Optical fiber pickup sensor and optical fiber sensing system

Abstract

This application provides an optical fiber pickup sensor and an optical fiber sensing system, comprising: an optical fiber; a sensitivity enhancement component coupled to the optical fiber and the sensitivity enhancement component; a fixing member fixedly connected to the sensitivity enhancement component; a first housing having a first opening; and a second housing covering the first opening along a first direction, the first and second housings cooperating to form a receiving cavity in which the sensitivity enhancement component and the fixing member are received; the first housing having a first abutment portion and the second housing having a second abutment portion; when the second housing is covered by the first opening, the first abutment portion presses against one side of the fixing member along the first direction, and the second abutment portion presses against the other side of the fixing member along the first direction, thereby upper-positioning and fixing the fixing member in the first direction. Through the combination of the first housing, the second housing, and the fixing member, the positioning and fixing of the sensitivity enhancement component is achieved by covering the housings. During assembly, only the sensitivity enhancement component with the fixing member needs to be placed into the first housing, and then the second housing is closed.

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 microphones are specialized devices that apply fiber optic sensing technology to sound detection. They not only inherit many significant advantages of fiber optic sensing technology, such as strong anti-electromagnetic interference capability, excellent corrosion resistance, high safety and reliability, and simple structural design, but also have outstanding features such as small size, high sensitivity, and strong concealment. Furthermore, they exhibit advantages such as wide dynamic range and excellent sound quality reproduction during the measurement process.

[0003] Therefore, fiber optic microphones and their derivative variations have always attracted widespread attention and favor from researchers. However, current devices have certain design limitations: the support for the sensitivity-enhancing components inside the microphone box usually needs to be fixed in position using fastening bolts and other components, which not only makes the overall structure relatively complex but also brings many inconveniences to the installation and removal of the device. Utility Model Content

[0004] The purpose of this application is to provide an optical fiber pickup sensor and an optical fiber sensing system to solve the problem that the bracket of the sensitivity enhancement component inside the existing pickup box usually needs to be fixed in position by means of fastening bolts and other parts, which not only makes the overall structure relatively complex, but also brings many inconveniences to the installation and removal of the equipment.

[0005] This application provides an embodiment of an optical fiber microphone sensor, comprising:

[0006] optical fiber;

[0007] Sensitization enhancement component; optical fiber coupled to the sensitization enhancement component;

[0008] The fastener and the sensitizing component are fixedly connected to the fastener;

[0009] A first housing having a first opening;

[0010] The second housing covers the first opening along the first direction, and the first housing and the second housing cooperate to form a receiving cavity, in which the sensitizing component and the fixing member are received;

[0011] The first housing is provided with a first abutting part, and the second housing is provided with a second abutting part. When the second housing is closed on the first opening, the first abutting part presses against one side of the fixing member in the first direction, and the second abutting part presses against the other side of the fixing member in the first direction, so as to fix the fixing member at the upper limit in the first direction.

[0012] In the above technical solution, the combination of a first housing, a second housing, and a fixing member allows for the positioning and fixation of the sensitivity-enhancing component through the housing cover, reducing the number of parts and simplifying the overall structure. During assembly, simply place the sensitivity-enhancing component with the fixing member into the first housing and then cover it with the second housing; there is no need to tighten bolts to fix the sensitivity-enhancing component, significantly improving the convenience of loading and unloading and assembly efficiency. The addition of the fixing member, and the limitation and fixation of the fixing member by the first and second abutment parts, achieves the limitation of the fixing member and the sensitivity-enhancing component along the first direction.

[0013] In some alternative embodiments, the second housing is further provided with a limiting block, which abuts against the fixing member when the second housing is closed to the first opening, and the limiting block limits and fixes the fixing member in a second direction perpendicular to the first direction.

[0014] In some alternative implementations, there are multiple limiting blocks, which are arranged at intervals around the first direction with the first direction as the central axis.

