperate to form a cylindrical shell structure.

[0105] In some embodiments, please refer to Figures 2 to 5 The sensitivity enhancement component 10 includes a frame 11 and a sensitivity enhancement cylinder 12. The end of the frame 11 closest to the second housing 30 is an open end, and the end of the frame 11 furthest from the second housing 30 is a closed end. The sensitivity enhancement cylinder 12 has an open structure at both ends and is sleeved on the frame 11. The optical fiber 90 is coupled to the sensitivity enhancement cylinder 12.

[0106] In some embodiments, please refer to Figures 2 to 4 The frame 11 has a raised edge 112 at one end near the second housing 30, and the fastener 60 is disposed on the raised edge 112.

[0107] In some embodiments, the frame 11 of the sensitizing component 10 can be integrally formed with the fixing member 60 to reduce the number of parts. Furthermore, in order to reduce the impact of vibration of the first housing 20 and the second housing 30 on the sensitizing cylinder 12, the frame 11 and the fixing member 60 can be integrally formed using a vibration-damping material to improve the vibration-damping effect.

[0108] In some embodiments, please refer to Figures 2 to 6 The frame 11 and the fastener 60 can be separately installed, and the frame 11 and / or the fastener 60 are made of vibration-damping material. The specific material can be selected and designed according to the requirements of vibration damping and hardness. The sensitivity enhancement component 10 is divided into the frame 11 and the sensitivity enhancement cylinder 12, making the functional division of the core components clearer: the frame 11 serves as the load-bearing foundation, providing stable support for the sensitivity enhancement cylinder 12; while the sensitivity enhancement cylinder 12 serves as the coupling carrier for the optical fiber 90. Coupling can be achieved by winding, and further fixation can be achieved by applying adhesive, without specific limitations.

[0109] In some embodiments, please refer to Figures 2 to 4 The sidewalls 111 of the skeleton 11 are hollowed out. The hollowed-out structure reduces the obstruction of sound waves by the skeleton 11, allowing external sound signals to be transmitted more smoothly to the sensitizing cylinder 12 of the sensitizing component 10 and the coupled optical fiber 90. The hollowed-out sidewalls 111 reduce the amount of material used in the skeleton 11, achieving lightweighting while ensuring support strength.

[0110] In some embodiments, please refer to Figures 2 to 6 The fastener 60 has a ring-shaped structure. An annular groove 61 extending circumferentially along the inner periphery of the ring-shaped structure is provided. The protruding edge 112 extends circumferentially in the skeleton 11 and is installed in the annular groove 61.

[0111] Please refer to the technical solutions of the embodiments of this application. Figures 2 to 5 The frame 11 serves as a load-bearing foundation, providing stable support for the sensitizer 12 and improving the reliability of the sensitizer 12 installation.

[0112] In some embodiments, the frame 11 is made of a vibration-damping material. By selecting a vibration-damping material to form the frame 11, the impact of vibration on the sensitive cylinder 12 and the optical fiber 90 is reduced.

[0113] In addition, the fiber optic pickup sensor 1 also includes a protective sleeve (not shown in the figure), in which the optical fiber 90 extending from the receiving cavity is inserted to protect the optical fiber 90. Depending on the material, the protective sleeve can be a metal corrugated pipe or a plastic sleeve, etc., and there is no specific limitation.

[0114] Please refer to Figure 1 and Figure 11This application provides an optical fiber sensing system, which includes at least one optical fiber pickup sensor 1 as described in any of the above embodiments.

[0115] In some embodiments, the fiber optic sensing system may include a host device and a fiber optic microphone 1, with the input and output lines of the fiber optic microphone 1 connected to corresponding ports of the host device. When the device contains only one fiber optic microphone 1, the sensor's input line (for receiving the detection light signal emitted by the host) and output line (for transmitting the light signal carrying sound information back) are directly connected to the corresponding ports of the host device.