[0015] In some alternative implementations, the sensitivity enhancement component includes:

[0016] The skeleton has an open end near the second shell and a closed end away from the second shell.

[0017] Sensitizer tube, which has an open structure at the top and bottom, is fitted onto the frame and the optical fiber is placed on the sensor tube;

[0018] The frame has a raised edge at one end near the second housing, and the fastener is disposed on the raised edge.

[0019] In the above technical solution, the sensitivity enhancement component is divided into a skeleton (in some embodiments, the bottom end of the skeleton is closed and the top end has a raised edge) and a sensitivity enhancement cylinder (in some embodiments, the sensitivity enhancement cylinder is open at the top and bottom and fitted with the skeleton), which makes the functional division of the core components clearer: the skeleton serves as a load-bearing foundation, providing stable support for the sensitivity enhancement cylinder and optical fiber; the sensitivity enhancement cylinder serves as an optical fiber winding carrier, facilitating uniform winding of the optical fiber and sensitivity enhancement.

[0020] In some alternative implementations, the sidewalls of the skeleton are hollowed out.

[0021] The openwork structure reduces the obstruction of sound waves by the frame, allowing external sound signals to be transmitted more smoothly to the sensitizing components and the wound optical fibers. The openwork sidewalls reduce the amount of material used in the frame, achieving lightweighting while ensuring support strength.

[0022] In some alternative embodiments, the fastener has a ring-shaped structure, with an annular groove extending circumferentially along the inner periphery of the ring-shaped structure, and a protruding edge extending circumferentially in the skeleton, the protruding edge being installed in the annular groove.

[0023] In some alternative embodiments, the skeleton and the fastener are integrally formed.

[0024] In some alternative implementations, the frame is made of a vibration-damping material.

[0025] In some alternative implementations, at least three cable outlets are included;

[0026] The first housing has at least three first notches distributed at different positions of the first opening, and the second housing has at least three second notches distributed at different positions of the second opening. Each first notch corresponds to a second notch. When the second housing is closed on the first opening, each first notch and the corresponding second notch form a corresponding outlet hole.

[0027] The above technical solution provides three or more cable exit holes to facilitate flexible selection of cable exit positions. It should be noted that the fiber optic microphone sensor has two wiring positions, one inlet and one outlet. Since this embodiment has three or more cable exit holes, it is necessary to select two cable exit holes that are convenient for cable exit.

[0028] In some alternative implementations, at least three outlet holes include two first outlet holes and one second outlet hole; wherein one of the two first outlet holes is used for cable entry and the other for cable exit, and a plug is provided at the position of the second outlet hole.

[0029] In some optional embodiments, the second housing is provided with a sound-permeable hole, the sensitizing component has a sound cavity communicating with the sound-permeable hole, and / or the sensitizing component cooperates with the first housing and the second housing to form a sound cavity communicating with the sound-permeable hole.

[0030] In the above technical solution, the sound-permeable hole allows external sound waves to enter the housing and directly act on the sensitizing cylinder (the core sensing component of the sensitizing assembly) wrapped with optical fiber. The sound cavity has an amplification effect, which can further improve the sensitizing effect of the sensitizing assembly.

[0031] In some alternative embodiments, there are multiple first abutting portions, which are arranged at intervals around a first direction, and there are multiple second abutting portions, which are arranged at intervals around a first direction.

[0032] In some optional embodiments, a first annular groove with a first direction as the central axis is formed in the first housing, and a second annular groove with a first direction as the central axis is formed in the second housing. When the second housing is closed to the first opening, the first annular groove and the second annular groove cooperate to form a third annular groove. The fixing member is fixedly engaged with the third annular groove to fix the fixing member at the upper limit in the first direction. The first abutting part is the inner wall of the first annular groove, and the second abutting part is the inner wall of the second annular groove.

[0033] In some alternative embodiments, the second housing is in the form of a cap, and the inner surface of the second housing forms the second abutment portion.

[0034] In some alternative embodiments, a first mounting hole is provided on the side of the first housing, and a second mounting hole is provided on the side of the second housing. When the second housing is closed to the first opening, the first mounting hole and the second mounting hole are fixedly connected one-to-one by fasteners.

[0035] In some alternative implementations, the fiber optic pickup sensor also includes vibration damping pads and a mounting bracket, the mounting bracket being connected to the first housing via the vibration damping pads.

[0036] In the above technical solution, there are two vibration damping pads, located opposite each other on the side of the first housing. The mounting bracket is connected to the first housing through these two vibration damping pads, achieving a stable connection between the mounting bracket and the first housing. 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 microphone sensor through the vibration damping pads, so that the housing of the fiber optic microphone sensor is in a suspended state.

[0037] The fiber optic microphone can be attached to various support structures using a mounting bracket to test a variety of devices under test, such as:

[0038] Fiber optic microphones are mounted on the channel steel of the conveyor frame to detect the conveyor's operating status. Specifically, during installation, the sound-transmitting holes of the fiber optic microphones should face downwards, and the mounting bracket should be installed on the channel steel of the conveyor frame using vibration-damping pads.

[0039] In some optional embodiments, the sensitizing component is spaced apart from the inner wall of the first housing. In the above technical solution, the sensitizing component is spaced apart from the inner wall of the first housing to avoid direct contact, which can reduce the direct transmission of vibrations from the first housing to the sensitizing component.

[0040] In some alternative embodiments, the fastener is made of a vibration-damping material so that the sensitivity-enhancing component is vibration-damped and fixedly disposed within the receiving cavity.

[0041] In the above technical solution, the fastener is made of vibration-damping material, which can reduce the impact of vibration of the first and second housings on the sensitivity enhancement component and optical fiber, and can also realize the positioning of the sensitivity enhancement component in the receiving cavity through the first and second abutting parts, reducing loosening or displacement.

[0042] An embodiment of this application provides an optical fiber sensing system, comprising: one or more optical fiber pickup sensors as described above.

[0043] Specifically, the fiber optic sensing system may include a host device and a fiber optic microphone sensor. The input and output lines of the fiber optic microphone sensor are connected to the corresponding ports of the host device, respectively. The output line of the fiber optic microphone sensor is connected to the input terminal of the host device, and the input line of the fiber optic microphone sensor is connected to the output terminal of the host device.

[0044] The fiber optic sensing system may also include a host device and multiple fiber optic pickup sensors, which are connected in series to the host device. Attached Figure Description

[0045] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application 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.

[0046] Figure 1 This is a structural diagram of the fiber optic microphone sensor provided in an embodiment of this application;

[0047] Figure 2 A cross-sectional view of the fiber optic microphone sensor provided in an embodiment of this application;

[0048] Figure 3 This is a structural diagram of the sensitivity enhancement component provided in an embodiment of this application;

[0049] Figure 4 A structural diagram of the skeleton provided in the embodiments of this application;

[0050] Figure 5 This is a structural diagram of the sensitivity-enhancing cylinder provided in an embodiment of this application;

[0051] Figure 6 A structural diagram of the fastener provided in the embodiments of this application;

[0052] Figure 7 A second shell structure diagram provided for an embodiment of this application;

[0053] Figure 8 A first shell structure diagram provided for an embodiment of this application;

[0054] Figure 9 This is a structural diagram showing the sensor enhancement component provided in an embodiment of this application placed inside a first housing.