[0116] The fiber optic sensing system can also include a host device and multiple fiber optic audio sensors 1, which are connected in series to the host device. When the device contains multiple fiber optic audio sensors 1, the sensors can be connected to the host device in series—that is, the output line of the previous sensor is connected to the input line of the next sensor, and finally the output line of the last sensor is connected to the host device. This supports long-distance, multi-node distributed monitoring (such as synchronous monitoring of multiple devices on a production line) without the need for additional signal amplification equipment, significantly reducing system complexity.

[0117] As the "brain" of the system, the host device undertakes the core functions of optical signal transmission, reception, analysis, and data processing, including: transmitting stable detection optical signals (such as lasers) to the fiber optic pickup sensor 1, and converting the optical path change (or phase and intensity change) caused by sound vibration into measurable optical signal changes through the optical fiber 90 on the sensitization component 10; receiving the optical signals returned by the sensor, converting the optical signals into electrical signals through the built-in photoelectric conversion module (such as a photodetector), and then analyzing the key information such as the frequency and intensity of the sound through signal processing algorithms (such as noise reduction, filtering, and feature extraction); having data storage, display, or communication functions, it can display the analysis results in real time (such as equipment operating status and abnormal alarms), or upload them to the cloud platform via wired (Ethernet) or wireless (4G / 5G, LoRa) methods, supporting remote monitoring and historical data traceability.

[0118] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An optical fiber pickup sensor, characterized by, include: optical fiber; Sensitization enhancement component, coupled to the optical fiber; A first housing has a first opening, and the first housing has at least three first notches, the at least three first notches surrounding the edge of the first opening; The second housing has at least three second notches. The second housing covers the first opening. The first housing and the second housing cooperate to form a receiving cavity. The sensitivity enhancement component is disposed in the receiving cavity. The second notches and the first notches correspond one-to-one to form at least three wire passage holes. The wire passage holes are used for the optical fiber to enter and exit the receiving cavity.

2. The optical fiber sound pickup sensor of claim 1, wherein, The at least three cable passages include one cable exit and at least two cable inlets, the optical fiber is inserted into the receiving cavity through one of the cable inlets, and the optical fiber is exited from the receiving cavity through the cable exit.

3. The fiber optic microphone sensor according to claim 2, characterized in that, The fiber optic pickup sensor also includes a plug that seals the inlet hole that is not inserted into the fiber optic cable.

4. The fiber optic microphone sensor according to claim 1, characterized in that, The first opening is located at one end of the first housing, and the wire holes are arranged at intervals around the first opening; The central angle between two adjacent through holes in the circumferential direction of the first opening is α, which satisfies: 0°<α≤180°.

5. The fiber optic microphone sensor according to claim 4, characterized in that, The wire guide hole includes a first wire guide hole, a second wire guide hole, and a third wire guide hole, wherein the central angle α of the first wire guide hole and the second wire guide hole in the circumferential direction of the first opening is 180°, and the central angle α of the first wire guide hole and the third wire guide hole in the circumferential direction of the first opening satisfies: 5°≤α≤30°.

6. The fiber optic microphone sensor according to claim 4, characterized in that, The number of wire holes is 4, and α = 90°.

7. The fiber optic microphone sensor according to claim 4, characterized in that, The first shell and the second shell cooperate to form a cylindrical shell structure.

8. The fiber optic microphone sensor according to claim 1, characterized in that, The sensitivity enhancement component includes: The skeleton has an open end near the second shell and a closed end away from the second shell. The sensitivity-enhancing cylinder has an open structure at the top and bottom, is sleeved on the frame, and the optical fiber is coupled to the sensitivity-enhancing cylinder.

9. The fiber optic microphone sensor according to claim 8, characterized in that, The sidewalls of the frame are hollowed out; and / or the frame is made of vibration-damping material.

10. A fiber optic sensing system, characterized in that, It includes at least one fiber optic audio pickup sensor as described in any one of claims 1-9.

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