[0055] Icons: 100-fixing component, 101-annular groove; 200-first housing, 201-first abutting part; 300-second housing, 301-second abutting part, 302-limiting block; 400-protective cover; 500-sound-permeable hole; 600-sensitizing component, 601-frame, 6011-protruding edge, 6012-side wall, 602-sensitizing cylinder. Detailed Implementation

[0056] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0057] Please refer to Figures 1-9 , Figure 1 This is a structural diagram of the fiber optic microphone sensor provided in an embodiment of this application; Figure 2 A cross-sectional view of an optical fiber pickup sensor provided in an embodiment of this application; an optical fiber pickup sensor provided in an embodiment of this application includes:

[0058] Optical fiber (not shown in the figure);

[0059] Sensitization enhancement component 600, optical fiber coupled to sensitization enhancement component 600;

[0060] The fastener 100 and the sensitizing component 600 are fixedly connected to the fastener 100.

[0061] The first housing 200 has a first opening;

[0062] The second housing 300 covers the first opening along the first direction. The first housing 200 and the second housing 300 cooperate to form a receiving cavity, in which the sensitizing component 600 and the fixing member 100 are received.

[0063] The first housing 200 is provided with a first abutting part 201, and the second housing 300 is provided with a second abutting part 301. When the second housing 300 is closed to the first opening, the first abutting part 201 presses one side of the fixing member 100 along the first direction, and the second abutting part 301 presses the other side of the fixing member 100 along the first direction, so as to fix the fixing member 100 at the upper limit in the first direction.

[0064] This embodiment of the application uses a combination of a first housing 200, a second housing 300, and a fixing member 100. The housings (i.e., the first housing 200 and the second housing 300) cover each other to achieve positioning and fixation of the sensitizing component 600 along the first direction, reducing the number of parts and simplifying the overall structure. During assembly, only the sensitizing component 600 with the fixing member 100 needs to be placed into the first housing 200, and then the second housing 300 is placed on top. There is no need to use bolts to fix the sensitizing component 600, significantly improving the convenience of loading and unloading and assembly efficiency. The addition of the fixing member 100, and the limiting and fixing of the fixing member 100 along the first direction by the first abutment part 201 and the second abutment part 301, achieves the limiting of the fixing member 100 and the sensitizing component 600 along the first direction.

[0065] The sensitization component 600 is the "core sensitization unit" of the sensor, a key component for converting sound signals (vibration signals) into optical fiber detectable signals. It typically includes a frame 601 and a sensitization cylinder 602. The frame 601 provides support, and the sensitization material or structure of the sensitization cylinder 602 amplifies the minute deformations caused by external sound (vibration), enabling the optical fiber to more sensitively capture the signal (i.e., the "sensitization" effect). The space formed between the first abutment portion 201 and the second abutment portion 301 to accommodate the fixing member 100 can have an S-shaped, arc-shaped, C-shaped, or other shape. Its purpose is to fix the fixing member 100 in position along the first direction by compressing it.

[0066] In some embodiments, the fastener 100 can be a ring-shaped structure, which is sleeved and fixed on the sensitizing component 600. The structure is simple and easy to install and remove. The fastener 100 can also be a component of other structures, or a collection of multiple components, which are fixed on the sensitizing component 600 by means of sleeve, snap-fit, or plug-in.

[0067] In some preferred embodiments, the fixing member 100 is made of a vibration-damping material, so that the sensitizing component 600 is vibration-damped and fixedly disposed within the receiving cavity. The fixing member 100 can be made of rubber-based materials, such as nitrile rubber (NBR), silicone rubber (SR), fluororubber (FKM), neoprene rubber (CR), etc.; the fixing member 100 can also be made of elastic plastics or composite materials, etc. The vibration-damping material of the fixing member 100 can reduce the impact of the vibration of the first housing 200 and the second housing 300 on the sensitizing component 600 and the optical fiber, and can also achieve the positioning of the sensitizing component 600 along the first direction within the receiving cavity through the first abutment part 201 and the second abutment part 301, reducing loosening or displacement.

[0068] In addition, refer to Figure 2In some optional embodiments, the sensitizing component 600 is spaced apart from the inner wall of the first housing 200. This separation avoids direct contact and reduces the direct transmission of vibrations from the first housing 200 to the sensitizing component 600.

[0069] Regarding the implementation structure of the second abutment portion 301, in some alternative embodiments, refer to... Figure 2 and Figure 7 The second housing 300 is lid-shaped, and the inner surface of the second housing 300 forms the second abutment portion 301. The fixing member 100 is directly supported by the inner surface of the second housing 300 and the first abutment portion 201 is used to realize the positioning of the sensitive component 600 in the receiving cavity along the first direction. The structure is simple and the cost is low.

[0070] Regarding the implementation structure of the first abutment portion 201 and the second abutment portion 301, in some alternative embodiments, there are multiple first abutment portions 201, which are arranged at intervals around a first direction, and there are multiple second abutment portions 301, which are arranged at intervals around a first direction. Specifically, they can be protruding structures.

[0071] Of course, in some alternative embodiments, the first housing 200 may have a first annular groove with the first direction as the central axis, and the second housing 300 may have a second annular groove with the first direction as the central axis. When the second housing 300 covers the first opening of the first housing 200, the first annular groove and the second annular groove cooperate to form a third annular groove. The fixing member 100 is fixedly engaged with the third annular groove to fix the fixing member at the upper limit in the first direction. The first abutting part is the inner wall of the first annular groove, and the second abutting part is the inner wall of the second annular groove.

[0072] Specifically, such as Figure 2 and Figure 7 In the embodiments of the drawings in this application, the second abutment portion 301 is formed on the inner surface of the second housing 300. There are multiple first abutment portions 201, which are arranged at intervals around the first direction within the first housing 200 and located at the first opening.

[0073] For more details, please refer to Figure 8 and Figure 9 , Figure 8 A structural diagram of the first housing 200 provided in the embodiments of this application; Figure 9This is a structural diagram showing the sensor enhancement component 600 provided in this embodiment placed inside the first housing 200. In this embodiment, the first housing 200 is provided with five first abutment portions 201, and each first abutment portion 201 extends out of the first housing 200 and abuts against the fixing member 100 on the side of the fixing member 100 close to the first housing 200 in a first direction.

[0074] In some alternative implementations, refer to Figure 1 , Figure 2 , Figures 7-9 The second housing 300 is also provided with a plurality of limiting blocks 302. When the second housing 300 is closed to the first opening, the limiting blocks 302 abut against the fixing member 100, and the limiting blocks 302 limit and fix the fixing member 100 in a second direction perpendicular to the first direction.

[0075] refer to Figure 2 and Figure 7 In the embodiments shown in the accompanying drawings of this application, the fiber optic pickup sensor has a cylindrical structure, with the first direction referring to the axial direction and the second direction referring to the radial direction.

[0076] In some alternative implementations, refer to Figure 1 , Figure 2 , Figures 7-9 There are multiple limit blocks 302, and the multiple limit blocks 302 are arranged at intervals around the first direction with the first direction as the central axis.

[0077] In some alternative implementations, refer to Figure 1 , Figure 2 , Figures 7-9 The end cap of the second housing 300 is a protective cover 400, and the protective cover 400 is provided with a sound-permeable hole 500. The sensitizing component 600 has a sound cavity communicating with the sound-permeable hole 500 and / or the sensitizing component 600 cooperates with the first housing 200 and the second housing 300 to form a sound cavity communicating with the sound-permeable hole 500.

[0078] In the above technical solution, the sound-permeable hole 500 allows external sound waves to enter the receiving cavity and directly act on the sensitizing component 600 of the coupled optical fiber. The sensitizing component 600 has a sound cavity connected to the sound-permeable hole 500, which amplifies the sound effect and helps to further improve the sensitizing effect of the sensitizing component 600.

[0079] In this embodiment, a limiting block 302 is also provided inside the second housing 300. When the second housing 300 is closed to the first opening, the limiting block 302 abuts against the fixing member 100, and the limiting block 302 presses the fixing member 100 toward the central axis to limit and fix the fixing member 100 radially. Figure 7 In this embodiment, the six limiting blocks 302 press the fixing member 100 towards the center, preventing the fixing member 100 from... Figure 7 Move within the plane shown.

[0080] Please refer to Figure 3 , Figure 4 , Figure 5 and Figure 6 , Figure 3 This is a structural diagram of the sensitivity enhancement component 600 provided in an embodiment of this application; Figure 4 This is a structural diagram of the skeleton 601 provided in an embodiment of this application; Figure 5 This is a structural diagram of the sensitizing cylinder 602 provided in an embodiment of this application; Figure 6 This is a structural diagram of the fastener 100 provided in an embodiment of this application.

[0081] The sensitivity enhancement component 600 in this embodiment includes:

[0082] The skeleton 601 has an open end near the second shell 300 and a closed end away from the second shell 300.

[0083] The sensitivity enhancement cylinder 602 has an open structure at the top and bottom. The sensitivity enhancement cylinder 602 is sleeved on the frame 601, and the optical fiber is set on the sensitivity enhancement cylinder 602.

[0084] The frame 601 has a raised edge 6011 at one end near the second housing 300, and the fastener 100 is disposed on the raised edge 6011.

[0085] In some alternative embodiments, the frame 601 of the sensitizing component 600 can be integrally formed with the fixing member 100, reducing the number of parts. Furthermore, in order to reduce the impact of vibrations of the first housing 200 and the second housing 300 on the sensitizing cylinder 602, the frame 601 and the fixing member 100 can be integrally formed using a vibration-damping material to improve the vibration damping effect.

[0086] Of course, in some embodiments where the frame 601 and the fastener 100 are separate components, the frame 601 and / or the fastener 100 are made of vibration-damping material. The specific material can be selected and designed according to the requirements of vibration damping and stiffness.

[0087] In the above technical solution, the sensitivity enhancement component 600 is divided into a frame 601 and a sensitivity enhancement cylinder 602, making the functional division of the core components clearer: the frame 601 serves as the load-bearing foundation, providing stable support for the sensitivity enhancement cylinder 602; while the sensitivity enhancement cylinder 602 serves as the fiber optic coupling carrier. Coupling can be achieved by winding, and further, it can be fixed by dispensing adhesive, without any specific limitations.

[0088] In some alternative embodiments, the sidewalls 6012 of the skeleton 601 are hollowed out. The hollowed-out structure reduces the obstruction of sound waves by the skeleton 601, allowing external sound signals to be transmitted more smoothly to the sensitizing cylinder 602 of the sensitizing component 600 and the coupled optical fiber. The hollowed-out sidewalls 6012 reduce the amount of material used in the skeleton 601, achieving weight reduction while ensuring support strength.

[0089] In some alternative embodiments, the fastener 100 has a ring-shaped structure, and an annular groove 101 extending circumferentially along the inner periphery of the ring-shaped structure is provided. A protruding edge 6011 extends circumferentially in the skeleton 601 and is installed in the annular groove 101.

[0090] In some optional embodiments, at least three outlet holes are included; at least three first notches are distributed at different positions of the first opening of the first housing 200, and at least three second notches are distributed at different positions of the second opening of the second housing 300. Each first notch corresponds to a second notch. When the second housing 300 is closed on the first opening, each first notch and the corresponding second notch form a corresponding outlet hole.

[0091] The above technical solution provides three or more cable exit holes, facilitating flexible selection of cable exit positions. It should be noted that the fiber optic microphone sensor has two wiring positions, one inlet and one outlet. Since this embodiment has three or more cable exit holes, it is necessary to select two cable exit holes that are convenient for cable exit.

[0092] In some alternative implementations, at least three outlet holes include two first outlet holes and one second outlet hole; wherein one of the two first outlet holes is used for cable entry and the other for cable exit, and a plug is provided at the position of the second outlet hole.

[0093] In some optional embodiments, the first housing 200 has a first mounting hole on its side and the second housing 300 has a second mounting hole on its side. When the second housing 300 is closed to the first opening, the first mounting hole and the second mounting hole are fixedly connected one-to-one by fasteners.

[0094] In some alternative implementations, the fiber optic pickup sensor also includes vibration damping pads and a mounting bracket, the mounting bracket being connected to the first housing 200 via the vibration damping pads.

[0095] Specifically, there are two vibration damping pads, located opposite each other on the side of the first housing 200. The mounting bracket is connected to the first housing 200 through these two vibration damping pads, achieving a stable connection between the mounting bracket and the first housing 200. 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 through the vibration damping pads, so that the housing of the fiber optic pickup sensor is in a suspended state.

[0096] The fiber optic microphone can be attached to various support structures using a mounting bracket to test a variety of devices under test, such as:

[0097] The fiber optic microphone is mounted on the channel steel of the conveyor frame to detect the conveyor's operating status. Specifically, during installation, the sound transmission hole 500 of the fiber optic microphone should face downwards, and the mounting bracket is installed on the channel steel of the conveyor frame using vibration damping pads.

[0098] This embodiment forms a multi-stage vibration damping link: external equipment vibration—damping pad—fixed frame—damping pad—first housing 200—internal fixing component 100. The presence of the fixed frame eliminates the need for the sensor to be directly fixed to 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.

[0099] The vibration damping pads reduce the rigid impact and friction between the fixing frame and the first housing 200, and reduce the wear rate of the housing; at the same time, the multi-stage vibration damping avoids fatigue damage to the internal sensitizing component 600 and optical fiber caused by long-term strong vibration (such as optical fiber breakage and deformation of the sensitizing cylinder 602), and significantly extends the service life of the core components.

[0100] 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.

[0101] An embodiment of this application provides an optical fiber sensing system, comprising: one or more optical fiber pickup sensors as described above.

[0102] Specifically, the fiber optic sensing system may include a host device and a fiber optic microphone sensor, with the input and output lines of the fiber optic microphone sensor connected to the corresponding ports of the host device. When the device contains only one fiber optic microphone sensor, the sensor's input line (used to receive the detection light signal emitted by the host) and output line (used to transmit the light signal carrying the sound information back) are directly connected to the corresponding ports of the host device.

[0103] Fiber optic sensing systems can also include a host device and multiple fiber optic microphones, with the multiple microphones connected in series to the host device. When the device contains multiple fiber optic microphones, these sensors can be connected to the host device in series—that is, the output line of one sensor connects to the input line of the next, and finally the output line of the last sensor connects to the host device. This supports long-distance, multi-node distributed monitoring (such as simultaneous monitoring of multiple devices on a production line) without the need for additional signal amplification equipment, significantly reducing system complexity.

[0104] 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, and converting the optical path change (or phase and intensity change) caused by sound vibration into measurable optical signal changes through the optical fiber on the sensitization component 600; 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); and having data storage, display, or communication functions, which 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.

[0105] In the embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. Furthermore, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Additionally, the displayed or discussed mutual couplings, direct couplings, or communication connections may be through some communication interfaces; indirect couplings or communication connections between devices or units may be electrical, mechanical, or other forms.

[0106] Furthermore, the units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0107] Furthermore, the functional modules in the various embodiments of this application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0108] In this document, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, without necessarily requiring or implying any such actual relationship or order between these entities or operations.

[0109] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. An optical fiber pickup sensor, characterized by, include: optical fiber; A sensitivity enhancement component, wherein the optical fiber is coupled to the sensitivity enhancement component; The sensitizing component is fixedly connected to the fixing component; A first housing having a first opening; The second housing covers the first opening along the first direction, and the first housing and the second housing cooperate to form a receiving cavity, in which the sensitizing component and the fixing member are received; The first housing is provided with a first abutting part, and the second housing is provided with a second abutting part. When the second housing is closed on the first opening, the first abutting part presses against one side of the fixing member along the first direction, and the second abutting part presses against the other side of the fixing member along the first direction, so as to fix the fixing member in the upper limit in the first direction.

2. The fiber optic microphone sensor as described in claim 1, characterized in that, The second housing is also provided with a limiting block. When the second housing is closed on the first opening, the limiting block abuts against the fixing member, and the limiting block upper limit fixes the fixing member in a second direction perpendicular to the first direction.

3. The fiber optic acoustic sensor of claim 2, wherein, There are multiple limiting blocks, and the multiple limiting blocks are arranged at intervals around the first direction with the first direction as the central axis.

4. The fiber optic acoustic sensor of claim 1, wherein, The sensitivity enhancement component includes: The skeleton has an open end near the second shell and a closed end away from the second shell. A sensitivity-enhancing cylinder, wherein the sensitivity-enhancing cylinder has an open structure at the top and bottom, the sensitivity-enhancing cylinder is sleeved on the skeleton, and the optical fiber is disposed on the sensitivity-enhancing cylinder; The frame has a raised edge at one end near the second housing, and the fastener is disposed on the raised edge.

5. The fiber optic microphone sensor as described in claim 4, characterized in that, The sidewalls of the skeleton are hollowed out; and / or, The fastener has a ring-shaped structure, and an annular groove extending circumferentially along the inner periphery of the ring-shaped structure is formed therein. The protruding edge extends circumferentially in the skeleton and is installed in the annular groove; and / or, The frame is integrally formed with the fastener; and / or, The frame is made of vibration-damping material.

6. The fiber optic microphone sensor as described in claim 1, characterized in that, Includes at least three cable outlets; The first housing has at least three first notches distributed at different positions of the first opening, and the second housing has at least three second notches distributed at different positions of the second opening. Each first notch corresponds to one second notch. When the second housing is closed on the first opening, each first notch and the corresponding second notch form a corresponding outlet hole.

7. The fiber optic acoustic sensor of claim 6, wherein, The at least three cable outlets include two first cable outlets and one second cable outlet; wherein, one of the two first cable outlets is used for cable entry and the other for cable exit, and a plug is provided at the position of the second cable outlet.

8. The fiber optic acoustic sensor of claim 1, wherein, The second housing is provided with a sound-permeable hole, and the sensitizing component has a sound cavity communicating with the sound-permeable hole and / or the sensitizing component cooperates with the first housing and the second housing to form a sound cavity communicating with the sound-permeable hole; or, There are multiple first abutting portions, which are arranged at intervals around the first direction; there are also multiple second abutting portions, which are arranged at intervals around the first direction. or, The first housing has a first annular groove with the first direction as the central axis, and the second housing has a second annular groove with the first direction as the central axis. When the second housing is closed to the first opening, the first annular groove and the second annular groove cooperate to form a third annular groove. The fixing member is fixedly engaged with the third annular groove to fix the fixing member at the upper limit in the first direction. The first abutting part is the inner wall of the first annular groove, and the second abutting part is the inner wall of the second annular groove. Alternatively, the second housing may be in the form of a cover, with the second abutment portion formed on the inner surface of the second housing.

9. The fiber optic microphone sensor as described in claim 1, characterized in that, The first housing has a first mounting hole on its side, and the second housing has a second mounting hole on its side. When the second housing is closed over the first opening, the first mounting hole and the second mounting hole are fixedly connected one-to-one by fasteners; and / or, The fiber optic microphone sensor further includes vibration damping pads and a mounting bracket, the mounting bracket being connected to the first housing via the vibration damping pads; and / or, The sensitizing component is spaced apart from the inner wall of the first housing; and / or, The fastener is made of a vibration-damping material so that the sensitivity-enhancing component is fixedly installed in the receiving cavity with vibration damping.

10. An optical fiber sensing system, characterized by, Includes one or more fiber optic audio sensors as described in any one of claims 1-9.

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